OLD | NEW |
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 |
(...skipping 143 matching lines...) Loading... |
154 // When this happens, fire an event and swap buffers. | 154 // When this happens, fire an event and swap buffers. |
155 if (!m_bufferReadWriteIndex) { | 155 if (!m_bufferReadWriteIndex) { |
156 // Avoid building up requests on the main thread to fire process events
when they're not being handled. | 156 // Avoid building up requests on the main thread to fire process events
when they're not being handled. |
157 // This could be a problem if the main thread is very busy doing other t
hings and is being held up handling previous requests. | 157 // This could be a problem if the main thread is very busy doing other t
hings and is being held up handling previous requests. |
158 // The audio thread can't block on this lock, so we call tryLock() inste
ad. | 158 // The audio thread can't block on this lock, so we call tryLock() inste
ad. |
159 MutexTryLocker tryLocker(m_processEventLock); | 159 MutexTryLocker tryLocker(m_processEventLock); |
160 if (!tryLocker.locked()) { | 160 if (!tryLocker.locked()) { |
161 // We're late in handling the previous request. The main thread must
be very busy. | 161 // We're late in handling the previous request. The main thread must
be very busy. |
162 // The best we can do is clear out the buffer ourself here. | 162 // The best we can do is clear out the buffer ourself here. |
163 outputBuffer->zero(); | 163 outputBuffer->zero(); |
164 } else if (context()->executionContext()) { | 164 } else if (context()->getExecutionContext()) { |
165 // Fire the event on the main thread with the appropriate buffer | 165 // Fire the event on the main thread with the appropriate buffer |
166 // index. | 166 // index. |
167 context()->executionContext()->postTask(BLINK_FROM_HERE, | 167 context()->getExecutionContext()->postTask(BLINK_FROM_HERE, |
168 createCrossThreadTask(&ScriptProcessorHandler::fireProcessEvent,
this, m_doubleBufferIndex)); | 168 createCrossThreadTask(&ScriptProcessorHandler::fireProcessEvent,
this, m_doubleBufferIndex)); |
169 } | 169 } |
170 | 170 |
171 swapBuffers(); | 171 swapBuffers(); |
172 } | 172 } |
173 } | 173 } |
174 | 174 |
175 void ScriptProcessorHandler::fireProcessEvent(unsigned doubleBufferIndex) | 175 void ScriptProcessorHandler::fireProcessEvent(unsigned doubleBufferIndex) |
176 { | 176 { |
177 ASSERT(isMainThread()); | 177 ASSERT(isMainThread()); |
178 | 178 |
179 ASSERT(doubleBufferIndex < 2); | 179 ASSERT(doubleBufferIndex < 2); |
180 if (doubleBufferIndex > 1) | 180 if (doubleBufferIndex > 1) |
181 return; | 181 return; |
182 | 182 |
183 AudioBuffer* inputBuffer = m_inputBuffers[doubleBufferIndex].get(); | 183 AudioBuffer* inputBuffer = m_inputBuffers[doubleBufferIndex].get(); |
184 AudioBuffer* outputBuffer = m_outputBuffers[doubleBufferIndex].get(); | 184 AudioBuffer* outputBuffer = m_outputBuffers[doubleBufferIndex].get(); |
185 ASSERT(outputBuffer); | 185 ASSERT(outputBuffer); |
186 if (!outputBuffer) | 186 if (!outputBuffer) |
187 return; | 187 return; |
188 | 188 |
189 // Avoid firing the event if the document has already gone away. | 189 // Avoid firing the event if the document has already gone away. |
190 if (node() && context() && context()->executionContext()) { | 190 if (node() && context() && context()->getExecutionContext()) { |
191 // This synchronizes with process(). | 191 // This synchronizes with process(). |
192 MutexLocker processLocker(m_processEventLock); | 192 MutexLocker processLocker(m_processEventLock); |
193 | 193 |
194 // Calculate a playbackTime with the buffersize which needs to be proces
sed each time onaudioprocess is called. | 194 // Calculate a playbackTime with the buffersize which needs to be proces
sed each time onaudioprocess is called. |
195 // The outputBuffer being passed to JS will be played after exhuasting p
revious outputBuffer by double-buffering. | 195 // The outputBuffer being passed to JS will be played after exhuasting p
revious outputBuffer by double-buffering. |
196 double playbackTime = (context()->currentSampleFrame() + m_bufferSize) /
static_cast<double>(context()->sampleRate()); | 196 double playbackTime = (context()->currentSampleFrame() + m_bufferSize) /
static_cast<double>(context()->sampleRate()); |
197 | 197 |
198 // Call the JavaScript event handler which will do the audio processing. | 198 // Call the JavaScript event handler which will do the audio processing. |
199 node()->dispatchEvent(AudioProcessingEvent::create(inputBuffer, outputBu
ffer, playbackTime)); | 199 node()->dispatchEvent(AudioProcessingEvent::create(inputBuffer, outputBu
ffer, playbackTime)); |
200 } | 200 } |
(...skipping 102 matching lines...) Loading... |
303 // If |onaudioprocess| event handler is defined, the node should not be | 303 // If |onaudioprocess| event handler is defined, the node should not be |
304 // GCed even if it is out of scope. | 304 // GCed even if it is out of scope. |
305 if (hasEventListeners(EventTypeNames::audioprocess)) | 305 if (hasEventListeners(EventTypeNames::audioprocess)) |
306 return true; | 306 return true; |
307 | 307 |
308 return false; | 308 return false; |
309 } | 309 } |
310 | 310 |
311 } // namespace blink | 311 } // namespace blink |
312 | 312 |
OLD | NEW |