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1 /* | 1 /* |
2 * Copyright (C) 2010, Google Inc. All rights reserved. | 2 * Copyright (C) 2010, Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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90 // As soon as we know the channel count of our input, we can lazily initialize. | 90 // As soon as we know the channel count of our input, we can lazily initialize. |
91 // Sometimes this may be called more than once with different channel counts, in
which case we must safely | 91 // Sometimes this may be called more than once with different channel counts, in
which case we must safely |
92 // uninitialize and then re-initialize with the new channel count. | 92 // uninitialize and then re-initialize with the new channel count. |
93 void GainNode::checkNumberOfChannelsForInput(AudioNodeInput* input) | 93 void GainNode::checkNumberOfChannelsForInput(AudioNodeInput* input) |
94 { | 94 { |
95 ASSERT(context()->isAudioThread() && context()->isGraphOwner()); | 95 ASSERT(context()->isAudioThread() && context()->isGraphOwner()); |
96 | 96 |
97 ASSERT(input && input == this->input(0)); | 97 ASSERT(input && input == this->input(0)); |
98 if (input != this->input(0)) | 98 if (input != this->input(0)) |
99 return; | 99 return; |
100 | 100 |
101 unsigned numberOfChannels = input->numberOfChannels(); | 101 unsigned numberOfChannels = input->numberOfChannels(); |
102 | 102 |
103 if (isInitialized() && numberOfChannels != output(0)->numberOfChannels()) { | 103 if (isInitialized() && numberOfChannels != output(0)->numberOfChannels()) { |
104 // We're already initialized but the channel count has changed. | 104 // We're already initialized but the channel count has changed. |
105 uninitialize(); | 105 uninitialize(); |
106 } | 106 } |
107 | 107 |
108 if (!isInitialized()) { | 108 if (!isInitialized()) { |
109 // This will propagate the channel count to any nodes connected further
downstream in the graph. | 109 // This will propagate the channel count to any nodes connected further
downstream in the graph. |
110 output(0)->setNumberOfChannels(numberOfChannels); | 110 output(0)->setNumberOfChannels(numberOfChannels); |
111 initialize(); | 111 initialize(); |
112 } | 112 } |
113 | 113 |
114 AudioNode::checkNumberOfChannelsForInput(input); | 114 AudioNode::checkNumberOfChannelsForInput(input); |
115 } | 115 } |
116 | 116 |
117 } // namespace WebCore | 117 } // namespace WebCore |
118 | 118 |
119 #endif // ENABLE(WEB_AUDIO) | 119 #endif // ENABLE(WEB_AUDIO) |
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