Merge "Haptic Generator : Add libeffect implementation" am: e1f6e9ce9e (e7326c0b) · Commits · e / os / android_frameworks_av

media/libeffects/hapticgenerator/Android.bp

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		@@ -57,3 +57,32 @@ cc_library_shared {
		"libaudioeffects",
		],
		}

		cc_library_shared {
		name: "libhapticgeneratoraidl",
		srcs: [
		"aidl/EffectHapticGenerator.cpp",
		"aidl/HapticGeneratorContext.cpp",
		"Processors.cpp",
		":effectCommonFile",
		],
		defaults: [
		"aidlaudioservice_defaults",
		"latest_android_hardware_audio_effect_ndk_shared",
		"latest_android_media_audio_common_types_ndk_shared",
		],
		header_libs: [
		"libaudioeffects",
		"libhardware_headers"
		],
		shared_libs: [
		"libbase",
		"libaudioutils",
		"libcutils",
		"liblog",
		"libvibratorutils",
		],
		visibility: [
		"//hardware/interfaces/audio/aidl/default",
		],
		}

media/libeffects/hapticgenerator/aidl/EffectHapticGenerator.cpp

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		/*
		* Copyright (C) 2022 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#define LOG_TAG "AHAL_HapticGeneratorImpl"

		#include "EffectHapticGenerator.h"

		#include <android-base/logging.h>
		#include <audio_effects/effect_hapticgenerator.h>

		using aidl::android::hardware::audio::effect::Descriptor;
		using aidl::android::hardware::audio::effect::HapticGeneratorImpl;
		using aidl::android::hardware::audio::effect::IEffect;
		using aidl::android::hardware::audio::effect::kHapticGeneratorImplUUID;
		using aidl::android::media::audio::common::AudioUuid;

		extern "C" binder_exception_t createEffect(const AudioUuid* in_impl_uuid,
		std::shared_ptr<IEffect>* instanceSpp) {
		if (!in_impl_uuid \|\| *in_impl_uuid != kHapticGeneratorImplUUID) {
		LOG(ERROR) << __func__ << "uuid not supported";
		return EX_ILLEGAL_ARGUMENT;
		}
		if (instanceSpp) {
		*instanceSpp = ndk::SharedRefBase::make<HapticGeneratorImpl>();
		LOG(DEBUG) << __func__ << " instance " << instanceSpp->get() << " created";
		return EX_NONE;
		} else {
		LOG(ERROR) << __func__ << " invalid input parameter!";
		return EX_ILLEGAL_ARGUMENT;
		}
		}

		extern "C" binder_exception_t queryEffect(const AudioUuid* in_impl_uuid, Descriptor* _aidl_return) {
		if (!in_impl_uuid \|\| *in_impl_uuid != kHapticGeneratorImplUUID) {
		LOG(ERROR) << __func__ << "uuid not supported";
		return EX_ILLEGAL_ARGUMENT;
		}
		*_aidl_return = HapticGeneratorImpl::kDescriptor;
		return EX_NONE;
		}

		namespace aidl::android::hardware::audio::effect {

		const std::string HapticGeneratorImpl::kEffectName = "Haptic Generator";
		const Descriptor HapticGeneratorImpl::kDescriptor = {
		.common = {.id = {.type = kHapticGeneratorTypeUUID,
		.uuid = kHapticGeneratorImplUUID,
		.proxy = std::nullopt},
		.flags = {.type = Flags::Type::INSERT, .insert = Flags::Insert::FIRST},
		.name = HapticGeneratorImpl::kEffectName,
		.implementor = "The Android Open Source Project"}};

		ndk::ScopedAStatus HapticGeneratorImpl::getDescriptor(Descriptor* _aidl_return) {
		RETURN_IF(!_aidl_return, EX_ILLEGAL_ARGUMENT, "Parameter:nullptr");
		LOG(DEBUG) << __func__ << kDescriptor.toString();
		*_aidl_return = kDescriptor;
		return ndk::ScopedAStatus::ok();
		}

		ndk::ScopedAStatus HapticGeneratorImpl::commandImpl(CommandId command) {
		RETURN_IF(!mContext, EX_NULL_POINTER, "nullContext");
		switch (command) {
		case CommandId::START:
		mContext->enable();
		break;
		case CommandId::STOP:
		mContext->disable();
		break;
		case CommandId::RESET:
		mContext->reset();
		break;
		default:
		LOG(ERROR) << __func__ << " commandId " << toString(command) << " not supported";
		return ndk::ScopedAStatus::fromExceptionCodeWithMessage(EX_ILLEGAL_ARGUMENT,
		"commandIdNotSupported");
		}
		return ndk::ScopedAStatus::ok();
		}

		ndk::ScopedAStatus HapticGeneratorImpl::setParameterSpecific(const Parameter::Specific& specific) {
		RETURN_IF(Parameter::Specific::hapticGenerator != specific.getTag(), EX_ILLEGAL_ARGUMENT,
		"EffectNotSupported");
		RETURN_IF(!mContext, EX_NULL_POINTER, "nullContext");

		auto& hgParam = specific.get<Parameter::Specific::hapticGenerator>();
		auto tag = hgParam.getTag();

		switch (tag) {
		case HapticGenerator::hapticScale: {
		RETURN_IF(mContext->setHgHapticScale(hgParam.get<HapticGenerator::hapticScale>()) !=
		RetCode::SUCCESS,
		EX_ILLEGAL_ARGUMENT, "setHapticScaleFailed");
		return ndk::ScopedAStatus::ok();
		}
		case HapticGenerator::vibratorInfo: {
		RETURN_IF(mContext->setHgVibratorInformation(
		hgParam.get<HapticGenerator::vibratorInfo>()) != RetCode::SUCCESS,
		EX_ILLEGAL_ARGUMENT, "setVibratorInfoFailed");
		return ndk::ScopedAStatus::ok();
		}
		default: {
		LOG(ERROR) << __func__ << " unsupported tag: " << toString(tag);
		return ndk::ScopedAStatus::fromExceptionCodeWithMessage(
		EX_ILLEGAL_ARGUMENT, "HapticGeneratorTagNotSupported");
		}
		}
		}

		ndk::ScopedAStatus HapticGeneratorImpl::getParameterSpecific(const Parameter::Id& id,
		Parameter::Specific* specific) {
		RETURN_IF(!specific, EX_NULL_POINTER, "nullPtr");
		auto tag = id.getTag();
		RETURN_IF(Parameter::Id::hapticGeneratorTag != tag, EX_ILLEGAL_ARGUMENT, "wrongIdTag");
		auto hgId = id.get<Parameter::Id::hapticGeneratorTag>();
		auto hgIdTag = hgId.getTag();
		switch (hgIdTag) {
		case HapticGenerator::Id::commonTag:
		return getParameterHapticGenerator(hgId.get<HapticGenerator::Id::commonTag>(),
		specific);
		default:
		LOG(ERROR) << __func__ << " unsupported tag: " << toString(hgIdTag);
		return ndk::ScopedAStatus::fromExceptionCodeWithMessage(
		EX_ILLEGAL_ARGUMENT, "HapticGeneratorTagNotSupported");
		}
		}

		ndk::ScopedAStatus HapticGeneratorImpl::getParameterHapticGenerator(const HapticGenerator::Tag& tag,
		Parameter::Specific* specific) {
		RETURN_IF(!mContext, EX_NULL_POINTER, "nullContext");

		HapticGenerator hgParam;
		switch (tag) {
		case HapticGenerator::hapticScale: {
		hgParam.set<HapticGenerator::hapticScale>(mContext->getHgHapticScale());
		break;
		}
		case HapticGenerator::vibratorInfo: {
		hgParam.set<HapticGenerator::vibratorInfo>(mContext->getHgVibratorInformation());
		break;
		}
		default: {
		LOG(ERROR) << __func__ << " unsupported tag: " << toString(tag);
		return ndk::ScopedAStatus::fromExceptionCodeWithMessage(
		EX_ILLEGAL_ARGUMENT, "HapticGeneratorTagNotSupported");
		}
		}

		specific->set<Parameter::Specific::hapticGenerator>(hgParam);
		return ndk::ScopedAStatus::ok();
		}

		std::shared_ptr<EffectContext> HapticGeneratorImpl::createContext(const Parameter::Common& common) {
		if (mContext) {
		LOG(DEBUG) << __func__ << " context already exist";
		return mContext;
		}

		mContext = std::make_shared<HapticGeneratorContext>(1 /* statusFmqDepth */, common);
		return mContext;
		}

		RetCode HapticGeneratorImpl::releaseContext() {
		if (mContext) {
		mContext->reset();
		}
		return RetCode::SUCCESS;
		}

		// Processing method running in EffectWorker thread.
		IEffect::Status HapticGeneratorImpl::effectProcessImpl(float* in, float* out, int samples) {
		IEffect::Status status = {EX_NULL_POINTER, 0, 0};
		RETURN_VALUE_IF(!mContext, status, "nullContext");
		return mContext->lvmProcess(in, out, samples);
		}

		} // namespace aidl::android::hardware::audio::effect

media/libeffects/hapticgenerator/aidl/EffectHapticGenerator.h

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		/*
		* Copyright (C) 2022 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#pragma once

		#include <aidl/android/hardware/audio/effect/BnEffect.h>

		#include "HapticGeneratorContext.h"
		#include "effect-impl/EffectImpl.h"
		#include "effect-impl/EffectUUID.h"

		namespace aidl::android::hardware::audio::effect {

		class HapticGeneratorImpl final : public EffectImpl {
		public:
		static const std::string kEffectName;
		static const Descriptor kDescriptor;
		HapticGeneratorImpl() { LOG(DEBUG) << __func__; }
		~HapticGeneratorImpl() {
		cleanUp();
		LOG(DEBUG) << __func__;
		}

		ndk::ScopedAStatus commandImpl(CommandId command) override;
		ndk::ScopedAStatus getDescriptor(Descriptor* _aidl_return) override;
		ndk::ScopedAStatus setParameterSpecific(const Parameter::Specific& specific) override;
		ndk::ScopedAStatus getParameterSpecific(const Parameter::Id& id,
		Parameter::Specific* specific) override;
		IEffect::Status effectProcessImpl(float* in, float* out, int process) override;
		std::shared_ptr<EffectContext> createContext(const Parameter::Common& common) override;
		RetCode releaseContext() override;

		std::shared_ptr<EffectContext> getContext() override { return mContext; }
		std::string getEffectName() override { return kEffectName; }

		private:
		std::shared_ptr<HapticGeneratorContext> mContext;
		ndk::ScopedAStatus getParameterHapticGenerator(const HapticGenerator::Tag& tag,
		Parameter::Specific* specific);
		};

		} // namespace aidl::android::hardware::audio::effect

media/libeffects/hapticgenerator/aidl/HapticGeneratorContext.cpp

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		/*
		* Copyright (C) 2022 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#define LOG_TAG "AHAL_HapticGeneratorContext"

		#include <Utils.h>
		#include <android-base/parsedouble.h>
		#include <android-base/properties.h>

		#include "HapticGeneratorContext.h"

		namespace aidl::android::hardware::audio::effect {

		HapticGeneratorContext::HapticGeneratorContext(int statusDepth, const Parameter::Common& common)
		: EffectContext(statusDepth, common) {
		LOG(DEBUG) << __func__;
		mState = HAPTIC_GENERATOR_STATE_UNINITIALIZED;
		mSampleRate = common.input.base.sampleRate;
		mFrameCount = common.input.frameCount;
		init_params(common.input.base.channelMask, common.output.base.channelMask);
		}

		HapticGeneratorContext::~HapticGeneratorContext() {
		LOG(DEBUG) << __func__;
		mState = HAPTIC_GENERATOR_STATE_UNINITIALIZED;
		}

		RetCode HapticGeneratorContext::enable() {
		if (mState != HAPTIC_GENERATOR_STATE_INITIALIZED) {
		return RetCode::ERROR_EFFECT_LIB_ERROR;
		}
		mState = HAPTIC_GENERATOR_STATE_ACTIVE;
		return RetCode::SUCCESS;
		}

		RetCode HapticGeneratorContext::disable() {
		if (mState != HAPTIC_GENERATOR_STATE_ACTIVE) {
		return RetCode::ERROR_EFFECT_LIB_ERROR;
		}
		mState = HAPTIC_GENERATOR_STATE_INITIALIZED;
		return RetCode::SUCCESS;
		}

		void HapticGeneratorContext::reset() {
		for (auto& filter : mProcessorsRecord.filters) {
		filter->clear();
		}
		for (auto& slowEnv : mProcessorsRecord.slowEnvs) {
		slowEnv->clear();
		}
		for (auto& distortion : mProcessorsRecord.distortions) {
		distortion->clear();
		}
		}

		RetCode HapticGeneratorContext::setHgHapticScale(const HapticGenerator::HapticScale& hapticScale) {
		mParams.mHapticScale = hapticScale;
		if (hapticScale.scale == HapticGenerator::VibratorScale::MUTE) {
		mParams.mHapticScales.erase(hapticScale.id);
		} else {
		mParams.mHapticScales.emplace(hapticScale.id, hapticScale.scale);
		}
		mParams.mMaxVibratorScale = hapticScale.scale;
		for (const auto& [id, vibratorScale] : mParams.mHapticScales) {
		mParams.mMaxVibratorScale = std::max(mParams.mMaxVibratorScale, vibratorScale);
		}
		return RetCode::SUCCESS;
		}

		RetCode HapticGeneratorContext::setHgVibratorInformation(
		const HapticGenerator::VibratorInformation& vibratorInfo) {
		mParams.mVibratorInfo = vibratorInfo;

		if (mProcessorsRecord.bpf != nullptr) {
		mProcessorsRecord.bpf->setCoefficients(::android::audio_effect::haptic_generator::bpfCoefs(
		mParams.mVibratorInfo.resonantFrequencyHz, DEFAULT_BPF_Q, mSampleRate));
		}
		if (mProcessorsRecord.bsf != nullptr) {
		mProcessorsRecord.bsf->setCoefficients(::android::audio_effect::haptic_generator::bsfCoefs(
		mParams.mVibratorInfo.resonantFrequencyHz, mParams.mVibratorInfo.qFactor,
		mParams.mVibratorInfo.qFactor / 2.0f, mSampleRate));
		}
		configure();
		return RetCode::SUCCESS;
		}

		IEffect::Status HapticGeneratorContext::lvmProcess(float* in, float* out, int samples) {
		LOG(DEBUG) << __func__ << " in " << in << " out " << out << " sample " << samples;

		IEffect::Status status = {EX_NULL_POINTER, 0, 0};
		RETURN_VALUE_IF(!in, status, "nullInput");
		RETURN_VALUE_IF(!out, status, "nullOutput");
		status = {EX_ILLEGAL_STATE, 0, 0};
		RETURN_VALUE_IF(getInputFrameSize() != getOutputFrameSize(), status, "FrameSizeMismatch");
		auto frameSize = getInputFrameSize();
		RETURN_VALUE_IF(0 == frameSize, status, "zeroFrameSize");

		LOG(DEBUG) << __func__ << " start processing";
		// The audio data must not be modified but just written to
		// output buffer according the access mode.
		bool accumulate = false;
		if (in != out) {
		for (int i = 0; i < samples; i++) {
		if (accumulate) {
		out[i] += in[i];
		} else {
		out[i] = in[i];
		}
		}
		}

		if (mState != HAPTIC_GENERATOR_STATE_ACTIVE) {
		return status;
		}

		if (mParams.mMaxVibratorScale == HapticGenerator::VibratorScale::MUTE) {
		// Haptic channels are muted, not need to generate haptic data.
		return {STATUS_OK, samples, samples};
		}

		// Resize buffer if the haptic sample count is greater than buffer size.
		size_t hapticSampleCount = mFrameCount * mParams.mHapticChannelCount;
		if (hapticSampleCount > mInputBuffer.size()) {
		// The inputBuffer and outputBuffer must have the same size, which must be at least
		// the haptic sample count.
		mInputBuffer.resize(hapticSampleCount);
		mOutputBuffer.resize(hapticSampleCount);
		}

		// Construct input buffer according to haptic channel source
		for (size_t i = 0; i < mFrameCount; ++i) {
		for (size_t j = 0; j < mParams.mHapticChannelCount; ++j) {
		mInputBuffer[i * mParams.mHapticChannelCount + j] =
		in[i * mParams.mAudioChannelCount + mParams.mHapticChannelSource[j]];
		}
		}

		float* hapticOutBuffer =
		runProcessingChain(mInputBuffer.data(), mOutputBuffer.data(), mFrameCount);
		::android::os::scaleHapticData(
		hapticOutBuffer, hapticSampleCount,
		static_cast<::android::os::HapticScale>(mParams.mMaxVibratorScale),
		mParams.mVibratorInfo.qFactor);

		// For haptic data, the haptic playback thread will copy the data from effect input
		// buffer, which contains haptic data at the end of the buffer, directly to sink buffer.
		// In that case, copy haptic data to input buffer instead of output buffer.
		// Note: this may not work with rpc/binder calls
		int offset = samples;
		for (int i = 0; i < hapticSampleCount; ++i) {
		in[samples + i] = hapticOutBuffer[i];
		}
		return {STATUS_OK, samples, static_cast<int32_t>(samples + hapticSampleCount)};
		}

		void HapticGeneratorContext::init_params(media::audio::common::AudioChannelLayout inputChMask,
		media::audio::common::AudioChannelLayout outputChMask) {
		mParams.mMaxVibratorScale = HapticGenerator::VibratorScale::MUTE;
		mParams.mVibratorInfo.resonantFrequencyHz = DEFAULT_RESONANT_FREQUENCY;
		mParams.mVibratorInfo.qFactor = DEFAULT_BSF_ZERO_Q;

		mParams.mAudioChannelCount = ::android::hardware::audio::common::getChannelCount(
		inputChMask, ~media::audio::common::AudioChannelLayout::LAYOUT_HAPTIC_AB);
		mParams.mHapticChannelCount = ::android::hardware::audio::common::getChannelCount(
		outputChMask, media::audio::common::AudioChannelLayout::LAYOUT_HAPTIC_AB);
		LOG_ALWAYS_FATAL_IF(mParams.mHapticChannelCount > 2, "haptic channel count is too large");
		for (size_t i = 0; i < mParams.mHapticChannelCount; ++i) {
		// By default, use the first audio channel to generate haptic channels.
		mParams.mHapticChannelSource[i] = 0;
		}

		mState = HAPTIC_GENERATOR_STATE_INITIALIZED;
		}

		float HapticGeneratorContext::getDistortionOutputGain() {
		float distortionOutputGain = getFloatProperty(
		"vendor.audio.hapticgenerator.distortion.output.gain", DEFAULT_DISTORTION_OUTPUT_GAIN);
		LOG(DEBUG) << "Using distortion output gain as " << distortionOutputGain;
		return distortionOutputGain;
		}

		float HapticGeneratorContext::getFloatProperty(const std::string& key, float defaultValue) {
		float result;
		std::string value = ::android::base::GetProperty(key, "");
		if (!value.empty() && ::android::base::ParseFloat(value, &result)) {
		return result;
		}
		return defaultValue;
		}

		void HapticGeneratorContext::addBiquadFilter(std::shared_ptr<HapticBiquadFilter> filter) {
		// The process chain captures the shared pointer of the filter in lambda.
		// The process record will keep a shared pointer to the filter so that it is possible to
		// access the filter outside of the process chain.
		mProcessorsRecord.filters.push_back(filter);
		mProcessingChain.push_back([filter](float* out, const float* in, size_t frameCount) {
		filter->process(out, in, frameCount);
		});
		}

		/**
		* Build haptic generator processing chain.
		*/
		void HapticGeneratorContext::buildProcessingChain() {
		const size_t channelCount = mParams.mHapticChannelCount;
		float highPassCornerFrequency = 50.0f;
		auto hpf = ::android::audio_effect::haptic_generator::createHPF2(highPassCornerFrequency,
		mSampleRate, channelCount);
		addBiquadFilter(hpf);
		float lowPassCornerFrequency = 9000.0f;
		auto lpf = ::android::audio_effect::haptic_generator::createLPF2(lowPassCornerFrequency,
		mSampleRate, channelCount);
		addBiquadFilter(lpf);

		auto ramp = std::make_shared<::android::audio_effect::haptic_generator::Ramp>(
		channelCount); // ramp = half-wave rectifier.
		// The process chain captures the shared pointer of the ramp in lambda. It will be the only
		// reference to the ramp.
		// The process record will keep a weak pointer to the ramp so that it is possible to access
		// the ramp outside of the process chain.
		mProcessorsRecord.ramps.push_back(ramp);
		mProcessingChain.push_back([ramp](float* out, const float* in, size_t frameCount) {
		ramp->process(out, in, frameCount);
		});

		highPassCornerFrequency = 60.0f;
		hpf = ::android::audio_effect::haptic_generator::createHPF2(highPassCornerFrequency,
		mSampleRate, channelCount);
		addBiquadFilter(hpf);
		lowPassCornerFrequency = 700.0f;
		lpf = ::android::audio_effect::haptic_generator::createLPF2(lowPassCornerFrequency, mSampleRate,
		channelCount);
		addBiquadFilter(lpf);

		lowPassCornerFrequency = 400.0f;
		lpf = ::android::audio_effect::haptic_generator::createLPF2(lowPassCornerFrequency, mSampleRate,
		channelCount);
		addBiquadFilter(lpf);
		lowPassCornerFrequency = 500.0f;
		lpf = ::android::audio_effect::haptic_generator::createLPF2(lowPassCornerFrequency, mSampleRate,
		channelCount);
		addBiquadFilter(lpf);

		auto bpf = ::android::audio_effect::haptic_generator::createBPF(
		mParams.mVibratorInfo.resonantFrequencyHz, DEFAULT_BPF_Q, mSampleRate, channelCount);
		mProcessorsRecord.bpf = bpf;
		addBiquadFilter(bpf);

		float normalizationPower = DEFAULT_SLOW_ENV_NORMALIZATION_POWER;
		// The process chain captures the shared pointer of the slow envelope in lambda. It will
		// be the only reference to the slow envelope.
		// The process record will keep a weak pointer to the slow envelope so that it is possible
		// to access the slow envelope outside of the process chain.
		// SlowEnvelope = partial normalizer, or AGC.
		auto slowEnv = std::make_shared<::android::audio_effect::haptic_generator::SlowEnvelope>(
		5.0f /envCornerFrequency/, mSampleRate, normalizationPower, 0.01f /envOffset/,
		channelCount);
		mProcessorsRecord.slowEnvs.push_back(slowEnv);
		mProcessingChain.push_back([slowEnv](float* out, const float* in, size_t frameCount) {
		slowEnv->process(out, in, frameCount);
		});

		auto bsf = ::android::audio_effect::haptic_generator::createBSF(
		mParams.mVibratorInfo.resonantFrequencyHz, mParams.mVibratorInfo.qFactor,
		mParams.mVibratorInfo.qFactor / 2.0f, mSampleRate, channelCount);
		mProcessorsRecord.bsf = bsf;
		addBiquadFilter(bsf);

		// The process chain captures the shared pointer of the Distortion in lambda. It will
		// be the only reference to the Distortion.
		// The process record will keep a weak pointer to the Distortion so that it is possible
		// to access the Distortion outside of the process chain.
		auto distortion = std::make_shared<::android::audio_effect::haptic_generator::Distortion>(
		DEFAULT_DISTORTION_CORNER_FREQUENCY, mSampleRate, DEFAULT_DISTORTION_INPUT_GAIN,
		DEFAULT_DISTORTION_CUBE_THRESHOLD, getDistortionOutputGain(), channelCount);
		mProcessorsRecord.distortions.push_back(distortion);
		mProcessingChain.push_back([distortion](float* out, const float* in, size_t frameCount) {
		distortion->process(out, in, frameCount);
		});
		}

		void HapticGeneratorContext::configure() {
		mProcessingChain.clear();
		mProcessorsRecord.filters.clear();
		mProcessorsRecord.ramps.clear();
		mProcessorsRecord.slowEnvs.clear();
		mProcessorsRecord.distortions.clear();

		buildProcessingChain();
		}

		/**
		* Run the processing chain to generate haptic data from audio data
		*
		* @param buf1 a buffer contains raw audio data
		* @param buf2 a buffer that is large enough to keep all the data
		* @param frameCount frame count of the data
		*
		* @return a pointer to the output buffer
		*/
		float* HapticGeneratorContext::runProcessingChain(float* buf1, float* buf2, size_t frameCount) {
		float* in = buf1;
		float* out = buf2;
		for (const auto processingFunc : mProcessingChain) {
		processingFunc(out, in, frameCount);
		std::swap(in, out);
		}
		return in;
		}

		} // namespace aidl::android::hardware::audio::effect

media/libeffects/hapticgenerator/aidl/HapticGeneratorContext.h

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