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1 /* | 1 /* |
2 * Copyright (C) 2012, Google Inc. All rights reserved. | 2 * Copyright (C) 2012, 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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29 #include "modules/webaudio/AudioParam.h" | 29 #include "modules/webaudio/AudioParam.h" |
30 #include "modules/webaudio/AudioScheduledSourceNode.h" | 30 #include "modules/webaudio/AudioScheduledSourceNode.h" |
31 #include "wtf/OwnArrayPtr.h" | 31 #include "wtf/OwnArrayPtr.h" |
32 #include "wtf/PassRefPtr.h" | 32 #include "wtf/PassRefPtr.h" |
33 #include "wtf/RefPtr.h" | 33 #include "wtf/RefPtr.h" |
34 #include "wtf/Threading.h" | 34 #include "wtf/Threading.h" |
35 | 35 |
36 namespace WebCore { | 36 namespace WebCore { |
37 | 37 |
38 class AudioContext; | 38 class AudioContext; |
39 class WaveTable; | 39 class PeriodicWave; |
40 | 40 |
41 // OscillatorNode is an audio generator of periodic waveforms. | 41 // OscillatorNode is an audio generator of periodic waveforms. |
42 | 42 |
43 class OscillatorNode : public AudioScheduledSourceNode { | 43 class OscillatorNode : public AudioScheduledSourceNode { |
44 public: | 44 public: |
45 // The waveform type. | 45 // The waveform type. |
46 // These must be defined as in the .idl file. | 46 // These must be defined as in the .idl file. |
47 enum { | 47 enum { |
48 SINE = 0, | 48 SINE = 0, |
49 SQUARE = 1, | 49 SQUARE = 1, |
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61 virtual void reset(); | 61 virtual void reset(); |
62 | 62 |
63 String type() const; | 63 String type() const; |
64 | 64 |
65 bool setType(unsigned); // Returns true on success. | 65 bool setType(unsigned); // Returns true on success. |
66 void setType(const String&); | 66 void setType(const String&); |
67 | 67 |
68 AudioParam* frequency() { return m_frequency.get(); } | 68 AudioParam* frequency() { return m_frequency.get(); } |
69 AudioParam* detune() { return m_detune.get(); } | 69 AudioParam* detune() { return m_detune.get(); } |
70 | 70 |
71 void setWaveTable(WaveTable*); | 71 void setPeriodicWave(PeriodicWave*); |
72 | 72 |
73 private: | 73 private: |
74 OscillatorNode(AudioContext*, float sampleRate); | 74 OscillatorNode(AudioContext*, float sampleRate); |
75 | 75 |
76 // Returns true if there are sample-accurate timeline parameter changes. | 76 // Returns true if there are sample-accurate timeline parameter changes. |
77 bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess); | 77 bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess); |
78 | 78 |
79 virtual bool propagatesSilence() const OVERRIDE; | 79 virtual bool propagatesSilence() const OVERRIDE; |
80 | 80 |
81 // One of the waveform types defined in the enum. | 81 // One of the waveform types defined in the enum. |
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93 // Since it's floating-point, it has sub-sample accuracy. | 93 // Since it's floating-point, it has sub-sample accuracy. |
94 double m_virtualReadIndex; | 94 double m_virtualReadIndex; |
95 | 95 |
96 // This synchronizes process(). | 96 // This synchronizes process(). |
97 mutable Mutex m_processLock; | 97 mutable Mutex m_processLock; |
98 | 98 |
99 // Stores sample-accurate values calculated according to frequency and detun
e. | 99 // Stores sample-accurate values calculated according to frequency and detun
e. |
100 AudioFloatArray m_phaseIncrements; | 100 AudioFloatArray m_phaseIncrements; |
101 AudioFloatArray m_detuneValues; | 101 AudioFloatArray m_detuneValues; |
102 | 102 |
103 RefPtr<WaveTable> m_waveTable; | 103 RefPtr<PeriodicWave> m_periodicWave; |
104 | 104 |
105 // Cache the wave tables for different waveform types, except CUSTOM. | 105 // Cache the wave tables for different waveform types, except CUSTOM. |
106 static WaveTable* s_waveTableSine; | 106 static PeriodicWave* s_periodicWaveSine; |
107 static WaveTable* s_waveTableSquare; | 107 static PeriodicWave* s_periodicWaveSquare; |
108 static WaveTable* s_waveTableSawtooth; | 108 static PeriodicWave* s_periodicWaveSawtooth; |
109 static WaveTable* s_waveTableTriangle; | 109 static PeriodicWave* s_periodicWaveTriangle; |
110 }; | 110 }; |
111 | 111 |
112 } // namespace WebCore | 112 } // namespace WebCore |
113 | 113 |
114 #endif // OscillatorNode_h | 114 #endif // OscillatorNode_h |
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