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107 lines
4.4 KiB
C++
107 lines
4.4 KiB
C++
/*
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* Copyright (C) 2012 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PeriodicWave_h
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#define PeriodicWave_h
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#include "mozilla/dom/OscillatorNodeBinding.h"
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#include <nsAutoPtr.h>
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#include <nsTArray.h>
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#include "mozilla/MemoryReporting.h"
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namespace WebCore {
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typedef nsTArray<float> AudioFloatArray;
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class PeriodicWave {
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public:
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static PeriodicWave* createSine(float sampleRate);
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static PeriodicWave* createSquare(float sampleRate);
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static PeriodicWave* createSawtooth(float sampleRate);
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static PeriodicWave* createTriangle(float sampleRate);
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// Creates an arbitrary periodic wave given the frequency components
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// (Fourier coefficients).
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static PeriodicWave* create(float sampleRate,
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const float* real,
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const float* imag,
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size_t numberOfComponents);
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// Returns pointers to the lower and higher wave data for the pitch range
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// containing the given fundamental frequency. These two tables are in
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// adjacent "pitch" ranges where the higher table will have the maximum
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// number of partials which won't alias when played back at this
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// fundamental frequency. The lower wave is the next range containing fewer
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// partials than the higher wave. Interpolation between these two tables
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// can be made according to tableInterpolationFactor. Where values
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// from 0 -> 1 interpolate between lower -> higher.
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void waveDataForFundamentalFrequency(float, float* &lowerWaveData, float* &higherWaveData, float& tableInterpolationFactor);
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// Returns the scalar multiplier to the oscillator frequency to calculate
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// wave buffer phase increment.
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float rateScale() const { return m_rateScale; }
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unsigned periodicWaveSize() const { return m_periodicWaveSize; }
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float sampleRate() const { return m_sampleRate; }
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size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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private:
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explicit PeriodicWave(float sampleRate);
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void generateBasicWaveform(mozilla::dom::OscillatorType);
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float m_sampleRate;
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unsigned m_periodicWaveSize;
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unsigned m_numberOfRanges;
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float m_centsPerRange;
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// The lowest frequency (in Hertz) where playback will include all of the
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// partials. Playing back lower than this frequency will gradually lose
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// more high-frequency information.
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// This frequency is quite low (~10Hz @ // 44.1KHz)
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float m_lowestFundamentalFrequency;
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float m_rateScale;
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unsigned numberOfRanges() const { return m_numberOfRanges; }
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// Maximum possible number of partials (before culling).
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unsigned maxNumberOfPartials() const;
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unsigned numberOfPartialsForRange(unsigned rangeIndex) const;
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// Creates tables based on numberOfComponents Fourier coefficients.
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void createBandLimitedTables(const float* real, const float* imag, unsigned numberOfComponents);
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nsTArray<nsAutoPtr<AudioFloatArray> > m_bandLimitedTables;
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};
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} // namespace WebCore
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#endif // PeriodicWave_h
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