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25 #ifndef BiquadProcessor_h
26 #define BiquadProcessor_h
28 #include "platform/audio/AudioDSPKernel.h"
29 #include "platform/audio/AudioDSPKernelProcessor.h"
30 #include "platform/audio/Biquad.h"
31 #include "modules/webaudio/AudioNode.h"
32 #include "modules/webaudio/AudioParam.h"
33 #include "wtf/RefPtr.h"
37 // BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to implement several common filters.
39 class BiquadProcessor FINAL : public AudioDSPKernelProcessor {
52 BiquadProcessor(AudioContext*, float sampleRate, size_t numberOfChannels, bool autoInitialize);
54 virtual ~BiquadProcessor();
56 virtual PassOwnPtr<AudioDSPKernel> createKernel() OVERRIDE;
58 virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) OVERRIDE;
60 // Get the magnitude and phase response of the filter at the given
61 // set of frequencies (in Hz). The phase response is in radians.
62 void getFrequencyResponse(int nFrequencies,
63 const float* frequencyHz,
65 float* phaseResponse);
67 void checkForDirtyCoefficients();
69 bool filterCoefficientsDirty() const { return m_filterCoefficientsDirty; }
70 bool hasSampleAccurateValues() const { return m_hasSampleAccurateValues; }
72 AudioParam* parameter1() { return m_parameter1.get(); }
73 AudioParam* parameter2() { return m_parameter2.get(); }
74 AudioParam* parameter3() { return m_parameter3.get(); }
75 AudioParam* parameter4() { return m_parameter4.get(); }
77 FilterType type() const { return m_type; }
78 void setType(FilterType);
83 RefPtr<AudioParam> m_parameter1;
84 RefPtr<AudioParam> m_parameter2;
85 RefPtr<AudioParam> m_parameter3;
86 RefPtr<AudioParam> m_parameter4;
88 // so DSP kernels know when to re-compute coefficients
89 bool m_filterCoefficientsDirty;
91 // Set to true if any of the filter parameters are sample-accurate.
92 bool m_hasSampleAccurateValues;
95 } // namespace WebCore
97 #endif // BiquadProcessor_h