00ed0ff7b80cfdfb59ed2a3350153dcab421bd26
[ffmpeg.git] / libavutil / audioconvert.h
1 /*
2  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  * Copyright (c) 2008 Peter Ross
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 #ifndef AVUTIL_AUDIOCONVERT_H
23 #define AVUTIL_AUDIOCONVERT_H
24
25 #include <stdint.h>
26
27 /**
28  * @file
29  * audio conversion routines
30  */
31
32 /**
33  * @addtogroup lavu_audio
34  * @{
35  */
36
37 /**
38  * @defgroup channel_masks Audio channel masks
39  * @{
40  */
41 #define AV_CH_FRONT_LEFT             0x00000001
42 #define AV_CH_FRONT_RIGHT            0x00000002
43 #define AV_CH_FRONT_CENTER           0x00000004
44 #define AV_CH_LOW_FREQUENCY          0x00000008
45 #define AV_CH_BACK_LEFT              0x00000010
46 #define AV_CH_BACK_RIGHT             0x00000020
47 #define AV_CH_FRONT_LEFT_OF_CENTER   0x00000040
48 #define AV_CH_FRONT_RIGHT_OF_CENTER  0x00000080
49 #define AV_CH_BACK_CENTER            0x00000100
50 #define AV_CH_SIDE_LEFT              0x00000200
51 #define AV_CH_SIDE_RIGHT             0x00000400
52 #define AV_CH_TOP_CENTER             0x00000800
53 #define AV_CH_TOP_FRONT_LEFT         0x00001000
54 #define AV_CH_TOP_FRONT_CENTER       0x00002000
55 #define AV_CH_TOP_FRONT_RIGHT        0x00004000
56 #define AV_CH_TOP_BACK_LEFT          0x00008000
57 #define AV_CH_TOP_BACK_CENTER        0x00010000
58 #define AV_CH_TOP_BACK_RIGHT         0x00020000
59 #define AV_CH_STEREO_LEFT            0x20000000  ///< Stereo downmix.
60 #define AV_CH_STEREO_RIGHT           0x40000000  ///< See AV_CH_STEREO_LEFT.
61 #define AV_CH_WIDE_LEFT              0x0000000080000000ULL
62 #define AV_CH_WIDE_RIGHT             0x0000000100000000ULL
63 #define AV_CH_SURROUND_DIRECT_LEFT   0x0000000200000000ULL
64 #define AV_CH_SURROUND_DIRECT_RIGHT  0x0000000400000000ULL
65
66 /** Channel mask value used for AVCodecContext.request_channel_layout
67     to indicate that the user requests the channel order of the decoder output
68     to be the native codec channel order. */
69 #define AV_CH_LAYOUT_NATIVE          0x8000000000000000ULL
70
71 /**
72  * @}
73  * @defgroup channel_mask_c Audio channel convenience macros
74  * @{
75  * */
76 #define AV_CH_LAYOUT_MONO              (AV_CH_FRONT_CENTER)
77 #define AV_CH_LAYOUT_STEREO            (AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT)
78 #define AV_CH_LAYOUT_2POINT1           (AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY)
79 #define AV_CH_LAYOUT_2_1               (AV_CH_LAYOUT_STEREO|AV_CH_BACK_CENTER)
80 #define AV_CH_LAYOUT_SURROUND          (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER)
81 #define AV_CH_LAYOUT_3POINT1           (AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY)
82 #define AV_CH_LAYOUT_4POINT0           (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_CENTER)
83 #define AV_CH_LAYOUT_4POINT1           (AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY)
84 #define AV_CH_LAYOUT_2_2               (AV_CH_LAYOUT_STEREO|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)
85 #define AV_CH_LAYOUT_QUAD              (AV_CH_LAYOUT_STEREO|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
86 #define AV_CH_LAYOUT_5POINT0           (AV_CH_LAYOUT_SURROUND|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)
87 #define AV_CH_LAYOUT_5POINT1           (AV_CH_LAYOUT_5POINT0|AV_CH_LOW_FREQUENCY)
88 #define AV_CH_LAYOUT_5POINT0_BACK      (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
89 #define AV_CH_LAYOUT_5POINT1_BACK      (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_LOW_FREQUENCY)
90 #define AV_CH_LAYOUT_6POINT0           (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_CENTER)
91 #define AV_CH_LAYOUT_6POINT0_FRONT     (AV_CH_LAYOUT_2_2|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
92 #define AV_CH_LAYOUT_HEXAGONAL         (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_BACK_CENTER)
93 #define AV_CH_LAYOUT_6POINT1           (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_CENTER)
94 #define AV_CH_LAYOUT_6POINT1_BACK      (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER)
95 #define AV_CH_LAYOUT_6POINT1_FRONT     (AV_CH_LAYOUT_6POINT0_FRONT|AV_CH_LOW_FREQUENCY)
96 #define AV_CH_LAYOUT_7POINT0           (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
97 #define AV_CH_LAYOUT_7POINT0_FRONT     (AV_CH_LAYOUT_5POINT0|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
98 #define AV_CH_LAYOUT_7POINT1           (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
99 #define AV_CH_LAYOUT_7POINT1_WIDE      (AV_CH_LAYOUT_5POINT1|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
100 #define AV_CH_LAYOUT_OCTAGONAL         (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_CENTER|AV_CH_BACK_RIGHT)
101 #define AV_CH_LAYOUT_STEREO_DOWNMIX    (AV_CH_STEREO_LEFT|AV_CH_STEREO_RIGHT)
102
103 /**
104  * @}
105  */
106
107 /**
108  * Return a channel layout id that matches name, 0 if no match.
109  */
110 uint64_t av_get_channel_layout(const char *name);
111
112 /**
113  * Return a description of a channel layout.
114  * If nb_channels is <= 0, it is guessed from the channel_layout.
115  *
116  * @param buf put here the string containing the channel layout
117  * @param buf_size size in bytes of the buffer
118  */
119 void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout);
120
121 /**
122  * Return the number of channels in the channel layout.
123  */
124 int av_get_channel_layout_nb_channels(uint64_t channel_layout);
125
126 /**
127  * @}
128  */
129
130 #endif /* AVUTIL_AUDIOCONVERT_H */