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FFmpeg/libavutil/tx_template.c

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lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
/*
lavu/tx: refactor power-of-two FFT This commit refactors the power-of-two FFT, making it faster and halving the size of all tables, making the code much smaller on all systems. This removes the big/small pass split, because on modern systems the "big" pass is always faster, and even on older machines there is no measurable speed difference.
2021-04-10 03:47:18 +02:00
* Copyright (c) Lynne
*
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
* Power of two FFT:
lavu/tx: refactor power-of-two FFT This commit refactors the power-of-two FFT, making it faster and halving the size of all tables, making the code much smaller on all systems. This removes the big/small pass split, because on modern systems the "big" pass is always faster, and even on older machines there is no measurable speed difference.
2021-04-10 03:47:18 +02:00
* Copyright (c) Lynne
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
* Copyright (c) 2008 Loren Merritt
* Copyright (c) 2002 Fabrice Bellard
* Partly based on libdjbfft by D. J. Bernstein
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
avutil/common: Don't auto-include mem.h There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-25 02:30:37 +02:00
#include "mem.h"
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
#define TABLE_DEF(name, size) \
DECLARE_ALIGNED(32, TXSample, TX_TAB(ff_tx_tab_ ##name))[size]
avutil/tx_template: Avoid code duplication Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 14:56:50 +02:00
#define SR_POW2_TABLES \
SR_TABLE(8) \
SR_TABLE(16) \
SR_TABLE(32) \
SR_TABLE(64) \
SR_TABLE(128) \
SR_TABLE(256) \
SR_TABLE(512) \
SR_TABLE(1024) \
SR_TABLE(2048) \
SR_TABLE(4096) \
SR_TABLE(8192) \
SR_TABLE(16384) \
SR_TABLE(32768) \
SR_TABLE(65536) \
SR_TABLE(131072) \
avutil/tx_template: extend to 2M Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2023-05-30 02:59:11 +02:00
SR_TABLE(262144) \
SR_TABLE(524288) \
SR_TABLE(1048576) \
SR_TABLE(2097152) \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
avutil/tx_template: Avoid code duplication Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 14:56:50 +02:00
#define SR_TABLE(len) \
TABLE_DEF(len, len/4 + 1);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
/* Power of two tables */
avutil/tx_template: Avoid code duplication Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 14:56:50 +02:00
SR_POW2_TABLES
#undef SR_TABLE
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
/* Other factors' tables */
x86/tx_float: add 15xN PFA FFT AVX SIMD ~4x faster than the C version. The shuffles in the 15pt dim1 are seriously expensive. Not happy with it, but I'm contempt. Can be easily converted to pure AVX by removing all vpermpd/vpermps instructions.
2022-09-19 05:53:01 +02:00
TABLE_DEF(53, 12);
TABLE_DEF( 7, 6);
TABLE_DEF( 9, 8);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
avutil/tx_template: Move function pointers to const memory This can be achieved by moving the AVOnce out of the structure containing the function pointers; the latter can then be made const. This also has the advantage of eliminating padding in the structure (sizeof(AVOnce) is four here) and allowing the AVOnces to be put into .bss (dependening upon the implementation). Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 15:22:07 +02:00
typedef struct FFTabInitData {
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
void (*func)(void);
avutil/tx_template: Don't waste space for inexistent factors It is possible to avoid the factors array for the power-of-two tables for which said array is unused by using a different structure for initialization for power-of-two tables than for non-power-of-two-tables. This saves 3*15*16B from .data. Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 14:23:07 +02:00
int factors[TX_MAX_SUB]; /* Must be sorted high -> low */
avutil/tx_template: Move function pointers to const memory This can be achieved by moving the AVOnce out of the structure containing the function pointers; the latter can then be made const. This also has the advantage of eliminating padding in the structure (sizeof(AVOnce) is four here) and allowing the AVOnces to be put into .bss (dependening upon the implementation). Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 15:22:07 +02:00
} FFTabInitData;
avutil/tx_template: Don't waste space for inexistent factors It is possible to avoid the factors array for the power-of-two tables for which said array is unused by using a different structure for initialization for power-of-two tables than for non-power-of-two-tables. This saves 3*15*16B from .data. Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 14:23:07 +02:00
avutil/tx_template: Avoid code duplication Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 14:56:50 +02:00
#define SR_TABLE(len) \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
static av_cold void TX_TAB(ff_tx_init_tab_ ##len)(void) \
{ \
double freq = 2*M_PI/len; \
TXSample *tab = TX_TAB(ff_tx_tab_ ##len); \
\
for (int i = 0; i < len/4; i++) \
*tab++ = RESCALE(cos(i*freq)); \
\
*tab = 0; \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
}
avutil/tx_template: Avoid code duplication Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 14:56:50 +02:00
SR_POW2_TABLES
#undef SR_TABLE
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
avutil/tx_template: Move function pointers to const memory This can be achieved by moving the AVOnce out of the structure containing the function pointers; the latter can then be made const. This also has the advantage of eliminating padding in the structure (sizeof(AVOnce) is four here) and allowing the AVOnces to be put into .bss (dependening upon the implementation). Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 15:22:07 +02:00
static void (*const sr_tabs_init_funcs[])(void) = {
#define SR_TABLE(len) TX_TAB(ff_tx_init_tab_ ##len),
SR_POW2_TABLES
#undef SR_TABLE
};
static AVOnce sr_tabs_init_once[] = {
#define SR_TABLE(len) AV_ONCE_INIT,
avutil/tx_template: Avoid code duplication Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 14:56:50 +02:00
SR_POW2_TABLES
#undef SR_TABLE
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
};
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
x86/tx_float: add 15xN PFA FFT AVX SIMD ~4x faster than the C version. The shuffles in the 15pt dim1 are seriously expensive. Not happy with it, but I'm contempt. Can be easily converted to pure AVX by removing all vpermpd/vpermps instructions.
2022-09-19 05:53:01 +02:00
static av_cold void TX_TAB(ff_tx_init_tab_53)(void)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
{
x86/tx_float: add 15xN PFA FFT AVX SIMD ~4x faster than the C version. The shuffles in the 15pt dim1 are seriously expensive. Not happy with it, but I'm contempt. Can be easily converted to pure AVX by removing all vpermpd/vpermps instructions.
2022-09-19 05:53:01 +02:00
/* 5pt, doubled to eliminate AVX lane shuffles */
TX_TAB(ff_tx_tab_53)[0] = RESCALE(cos(2 * M_PI / 5));
TX_TAB(ff_tx_tab_53)[1] = RESCALE(cos(2 * M_PI / 5));
TX_TAB(ff_tx_tab_53)[2] = RESCALE(cos(2 * M_PI / 10));
TX_TAB(ff_tx_tab_53)[3] = RESCALE(cos(2 * M_PI / 10));
TX_TAB(ff_tx_tab_53)[4] = RESCALE(sin(2 * M_PI / 5));
TX_TAB(ff_tx_tab_53)[5] = RESCALE(sin(2 * M_PI / 5));
TX_TAB(ff_tx_tab_53)[6] = RESCALE(sin(2 * M_PI / 10));
TX_TAB(ff_tx_tab_53)[7] = RESCALE(sin(2 * M_PI / 10));
/* 3pt */
TX_TAB(ff_tx_tab_53)[ 8] = RESCALE(cos(2 * M_PI / 12));
TX_TAB(ff_tx_tab_53)[ 9] = RESCALE(cos(2 * M_PI / 12));
TX_TAB(ff_tx_tab_53)[10] = RESCALE(cos(2 * M_PI / 6));
TX_TAB(ff_tx_tab_53)[11] = RESCALE(cos(8 * M_PI / 6));
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
}
x86/tx_float: add 15xN PFA FFT AVX SIMD ~4x faster than the C version. The shuffles in the 15pt dim1 are seriously expensive. Not happy with it, but I'm contempt. Can be easily converted to pure AVX by removing all vpermpd/vpermps instructions.
2022-09-19 05:53:01 +02:00
static av_cold void TX_TAB(ff_tx_init_tab_7)(void)
lavu/tx: add a 7-point FFT and (i)MDCT
2021-04-10 03:51:59 +02:00
{
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
TX_TAB(ff_tx_tab_7)[0] = RESCALE(cos(2 * M_PI / 7));
TX_TAB(ff_tx_tab_7)[1] = RESCALE(sin(2 * M_PI / 7));
TX_TAB(ff_tx_tab_7)[2] = RESCALE(sin(2 * M_PI / 28));
TX_TAB(ff_tx_tab_7)[3] = RESCALE(cos(2 * M_PI / 28));
TX_TAB(ff_tx_tab_7)[4] = RESCALE(cos(2 * M_PI / 14));
TX_TAB(ff_tx_tab_7)[5] = RESCALE(sin(2 * M_PI / 14));
lavu/tx: add a 7-point FFT and (i)MDCT
2021-04-10 03:51:59 +02:00
}
x86/tx_float: add 15xN PFA FFT AVX SIMD ~4x faster than the C version. The shuffles in the 15pt dim1 are seriously expensive. Not happy with it, but I'm contempt. Can be easily converted to pure AVX by removing all vpermpd/vpermps instructions.
2022-09-19 05:53:01 +02:00
static av_cold void TX_TAB(ff_tx_init_tab_9)(void)
lavu/tx: add a 9-point FFT and (i)MDCT
2021-04-10 04:19:06 +02:00
{
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
TX_TAB(ff_tx_tab_9)[0] = RESCALE(cos(2 * M_PI / 3));
TX_TAB(ff_tx_tab_9)[1] = RESCALE(sin(2 * M_PI / 3));
TX_TAB(ff_tx_tab_9)[2] = RESCALE(cos(2 * M_PI / 9));
TX_TAB(ff_tx_tab_9)[3] = RESCALE(sin(2 * M_PI / 9));
TX_TAB(ff_tx_tab_9)[4] = RESCALE(cos(2 * M_PI / 36));
TX_TAB(ff_tx_tab_9)[5] = RESCALE(sin(2 * M_PI / 36));
TX_TAB(ff_tx_tab_9)[6] = TX_TAB(ff_tx_tab_9)[2] + TX_TAB(ff_tx_tab_9)[5];
TX_TAB(ff_tx_tab_9)[7] = TX_TAB(ff_tx_tab_9)[3] - TX_TAB(ff_tx_tab_9)[4];
lavu/tx: add a 9-point FFT and (i)MDCT
2021-04-10 04:19:06 +02:00
}
avutil/tx_template: Move function pointers to const memory This can be achieved by moving the AVOnce out of the structure containing the function pointers; the latter can then be made const. This also has the advantage of eliminating padding in the structure (sizeof(AVOnce) is four here) and allowing the AVOnces to be put into .bss (dependening upon the implementation). Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 15:22:07 +02:00
static const FFTabInitData nptwo_tabs_init_data[] = {
{ TX_TAB(ff_tx_init_tab_53), { 15, 5, 3 } },
{ TX_TAB(ff_tx_init_tab_9), { 9 } },
{ TX_TAB(ff_tx_init_tab_7), { 7 } },
};
static AVOnce nptwo_tabs_init_once[] = {
AV_ONCE_INIT,
AV_ONCE_INIT,
AV_ONCE_INIT,
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
};
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
av_cold void TX_TAB(ff_tx_init_tabs)(int len)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
{
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
int factor_2 = ff_ctz(len);
if (factor_2) {
int idx = factor_2 - 3;
for (int i = 0; i <= idx; i++)
avutil/tx_template: Move function pointers to const memory This can be achieved by moving the AVOnce out of the structure containing the function pointers; the latter can then be made const. This also has the advantage of eliminating padding in the structure (sizeof(AVOnce) is four here) and allowing the AVOnces to be put into .bss (dependening upon the implementation). Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 15:22:07 +02:00
ff_thread_once(&sr_tabs_init_once[i],
sr_tabs_init_funcs[i]);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
len >>= factor_2;
}
avutil/tx_template: Move function pointers to const memory This can be achieved by moving the AVOnce out of the structure containing the function pointers; the latter can then be made const. This also has the advantage of eliminating padding in the structure (sizeof(AVOnce) is four here) and allowing the AVOnces to be put into .bss (dependening upon the implementation). Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 15:22:07 +02:00
for (int i = 0; i < FF_ARRAY_ELEMS(nptwo_tabs_init_data); i++) {
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
int f, f_idx = 0;
if (len <= 1)
return;
avutil/tx_template: Move function pointers to const memory This can be achieved by moving the AVOnce out of the structure containing the function pointers; the latter can then be made const. This also has the advantage of eliminating padding in the structure (sizeof(AVOnce) is four here) and allowing the AVOnces to be put into .bss (dependening upon the implementation). Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 15:22:07 +02:00
while ((f = nptwo_tabs_init_data[i].factors[f_idx++])) {
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
if (f % len)
continue;
avutil/tx_template: Move function pointers to const memory This can be achieved by moving the AVOnce out of the structure containing the function pointers; the latter can then be made const. This also has the advantage of eliminating padding in the structure (sizeof(AVOnce) is four here) and allowing the AVOnces to be put into .bss (dependening upon the implementation). Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-10-22 15:22:07 +02:00
ff_thread_once(&nptwo_tabs_init_once[i],
nptwo_tabs_init_data[i].func);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
len /= f;
break;
}
}
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
static av_always_inline void fft3(TXComplex *out, TXComplex *in,
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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ptrdiff_t stride)
{
lavu/tx: make prime factor transforms truly in-place They all overwrote in[0] and then used it as a DC.
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TXComplex tmp[3];
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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const TXSample *tab = TX_TAB(ff_tx_tab_53);
lavu/tx: improve 3-point fixed precision There's just no reason not to when its so easy (albeit messy) and its also reducing the precision of all non-power-of-two transforms that use it.
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#ifdef TX_INT32
int64_t mtmp[4];
#endif
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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lavu/tx: make prime factor transforms truly in-place They all overwrote in[0] and then used it as a DC.
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tmp[0] = in[0];
BF(tmp[1].re, tmp[2].im, in[1].im, in[2].im);
BF(tmp[1].im, tmp[2].re, in[1].re, in[2].re);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: improve 3-point fixed precision There's just no reason not to when its so easy (albeit messy) and its also reducing the precision of all non-power-of-two transforms that use it.
2020-02-14 21:55:00 +02:00
#ifdef TX_INT32
avutil/tx_template: fix integer ovberflwo in fft3() Fixes: signed integer overflow: -1028966111 + -1314089526 cannot be represented in type 'int' Fixes: 63174/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5853273711837184 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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out[0*stride].re = (int64_t)tmp[0].re + tmp[2].re;
out[0*stride].im = (int64_t)tmp[0].im + tmp[2].im;
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mtmp[0] = (int64_t)tab[ 8] * tmp[1].re;
mtmp[1] = (int64_t)tab[ 9] * tmp[1].im;
mtmp[2] = (int64_t)tab[10] * tmp[2].re;
mtmp[3] = (int64_t)tab[10] * tmp[2].im;
out[1*stride].re = tmp[0].re - (mtmp[2] + mtmp[0] + 0x40000000 >> 31);
out[1*stride].im = tmp[0].im - (mtmp[3] - mtmp[1] + 0x40000000 >> 31);
out[2*stride].re = tmp[0].re - (mtmp[2] - mtmp[0] + 0x40000000 >> 31);
out[2*stride].im = tmp[0].im - (mtmp[3] + mtmp[1] + 0x40000000 >> 31);
lavu/tx: improve 3-point fixed precision There's just no reason not to when its so easy (albeit messy) and its also reducing the precision of all non-power-of-two transforms that use it.
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#else
avutil/tx_template: fix integer ovberflwo in fft3() Fixes: signed integer overflow: -1028966111 + -1314089526 cannot be represented in type 'int' Fixes: 63174/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5853273711837184 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Lynne <dev@lynne.ee> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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out[0*stride].re = tmp[0].re + tmp[2].re;
out[0*stride].im = tmp[0].im + tmp[2].im;
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tmp[1].re = tab[ 8] * tmp[1].re;
tmp[1].im = tab[ 9] * tmp[1].im;
tmp[2].re = tab[10] * tmp[2].re;
tmp[2].im = tab[10] * tmp[2].im;
out[1*stride].re = tmp[0].re - tmp[2].re + tmp[1].re;
out[1*stride].im = tmp[0].im - tmp[2].im - tmp[1].im;
out[2*stride].re = tmp[0].re - tmp[2].re - tmp[1].re;
out[2*stride].im = tmp[0].im - tmp[2].im + tmp[1].im;
lavu/tx: improve 3-point fixed precision There's just no reason not to when its so easy (albeit messy) and its also reducing the precision of all non-power-of-two transforms that use it.
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#endif
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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#define DECL_FFT5(NAME, D0, D1, D2, D3, D4) \
static av_always_inline void NAME(TXComplex *out, TXComplex *in, \
ptrdiff_t stride) \
{ \
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TXComplex dc, z0[4], t[6]; \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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const TXSample *tab = TX_TAB(ff_tx_tab_53); \
\
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dc = in[0]; \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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BF(t[1].im, t[0].re, in[1].re, in[4].re); \
BF(t[1].re, t[0].im, in[1].im, in[4].im); \
BF(t[3].im, t[2].re, in[2].re, in[3].re); \
BF(t[3].re, t[2].im, in[2].im, in[3].im); \
\
avutil/tx_template: Fix some signed integer overflows in DECL_FFT5() Fixes: signed integer overflow: -1364715454 + -1468954671 cannot be represented in type 'int' Fixes: 62093/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5538774254485504 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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out[D0*stride].re = dc.re + (TXUSample)t[0].re + t[2].re; \
out[D0*stride].im = dc.im + (TXUSample)t[0].im + t[2].im; \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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\
x86/tx_float: add 15xN PFA FFT AVX SIMD ~4x faster than the C version. The shuffles in the 15pt dim1 are seriously expensive. Not happy with it, but I'm contempt. Can be easily converted to pure AVX by removing all vpermpd/vpermps instructions.
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SMUL(t[4].re, t[0].re, tab[0], tab[2], t[2].re, t[0].re); \
SMUL(t[4].im, t[0].im, tab[0], tab[2], t[2].im, t[0].im); \
CMUL(t[5].re, t[1].re, tab[4], tab[6], t[3].re, t[1].re); \
CMUL(t[5].im, t[1].im, tab[4], tab[6], t[3].im, t[1].im); \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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\
BF(z0[0].re, z0[3].re, t[0].re, t[1].re); \
BF(z0[0].im, z0[3].im, t[0].im, t[1].im); \
BF(z0[2].re, z0[1].re, t[4].re, t[5].re); \
BF(z0[2].im, z0[1].im, t[4].im, t[5].im); \
\
avutil/tx_template: Fix some signed integer overflows in DECL_FFT5() Fixes: signed integer overflow: -1364715454 + -1468954671 cannot be represented in type 'int' Fixes: 62093/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5538774254485504 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2023-09-15 00:32:19 +02:00
out[D1*stride].re = dc.re + (TXUSample)z0[3].re; \
out[D1*stride].im = dc.im + (TXUSample)z0[0].im; \
out[D2*stride].re = dc.re + (TXUSample)z0[2].re; \
out[D2*stride].im = dc.im + (TXUSample)z0[1].im; \
out[D3*stride].re = dc.re + (TXUSample)z0[1].re; \
out[D3*stride].im = dc.im + (TXUSample)z0[2].im; \
out[D4*stride].re = dc.re + (TXUSample)z0[0].re; \
out[D4*stride].im = dc.im + (TXUSample)z0[3].im; \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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}
DECL_FFT5(fft5, 0, 1, 2, 3, 4)
DECL_FFT5(fft5_m1, 0, 6, 12, 3, 9)
DECL_FFT5(fft5_m2, 10, 1, 7, 13, 4)
DECL_FFT5(fft5_m3, 5, 11, 2, 8, 14)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static av_always_inline void fft7(TXComplex *out, TXComplex *in,
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ptrdiff_t stride)
{
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TXComplex dc, t[6], z[3];
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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const TXComplex *tab = (const TXComplex *)TX_TAB(ff_tx_tab_7);
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#ifdef TX_INT32
int64_t mtmp[12];
#endif
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dc = in[0];
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BF(t[1].re, t[0].re, in[1].re, in[6].re);
BF(t[1].im, t[0].im, in[1].im, in[6].im);
BF(t[3].re, t[2].re, in[2].re, in[5].re);
BF(t[3].im, t[2].im, in[2].im, in[5].im);
BF(t[5].re, t[4].re, in[3].re, in[4].re);
BF(t[5].im, t[4].im, in[3].im, in[4].im);
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out[0*stride].re = dc.re + t[0].re + t[2].re + t[4].re;
out[0*stride].im = dc.im + t[0].im + t[2].im + t[4].im;
lavu/tx: add a 7-point FFT and (i)MDCT
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#ifdef TX_INT32 /* NOTE: it's possible to do this with 16 mults but 72 adds */
mtmp[ 0] = ((int64_t)tab[0].re)*t[0].re - ((int64_t)tab[2].re)*t[4].re;
mtmp[ 1] = ((int64_t)tab[0].re)*t[4].re - ((int64_t)tab[1].re)*t[0].re;
mtmp[ 2] = ((int64_t)tab[0].re)*t[2].re - ((int64_t)tab[2].re)*t[0].re;
mtmp[ 3] = ((int64_t)tab[0].re)*t[0].im - ((int64_t)tab[1].re)*t[2].im;
mtmp[ 4] = ((int64_t)tab[0].re)*t[4].im - ((int64_t)tab[1].re)*t[0].im;
mtmp[ 5] = ((int64_t)tab[0].re)*t[2].im - ((int64_t)tab[2].re)*t[0].im;
mtmp[ 6] = ((int64_t)tab[2].im)*t[1].im + ((int64_t)tab[1].im)*t[5].im;
mtmp[ 7] = ((int64_t)tab[0].im)*t[5].im + ((int64_t)tab[2].im)*t[3].im;
mtmp[ 8] = ((int64_t)tab[2].im)*t[5].im + ((int64_t)tab[1].im)*t[3].im;
mtmp[ 9] = ((int64_t)tab[0].im)*t[1].re + ((int64_t)tab[1].im)*t[3].re;
mtmp[10] = ((int64_t)tab[2].im)*t[3].re + ((int64_t)tab[0].im)*t[5].re;
mtmp[11] = ((int64_t)tab[2].im)*t[1].re + ((int64_t)tab[1].im)*t[5].re;
z[0].re = (int32_t)(mtmp[ 0] - ((int64_t)tab[1].re)*t[2].re + 0x40000000 >> 31);
z[1].re = (int32_t)(mtmp[ 1] - ((int64_t)tab[2].re)*t[2].re + 0x40000000 >> 31);
z[2].re = (int32_t)(mtmp[ 2] - ((int64_t)tab[1].re)*t[4].re + 0x40000000 >> 31);
z[0].im = (int32_t)(mtmp[ 3] - ((int64_t)tab[2].re)*t[4].im + 0x40000000 >> 31);
z[1].im = (int32_t)(mtmp[ 4] - ((int64_t)tab[2].re)*t[2].im + 0x40000000 >> 31);
z[2].im = (int32_t)(mtmp[ 5] - ((int64_t)tab[1].re)*t[4].im + 0x40000000 >> 31);
t[0].re = (int32_t)(mtmp[ 6] - ((int64_t)tab[0].im)*t[3].im + 0x40000000 >> 31);
t[2].re = (int32_t)(mtmp[ 7] - ((int64_t)tab[1].im)*t[1].im + 0x40000000 >> 31);
t[4].re = (int32_t)(mtmp[ 8] + ((int64_t)tab[0].im)*t[1].im + 0x40000000 >> 31);
t[0].im = (int32_t)(mtmp[ 9] + ((int64_t)tab[2].im)*t[5].re + 0x40000000 >> 31);
t[2].im = (int32_t)(mtmp[10] - ((int64_t)tab[1].im)*t[1].re + 0x40000000 >> 31);
t[4].im = (int32_t)(mtmp[11] - ((int64_t)tab[0].im)*t[3].re + 0x40000000 >> 31);
#else
z[0].re = tab[0].re*t[0].re - tab[2].re*t[4].re - tab[1].re*t[2].re;
z[1].re = tab[0].re*t[4].re - tab[1].re*t[0].re - tab[2].re*t[2].re;
z[2].re = tab[0].re*t[2].re - tab[2].re*t[0].re - tab[1].re*t[4].re;
z[0].im = tab[0].re*t[0].im - tab[1].re*t[2].im - tab[2].re*t[4].im;
z[1].im = tab[0].re*t[4].im - tab[1].re*t[0].im - tab[2].re*t[2].im;
z[2].im = tab[0].re*t[2].im - tab[2].re*t[0].im - tab[1].re*t[4].im;
/* It's possible to do t[4].re and t[0].im with 2 multiplies only by
* multiplying the sum of all with the average of the twiddles */
t[0].re = tab[2].im*t[1].im + tab[1].im*t[5].im - tab[0].im*t[3].im;
t[2].re = tab[0].im*t[5].im + tab[2].im*t[3].im - tab[1].im*t[1].im;
t[4].re = tab[2].im*t[5].im + tab[1].im*t[3].im + tab[0].im*t[1].im;
t[0].im = tab[0].im*t[1].re + tab[1].im*t[3].re + tab[2].im*t[5].re;
t[2].im = tab[2].im*t[3].re + tab[0].im*t[5].re - tab[1].im*t[1].re;
t[4].im = tab[2].im*t[1].re + tab[1].im*t[5].re - tab[0].im*t[3].re;
#endif
BF(t[1].re, z[0].re, z[0].re, t[4].re);
BF(t[3].re, z[1].re, z[1].re, t[2].re);
BF(t[5].re, z[2].re, z[2].re, t[0].re);
BF(t[1].im, z[0].im, z[0].im, t[0].im);
BF(t[3].im, z[1].im, z[1].im, t[2].im);
BF(t[5].im, z[2].im, z[2].im, t[4].im);
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out[1*stride].re = dc.re + z[0].re;
out[1*stride].im = dc.im + t[1].im;
out[2*stride].re = dc.re + t[3].re;
out[2*stride].im = dc.im + z[1].im;
out[3*stride].re = dc.re + z[2].re;
out[3*stride].im = dc.im + t[5].im;
out[4*stride].re = dc.re + t[5].re;
out[4*stride].im = dc.im + z[2].im;
out[5*stride].re = dc.re + z[1].re;
out[5*stride].im = dc.im + t[3].im;
out[6*stride].re = dc.re + t[1].re;
out[6*stride].im = dc.im + z[0].im;
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}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static av_always_inline void fft9(TXComplex *out, TXComplex *in,
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ptrdiff_t stride)
{
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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const TXComplex *tab = (const TXComplex *)TX_TAB(ff_tx_tab_9);
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TXComplex dc, t[16], w[4], x[5], y[5], z[2];
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#ifdef TX_INT32
int64_t mtmp[12];
#endif
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dc = in[0];
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BF(t[1].re, t[0].re, in[1].re, in[8].re);
BF(t[1].im, t[0].im, in[1].im, in[8].im);
BF(t[3].re, t[2].re, in[2].re, in[7].re);
BF(t[3].im, t[2].im, in[2].im, in[7].im);
BF(t[5].re, t[4].re, in[3].re, in[6].re);
BF(t[5].im, t[4].im, in[3].im, in[6].im);
BF(t[7].re, t[6].re, in[4].re, in[5].re);
BF(t[7].im, t[6].im, in[4].im, in[5].im);
w[0].re = t[0].re - t[6].re;
w[0].im = t[0].im - t[6].im;
w[1].re = t[2].re - t[6].re;
w[1].im = t[2].im - t[6].im;
w[2].re = t[1].re - t[7].re;
w[2].im = t[1].im - t[7].im;
w[3].re = t[3].re + t[7].re;
w[3].im = t[3].im + t[7].im;
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z[0].re = dc.re + t[4].re;
z[0].im = dc.im + t[4].im;
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z[1].re = t[0].re + t[2].re + t[6].re;
z[1].im = t[0].im + t[2].im + t[6].im;
out[0*stride].re = z[0].re + z[1].re;
out[0*stride].im = z[0].im + z[1].im;
#ifdef TX_INT32
mtmp[0] = t[1].re - t[3].re + t[7].re;
mtmp[1] = t[1].im - t[3].im + t[7].im;
y[3].re = (int32_t)(((int64_t)tab[0].im)*mtmp[0] + 0x40000000 >> 31);
y[3].im = (int32_t)(((int64_t)tab[0].im)*mtmp[1] + 0x40000000 >> 31);
mtmp[0] = (int32_t)(((int64_t)tab[0].re)*z[1].re + 0x40000000 >> 31);
mtmp[1] = (int32_t)(((int64_t)tab[0].re)*z[1].im + 0x40000000 >> 31);
mtmp[2] = (int32_t)(((int64_t)tab[0].re)*t[4].re + 0x40000000 >> 31);
mtmp[3] = (int32_t)(((int64_t)tab[0].re)*t[4].im + 0x40000000 >> 31);
x[3].re = z[0].re + (int32_t)mtmp[0];
x[3].im = z[0].im + (int32_t)mtmp[1];
z[0].re = in[0].re + (int32_t)mtmp[2];
z[0].im = in[0].im + (int32_t)mtmp[3];
mtmp[0] = ((int64_t)tab[1].re)*w[0].re;
mtmp[1] = ((int64_t)tab[1].re)*w[0].im;
mtmp[2] = ((int64_t)tab[2].im)*w[0].re;
mtmp[3] = ((int64_t)tab[2].im)*w[0].im;
mtmp[4] = ((int64_t)tab[1].im)*w[2].re;
mtmp[5] = ((int64_t)tab[1].im)*w[2].im;
mtmp[6] = ((int64_t)tab[2].re)*w[2].re;
mtmp[7] = ((int64_t)tab[2].re)*w[2].im;
x[1].re = (int32_t)(mtmp[0] + ((int64_t)tab[2].im)*w[1].re + 0x40000000 >> 31);
x[1].im = (int32_t)(mtmp[1] + ((int64_t)tab[2].im)*w[1].im + 0x40000000 >> 31);
x[2].re = (int32_t)(mtmp[2] - ((int64_t)tab[3].re)*w[1].re + 0x40000000 >> 31);
x[2].im = (int32_t)(mtmp[3] - ((int64_t)tab[3].re)*w[1].im + 0x40000000 >> 31);
y[1].re = (int32_t)(mtmp[4] + ((int64_t)tab[2].re)*w[3].re + 0x40000000 >> 31);
y[1].im = (int32_t)(mtmp[5] + ((int64_t)tab[2].re)*w[3].im + 0x40000000 >> 31);
y[2].re = (int32_t)(mtmp[6] - ((int64_t)tab[3].im)*w[3].re + 0x40000000 >> 31);
y[2].im = (int32_t)(mtmp[7] - ((int64_t)tab[3].im)*w[3].im + 0x40000000 >> 31);
y[0].re = (int32_t)(((int64_t)tab[0].im)*t[5].re + 0x40000000 >> 31);
y[0].im = (int32_t)(((int64_t)tab[0].im)*t[5].im + 0x40000000 >> 31);
#else
y[3].re = tab[0].im*(t[1].re - t[3].re + t[7].re);
y[3].im = tab[0].im*(t[1].im - t[3].im + t[7].im);
x[3].re = z[0].re + tab[0].re*z[1].re;
x[3].im = z[0].im + tab[0].re*z[1].im;
lavu/tx: make prime factor transforms truly in-place They all overwrote in[0] and then used it as a DC.
2022-09-24 06:47:21 +02:00
z[0].re = dc.re + tab[0].re*t[4].re;
z[0].im = dc.im + tab[0].re*t[4].im;
lavu/tx: add a 9-point FFT and (i)MDCT
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x[1].re = tab[1].re*w[0].re + tab[2].im*w[1].re;
x[1].im = tab[1].re*w[0].im + tab[2].im*w[1].im;
x[2].re = tab[2].im*w[0].re - tab[3].re*w[1].re;
x[2].im = tab[2].im*w[0].im - tab[3].re*w[1].im;
y[1].re = tab[1].im*w[2].re + tab[2].re*w[3].re;
y[1].im = tab[1].im*w[2].im + tab[2].re*w[3].im;
y[2].re = tab[2].re*w[2].re - tab[3].im*w[3].re;
y[2].im = tab[2].re*w[2].im - tab[3].im*w[3].im;
y[0].re = tab[0].im*t[5].re;
y[0].im = tab[0].im*t[5].im;
#endif
x[4].re = x[1].re + x[2].re;
x[4].im = x[1].im + x[2].im;
y[4].re = y[1].re - y[2].re;
y[4].im = y[1].im - y[2].im;
x[1].re = z[0].re + x[1].re;
x[1].im = z[0].im + x[1].im;
y[1].re = y[0].re + y[1].re;
y[1].im = y[0].im + y[1].im;
x[2].re = z[0].re + x[2].re;
x[2].im = z[0].im + x[2].im;
y[2].re = y[2].re - y[0].re;
y[2].im = y[2].im - y[0].im;
x[4].re = z[0].re - x[4].re;
x[4].im = z[0].im - x[4].im;
y[4].re = y[0].re - y[4].re;
y[4].im = y[0].im - y[4].im;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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out[1*stride] = (TXComplex){ x[1].re + y[1].im, x[1].im - y[1].re };
out[2*stride] = (TXComplex){ x[2].re + y[2].im, x[2].im - y[2].re };
out[3*stride] = (TXComplex){ x[3].re + y[3].im, x[3].im - y[3].re };
out[4*stride] = (TXComplex){ x[4].re + y[4].im, x[4].im - y[4].re };
out[5*stride] = (TXComplex){ x[4].re - y[4].im, x[4].im + y[4].re };
out[6*stride] = (TXComplex){ x[3].re - y[3].im, x[3].im + y[3].re };
out[7*stride] = (TXComplex){ x[2].re - y[2].im, x[2].im + y[2].re };
out[8*stride] = (TXComplex){ x[1].re - y[1].im, x[1].im + y[1].re };
lavu/tx: add a 9-point FFT and (i)MDCT
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}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static av_always_inline void fft15(TXComplex *out, TXComplex *in,
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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ptrdiff_t stride)
{
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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TXComplex tmp[15];
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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for (int i = 0; i < 5; i++)
fft3(tmp + i, in + i*3, 5);
fft5_m1(out, tmp + 0, stride);
fft5_m2(out, tmp + 5, stride);
fft5_m3(out, tmp + 10, stride);
}
lavu/tx: list all odd-length FFT factors as regular codelets Allows them to be picked just like any other transform.
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static av_cold int TX_NAME(ff_tx_fft_factor_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
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int ret = 0;
lavu/tx: list all odd-length FFT factors as regular codelets Allows them to be picked just like any other transform.
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TX_TAB(ff_tx_init_tabs)(len);
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
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if (len == 15)
ret = ff_tx_gen_pfa_input_map(s, opts, 3, 5);
else if (flags & FF_TX_PRESHUFFLE)
ret = ff_tx_gen_default_map(s, opts);
lavu/tx: list all odd-length FFT factors as regular codelets Allows them to be picked just like any other transform.
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lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
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return ret;
lavu/tx: list all odd-length FFT factors as regular codelets Allows them to be picked just like any other transform.
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}
#define DECL_FACTOR_S(n) \
static void TX_NAME(ff_tx_fft##n)(AVTXContext *s, void *dst, \
void *src, ptrdiff_t stride) \
{ \
fft##n((TXComplex *)dst, (TXComplex *)src, stride / sizeof(TXComplex)); \
} \
static const FFTXCodelet TX_NAME(ff_tx_fft##n##_ns_def) = { \
.name = TX_NAME_STR("fft" #n "_ns"), \
.function = TX_NAME(ff_tx_fft##n), \
.type = TX_TYPE(FFT), \
.flags = AV_TX_INPLACE | FF_TX_OUT_OF_PLACE | \
AV_TX_UNALIGNED | FF_TX_PRESHUFFLE, \
.factors[0] = n, \
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 1, \
lavu/tx: list all odd-length FFT factors as regular codelets Allows them to be picked just like any other transform.
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.min_len = n, \
.max_len = n, \
.init = TX_NAME(ff_tx_fft_factor_init), \
.cpu_flags = FF_TX_CPU_FLAGS_ALL, \
.prio = FF_TX_PRIO_BASE, \
};
#define DECL_FACTOR_F(n) \
DECL_FACTOR_S(n) \
static const FFTXCodelet TX_NAME(ff_tx_fft##n##_fwd_def) = { \
.name = TX_NAME_STR("fft" #n "_fwd"), \
.function = TX_NAME(ff_tx_fft##n), \
.type = TX_TYPE(FFT), \
.flags = AV_TX_INPLACE | FF_TX_OUT_OF_PLACE | \
AV_TX_UNALIGNED | FF_TX_FORWARD_ONLY, \
.factors[0] = n, \
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 1, \
lavu/tx: list all odd-length FFT factors as regular codelets Allows them to be picked just like any other transform.
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.min_len = n, \
.max_len = n, \
.init = TX_NAME(ff_tx_fft_factor_init), \
.cpu_flags = FF_TX_CPU_FLAGS_ALL, \
.prio = FF_TX_PRIO_BASE, \
};
DECL_FACTOR_F(3)
DECL_FACTOR_F(5)
DECL_FACTOR_F(7)
DECL_FACTOR_F(9)
DECL_FACTOR_S(15)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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#define BUTTERFLIES(a0, a1, a2, a3) \
lavu/tx: refactor power-of-two FFT This commit refactors the power-of-two FFT, making it faster and halving the size of all tables, making the code much smaller on all systems. This removes the big/small pass split, because on modern systems the "big" pass is always faster, and even on older machines there is no measurable speed difference.
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do { \
r0=a0.re; \
i0=a0.im; \
r1=a1.re; \
i1=a1.im; \
BF(t3, t5, t5, t1); \
BF(a2.re, a0.re, r0, t5); \
BF(a3.im, a1.im, i1, t3); \
BF(t4, t6, t2, t6); \
BF(a3.re, a1.re, r1, t4); \
BF(a2.im, a0.im, i0, t6); \
} while (0)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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#define TRANSFORM(a0, a1, a2, a3, wre, wim) \
lavu/tx: refactor power-of-two FFT This commit refactors the power-of-two FFT, making it faster and halving the size of all tables, making the code much smaller on all systems. This removes the big/small pass split, because on modern systems the "big" pass is always faster, and even on older machines there is no measurable speed difference.
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do { \
CMUL(t1, t2, a2.re, a2.im, wre, -wim); \
CMUL(t5, t6, a3.re, a3.im, wre, wim); \
BUTTERFLIES(a0, a1, a2, a3); \
} while (0)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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/* z[0...8n-1], w[1...2n-1] */
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static inline void TX_NAME(ff_tx_fft_sr_combine)(TXComplex *z,
const TXSample *cos, int len)
lavu/tx: refactor power-of-two FFT This commit refactors the power-of-two FFT, making it faster and halving the size of all tables, making the code much smaller on all systems. This removes the big/small pass split, because on modern systems the "big" pass is always faster, and even on older machines there is no measurable speed difference.
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{
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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int o1 = 2*len;
int o2 = 4*len;
int o3 = 6*len;
const TXSample *wim = cos + o1 - 7;
avutil/tx: Use unsigned in ff_tx_fft_sr_combine() to avoid undefined behavior Fixes: signed integer overflow: -1284837070 - 982101618 cannot be represented in type 'int' Fixes: 53105/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AC3_FIXED_fuzzer-4848015827664896 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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TXUSample t1, t2, t3, t4, t5, t6, r0, i0, r1, i1;
lavu/tx: refactor power-of-two FFT This commit refactors the power-of-two FFT, making it faster and halving the size of all tables, making the code much smaller on all systems. This removes the big/small pass split, because on modern systems the "big" pass is always faster, and even on older machines there is no measurable speed difference.
2021-04-10 03:47:18 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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for (int i = 0; i < len; i += 4) {
lavu/tx: refactor power-of-two FFT This commit refactors the power-of-two FFT, making it faster and halving the size of all tables, making the code much smaller on all systems. This removes the big/small pass split, because on modern systems the "big" pass is always faster, and even on older machines there is no measurable speed difference.
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TRANSFORM(z[0], z[o1 + 0], z[o2 + 0], z[o3 + 0], cos[0], wim[7]);
TRANSFORM(z[2], z[o1 + 2], z[o2 + 2], z[o3 + 2], cos[2], wim[5]);
TRANSFORM(z[4], z[o1 + 4], z[o2 + 4], z[o3 + 4], cos[4], wim[3]);
TRANSFORM(z[6], z[o1 + 6], z[o2 + 6], z[o3 + 6], cos[6], wim[1]);
TRANSFORM(z[1], z[o1 + 1], z[o2 + 1], z[o3 + 1], cos[1], wim[6]);
TRANSFORM(z[3], z[o1 + 3], z[o2 + 3], z[o3 + 3], cos[3], wim[4]);
TRANSFORM(z[5], z[o1 + 5], z[o2 + 5], z[o3 + 5], cos[5], wim[2]);
TRANSFORM(z[7], z[o1 + 7], z[o2 + 7], z[o3 + 7], cos[7], wim[0]);
z += 2*4;
cos += 2*4;
wim -= 2*4;
}
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static av_cold int TX_NAME(ff_tx_fft_sr_codelet_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
TX_TAB(ff_tx_init_tabs)(len);
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
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return ff_tx_gen_ptwo_revtab(s, opts);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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#define DECL_SR_CODELET_DEF(n) \
static const FFTXCodelet TX_NAME(ff_tx_fft##n##_ns_def) = { \
.name = TX_NAME_STR("fft" #n "_ns"), \
.function = TX_NAME(ff_tx_fft##n##_ns), \
.type = TX_TYPE(FFT), \
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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.flags = FF_TX_OUT_OF_PLACE | AV_TX_INPLACE | \
AV_TX_UNALIGNED | FF_TX_PRESHUFFLE, \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.factors[0] = 2, \
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 1, \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.min_len = n, \
.max_len = n, \
.init = TX_NAME(ff_tx_fft_sr_codelet_init), \
.cpu_flags = FF_TX_CPU_FLAGS_ALL, \
.prio = FF_TX_PRIO_BASE, \
};
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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#define DECL_SR_CODELET(n, n2, n4) \
static void TX_NAME(ff_tx_fft##n##_ns)(AVTXContext *s, void *_dst, \
void *_src, ptrdiff_t stride) \
{ \
TXComplex *src = _src; \
TXComplex *dst = _dst; \
const TXSample *cos = TX_TAB(ff_tx_tab_##n); \
\
TX_NAME(ff_tx_fft##n2##_ns)(s, dst, src, stride); \
TX_NAME(ff_tx_fft##n4##_ns)(s, dst + n4*2, src + n4*2, stride); \
TX_NAME(ff_tx_fft##n4##_ns)(s, dst + n4*3, src + n4*3, stride); \
TX_NAME(ff_tx_fft_sr_combine)(dst, cos, n4 >> 1); \
} \
\
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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DECL_SR_CODELET_DEF(n)
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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static void TX_NAME(ff_tx_fft2_ns)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
lavu/tx: add 2-point FFT transform By itself, this allows 6-point, 10-point and 30-point transforms. When the 9-point transform is added it allows for 18-point FFT, and also for a 36-point MDCT (used by MP3).
2020-02-25 08:49:26 +02:00
{
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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TXComplex *src = _src;
TXComplex *dst = _dst;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
TXComplex tmp;
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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BF(tmp.re, dst[0].re, src[0].re, src[1].re);
BF(tmp.im, dst[0].im, src[0].im, src[1].im);
dst[1] = tmp;
lavu/tx: add 2-point FFT transform By itself, this allows 6-point, 10-point and 30-point transforms. When the 9-point transform is added it allows for 18-point FFT, and also for a 36-point MDCT (used by MP3).
2020-02-25 08:49:26 +02:00
}
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
2022-11-17 21:03:09 +02:00
static void TX_NAME(ff_tx_fft4_ns)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
{
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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TXComplex *src = _src;
TXComplex *dst = _dst;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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TXSample t1, t2, t3, t4, t5, t6, t7, t8;
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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BF(t3, t1, src[0].re, src[1].re);
BF(t8, t6, src[3].re, src[2].re);
BF(dst[2].re, dst[0].re, t1, t6);
BF(t4, t2, src[0].im, src[1].im);
BF(t7, t5, src[2].im, src[3].im);
BF(dst[3].im, dst[1].im, t4, t8);
BF(dst[3].re, dst[1].re, t3, t7);
BF(dst[2].im, dst[0].im, t2, t5);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
}
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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static void TX_NAME(ff_tx_fft8_ns)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
{
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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TXComplex *src = _src;
TXComplex *dst = _dst;
avutil/tx_template: Use more unsigned ints to avoid undefined overflows Fixes: signed integer overflow: 574590586 - -1875616554 cannot be represented in type 'int' Fixes: 53914/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5037125846564864 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-12-07 00:44:37 +02:00
TXUSample t1, t2, t3, t4, t5, t6, r0, i0, r1, i1;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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const TXSample cos = TX_TAB(ff_tx_tab_8)[1];
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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TX_NAME(ff_tx_fft4_ns)(s, dst, src, stride);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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BF(t1, dst[5].re, src[4].re, -src[5].re);
BF(t2, dst[5].im, src[4].im, -src[5].im);
BF(t5, dst[7].re, src[6].re, -src[7].re);
BF(t6, dst[7].im, src[6].im, -src[7].im);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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BUTTERFLIES(dst[0], dst[2], dst[4], dst[6]);
TRANSFORM(dst[1], dst[3], dst[5], dst[7], cos, cos);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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}
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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static void TX_NAME(ff_tx_fft16_ns)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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{
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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TXComplex *src = _src;
TXComplex *dst = _dst;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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const TXSample *cos = TX_TAB(ff_tx_tab_16);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
avutil/tx_template: Use more unsigned ints to avoid undefined overflows Fixes: signed integer overflow: 574590586 - -1875616554 cannot be represented in type 'int' Fixes: 53914/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5037125846564864 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-12-07 00:44:37 +02:00
TXUSample t1, t2, t3, t4, t5, t6, r0, i0, r1, i1;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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TXSample cos_16_1 = cos[1];
TXSample cos_16_2 = cos[2];
TXSample cos_16_3 = cos[3];
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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TX_NAME(ff_tx_fft8_ns)(s, dst + 0, src + 0, stride);
TX_NAME(ff_tx_fft4_ns)(s, dst + 8, src + 8, stride);
TX_NAME(ff_tx_fft4_ns)(s, dst + 12, src + 12, stride);
lavu/tx: refactor power-of-two FFT This commit refactors the power-of-two FFT, making it faster and halving the size of all tables, making the code much smaller on all systems. This removes the big/small pass split, because on modern systems the "big" pass is always faster, and even on older machines there is no measurable speed difference.
2021-04-10 03:47:18 +02:00
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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t1 = dst[ 8].re;
t2 = dst[ 8].im;
t5 = dst[12].re;
t6 = dst[12].im;
BUTTERFLIES(dst[0], dst[4], dst[8], dst[12]);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: make C ptwo transforms in+out of place We assume that _all_ in-place transforms can operate out of place, which isn't true, because the C ptwo transforms were always in-place (dst).
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TRANSFORM(dst[ 2], dst[ 6], dst[10], dst[14], cos_16_2, cos_16_2);
TRANSFORM(dst[ 1], dst[ 5], dst[ 9], dst[13], cos_16_1, cos_16_3);
TRANSFORM(dst[ 3], dst[ 7], dst[11], dst[15], cos_16_3, cos_16_1);
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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DECL_SR_CODELET_DEF(2)
DECL_SR_CODELET_DEF(4)
DECL_SR_CODELET_DEF(8)
DECL_SR_CODELET_DEF(16)
DECL_SR_CODELET(32,16,8)
DECL_SR_CODELET(64,32,16)
DECL_SR_CODELET(128,64,32)
DECL_SR_CODELET(256,128,64)
DECL_SR_CODELET(512,256,128)
DECL_SR_CODELET(1024,512,256)
DECL_SR_CODELET(2048,1024,512)
DECL_SR_CODELET(4096,2048,1024)
DECL_SR_CODELET(8192,4096,2048)
DECL_SR_CODELET(16384,8192,4096)
DECL_SR_CODELET(32768,16384,8192)
DECL_SR_CODELET(65536,32768,16384)
DECL_SR_CODELET(131072,65536,32768)
avutil/tx_template: extend to 2M Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2023-05-30 02:59:11 +02:00
DECL_SR_CODELET(262144,131072,65536)
DECL_SR_CODELET(524288,262144,131072)
DECL_SR_CODELET(1048576,524288,262144)
DECL_SR_CODELET(2097152,1048576,524288)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
2022-09-24 06:49:16 +02:00
static av_cold int TX_NAME(ff_tx_fft_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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{
int ret;
int is_inplace = !!(flags & AV_TX_INPLACE);
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
2022-11-19 01:47:45 +02:00
FFTXCodeletOptions sub_opts = {
.map_dir = is_inplace ? FF_TX_MAP_SCATTER : FF_TX_MAP_GATHER,
};
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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flags &= ~FF_TX_OUT_OF_PLACE; /* We want the subtransform to be */
flags |= AV_TX_INPLACE; /* in-place */
flags |= FF_TX_PRESHUFFLE; /* This function handles the permute step */
if ((ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, &sub_opts, len, inv, scale)))
return ret;
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
2022-09-24 06:49:16 +02:00
if (is_inplace && (ret = ff_tx_gen_inplace_map(s, len)))
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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return ret;
return 0;
}
lavu/tx: add fft_inplace_small transforms This is much faster than the loop.
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static av_cold int TX_NAME(ff_tx_fft_inplace_small_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
if (!(s->tmp = av_malloc(len*sizeof(*s->tmp))))
return AVERROR(ENOMEM);
flags &= ~AV_TX_INPLACE;
return TX_NAME(ff_tx_fft_init)(s, cd, flags, opts, len, inv, scale);
}
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
2022-09-24 06:49:16 +02:00
static void TX_NAME(ff_tx_fft)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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{
TXComplex *src = _src;
lavu/tx: add fft_inplace_small transforms This is much faster than the loop.
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TXComplex *dst1 = s->flags & AV_TX_INPLACE ? s->tmp : _dst;
TXComplex *dst2 = _dst;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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int *map = s->sub[0].map;
int len = s->len;
/* Compilers can't vectorize this anyway without assuming AVX2, which they
* generally don't, at least without -march=native -mtune=native */
for (int i = 0; i < len; i++)
lavu/tx: add fft_inplace_small transforms This is much faster than the loop.
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dst1[i] = src[map[i]];
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
lavu/tx: add fft_inplace_small transforms This is much faster than the loop.
2022-11-17 21:10:45 +02:00
s->fn[0](&s->sub[0], dst2, dst1, stride);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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}
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
2022-09-24 06:49:16 +02:00
static void TX_NAME(ff_tx_fft_inplace)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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{
lavu/tx: support out-of-place transforms in fft_inplace This makes testing easier, as a unified path can be used for in/out of place transforms.
2022-11-17 21:06:43 +02:00
TXComplex *src = _src;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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TXComplex *dst = _dst;
TXComplex tmp;
const int *map = s->sub->map;
const int *inplace_idx = s->map;
int src_idx, dst_idx;
src_idx = *inplace_idx++;
do {
lavu/tx: support out-of-place transforms in fft_inplace This makes testing easier, as a unified path can be used for in/out of place transforms.
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tmp = src[src_idx];
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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dst_idx = map[src_idx];
do {
lavu/tx: support out-of-place transforms in fft_inplace This makes testing easier, as a unified path can be used for in/out of place transforms.
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FFSWAP(TXComplex, tmp, src[dst_idx]);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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dst_idx = map[dst_idx];
} while (dst_idx != src_idx); /* Can be > as well, but was less predictable */
lavu/tx: support out-of-place transforms in fft_inplace This makes testing easier, as a unified path can be used for in/out of place transforms.
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src[dst_idx] = tmp;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
} while ((src_idx = *inplace_idx++));
lavu/tx: support out-of-place transforms in fft_inplace This makes testing easier, as a unified path can be used for in/out of place transforms.
2022-11-17 21:06:43 +02:00
s->fn[0](&s->sub[0], dst, src, stride);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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}
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
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static const FFTXCodelet TX_NAME(ff_tx_fft_def) = {
.name = TX_NAME_STR("fft"),
.function = TX_NAME(ff_tx_fft),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.type = TX_TYPE(FFT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE,
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
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.factors[0] = TX_FACTOR_ANY,
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 1,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
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.init = TX_NAME(ff_tx_fft_init),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
lavu/tx: add fft_inplace_small transforms This is much faster than the loop.
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static const FFTXCodelet TX_NAME(ff_tx_fft_inplace_small_def) = {
.name = TX_NAME_STR("fft_inplace_small"),
.function = TX_NAME(ff_tx_fft),
.type = TX_TYPE(FFT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE | AV_TX_INPLACE,
.factors[0] = TX_FACTOR_ANY,
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 1,
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.min_len = 2,
.max_len = 65536,
.init = TX_NAME(ff_tx_fft_inplace_small_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE - 256,
};
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
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static const FFTXCodelet TX_NAME(ff_tx_fft_inplace_def) = {
.name = TX_NAME_STR("fft_inplace"),
.function = TX_NAME(ff_tx_fft_inplace),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.type = TX_TYPE(FFT),
lavu/tx: support out-of-place transforms in fft_inplace This makes testing easier, as a unified path can be used for in/out of place transforms.
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.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE | AV_TX_INPLACE,
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
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.factors[0] = TX_FACTOR_ANY,
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 1,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
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.init = TX_NAME(ff_tx_fft_init),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.cpu_flags = FF_TX_CPU_FLAGS_ALL,
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.prio = FF_TX_PRIO_BASE - 512,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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};
lavu/tx: add naive_small FFT The same as naive but with precomputed tables. Makes it more useful for odd-factors we don't support yet.
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static av_cold int TX_NAME(ff_tx_fft_init_naive_small)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
const double phase = s->inv ? 2.0*M_PI/len : -2.0*M_PI/len;
if (!(s->exp = av_malloc(len*len*sizeof(*s->exp))))
return AVERROR(ENOMEM);
for (int i = 0; i < len; i++) {
for (int j = 0; j < len; j++) {
const double factor = phase*i*j;
s->exp[i*j] = (TXComplex){
RESCALE(cos(factor)),
RESCALE(sin(factor)),
};
}
}
return 0;
}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static void TX_NAME(ff_tx_fft_naive)(AVTXContext *s, void *_dst, void *_src,
ptrdiff_t stride)
{
TXComplex *src = _src;
TXComplex *dst = _dst;
const int n = s->len;
double phase = s->inv ? 2.0*M_PI/n : -2.0*M_PI/n;
lavu/tx: support output stride in naive transforms Allows them to be used in general PFAs.
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stride /= sizeof(*dst);
lavu/tx: add naive_small FFT The same as naive but with precomputed tables. Makes it more useful for odd-factors we don't support yet.
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for (int i = 0; i < n; i++) {
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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TXComplex tmp = { 0 };
lavu/tx: add naive_small FFT The same as naive but with precomputed tables. Makes it more useful for odd-factors we don't support yet.
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for (int j = 0; j < n; j++) {
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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const double factor = phase*i*j;
const TXComplex mult = {
RESCALE(cos(factor)),
RESCALE(sin(factor)),
};
TXComplex res;
CMUL3(res, src[j], mult);
tmp.re += res.re;
tmp.im += res.im;
}
lavu/tx: support output stride in naive transforms Allows them to be used in general PFAs.
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dst[i*stride] = tmp;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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}
}
lavu/tx: add naive_small FFT The same as naive but with precomputed tables. Makes it more useful for odd-factors we don't support yet.
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static void TX_NAME(ff_tx_fft_naive_small)(AVTXContext *s, void *_dst, void *_src,
ptrdiff_t stride)
{
TXComplex *src = _src;
TXComplex *dst = _dst;
const int n = s->len;
lavu/tx: support output stride in naive transforms Allows them to be used in general PFAs.
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stride /= sizeof(*dst);
lavu/tx: add naive_small FFT The same as naive but with precomputed tables. Makes it more useful for odd-factors we don't support yet.
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for (int i = 0; i < n; i++) {
TXComplex tmp = { 0 };
for (int j = 0; j < n; j++) {
TXComplex res;
const TXComplex mult = s->exp[i*j];
CMUL3(res, src[j], mult);
tmp.re += res.re;
tmp.im += res.im;
}
lavu/tx: support output stride in naive transforms Allows them to be used in general PFAs.
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dst[i*stride] = tmp;
lavu/tx: add naive_small FFT The same as naive but with precomputed tables. Makes it more useful for odd-factors we don't support yet.
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}
}
static const FFTXCodelet TX_NAME(ff_tx_fft_naive_small_def) = {
.name = TX_NAME_STR("fft_naive_small"),
.function = TX_NAME(ff_tx_fft_naive_small),
.type = TX_TYPE(FFT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE,
.factors[0] = TX_FACTOR_ANY,
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 1,
lavu/tx: add naive_small FFT The same as naive but with precomputed tables. Makes it more useful for odd-factors we don't support yet.
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.min_len = 2,
.max_len = 1024,
.init = TX_NAME(ff_tx_fft_init_naive_small),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_MIN/2,
};
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static const FFTXCodelet TX_NAME(ff_tx_fft_naive_def) = {
.name = TX_NAME_STR("fft_naive"),
.function = TX_NAME(ff_tx_fft_naive),
.type = TX_TYPE(FFT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE,
.factors[0] = TX_FACTOR_ANY,
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 1,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
.init = NULL,
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_MIN,
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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};
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static av_cold int TX_NAME(ff_tx_fft_pfa_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
lavu/tx: generalize PFA FFTs This commit permits any stacking of FFTs of any size.
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int ret, *tmp, ps = flags & FF_TX_PRESHUFFLE;
FFTXCodeletOptions sub_opts = { .map_dir = FF_TX_MAP_GATHER };
size_t extra_tmp_len = 0;
int len_list[TX_MAX_DECOMPOSITIONS];
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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lavu/tx: generalize PFA FFTs This commit permits any stacking of FFTs of any size.
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if ((ret = ff_tx_decompose_length(len_list, TX_TYPE(FFT), len, inv)) < 0)
return ret;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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lavu/tx: generalize PFA FFTs This commit permits any stacking of FFTs of any size.
2022-11-19 02:00:36 +02:00
/* Two iterations to test both orderings. */
for (int i = 0; i < ret; i++) {
int len1 = len_list[i];
int len2 = len / len1;
/* Our ptwo transforms don't support striding the output. */
if (len2 & (len2 - 1))
FFSWAP(int, len1, len2);
ff_tx_clear_ctx(s);
/* First transform */
sub_opts.map_dir = FF_TX_MAP_GATHER;
flags &= ~AV_TX_INPLACE;
flags |= FF_TX_OUT_OF_PLACE;
flags |= FF_TX_PRESHUFFLE; /* This function handles the permute step */
ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, &sub_opts,
len1, inv, scale);
if (ret == AVERROR(ENOMEM)) {
return ret;
} else if (ret < 0) { /* Try again without a preshuffle flag */
flags &= ~FF_TX_PRESHUFFLE;
ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, &sub_opts,
len1, inv, scale);
if (ret == AVERROR(ENOMEM))
return ret;
else if (ret < 0)
continue;
}
/* Second transform. */
sub_opts.map_dir = FF_TX_MAP_SCATTER;
flags |= FF_TX_PRESHUFFLE;
retry:
flags &= ~FF_TX_OUT_OF_PLACE;
flags |= AV_TX_INPLACE;
ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, &sub_opts,
len2, inv, scale);
if (ret == AVERROR(ENOMEM)) {
return ret;
} else if (ret < 0) { /* Try again with an out-of-place transform */
flags |= FF_TX_OUT_OF_PLACE;
flags &= ~AV_TX_INPLACE;
ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, &sub_opts,
len2, inv, scale);
if (ret == AVERROR(ENOMEM)) {
return ret;
} else if (ret < 0) {
if (flags & FF_TX_PRESHUFFLE) { /* Retry again without a preshuf flag */
flags &= ~FF_TX_PRESHUFFLE;
goto retry;
} else {
continue;
}
}
}
/* Success */
break;
}
/* If nothing was sucessful, error out */
if (ret < 0)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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return ret;
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
2022-11-19 01:47:45 +02:00
/* Generate PFA map */
if ((ret = ff_tx_gen_compound_mapping(s, opts, 0,
lavu/tx: generalize PFA FFTs This commit permits any stacking of FFTs of any size.
2022-11-19 02:00:36 +02:00
s->sub[0].len, s->sub[1].len)))
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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return ret;
if (!(s->tmp = av_malloc(len*sizeof(*s->tmp))))
return AVERROR(ENOMEM);
lavu/tx: generalize PFA FFTs This commit permits any stacking of FFTs of any size.
2022-11-19 02:00:36 +02:00
/* Flatten input map */
tmp = (int *)s->tmp;
for (int k = 0; k < len; k += s->sub[0].len) {
memcpy(tmp, &s->map[k], s->sub[0].len*sizeof(*tmp));
for (int i = 0; i < s->sub[0].len; i++)
s->map[k + i] = tmp[s->sub[0].map[i]];
}
/* Only allocate extra temporary memory if we need it */
if (!(s->sub[1].flags & AV_TX_INPLACE))
extra_tmp_len = len;
else if (!ps)
extra_tmp_len = s->sub[0].len;
if (extra_tmp_len && !(s->exp = av_malloc(extra_tmp_len*sizeof(*s->exp))))
return AVERROR(ENOMEM);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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return 0;
}
lavu/tx: generalize PFA FFTs This commit permits any stacking of FFTs of any size.
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static void TX_NAME(ff_tx_fft_pfa)(AVTXContext *s, void *_out,
void *_in, ptrdiff_t stride)
{
const int n = s->sub[0].len, m = s->sub[1].len, l = s->len;
const int *in_map = s->map, *out_map = in_map + l;
const int *sub_map = s->sub[1].map;
TXComplex *tmp1 = s->sub[1].flags & AV_TX_INPLACE ? s->tmp : s->exp;
TXComplex *in = _in, *out = _out;
stride /= sizeof(*out);
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++)
s->exp[j] = in[in_map[i*n + j]];
s->fn[0](&s->sub[0], &s->tmp[sub_map[i]], s->exp, m*sizeof(TXComplex));
}
for (int i = 0; i < n; i++)
s->fn[1](&s->sub[1], &tmp1[m*i], &s->tmp[m*i], sizeof(TXComplex));
for (int i = 0; i < l; i++)
out[i*stride] = tmp1[out_map[i]];
}
static void TX_NAME(ff_tx_fft_pfa_ns)(AVTXContext *s, void *_out,
void *_in, ptrdiff_t stride)
{
const int n = s->sub[0].len, m = s->sub[1].len, l = s->len;
const int *in_map = s->map, *out_map = in_map + l;
const int *sub_map = s->sub[1].map;
TXComplex *tmp1 = s->sub[1].flags & AV_TX_INPLACE ? s->tmp : s->exp;
TXComplex *in = _in, *out = _out;
stride /= sizeof(*out);
for (int i = 0; i < m; i++)
s->fn[0](&s->sub[0], &s->tmp[sub_map[i]], &in[i*n], m*sizeof(TXComplex));
for (int i = 0; i < n; i++)
s->fn[1](&s->sub[1], &tmp1[m*i], &s->tmp[m*i], sizeof(TXComplex));
for (int i = 0; i < l; i++)
out[i*stride] = tmp1[out_map[i]];
}
static const FFTXCodelet TX_NAME(ff_tx_fft_pfa_def) = {
.name = TX_NAME_STR("fft_pfa"),
.function = TX_NAME(ff_tx_fft_pfa),
.type = TX_TYPE(FFT),
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE | FF_TX_OUT_OF_PLACE,
.factors = { 7, 5, 3, 2, TX_FACTOR_ANY },
.nb_factors = 2,
.min_len = 2*3,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_fft_pfa_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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};
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: generalize PFA FFTs This commit permits any stacking of FFTs of any size.
2022-11-19 02:00:36 +02:00
static const FFTXCodelet TX_NAME(ff_tx_fft_pfa_ns_def) = {
.name = TX_NAME_STR("fft_pfa_ns"),
.function = TX_NAME(ff_tx_fft_pfa_ns),
.type = TX_TYPE(FFT),
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE | FF_TX_OUT_OF_PLACE |
FF_TX_PRESHUFFLE,
.factors = { 7, 5, 3, 2, TX_FACTOR_ANY },
.nb_factors = 2,
.min_len = 2*3,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_fft_pfa_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
static av_cold int TX_NAME(ff_tx_mdct_naive_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
{
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
s->scale_d = *((SCALE_TYPE *)scale);
s->scale_f = s->scale_d;
return 0;
}
static void TX_NAME(ff_tx_mdct_naive_fwd)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
{
TXSample *src = _src;
TXSample *dst = _dst;
double scale = s->scale_d;
int len = s->len;
const double phase = M_PI/(4.0*len);
lavu/tx: support in-place FFT transforms This commit adds support for in-place FFT transforms. Since our internal transforms were all in-place anyway, this only changes the permutation on the input. Unfortunately, research papers were of no help here. All focused on dry hardware implementations, where permutes are free, or on software implementations where binary bloat is of no concern so storing dozen times the transforms for each permutation and version is not considered bad practice. Still, for a pure C implementation, it's only around 28% slower than the multi-megabyte FFTW3 in unaligned mode. Unlike a closed permutation like with PFA, split-radix FFT bit-reversals contain multiple NOPs, multiple simple swaps, and a few chained swaps, so regular single-loop single-state permute loops were not possible. Instead, we filter out parts of the input indices which are redundant. This allows for a single branch, and with some clever AVX512 asm, could possibly be SIMD'd without refactoring. The inplace_idx array is guaranteed to never be larger than the revtab array, and in practice only requires around log2(len) entries. The power-of-two MDCTs can be done in-place as well. And it's possible to eliminate a copy in the compound MDCTs too, however it'll be slower than doing them out of place, and we'd need to dirty the input array.
2021-02-10 18:58:22 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
stride /= sizeof(*dst);
for (int i = 0; i < len; i++) {
double sum = 0.0;
for (int j = 0; j < len*2; j++) {
int a = (2*j + 1 + len) * (2*i + 1);
sum += UNSCALE(src[j]) * cos(a * phase);
}
dst[i*stride] = RESCALE(sum*scale);
}
}
lavu/tx: support in-place FFT transforms This commit adds support for in-place FFT transforms. Since our internal transforms were all in-place anyway, this only changes the permutation on the input. Unfortunately, research papers were of no help here. All focused on dry hardware implementations, where permutes are free, or on software implementations where binary bloat is of no concern so storing dozen times the transforms for each permutation and version is not considered bad practice. Still, for a pure C implementation, it's only around 28% slower than the multi-megabyte FFTW3 in unaligned mode. Unlike a closed permutation like with PFA, split-radix FFT bit-reversals contain multiple NOPs, multiple simple swaps, and a few chained swaps, so regular single-loop single-state permute loops were not possible. Instead, we filter out parts of the input indices which are redundant. This allows for a single branch, and with some clever AVX512 asm, could possibly be SIMD'd without refactoring. The inplace_idx array is guaranteed to never be larger than the revtab array, and in practice only requires around log2(len) entries. The power-of-two MDCTs can be done in-place as well. And it's possible to eliminate a copy in the compound MDCTs too, however it'll be slower than doing them out of place, and we'd need to dirty the input array.
2021-02-10 18:58:22 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
static void TX_NAME(ff_tx_mdct_naive_inv)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
{
TXSample *src = _src;
TXSample *dst = _dst;
double scale = s->scale_d;
int len = s->len >> 1;
int len2 = len*2;
const double phase = M_PI/(4.0*len2);
lavu/tx: support in-place FFT transforms This commit adds support for in-place FFT transforms. Since our internal transforms were all in-place anyway, this only changes the permutation on the input. Unfortunately, research papers were of no help here. All focused on dry hardware implementations, where permutes are free, or on software implementations where binary bloat is of no concern so storing dozen times the transforms for each permutation and version is not considered bad practice. Still, for a pure C implementation, it's only around 28% slower than the multi-megabyte FFTW3 in unaligned mode. Unlike a closed permutation like with PFA, split-radix FFT bit-reversals contain multiple NOPs, multiple simple swaps, and a few chained swaps, so regular single-loop single-state permute loops were not possible. Instead, we filter out parts of the input indices which are redundant. This allows for a single branch, and with some clever AVX512 asm, could possibly be SIMD'd without refactoring. The inplace_idx array is guaranteed to never be larger than the revtab array, and in practice only requires around log2(len) entries. The power-of-two MDCTs can be done in-place as well. And it's possible to eliminate a copy in the compound MDCTs too, however it'll be slower than doing them out of place, and we'd need to dirty the input array.
2021-02-10 18:58:22 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
stride /= sizeof(*src);
for (int i = 0; i < len; i++) {
double sum_d = 0.0;
double sum_u = 0.0;
double i_d = phase * (4*len - 2*i - 1);
double i_u = phase * (3*len2 + 2*i + 1);
for (int j = 0; j < len2; j++) {
double a = (2 * j + 1);
double a_d = cos(a * i_d);
double a_u = cos(a * i_u);
double val = UNSCALE(src[j*stride]);
sum_d += a_d * val;
sum_u += a_u * val;
}
dst[i + 0] = RESCALE( sum_d*scale);
dst[i + len] = RESCALE(-sum_u*scale);
lavu/tx: support in-place FFT transforms This commit adds support for in-place FFT transforms. Since our internal transforms were all in-place anyway, this only changes the permutation on the input. Unfortunately, research papers were of no help here. All focused on dry hardware implementations, where permutes are free, or on software implementations where binary bloat is of no concern so storing dozen times the transforms for each permutation and version is not considered bad practice. Still, for a pure C implementation, it's only around 28% slower than the multi-megabyte FFTW3 in unaligned mode. Unlike a closed permutation like with PFA, split-radix FFT bit-reversals contain multiple NOPs, multiple simple swaps, and a few chained swaps, so regular single-loop single-state permute loops were not possible. Instead, we filter out parts of the input indices which are redundant. This allows for a single branch, and with some clever AVX512 asm, could possibly be SIMD'd without refactoring. The inplace_idx array is guaranteed to never be larger than the revtab array, and in practice only requires around log2(len) entries. The power-of-two MDCTs can be done in-place as well. And it's possible to eliminate a copy in the compound MDCTs too, however it'll be slower than doing them out of place, and we'd need to dirty the input array.
2021-02-10 18:58:22 +02:00
}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
}
static const FFTXCodelet TX_NAME(ff_tx_mdct_naive_fwd_def) = {
.name = TX_NAME_STR("mdct_naive_fwd"),
.function = TX_NAME(ff_tx_mdct_naive_fwd),
.type = TX_TYPE(MDCT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE | FF_TX_FORWARD_ONLY,
.factors = { 2, TX_FACTOR_ANY }, /* MDCTs need an even length */
lavu/tx: allow codelets to specify a minimum number of matching factors
2022-10-01 12:21:28 +02:00
.nb_factors = 2,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_mdct_naive_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_MIN,
};
static const FFTXCodelet TX_NAME(ff_tx_mdct_naive_inv_def) = {
.name = TX_NAME_STR("mdct_naive_inv"),
.function = TX_NAME(ff_tx_mdct_naive_inv),
.type = TX_TYPE(MDCT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE | FF_TX_INVERSE_ONLY,
.factors = { 2, TX_FACTOR_ANY },
lavu/tx: allow codelets to specify a minimum number of matching factors
2022-10-01 12:21:28 +02:00
.nb_factors = 2,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_mdct_naive_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_MIN,
};
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
static av_cold int TX_NAME(ff_tx_mdct_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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{
int ret;
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
2022-11-19 01:47:45 +02:00
FFTXCodeletOptions sub_opts = {
.map_dir = !inv ? FF_TX_MAP_SCATTER : FF_TX_MAP_GATHER,
};
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
s->scale_d = *((SCALE_TYPE *)scale);
s->scale_f = s->scale_d;
lavu/tx: support in-place FFT transforms This commit adds support for in-place FFT transforms. Since our internal transforms were all in-place anyway, this only changes the permutation on the input. Unfortunately, research papers were of no help here. All focused on dry hardware implementations, where permutes are free, or on software implementations where binary bloat is of no concern so storing dozen times the transforms for each permutation and version is not considered bad practice. Still, for a pure C implementation, it's only around 28% slower than the multi-megabyte FFTW3 in unaligned mode. Unlike a closed permutation like with PFA, split-radix FFT bit-reversals contain multiple NOPs, multiple simple swaps, and a few chained swaps, so regular single-loop single-state permute loops were not possible. Instead, we filter out parts of the input indices which are redundant. This allows for a single branch, and with some clever AVX512 asm, could possibly be SIMD'd without refactoring. The inplace_idx array is guaranteed to never be larger than the revtab array, and in practice only requires around log2(len) entries. The power-of-two MDCTs can be done in-place as well. And it's possible to eliminate a copy in the compound MDCTs too, however it'll be slower than doing them out of place, and we'd need to dirty the input array.
2021-02-10 18:58:22 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
flags &= ~FF_TX_OUT_OF_PLACE; /* We want the subtransform to be */
flags |= AV_TX_INPLACE; /* in-place */
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
flags |= FF_TX_PRESHUFFLE; /* First try with an in-place transform */
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
if ((ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, &sub_opts, len >> 1,
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
inv, scale))) {
flags &= ~FF_TX_PRESHUFFLE; /* Now try with a generic FFT */
if ((ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, &sub_opts, len >> 1,
inv, scale)))
return ret;
}
lavu/tx: do not steal lookup tables of subcontexts in the iMDCT As it happens, some still need their contexts.
2022-09-22 08:25:52 +02:00
s->map = av_malloc((len >> 1)*sizeof(*s->map));
if (!s->map)
return AVERROR(ENOMEM);
/* If we need to preshuffle copy the map from the subcontext */
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
if (s->sub[0].flags & FF_TX_PRESHUFFLE) {
lavu/tx: do not steal lookup tables of subcontexts in the iMDCT As it happens, some still need their contexts.
2022-09-22 08:25:52 +02:00
memcpy(s->map, s->sub->map, (len >> 1)*sizeof(*s->map));
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
} else {
for (int i = 0; i < len >> 1; i++)
s->map[i] = i;
}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
if ((ret = TX_TAB(ff_tx_mdct_gen_exp)(s, inv ? s->map : NULL)))
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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return ret;
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
/* Saves a multiply in a hot path. */
if (inv)
for (int i = 0; i < (s->len >> 1); i++)
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
s->map[i] <<= 1;
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
return 0;
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
}
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
static void TX_NAME(ff_tx_mdct_fwd)(AVTXContext *s, void *_dst, void *_src,
ptrdiff_t stride)
lavu: support arbitrary-point FFTs and all even (i)MDCT transforms This patch adds support for arbitrary-point FFTs and all even MDCT transforms. Odd MDCTs are not supported yet as they're based on the DCT-II and DCT-III and they're very niche. With this we can now write tests.
2021-01-12 09:11:47 +02:00
{
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
TXSample *src = _src, *dst = _dst;
TXComplex *exp = s->exp, tmp, *z = _dst;
const int len2 = s->len >> 1;
const int len4 = s->len >> 2;
const int len3 = len2 * 3;
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
const int *sub_map = s->map;
lavu: support arbitrary-point FFTs and all even (i)MDCT transforms This patch adds support for arbitrary-point FFTs and all even MDCT transforms. Odd MDCTs are not supported yet as they're based on the DCT-II and DCT-III and they're very niche. With this we can now write tests.
2021-01-12 09:11:47 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
stride /= sizeof(*dst);
for (int i = 0; i < len2; i++) { /* Folding and pre-reindexing */
const int k = 2*i;
const int idx = sub_map[i];
if (k < len2) {
tmp.re = FOLD(-src[ len2 + k], src[1*len2 - 1 - k]);
tmp.im = FOLD(-src[ len3 + k], -src[1*len3 - 1 - k]);
} else {
tmp.re = FOLD(-src[ len2 + k], -src[5*len2 - 1 - k]);
tmp.im = FOLD( src[-len2 + k], -src[1*len3 - 1 - k]);
lavu: support arbitrary-point FFTs and all even (i)MDCT transforms This patch adds support for arbitrary-point FFTs and all even MDCT transforms. Odd MDCTs are not supported yet as they're based on the DCT-II and DCT-III and they're very niche. With this we can now write tests.
2021-01-12 09:11:47 +02:00
}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
CMUL(z[idx].im, z[idx].re, tmp.re, tmp.im, exp[i].re, exp[i].im);
}
s->fn[0](&s->sub[0], z, z, sizeof(TXComplex));
for (int i = 0; i < len4; i++) {
const int i0 = len4 + i, i1 = len4 - i - 1;
TXComplex src1 = { z[i1].re, z[i1].im };
TXComplex src0 = { z[i0].re, z[i0].im };
CMUL(dst[2*i1*stride + stride], dst[2*i0*stride], src0.re, src0.im,
exp[i0].im, exp[i0].re);
CMUL(dst[2*i0*stride + stride], dst[2*i1*stride], src1.re, src1.im,
exp[i1].im, exp[i1].re);
lavu: support arbitrary-point FFTs and all even (i)MDCT transforms This patch adds support for arbitrary-point FFTs and all even MDCT transforms. Odd MDCTs are not supported yet as they're based on the DCT-II and DCT-III and they're very niche. With this we can now write tests.
2021-01-12 09:11:47 +02:00
}
}
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
static void TX_NAME(ff_tx_mdct_inv)(AVTXContext *s, void *_dst, void *_src,
ptrdiff_t stride)
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
{
TXComplex *z = _dst, *exp = s->exp;
const TXSample *src = _src, *in1, *in2;
const int len2 = s->len >> 1;
const int len4 = s->len >> 2;
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
const int *sub_map = s->map;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
stride /= sizeof(*src);
in1 = src;
in2 = src + ((len2*2) - 1) * stride;
for (int i = 0; i < len2; i++) {
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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int k = sub_map[i];
TXComplex tmp = { in2[-k*stride], in1[k*stride] };
CMUL3(z[i], tmp, exp[i]);
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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}
s->fn[0](&s->sub[0], z, z, sizeof(TXComplex));
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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exp += len2;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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for (int i = 0; i < len4; i++) {
const int i0 = len4 + i, i1 = len4 - i - 1;
TXComplex src1 = { z[i1].im, z[i1].re };
TXComplex src0 = { z[i0].im, z[i0].re };
CMUL(z[i1].re, z[i0].im, src1.re, src1.im, exp[i1].im, exp[i1].re);
CMUL(z[i0].re, z[i1].im, src0.re, src0.im, exp[i0].im, exp[i0].re);
}
}
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
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static const FFTXCodelet TX_NAME(ff_tx_mdct_fwd_def) = {
.name = TX_NAME_STR("mdct_fwd"),
.function = TX_NAME(ff_tx_mdct_fwd),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.type = TX_TYPE(MDCT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE | FF_TX_FORWARD_ONLY,
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
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.factors = { 2, TX_FACTOR_ANY },
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 2,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
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.init = TX_NAME(ff_tx_mdct_init),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
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static const FFTXCodelet TX_NAME(ff_tx_mdct_inv_def) = {
.name = TX_NAME_STR("mdct_inv"),
.function = TX_NAME(ff_tx_mdct_inv),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.type = TX_TYPE(MDCT),
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE | FF_TX_INVERSE_ONLY,
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.factors = { 2, TX_FACTOR_ANY },
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.nb_factors = 2,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
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.init = TX_NAME(ff_tx_mdct_init),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
static av_cold int TX_NAME(ff_tx_mdct_inv_full_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
int ret;
s->scale_d = *((SCALE_TYPE *)scale);
s->scale_f = s->scale_d;
flags &= ~AV_TX_FULL_IMDCT;
if ((ret = ff_tx_init_subtx(s, TX_TYPE(MDCT), flags, NULL, len, 1, scale)))
return ret;
return 0;
}
static void TX_NAME(ff_tx_mdct_inv_full)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
{
int len = s->len << 1;
int len2 = len >> 1;
int len4 = len >> 2;
TXSample *dst = _dst;
s->fn[0](&s->sub[0], dst + len4, _src, stride);
stride /= sizeof(*dst);
for (int i = 0; i < len4; i++) {
dst[ i*stride] = -dst[(len2 - i - 1)*stride];
dst[(len - i - 1)*stride] = dst[(len2 + i + 0)*stride];
}
}
static const FFTXCodelet TX_NAME(ff_tx_mdct_inv_full_def) = {
.name = TX_NAME_STR("mdct_inv_full"),
.function = TX_NAME(ff_tx_mdct_inv_full),
.type = TX_TYPE(MDCT),
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE |
FF_TX_OUT_OF_PLACE | AV_TX_FULL_IMDCT,
.factors = { 2, TX_FACTOR_ANY },
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 2,
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_mdct_inv_full_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
static av_cold int TX_NAME(ff_tx_mdct_pfa_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
int ret, sub_len;
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
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FFTXCodeletOptions sub_opts = { .map_dir = FF_TX_MAP_SCATTER };
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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len >>= 1;
sub_len = len / cd->factors[0];
s->scale_d = *((SCALE_TYPE *)scale);
s->scale_f = s->scale_d;
flags &= ~FF_TX_OUT_OF_PLACE; /* We want the subtransform to be */
flags |= AV_TX_INPLACE; /* in-place */
flags |= FF_TX_PRESHUFFLE; /* This function handles the permute step */
if ((ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, &sub_opts,
sub_len, inv, scale)))
return ret;
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
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if ((ret = ff_tx_gen_compound_mapping(s, opts, s->inv, cd->factors[0], sub_len)))
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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return ret;
lavu/tx: refactor to explicitly track and convert lookup table order Necessary for generalizing PFAs.
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/* Our 15-point transform is also a compound one, so embed its input map */
if (cd->factors[0] == 15)
TX_EMBED_INPUT_PFA_MAP(s->map, len, 3, 5);
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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if ((ret = TX_TAB(ff_tx_mdct_gen_exp)(s, inv ? s->map : NULL)))
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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return ret;
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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/* Saves multiplies in loops. */
for (int i = 0; i < len; i++)
s->map[i] <<= 1;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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if (!(s->tmp = av_malloc(len*sizeof(*s->tmp))))
return AVERROR(ENOMEM);
TX_TAB(ff_tx_init_tabs)(len / sub_len);
return 0;
}
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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#define DECL_COMP_IMDCT(N) \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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static void TX_NAME(ff_tx_mdct_pfa_##N##xM_inv)(AVTXContext *s, void *_dst, \
void *_src, ptrdiff_t stride) \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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{ \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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TXComplex fft##N##in[N]; \
TXComplex *z = _dst, *exp = s->exp; \
const TXSample *src = _src, *in1, *in2; \
const int len4 = s->len >> 2; \
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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const int len2 = s->len >> 1; \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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const int m = s->sub->len; \
const int *in_map = s->map, *out_map = in_map + N*m; \
const int *sub_map = s->sub->map; \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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\
stride /= sizeof(*src); /* To convert it from bytes */ \
in1 = src; \
in2 = src + ((N*m*2) - 1) * stride; \
\
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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for (int i = 0; i < len2; i += N) { \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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for (int j = 0; j < N; j++) { \
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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const int k = in_map[j]; \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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TXComplex tmp = { in2[-k*stride], in1[k*stride] }; \
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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CMUL3(fft##N##in[j], tmp, exp[j]); \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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} \
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
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fft##N(s->tmp + *(sub_map++), fft##N##in, m); \
exp += N; \
in_map += N; \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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} \
\
for (int i = 0; i < N; i++) \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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s->fn[0](&s->sub[0], s->tmp + m*i, s->tmp + m*i, sizeof(TXComplex)); \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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\
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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for (int i = 0; i < len4; i++) { \
const int i0 = len4 + i, i1 = len4 - i - 1; \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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const int s0 = out_map[i0], s1 = out_map[i1]; \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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TXComplex src1 = { s->tmp[s1].im, s->tmp[s1].re }; \
TXComplex src0 = { s->tmp[s0].im, s->tmp[s0].re }; \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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\
CMUL(z[i1].re, z[i0].im, src1.re, src1.im, exp[i1].im, exp[i1].re); \
CMUL(z[i0].re, z[i1].im, src0.re, src0.im, exp[i0].im, exp[i0].re); \
} \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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} \
\
static const FFTXCodelet TX_NAME(ff_tx_mdct_pfa_##N##xM_inv_def) = { \
.name = TX_NAME_STR("mdct_pfa_" #N "xM_inv"), \
.function = TX_NAME(ff_tx_mdct_pfa_##N##xM_inv), \
.type = TX_TYPE(MDCT), \
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE | FF_TX_INVERSE_ONLY, \
.factors = { N, TX_FACTOR_ANY }, \
lavu/tx: allow codelets to specify a minimum number of matching factors
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.nb_factors = 2, \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
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.min_len = N*2, \
.max_len = TX_LEN_UNLIMITED, \
.init = TX_NAME(ff_tx_mdct_pfa_init), \
.cpu_flags = FF_TX_CPU_FLAGS_ALL, \
.prio = FF_TX_PRIO_BASE, \
};
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
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DECL_COMP_IMDCT(3)
DECL_COMP_IMDCT(5)
lavu/tx: add a 7-point FFT and (i)MDCT
2021-04-10 03:51:59 +02:00
DECL_COMP_IMDCT(7)
lavu/tx: add a 9-point FFT and (i)MDCT
2021-04-10 04:19:06 +02:00
DECL_COMP_IMDCT(9)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
DECL_COMP_IMDCT(15)
#define DECL_COMP_MDCT(N) \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
static void TX_NAME(ff_tx_mdct_pfa_##N##xM_fwd)(AVTXContext *s, void *_dst, \
void *_src, ptrdiff_t stride) \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
{ \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
TXComplex fft##N##in[N]; \
TXSample *src = _src, *dst = _dst; \
TXComplex *exp = s->exp, tmp; \
const int m = s->sub->len; \
const int len4 = N*m; \
const int len3 = len4 * 3; \
const int len8 = s->len >> 2; \
const int *in_map = s->map, *out_map = in_map + N*m; \
const int *sub_map = s->sub->map; \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
\
stride /= sizeof(*dst); \
\
for (int i = 0; i < m; i++) { /* Folding and pre-reindexing */ \
for (int j = 0; j < N; j++) { \
const int k = in_map[i*N + j]; \
if (k < len4) { \
lavu/tx: implement 32 bit fixed point FFT and MDCT Required minimal changes to the code so made sense to implement. FFT and MDCT tested, the output of both was properly rounded. Fun fact: the non-power-of-two fixed-point FFT and MDCT are the fastest ever non-power-of-two fixed-point FFT and MDCT written. This can replace the power of two integer MDCTs in aac and ac3 if the MIPS optimizations are ported across. Unfortunately the ac3 encoder uses a 16-bit fixed point forward transform, unlike the encoder which uses a 32bit inverse transform, so some modifications might be required there. The 3-point FFT is somewhat less accurate than it otherwise could be, having minor rounding errors with bigger transforms. However, this could be improved later, and the way its currently written is the way one would write assembly for it. Similar rounding errors can also be found throughout the power of two FFTs as well, though those are more difficult to correct. Despite this, the integer transforms are more than accurate enough.
2020-02-09 01:13:28 +02:00
tmp.re = FOLD(-src[ len4 + k], src[1*len4 - 1 - k]); \
tmp.im = FOLD(-src[ len3 + k], -src[1*len3 - 1 - k]); \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
} else { \
lavu/tx: implement 32 bit fixed point FFT and MDCT Required minimal changes to the code so made sense to implement. FFT and MDCT tested, the output of both was properly rounded. Fun fact: the non-power-of-two fixed-point FFT and MDCT are the fastest ever non-power-of-two fixed-point FFT and MDCT written. This can replace the power of two integer MDCTs in aac and ac3 if the MIPS optimizations are ported across. Unfortunately the ac3 encoder uses a 16-bit fixed point forward transform, unlike the encoder which uses a 32bit inverse transform, so some modifications might be required there. The 3-point FFT is somewhat less accurate than it otherwise could be, having minor rounding errors with bigger transforms. However, this could be improved later, and the way its currently written is the way one would write assembly for it. Similar rounding errors can also be found throughout the power of two FFTs as well, though those are more difficult to correct. Despite this, the integer transforms are more than accurate enough.
2020-02-09 01:13:28 +02:00
tmp.re = FOLD(-src[ len4 + k], -src[5*len4 - 1 - k]); \
tmp.im = FOLD( src[-len4 + k], -src[1*len3 - 1 - k]); \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
} \
CMUL(fft##N##in[j].im, fft##N##in[j].re, tmp.re, tmp.im, \
exp[k >> 1].re, exp[k >> 1].im); \
} \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
fft##N(s->tmp + sub_map[i], fft##N##in, m); \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
} \
\
for (int i = 0; i < N; i++) \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
s->fn[0](&s->sub[0], s->tmp + m*i, s->tmp + m*i, sizeof(TXComplex)); \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
\
for (int i = 0; i < len8; i++) { \
const int i0 = len8 + i, i1 = len8 - i - 1; \
const int s0 = out_map[i0], s1 = out_map[i1]; \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
TXComplex src1 = { s->tmp[s1].re, s->tmp[s1].im }; \
TXComplex src0 = { s->tmp[s0].re, s->tmp[s0].im }; \
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
\
CMUL(dst[2*i1*stride + stride], dst[2*i0*stride], src0.re, src0.im, \
exp[i0].im, exp[i0].re); \
CMUL(dst[2*i0*stride + stride], dst[2*i1*stride], src1.re, src1.im, \
exp[i1].im, exp[i1].re); \
} \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
} \
\
static const FFTXCodelet TX_NAME(ff_tx_mdct_pfa_##N##xM_fwd_def) = { \
.name = TX_NAME_STR("mdct_pfa_" #N "xM_fwd"), \
.function = TX_NAME(ff_tx_mdct_pfa_##N##xM_fwd), \
.type = TX_TYPE(MDCT), \
.flags = AV_TX_UNALIGNED | FF_TX_OUT_OF_PLACE | FF_TX_FORWARD_ONLY, \
.factors = { N, TX_FACTOR_ANY }, \
lavu/tx: allow codelets to specify a minimum number of matching factors
2022-10-01 12:21:28 +02:00
.nb_factors = 2, \
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
.min_len = N*2, \
.max_len = TX_LEN_UNLIMITED, \
.init = TX_NAME(ff_tx_mdct_pfa_init), \
.cpu_flags = FF_TX_CPU_FLAGS_ALL, \
.prio = FF_TX_PRIO_BASE, \
};
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
DECL_COMP_MDCT(3)
DECL_COMP_MDCT(5)
lavu/tx: add a 7-point FFT and (i)MDCT
2021-04-10 03:51:59 +02:00
DECL_COMP_MDCT(7)
lavu/tx: add a 9-point FFT and (i)MDCT
2021-04-10 04:19:06 +02:00
DECL_COMP_MDCT(9)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
DECL_COMP_MDCT(15)
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
static av_cold int TX_NAME(ff_tx_rdft_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
int ret;
double f, m;
TXSample *tab;
lavu/tx: fix scaling of R2R transforms Still slightly inaccurate, but it's good enough now.
2023-09-01 06:13:51 +02:00
uint64_t r2r = flags & AV_TX_REAL_TO_REAL;
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
int len4 = FFALIGN(len, 4) / 4;
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
s->scale_d = *((SCALE_TYPE *)scale);
s->scale_f = s->scale_d;
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
flags &= ~(AV_TX_REAL_TO_REAL | AV_TX_REAL_TO_IMAGINARY);
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
if ((ret = ff_tx_init_subtx(s, TX_TYPE(FFT), flags, NULL, len >> 1, inv, scale)))
return ret;
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
if (!(s->exp = av_mallocz((8 + 2*len4)*sizeof(*s->exp))))
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
return AVERROR(ENOMEM);
tab = (TXSample *)s->exp;
f = 2*M_PI/len;
m = (inv ? 2*s->scale_d : s->scale_d);
*tab++ = RESCALE((inv ? 0.5 : 1.0) * m);
lavu/tx: fix last coefficient scaling for R2C transforms This was a typo.
2022-11-19 15:16:30 +02:00
*tab++ = RESCALE(inv ? 0.5*m : 1.0*m);
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
*tab++ = RESCALE( m);
*tab++ = RESCALE(-m);
*tab++ = RESCALE( (0.5 - 0.0) * m);
lavu/tx: fix scaling of R2R transforms Still slightly inaccurate, but it's good enough now.
2023-09-01 06:13:51 +02:00
if (r2r)
*tab++ = 1 / s->scale_f;
else
*tab++ = RESCALE( (0.0 - 0.5) * m);
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
*tab++ = RESCALE( (0.5 - inv) * m);
*tab++ = RESCALE(-(0.5 - inv) * m);
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
for (int i = 0; i < len4; i++)
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
*tab++ = RESCALE(cos(i*f));
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
tab = ((TXSample *)s->exp) + len4 + 8;
for (int i = 0; i < len4; i++)
lavu/tx: improve rdft table generation precision slightly
2023-09-01 06:06:44 +02:00
*tab++ = RESCALE(cos(((len - i*4)/4.0)*f)) * (inv ? 1 : -1);
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
return 0;
}
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
#define DECL_RDFT(n, inv) \
static void TX_NAME(ff_tx_rdft_ ##n)(AVTXContext *s, void *_dst, \
void *_src, ptrdiff_t stride) \
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
{ \
const int len2 = s->len >> 1; \
const int len4 = s->len >> 2; \
const TXSample *fact = (void *)s->exp; \
const TXSample *tcos = fact + 8; \
const TXSample *tsin = tcos + len4; \
TXComplex *data = inv ? _src : _dst; \
TXComplex t[3]; \
\
if (!inv) \
s->fn[0](&s->sub[0], data, _src, sizeof(TXComplex)); \
else \
data[0].im = data[len2].re; \
\
/* The DC value's both components are real, but we need to change them \
* into complex values. Also, the middle of the array is special-cased. \
* These operations can be done before or after the loop. */ \
t[0].re = data[0].re; \
data[0].re = t[0].re + data[0].im; \
data[0].im = t[0].re - data[0].im; \
data[ 0].re = MULT(fact[0], data[ 0].re); \
data[ 0].im = MULT(fact[1], data[ 0].im); \
data[len4].re = MULT(fact[2], data[len4].re); \
data[len4].im = MULT(fact[3], data[len4].im); \
\
for (int i = 1; i < len4; i++) { \
/* Separate even and odd FFTs */ \
t[0].re = MULT(fact[4], (data[i].re + data[len2 - i].re)); \
t[0].im = MULT(fact[5], (data[i].im - data[len2 - i].im)); \
t[1].re = MULT(fact[6], (data[i].im + data[len2 - i].im)); \
t[1].im = MULT(fact[7], (data[i].re - data[len2 - i].re)); \
\
/* Apply twiddle factors to the odd FFT and add to the even FFT */ \
CMUL(t[2].re, t[2].im, t[1].re, t[1].im, tcos[i], tsin[i]); \
\
data[ i].re = t[0].re + t[2].re; \
data[ i].im = t[2].im - t[0].im; \
data[len2 - i].re = t[0].re - t[2].re; \
data[len2 - i].im = t[2].im + t[0].im; \
} \
\
if (inv) { \
s->fn[0](&s->sub[0], _dst, data, sizeof(TXComplex)); \
} else { \
/* Move [0].im to the last position, as convention requires */ \
data[len2].re = data[0].im; \
lavu/tx: zero-out imaginary of last coefficient in forward RDFTs We didn't do this, because it's zero anyway, but it prevents users from using uninitialized memory in calculations.
2022-12-03 21:16:19 +02:00
data[ 0].im = data[len2].im = 0; \
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
} \
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
} \
\
static const FFTXCodelet TX_NAME(ff_tx_rdft_ ##n## _def) = { \
.name = TX_NAME_STR("rdft_" #n), \
.function = TX_NAME(ff_tx_rdft_ ##n), \
.type = TX_TYPE(RDFT), \
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE | FF_TX_OUT_OF_PLACE | \
(inv ? FF_TX_INVERSE_ONLY : FF_TX_FORWARD_ONLY), \
.factors = { 4, TX_FACTOR_ANY }, \
.nb_factors = 2, \
.min_len = 4, \
.max_len = TX_LEN_UNLIMITED, \
.init = TX_NAME(ff_tx_rdft_init), \
.cpu_flags = FF_TX_CPU_FLAGS_ALL, \
.prio = FF_TX_PRIO_BASE, \
};
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
DECL_RDFT(r2c, 0)
DECL_RDFT(c2r, 1)
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
#define DECL_RDFT_HALF(n, mode, mod2) \
static void TX_NAME(ff_tx_rdft_ ##n)(AVTXContext *s, void *_dst, \
void *_src, ptrdiff_t stride) \
{ \
const int len = s->len; \
const int len2 = len >> 1; \
const int len4 = len >> 2; \
const int aligned_len4 = FFALIGN(len, 4)/4; \
const TXSample *fact = (void *)s->exp; \
const TXSample *tcos = fact + 8; \
const TXSample *tsin = tcos + aligned_len4; \
TXComplex *data = _dst; \
TXSample *out = _dst; /* Half-complex is forward-only */ \
TXSample tmp_dc; \
av_unused TXSample tmp_mid; \
TXSample tmp[4]; \
TXComplex sf, sl; \
\
s->fn[0](&s->sub[0], _dst, _src, sizeof(TXComplex)); \
\
tmp_dc = data[0].re; \
data[ 0].re = tmp_dc + data[0].im; \
tmp_dc = tmp_dc - data[0].im; \
\
data[ 0].re = MULT(fact[0], data[ 0].re); \
tmp_dc = MULT(fact[1], tmp_dc); \
data[len4].re = MULT(fact[2], data[len4].re); \
\
if (!mod2) { \
data[len4].im = MULT(fact[3], data[len4].im); \
} else { \
sf = data[len4]; \
sl = data[len4 + 1]; \
if (mode == AV_TX_REAL_TO_REAL) \
tmp[0] = MULT(fact[4], (sf.re + sl.re)); \
else \
tmp[0] = MULT(fact[5], (sf.im - sl.im)); \
tmp[1] = MULT(fact[6], (sf.im + sl.im)); \
tmp[2] = MULT(fact[7], (sf.re - sl.re)); \
\
if (mode == AV_TX_REAL_TO_REAL) { \
tmp[3] = tmp[1]*tcos[len4] - tmp[2]*tsin[len4]; \
tmp_mid = (tmp[0] - tmp[3]); \
} else { \
tmp[3] = tmp[1]*tsin[len4] + tmp[2]*tcos[len4]; \
tmp_mid = (tmp[0] + tmp[3]); \
} \
} \
\
/* NOTE: unrolling this breaks non-mod8 lengths */ \
for (int i = 1; i <= len4; i++) { \
TXSample tmp[4]; \
TXComplex sf = data[i]; \
TXComplex sl = data[len2 - i]; \
\
if (mode == AV_TX_REAL_TO_REAL) \
tmp[0] = MULT(fact[4], (sf.re + sl.re)); \
else \
tmp[0] = MULT(fact[5], (sf.im - sl.im)); \
\
tmp[1] = MULT(fact[6], (sf.im + sl.im)); \
tmp[2] = MULT(fact[7], (sf.re - sl.re)); \
\
if (mode == AV_TX_REAL_TO_REAL) { \
tmp[3] = tmp[1]*tcos[i] - tmp[2]*tsin[i]; \
out[i] = (tmp[0] + tmp[3]); \
out[len - i] = (tmp[0] - tmp[3]); \
} else { \
tmp[3] = tmp[1]*tsin[i] + tmp[2]*tcos[i]; \
out[i - 1] = (tmp[3] - tmp[0]); \
out[len - i - 1] = (tmp[0] + tmp[3]); \
} \
} \
\
for (int i = 1; i < (len4 + (mode == AV_TX_REAL_TO_IMAGINARY)); i++) \
out[len2 - i] = out[len - i]; \
\
if (mode == AV_TX_REAL_TO_REAL) { \
out[len2] = tmp_dc; \
if (mod2) \
lavu/tx: fix scaling of R2R transforms Still slightly inaccurate, but it's good enough now.
2023-09-01 06:13:51 +02:00
out[len4 + 1] = tmp_mid * fact[5]; \
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
} else if (mod2) { \
out[len4] = tmp_mid; \
} \
} \
\
static const FFTXCodelet TX_NAME(ff_tx_rdft_ ##n## _def) = { \
.name = TX_NAME_STR("rdft_" #n), \
.function = TX_NAME(ff_tx_rdft_ ##n), \
.type = TX_TYPE(RDFT), \
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE | mode | \
FF_TX_OUT_OF_PLACE | FF_TX_FORWARD_ONLY, \
.factors = { 2 + 2*(!mod2), TX_FACTOR_ANY }, \
.nb_factors = 2, \
.min_len = 2 + 2*(!mod2), \
.max_len = TX_LEN_UNLIMITED, \
.init = TX_NAME(ff_tx_rdft_init), \
.cpu_flags = FF_TX_CPU_FLAGS_ALL, \
.prio = FF_TX_PRIO_BASE, \
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
};
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
DECL_RDFT_HALF(r2r, AV_TX_REAL_TO_REAL, 0)
DECL_RDFT_HALF(r2r_mod2, AV_TX_REAL_TO_REAL, 1)
DECL_RDFT_HALF(r2i, AV_TX_REAL_TO_IMAGINARY, 0)
DECL_RDFT_HALF(r2i_mod2, AV_TX_REAL_TO_IMAGINARY, 1)
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
lavu/tx: add DCT-II implementation
2022-11-19 15:20:23 +02:00
static av_cold int TX_NAME(ff_tx_dct_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
int ret;
double freq;
TXSample *tab;
SCALE_TYPE rsc = *((SCALE_TYPE *)scale);
lavu/tx: add DCT-III implementation
2022-11-20 04:44:29 +02:00
if (inv) {
len *= 2;
s->len *= 2;
rsc *= 0.5;
}
lavu/tx: add DCT-II implementation
2022-11-19 15:20:23 +02:00
if ((ret = ff_tx_init_subtx(s, TX_TYPE(RDFT), flags, NULL, len, inv, &rsc)))
return ret;
s->exp = av_malloc((len/2)*3*sizeof(TXSample));
if (!s->exp)
return AVERROR(ENOMEM);
tab = (TXSample *)s->exp;
freq = M_PI/(len*2);
for (int i = 0; i < len; i++)
tab[i] = RESCALE(cos(i*freq)*(!inv + 1));
lavu/tx: add DCT-III implementation
2022-11-20 04:44:29 +02:00
if (inv) {
for (int i = 0; i < len/2; i++)
tab[len + i] = RESCALE(0.5 / sin((2*i + 1)*freq));
} else {
for (int i = 0; i < len/2; i++)
tab[len + i] = RESCALE(cos((len - 2*i - 1)*freq));
}
lavu/tx: add DCT-II implementation
2022-11-19 15:20:23 +02:00
return 0;
}
static void TX_NAME(ff_tx_dctII)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
{
TXSample *dst = _dst;
TXSample *src = _src;
const int len = s->len;
const int len2 = len >> 1;
const TXSample *exp = (void *)s->exp;
TXSample next;
#ifdef TX_INT32
int64_t tmp1, tmp2;
#else
TXSample tmp1, tmp2;
#endif
for (int i = 0; i < len2; i++) {
TXSample in1 = src[i];
TXSample in2 = src[len - i - 1];
TXSample s = exp[len + i];
#ifdef TX_INT32
tmp1 = in1 + in2;
tmp2 = in1 - in2;
tmp1 >>= 1;
tmp2 *= s;
tmp2 = (tmp2 + 0x40000000) >> 31;
#else
tmp1 = (in1 + in2)*0.5;
tmp2 = (in1 - in2)*s;
#endif
src[i] = tmp1 + tmp2;
src[len - i - 1] = tmp1 - tmp2;
}
s->fn[0](&s->sub[0], dst, src, sizeof(TXComplex));
next = dst[len];
for (int i = len - 2; i > 0; i -= 2) {
TXSample tmp;
CMUL(tmp, dst[i], exp[len - i], exp[i], dst[i + 0], dst[i + 1]);
dst[i + 1] = next;
next += tmp;
}
#ifdef TX_INT32
tmp1 = ((int64_t)exp[0]) * ((int64_t)dst[0]);
dst[0] = (tmp1 + 0x40000000) >> 31;
#else
dst[0] = exp[0] * dst[0];
#endif
dst[1] = next;
}
lavu/tx: add DCT-III implementation
2022-11-20 04:44:29 +02:00
static void TX_NAME(ff_tx_dctIII)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
{
TXSample *dst = _dst;
TXSample *src = _src;
const int len = s->len;
const int len2 = len >> 1;
const TXSample *exp = (void *)s->exp;
#ifdef TX_INT32
int64_t tmp1, tmp2 = src[len - 1];
tmp2 = (2*tmp2 + 0x40000000) >> 31;
#else
TXSample tmp1, tmp2 = 2*src[len - 1];
#endif
src[len] = tmp2;
for (int i = len - 2; i >= 2; i -= 2) {
TXSample val1 = src[i - 0];
TXSample val2 = src[i - 1] - src[i + 1];
CMUL(src[i + 1], src[i], exp[len - i], exp[i], val1, val2);
}
s->fn[0](&s->sub[0], dst, src, sizeof(float));
for (int i = 0; i < len2; i++) {
TXSample in1 = dst[i];
TXSample in2 = dst[len - i - 1];
TXSample c = exp[len + i];
tmp1 = in1 + in2;
tmp2 = in1 - in2;
tmp2 *= c;
#ifdef TX_INT32
tmp2 = (tmp2 + 0x40000000) >> 31;
#endif
dst[i] = tmp1 + tmp2;
dst[len - i - 1] = tmp1 - tmp2;
}
}
lavu/tx: add DCT-II implementation
2022-11-19 15:20:23 +02:00
static const FFTXCodelet TX_NAME(ff_tx_dctII_def) = {
.name = TX_NAME_STR("dctII"),
.function = TX_NAME(ff_tx_dctII),
.type = TX_TYPE(DCT),
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE |
FF_TX_OUT_OF_PLACE | FF_TX_FORWARD_ONLY,
.factors = { 2, TX_FACTOR_ANY },
.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_dct_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
lavu/tx: add DCT-III implementation
2022-11-20 04:44:29 +02:00
static const FFTXCodelet TX_NAME(ff_tx_dctIII_def) = {
.name = TX_NAME_STR("dctIII"),
.function = TX_NAME(ff_tx_dctIII),
.type = TX_TYPE(DCT),
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE |
FF_TX_OUT_OF_PLACE | FF_TX_INVERSE_ONLY,
.factors = { 2, TX_FACTOR_ANY },
.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_dct_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
lavu/tx: add DCT-I and DST-I transforms These are true, actual DCT-I and DST-I transforms, unlike the libavcodec versions, which are plainly not.
2023-08-03 18:23:02 +02:00
static av_cold int TX_NAME(ff_tx_dcstI_init)(AVTXContext *s,
const FFTXCodelet *cd,
uint64_t flags,
FFTXCodeletOptions *opts,
int len, int inv,
const void *scale)
{
int ret;
SCALE_TYPE rsc = *((SCALE_TYPE *)scale);
if (inv) {
len *= 2;
s->len *= 2;
rsc *= 0.5;
}
/* We want a half-complex RDFT */
flags |= cd->type == TX_TYPE(DCT_I) ? AV_TX_REAL_TO_REAL :
AV_TX_REAL_TO_IMAGINARY;
if ((ret = ff_tx_init_subtx(s, TX_TYPE(RDFT), flags, NULL,
(len - 1 + 2*(cd->type == TX_TYPE(DST_I)))*2,
0, &rsc)))
return ret;
s->tmp = av_mallocz((len + 1)*2*sizeof(TXSample));
if (!s->tmp)
return AVERROR(ENOMEM);
return 0;
}
static void TX_NAME(ff_tx_dctI)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
{
TXSample *dst = _dst;
TXSample *src = _src;
const int len = s->len - 1;
TXSample *tmp = (TXSample *)s->tmp;
stride /= sizeof(TXSample);
for (int i = 0; i < len; i++)
tmp[i] = tmp[2*len - i] = src[i * stride];
tmp[len] = src[len * stride]; /* Middle */
s->fn[0](&s->sub[0], dst, tmp, sizeof(TXSample));
}
static void TX_NAME(ff_tx_dstI)(AVTXContext *s, void *_dst,
void *_src, ptrdiff_t stride)
{
TXSample *dst = _dst;
TXSample *src = _src;
const int len = s->len + 1;
TXSample *tmp = (void *)s->tmp;
stride /= sizeof(TXSample);
tmp[0] = 0;
for (int i = 1; i < len; i++) {
TXSample a = src[(i - 1) * stride];
tmp[i] = -a;
tmp[2*len - i] = a;
}
tmp[len] = 0; /* i == n, Nyquist */
s->fn[0](&s->sub[0], dst, tmp, sizeof(float));
}
static const FFTXCodelet TX_NAME(ff_tx_dctI_def) = {
.name = TX_NAME_STR("dctI"),
.function = TX_NAME(ff_tx_dctI),
.type = TX_TYPE(DCT_I),
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE | FF_TX_OUT_OF_PLACE,
.factors = { 2, TX_FACTOR_ANY },
.nb_factors = 2,
.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_dcstI_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
static const FFTXCodelet TX_NAME(ff_tx_dstI_def) = {
.name = TX_NAME_STR("dstI"),
.function = TX_NAME(ff_tx_dstI),
.type = TX_TYPE(DST_I),
.flags = AV_TX_UNALIGNED | AV_TX_INPLACE | FF_TX_OUT_OF_PLACE,
.factors = { 2, TX_FACTOR_ANY },
.nb_factors = 2,
.min_len = 2,
.max_len = TX_LEN_UNLIMITED,
.init = TX_NAME(ff_tx_dcstI_init),
.cpu_flags = FF_TX_CPU_FLAGS_ALL,
.prio = FF_TX_PRIO_BASE,
};
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
int TX_TAB(ff_tx_mdct_gen_exp)(AVTXContext *s, int *pre_tab)
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
{
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
int off = 0;
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
int len4 = s->len >> 1;
double scale = s->scale_d;
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
const double theta = (scale < 0 ? len4 : 0) + 1.0/8.0;
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
size_t alloc = pre_tab ? 2*len4 : len4;
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
if (!(s->exp = av_malloc_array(alloc, sizeof(*s->exp))))
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
return AVERROR(ENOMEM);
scale = sqrt(fabs(scale));
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
if (pre_tab)
off = len4;
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
for (int i = 0; i < len4; i++) {
const double alpha = M_PI_2 * (i + theta) / len4;
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
s->exp[off + i] = (TXComplex){ RESCALE(cos(alpha) * scale),
RESCALE(sin(alpha) * scale) };
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
}
lavu/tx: optimize and simplify inverse MDCTs Convert the input from a scatter to a gather instead, which is faster and better for SIMD. Also, add a pre-shuffled exptab version to avoid gathering there at all. This doubles the exptab size, but the speedup makes it worth it. In SIMD, the exptab will likely be purged to a higher cache anyway because of the FFT in the middle, and the amount of loads stays identical. For a 960-point inverse MDCT, the speedup is 10%. This makes it possible to write sane and fast SIMD versions of inverse MDCTs.
2022-08-16 01:11:40 +02:00
if (pre_tab)
for (int i = 0; i < len4; i++)
s->exp[i] = s->exp[len4 + pre_tab[i]];
lavu/tx: add support for double precision FFT and MDCT Simply moves and templates the actual transforms to support an additional data type. Unlike the float version, which is equal or better than libfftw3f, double precision output is bit identical with libfftw3.
2019-07-27 19:54:20 +02:00
return 0;
}
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
const FFTXCodelet * const TX_NAME(ff_tx_codelet_list)[] = {
/* Split-Radix codelets */
&TX_NAME(ff_tx_fft2_ns_def),
&TX_NAME(ff_tx_fft4_ns_def),
&TX_NAME(ff_tx_fft8_ns_def),
&TX_NAME(ff_tx_fft16_ns_def),
&TX_NAME(ff_tx_fft32_ns_def),
&TX_NAME(ff_tx_fft64_ns_def),
&TX_NAME(ff_tx_fft128_ns_def),
&TX_NAME(ff_tx_fft256_ns_def),
&TX_NAME(ff_tx_fft512_ns_def),
&TX_NAME(ff_tx_fft1024_ns_def),
&TX_NAME(ff_tx_fft2048_ns_def),
&TX_NAME(ff_tx_fft4096_ns_def),
&TX_NAME(ff_tx_fft8192_ns_def),
&TX_NAME(ff_tx_fft16384_ns_def),
&TX_NAME(ff_tx_fft32768_ns_def),
&TX_NAME(ff_tx_fft65536_ns_def),
&TX_NAME(ff_tx_fft131072_ns_def),
avutil/tx_template: extend to 2M Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2023-05-30 02:59:11 +02:00
&TX_NAME(ff_tx_fft262144_ns_def),
&TX_NAME(ff_tx_fft524288_ns_def),
&TX_NAME(ff_tx_fft1048576_ns_def),
&TX_NAME(ff_tx_fft2097152_ns_def),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
lavu/tx: list all odd-length FFT factors as regular codelets Allows them to be picked just like any other transform.
2022-09-24 06:50:17 +02:00
/* Prime factor codelets */
&TX_NAME(ff_tx_fft3_ns_def),
&TX_NAME(ff_tx_fft5_ns_def),
&TX_NAME(ff_tx_fft7_ns_def),
&TX_NAME(ff_tx_fft9_ns_def),
&TX_NAME(ff_tx_fft15_ns_def),
/* We get these for free */
&TX_NAME(ff_tx_fft3_fwd_def),
&TX_NAME(ff_tx_fft5_fwd_def),
&TX_NAME(ff_tx_fft7_fwd_def),
&TX_NAME(ff_tx_fft9_fwd_def),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
/* Standalone transforms */
lavu/tx: generalize single-factor transforms Not that useful, but it gives us fast small odd-length transforms.
2022-09-24 06:49:16 +02:00
&TX_NAME(ff_tx_fft_def),
&TX_NAME(ff_tx_fft_inplace_def),
lavu/tx: add fft_inplace_small transforms This is much faster than the loop.
2022-11-17 21:10:45 +02:00
&TX_NAME(ff_tx_fft_inplace_small_def),
lavu/tx: generalize PFA FFTs This commit permits any stacking of FFTs of any size.
2022-11-19 02:00:36 +02:00
&TX_NAME(ff_tx_fft_pfa_def),
&TX_NAME(ff_tx_fft_pfa_ns_def),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
&TX_NAME(ff_tx_fft_naive_def),
lavu/tx: add naive_small FFT The same as naive but with precomputed tables. Makes it more useful for odd-factors we don't support yet.
2022-09-25 08:19:17 +02:00
&TX_NAME(ff_tx_fft_naive_small_def),
lavu/tx: generalize MDCTs The same code can perform any-length MDCTs with minimal changes.
2022-09-10 02:28:10 +02:00
&TX_NAME(ff_tx_mdct_fwd_def),
&TX_NAME(ff_tx_mdct_inv_def),
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
&TX_NAME(ff_tx_mdct_pfa_3xM_fwd_def),
&TX_NAME(ff_tx_mdct_pfa_5xM_fwd_def),
&TX_NAME(ff_tx_mdct_pfa_7xM_fwd_def),
&TX_NAME(ff_tx_mdct_pfa_9xM_fwd_def),
&TX_NAME(ff_tx_mdct_pfa_15xM_fwd_def),
&TX_NAME(ff_tx_mdct_pfa_3xM_inv_def),
&TX_NAME(ff_tx_mdct_pfa_5xM_inv_def),
&TX_NAME(ff_tx_mdct_pfa_7xM_inv_def),
&TX_NAME(ff_tx_mdct_pfa_9xM_inv_def),
&TX_NAME(ff_tx_mdct_pfa_15xM_inv_def),
&TX_NAME(ff_tx_mdct_naive_fwd_def),
&TX_NAME(ff_tx_mdct_naive_inv_def),
&TX_NAME(ff_tx_mdct_inv_full_def),
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
&TX_NAME(ff_tx_rdft_r2c_def),
lavu/tx: add real to real and real to imaginary RDFT transforms These are in-place transforms, required for DCT-I and DST-I. Templated as the mod2 variant requires minor modifications, and is required specifically for DCT-I/DST-I.
2023-08-03 18:21:23 +02:00
&TX_NAME(ff_tx_rdft_r2r_def),
&TX_NAME(ff_tx_rdft_r2r_mod2_def),
&TX_NAME(ff_tx_rdft_r2i_def),
&TX_NAME(ff_tx_rdft_r2i_mod2_def),
lavu/tx: add an RDFT implementation RDFTs are full of conventions that vary between implementations. What I've gone for here is what's most common between both fftw, avcodec's rdft and what we use, the equivalent of which is DFT_R2C for forward and IDFT_C2R for inverse. The other 2 conventions (IDFT_R2C and DFT_C2R) were not used at all in our code, and their names are also not appropriate. If there's a use for either, we can easily add a flag which would just flip the sign on one exptab. For some unknown reason, possibly to allow reusing FFT's exp tables, av_rdft's C2R output is 0.5x lower than what it should be to ensure a proper back-and-forth conversion. This code outputs its real samples at the correct level, which matches FFTW's level, and allows the user to change the level and insert arbitrary multiplies for free by setting the scale option.
2022-01-21 08:50:53 +02:00
&TX_NAME(ff_tx_rdft_c2r_def),
lavu/tx: add DCT-II implementation
2022-11-19 15:20:23 +02:00
&TX_NAME(ff_tx_dctII_def),
lavu/tx: add DCT-III implementation
2022-11-20 04:44:29 +02:00
&TX_NAME(ff_tx_dctIII_def),
lavu/tx: add DCT-I and DST-I transforms These are true, actual DCT-I and DST-I transforms, unlike the libavcodec versions, which are plainly not.
2023-08-03 18:23:02 +02:00
&TX_NAME(ff_tx_dctI_def),
&TX_NAME(ff_tx_dstI_def),
lavu: support arbitrary-point FFTs and all even (i)MDCT transforms This patch adds support for arbitrary-point FFTs and all even MDCT transforms. Odd MDCTs are not supported yet as they're based on the DCT-II and DCT-III and they're very niche. With this we can now write tests.
2021-01-12 09:11:47 +02:00
lavu/tx: rewrite internal code as a tree-based codelet constructor This commit rewrites the internal transform code into a constructor that stitches transforms (codelets). This allows for transforms to reuse arbitrary parts of other transforms, and allows transforms to be stacked onto one another (such as a full iMDCT using a half-iMDCT which in turn uses an FFT). It also permits for each step to be individually replaced by assembly or a custom implementation (such as an ASIC).
2022-01-20 08:14:46 +02:00
NULL,
};
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