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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_BASE_CHANNEL_LAYOUT_H_ | 5 #ifndef MEDIA_BASE_CHANNEL_LAYOUT_H_ |
6 #define MEDIA_BASE_CHANNEL_LAYOUT_H_ | 6 #define MEDIA_BASE_CHANNEL_LAYOUT_H_ |
7 | 7 |
8 #include "media/base/media_export.h" | 8 #include "media/base/media_export.h" |
9 | 9 |
10 namespace media { | 10 namespace media { |
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93 // Front L, Front R, Front C, Back L, Back R, LFE, Front LofC, Front RofC | 93 // Front L, Front R, Front C, Back L, Back R, LFE, Front LofC, Front RofC |
94 CHANNEL_LAYOUT_7_1_WIDE_BACK = 27, | 94 CHANNEL_LAYOUT_7_1_WIDE_BACK = 27, |
95 | 95 |
96 // Front L, Front R, Front C, Side L, Side R, Rear C, Back L, Back R. | 96 // Front L, Front R, Front C, Side L, Side R, Rear C, Back L, Back R. |
97 CHANNEL_LAYOUT_OCTAGONAL = 28, | 97 CHANNEL_LAYOUT_OCTAGONAL = 28, |
98 | 98 |
99 // Channels are not explicitly mapped to speakers. | 99 // Channels are not explicitly mapped to speakers. |
100 CHANNEL_LAYOUT_DISCRETE = 29, | 100 CHANNEL_LAYOUT_DISCRETE = 29, |
101 | 101 |
102 // Total number of layouts. | 102 // Total number of layouts. |
103 CHANNEL_LAYOUT_MAX // Must always be last! | 103 CHANNEL_LAYOUT_MAX = CHANNEL_LAYOUT_DISCRETE // Must always equal last entry! |
104 }; | 104 }; |
105 | 105 |
106 enum Channels { | 106 enum Channels { |
107 LEFT = 0, | 107 LEFT = 0, |
108 RIGHT, | 108 RIGHT, |
109 CENTER, | 109 CENTER, |
110 LFE, | 110 LFE, |
111 BACK_LEFT, | 111 BACK_LEFT, |
112 BACK_RIGHT, | 112 BACK_RIGHT, |
113 LEFT_OF_CENTER, | 113 LEFT_OF_CENTER, |
114 RIGHT_OF_CENTER, | 114 RIGHT_OF_CENTER, |
115 BACK_CENTER, | 115 BACK_CENTER, |
116 SIDE_LEFT, | 116 SIDE_LEFT, |
117 SIDE_RIGHT, | 117 SIDE_RIGHT, |
118 CHANNELS_MAX | 118 CHANNELS_MAX = SIDE_RIGHT, |
119 }; | 119 }; |
120 | 120 |
121 // Returns the expected channel position in an interleaved stream. Values of -1 | 121 // Returns the expected channel position in an interleaved stream. Values of -1 |
122 // mean the channel at that index is not used for that layout. Values range | 122 // mean the channel at that index is not used for that layout. Values range |
123 // from 0 to CHANNELS_MAX - 1. | 123 // from 0 to CHANNELS_MAX - 1. |
124 MEDIA_EXPORT int ChannelOrder(ChannelLayout layout, Channels channel); | 124 MEDIA_EXPORT int ChannelOrder(ChannelLayout layout, Channels channel); |
125 | 125 |
126 // Returns the number of channels in a given ChannelLayout. | 126 // Returns the number of channels in a given ChannelLayout. |
127 MEDIA_EXPORT int ChannelLayoutToChannelCount(ChannelLayout layout); | 127 MEDIA_EXPORT int ChannelLayoutToChannelCount(ChannelLayout layout); |
128 | 128 |
129 // Given the number of channels, return the best layout, | 129 // Given the number of channels, return the best layout, |
130 // or return CHANNEL_LAYOUT_UNSUPPORTED if there is no good match. | 130 // or return CHANNEL_LAYOUT_UNSUPPORTED if there is no good match. |
131 MEDIA_EXPORT ChannelLayout GuessChannelLayout(int channels); | 131 MEDIA_EXPORT ChannelLayout GuessChannelLayout(int channels); |
132 | 132 |
133 // Returns a string representation of the channel layout. | 133 // Returns a string representation of the channel layout. |
134 MEDIA_EXPORT const char* ChannelLayoutToString(ChannelLayout layout); | 134 MEDIA_EXPORT const char* ChannelLayoutToString(ChannelLayout layout); |
135 | 135 |
136 } // namespace media | 136 } // namespace media |
137 | 137 |
138 #endif // MEDIA_BASE_CHANNEL_LAYOUT_H_ | 138 #endif // MEDIA_BASE_CHANNEL_LAYOUT_H_ |
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