mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
d9464f3e34
This avoids using dct.c and will allow removing it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
|
|
* Copyright (c) 2011 Mans Rullgard
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/thread.h"
|
|
#include "mpegaudio.h"
|
|
#include "mpegaudiodsp.h"
|
|
#include "dct32.h"
|
|
|
|
static AVOnce mpadsp_table_init = AV_ONCE_INIT;
|
|
|
|
static av_cold void mpadsp_init_tabs(void)
|
|
{
|
|
int i, j;
|
|
/* compute mdct windows */
|
|
for (i = 0; i < 36; i++) {
|
|
for (j = 0; j < 4; j++) {
|
|
double d;
|
|
|
|
if (j == 2 && i % 3 != 1)
|
|
continue;
|
|
|
|
d = sin(M_PI * (i + 0.5) / 36.0);
|
|
if (j == 1) {
|
|
if (i >= 30) d = 0;
|
|
else if (i >= 24) d = sin(M_PI * (i - 18 + 0.5) / 12.0);
|
|
else if (i >= 18) d = 1;
|
|
} else if (j == 3) {
|
|
if (i < 6) d = 0;
|
|
else if (i < 12) d = sin(M_PI * (i - 6 + 0.5) / 12.0);
|
|
else if (i < 18) d = 1;
|
|
}
|
|
//merge last stage of imdct into the window coefficients
|
|
d *= 0.5 * IMDCT_SCALAR / cos(M_PI * (2 * i + 19) / 72);
|
|
|
|
if (j == 2) {
|
|
ff_mdct_win_float[j][i/3] = d / (1 << 5);
|
|
ff_mdct_win_fixed[j][i/3] = d / (1 << 5) * (1LL << 32) + 0.5;
|
|
} else {
|
|
int idx = i < 18 ? i : i + (MDCT_BUF_SIZE/2 - 18);
|
|
ff_mdct_win_float[j][idx] = d / (1 << 5);
|
|
ff_mdct_win_fixed[j][idx] = d / (1 << 5) * (1LL << 32) + 0.5;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* NOTE: we do frequency inversion after the MDCT by changing
|
|
the sign of the right window coefs */
|
|
for (j = 0; j < 4; j++) {
|
|
for (i = 0; i < MDCT_BUF_SIZE; i += 2) {
|
|
ff_mdct_win_float[j + 4][i ] = ff_mdct_win_float[j][i ];
|
|
ff_mdct_win_float[j + 4][i + 1] = -ff_mdct_win_float[j][i + 1];
|
|
ff_mdct_win_fixed[j + 4][i ] = ff_mdct_win_fixed[j][i ];
|
|
ff_mdct_win_fixed[j + 4][i + 1] = -ff_mdct_win_fixed[j][i + 1];
|
|
}
|
|
}
|
|
|
|
#if ARCH_X86
|
|
ff_mpadsp_init_x86_tabs();
|
|
#endif
|
|
}
|
|
|
|
av_cold void ff_mpadsp_init(MPADSPContext *s)
|
|
{
|
|
ff_thread_once(&mpadsp_table_init, &mpadsp_init_tabs);
|
|
|
|
s->apply_window_float = ff_mpadsp_apply_window_float;
|
|
s->apply_window_fixed = ff_mpadsp_apply_window_fixed;
|
|
|
|
s->dct32_float = ff_dct32_float;
|
|
s->dct32_fixed = ff_dct32_fixed;
|
|
|
|
s->imdct36_blocks_float = ff_imdct36_blocks_float;
|
|
s->imdct36_blocks_fixed = ff_imdct36_blocks_fixed;
|
|
|
|
#if ARCH_AARCH64
|
|
ff_mpadsp_init_aarch64(s);
|
|
#elif ARCH_ARM
|
|
ff_mpadsp_init_arm(s);
|
|
#elif ARCH_PPC
|
|
ff_mpadsp_init_ppc(s);
|
|
#elif ARCH_X86
|
|
ff_mpadsp_init_x86(s);
|
|
#endif
|
|
#if HAVE_MIPSFPU
|
|
ff_mpadsp_init_mipsfpu(s);
|
|
#endif
|
|
#if HAVE_MIPSDSP
|
|
ff_mpadsp_init_mipsdsp(s);
|
|
#endif
|
|
}
|