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
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_BASE_CHANNEL_LAYOUT_H_
#define MEDIA_BASE_CHANNEL_LAYOUT_H_
#include "build/build_config.h"
#include "media/base/media_export.h"
enum ChannelLayout {
CHANNEL_LAYOUT_NONE = 0,
CHANNEL_LAYOUT_UNSUPPORTED,
// Front C
CHANNEL_LAYOUT_MONO,
// Front L, Front R
CHANNEL_LAYOUT_STEREO,
// Front L, Front R, Back C
CHANNEL_LAYOUT_2_1,
// Front L, Front R, Front C
CHANNEL_LAYOUT_SURROUND,
// Front L, Front R, Front C, Back C
CHANNEL_LAYOUT_4_0,
// Front L, Front R, Side L, Side R
CHANNEL_LAYOUT_2_2,
// Front L, Front R, Back L, Back R
CHANNEL_LAYOUT_QUAD,
// Front L, Front R, Front C, Side L, Side R
CHANNEL_LAYOUT_5_0,
// Front L, Front R, Front C, Side L, Side R, LFE
CHANNEL_LAYOUT_5_1,
// Front L, Front R, Front C, Back L, Back R
CHANNEL_LAYOUT_5_0_BACK,
// Front L, Front R, Front C, Back L, Back R, LFE
CHANNEL_LAYOUT_5_1_BACK,
// Front L, Front R, Front C, Side L, Side R, Back L, Back R
CHANNEL_LAYOUT_7_0,
// Front L, Front R, Front C, Side L, Side R, LFE, Back L, Back R
CHANNEL_LAYOUT_7_1,
// Front L, Front R, Front C, Back L, Back R, LFE, Front LofC, Front RofC
CHANNEL_LAYOUT_7_1_WIDE,
// Stereo L, Stereo R
CHANNEL_LAYOUT_STEREO_DOWNMIX,
// Total number of layouts.
CHANNEL_LAYOUT_MAX
};
enum Channels {
LEFT = 0,
RIGHT,
CENTER,
LFE,
BACK_LEFT,
BACK_RIGHT,
LEFT_OF_CENTER,
RIGHT_OF_CENTER,
BACK_CENTER,
SIDE_LEFT,
SIDE_RIGHT,
STEREO_LEFT,
STEREO_RIGHT,
CHANNELS_MAX
};
#if defined(OS_MACOSX) || defined(USE_PULSEAUDIO)
// The channel orderings for each layout as specified by FFmpeg.
// Values represent the index of each channel in each layout. For example, the
// left side surround sound channel in FFmpeg's 5.1 layout is in the 5th
// position (because the order is L, R, C, LFE, LS, RS), so
// kChannelOrderings[CHANNEL_LAYOUT_5POINT1][SIDE_LEFT] = 4;
// Values of -1 mean the channel at that index is not used for that layout.
extern const int kChannelOrderings[CHANNEL_LAYOUT_MAX][CHANNELS_MAX];
#endif
// Returns the number of channels in a given ChannelLayout.
MEDIA_EXPORT int ChannelLayoutToChannelCount(ChannelLayout layout);
#endif // MEDIA_BASE_CHANNEL_LAYOUT_H_
|
