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| 1 /* | 1 /* |
| 2 * Copyright (C) 2010, Google Inc. All rights reserved. | 2 * Copyright (C) 2010, Google Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
| 6 * are met: | 6 * are met: |
| 7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
| 8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
| 10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
| (...skipping 18 matching lines...) Expand all Loading... |
| 29 #include "platform/audio/AudioDSPKernelProcessor.h" | 29 #include "platform/audio/AudioDSPKernelProcessor.h" |
| 30 #include "platform/audio/Biquad.h" | 30 #include "platform/audio/Biquad.h" |
| 31 #include "modules/webaudio/AudioNode.h" | 31 #include "modules/webaudio/AudioNode.h" |
| 32 #include "modules/webaudio/AudioParam.h" | 32 #include "modules/webaudio/AudioParam.h" |
| 33 #include "wtf/RefPtr.h" | 33 #include "wtf/RefPtr.h" |
| 34 | 34 |
| 35 namespace blink { | 35 namespace blink { |
| 36 | 36 |
| 37 // BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to im
plement several common filters. | 37 // BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to im
plement several common filters. |
| 38 | 38 |
| 39 class BiquadProcessor FINAL : public AudioDSPKernelProcessor { | 39 class BiquadProcessor final : public AudioDSPKernelProcessor { |
| 40 public: | 40 public: |
| 41 enum FilterType { | 41 enum FilterType { |
| 42 LowPass = 0, | 42 LowPass = 0, |
| 43 HighPass = 1, | 43 HighPass = 1, |
| 44 BandPass = 2, | 44 BandPass = 2, |
| 45 LowShelf = 3, | 45 LowShelf = 3, |
| 46 HighShelf = 4, | 46 HighShelf = 4, |
| 47 Peaking = 5, | 47 Peaking = 5, |
| 48 Notch = 6, | 48 Notch = 6, |
| 49 Allpass = 7 | 49 Allpass = 7 |
| 50 }; | 50 }; |
| 51 | 51 |
| 52 BiquadProcessor(AudioContext*, float sampleRate, size_t numberOfChannels, bo
ol autoInitialize); | 52 BiquadProcessor(AudioContext*, float sampleRate, size_t numberOfChannels, bo
ol autoInitialize); |
| 53 virtual ~BiquadProcessor(); | 53 virtual ~BiquadProcessor(); |
| 54 virtual void trace(Visitor*) OVERRIDE; | 54 virtual void trace(Visitor*) override; |
| 55 | 55 |
| 56 virtual PassOwnPtr<AudioDSPKernel> createKernel() OVERRIDE; | 56 virtual PassOwnPtr<AudioDSPKernel> createKernel() override; |
| 57 | 57 |
| 58 virtual void process(const AudioBus* source, AudioBus* destination, size_t f
ramesToProcess) OVERRIDE; | 58 virtual void process(const AudioBus* source, AudioBus* destination, size_t f
ramesToProcess) override; |
| 59 | 59 |
| 60 // Get the magnitude and phase response of the filter at the given | 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. | 61 // set of frequencies (in Hz). The phase response is in radians. |
| 62 void getFrequencyResponse(int nFrequencies, | 62 void getFrequencyResponse(int nFrequencies, |
| 63 const float* frequencyHz, | 63 const float* frequencyHz, |
| 64 float* magResponse, | 64 float* magResponse, |
| 65 float* phaseResponse); | 65 float* phaseResponse); |
| 66 | 66 |
| 67 void checkForDirtyCoefficients(); | 67 void checkForDirtyCoefficients(); |
| 68 | 68 |
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| 88 // so DSP kernels know when to re-compute coefficients | 88 // so DSP kernels know when to re-compute coefficients |
| 89 bool m_filterCoefficientsDirty; | 89 bool m_filterCoefficientsDirty; |
| 90 | 90 |
| 91 // Set to true if any of the filter parameters are sample-accurate. | 91 // Set to true if any of the filter parameters are sample-accurate. |
| 92 bool m_hasSampleAccurateValues; | 92 bool m_hasSampleAccurateValues; |
| 93 }; | 93 }; |
| 94 | 94 |
| 95 } // namespace blink | 95 } // namespace blink |
| 96 | 96 |
| 97 #endif // BiquadProcessor_h | 97 #endif // BiquadProcessor_h |
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