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  1. /*
  2.  * Copyright (C) 2015 Pedro Arthur <bygrandao@gmail.com>
  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.  
  21. #include "swscale_internal.h"
  22.  
  23. typedef struct GammaContext
  24. {
  25.     uint16_t *table;
  26. } GammaContext;
  27.  
  28. // gamma_convert expects 16 bit rgb format
  29. // it writes directly in src slice thus it must be modifiable (done through cascade context)
  30. static int gamma_convert(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
  31. {
  32.     GammaContext *instance = desc->instance;
  33.     uint16_t *table = instance->table;
  34.     int srcW = desc->src->width;
  35.  
  36.     int i;
  37.     for (i = 0; i < sliceH; ++i) {
  38.         uint8_t ** src = desc->src->plane[0].line;
  39.         int src_pos = sliceY+i - desc->src->plane[0].sliceY;
  40.  
  41.         uint16_t *src1 = (uint16_t*)*(src+src_pos);
  42.         int j;
  43.         for (j = 0; j < srcW; ++j) {
  44.             uint16_t r = AV_RL16(src1 + j*4 + 0);
  45.             uint16_t g = AV_RL16(src1 + j*4 + 1);
  46.             uint16_t b = AV_RL16(src1 + j*4 + 2);
  47.  
  48.             AV_WL16(src1 + j*4 + 0, table[r]);
  49.             AV_WL16(src1 + j*4 + 1, table[g]);
  50.             AV_WL16(src1 + j*4 + 2, table[b]);
  51.         }
  52.  
  53.     }
  54.     return sliceH;
  55. }
  56.  
  57.  
  58. int ff_init_gamma_convert(SwsFilterDescriptor *desc, SwsSlice * src, uint16_t *table)
  59. {
  60.     GammaContext *li = av_malloc(sizeof(GammaContext));
  61.     if (!li)
  62.         return AVERROR(ENOMEM);
  63.     li->table = table;
  64.  
  65.     desc->instance = li;
  66.     desc->src = src;
  67.     desc->dst = NULL;
  68.     desc->process = &gamma_convert;
  69.  
  70.     return 0;
  71. }
  72.  
  73.