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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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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_OSCILLATOR_NODE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_OSCILLATOR_NODE_H_
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_oscillator_options.h"
#include "third_party/blink/renderer/modules/webaudio/audio_param.h"
#include "third_party/blink/renderer/modules/webaudio/audio_scheduled_source_node.h"
#include "third_party/blink/renderer/platform/audio/audio_bus.h"
#include "third_party/blink/renderer/platform/wtf/threading.h"
namespace blink {
class BaseAudioContext;
class ExceptionState;
class OscillatorOptions;
class PeriodicWave;
// OscillatorNode is an audio generator of periodic waveforms.
class OscillatorHandler final : public AudioScheduledSourceHandler {
public:
// The waveform type.
// These must be defined as in the .idl file.
enum : uint8_t {
SINE = 0,
SQUARE = 1,
SAWTOOTH = 2,
TRIANGLE = 3,
CUSTOM = 4
};
// Breakpoints where we deicde to do linear interoplation, 3-point
// interpolation or 5-point interpolation. See DoInterpolation().
static constexpr float kInterpolate2Point = 0.3;
static constexpr float kInterpolate3Point = 0.16;
static scoped_refptr<OscillatorHandler> Create(AudioNode&,
float sample_rate,
const String& oscillator_type,
PeriodicWave* wave_table,
AudioParamHandler& frequency,
AudioParamHandler& detune);
~OscillatorHandler() override;
// AudioHandler
void Process(uint32_t frames_to_process) override;
String GetType() const;
void SetType(const String&, ExceptionState&);
void SetPeriodicWave(PeriodicWave*);
void HandleStoppableSourceNode() override;
private:
OscillatorHandler(AudioNode&,
float sample_rate,
const String& oscillator_type,
PeriodicWave* wave_table,
AudioParamHandler& frequency,
AudioParamHandler& detune);
bool SetType(uint8_t); // Returns true on success.
// Returns true if there are sample-accurate timeline parameter changes.
bool CalculateSampleAccuratePhaseIncrements(uint32_t frames_to_process);
bool PropagatesSilence() const override;
// Compute the output for k-rate AudioParams
double ProcessKRate(int n, float* dest_p, double virtual_read_index) const;
// Scalar version for the main loop in ProcessKRate(). Returns the updated
// virtual_read_index.
double ProcessKRateScalar(int start_index,
int n,
float* dest_p,
double virtual_read_index,
float frequency,
float rate_scale) const;
// Vectorized version (if available) for the main loop in ProcessKRate().
// Returns the number of elements processed and the updated
// virtual_read_index.
std::tuple<int, double> ProcessKRateVector(int n,
float* dest_p,
double virtual_read_index,
float frequency,
float rate_scale) const;
// Compute the output for a-rate AudioParams
double ProcessARate(int n,
float* dest_p,
double virtual_read_index,
float* phase_increments) const;
// Scalar version of ProcessARate(). Also handles any values not handled by
// the vector version.
//
// k
// start index for where to write the result (and read phase_increments)
// n
// total number of frames to process
// destination
// Array where the samples values are written
// virtual_read_index
// index into the wave data tables containing the waveform
// phase_increments
// phase change to use for each frame of output
//
// Returns the updated virtual_read_index.
double ProcessARateScalar(int k,
int n,
float* destination,
double virtual_read_index,
const float* phase_increments) const;
// Vector version of ProcessARate(). Returns the number of frames processed
// and the update virtual_read_index.
std::tuple<int, double> ProcessARateVector(
int n,
float* destination,
double virtual_read_index,
const float* phase_increments) const;
// Handles the linear interpolation in ProcessARateVector().
//
// destination
// Where the interpolated values are written.
// virtual_read_index
// index into the wave table data
// phase_increments
// phase increments array
// periodic_wave_size
// Length of the periodic wave stored in the wave tables
// lower_wave_data
// Array of the 4 lower wave table arrays
// higher_wave_data
// Array of the 4 higher wave table arrays
// table_interpolation_factor
// Array of linear interpolation factors to use between the lower and
// higher wave tables.
//
// Returns the updated virtual_read_index
double ProcessARateVectorKernel(
float* destination,
double virtual_read_index,
const float* phase_increments,
unsigned periodic_wave_size,
const float* const lower_wave_data[4],
const float* const higher_wave_data[4],
const float table_interpolation_factor[4]) const;
// One of the waveform types defined in the enum.
uint8_t type_;
// Frequency value in Hertz.
scoped_refptr<AudioParamHandler> frequency_;
// Detune value (deviating from the frequency) in Cents.
scoped_refptr<AudioParamHandler> detune_;
bool first_render_;
// m_virtualReadIndex is a sample-frame index into our buffer representing the
// current playback position. Since it's floating-point, it has sub-sample
// accuracy.
double virtual_read_index_;
// Stores sample-accurate values calculated according to frequency and detune.
AudioFloatArray phase_increments_;
AudioFloatArray detune_values_;
// PeriodicWave is held alive by OscillatorNode.
CrossThreadWeakPersistent<PeriodicWave> periodic_wave_;
};
class OscillatorNode final : public AudioScheduledSourceNode {
DEFINE_WRAPPERTYPEINFO();
public:
static OscillatorNode* Create(BaseAudioContext&,
const String& oscillator_type,
PeriodicWave* wave_table,
ExceptionState&);
static OscillatorNode* Create(BaseAudioContext*,
const OscillatorOptions*,
ExceptionState&);
OscillatorNode(BaseAudioContext&,
const String& oscillator_type,
PeriodicWave* wave_table);
void Trace(Visitor*) const override;
String type() const;
void setType(const String&, ExceptionState&);
AudioParam* frequency();
AudioParam* detune();
void setPeriodicWave(PeriodicWave*);
OscillatorHandler& GetOscillatorHandler() const;
// InspectorHelperMixin
void ReportDidCreate() final;
void ReportWillBeDestroyed() final;
private:
Member<AudioParam> frequency_;
Member<AudioParam> detune_;
// This PeriodicWave is held alive here to allow referencing it from
// OscillatorHandler via weak reference.
Member<PeriodicWave> periodic_wave_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_OSCILLATOR_NODE_H_
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