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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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54 | 54 |
55 // setBuffer() is called on the main thread. This is the buffer we use for p
layback. | 55 // setBuffer() is called on the main thread. This is the buffer we use for p
layback. |
56 void setBuffer(AudioBuffer*, ExceptionState&); | 56 void setBuffer(AudioBuffer*, ExceptionState&); |
57 AudioBuffer* buffer() { return m_buffer.get(); } | 57 AudioBuffer* buffer() { return m_buffer.get(); } |
58 | 58 |
59 // numberOfChannels() returns the number of output channels. This value equ
als the number of channels from the buffer. | 59 // numberOfChannels() returns the number of output channels. This value equ
als the number of channels from the buffer. |
60 // If a new buffer is set with a different number of channels, then this val
ue will dynamically change. | 60 // If a new buffer is set with a different number of channels, then this val
ue will dynamically change. |
61 unsigned numberOfChannels(); | 61 unsigned numberOfChannels(); |
62 | 62 |
63 // Play-state | 63 // Play-state |
64 void startGrain(double when, double grainOffset); | 64 void start(double when = 0); |
65 void startGrain(double when, double grainOffset, double grainDuration); | 65 void start(double when, double grainOffset); |
| 66 void start(double when, double grainOffset, double grainDuration); |
66 | 67 |
67 void noteGrainOn(double when, double grainOffset, double grainDuration); | 68 void noteGrainOn(double when, double grainOffset, double grainDuration); |
68 | 69 |
69 // Note: the attribute was originally exposed as .looping, but to be more co
nsistent in naming with <audio> | 70 // Note: the attribute was originally exposed as .looping, but to be more co
nsistent in naming with <audio> |
70 // and with how it's described in the specification, the proper attribute na
me is .loop | 71 // and with how it's described in the specification, the proper attribute na
me is .loop |
71 // The old attribute is kept for backwards compatibility. | 72 // The old attribute is kept for backwards compatibility. |
72 bool loop() const { return m_isLooping; } | 73 bool loop() const { return m_isLooping; } |
73 void setLoop(bool looping) { m_isLooping = looping; } | 74 void setLoop(bool looping) { m_isLooping = looping; } |
74 | 75 |
75 // Loop times in seconds. | 76 // Loop times in seconds. |
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87 | 88 |
88 // If we are no longer playing, propogate silence ahead to downstream nodes. | 89 // If we are no longer playing, propogate silence ahead to downstream nodes. |
89 virtual bool propagatesSilence() const; | 90 virtual bool propagatesSilence() const; |
90 | 91 |
91 // AudioScheduledSourceNode | 92 // AudioScheduledSourceNode |
92 virtual void finish() OVERRIDE; | 93 virtual void finish() OVERRIDE; |
93 | 94 |
94 private: | 95 private: |
95 AudioBufferSourceNode(AudioContext*, float sampleRate); | 96 AudioBufferSourceNode(AudioContext*, float sampleRate); |
96 | 97 |
| 98 void startPlaying(bool isGrain, double when, double grainOffset, double grai
nDuration); |
| 99 |
97 // Returns true on success. | 100 // Returns true on success. |
98 bool renderFromBuffer(AudioBus*, unsigned destinationFrameOffset, size_t num
berOfFrames); | 101 bool renderFromBuffer(AudioBus*, unsigned destinationFrameOffset, size_t num
berOfFrames); |
99 | 102 |
100 // Render silence starting from "index" frame in AudioBus. | 103 // Render silence starting from "index" frame in AudioBus. |
101 inline bool renderSilenceAndFinishIfNotLooping(AudioBus*, unsigned index, si
ze_t framesToProcess); | 104 inline bool renderSilenceAndFinishIfNotLooping(AudioBus*, unsigned index, si
ze_t framesToProcess); |
102 | 105 |
103 // m_buffer holds the sample data which this node outputs. | 106 // m_buffer holds the sample data which this node outputs. |
104 RefPtr<AudioBuffer> m_buffer; | 107 RefPtr<AudioBuffer> m_buffer; |
105 | 108 |
106 // Pointers for the buffer and destination. | 109 // Pointers for the buffer and destination. |
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138 // the pitch rate. We manually manage ref-counting because we want to use Re
fTypeConnection. | 141 // the pitch rate. We manually manage ref-counting because we want to use Re
fTypeConnection. |
139 PannerNode* m_pannerNode; | 142 PannerNode* m_pannerNode; |
140 | 143 |
141 // This synchronizes process() with setBuffer() which can cause dynamic chan
nel count changes. | 144 // This synchronizes process() with setBuffer() which can cause dynamic chan
nel count changes. |
142 mutable Mutex m_processLock; | 145 mutable Mutex m_processLock; |
143 }; | 146 }; |
144 | 147 |
145 } // namespace WebCore | 148 } // namespace WebCore |
146 | 149 |
147 #endif // AudioBufferSourceNode_h | 150 #endif // AudioBufferSourceNode_h |
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