137 lines
4.6 KiB
C++
137 lines
4.6 KiB
C++
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _EFFECT_HAPTIC_GENERATOR_PROCESSORS_H_
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#define _EFFECT_HAPTIC_GENERATOR_PROCESSORS_H_
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#include <sys/types.h>
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#include <memory>
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#include <vector>
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#include <audio_utils/BiquadFilter.h>
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using HapticBiquadFilter = android::audio_utils::BiquadFilter<float>;
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using BiquadFilterCoefficients = std::array<float, android::audio_utils::kBiquadNumCoefs>;
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namespace android::audio_effect::haptic_generator {
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// A class providing a process function that makes input data non-negative.
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class Ramp {
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public:
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explicit Ramp(size_t channelCount);
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void process(float *out, const float *in, size_t frameCount);
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private:
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const size_t mChannelCount;
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};
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class SlowEnvelope {
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public:
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SlowEnvelope(float cornerFrequency, float sampleRate,
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float normalizationPower, float envOffset,
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size_t channelCount);
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void process(float *out, const float *in, size_t frameCount);
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void setNormalizationPower(float normalizationPower);
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void clear();
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private:
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const std::shared_ptr<HapticBiquadFilter> mLpf;
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std::vector<float> mLpfInBuffer;
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std::vector<float> mLpfOutBuffer;
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float mNormalizationPower;
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const float mEnvOffset;
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const float mChannelCount;
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};
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// A class providing a process function that compressively distorts a waveforms
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class Distortion {
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public:
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Distortion(float cornerFrequency, float sampleRate,
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float inputGain, float cubeThreshold,
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float outputGain, size_t channelCount);
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void process(float *out, const float *in, size_t frameCount);
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void setCornerFrequency(float cornerFrequency);
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void setInputGain(float inputGain);
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void setCubeThrehold(float cubeThreshold);
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void setOutputGain(float outputGain);
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void clear();
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private:
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const std::shared_ptr<HapticBiquadFilter> mLpf;
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std::vector<float> mLpfInBuffer;
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float mSampleRate;
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float mCornerFrequency;
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float mInputGain;
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float mCubeThreshold;
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float mOutputGain;
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const size_t mChannelCount;
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};
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// Helper functions
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BiquadFilterCoefficients cascadeFirstOrderFilters(const BiquadFilterCoefficients &coefs1,
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const BiquadFilterCoefficients &coefs2);
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BiquadFilterCoefficients lpfCoefs(const float cornerFrequency, const float sampleRate);
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BiquadFilterCoefficients bpfCoefs(const float ringingFrequency,
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const float q,
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const float sampleRate);
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BiquadFilterCoefficients bsfCoefs(const float ringingFrequency,
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const float zq,
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const float pq,
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const float sampleRate);
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std::shared_ptr<HapticBiquadFilter> createLPF(const float cornerFrequency,
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const float sampleRate,
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const size_t channelCount);
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// Create two cascaded LPF with same corner frequency.
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std::shared_ptr<HapticBiquadFilter> createLPF2(const float cornerFrequency,
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const float sampleRate,
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const size_t channelCount);
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// Create two cascaded HPF with same corner frequency.
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std::shared_ptr<HapticBiquadFilter> createHPF2(const float cornerFrequency,
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const float sampleRate,
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const size_t channelCount);
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std::shared_ptr<HapticBiquadFilter> createBPF(const float ringingFrequency,
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const float q,
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const float sampleRate,
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const size_t channelCount);
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std::shared_ptr<HapticBiquadFilter> createBSF(const float ringingFrequency,
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const float zq,
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const float pq,
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const float sampleRate,
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const size_t channelCount);
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} // namespace android::audio_effect::haptic_generator
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#endif // _EFFECT_HAPTIC_GENERATOR_PROCESSORS_H_
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