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  1. /*
  2.  * Lossless video DSP utils
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20. #include "avcodec.h"
  21. #include "lossless_videodsp.h"
  22. #include "libavcodec/mathops.h"
  23.  
  24. static void add_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, int w){
  25.     long i;
  26.     unsigned long pw_lsb = (mask >> 1) * 0x0001000100010001ULL;
  27.     unsigned long pw_msb = pw_lsb +  0x0001000100010001ULL;
  28.     for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) {
  29.         long a = *(long*)(src+i);
  30.         long b = *(long*)(dst+i);
  31.         *(long*)(dst+i) = ((a&pw_lsb) + (b&pw_lsb)) ^ ((a^b)&pw_msb);
  32.     }
  33.     for(; i<w; i++)
  34.         dst[i] = (dst[i] + src[i]) & mask;
  35. }
  36.  
  37. static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w){
  38.     long i;
  39. #if !HAVE_FAST_UNALIGNED
  40.     if((long)src2 & (sizeof(long)-1)){
  41.         for(i=0; i+3<w; i+=4){
  42.             dst[i+0] = (src1[i+0]-src2[i+0]) & mask;
  43.             dst[i+1] = (src1[i+1]-src2[i+1]) & mask;
  44.             dst[i+2] = (src1[i+2]-src2[i+2]) & mask;
  45.             dst[i+3] = (src1[i+3]-src2[i+3]) & mask;
  46.         }
  47.     }else
  48. #endif
  49.     {
  50.         unsigned long pw_lsb = (mask >> 1) * 0x0001000100010001ULL;
  51.         unsigned long pw_msb = pw_lsb +  0x0001000100010001ULL;
  52.  
  53.         for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) {
  54.             long a = *(long*)(src1+i);
  55.             long b = *(long*)(src2+i);
  56.             *(long*)(dst+i) = ((a|pw_msb) - (b&pw_lsb)) ^ ((a^b^pw_msb)&pw_msb);
  57.         }
  58.     }
  59.     for (; i<w; i++)
  60.         dst[i] = (src1[i] - src2[i]) & mask;
  61. }
  62.  
  63. static void add_hfyu_median_pred_int16_c(uint16_t *dst, const uint16_t *src, const uint16_t *diff, unsigned mask, int w, int *left, int *left_top){
  64.     int i;
  65.     uint16_t l, lt;
  66.  
  67.     l  = *left;
  68.     lt = *left_top;
  69.  
  70.     for(i=0; i<w; i++){
  71.         l  = (mid_pred(l, src[i], (l + src[i] - lt) & mask) + diff[i]) & mask;
  72.         lt = src[i];
  73.         dst[i] = l;
  74.     }
  75.  
  76.     *left     = l;
  77.     *left_top = lt;
  78. }
  79.  
  80. static void sub_hfyu_median_pred_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w, int *left, int *left_top){
  81.     int i;
  82.     uint16_t l, lt;
  83.  
  84.     l  = *left;
  85.     lt = *left_top;
  86.  
  87.     for(i=0; i<w; i++){
  88.         const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & mask);
  89.         lt = src1[i];
  90.         l  = src2[i];
  91.         dst[i] = (l - pred) & mask;
  92.     }
  93.  
  94.     *left     = l;
  95.     *left_top = lt;
  96. }
  97.  
  98. static int add_hfyu_left_pred_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, int w, unsigned acc){
  99.     int i;
  100.  
  101.     for(i=0; i<w-1; i++){
  102.         acc+= src[i];
  103.         dst[i]= acc & mask;
  104.         i++;
  105.         acc+= src[i];
  106.         dst[i]= acc & mask;
  107.     }
  108.  
  109.     for(; i<w; i++){
  110.         acc+= src[i];
  111.         dst[i]= acc & mask;
  112.     }
  113.  
  114.     return acc;
  115. }
  116.  
  117.  
  118. void ff_llviddsp_init(LLVidDSPContext *c, AVCodecContext *avctx)
  119. {
  120.     c->add_int16 = add_int16_c;
  121.     c->diff_int16= diff_int16_c;
  122.     c->add_hfyu_left_pred_int16   = add_hfyu_left_pred_int16_c;
  123.     c->add_hfyu_median_pred_int16 = add_hfyu_median_pred_int16_c;
  124.     c->sub_hfyu_median_pred_int16 = sub_hfyu_median_pred_int16_c;
  125.  
  126.     if (ARCH_X86)
  127.         ff_llviddsp_init_x86(c, avctx);
  128. }
  129.