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  1. /*
  2.  * Colorspace conversion defines
  3.  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * Various defines for YUV<->RGB conversion
  25.  */
  26.  
  27. #ifndef AVUTIL_COLORSPACE_H
  28. #define AVUTIL_COLORSPACE_H
  29.  
  30. #define SCALEBITS 10
  31. #define ONE_HALF  (1 << (SCALEBITS - 1))
  32. #define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
  33.  
  34. #define YUV_TO_RGB1_CCIR(cb1, cr1)\
  35. {\
  36.     cb = (cb1) - 128;\
  37.     cr = (cr1) - 128;\
  38.     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
  39.     g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
  40.             ONE_HALF;\
  41.     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
  42. }
  43.  
  44. #define YUV_TO_RGB2_CCIR(r, g, b, y1)\
  45. {\
  46.     y = ((y1) - 16) * FIX(255.0/219.0);\
  47.     r = cm[(y + r_add) >> SCALEBITS];\
  48.     g = cm[(y + g_add) >> SCALEBITS];\
  49.     b = cm[(y + b_add) >> SCALEBITS];\
  50. }
  51.  
  52. #define YUV_TO_RGB1(cb1, cr1)\
  53. {\
  54.     cb = (cb1) - 128;\
  55.     cr = (cr1) - 128;\
  56.     r_add = FIX(1.40200) * cr + ONE_HALF;\
  57.     g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\
  58.     b_add = FIX(1.77200) * cb + ONE_HALF;\
  59. }
  60.  
  61. #define YUV_TO_RGB2(r, g, b, y1)\
  62. {\
  63.     y = (y1) << SCALEBITS;\
  64.     r = cm[(y + r_add) >> SCALEBITS];\
  65.     g = cm[(y + g_add) >> SCALEBITS];\
  66.     b = cm[(y + b_add) >> SCALEBITS];\
  67. }
  68.  
  69. #define Y_CCIR_TO_JPEG(y)\
  70.  cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS]
  71.  
  72. #define Y_JPEG_TO_CCIR(y)\
  73.  (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
  74.  
  75. #define C_CCIR_TO_JPEG(y)\
  76.  cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS]
  77.  
  78. /* NOTE: the clamp is really necessary! */
  79. static inline int C_JPEG_TO_CCIR(int y) {
  80.     y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS);
  81.     if (y < 16)
  82.         y = 16;
  83.     return y;
  84. }
  85.  
  86.  
  87. #define RGB_TO_Y(r, g, b) \
  88. ((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \
  89.   FIX(0.11400) * (b) + ONE_HALF) >> SCALEBITS)
  90.  
  91. #define RGB_TO_U(r1, g1, b1, shift)\
  92. (((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +         \
  93.      FIX(0.50000) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
  94.  
  95. #define RGB_TO_V(r1, g1, b1, shift)\
  96. (((FIX(0.50000) * r1 - FIX(0.41869) * g1 -           \
  97.    FIX(0.08131) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
  98.  
  99. #define RGB_TO_Y_CCIR(r, g, b) \
  100. ((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
  101.   FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
  102.  
  103. #define RGB_TO_U_CCIR(r1, g1, b1, shift)\
  104. (((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 +         \
  105.      FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
  106.  
  107. #define RGB_TO_V_CCIR(r1, g1, b1, shift)\
  108. (((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 -           \
  109.    FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
  110.  
  111. #endif /* AVUTIL_COLORSPACE_H */
  112.