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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 | 37 |
38 namespace blink { | 38 namespace blink { |
39 | 39 |
40 class AudioContext; | 40 class AudioContext; |
41 | 41 |
42 // AudioBufferSourceNode is an AudioNode representing an audio source from an in
-memory audio asset represented by an AudioBuffer. | 42 // AudioBufferSourceNode is an AudioNode representing an audio source from an in
-memory audio asset represented by an AudioBuffer. |
43 // It generally will be used for short sounds which require a high degree of sch
eduling flexibility (can playback in rhythmically perfect ways). | 43 // It generally will be used for short sounds which require a high degree of sch
eduling flexibility (can playback in rhythmically perfect ways). |
44 | 44 |
45 class AudioBufferSourceNode FINAL : public AudioScheduledSourceNode { | 45 class AudioBufferSourceNode FINAL : public AudioScheduledSourceNode { |
46 public: | 46 public: |
47 static PassRefPtrWillBeRawPtr<AudioBufferSourceNode> create(AudioContext*, f
loat sampleRate); | 47 static AudioBufferSourceNode* create(AudioContext*, float sampleRate); |
48 | 48 |
49 virtual ~AudioBufferSourceNode(); | 49 virtual ~AudioBufferSourceNode(); |
50 | 50 |
51 // AudioNode | 51 // AudioNode |
52 virtual void dispose() OVERRIDE; | 52 virtual void dispose() OVERRIDE; |
53 virtual void process(size_t framesToProcess) OVERRIDE; | 53 virtual void process(size_t framesToProcess) OVERRIDE; |
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(); } |
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95 private: | 95 private: |
96 AudioBufferSourceNode(AudioContext*, float sampleRate); | 96 AudioBufferSourceNode(AudioContext*, float sampleRate); |
97 | 97 |
98 // Returns true on success. | 98 // Returns true on success. |
99 bool renderFromBuffer(AudioBus*, unsigned destinationFrameOffset, size_t num
berOfFrames); | 99 bool renderFromBuffer(AudioBus*, unsigned destinationFrameOffset, size_t num
berOfFrames); |
100 | 100 |
101 // Render silence starting from "index" frame in AudioBus. | 101 // Render silence starting from "index" frame in AudioBus. |
102 inline bool renderSilenceAndFinishIfNotLooping(AudioBus*, unsigned index, si
ze_t framesToProcess); | 102 inline bool renderSilenceAndFinishIfNotLooping(AudioBus*, unsigned index, si
ze_t framesToProcess); |
103 | 103 |
104 // m_buffer holds the sample data which this node outputs. | 104 // m_buffer holds the sample data which this node outputs. |
105 RefPtrWillBeMember<AudioBuffer> m_buffer; | 105 Member<AudioBuffer> m_buffer; |
106 | 106 |
107 // Pointers for the buffer and destination. | 107 // Pointers for the buffer and destination. |
108 OwnPtr<const float*[]> m_sourceChannels; | 108 OwnPtr<const float*[]> m_sourceChannels; |
109 OwnPtr<float*[]> m_destinationChannels; | 109 OwnPtr<float*[]> m_destinationChannels; |
110 | 110 |
111 // Used for the "playbackRate" attributes. | 111 // Used for the "playbackRate" attributes. |
112 RefPtrWillBeMember<AudioParam> m_playbackRate; | 112 Member<AudioParam> m_playbackRate; |
113 | 113 |
114 // If m_isLooping is false, then this node will be done playing and become i
nactive after it reaches the end of the sample data in the buffer. | 114 // If m_isLooping is false, then this node will be done playing and become i
nactive after it reaches the end of the sample data in the buffer. |
115 // If true, it will wrap around to the start of the buffer each time it reac
hes the end. | 115 // If true, it will wrap around to the start of the buffer each time it reac
hes the end. |
116 bool m_isLooping; | 116 bool m_isLooping; |
117 | 117 |
118 double m_loopStart; | 118 double m_loopStart; |
119 double m_loopEnd; | 119 double m_loopEnd; |
120 | 120 |
121 // m_virtualReadIndex is a sample-frame index into our buffer representing t
he current playback position. | 121 // m_virtualReadIndex is a sample-frame index into our buffer representing t
he current playback position. |
122 // Since it's floating-point, it has sub-sample accuracy. | 122 // Since it's floating-point, it has sub-sample accuracy. |
123 double m_virtualReadIndex; | 123 double m_virtualReadIndex; |
124 | 124 |
125 // Granular playback | 125 // Granular playback |
126 bool m_isGrain; | 126 bool m_isGrain; |
127 double m_grainOffset; // in seconds | 127 double m_grainOffset; // in seconds |
128 double m_grainDuration; // in seconds | 128 double m_grainDuration; // in seconds |
129 | 129 |
130 // totalPitchRate() returns the instantaneous pitch rate (non-time preservin
g). | 130 // totalPitchRate() returns the instantaneous pitch rate (non-time preservin
g). |
131 // It incorporates the base pitch rate, any sample-rate conversion factor fr
om the buffer, and any doppler shift from an associated panner node. | 131 // It incorporates the base pitch rate, any sample-rate conversion factor fr
om the buffer, and any doppler shift from an associated panner node. |
132 double totalPitchRate(); | 132 double totalPitchRate(); |
133 | 133 |
134 // We optionally keep track of a panner node which has a doppler shift that | 134 // We optionally keep track of a panner node which has a doppler shift that |
135 // is incorporated into the pitch rate. | 135 // is incorporated into the pitch rate. |
136 // This RefPtr is connection reference. We must call AudioNode:: | 136 // This RefPtr is connection reference. We must call AudioNode:: |
137 // makeConnection() after ref(), and call AudioNode::breakConnection() | 137 // makeConnection() after ref(), and call AudioNode::breakConnection() |
138 // before deref(). | 138 // before deref(). |
139 // Oilpan: This holds connection references. We must call | 139 // Oilpan: This holds connection references. We must call |
140 // AudioNode::makeConnection when we add an AudioNode to this, and must call | 140 // AudioNode::makeConnection when we add an AudioNode to this, and must call |
141 // AudioNode::breakConnection() when we remove an AudioNode from this. | 141 // AudioNode::breakConnection() when we remove an AudioNode from this. |
142 RefPtrWillBeMember<PannerNode> m_pannerNode; | 142 Member<PannerNode> m_pannerNode; |
143 | 143 |
144 // 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. |
145 mutable Mutex m_processLock; | 145 mutable Mutex m_processLock; |
146 }; | 146 }; |
147 | 147 |
148 } // namespace blink | 148 } // namespace blink |
149 | 149 |
150 #endif // AudioBufferSourceNode_h | 150 #endif // AudioBufferSourceNode_h |
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