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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 OscillatorNode_h
#define OscillatorNode_h
#include "modules/webaudio/AudioParam.h"
#include "modules/webaudio/AudioScheduledSourceNode.h"
#include "platform/audio/AudioBus.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/Threading.h"
namespace blink {
class AbstractAudioContext;
class ExceptionState;
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 {
SINE = 0,
SQUARE = 1,
SAWTOOTH = 2,
TRIANGLE = 3,
CUSTOM = 4
};
static PassRefPtr<OscillatorHandler> create(AudioNode&, float sampleRate, AudioParamHandler& frequency, AudioParamHandler& detune);
~OscillatorHandler() override;
// AudioHandler
void process(size_t framesToProcess) override;
String type() const;
void setType(const String&, ExceptionState&);
void setPeriodicWave(PeriodicWave*);
private:
OscillatorHandler(AudioNode&, float sampleRate, AudioParamHandler& frequency, AudioParamHandler& detune);
bool setType(unsigned); // Returns true on success.
// Returns true if there are sample-accurate timeline parameter changes.
bool calculateSampleAccuratePhaseIncrements(size_t framesToProcess);
bool propagatesSilence() const override;
// One of the waveform types defined in the enum.
unsigned short m_type;
// Frequency value in Hertz.
RefPtr<AudioParamHandler> m_frequency;
// Detune value (deviating from the frequency) in Cents.
RefPtr<AudioParamHandler> m_detune;
bool m_firstRender;
// 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 m_virtualReadIndex;
// Stores sample-accurate values calculated according to frequency and detune.
AudioFloatArray m_phaseIncrements;
AudioFloatArray m_detuneValues;
// This Persistent doesn't make a reference cycle including the owner
// OscillatorNode.
Persistent<PeriodicWave> m_periodicWave;
};
class OscillatorNode final : public AudioScheduledSourceNode {
DEFINE_WRAPPERTYPEINFO();
public:
static OscillatorNode* create(AbstractAudioContext&, float sampleRate);
DECLARE_VIRTUAL_TRACE();
String type() const;
void setType(const String&, ExceptionState&);
AudioParam* frequency();
AudioParam* detune();
void setPeriodicWave(PeriodicWave*);
private:
OscillatorNode(AbstractAudioContext&, float sampleRate);
OscillatorHandler& oscillatorHandler() const;
Member<AudioParam> m_frequency;
Member<AudioParam> m_detune;
};
} // namespace blink
#endif // OscillatorNode_h