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libavcodec/colorspace.h

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00001 /*
00002  * Colorspace conversion defines
00003  * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #ifndef AVCODEC_COLORSPACE_H
00028 #define AVCODEC_COLORSPACE_H
00029 
00030 #define SCALEBITS 10
00031 #define ONE_HALF  (1 << (SCALEBITS - 1))
00032 #define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
00033 
00034 #define YUV_TO_RGB1_CCIR(cb1, cr1)\
00035 {\
00036     cb = (cb1) - 128;\
00037     cr = (cr1) - 128;\
00038     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
00039     g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
00040             ONE_HALF;\
00041     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
00042 }
00043 
00044 #define YUV_TO_RGB2_CCIR(r, g, b, y1)\
00045 {\
00046     y = ((y1) - 16) * FIX(255.0/219.0);\
00047     r = cm[(y + r_add) >> SCALEBITS];\
00048     g = cm[(y + g_add) >> SCALEBITS];\
00049     b = cm[(y + b_add) >> SCALEBITS];\
00050 }
00051 
00052 #define YUV_TO_RGB1(cb1, cr1)\
00053 {\
00054     cb = (cb1) - 128;\
00055     cr = (cr1) - 128;\
00056     r_add = FIX(1.40200) * cr + ONE_HALF;\
00057     g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\
00058     b_add = FIX(1.77200) * cb + ONE_HALF;\
00059 }
00060 
00061 #define YUV_TO_RGB2(r, g, b, y1)\
00062 {\
00063     y = (y1) << SCALEBITS;\
00064     r = cm[(y + r_add) >> SCALEBITS];\
00065     g = cm[(y + g_add) >> SCALEBITS];\
00066     b = cm[(y + b_add) >> SCALEBITS];\
00067 }
00068 
00069 #define Y_CCIR_TO_JPEG(y)\
00070  cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS]
00071 
00072 #define Y_JPEG_TO_CCIR(y)\
00073  (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
00074 
00075 #define C_CCIR_TO_JPEG(y)\
00076  cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS]
00077 
00078 /* NOTE: the clamp is really necessary! */
00079 static inline int C_JPEG_TO_CCIR(int y) {
00080     y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS);
00081     if (y < 16)
00082         y = 16;
00083     return y;
00084 }
00085 
00086 
00087 #define RGB_TO_Y(r, g, b) \
00088 ((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \
00089   FIX(0.11400) * (b) + ONE_HALF) >> SCALEBITS)
00090 
00091 #define RGB_TO_U(r1, g1, b1, shift)\
00092 (((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +         \
00093      FIX(0.50000) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
00094 
00095 #define RGB_TO_V(r1, g1, b1, shift)\
00096 (((FIX(0.50000) * r1 - FIX(0.41869) * g1 -           \
00097    FIX(0.08131) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
00098 
00099 #define RGB_TO_Y_CCIR(r, g, b) \
00100 ((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
00101   FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
00102 
00103 #define RGB_TO_U_CCIR(r1, g1, b1, shift)\
00104 (((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 +         \
00105      FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
00106 
00107 #define RGB_TO_V_CCIR(r1, g1, b1, shift)\
00108 (((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 -           \
00109    FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
00110 
00111 #endif /* AVCODEC_COLORSPACE_H */

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