audio/aidl/default/r_submix/StreamRemoteSubmix.cpp - platform/hardware/interfaces - Git at Google

 /*
  * Copyright (C) 2023 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_StreamRemoteSubmix"
 #include <android-base/logging.h>

 #include <cmath>

 #include "core-impl/StreamRemoteSubmix.h"

 using aidl::android::hardware::audio::common::SinkMetadata;
 using aidl::android::hardware::audio::common::SourceMetadata;
 using aidl::android::media::audio::common::AudioOffloadInfo;
 using aidl::android::media::audio::common::MicrophoneDynamicInfo;
 using aidl::android::media::audio::common::MicrophoneInfo;

 namespace aidl::android::hardware::audio::core {

 StreamRemoteSubmix::StreamRemoteSubmix(const Metadata& metadata, StreamContext&& context)
     : StreamCommonImpl(metadata, std::move(context)),
       mPortId(context.getPortId()),
       mIsInput(isInput(metadata)) {
     mStreamConfig.frameSize = context.getFrameSize();
     mStreamConfig.format = context.getFormat();
     mStreamConfig.channelLayout = context.getChannelLayout();
     mStreamConfig.sampleRate = context.getSampleRate();
 }

 std::mutex StreamRemoteSubmix::sSubmixRoutesLock;
 std::map<int32_t, std::shared_ptr<SubmixRoute>> StreamRemoteSubmix::sSubmixRoutes;

 ::android::status_t StreamRemoteSubmix::init() {
     {
         std::lock_guard guard(sSubmixRoutesLock);
         if (sSubmixRoutes.find(mPortId) != sSubmixRoutes.end()) {
             mCurrentRoute = sSubmixRoutes[mPortId];
         }
     }
     // If route is not available for this port, add it.
     if (mCurrentRoute == nullptr) {
         // Initialize the pipe.
         mCurrentRoute = std::make_shared<SubmixRoute>();
         if (::android::OK != mCurrentRoute->createPipe(mStreamConfig)) {
             LOG(ERROR) << __func__ << ": create pipe failed";
             return mStatus;
         }
         {
             std::lock_guard guard(sSubmixRoutesLock);
             sSubmixRoutes.emplace(mPortId, mCurrentRoute);
         }
     } else {
         if (!mCurrentRoute->isStreamConfigValid(mIsInput, mStreamConfig)) {
             LOG(ERROR) << __func__ << ": invalid stream config";
             return mStatus;
         }
         sp<MonoPipe> sink = mCurrentRoute->getSink();
         if (sink == nullptr) {
             LOG(ERROR) << __func__ << ": nullptr sink when opening stream";
             return mStatus;
         }
         // If the sink has been shutdown or pipe recreation is forced, delete the pipe and
         // recreate it.
         if (sink->isShutdown()) {
             LOG(DEBUG) << __func__ << ": Non-nullptr shut down sink when opening stream";
             if (::android::OK != mCurrentRoute->resetPipe()) {
                 LOG(ERROR) << __func__ << ": reset pipe failed";
                 return mStatus;
             }
         }
     }

     mCurrentRoute->openStream(mIsInput);
     mStatus = ::android::OK;
     return mStatus;
 }

 ::android::status_t StreamRemoteSubmix::drain(StreamDescriptor::DrainMode) {
     usleep(1000);
     return ::android::OK;
 }

 ::android::status_t StreamRemoteSubmix::flush() {
     usleep(1000);
     return ::android::OK;
 }

 ::android::status_t StreamRemoteSubmix::pause() {
     usleep(1000);
     return ::android::OK;
 }

 ndk::ScopedAStatus StreamRemoteSubmix::prepareToClose() {
     if (!mIsInput) {
         std::shared_ptr<SubmixRoute> route = nullptr;
         {
             std::lock_guard guard(sSubmixRoutesLock);
             if (sSubmixRoutes.find(mPortId) != sSubmixRoutes.end()) {
                 route = sSubmixRoutes[mPortId];
             }
         }
         if (route != nullptr) {
             sp<MonoPipe> sink = route->getSink();
             if (sink == nullptr) {
                 ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
             }
             LOG(DEBUG) << __func__ << ": shutting down MonoPipe sink";

             sink->shutdown(true);
         } else {
             LOG(DEBUG) << __func__ << ": stream already closed.";
             ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
         }
     }
     return ndk::ScopedAStatus::ok();
 }

 // Remove references to the specified input and output streams.  When the device no longer
 // references input and output streams destroy the associated pipe.
 void StreamRemoteSubmix::shutdown() {
     mCurrentRoute->closeStream(mIsInput);
     // If all stream instances are closed, we can remove route information for this port.
     if (!mCurrentRoute->hasAtleastOneStreamOpen()) {
         mCurrentRoute->releasePipe();
         LOG(DEBUG) << __func__ << ": pipe destroyed";

         std::lock_guard guard(sSubmixRoutesLock);
         sSubmixRoutes.erase(mPortId);
         mStatus = ::android::NO_INIT;
     }
 }

 ::android::status_t StreamRemoteSubmix::transfer(void* buffer, size_t frameCount,
                                                  size_t* actualFrameCount, int32_t* latencyMs) {
     if (mStatus != ::android::OK) {
         LOG(ERROR) << __func__ << ": failed, not configured";
         return ::android::NO_INIT;
     }

     *latencyMs = (getStreamPipeSizeInFrames() * MILLIS_PER_SECOND) / mStreamConfig.sampleRate;
     LOG(VERBOSE) << __func__ << ": Latency " << *latencyMs << "ms";

     sp<MonoPipe> sink = mCurrentRoute->getSink();
     if (sink != nullptr) {
         if (sink->isShutdown()) {
             sink.clear();
             LOG(VERBOSE) << __func__ << ": pipe shutdown, ignoring the transfer.";
             // the pipe has already been shutdown, this buffer will be lost but we must simulate
             // timing so we don't drain the output faster than realtime
             const size_t delayUs = static_cast<size_t>(
                     std::roundf(frameCount * MICROS_PER_SECOND / mStreamConfig.sampleRate));
             usleep(delayUs);

             *actualFrameCount = frameCount;
             return ::android::OK;
         }
     } else {
         LOG(ERROR) << __func__ << ": transfer without a pipe!";
         return ::android::UNEXPECTED_NULL;
     }

     mCurrentRoute->exitStandby(mIsInput);
     return (mIsInput ? inRead(buffer, frameCount, actualFrameCount)
                      : outWrite(buffer, frameCount, actualFrameCount));
 }

 // Calculate the maximum size of the pipe buffer in frames for the specified stream.
 size_t StreamRemoteSubmix::getStreamPipeSizeInFrames() {
     auto pipeConfig = mCurrentRoute->mPipeConfig;
     const size_t maxFrameSize = std::max(mStreamConfig.frameSize, pipeConfig.frameSize);
     return (pipeConfig.frameCount * pipeConfig.frameSize) / maxFrameSize;
 }

 ::android::status_t StreamRemoteSubmix::outWrite(void* buffer, size_t frameCount,
                                                  size_t* actualFrameCount) {
     sp<MonoPipe> sink = mCurrentRoute->getSink();
     if (sink != nullptr) {
         if (sink->isShutdown()) {
             sink.clear();
             LOG(VERBOSE) << __func__ << ": pipe shutdown, ignoring the write.";
             // the pipe has already been shutdown, this buffer will be lost but we must
             // simulate timing so we don't drain the output faster than realtime
             const size_t delayUs = static_cast<size_t>(
                     std::roundf(frameCount * MICROS_PER_SECOND / mStreamConfig.sampleRate));
             usleep(delayUs);
             *actualFrameCount = frameCount;
             return ::android::OK;
         }
     } else {
         LOG(FATAL) << __func__ << ": without a pipe!";
         return ::android::UNKNOWN_ERROR;
     }

     const size_t availableToWrite = sink->availableToWrite();
     // NOTE: sink has been checked above and sink and source life cycles are synchronized
     sp<MonoPipeReader> source = mCurrentRoute->getSource();
     // If the write to the sink should be blocked, flush enough frames from the pipe to make space
     // to write the most recent data.
     if (!mCurrentRoute->shouldBlockWrite() && availableToWrite < frameCount) {
         static uint8_t flushBuffer[64];
         const size_t flushBufferSizeFrames = sizeof(flushBuffer) / mStreamConfig.frameSize;
         size_t framesToFlushFromSource = frameCount - availableToWrite;
         LOG(VERBOSE) << __func__ << ": flushing " << framesToFlushFromSource
                      << " frames from the pipe to avoid blocking";
         while (framesToFlushFromSource) {
             const size_t flushSize = std::min(framesToFlushFromSource, flushBufferSizeFrames);
             framesToFlushFromSource -= flushSize;
             // read does not block
             source->read(flushBuffer, flushSize);
         }
     }

     ssize_t writtenFrames = sink->write(buffer, frameCount);
     if (writtenFrames < 0) {
         if (writtenFrames == (ssize_t)::android::NEGOTIATE) {
             LOG(ERROR) << __func__ << ": write to pipe returned NEGOTIATE";
             sink.clear();
             *actualFrameCount = 0;
             return ::android::UNKNOWN_ERROR;
         } else {
             // write() returned UNDERRUN or WOULD_BLOCK, retry
             LOG(ERROR) << __func__ << ": write to pipe returned unexpected " << writtenFrames;
             writtenFrames = sink->write(buffer, frameCount);
         }
     }
     sink.clear();

     if (writtenFrames < 0) {
         LOG(ERROR) << __func__ << ": failed writing to pipe with " << writtenFrames;
         *actualFrameCount = 0;
         return ::android::UNKNOWN_ERROR;
     }
     LOG(VERBOSE) << __func__ << ": wrote " << writtenFrames << "frames";
     *actualFrameCount = writtenFrames;
     return ::android::OK;
 }

 ::android::status_t StreamRemoteSubmix::inRead(void* buffer, size_t frameCount,
                                                size_t* actualFrameCount) {
     // about to read from audio source
     sp<MonoPipeReader> source = mCurrentRoute->getSource();
     if (source == nullptr) {
         int readErrorCount = mCurrentRoute->notifyReadError();
         if (readErrorCount < kMaxReadErrorLogs) {
             LOG(ERROR)
                     << __func__
                     << ": no audio pipe yet we're trying to read! (not all errors will be logged)";
         } else {
             LOG(ERROR) << __func__ << ": Read errors " << readErrorCount;
         }
         const size_t delayUs = static_cast<size_t>(
                 std::roundf(frameCount * MICROS_PER_SECOND / mStreamConfig.sampleRate));
         usleep(delayUs);
         memset(buffer, 0, mStreamConfig.frameSize * frameCount);
         *actualFrameCount = frameCount;
         return ::android::OK;
     }

     // read the data from the pipe
     int attempts = 0;
     const size_t delayUs = static_cast<size_t>(std::roundf(kReadAttemptSleepUs));
     char* buff = (char*)buffer;
     size_t remainingFrames = frameCount;

     while ((remainingFrames > 0) && (attempts < kMaxReadFailureAttempts)) {
         LOG(VERBOSE) << __func__ << ": frames available to read " << source->availableToRead();

         ssize_t framesRead = source->read(buff, remainingFrames);

         LOG(VERBOSE) << __func__ << ": frames read " << framesRead;

         if (framesRead > 0) {
             remainingFrames -= framesRead;
             buff += framesRead * mStreamConfig.frameSize;
             LOG(VERBOSE) << __func__ << ": (attempts = " << attempts << ") got " << framesRead
                          << " frames, remaining=" << remainingFrames;
         } else {
             attempts++;
             LOG(WARNING) << __func__ << ": read returned " << framesRead
                          << " , read failure attempts = " << attempts;
             usleep(delayUs);
         }
     }
     // done using the source
     source.clear();

     if (remainingFrames > 0) {
         const size_t remainingBytes = remainingFrames * mStreamConfig.frameSize;
         LOG(VERBOSE) << __func__ << ": clearing remaining_frames = " << remainingFrames;
         memset(((char*)buffer) + (mStreamConfig.frameSize * frameCount) - remainingBytes, 0,
                remainingBytes);
     }

     long readCounterFrames = mCurrentRoute->updateReadCounterFrames(frameCount);
     *actualFrameCount = frameCount;

     // compute how much we need to sleep after reading the data by comparing the wall clock with
     //   the projected time at which we should return.
     // wall clock after reading from the pipe
     auto recordDurationUs = std::chrono::steady_clock::now() - mCurrentRoute->getRecordStartTime();

     // readCounterFrames contains the number of frames that have been read since the beginning of
     // recording (including this call): it's converted to usec and compared to how long we've been
     // recording for, which gives us how long we must wait to sync the projected recording time, and
     // the observed recording time.
     static constexpr float kScaleFactor = .8f;
     const size_t projectedVsObservedOffsetUs =
             kScaleFactor * (static_cast<size_t>(std::roundf((readCounterFrames * MICROS_PER_SECOND /
                                                              mStreamConfig.sampleRate) -
                                                             recordDurationUs.count())));

     LOG(VERBOSE) << __func__ << ": record duration " << recordDurationUs.count()
                  << " microseconds, will wait: " << projectedVsObservedOffsetUs << " microseconds";
     if (projectedVsObservedOffsetUs > 0) {
         usleep(projectedVsObservedOffsetUs);
     }
     return ::android::OK;
 }

 ::android::status_t StreamRemoteSubmix::standby() {
     mCurrentRoute->standby(mIsInput);
     return ::android::OK;
 }

 StreamInRemoteSubmix::StreamInRemoteSubmix(const SinkMetadata& sinkMetadata,
                                            StreamContext&& context,
                                            const std::vector<MicrophoneInfo>& microphones)
     : StreamRemoteSubmix(sinkMetadata, std::move(context)), StreamIn(microphones) {}

 ndk::ScopedAStatus StreamInRemoteSubmix::getActiveMicrophones(
         std::vector<MicrophoneDynamicInfo>* _aidl_return) {
     LOG(DEBUG) << __func__ << ": not supported";
     *_aidl_return = std::vector<MicrophoneDynamicInfo>();
     return ndk::ScopedAStatus::ok();
 }

 StreamOutRemoteSubmix::StreamOutRemoteSubmix(const SourceMetadata& sourceMetadata,
                                              StreamContext&& context,
                                              const std::optional<AudioOffloadInfo>& offloadInfo)
     : StreamRemoteSubmix(sourceMetadata, std::move(context)), StreamOut(offloadInfo) {}

 }  // namespace aidl::android::hardware::audio::core
	/*
	* Copyright (C) 2023 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_StreamRemoteSubmix"
	#include <android-base/logging.h>

	#include <cmath>

	#include "core-impl/StreamRemoteSubmix.h"

	using aidl::android::hardware::audio::common::SinkMetadata;
	using aidl::android::hardware::audio::common::SourceMetadata;
	using aidl::android::media::audio::common::AudioOffloadInfo;
	using aidl::android::media::audio::common::MicrophoneDynamicInfo;
	using aidl::android::media::audio::common::MicrophoneInfo;

	namespace aidl::android::hardware::audio::core {

	StreamRemoteSubmix::StreamRemoteSubmix(const Metadata& metadata, StreamContext&& context)
	: StreamCommonImpl(metadata, std::move(context)),
	mPortId(context.getPortId()),
	mIsInput(isInput(metadata)) {
	mStreamConfig.frameSize = context.getFrameSize();
	mStreamConfig.format = context.getFormat();
	mStreamConfig.channelLayout = context.getChannelLayout();
	mStreamConfig.sampleRate = context.getSampleRate();
	}

	std::mutex StreamRemoteSubmix::sSubmixRoutesLock;
	std::map<int32_t, std::shared_ptr<SubmixRoute>> StreamRemoteSubmix::sSubmixRoutes;

	::android::status_t StreamRemoteSubmix::init() {
	{
	std::lock_guard guard(sSubmixRoutesLock);
	if (sSubmixRoutes.find(mPortId) != sSubmixRoutes.end()) {
	mCurrentRoute = sSubmixRoutes[mPortId];
	}
	}
	// If route is not available for this port, add it.
	if (mCurrentRoute == nullptr) {
	// Initialize the pipe.
	mCurrentRoute = std::make_shared<SubmixRoute>();
	if (::android::OK != mCurrentRoute->createPipe(mStreamConfig)) {
	LOG(ERROR) << __func__ << ": create pipe failed";
	return mStatus;
	}
	{
	std::lock_guard guard(sSubmixRoutesLock);
	sSubmixRoutes.emplace(mPortId, mCurrentRoute);
	}
	} else {
	if (!mCurrentRoute->isStreamConfigValid(mIsInput, mStreamConfig)) {
	LOG(ERROR) << __func__ << ": invalid stream config";
	return mStatus;
	}
	sp<MonoPipe> sink = mCurrentRoute->getSink();
	if (sink == nullptr) {
	LOG(ERROR) << __func__ << ": nullptr sink when opening stream";
	return mStatus;
	}
	// If the sink has been shutdown or pipe recreation is forced, delete the pipe and
	// recreate it.
	if (sink->isShutdown()) {
	LOG(DEBUG) << __func__ << ": Non-nullptr shut down sink when opening stream";
	if (::android::OK != mCurrentRoute->resetPipe()) {
	LOG(ERROR) << __func__ << ": reset pipe failed";
	return mStatus;
	}
	}
	}

	mCurrentRoute->openStream(mIsInput);
	mStatus = ::android::OK;
	return mStatus;
	}

	::android::status_t StreamRemoteSubmix::drain(StreamDescriptor::DrainMode) {
	usleep(1000);
	return ::android::OK;
	}

	::android::status_t StreamRemoteSubmix::flush() {
	usleep(1000);
	return ::android::OK;
	}

	::android::status_t StreamRemoteSubmix::pause() {
	usleep(1000);
	return ::android::OK;
	}

	ndk::ScopedAStatus StreamRemoteSubmix::prepareToClose() {
	if (!mIsInput) {
	std::shared_ptr<SubmixRoute> route = nullptr;
	{
	std::lock_guard guard(sSubmixRoutesLock);
	if (sSubmixRoutes.find(mPortId) != sSubmixRoutes.end()) {
	route = sSubmixRoutes[mPortId];
	}
	}
	if (route != nullptr) {
	sp<MonoPipe> sink = route->getSink();
	if (sink == nullptr) {
	ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	LOG(DEBUG) << __func__ << ": shutting down MonoPipe sink";

	sink->shutdown(true);
	} else {
	LOG(DEBUG) << __func__ << ": stream already closed.";
	ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
	}
	}
	return ndk::ScopedAStatus::ok();
	}

	// Remove references to the specified input and output streams. When the device no longer
	// references input and output streams destroy the associated pipe.
	void StreamRemoteSubmix::shutdown() {
	mCurrentRoute->closeStream(mIsInput);
	// If all stream instances are closed, we can remove route information for this port.
	if (!mCurrentRoute->hasAtleastOneStreamOpen()) {
	mCurrentRoute->releasePipe();
	LOG(DEBUG) << __func__ << ": pipe destroyed";

	std::lock_guard guard(sSubmixRoutesLock);
	sSubmixRoutes.erase(mPortId);
	mStatus = ::android::NO_INIT;
	}
	}

	::android::status_t StreamRemoteSubmix::transfer(void* buffer, size_t frameCount,
	size_t* actualFrameCount, int32_t* latencyMs) {
	if (mStatus != ::android::OK) {
	LOG(ERROR) << __func__ << ": failed, not configured";
	return ::android::NO_INIT;
	}

	latencyMs = (getStreamPipeSizeInFrames() MILLIS_PER_SECOND) / mStreamConfig.sampleRate;
	LOG(VERBOSE) << __func__ << ": Latency " << *latencyMs << "ms";

	sp<MonoPipe> sink = mCurrentRoute->getSink();
	if (sink != nullptr) {
	if (sink->isShutdown()) {
	sink.clear();
	LOG(VERBOSE) << __func__ << ": pipe shutdown, ignoring the transfer.";
	// the pipe has already been shutdown, this buffer will be lost but we must simulate
	// timing so we don't drain the output faster than realtime
	const size_t delayUs = static_cast<size_t>(
	std::roundf(frameCount * MICROS_PER_SECOND / mStreamConfig.sampleRate));
	usleep(delayUs);

	*actualFrameCount = frameCount;
	return ::android::OK;
	}
	} else {
	LOG(ERROR) << __func__ << ": transfer without a pipe!";
	return ::android::UNEXPECTED_NULL;
	}

	mCurrentRoute->exitStandby(mIsInput);
	return (mIsInput ? inRead(buffer, frameCount, actualFrameCount)
	: outWrite(buffer, frameCount, actualFrameCount));
	}

	// Calculate the maximum size of the pipe buffer in frames for the specified stream.
	size_t StreamRemoteSubmix::getStreamPipeSizeInFrames() {
	auto pipeConfig = mCurrentRoute->mPipeConfig;
	const size_t maxFrameSize = std::max(mStreamConfig.frameSize, pipeConfig.frameSize);
	return (pipeConfig.frameCount * pipeConfig.frameSize) / maxFrameSize;
	}

	::android::status_t StreamRemoteSubmix::outWrite(void* buffer, size_t frameCount,
	size_t* actualFrameCount) {
	sp<MonoPipe> sink = mCurrentRoute->getSink();
	if (sink != nullptr) {
	if (sink->isShutdown()) {
	sink.clear();
	LOG(VERBOSE) << __func__ << ": pipe shutdown, ignoring the write.";
	// the pipe has already been shutdown, this buffer will be lost but we must
	// simulate timing so we don't drain the output faster than realtime
	const size_t delayUs = static_cast<size_t>(
	std::roundf(frameCount * MICROS_PER_SECOND / mStreamConfig.sampleRate));
	usleep(delayUs);
	*actualFrameCount = frameCount;
	return ::android::OK;
	}
	} else {
	LOG(FATAL) << __func__ << ": without a pipe!";
	return ::android::UNKNOWN_ERROR;
	}

	const size_t availableToWrite = sink->availableToWrite();
	// NOTE: sink has been checked above and sink and source life cycles are synchronized
	sp<MonoPipeReader> source = mCurrentRoute->getSource();
	// If the write to the sink should be blocked, flush enough frames from the pipe to make space
	// to write the most recent data.
	if (!mCurrentRoute->shouldBlockWrite() && availableToWrite < frameCount) {
	static uint8_t flushBuffer[64];
	const size_t flushBufferSizeFrames = sizeof(flushBuffer) / mStreamConfig.frameSize;
	size_t framesToFlushFromSource = frameCount - availableToWrite;
	LOG(VERBOSE) << __func__ << ": flushing " << framesToFlushFromSource
	<< " frames from the pipe to avoid blocking";
	while (framesToFlushFromSource) {
	const size_t flushSize = std::min(framesToFlushFromSource, flushBufferSizeFrames);
	framesToFlushFromSource -= flushSize;
	// read does not block
	source->read(flushBuffer, flushSize);
	}
	}

	ssize_t writtenFrames = sink->write(buffer, frameCount);
	if (writtenFrames < 0) {
	if (writtenFrames == (ssize_t)::android::NEGOTIATE) {
	LOG(ERROR) << __func__ << ": write to pipe returned NEGOTIATE";
	sink.clear();
	*actualFrameCount = 0;
	return ::android::UNKNOWN_ERROR;
	} else {
	// write() returned UNDERRUN or WOULD_BLOCK, retry
	LOG(ERROR) << __func__ << ": write to pipe returned unexpected " << writtenFrames;
	writtenFrames = sink->write(buffer, frameCount);
	}
	}
	sink.clear();

	if (writtenFrames < 0) {
	LOG(ERROR) << __func__ << ": failed writing to pipe with " << writtenFrames;
	*actualFrameCount = 0;
	return ::android::UNKNOWN_ERROR;
	}
	LOG(VERBOSE) << __func__ << ": wrote " << writtenFrames << "frames";
	*actualFrameCount = writtenFrames;
	return ::android::OK;
	}

	::android::status_t StreamRemoteSubmix::inRead(void* buffer, size_t frameCount,
	size_t* actualFrameCount) {
	// about to read from audio source
	sp<MonoPipeReader> source = mCurrentRoute->getSource();
	if (source == nullptr) {
	int readErrorCount = mCurrentRoute->notifyReadError();
	if (readErrorCount < kMaxReadErrorLogs) {
	LOG(ERROR)
	<< __func__
	<< ": no audio pipe yet we're trying to read! (not all errors will be logged)";
	} else {
	LOG(ERROR) << __func__ << ": Read errors " << readErrorCount;
	}
	const size_t delayUs = static_cast<size_t>(
	std::roundf(frameCount * MICROS_PER_SECOND / mStreamConfig.sampleRate));
	usleep(delayUs);
	memset(buffer, 0, mStreamConfig.frameSize * frameCount);
	*actualFrameCount = frameCount;
	return ::android::OK;
	}

	// read the data from the pipe
	int attempts = 0;
	const size_t delayUs = static_cast<size_t>(std::roundf(kReadAttemptSleepUs));
	char* buff = (char*)buffer;
	size_t remainingFrames = frameCount;

	while ((remainingFrames > 0) && (attempts < kMaxReadFailureAttempts)) {
	LOG(VERBOSE) << __func__ << ": frames available to read " << source->availableToRead();

	ssize_t framesRead = source->read(buff, remainingFrames);

	LOG(VERBOSE) << __func__ << ": frames read " << framesRead;

	if (framesRead > 0) {
	remainingFrames -= framesRead;
	buff += framesRead * mStreamConfig.frameSize;
	LOG(VERBOSE) << __func__ << ": (attempts = " << attempts << ") got " << framesRead
	<< " frames, remaining=" << remainingFrames;
	} else {
	attempts++;
	LOG(WARNING) << __func__ << ": read returned " << framesRead
	<< " , read failure attempts = " << attempts;
	usleep(delayUs);
	}
	}
	// done using the source
	source.clear();

	if (remainingFrames > 0) {
	const size_t remainingBytes = remainingFrames * mStreamConfig.frameSize;
	LOG(VERBOSE) << __func__ << ": clearing remaining_frames = " << remainingFrames;
	memset(((char)buffer) + (mStreamConfig.frameSize frameCount) - remainingBytes, 0,
	remainingBytes);
	}

	long readCounterFrames = mCurrentRoute->updateReadCounterFrames(frameCount);
	*actualFrameCount = frameCount;

	// compute how much we need to sleep after reading the data by comparing the wall clock with
	// the projected time at which we should return.
	// wall clock after reading from the pipe
	auto recordDurationUs = std::chrono::steady_clock::now() - mCurrentRoute->getRecordStartTime();

	// readCounterFrames contains the number of frames that have been read since the beginning of
	// recording (including this call): it's converted to usec and compared to how long we've been
	// recording for, which gives us how long we must wait to sync the projected recording time, and
	// the observed recording time.
	static constexpr float kScaleFactor = .8f;
	const size_t projectedVsObservedOffsetUs =
	kScaleFactor * (static_cast<size_t>(std::roundf((readCounterFrames * MICROS_PER_SECOND /
	mStreamConfig.sampleRate) -
	recordDurationUs.count())));

	LOG(VERBOSE) << __func__ << ": record duration " << recordDurationUs.count()
	<< " microseconds, will wait: " << projectedVsObservedOffsetUs << " microseconds";
	if (projectedVsObservedOffsetUs > 0) {
	usleep(projectedVsObservedOffsetUs);
	}
	return ::android::OK;
	}

	::android::status_t StreamRemoteSubmix::standby() {
	mCurrentRoute->standby(mIsInput);
	return ::android::OK;
	}

	StreamInRemoteSubmix::StreamInRemoteSubmix(const SinkMetadata& sinkMetadata,
	StreamContext&& context,
	const std::vector<MicrophoneInfo>& microphones)
	: StreamRemoteSubmix(sinkMetadata, std::move(context)), StreamIn(microphones) {}

	ndk::ScopedAStatus StreamInRemoteSubmix::getActiveMicrophones(
	std::vector<MicrophoneDynamicInfo>* _aidl_return) {
	LOG(DEBUG) << __func__ << ": not supported";
	*_aidl_return = std::vector<MicrophoneDynamicInfo>();
	return ndk::ScopedAStatus::ok();
	}

	StreamOutRemoteSubmix::StreamOutRemoteSubmix(const SourceMetadata& sourceMetadata,
	StreamContext&& context,
	const std::optional<AudioOffloadInfo>& offloadInfo)
	: StreamRemoteSubmix(sourceMetadata, std::move(context)), StreamOut(offloadInfo) {}

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