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comparison: content/media/webaudio/blink/PeriodicWave.h
content/media/webaudio/blink/PeriodicWave.h
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
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| -1:000000000000 | 0:7e98d224e986 |
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| 1 /* | |
| 2 * Copyright (C) 2012 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 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 | |
| 15 * from this software without specific prior written permission. | |
| 16 * | |
| 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 | |
| 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 | |
| 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 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 | |
| 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 | |
| 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 */ | |
| 28 | |
| 29 #ifndef PeriodicWave_h | |
| 30 #define PeriodicWave_h | |
| 31 | |
| 32 #include "mozilla/dom/OscillatorNodeBinding.h" | |
| 33 #include <nsAutoPtr.h> | |
| 34 #include <nsTArray.h> | |
| 35 #include "mozilla/MemoryReporting.h" | |
| 36 | |
| 37 namespace WebCore { | |
| 38 | |
| 39 typedef nsTArray<float> AudioFloatArray; | |
| 40 | |
| 41 class PeriodicWave { | |
| 42 public: | |
| 43 static PeriodicWave* createSine(float sampleRate); | |
| 44 static PeriodicWave* createSquare(float sampleRate); | |
| 45 static PeriodicWave* createSawtooth(float sampleRate); | |
| 46 static PeriodicWave* createTriangle(float sampleRate); | |
| 47 | |
| 48 // Creates an arbitrary periodic wave given the frequency components | |
| 49 // (Fourier coefficients). | |
| 50 static PeriodicWave* create(float sampleRate, | |
| 51 const float* real, | |
| 52 const float* imag, | |
| 53 size_t numberOfComponents); | |
| 54 | |
| 55 // Returns pointers to the lower and higher wave data for the pitch range | |
| 56 // containing the given fundamental frequency. These two tables are in | |
| 57 // adjacent "pitch" ranges where the higher table will have the maximum | |
| 58 // number of partials which won't alias when played back at this | |
| 59 // fundamental frequency. The lower wave is the next range containing fewer | |
| 60 // partials than the higher wave. Interpolation between these two tables | |
| 61 // can be made according to tableInterpolationFactor. Where values | |
| 62 // from 0 -> 1 interpolate between lower -> higher. | |
| 63 void waveDataForFundamentalFrequency(float, float* &lowerWaveData, float* &higherWaveData, float& tableInterpolationFactor); | |
| 64 | |
| 65 // Returns the scalar multiplier to the oscillator frequency to calculate | |
| 66 // wave buffer phase increment. | |
| 67 float rateScale() const { return m_rateScale; } | |
| 68 | |
| 69 unsigned periodicWaveSize() const { return m_periodicWaveSize; } | |
| 70 float sampleRate() const { return m_sampleRate; } | |
| 71 | |
| 72 size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; | |
| 73 | |
| 74 private: | |
| 75 explicit PeriodicWave(float sampleRate); | |
| 76 | |
| 77 void generateBasicWaveform(mozilla::dom::OscillatorType); | |
| 78 | |
| 79 float m_sampleRate; | |
| 80 unsigned m_periodicWaveSize; | |
| 81 unsigned m_numberOfRanges; | |
| 82 float m_centsPerRange; | |
| 83 | |
| 84 // The lowest frequency (in Hertz) where playback will include all of the | |
| 85 // partials. Playing back lower than this frequency will gradually lose | |
| 86 // more high-frequency information. | |
| 87 // This frequency is quite low (~10Hz @ // 44.1KHz) | |
| 88 float m_lowestFundamentalFrequency; | |
| 89 | |
| 90 float m_rateScale; | |
| 91 | |
| 92 unsigned numberOfRanges() const { return m_numberOfRanges; } | |
| 93 | |
| 94 // Maximum possible number of partials (before culling). | |
| 95 unsigned maxNumberOfPartials() const; | |
| 96 | |
| 97 unsigned numberOfPartialsForRange(unsigned rangeIndex) const; | |
| 98 | |
| 99 // Creates tables based on numberOfComponents Fourier coefficients. | |
| 100 void createBandLimitedTables(const float* real, const float* imag, unsigned numberOfComponents); | |
| 101 nsTArray<nsAutoPtr<AudioFloatArray> > m_bandLimitedTables; | |
| 102 }; | |
| 103 | |
| 104 } // namespace WebCore | |
| 105 | |
| 106 #endif // PeriodicWave_h |
