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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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| 43 // This basic implementation supports no more than one input and output. | 43 // This basic implementation supports no more than one input and output. |
| 44 // The "onaudioprocess" attribute is an event listener which will get called per
iodically with an AudioProcessingEvent which has | 44 // The "onaudioprocess" attribute is an event listener which will get called per
iodically with an AudioProcessingEvent which has |
| 45 // AudioBuffers for each input and output. | 45 // AudioBuffers for each input and output. |
| 46 | 46 |
| 47 class ScriptProcessorNode FINAL : public AudioNode { | 47 class ScriptProcessorNode FINAL : public AudioNode { |
| 48 public: | 48 public: |
| 49 // bufferSize must be one of the following values: 256, 512, 1024, 2048, 409
6, 8192, 16384. | 49 // bufferSize must be one of the following values: 256, 512, 1024, 2048, 409
6, 8192, 16384. |
| 50 // This value controls how frequently the onaudioprocess event handler is ca
lled and how many sample-frames need to be processed each call. | 50 // This value controls how frequently the onaudioprocess event handler is ca
lled and how many sample-frames need to be processed each call. |
| 51 // Lower numbers for bufferSize will result in a lower (better) latency. Hig
her numbers will be necessary to avoid audio breakup and glitches. | 51 // Lower numbers for bufferSize will result in a lower (better) latency. Hig
her numbers will be necessary to avoid audio breakup and glitches. |
| 52 // The value chosen must carefully balance between latency and audio quality
. | 52 // The value chosen must carefully balance between latency and audio quality
. |
| 53 static PassRefPtrWillBeRawPtr<ScriptProcessorNode> create(AudioContext*, flo
at sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numbe
rOfOutputChannels); | 53 static ScriptProcessorNode* create(AudioContext*, float sampleRate, size_t b
ufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels); |
| 54 | 54 |
| 55 virtual ~ScriptProcessorNode(); | 55 virtual ~ScriptProcessorNode(); |
| 56 | 56 |
| 57 // AudioNode | 57 // AudioNode |
| 58 virtual void dispose() OVERRIDE; | 58 virtual void dispose() OVERRIDE; |
| 59 virtual void process(size_t framesToProcess) OVERRIDE; | 59 virtual void process(size_t framesToProcess) OVERRIDE; |
| 60 virtual void initialize() OVERRIDE; | 60 virtual void initialize() OVERRIDE; |
| 61 virtual void uninitialize() OVERRIDE; | 61 virtual void uninitialize() OVERRIDE; |
| 62 | 62 |
| 63 size_t bufferSize() const { return m_bufferSize; } | 63 size_t bufferSize() const { return m_bufferSize; } |
| 64 | 64 |
| 65 DEFINE_ATTRIBUTE_EVENT_LISTENER(audioprocess); | 65 DEFINE_ATTRIBUTE_EVENT_LISTENER(audioprocess); |
| 66 | 66 |
| 67 void trace(Visitor*); | 67 void trace(Visitor*); |
| 68 | 68 |
| 69 private: | 69 private: |
| 70 virtual double tailTime() const OVERRIDE; | 70 virtual double tailTime() const OVERRIDE; |
| 71 virtual double latencyTime() const OVERRIDE; | 71 virtual double latencyTime() const OVERRIDE; |
| 72 | 72 |
| 73 ScriptProcessorNode(AudioContext*, float sampleRate, size_t bufferSize, unsi
gned numberOfInputChannels, unsigned numberOfOutputChannels); | 73 ScriptProcessorNode(AudioContext*, float sampleRate, size_t bufferSize, unsi
gned numberOfInputChannels, unsigned numberOfOutputChannels); |
| 74 | 74 |
| 75 void fireProcessEvent(); | 75 void fireProcessEvent(); |
| 76 | 76 |
| 77 // Double buffering | 77 // Double buffering |
| 78 unsigned doubleBufferIndex() const { return m_doubleBufferIndex; } | 78 unsigned doubleBufferIndex() const { return m_doubleBufferIndex; } |
| 79 void swapBuffers() { m_doubleBufferIndex = 1 - m_doubleBufferIndex; } | 79 void swapBuffers() { m_doubleBufferIndex = 1 - m_doubleBufferIndex; } |
| 80 unsigned m_doubleBufferIndex; | 80 unsigned m_doubleBufferIndex; |
| 81 unsigned m_doubleBufferIndexForEvent; | 81 unsigned m_doubleBufferIndexForEvent; |
| 82 WillBeHeapVector<RefPtrWillBeMember<AudioBuffer> > m_inputBuffers; | 82 HeapVector<Member<AudioBuffer> > m_inputBuffers; |
| 83 WillBeHeapVector<RefPtrWillBeMember<AudioBuffer> > m_outputBuffers; | 83 HeapVector<Member<AudioBuffer> > m_outputBuffers; |
| 84 | 84 |
| 85 size_t m_bufferSize; | 85 size_t m_bufferSize; |
| 86 unsigned m_bufferReadWriteIndex; | 86 unsigned m_bufferReadWriteIndex; |
| 87 | 87 |
| 88 unsigned m_numberOfInputChannels; | 88 unsigned m_numberOfInputChannels; |
| 89 unsigned m_numberOfOutputChannels; | 89 unsigned m_numberOfOutputChannels; |
| 90 | 90 |
| 91 RefPtr<AudioBus> m_internalInputBus; | 91 RefPtr<AudioBus> m_internalInputBus; |
| 92 // Synchronize process() with fireProcessEvent(). | 92 // Synchronize process() with fireProcessEvent(). |
| 93 mutable Mutex m_processEventLock; | 93 mutable Mutex m_processEventLock; |
| 94 }; | 94 }; |
| 95 | 95 |
| 96 } // namespace blink | 96 } // namespace blink |
| 97 | 97 |
| 98 #endif // ScriptProcessorNode_h | 98 #endif // ScriptProcessorNode_h |
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