/*
* Copyright (C) 2010, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
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*
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#ifndef BiquadProcessor_h
#define BiquadProcessor_h
#include "platform/audio/AudioDSPKernel.h"
#include "platform/audio/AudioDSPKernelProcessor.h"
#include "platform/audio/Biquad.h"
#include "modules/webaudio/AudioNode.h"
#include "modules/webaudio/AudioParam.h"
#include "wtf/RefPtr.h"
namespace WebCore {
// BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to implement several common filters.
class BiquadProcessor FINAL : public AudioDSPKernelProcessor {
public:
enum FilterType {
LowPass = 0,
HighPass = 1,
BandPass = 2,
LowShelf = 3,
HighShelf = 4,
Peaking = 5,
Notch = 6,
Allpass = 7
};
BiquadProcessor(AudioContext*, float sampleRate, size_t numberOfChannels, bool autoInitialize);
virtual ~BiquadProcessor();
virtual PassOwnPtr<AudioDSPKernel> createKernel() OVERRIDE;
virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) OVERRIDE;
// Get the magnitude and phase response of the filter at the given
// set of frequencies (in Hz). The phase response is in radians.
void getFrequencyResponse(int nFrequencies,
const float* frequencyHz,
float* magResponse,
float* phaseResponse);
void checkForDirtyCoefficients();
bool filterCoefficientsDirty() const { return m_filterCoefficientsDirty; }
bool hasSampleAccurateValues() const { return m_hasSampleAccurateValues; }
AudioParam* parameter1() { return m_parameter1.get(); }
AudioParam* parameter2() { return m_parameter2.get(); }
AudioParam* parameter3() { return m_parameter3.get(); }
AudioParam* parameter4() { return m_parameter4.get(); }
FilterType type() const { return m_type; }
void setType(FilterType);
private:
FilterType m_type;
RefPtr<AudioParam> m_parameter1;
RefPtr<AudioParam> m_parameter2;
RefPtr<AudioParam> m_parameter3;
RefPtr<AudioParam> m_parameter4;
// so DSP kernels know when to re-compute coefficients
bool m_filterCoefficientsDirty;
// Set to true if any of the filter parameters are sample-accurate.
bool m_hasSampleAccurateValues;
};
} // namespace WebCore
#endif // BiquadProcessor_h