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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 17 matching lines...) Expand all Loading... |
| 28 #include "platform/audio/AudioDSPKernel.h" | 28 #include "platform/audio/AudioDSPKernel.h" |
| 29 #include "platform/audio/Biquad.h" | 29 #include "platform/audio/Biquad.h" |
| 30 #include "modules/webaudio/BiquadProcessor.h" | 30 #include "modules/webaudio/BiquadProcessor.h" |
| 31 | 31 |
| 32 namespace blink { | 32 namespace blink { |
| 33 | 33 |
| 34 class BiquadProcessor; | 34 class BiquadProcessor; |
| 35 | 35 |
| 36 // BiquadDSPKernel is an AudioDSPKernel and is responsible for filtering one cha
nnel of a BiquadProcessor using a Biquad object. | 36 // BiquadDSPKernel is an AudioDSPKernel and is responsible for filtering one cha
nnel of a BiquadProcessor using a Biquad object. |
| 37 | 37 |
| 38 class BiquadDSPKernel FINAL : public AudioDSPKernel { | 38 class BiquadDSPKernel final : public AudioDSPKernel { |
| 39 public: | 39 public: |
| 40 explicit BiquadDSPKernel(BiquadProcessor* processor) | 40 explicit BiquadDSPKernel(BiquadProcessor* processor) |
| 41 : AudioDSPKernel(processor) | 41 : AudioDSPKernel(processor) |
| 42 { | 42 { |
| 43 } | 43 } |
| 44 | 44 |
| 45 // AudioDSPKernel | 45 // AudioDSPKernel |
| 46 virtual void process(const float* source, float* dest, size_t framesToProces
s) OVERRIDE; | 46 virtual void process(const float* source, float* dest, size_t framesToProces
s) override; |
| 47 virtual void reset() OVERRIDE { m_biquad.reset(); } | 47 virtual void reset() override { m_biquad.reset(); } |
| 48 | 48 |
| 49 // Get the magnitude and phase response of the filter at the given | 49 // Get the magnitude and phase response of the filter at the given |
| 50 // set of frequencies (in Hz). The phase response is in radians. | 50 // set of frequencies (in Hz). The phase response is in radians. |
| 51 void getFrequencyResponse(int nFrequencies, | 51 void getFrequencyResponse(int nFrequencies, |
| 52 const float* frequencyHz, | 52 const float* frequencyHz, |
| 53 float* magResponse, | 53 float* magResponse, |
| 54 float* phaseResponse); | 54 float* phaseResponse); |
| 55 | 55 |
| 56 virtual double tailTime() const OVERRIDE; | 56 virtual double tailTime() const override; |
| 57 virtual double latencyTime() const OVERRIDE; | 57 virtual double latencyTime() const override; |
| 58 | 58 |
| 59 protected: | 59 protected: |
| 60 Biquad m_biquad; | 60 Biquad m_biquad; |
| 61 BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(pr
ocessor()); } | 61 BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(pr
ocessor()); } |
| 62 | 62 |
| 63 // To prevent audio glitches when parameters are changed, | 63 // To prevent audio glitches when parameters are changed, |
| 64 // dezippering is used to slowly change the parameters. | 64 // dezippering is used to slowly change the parameters. |
| 65 void updateCoefficientsIfNecessary(); | 65 void updateCoefficientsIfNecessary(); |
| 66 // Update the biquad cofficients with the given parameters | 66 // Update the biquad cofficients with the given parameters |
| 67 void updateCoefficients(double frequency, double Q, double gain, double detu
ne); | 67 void updateCoefficients(double frequency, double Q, double gain, double detu
ne); |
| 68 | 68 |
| 69 private: | 69 private: |
| 70 // Synchronize process() with getting and setting the filter coefficients. | 70 // Synchronize process() with getting and setting the filter coefficients. |
| 71 mutable Mutex m_processLock; | 71 mutable Mutex m_processLock; |
| 72 }; | 72 }; |
| 73 | 73 |
| 74 } // namespace blink | 74 } // namespace blink |
| 75 | 75 |
| 76 #endif // BiquadDSPKernel_h | 76 #endif // BiquadDSPKernel_h |
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