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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 |
| (...skipping 22 matching lines...) Expand all Loading... |
| 33 #include "wtf/RefPtr.h" | 33 #include "wtf/RefPtr.h" |
| 34 #include "wtf/Threading.h" | 34 #include "wtf/Threading.h" |
| 35 | 35 |
| 36 namespace blink { | 36 namespace blink { |
| 37 | 37 |
| 38 class AudioContext; | 38 class AudioContext; |
| 39 class PeriodicWave; | 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 FINAL : public AudioScheduledSourceNode { | 43 class OscillatorNode final : public AudioScheduledSourceNode { |
| 44 DEFINE_WRAPPERTYPEINFO(); | 44 DEFINE_WRAPPERTYPEINFO(); |
| 45 public: | 45 public: |
| 46 // The waveform type. | 46 // The waveform type. |
| 47 // These must be defined as in the .idl file. | 47 // These must be defined as in the .idl file. |
| 48 enum { | 48 enum { |
| 49 SINE = 0, | 49 SINE = 0, |
| 50 SQUARE = 1, | 50 SQUARE = 1, |
| 51 SAWTOOTH = 2, | 51 SAWTOOTH = 2, |
| 52 TRIANGLE = 3, | 52 TRIANGLE = 3, |
| 53 CUSTOM = 4 | 53 CUSTOM = 4 |
| 54 }; | 54 }; |
| 55 | 55 |
| 56 static OscillatorNode* create(AudioContext*, float sampleRate); | 56 static OscillatorNode* create(AudioContext*, float sampleRate); |
| 57 | 57 |
| 58 virtual ~OscillatorNode(); | 58 virtual ~OscillatorNode(); |
| 59 | 59 |
| 60 // AudioNode | 60 // AudioNode |
| 61 virtual void dispose() OVERRIDE; | 61 virtual void dispose() override; |
| 62 virtual void process(size_t framesToProcess) OVERRIDE; | 62 virtual void process(size_t framesToProcess) override; |
| 63 | 63 |
| 64 String type() const; | 64 String type() const; |
| 65 | 65 |
| 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 setPeriodicWave(PeriodicWave*); | 71 void setPeriodicWave(PeriodicWave*); |
| 72 | 72 |
| 73 virtual void trace(Visitor*) OVERRIDE; | 73 virtual void trace(Visitor*) override; |
| 74 | 74 |
| 75 private: | 75 private: |
| 76 OscillatorNode(AudioContext*, float sampleRate); | 76 OscillatorNode(AudioContext*, float sampleRate); |
| 77 | 77 |
| 78 bool setType(unsigned); // Returns true on success. | 78 bool setType(unsigned); // Returns true on success. |
| 79 | 79 |
| 80 // Returns true if there are sample-accurate timeline parameter changes. | 80 // Returns true if there are sample-accurate timeline parameter changes. |
| 81 bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess); | 81 bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess); |
| 82 | 82 |
| 83 virtual bool propagatesSilence() const OVERRIDE; | 83 virtual bool propagatesSilence() const override; |
| 84 | 84 |
| 85 // One of the waveform types defined in the enum. | 85 // One of the waveform types defined in the enum. |
| 86 unsigned short m_type; | 86 unsigned short m_type; |
| 87 | 87 |
| 88 // Frequency value in Hertz. | 88 // Frequency value in Hertz. |
| 89 Member<AudioParam> m_frequency; | 89 Member<AudioParam> m_frequency; |
| 90 | 90 |
| 91 // Detune value (deviating from the frequency) in Cents. | 91 // Detune value (deviating from the frequency) in Cents. |
| 92 Member<AudioParam> m_detune; | 92 Member<AudioParam> m_detune; |
| 93 | 93 |
| 94 bool m_firstRender; | 94 bool m_firstRender; |
| 95 | 95 |
| 96 // m_virtualReadIndex is a sample-frame index into our buffer representing t
he current playback position. | 96 // m_virtualReadIndex is a sample-frame index into our buffer representing t
he current playback position. |
| 97 // Since it's floating-point, it has sub-sample accuracy. | 97 // Since it's floating-point, it has sub-sample accuracy. |
| 98 double m_virtualReadIndex; | 98 double m_virtualReadIndex; |
| 99 | 99 |
| 100 // This synchronizes process(). | 100 // This synchronizes process(). |
| 101 mutable Mutex m_processLock; | 101 mutable Mutex m_processLock; |
| 102 | 102 |
| 103 // Stores sample-accurate values calculated according to frequency and detun
e. | 103 // Stores sample-accurate values calculated according to frequency and detun
e. |
| 104 AudioFloatArray m_phaseIncrements; | 104 AudioFloatArray m_phaseIncrements; |
| 105 AudioFloatArray m_detuneValues; | 105 AudioFloatArray m_detuneValues; |
| 106 | 106 |
| 107 Member<PeriodicWave> m_periodicWave; | 107 Member<PeriodicWave> m_periodicWave; |
| 108 }; | 108 }; |
| 109 | 109 |
| 110 } // namespace blink | 110 } // namespace blink |
| 111 | 111 |
| 112 #endif // OscillatorNode_h | 112 #endif // OscillatorNode_h |
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