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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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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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