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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 */ |