107 lines
4.5 KiB
C++
107 lines
4.5 KiB
C++
/*
|
|
* Copyright (C) 2012 Google Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
|
|
* its contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "AudioArray.h"
|
|
#include "ExceptionOr.h"
|
|
#include "PeriodicWaveOptions.h"
|
|
#include <JavaScriptCore/Float32Array.h>
|
|
#include <memory>
|
|
#include <wtf/RefCounted.h>
|
|
#include <wtf/Vector.h>
|
|
|
|
namespace WebCore {
|
|
|
|
class BaseAudioContext;
|
|
|
|
enum class ShouldDisableNormalization : bool { No, Yes };
|
|
|
|
class PeriodicWave final : public RefCounted<PeriodicWave> {
|
|
public:
|
|
static Ref<PeriodicWave> createSine(float sampleRate);
|
|
static Ref<PeriodicWave> createSquare(float sampleRate);
|
|
static Ref<PeriodicWave> createSawtooth(float sampleRate);
|
|
static Ref<PeriodicWave> createTriangle(float sampleRate);
|
|
|
|
// Creates an arbitrary wave given the frequency components (Fourier coefficients).
|
|
// FIXME: Remove once old constructor is phased out
|
|
static Ref<PeriodicWave> create(float sampleRate, Float32Array& real, Float32Array& imag);
|
|
|
|
static ExceptionOr<Ref<PeriodicWave>> create(BaseAudioContext&, PeriodicWaveOptions&& = { });
|
|
|
|
// Returns pointers to the lower and higher wave data for the pitch range containing
|
|
// the given fundamental frequency. These two tables are in adjacent "pitch" ranges
|
|
// where the higher table will have the maximum number of partials which won't alias when played back
|
|
// at this fundamental frequency. The lower wave is the next range containing fewer partials than the higher wave.
|
|
// Interpolation between these two tables can be made according to tableInterpolationFactor.
|
|
// Where values from 0 -> 1 interpolate between lower -> higher.
|
|
void waveDataForFundamentalFrequency(float, float* &lowerWaveData, float* &higherWaveData, float& tableInterpolationFactor);
|
|
|
|
// Returns the scalar multiplier to the oscillator frequency to calculate wave table phase increment.
|
|
float rateScale() const { return m_rateScale; }
|
|
|
|
unsigned periodicWaveSize() const;
|
|
float sampleRate() const { return m_sampleRate; }
|
|
|
|
private:
|
|
enum class Type {
|
|
Sine,
|
|
Square,
|
|
Sawtooth,
|
|
Triangle,
|
|
};
|
|
|
|
explicit PeriodicWave(float sampleRate);
|
|
|
|
void generateBasicWaveform(Type);
|
|
|
|
float m_sampleRate;
|
|
unsigned m_numberOfRanges;
|
|
|
|
// The lowest frequency (in Hertz) where playback will include all of the partials.
|
|
// Playing back lower than this frequency will gradually lose more high-frequency information.
|
|
// This frequency is quite low (~10Hz @ 44.1KHz)
|
|
float m_lowestFundamentalFrequency;
|
|
|
|
float m_rateScale;
|
|
|
|
unsigned numberOfRanges() const { return m_numberOfRanges; }
|
|
|
|
// Maximum possible number of partials (before culling).
|
|
unsigned maxNumberOfPartials() const;
|
|
|
|
unsigned numberOfPartialsForRange(unsigned rangeIndex) const;
|
|
|
|
// Creates tables based on numberOfComponents Fourier coefficients.
|
|
void createBandLimitedTables(const float* real, const float* imag, unsigned numberOfComponents, ShouldDisableNormalization = ShouldDisableNormalization::No);
|
|
Vector<std::unique_ptr<AudioFloatArray>> m_bandLimitedTables;
|
|
};
|
|
|
|
} // namespace WebCore
|