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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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70 class PannerNode; | 70 class PannerNode; |
71 class PeriodicWave; | 71 class PeriodicWave; |
72 class ScriptProcessorNode; | 72 class ScriptProcessorNode; |
73 class SecurityOrigin; | 73 class SecurityOrigin; |
74 class StereoPannerNode; | 74 class StereoPannerNode; |
75 class WaveShaperNode; | 75 class WaveShaperNode; |
76 | 76 |
77 // AudioContext is the cornerstone of the web audio API and all AudioNodes are c
reated from it. | 77 // AudioContext is the cornerstone of the web audio API and all AudioNodes are c
reated from it. |
78 // For thread safety between the audio thread and the main thread, it has a rend
ering graph locking mechanism. | 78 // For thread safety between the audio thread and the main thread, it has a rend
ering graph locking mechanism. |
79 | 79 |
80 class AudioContext : public RefCountedGarbageCollectedEventTargetWithInlineData<
AudioContext>, public ActiveDOMObject { | 80 class AudioContext |
| 81 : public RefCountedGarbageCollectedEventTargetWithInlineData<AudioContext> |
| 82 , public ActiveDOMObject |
| 83 , private ThreadState::MarkingTask { |
81 DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollected<A
udioContext>); | 84 DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollected<A
udioContext>); |
82 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AudioContext); | 85 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AudioContext); |
83 DEFINE_WRAPPERTYPEINFO(); | 86 DEFINE_WRAPPERTYPEINFO(); |
84 public: | 87 public: |
85 // The state of an audio context. On creation, the state is Suspended. The
state is Running if | 88 // The state of an audio context. On creation, the state is Suspended. The
state is Running if |
86 // audio is being processed (audio graph is being pulled for data). The stat
e is Closed if the | 89 // audio is being processed (audio graph is being pulled for data). The stat
e is Closed if the |
87 // audio context has been closed. The valid transitions are from Suspended
to either Running or | 90 // audio context has been closed. The valid transitions are from Suspended
to either Running or |
88 // Closed; Running to Suspended or Closed. Once Closed, there are no valid t
ransitions. | 91 // Closed; Running to Suspended or Closed. Once Closed, there are no valid t
ransitions. |
89 enum AudioContextState { | 92 enum AudioContextState { |
90 Suspended, | 93 Suspended, |
91 Running, | 94 Running, |
92 Closed | 95 Closed |
93 }; | 96 }; |
94 | 97 |
95 // Create an AudioContext for rendering to the audio hardware. | 98 // Create an AudioContext for rendering to the audio hardware. |
96 static AudioContext* create(Document&, ExceptionState&); | 99 static AudioContext* create(Document&, ExceptionState&); |
97 | 100 |
98 virtual ~AudioContext(); | 101 virtual ~AudioContext(); |
99 | 102 |
100 virtual void trace(Visitor*) override; | 103 virtual void trace(Visitor*) override; |
101 | 104 |
102 bool isInitialized() const { return m_isInitialized; } | 105 bool isInitialized() const { return m_isInitialized; } |
103 bool isOfflineContext() { return m_isOfflineContext; } | 106 bool isOfflineContext() { return m_isOfflineContext; } |
| 107 AudioContextState contextState() const { return m_contextState; } |
| 108 void setLastZombie(void*); |
104 | 109 |
105 // Document notification | 110 // Document notification |
106 virtual void stop() override final; | 111 virtual void stop() override final; |
107 virtual bool hasPendingActivity() const override; | 112 virtual bool hasPendingActivity() const override; |
108 | 113 |
109 AudioDestinationNode* destination() { return m_destinationNode.get(); } | 114 AudioDestinationNode* destination() { return m_destinationNode.get(); } |
110 // currentSampleFrame() returns the current sample frame. It should only be
called from the | 115 // currentSampleFrame() returns the current sample frame. It should only be
called from the |
111 // audio thread. | 116 // audio thread. |
112 size_t currentSampleFrame() const { return m_destinationNode->currentSampleF
rame(); } | 117 size_t currentSampleFrame() const { return m_destinationNode->currentSampleF
rame(); } |
113 // cachedSampleFrame() is like currentSampleFrame() but must be called from
the main thread to | 118 // cachedSampleFrame() is like currentSampleFrame() but must be called from
the main thread to |
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273 | 278 |
274 protected: | 279 protected: |
275 explicit AudioContext(Document*); | 280 explicit AudioContext(Document*); |
276 AudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, fl
oat sampleRate); | 281 AudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, fl
oat sampleRate); |
277 | 282 |
278 RefPtrWillBeMember<ScriptPromiseResolver> m_offlineResolver; | 283 RefPtrWillBeMember<ScriptPromiseResolver> m_offlineResolver; |
279 private: | 284 private: |
280 void initialize(); | 285 void initialize(); |
281 void uninitialize(); | 286 void uninitialize(); |
282 | 287 |
| 288 // ThreadState::MarkingTask functions. |
| 289 void willStartMarking(ThreadState&) override; |
| 290 void didFinishMarking(ThreadState&) override; |
| 291 |
283 // ExecutionContext calls stop twice. | 292 // ExecutionContext calls stop twice. |
284 // We'd like to schedule only one stop action for them. | 293 // We'd like to schedule only one stop action for them. |
285 bool m_isStopScheduled; | 294 bool m_isStopScheduled; |
286 bool m_isCleared; | 295 bool m_isCleared; |
287 void clear(); | 296 void clear(); |
288 | 297 |
289 // Set to true when the destination node has been initialized and is ready t
o process data. | 298 // Set to true when the destination node has been initialized and is ready t
o process data. |
290 bool m_isInitialized; | 299 bool m_isInitialized; |
291 | 300 |
292 void derefNode(AudioNode*); | 301 void derefNode(AudioNode*); |
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380 // m_automaticPullNodesNeedUpdating keeps track if m_automaticPullNodes is m
odified. | 389 // m_automaticPullNodesNeedUpdating keeps track if m_automaticPullNodes is m
odified. |
381 bool m_automaticPullNodesNeedUpdating; | 390 bool m_automaticPullNodesNeedUpdating; |
382 void updateAutomaticPullNodes(); | 391 void updateAutomaticPullNodes(); |
383 | 392 |
384 unsigned m_connectionCount; | 393 unsigned m_connectionCount; |
385 | 394 |
386 // Graph locking. | 395 // Graph locking. |
387 bool m_didInitializeContextGraphMutex; | 396 bool m_didInitializeContextGraphMutex; |
388 RecursiveMutex m_contextGraphMutex; | 397 RecursiveMutex m_contextGraphMutex; |
389 volatile ThreadIdentifier m_audioThread; | 398 volatile ThreadIdentifier m_audioThread; |
| 399 // Accessing m_last*Zombie should be protected by |
| 400 // m_didInitializeContextGraphMutex. |
| 401 void* m_lastZombie; |
| 402 void* m_lastRemovableZombie; |
390 | 403 |
391 // Only accessed in the audio thread. | 404 // Only accessed in the audio thread. |
392 // Oilpan: Since items are added to these vectors by the audio thread (not r
egistered to Oilpan), | 405 // Oilpan: Since items are added to these vectors by the audio thread (not r
egistered to Oilpan), |
393 // we cannot use HeapVectors. | 406 // we cannot use HeapVectors. |
394 GC_PLUGIN_IGNORE("http://crbug.com/404527") | 407 GC_PLUGIN_IGNORE("http://crbug.com/404527") |
395 Vector<AudioNode*> m_deferredBreakConnectionList; | 408 Vector<AudioNode*> m_deferredBreakConnectionList; |
396 | 409 |
397 Member<AudioBuffer> m_renderTarget; | 410 Member<AudioBuffer> m_renderTarget; |
398 | 411 |
399 bool m_isOfflineContext; | 412 bool m_isOfflineContext; |
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417 void handleStoppableSourceNodes(); | 430 void handleStoppableSourceNodes(); |
418 | 431 |
419 // This is considering 32 is large enough for multiple channels audio. | 432 // This is considering 32 is large enough for multiple channels audio. |
420 // It is somewhat arbitrary and could be increased if necessary. | 433 // It is somewhat arbitrary and could be increased if necessary. |
421 enum { MaxNumberOfChannels = 32 }; | 434 enum { MaxNumberOfChannels = 32 }; |
422 }; | 435 }; |
423 | 436 |
424 } // namespace blink | 437 } // namespace blink |
425 | 438 |
426 #endif // AudioContext_h | 439 #endif // AudioContext_h |
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