Globally rename the header inclusion guard names.
[libav.git] / libavcodec / colorspace.h
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 colorspace.h
24 * Various defines for YUV<->RGB conversion
25 */
26
27 #ifndef AVCODEC_COLORSPACE_H
28 #define AVCODEC_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 /* AVCODEC_COLORSPACE_H */