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Side by Side Diff: Source/modules/webaudio/PeriodicWave.h

Issue 18182009: WaveTable name has changed to PeriodicWave (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: fix global constructors test Created 7 years, 5 months ago
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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
11 * notice, this list of conditions and the following disclaimer in the 11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution. 12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived 14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission. 15 * from this software without specific prior written permission.
16 * 16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */ 27 */
28 28
29 #ifndef WaveTable_h 29 #ifndef PeriodicWave_h
30 #define WaveTable_h 30 #define PeriodicWave_h
31 31
32 #include "bindings/v8/ScriptWrappable.h" 32 #include "bindings/v8/ScriptWrappable.h"
33 #include "core/platform/audio/AudioArray.h" 33 #include "core/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 WaveTable : public ScriptWrappable, public RefCounted<WaveTable> { 43 class PeriodicWave : public ScriptWrappable, public RefCounted<PeriodicWave> {
44 public: 44 public:
45 static PassRefPtr<WaveTable> createSine(float sampleRate); 45 static PassRefPtr<PeriodicWave> createSine(float sampleRate);
46 static PassRefPtr<WaveTable> createSquare(float sampleRate); 46 static PassRefPtr<PeriodicWave> createSquare(float sampleRate);
47 static PassRefPtr<WaveTable> createSawtooth(float sampleRate); 47 static PassRefPtr<PeriodicWave> createSawtooth(float sampleRate);
48 static PassRefPtr<WaveTable> createTriangle(float sampleRate); 48 static PassRefPtr<PeriodicWave> createTriangle(float sampleRate);
49 49
50 // Creates an arbitrary wavetable given the frequency components (Fourier co efficients). 50 // Creates an arbitrary periodic wave given the frequency components (Fourie r coefficients).
51 static PassRefPtr<WaveTable> create(float sampleRate, Float32Array* real, Fl oat32Array* imag); 51 static PassRefPtr<PeriodicWave> create(float sampleRate, Float32Array* real, Float32Array* imag);
52 52
53 // Returns pointers to the lower and higher wavetable data for the pitch ran ge containing 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 wavetable is the next range cont aining fewer partials than the higher wavetable. 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 table 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 waveTableSize() const { return m_waveTableSize; } 64 unsigned periodicWaveSize() const { return m_periodicWaveSize; }
65 float sampleRate() const { return m_sampleRate; } 65 float sampleRate() const { return m_sampleRate; }
66 66
67 private: 67 private:
68 explicit WaveTable(float sampleRate); 68 explicit PeriodicWave(float sampleRate);
69 69
70 void generateBasicWaveform(int); 70 void generateBasicWaveform(int);
71 71
72 float m_sampleRate; 72 float m_sampleRate;
73 unsigned m_waveTableSize; 73 unsigned m_periodicWaveSize;
74 unsigned m_numberOfRanges; 74 unsigned m_numberOfRanges;
75 float m_centsPerRange; 75 float m_centsPerRange;
76 76
77 // The lowest frequency (in Hertz) where playback will include all of the pa rtials. 77 // The lowest frequency (in Hertz) where playback will include all of the pa rtials.
78 // Playing back lower than this frequency will gradually lose more high-freq uency information. 78 // Playing back lower than this frequency will gradually lose more high-freq uency information.
79 // This frequency is quite low (~10Hz @ 44.1KHz) 79 // This frequency is quite low (~10Hz @ 44.1KHz)
80 float m_lowestFundamentalFrequency; 80 float m_lowestFundamentalFrequency;
81 81
82 float m_rateScale; 82 float m_rateScale;
83 83
84 unsigned numberOfRanges() const { return m_numberOfRanges; } 84 unsigned numberOfRanges() const { return m_numberOfRanges; }
85 85
86 // Maximum possible number of partials (before culling). 86 // Maximum possible number of partials (before culling).
87 unsigned maxNumberOfPartials() const; 87 unsigned maxNumberOfPartials() const;
88 88
89 unsigned numberOfPartialsForRange(unsigned rangeIndex) const; 89 unsigned numberOfPartialsForRange(unsigned rangeIndex) const;
90 90
91 // Creates tables based on numberOfComponents Fourier coefficients. 91 // Creates tables based on numberOfComponents Fourier coefficients.
92 void createBandLimitedTables(const float* real, const float* imag, unsigned numberOfComponents); 92 void createBandLimitedTables(const float* real, const float* imag, unsigned numberOfComponents);
93 Vector<OwnPtr<AudioFloatArray> > m_bandLimitedTables; 93 Vector<OwnPtr<AudioFloatArray> > m_bandLimitedTables;
94 }; 94 };
95 95
96 } // namespace WebCore 96 } // namespace WebCore
97 97
98 #endif // WaveTable_h 98 #endif // PeriodicWave_h
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