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| 1 /* | 1 /* | 
| 2  * Copyright (C) 2012, Google Inc. All rights reserved. | 2  * Copyright (C) 2012, 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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| 65 | 65 | 
| 66   // quantumStartFrame     : Start frame of the current time quantum. | 66   // quantumStartFrame     : Start frame of the current time quantum. | 
| 67   // quantumEndFrame       : End frame of the current time quantum. | 67   // quantumEndFrame       : End frame of the current time quantum. | 
| 68   // startFrame            : Start frame for this source. | 68   // startFrame            : Start frame for this source. | 
| 69   // endFrame              : End frame for this source. | 69   // endFrame              : End frame for this source. | 
| 70   size_t quantumStartFrame = context()->currentSampleFrame(); | 70   size_t quantumStartFrame = context()->currentSampleFrame(); | 
| 71   size_t quantumEndFrame = quantumStartFrame + quantumFrameSize; | 71   size_t quantumEndFrame = quantumStartFrame + quantumFrameSize; | 
| 72   size_t startFrame = | 72   size_t startFrame = | 
| 73       AudioUtilities::timeToSampleFrame(m_startTime, sampleRate); | 73       AudioUtilities::timeToSampleFrame(m_startTime, sampleRate); | 
| 74   size_t endFrame = | 74   size_t endFrame = | 
| 75       m_endTime == UnknownTime ? 0 : AudioUtilities::timeToSampleFrame( | 75       m_endTime == UnknownTime | 
| 76                                          m_endTime, sampleRate); | 76           ? 0 | 
|  | 77           : AudioUtilities::timeToSampleFrame(m_endTime, sampleRate); | 
| 77 | 78 | 
| 78   // If we know the end time and it's already passed, then don't bother doing | 79   // If we know the end time and it's already passed, then don't bother doing | 
| 79   // any more rendering this cycle. | 80   // any more rendering this cycle. | 
| 80   if (m_endTime != UnknownTime && endFrame <= quantumStartFrame) | 81   if (m_endTime != UnknownTime && endFrame <= quantumStartFrame) | 
| 81     finish(); | 82     finish(); | 
| 82 | 83 | 
| 83   PlaybackState state = playbackState(); | 84   PlaybackState state = playbackState(); | 
| 84 | 85 | 
| 85   if (state == UNSCHEDULED_STATE || state == FINISHED_STATE || | 86   if (state == UNSCHEDULED_STATE || state == FINISHED_STATE || | 
| 86       startFrame >= quantumEndFrame) { | 87       startFrame >= quantumEndFrame) { | 
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| 280   // playback state if the context is closed. | 281   // playback state if the context is closed. | 
| 281   if (context()->isContextClosed()) | 282   if (context()->isContextClosed()) | 
| 282     return false; | 283     return false; | 
| 283 | 284 | 
| 284   // If a node is scheduled or playing, do not collect the node prematurely | 285   // If a node is scheduled or playing, do not collect the node prematurely | 
| 285   // even its reference is out of scope. Then fire onended event if assigned. | 286   // even its reference is out of scope. Then fire onended event if assigned. | 
| 286   return audioScheduledSourceHandler().isPlayingOrScheduled(); | 287   return audioScheduledSourceHandler().isPlayingOrScheduled(); | 
| 287 } | 288 } | 
| 288 | 289 | 
| 289 }  // namespace blink | 290 }  // namespace blink | 
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