Statistics
| Branch: | Revision:

ffmpeg / libavutil / colorspace.h @ d370e3e9

History | View | Annotate | Download (3.58 KB)

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 */