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40e6575aa3
This is more spec-compliant because it does not rely on dead-code elimination by the compiler. Especially MSVC has problems with this, as can be seen in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/296373.html or https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/297022.html This commit does not eliminate every instance where we rely on dead code elimination: It only tackles branching to the initialization of arch-specific dsp code, not e.g. all uses of CONFIG_ and HAVE_ checks. But maybe it is already enough to compile FFmpeg with MSVC with whole-programm-optimizations enabled (if one does not disable too many components). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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* JPEG 2000 DSP functions
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* Copyright (c) 2007 Kamil Nowosad
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* Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
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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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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "jpeg2000dsp.h"
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/* Inverse ICT parameters in float and integer.
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* int value = (float value) * (1<<16) */
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static const float f_ict_params[4] = {
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1.402f,
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0.34413f,
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0.71414f,
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1.772f
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};
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static const int i_ict_params[4] = {
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91881,
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22553,
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46802,
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116130
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};
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static void ict_float(void *_src0, void *_src1, void *_src2, int csize)
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{
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float *src0 = _src0, *src1 = _src1, *src2 = _src2;
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float i0f, i1f, i2f;
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int i;
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for (i = 0; i < csize; i++) {
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i0f = *src0 + (f_ict_params[0] * *src2);
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i1f = *src0 - (f_ict_params[1] * *src1)
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- (f_ict_params[2] * *src2);
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i2f = *src0 + (f_ict_params[3] * *src1);
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*src0++ = i0f;
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*src1++ = i1f;
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*src2++ = i2f;
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}
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}
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static void ict_int(void *_src0, void *_src1, void *_src2, int csize)
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{
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int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2;
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int32_t i0, i1, i2;
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int i;
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for (i = 0; i < csize; i++) {
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i0 = *src0 + *src2 + ((int)((26345U * *src2) + (1 << 15)) >> 16);
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i1 = *src0 - ((int)(((unsigned)i_ict_params[1] * *src1) + (1 << 15)) >> 16)
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- ((int)(((unsigned)i_ict_params[2] * *src2) + (1 << 15)) >> 16);
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i2 = *src0 + (2 * *src1) + ((int)((-14942U * *src1) + (1 << 15)) >> 16);
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*src0++ = i0;
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*src1++ = i1;
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*src2++ = i2;
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}
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}
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static void rct_int(void *_src0, void *_src1, void *_src2, int csize)
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{
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int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2;
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int32_t i0, i1, i2;
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int i;
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for (i = 0; i < csize; i++) {
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i1 = *src0 - (*src2 + *src1 >> 2);
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i0 = i1 + *src2;
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i2 = i1 + *src1;
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*src0++ = i0;
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*src1++ = i1;
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*src2++ = i2;
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}
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}
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av_cold void ff_jpeg2000dsp_init(Jpeg2000DSPContext *c)
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{
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c->mct_decode[FF_DWT97] = ict_float;
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c->mct_decode[FF_DWT53] = rct_int;
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c->mct_decode[FF_DWT97_INT] = ict_int;
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#if ARCH_X86
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ff_jpeg2000dsp_init_x86(c);
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#endif
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}
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