mirror of
https://git.ffmpeg.org/ffmpeg.git
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129 lines
3.9 KiB
C
129 lines
3.9 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 "avcodec.h"
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#include "lossless_videodsp.h"
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#include "libavcodec/mathops.h"
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static void add_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, int w){
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long i;
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unsigned long pw_lsb = (mask >> 1) * 0x0001000100010001ULL;
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unsigned long pw_msb = pw_lsb + 0x0001000100010001ULL;
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for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) {
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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&pw_lsb) + (b&pw_lsb)) ^ ((a^b)&pw_msb);
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}
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for(; i<w; i++)
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dst[i] = (dst[i] + src[i]) & mask;
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}
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static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w){
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long i;
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#if !HAVE_FAST_UNALIGNED
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if((long)src2 & (sizeof(long)-1)){
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for(i=0; i+3<w; i+=4){
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dst[i+0] = (src1[i+0]-src2[i+0]) & mask;
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dst[i+1] = (src1[i+1]-src2[i+1]) & mask;
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dst[i+2] = (src1[i+2]-src2[i+2]) & mask;
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dst[i+3] = (src1[i+3]-src2[i+3]) & mask;
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}
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}else
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#endif
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{
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unsigned long pw_lsb = (mask >> 1) * 0x0001000100010001ULL;
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unsigned long pw_msb = pw_lsb + 0x0001000100010001ULL;
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for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) {
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long a = *(long*)(src1+i);
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long b = *(long*)(src2+i);
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*(long*)(dst+i) = ((a|pw_msb) - (b&pw_lsb)) ^ ((a^b^pw_msb)&pw_msb);
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}
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}
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for (; i<w; i++)
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dst[i] = (src1[i] - src2[i]) & mask;
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}
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static void add_hfyu_median_prediction_int16_c(uint16_t *dst, const uint16_t *src, const uint16_t *diff, unsigned mask, int w, int *left, int *left_top){
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int i;
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uint16_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, src[i], (l + src[i] - lt) & mask) + diff[i]) & mask;
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lt = src[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 void sub_hfyu_median_prediction_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w, int *left, int *left_top){
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int i;
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uint16_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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const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & mask);
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lt = src1[i];
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l = src2[i];
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dst[i] = (l - pred) & mask;
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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_hfyu_left_prediction_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, int 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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void ff_llviddsp_init(LLVidDSPContext *c, AVCodecContext *avctx)
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{
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c->add_int16 = add_int16_c;
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c->diff_int16= diff_int16_c;
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c->add_hfyu_left_prediction_int16 = add_hfyu_left_prediction_int16_c;
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c->add_hfyu_median_prediction_int16 = add_hfyu_median_prediction_int16_c;
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c->sub_hfyu_median_prediction_int16 = sub_hfyu_median_prediction_int16_c;
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if (ARCH_X86)
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ff_llviddsp_init_x86(c, avctx);
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}
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