| /* |
| * Copyright (C) 2010, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_DSP_KERNEL_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_DSP_KERNEL_H_ |
| |
| #include "third_party/blink/renderer/modules/webaudio/biquad_processor.h" |
| #include "third_party/blink/renderer/platform/audio/audio_dsp_kernel.h" |
| #include "third_party/blink/renderer/platform/audio/biquad.h" |
| |
| namespace blink { |
| |
| class BiquadProcessor; |
| |
| // BiquadDSPKernel is an AudioDSPKernel and is responsible for filtering one |
| // channel of a BiquadProcessor using a Biquad object. |
| |
| class BiquadDSPKernel final : public AudioDSPKernel { |
| public: |
| explicit BiquadDSPKernel(BiquadProcessor* processor) |
| : AudioDSPKernel(processor), |
| tail_time_(std::numeric_limits<double>::infinity()) {} |
| |
| // AudioDSPKernel |
| void Process(const float* source, |
| float* dest, |
| uint32_t frames_to_process) override; |
| void Reset() override { biquad_.Reset(); } |
| |
| // 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 n_frequencies, |
| const float* frequency_hz, |
| float* mag_response, |
| float* phase_response); |
| |
| bool RequiresTailProcessing() const final; |
| double TailTime() const override; |
| double LatencyTime() const override; |
| |
| protected: |
| Biquad biquad_; |
| BiquadProcessor* GetBiquadProcessor() { |
| return static_cast<BiquadProcessor*>(Processor()); |
| } |
| |
| // To prevent audio glitches when parameters are changed, |
| // dezippering is used to slowly change the parameters. |
| void UpdateCoefficientsIfNecessary(int); |
| // Update the biquad cofficients with the given parameters |
| void UpdateCoefficients(int, |
| const float* frequency, |
| const float* q, |
| const float* gain, |
| const float* detune); |
| |
| private: |
| // Compute the tail time using the BiquadFilter coefficients at |
| // index |coef_index|. |
| void UpdateTailTime(int coef_index); |
| |
| // Synchronize process() with getting and setting the filter coefficients. |
| mutable Mutex process_lock_; |
| |
| // The current tail time for biquad filter. |
| double tail_time_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_DSP_KERNEL_H_ |