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https://github.com/FFmpeg/FFmpeg.git
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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>
128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/*
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* Lossless video DSP utils
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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 "lossless_videodsp.h"
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#include "libavcodec/mathops.h"
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// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
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#define pb_7f (~0UL / 255 * 0x7f)
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#define pb_80 (~0UL / 255 * 0x80)
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static void add_bytes_c(uint8_t *dst, uint8_t *src, ptrdiff_t w)
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{
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long i;
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for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
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long a = *(long *) (src + i);
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long b = *(long *) (dst + i);
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*(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
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}
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for (; i < w; i++)
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dst[i + 0] += src[i + 0];
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}
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static void add_median_pred_c(uint8_t *dst, const uint8_t *src1,
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const uint8_t *diff, ptrdiff_t w,
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int *left, int *left_top)
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{
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int i;
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uint8_t l, lt;
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l = *left;
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lt = *left_top;
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for (i = 0; i < w; i++) {
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l = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i];
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lt = src1[i];
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dst[i] = l;
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}
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*left = l;
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*left_top = lt;
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}
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static int add_left_pred_c(uint8_t *dst, const uint8_t *src, ptrdiff_t w,
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int acc)
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{
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int i;
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for (i = 0; i < w - 1; i++) {
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acc += src[i];
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dst[i] = acc;
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i++;
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acc += src[i];
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dst[i] = acc;
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}
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for (; i < w; i++) {
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acc += src[i];
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dst[i] = acc;
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}
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return acc;
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}
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static int add_left_pred_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, ptrdiff_t w, unsigned acc){
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int i;
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for(i=0; i<w-1; i++){
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acc+= src[i];
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dst[i]= acc &= mask;
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i++;
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acc+= src[i];
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dst[i]= acc &= mask;
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}
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for(; i<w; i++){
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acc+= src[i];
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dst[i]= acc &= mask;
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}
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return acc;
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}
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static void add_gradient_pred_c(uint8_t *src, const ptrdiff_t stride, const ptrdiff_t width){
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int A, B, C, i;
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for (i = 0; i < width; i++) {
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A = src[i - stride];
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B = src[i - (stride + 1)];
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C = src[i - 1];
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src[i] = (A - B + C + src[i]) & 0xFF;
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}
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}
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void ff_llviddsp_init(LLVidDSPContext *c)
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{
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c->add_bytes = add_bytes_c;
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c->add_median_pred = add_median_pred_c;
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c->add_left_pred = add_left_pred_c;
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c->add_left_pred_int16 = add_left_pred_int16_c;
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c->add_gradient_pred = add_gradient_pred_c;
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#if ARCH_PPC
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ff_llviddsp_init_ppc(c);
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#elif ARCH_X86
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ff_llviddsp_init_x86(c);
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#endif
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}
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