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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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45 #include "wtf/Threading.h" | 45 #include "wtf/Threading.h" |
46 #include "wtf/Vector.h" | 46 #include "wtf/Vector.h" |
47 #include "wtf/build_config.h" | 47 #include "wtf/build_config.h" |
48 | 48 |
49 namespace blink { | 49 namespace blink { |
50 | 50 |
51 class AnalyserNode; | 51 class AnalyserNode; |
52 class AudioBuffer; | 52 class AudioBuffer; |
53 class AudioBufferCallback; | 53 class AudioBufferCallback; |
54 class AudioBufferSourceNode; | 54 class AudioBufferSourceNode; |
| 55 class AudioContextOptions; |
55 class AudioListener; | 56 class AudioListener; |
56 class BaseAudioContextTest; | 57 class BaseAudioContextTest; |
57 class BiquadFilterNode; | 58 class BiquadFilterNode; |
58 class ChannelMergerNode; | 59 class ChannelMergerNode; |
59 class ChannelSplitterNode; | 60 class ChannelSplitterNode; |
60 class ConstantSourceNode; | 61 class ConstantSourceNode; |
61 class ConvolverNode; | 62 class ConvolverNode; |
62 class DelayNode; | 63 class DelayNode; |
63 class Document; | 64 class Document; |
64 class DynamicsCompressorNode; | 65 class DynamicsCompressorNode; |
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93 | 94 |
94 public: | 95 public: |
95 // The state of an audio context. On creation, the state is Suspended. The | 96 // The state of an audio context. On creation, the state is Suspended. The |
96 // state is Running if audio is being processed (audio graph is being pulled | 97 // state is Running if audio is being processed (audio graph is being pulled |
97 // for data). The state is Closed if the audio context has been closed. The | 98 // for data). The state is Closed if the audio context has been closed. The |
98 // valid transitions are from Suspended to either Running or Closed; Running | 99 // valid transitions are from Suspended to either Running or Closed; Running |
99 // to Suspended or Closed. Once Closed, there are no valid transitions. | 100 // to Suspended or Closed. Once Closed, there are no valid transitions. |
100 enum AudioContextState { Suspended, Running, Closed }; | 101 enum AudioContextState { Suspended, Running, Closed }; |
101 | 102 |
102 // Create an AudioContext for rendering to the audio hardware. | 103 // Create an AudioContext for rendering to the audio hardware. |
103 static BaseAudioContext* create(Document&, ExceptionState&); | 104 static BaseAudioContext* create(Document&, |
| 105 const AudioContextOptions&, |
| 106 ExceptionState&); |
104 | 107 |
105 ~BaseAudioContext() override; | 108 ~BaseAudioContext() override; |
106 | 109 |
107 DECLARE_VIRTUAL_TRACE(); | 110 DECLARE_VIRTUAL_TRACE(); |
108 | 111 |
109 // Is the destination node initialized and ready to handle audio? | 112 // Is the destination node initialized and ready to handle audio? |
110 bool isDestinationInitialized() const { | 113 bool isDestinationInitialized() const { |
111 AudioDestinationNode* dest = destination(); | 114 AudioDestinationNode* dest = destination(); |
112 return dest ? dest->audioDestinationHandler().isInitialized() : false; | 115 return dest ? dest->audioDestinationHandler().isInitialized() : false; |
113 } | 116 } |
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130 | 133 |
131 double currentTime() const { | 134 double currentTime() const { |
132 // TODO: What is the correct value for the current time if the destination | 135 // TODO: What is the correct value for the current time if the destination |
133 // node has gone away? 0 is a valid time. | 136 // node has gone away? 0 is a valid time. |
134 return m_destinationNode | 137 return m_destinationNode |
135 ? m_destinationNode->audioDestinationHandler().currentTime() | 138 ? m_destinationNode->audioDestinationHandler().currentTime() |
136 : 0; | 139 : 0; |
137 } | 140 } |
138 | 141 |
139 float sampleRate() const { | 142 float sampleRate() const { |
140 return m_destinationNode ? m_destinationNode->handler().sampleRate() : 0; | 143 return m_destinationNode |
| 144 ? m_destinationNode->audioDestinationHandler().sampleRate() |
| 145 : closedContextSampleRate(); |
| 146 } |
| 147 |
| 148 float framesPerBuffer() const { |
| 149 return m_destinationNode |
| 150 ? m_destinationNode->audioDestinationHandler().framesPerBuffer() |
| 151 : 0; |
141 } | 152 } |
142 | 153 |
143 String state() const; | 154 String state() const; |
144 AudioContextState contextState() const { return m_contextState; } | 155 AudioContextState contextState() const { return m_contextState; } |
145 void throwExceptionForClosedState(ExceptionState&); | 156 void throwExceptionForClosedState(ExceptionState&); |
146 | 157 |
147 AudioBuffer* createBuffer(unsigned numberOfChannels, | 158 AudioBuffer* createBuffer(unsigned numberOfChannels, |
148 size_t numberOfFrames, | 159 size_t numberOfFrames, |
149 float sampleRate, | 160 float sampleRate, |
150 ExceptionState&); | 161 ExceptionState&); |
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447 // This is considering 32 is large enough for multiple channels audio. | 458 // This is considering 32 is large enough for multiple channels audio. |
448 // It is somewhat arbitrary and could be increased if necessary. | 459 // It is somewhat arbitrary and could be increased if necessary. |
449 enum { MaxNumberOfChannels = 32 }; | 460 enum { MaxNumberOfChannels = 32 }; |
450 | 461 |
451 Optional<AutoplayStatus> m_autoplayStatus; | 462 Optional<AutoplayStatus> m_autoplayStatus; |
452 }; | 463 }; |
453 | 464 |
454 } // namespace blink | 465 } // namespace blink |
455 | 466 |
456 #endif // BaseAudioContext_h | 467 #endif // BaseAudioContext_h |
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