2015-10-12 19:37:47 +02:00
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;******************************************************************************
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;* x86-SIMD-optimized IDCT for prores
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;* this is identical to "simple" IDCT written by Michael Niedermayer
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;* except for the clip range
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;*
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;* Copyright (c) 2011 Ronald S. Bultje <rsbultje@gmail.com>
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;* Copyright (c) 2015 Christophe Gisquet
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;*
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;* This file is part of FFmpeg.
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;*
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;* FFmpeg is free software; you can redistribute it and/or
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;* modify it under the terms of the GNU Lesser General Public
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;* License as published by the Free Software Foundation; either
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;* version 2.1 of the License, or (at your option) any later version.
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;*
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;* FFmpeg is distributed in the hope that it will be useful,
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;* but WITHOUT ANY WARRANTY; without even the implied warranty of
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;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;* Lesser General Public License for more details.
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;*
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;* You should have received a copy of the GNU Lesser General Public
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;* License along with FFmpeg; if not, write to the Free Software
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;* 51, Inc., Foundation Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;******************************************************************************
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%include "libavutil/x86/x86util.asm"
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%if ARCH_X86_64
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SECTION_RODATA
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x86: simple_idct: 12bits versions
On 12 frames of a 444p 12 bits DNxHR sequence, _put function:
C: 78902 decicycles in idct, 262071 runs, 73 skips
avx: 32478 decicycles in idct, 262045 runs, 99 skips
Difference between the 2:
stddev: 0.39 PSNR:104.47 MAXDIFF: 2
This is unavoidable and due to the scale factors used in the x86
version, which cannot match the C ones.
In addition, the trick of adding an initial bias to the input of a
pass can overflow, as the input coefficients are already 15bits,
which is the maximum this function can handle.
Overall, however, the omse on 12 bits samples goes from 0.16916 to
0.16883. Reducing rowshift by 1 improves to 0.0908, but causes
overflows.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2015-10-12 19:37:49 +02:00
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cextern pw_2
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2015-10-12 19:37:47 +02:00
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cextern pw_16
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cextern pw_1023
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x86: simple_idct: 12bits versions
On 12 frames of a 444p 12 bits DNxHR sequence, _put function:
C: 78902 decicycles in idct, 262071 runs, 73 skips
avx: 32478 decicycles in idct, 262045 runs, 99 skips
Difference between the 2:
stddev: 0.39 PSNR:104.47 MAXDIFF: 2
This is unavoidable and due to the scale factors used in the x86
version, which cannot match the C ones.
In addition, the trick of adding an initial bias to the input of a
pass can overflow, as the input coefficients are already 15bits,
which is the maximum this function can handle.
Overall, however, the omse on 12 bits samples goes from 0.16916 to
0.16883. Reducing rowshift by 1 improves to 0.0908, but causes
overflows.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2015-10-12 19:37:49 +02:00
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cextern pw_4095
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2015-10-12 19:37:47 +02:00
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pd_round_12: times 4 dd 1<<(12-1)
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x86: simple_idct: 12bits versions
On 12 frames of a 444p 12 bits DNxHR sequence, _put function:
C: 78902 decicycles in idct, 262071 runs, 73 skips
avx: 32478 decicycles in idct, 262045 runs, 99 skips
Difference between the 2:
stddev: 0.39 PSNR:104.47 MAXDIFF: 2
This is unavoidable and due to the scale factors used in the x86
version, which cannot match the C ones.
In addition, the trick of adding an initial bias to the input of a
pass can overflow, as the input coefficients are already 15bits,
which is the maximum this function can handle.
Overall, however, the omse on 12 bits samples goes from 0.16916 to
0.16883. Reducing rowshift by 1 improves to 0.0908, but causes
overflows.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2015-10-12 19:37:49 +02:00
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pd_round_15: times 4 dd 1<<(15-1)
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2015-10-12 19:37:47 +02:00
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pd_round_19: times 4 dd 1<<(19-1)
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2015-10-13 21:21:39 +02:00
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%macro CONST_DEC 3
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const %1
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times 4 dw %2, %3
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%endmacro
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%define W1sh2 22725 ; W1 = 90901 = 22725<<2 + 1
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%define W2sh2 21407 ; W2 = 85627 = 21407<<2 - 1
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%define W3sh2 19265 ; W3 = 77062 = 19265<<2 + 2
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%define W4sh2 16384 ; W4 = 65535 = 16384<<2 - 1
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%define W5sh2 12873 ; W5 = 51491 = 12873<<2 - 1
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%define W6sh2 8867 ; W6 = 35468 = 8867<<2
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%define W7sh2 4520 ; W7 = 18081 = 4520<<2 + 1
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CONST_DEC w4_plus_w2, W4sh2, +W2sh2
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CONST_DEC w4_min_w2, W4sh2, -W2sh2
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CONST_DEC w4_plus_w6, W4sh2, +W6sh2
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CONST_DEC w4_min_w6, W4sh2, -W6sh2
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CONST_DEC w1_plus_w3, W1sh2, +W3sh2
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CONST_DEC w3_min_w1, W3sh2, -W1sh2
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CONST_DEC w7_plus_w3, W7sh2, +W3sh2
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CONST_DEC w3_min_w7, W3sh2, -W7sh2
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CONST_DEC w1_plus_w5, W1sh2, +W5sh2
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CONST_DEC w5_min_w1, W5sh2, -W1sh2
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CONST_DEC w5_plus_w7, W5sh2, +W7sh2
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CONST_DEC w7_min_w5, W7sh2, -W5sh2
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2015-10-12 19:37:47 +02:00
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%include "libavcodec/x86/simple_idct10_template.asm"
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section .text align=16
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%macro idct_fn 0
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cglobal simple_idct10, 1, 1, 16
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IDCT_FN "", 12, "", 19
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RET
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cglobal simple_idct10_put, 3, 3, 16
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IDCT_FN "", 12, "", 19, 0, pw_1023
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RET
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x86: simple_idct: 12bits versions
On 12 frames of a 444p 12 bits DNxHR sequence, _put function:
C: 78902 decicycles in idct, 262071 runs, 73 skips
avx: 32478 decicycles in idct, 262045 runs, 99 skips
Difference between the 2:
stddev: 0.39 PSNR:104.47 MAXDIFF: 2
This is unavoidable and due to the scale factors used in the x86
version, which cannot match the C ones.
In addition, the trick of adding an initial bias to the input of a
pass can overflow, as the input coefficients are already 15bits,
which is the maximum this function can handle.
Overall, however, the omse on 12 bits samples goes from 0.16916 to
0.16883. Reducing rowshift by 1 improves to 0.0908, but causes
overflows.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2015-10-12 19:37:49 +02:00
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cglobal simple_idct12, 1, 1, 16
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; coeffs are already 15bits, adding the offset would cause
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; overflow in the input
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IDCT_FN "", 15, pw_2, 16
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RET
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cglobal simple_idct12_put, 3, 3, 16
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; range isn't known, so the C simple_idct range is used
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; Also, using a bias on input overflows, so use the bias
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; on output of the first butterfly instead
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IDCT_FN "", 15, pw_2, 16, 0, pw_4095
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RET
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2015-10-12 19:37:47 +02:00
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%endmacro
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INIT_XMM sse2
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idct_fn
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%if HAVE_AVX_EXTERNAL
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INIT_XMM avx
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idct_fn
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%endif
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%endif
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