summaryrefslogtreecommitdiffstats
path: root/media/ffvpx/libavutil/colorspace.h
blob: ef6f6107d6c7ce2a61c829bdd295566f116d39e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
/*
 * Colorspace conversion defines
 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Various defines for YUV<->RGB conversion
 */

#ifndef AVUTIL_COLORSPACE_H
#define AVUTIL_COLORSPACE_H

#define SCALEBITS 10
#define ONE_HALF  (1 << (SCALEBITS - 1))
#define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))

#define YUV_TO_RGB1_CCIR(cb1, cr1)\
{\
    cb = (cb1) - 128;\
    cr = (cr1) - 128;\
    r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
    g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
            ONE_HALF;\
    b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
}

#define YUV_TO_RGB1_CCIR_BT709(cb1, cr1)                      \
    {                                                         \
        cb    = (cb1) - 128;                                  \
        cr    = (cr1) - 128;                                  \
        r_add = ONE_HALF + FIX(1.5747 * 255.0 / 224.0) * cr;  \
        g_add = ONE_HALF - FIX(0.1873 * 255.0 / 224.0) * cb - \
                           FIX(0.4682 * 255.0 / 224.0) * cr;  \
        b_add = ONE_HALF + FIX(1.8556 * 255.0 / 224.0) * cb;  \
    }

// To be used for the BT709 variant as well
#define YUV_TO_RGB2_CCIR(r, g, b, y1)\
{\
    y = ((y1) - 16) * FIX(255.0/219.0);\
    r = cm[(y + r_add) >> SCALEBITS];\
    g = cm[(y + g_add) >> SCALEBITS];\
    b = cm[(y + b_add) >> SCALEBITS];\
}

#define YUV_TO_RGB1(cb1, cr1)\
{\
    cb = (cb1) - 128;\
    cr = (cr1) - 128;\
    r_add = FIX(1.40200) * cr + ONE_HALF;\
    g_add = - FIX(0.34414) * cb - FIX(0.71414) * cr + ONE_HALF;\
    b_add = FIX(1.77200) * cb + ONE_HALF;\
}

#define YUV_TO_RGB2(r, g, b, y1)\
{\
    y = (y1) << SCALEBITS;\
    r = cm[(y + r_add) >> SCALEBITS];\
    g = cm[(y + g_add) >> SCALEBITS];\
    b = cm[(y + b_add) >> SCALEBITS];\
}

#define Y_CCIR_TO_JPEG(y)\
 cm[((y) * FIX(255.0/219.0) + (ONE_HALF - 16 * FIX(255.0/219.0))) >> SCALEBITS]

#define Y_JPEG_TO_CCIR(y)\
 (((y) * FIX(219.0/255.0) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)

#define C_CCIR_TO_JPEG(y)\
 cm[(((y) - 128) * FIX(127.0/112.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS]

/* NOTE: the clamp is really necessary! */
static inline int C_JPEG_TO_CCIR(int y) {
    y = (((y - 128) * FIX(112.0/127.0) + (ONE_HALF + (128 << SCALEBITS))) >> SCALEBITS);
    if (y < 16)
        y = 16;
    return y;
}


#define RGB_TO_Y_CCIR(r, g, b) \
((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
  FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)

#define RGB_TO_U_CCIR(r1, g1, b1, shift)\
(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 +         \
     FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

#define RGB_TO_V_CCIR(r1, g1, b1, shift)\
(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 -           \
   FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

#define RGB_TO_Y_JPEG(r, g, b) \
(FFMIN((FIX(0.29900) * (r) + FIX(0.58700) * (g) + \
  FIX(0.11400) * (b) + (ONE_HALF)) >> SCALEBITS, 255))

#define RGB_TO_U_JPEG(r1, g1, b1)\
(((- FIX(0.16874) * r1 - FIX(0.33126) * g1 + \
     FIX(0.50000) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128)

#define RGB_TO_V_JPEG(r1, g1, b1)\
(((FIX(0.50000) * r1 - FIX(0.41869) * g1 - \
   FIX(0.08131) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128)

// Conversion macros for 8-bit RGB to YUV
// Derived from ITU-R BT.709-6 (06/2015) Item 3.5
// https://www.itu.int/rec/R-REC-BT.709-6-201506-I/en

#define RGB_TO_Y_BT709(r, g, b) \
((FIX(0.21260*219.0/255.0) * (r) + FIX(0.71520*219.0/255.0) * (g) + \
  FIX(0.07220*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)

#define RGB_TO_U_BT709(r1, g1, b1, shift)\
(((- FIX(0.11457*224.0/255.0) * r1 - FIX(0.38543*224.0/255.0) * g1 +         \
     FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

#define RGB_TO_V_BT709(r1, g1, b1, shift)\
(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.45415*224.0/255.0) * g1 -           \
   FIX(0.04585*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)

#define RGB_TO_Y_BT709_FULL(r, g, b) \
(FFMIN((FIX(0.21260) * (r) + FIX(0.71520) * (g) + \
  FIX(0.07220) * (b) + (ONE_HALF)) >> SCALEBITS, 255))

#define RGB_TO_U_BT709_FULL(r1, g1, b1)\
(((- FIX(0.11457) * r1 - FIX(0.38543) * g1 + \
     FIX(0.50000) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128)

#define RGB_TO_V_BT709_FULL(r1, g1, b1)\
(((FIX(0.50000) * r1 - FIX(0.45415) * g1 - \
   FIX(0.04585) * b1 + (ONE_HALF) - 1) >> (SCALEBITS)) + 128)

#endif /* AVUTIL_COLORSPACE_H */