| /* |
| * 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_PROCESSOR_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_PROCESSOR_H_ |
| |
| #include <memory> |
| #include "base/memory/scoped_refptr.h" |
| #include "third_party/blink/renderer/modules/webaudio/audio_node.h" |
| #include "third_party/blink/renderer/modules/webaudio/audio_param.h" |
| #include "third_party/blink/renderer/platform/audio/audio_dsp_kernel.h" |
| #include "third_party/blink/renderer/platform/audio/audio_dsp_kernel_processor.h" |
| #include "third_party/blink/renderer/platform/audio/biquad.h" |
| |
| namespace blink { |
| |
| // BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to |
| // implement several common filters. |
| |
| class BiquadProcessor final : public AudioDSPKernelProcessor { |
| public: |
| // This values are used in histograms and should not be renumbered or deleted. |
| enum FilterType { |
| kLowPass = 0, |
| kHighPass = 1, |
| kBandPass = 2, |
| kLowShelf = 3, |
| kHighShelf = 4, |
| kPeaking = 5, |
| kNotch = 6, |
| kAllpass = 7 |
| }; |
| |
| BiquadProcessor(float sample_rate, |
| uint32_t number_of_channels, |
| AudioParamHandler& frequency, |
| AudioParamHandler& q, |
| AudioParamHandler& gain, |
| AudioParamHandler& detune); |
| ~BiquadProcessor() override; |
| |
| std::unique_ptr<AudioDSPKernel> CreateKernel() override; |
| |
| void Process(const AudioBus* source, |
| AudioBus* destination, |
| uint32_t frames_to_process) override; |
| |
| void ProcessOnlyAudioParams(uint32_t frames_to_process) override; |
| |
| // 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); |
| |
| void CheckForDirtyCoefficients(); |
| |
| bool FilterCoefficientsDirty() const { return filter_coefficients_dirty_; } |
| bool HasSampleAccurateValues() const { return has_sample_accurate_values_; } |
| |
| AudioParamHandler& Parameter1() { return *parameter1_; } |
| AudioParamHandler& Parameter2() { return *parameter2_; } |
| AudioParamHandler& Parameter3() { return *parameter3_; } |
| AudioParamHandler& Parameter4() { return *parameter4_; } |
| |
| FilterType GetType() const { return type_; } |
| void SetType(FilterType); |
| |
| private: |
| FilterType type_; |
| |
| scoped_refptr<AudioParamHandler> parameter1_; |
| scoped_refptr<AudioParamHandler> parameter2_; |
| scoped_refptr<AudioParamHandler> parameter3_; |
| scoped_refptr<AudioParamHandler> parameter4_; |
| |
| // so DSP kernels know when to re-compute coefficients |
| bool filter_coefficients_dirty_; |
| |
| // Set to true if any of the filter parameters are sample-accurate. |
| bool has_sample_accurate_values_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_BIQUAD_PROCESSOR_H_ |