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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 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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33 #include "platform/audio/AudioArray.h" | 33 #include "platform/audio/AudioArray.h" |
34 #include "wtf/Float32Array.h" | 34 #include "wtf/Float32Array.h" |
35 #include "wtf/OwnPtr.h" | 35 #include "wtf/OwnPtr.h" |
36 #include "wtf/PassRefPtr.h" | 36 #include "wtf/PassRefPtr.h" |
37 #include "wtf/RefCounted.h" | 37 #include "wtf/RefCounted.h" |
38 #include "wtf/RefPtr.h" | 38 #include "wtf/RefPtr.h" |
39 #include "wtf/Vector.h" | 39 #include "wtf/Vector.h" |
40 | 40 |
41 namespace WebCore { | 41 namespace WebCore { |
42 | 42 |
43 class PeriodicWave : public ScriptWrappable, public RefCounted<PeriodicWave> { | 43 class PeriodicWave : public RefCountedWillBeGarbageCollectedFinalized<PeriodicWa
ve>, public ScriptWrappable { |
44 public: | 44 public: |
45 static PassRefPtr<PeriodicWave> createSine(float sampleRate); | 45 static PassRefPtrWillBeRawPtr<PeriodicWave> createSine(float sampleRate); |
46 static PassRefPtr<PeriodicWave> createSquare(float sampleRate); | 46 static PassRefPtrWillBeRawPtr<PeriodicWave> createSquare(float sampleRate); |
47 static PassRefPtr<PeriodicWave> createSawtooth(float sampleRate); | 47 static PassRefPtrWillBeRawPtr<PeriodicWave> createSawtooth(float sampleRate)
; |
48 static PassRefPtr<PeriodicWave> createTriangle(float sampleRate); | 48 static PassRefPtrWillBeRawPtr<PeriodicWave> createTriangle(float sampleRate)
; |
49 | 49 |
50 // Creates an arbitrary periodic wave given the frequency components (Fourie
r coefficients). | 50 // Creates an arbitrary periodic wave given the frequency components (Fourie
r coefficients). |
51 static PassRefPtr<PeriodicWave> create(float sampleRate, Float32Array* real,
Float32Array* imag); | 51 static PassRefPtrWillBeRawPtr<PeriodicWave> create(float sampleRate, Float32
Array* real, Float32Array* imag); |
52 | 52 |
53 // Returns pointers to the lower and higher wave data for the pitch range co
ntaining | 53 // Returns pointers to the lower and higher wave data for the pitch range co
ntaining |
54 // the given fundamental frequency. These two tables are in adjacent "pitch"
ranges | 54 // the given fundamental frequency. These two tables are in adjacent "pitch"
ranges |
55 // where the higher table will have the maximum number of partials which won
't alias when played back | 55 // where the higher table will have the maximum number of partials which won
't alias when played back |
56 // at this fundamental frequency. The lower wave is the next range containin
g fewer partials than the higher wave. | 56 // at this fundamental frequency. The lower wave is the next range containin
g fewer partials than the higher wave. |
57 // Interpolation between these two tables can be made according to tableInte
rpolationFactor. | 57 // Interpolation between these two tables can be made according to tableInte
rpolationFactor. |
58 // Where values from 0 -> 1 interpolate between lower -> higher. | 58 // Where values from 0 -> 1 interpolate between lower -> higher. |
59 void waveDataForFundamentalFrequency(float, float* &lowerWaveData, float* &h
igherWaveData, float& tableInterpolationFactor); | 59 void waveDataForFundamentalFrequency(float, float* &lowerWaveData, float* &h
igherWaveData, float& tableInterpolationFactor); |
60 | 60 |
61 // Returns the scalar multiplier to the oscillator frequency to calculate wa
ve buffer phase increment. | 61 // Returns the scalar multiplier to the oscillator frequency to calculate wa
ve buffer phase increment. |
62 float rateScale() const { return m_rateScale; } | 62 float rateScale() const { return m_rateScale; } |
63 | 63 |
64 unsigned periodicWaveSize() const { return m_periodicWaveSize; } | 64 unsigned periodicWaveSize() const { return m_periodicWaveSize; } |
65 | 65 |
| 66 void trace(Visitor*) { } |
| 67 |
66 private: | 68 private: |
67 explicit PeriodicWave(float sampleRate); | 69 explicit PeriodicWave(float sampleRate); |
68 | 70 |
69 void generateBasicWaveform(int); | 71 void generateBasicWaveform(int); |
70 | 72 |
71 float m_sampleRate; | 73 float m_sampleRate; |
72 unsigned m_periodicWaveSize; | 74 unsigned m_periodicWaveSize; |
73 unsigned m_numberOfRanges; | 75 unsigned m_numberOfRanges; |
74 float m_centsPerRange; | 76 float m_centsPerRange; |
75 | 77 |
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86 unsigned numberOfPartialsForRange(unsigned rangeIndex) const; | 88 unsigned numberOfPartialsForRange(unsigned rangeIndex) const; |
87 | 89 |
88 // Creates tables based on numberOfComponents Fourier coefficients. | 90 // Creates tables based on numberOfComponents Fourier coefficients. |
89 void createBandLimitedTables(const float* real, const float* imag, unsigned
numberOfComponents); | 91 void createBandLimitedTables(const float* real, const float* imag, unsigned
numberOfComponents); |
90 Vector<OwnPtr<AudioFloatArray> > m_bandLimitedTables; | 92 Vector<OwnPtr<AudioFloatArray> > m_bandLimitedTables; |
91 }; | 93 }; |
92 | 94 |
93 } // namespace WebCore | 95 } // namespace WebCore |
94 | 96 |
95 #endif // PeriodicWave_h | 97 #endif // PeriodicWave_h |
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