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25 #ifndef BiquadProcessor_h
26 #define BiquadProcessor_h
28 #include "AudioDSPKernel.h"
29 #include "AudioDSPKernelProcessor.h"
30 #include "AudioNode.h"
31 #include "AudioParam.h"
33 #include <wtf/RefPtr.h>
37 // BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to implement several common filters.
39 class BiquadProcessor : public AudioDSPKernelProcessor {
52 BiquadProcessor(float sampleRate, size_t numberOfChannels, bool autoInitialize);
54 // Old constructor used by deprecated LowPass2FilterNode and HighPass2FilterNode
55 BiquadProcessor(FilterType, float sampleRate, size_t numberOfChannels, bool autoInitialize = true);
57 virtual ~BiquadProcessor();
59 virtual PassOwnPtr<AudioDSPKernel> createKernel();
61 virtual void process(AudioBus* source, AudioBus* destination, size_t framesToProcess);
63 // Get the magnitude and phase response of the filter at the given
64 // set of frequencies (in Hz). The phase response is in radians.
65 void getFrequencyResponse(int nFrequencies,
66 const float* frequencyHz,
68 float* phaseResponse);
70 void checkForDirtyCoefficients();
72 bool filterCoefficientsDirty() const { return m_filterCoefficientsDirty; }
74 AudioParam* parameter1() { return m_parameter1.get(); }
75 AudioParam* parameter2() { return m_parameter2.get(); }
76 AudioParam* parameter3() { return m_parameter3.get(); }
78 FilterType type() const { return m_type; }
79 void setType(FilterType);
84 RefPtr<AudioParam> m_parameter1;
85 RefPtr<AudioParam> m_parameter2;
86 RefPtr<AudioParam> m_parameter3;
88 // so DSP kernels know when to re-compute coefficients
89 bool m_filterCoefficientsDirty;
92 } // namespace WebCore
94 #endif // BiquadProcessor_h