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/*
* 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 Computer, 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_PERIODIC_WAVE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_PERIODIC_WAVE_H_
#include <memory>
#include "third_party/blink/renderer/core/typed_arrays/array_buffer_view_helpers.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_typed_array.h"
#include "third_party/blink/renderer/platform/audio/audio_array.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class BaseAudioContext;
class ExceptionState;
class PeriodicWaveOptions;
class PeriodicWave final : public ScriptWrappable {
DEFINE_WRAPPERTYPEINFO();
public:
static PeriodicWave* CreateSine(float sample_rate);
static PeriodicWave* CreateSquare(float sample_rate);
static PeriodicWave* CreateSawtooth(float sample_rate);
static PeriodicWave* CreateTriangle(float sample_rate);
// Creates an arbitrary periodic wave given the frequency components (Fourier
// coefficients).
static PeriodicWave* Create(BaseAudioContext&,
const Vector<float>& real,
const Vector<float>& imag,
bool normalize,
ExceptionState&);
static PeriodicWave* Create(BaseAudioContext*,
const PeriodicWaveOptions*,
ExceptionState&);
explicit PeriodicWave(float sample_rate);
~PeriodicWave() override;
// 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*& lower_wave_data,
float*& higher_wave_data,
float& table_interpolation_factor);
// Like the above, except we compute accept 4 frequencies at a time and return
// 4 lower/higher wave data tables and the 4 corresponding table interpolation
// factors. Intended for use with the OscillatorNode for faster a-rate
// processing.
void WaveDataForFundamentalFrequency(const float fundamental_frequency[4],
float* lower_wave_data[4],
float* higher_wave_data[4],
float table_interpolation_factor[4]);
// Returns the scalar multiplier to the oscillator frequency to calculate wave
// buffer phase increment.
float RateScale() const { return rate_scale_; }
// The size of the FFT to use based on the sampling rate.
unsigned PeriodicWaveSize() const;
// The number of ranges needed for the given sampling rate and FFT size.
unsigned NumberOfRanges() const { return number_of_ranges_; }
private:
void GenerateBasicWaveform(int);
size_t v8_external_memory_;
float sample_rate_;
unsigned number_of_ranges_;
float cents_per_range_;
// 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 lowest_fundamental_frequency_;
float rate_scale_;
// Maximum possible number of partials (before culling).
unsigned MaxNumberOfPartials() const;
unsigned NumberOfPartialsForRange(unsigned range_index) const;
void AdjustV8ExternalMemory(int64_t delta);
// Creates tables based on numberOfComponents Fourier coefficients.
void CreateBandLimitedTables(const float* real,
const float* imag,
unsigned number_of_components,
bool disable_normalization);
Vector<std::unique_ptr<AudioFloatArray>> band_limited_tables_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_PERIODIC_WAVE_H_
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