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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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37 class AudioBuffer; | 37 class AudioBuffer; |
38 class AudioContext; | 38 class AudioContext; |
39 class AudioProcessingEvent; | 39 class AudioProcessingEvent; |
40 | 40 |
41 // ScriptProcessorNode is an AudioNode which allows for arbitrary synthesis or p
rocessing directly using JavaScript. | 41 // ScriptProcessorNode is an AudioNode which allows for arbitrary synthesis or p
rocessing directly using JavaScript. |
42 // The API allows for a variable number of inputs and outputs, although it must
have at least one input or output. | 42 // The API allows for a variable number of inputs and outputs, although it must
have at least one input or output. |
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 DEFINE_WRAPPERTYPEINFO(); | 48 DEFINE_WRAPPERTYPEINFO(); |
49 public: | 49 public: |
50 // bufferSize must be one of the following values: 256, 512, 1024, 2048, 409
6, 8192, 16384. | 50 // bufferSize must be one of the following values: 256, 512, 1024, 2048, 409
6, 8192, 16384. |
51 // This value controls how frequently the onaudioprocess event handler is ca
lled and how many sample-frames need to be processed each call. | 51 // This value controls how frequently the onaudioprocess event handler is ca
lled and how many sample-frames need to be processed each call. |
52 // Lower numbers for bufferSize will result in a lower (better) latency. Hig
her numbers will be necessary to avoid audio breakup and glitches. | 52 // Lower numbers for bufferSize will result in a lower (better) latency. Hig
her numbers will be necessary to avoid audio breakup and glitches. |
53 // The value chosen must carefully balance between latency and audio quality
. | 53 // The value chosen must carefully balance between latency and audio quality
. |
54 static ScriptProcessorNode* create(AudioContext*, float sampleRate, size_t b
ufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels); | 54 static ScriptProcessorNode* create(AudioContext*, float sampleRate, size_t b
ufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels); |
55 | 55 |
56 virtual ~ScriptProcessorNode(); | 56 virtual ~ScriptProcessorNode(); |
57 | 57 |
58 // AudioNode | 58 // AudioNode |
59 virtual void dispose() OVERRIDE; | 59 virtual void dispose() override; |
60 virtual void process(size_t framesToProcess) OVERRIDE; | 60 virtual void process(size_t framesToProcess) override; |
61 virtual void initialize() OVERRIDE; | 61 virtual void initialize() override; |
62 virtual void uninitialize() OVERRIDE; | 62 virtual void uninitialize() override; |
63 | 63 |
64 size_t bufferSize() const { return m_bufferSize; } | 64 size_t bufferSize() const { return m_bufferSize; } |
65 | 65 |
66 virtual void setChannelCount(unsigned long, ExceptionState&) OVERRIDE; | 66 virtual void setChannelCount(unsigned long, ExceptionState&) override; |
67 virtual void setChannelCountMode(const String&, ExceptionState&) OVERRIDE; | 67 virtual void setChannelCountMode(const String&, ExceptionState&) override; |
68 | 68 |
69 DEFINE_ATTRIBUTE_EVENT_LISTENER(audioprocess); | 69 DEFINE_ATTRIBUTE_EVENT_LISTENER(audioprocess); |
70 | 70 |
71 void trace(Visitor*); | 71 void trace(Visitor*); |
72 | 72 |
73 private: | 73 private: |
74 virtual double tailTime() const OVERRIDE; | 74 virtual double tailTime() const override; |
75 virtual double latencyTime() const OVERRIDE; | 75 virtual double latencyTime() const override; |
76 | 76 |
77 ScriptProcessorNode(AudioContext*, float sampleRate, size_t bufferSize, unsi
gned numberOfInputChannels, unsigned numberOfOutputChannels); | 77 ScriptProcessorNode(AudioContext*, float sampleRate, size_t bufferSize, unsi
gned numberOfInputChannels, unsigned numberOfOutputChannels); |
78 | 78 |
79 void fireProcessEvent(); | 79 void fireProcessEvent(); |
80 | 80 |
81 // Double buffering | 81 // Double buffering |
82 unsigned doubleBufferIndex() const { return m_doubleBufferIndex; } | 82 unsigned doubleBufferIndex() const { return m_doubleBufferIndex; } |
83 void swapBuffers() { m_doubleBufferIndex = 1 - m_doubleBufferIndex; } | 83 void swapBuffers() { m_doubleBufferIndex = 1 - m_doubleBufferIndex; } |
84 unsigned m_doubleBufferIndex; | 84 unsigned m_doubleBufferIndex; |
85 unsigned m_doubleBufferIndexForEvent; | 85 unsigned m_doubleBufferIndexForEvent; |
86 HeapVector<Member<AudioBuffer> > m_inputBuffers; | 86 HeapVector<Member<AudioBuffer> > m_inputBuffers; |
87 HeapVector<Member<AudioBuffer> > m_outputBuffers; | 87 HeapVector<Member<AudioBuffer> > m_outputBuffers; |
88 | 88 |
89 size_t m_bufferSize; | 89 size_t m_bufferSize; |
90 unsigned m_bufferReadWriteIndex; | 90 unsigned m_bufferReadWriteIndex; |
91 | 91 |
92 unsigned m_numberOfInputChannels; | 92 unsigned m_numberOfInputChannels; |
93 unsigned m_numberOfOutputChannels; | 93 unsigned m_numberOfOutputChannels; |
94 | 94 |
95 RefPtr<AudioBus> m_internalInputBus; | 95 RefPtr<AudioBus> m_internalInputBus; |
96 // Synchronize process() with fireProcessEvent(). | 96 // Synchronize process() with fireProcessEvent(). |
97 mutable Mutex m_processEventLock; | 97 mutable Mutex m_processEventLock; |
98 }; | 98 }; |
99 | 99 |
100 } // namespace blink | 100 } // namespace blink |
101 | 101 |
102 #endif // ScriptProcessorNode_h | 102 #endif // ScriptProcessorNode_h |
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