Add AAudioCommandQueue in aaudio service. (2a59462f) · Commits · e / os / android_frameworks_av

services/oboeservice/AAudioCommandQueue.cpp

0 → 100644

+85 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2021 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 "AAudioCommandQueue"
		//#define LOG_NDEBUG 0

		#include <chrono>

		#include <utils/Log.h>

		#include "AAudioCommandQueue.h"

		namespace aaudio {

		aaudio_result_t AAudioCommandQueue::sendCommand(std::shared_ptr<AAudioCommand> command) {
		{
		std::scoped_lock<std::mutex> _l(mLock);
		mCommands.push(command);
		mWaitWorkCond.notify_one();
		}

		std::unique_lock _cl(command->lock);
		android::base::ScopedLockAssertion lockAssertion(command->lock);
		ALOGV("Sending command %d, wait for reply(%d) with timeout %jd",
		command->operationCode, command->isWaitingForReply, command->timeoutNanoseconds);
		// `mWaitForReply` is first initialized when the command is constructed. It will be flipped
		// when the command is completed.
		auto timeoutExpire = std::chrono::steady_clock::now()
		+ std::chrono::nanoseconds(command->timeoutNanoseconds);
		while (command->isWaitingForReply) {
		if (command->conditionVariable.wait_until(_cl, timeoutExpire)
		== std::cv_status::timeout) {
		ALOGD("Command %d time out", command->operationCode);
		command->result = AAUDIO_ERROR_TIMEOUT;
		command->isWaitingForReply = false;
		}
		}
		ALOGV("Command %d sent with result as %d", command->operationCode, command->result);
		return command->result;
		}

		std::shared_ptr<AAudioCommand> AAudioCommandQueue::waitForCommand(int64_t timeoutNanos) {
		std::shared_ptr<AAudioCommand> command;
		{
		std::unique_lock _l(mLock);
		android::base::ScopedLockAssertion lockAssertion(mLock);
		if (timeoutNanos >= 0) {
		mWaitWorkCond.wait_for(_l, std::chrono::nanoseconds(timeoutNanos), [this]() {
		android::base::ScopedLockAssertion lockAssertion(mLock);
		return !mRunning \|\| !mCommands.empty();
		});
		} else {
		mWaitWorkCond.wait(_l, [this]() {
		android::base::ScopedLockAssertion lockAssertion(mLock);
		return !mRunning \|\| !mCommands.empty();
		});
		}
		if (!mCommands.empty()) {
		command = mCommands.front();
		mCommands.pop();
		}
		}
		return command;
		}

		void AAudioCommandQueue::stopWaiting() {
		std::scoped_lock<std::mutex> _l(mLock);
		mRunning = false;
		mWaitWorkCond.notify_one();
		}

		} // namespace aaudio
		No newline at end of file

services/oboeservice/AAudioCommandQueue.h

0 → 100644

+93 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2021 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 <condition_variable>
		#include <memory>
		#include <mutex>
		#include <queue>

		#include <aaudio/AAudio.h>
		#include <android-base/thread_annotations.h>

		namespace aaudio {

		typedef int32_t aaudio_command_opcode;

		class AAudioCommandParam {
		public:
		AAudioCommandParam() = default;
		virtual ~AAudioCommandParam() = default;
		};

		class AAudioCommand {
		public:
		explicit AAudioCommand(
		aaudio_command_opcode opCode, std::shared_ptr<AAudioCommandParam> param = nullptr,
		bool waitForReply = false, int64_t timeoutNanos = 0)
		: operationCode(opCode), parameter(param), isWaitingForReply(waitForReply),
		timeoutNanoseconds(timeoutNanos) { }
		virtual ~AAudioCommand() = default;

		std::mutex lock;
		std::condition_variable conditionVariable;

		const aaudio_command_opcode operationCode;
		std::shared_ptr<AAudioCommandParam> parameter;
		bool isWaitingForReply GUARDED_BY(lock);
		const int64_t timeoutNanoseconds;
		aaudio_result_t result GUARDED_BY(lock) = AAUDIO_OK;
		};

		class AAudioCommandQueue {
		public:
		AAudioCommandQueue() = default;
		~AAudioCommandQueue() = default;

		/**
		* Send a command to the command queue. The return will be waiting for a specified timeout
		* period indicated by the command if it is required.
		*
		* @param command the command to send to the command queue.
		* @return the result of sending the command or the result of executing the command if command
		* need to wait for a reply. If timeout happens, AAUDIO_ERROR_TIMEOUT will be returned.
		*/
		aaudio_result_t sendCommand(std::shared_ptr<AAudioCommand> command);

		/**
		* Wait for next available command OR until the timeout is expired.
		*
		* @param timeoutNanos the maximum time to wait for next command (0 means return immediately in
		* any case), negative to wait forever.
		* @return the next available command if any or a nullptr when there is none.
		*/
		std::shared_ptr<AAudioCommand> waitForCommand(int64_t timeoutNanos = -1);

		/**
		* Force stop waiting for next command
		*/
		void stopWaiting();

		private:
		std::mutex mLock;
		std::condition_variable mWaitWorkCond;

		std::queue<std::shared_ptr<AAudioCommand>> mCommands GUARDED_BY(mLock);
		bool mRunning GUARDED_BY(mLock) = true;
		};

		} // namespace aaudio
		No newline at end of file

services/oboeservice/AAudioServiceEndpointMMAP.cpp

+7 −6

Original line number	Diff line number	Diff line
		@@ -401,16 +401,17 @@ void AAudioServiceEndpointMMAP::onRoutingChanged(audio_port_handle_t portHandle)
		/**
		* Get an immutable description of the data queue from the HAL.
		*/
		aaudio_result_t AAudioServiceEndpointMMAP::getDownDataDescription(AudioEndpointParcelable &parcelable)
		aaudio_result_t AAudioServiceEndpointMMAP::getDownDataDescription(
		AudioEndpointParcelable* parcelable)
		{
		// Gather information on the data queue based on HAL info.
		int32_t bytesPerFrame = calculateBytesPerFrame();
		int32_t capacityInBytes = getBufferCapacity() * bytesPerFrame;
		int fdIndex = parcelable.addFileDescriptor(mAudioDataFileDescriptor, capacityInBytes);
		parcelable.mDownDataQueueParcelable.setupMemory(fdIndex, 0, capacityInBytes);
		parcelable.mDownDataQueueParcelable.setBytesPerFrame(bytesPerFrame);
		parcelable.mDownDataQueueParcelable.setFramesPerBurst(mFramesPerBurst);
		parcelable.mDownDataQueueParcelable.setCapacityInFrames(getBufferCapacity());
		int fdIndex = parcelable->addFileDescriptor(mAudioDataFileDescriptor, capacityInBytes);
		parcelable->mDownDataQueueParcelable.setupMemory(fdIndex, 0, capacityInBytes);
		parcelable->mDownDataQueueParcelable.setBytesPerFrame(bytesPerFrame);
		parcelable->mDownDataQueueParcelable.setFramesPerBurst(mFramesPerBurst);
		parcelable->mDownDataQueueParcelable.setCapacityInFrames(getBufferCapacity());
		return AAUDIO_OK;
		}

services/oboeservice/AAudioServiceEndpointMMAP.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -79,7 +79,7 @@ public:
		void onRoutingChanged(audio_port_handle_t portHandle) override;
		// ------------------------------------------------------------------------------

		aaudio_result_t getDownDataDescription(AudioEndpointParcelable &parcelable);
		aaudio_result_t getDownDataDescription(AudioEndpointParcelable* parcelable);

		int64_t getHardwareTimeOffsetNanos() const {
		return mHardwareTimeOffsetNanos;

services/oboeservice/AAudioServiceStreamBase.cpp

+173 −79

Original line number	Diff line number	Diff line
		@@ -34,23 +34,25 @@
		#include "AAudioService.h"
		#include "AAudioServiceEndpoint.h"
		#include "AAudioServiceStreamBase.h"
		#include "TimestampScheduler.h"

		using namespace android; // TODO just import names needed
		using namespace aaudio; // TODO just import names needed

		using content::AttributionSourceState;

		static const int64_t TIMEOUT_NANOS = 3LL * 1000 * 1000 * 1000;

		/**
		* Base class for streams in the service.
		* @return
		*/

		AAudioServiceStreamBase::AAudioServiceStreamBase(AAudioService &audioService)
		: mTimestampThread("AATime")
		: mCommandThread("AACommand")
		, mAtomicStreamTimestamp()
		, mAudioService(audioService) {
		mMmapClient.attributionSource = AttributionSourceState();
		mThreadEnabled = true;
		}

		AAudioServiceStreamBase::~AAudioServiceStreamBase() {
		@@ -70,6 +72,13 @@ AAudioServiceStreamBase::~AAudioServiceStreamBase() {
		\|\| getState() == AAUDIO_STREAM_STATE_UNINITIALIZED),
		"service stream %p still open, state = %d",
		this, getState());

		// Stop the command thread before destroying.
		if (mThreadEnabled) {
		mThreadEnabled = false;
		mCommandQueue.stopWaiting();
		mCommandThread.stop();
		}
		}

		std::string AAudioServiceStreamBase::dumpHeader() {
		@@ -166,6 +175,16 @@ aaudio_result_t AAudioServiceStreamBase::open(const aaudio::AAudioStreamRequest
		mFramesPerBurst = mServiceEndpoint->getFramesPerBurst();
		copyFrom(*mServiceEndpoint);
		}

		// Make sure this object does not get deleted before the run() method
		// can protect it by making a strong pointer.
		mThreadEnabled = true;
		incStrong(nullptr); // See run() method.
		result = mCommandThread.start(this);
		if (result != AAUDIO_OK) {
		decStrong(nullptr); // run() can't do it so we have to do it here.
		goto error;
		}
		return result;

		error:
		@@ -174,8 +193,16 @@ error:
		}

		aaudio_result_t AAudioServiceStreamBase::close() {
		std::lock_guard<std::mutex> lock(mLock);
		return close_l();
		auto command = std::make_shared<AAudioCommand>(
		CLOSE, nullptr, true /waitForReply/, TIMEOUT_NANOS);
		aaudio_result_t result = mCommandQueue.sendCommand(command);

		// Stop the command thread as the stream is closed.
		mThreadEnabled = false;
		mCommandQueue.stopWaiting();
		mCommandThread.stop();

		return result;
		}

		aaudio_result_t AAudioServiceStreamBase::close_l() {
		@@ -183,8 +210,7 @@ aaudio_result_t AAudioServiceStreamBase::close_l() {
		return AAUDIO_OK;
		}

		// This will call stopTimestampThread() and also stop the stream,
		// just in case it was not already stopped.
		// This will stop the stream, just in case it was not already stopped.
		stop_l();

		aaudio_result_t result = AAUDIO_OK;
		@@ -224,8 +250,12 @@ aaudio_result_t AAudioServiceStreamBase::startDevice() {
		* An AAUDIO_SERVICE_EVENT_STARTED will be sent to the client when complete.
		*/
		aaudio_result_t AAudioServiceStreamBase::start() {
		std::lock_guard<std::mutex> lock(mLock);
		auto command = std::make_shared<AAudioCommand>(
		START, nullptr, true /waitForReply/, TIMEOUT_NANOS);
		return mCommandQueue.sendCommand(command);
		}

		aaudio_result_t AAudioServiceStreamBase::start_l() {
		const int64_t beginNs = AudioClock::getNanoseconds();
		aaudio_result_t result = AAUDIO_OK;

		@@ -261,15 +291,6 @@ aaudio_result_t AAudioServiceStreamBase::start() {
		// This should happen at the end of the start.
		sendServiceEvent(AAUDIO_SERVICE_EVENT_STARTED);
		setState(AAUDIO_STREAM_STATE_STARTED);
		mThreadEnabled.store(true);
		// Make sure this object does not get deleted before the run() method
		// can protect it by making a strong pointer.
		incStrong(nullptr); // See run() method.
		result = mTimestampThread.start(this);
		if (result != AAUDIO_OK) {
		decStrong(nullptr); // run() can't do it so we have to do it here.
		goto error;
		}

		return result;

		@@ -279,8 +300,9 @@ error:
		}

		aaudio_result_t AAudioServiceStreamBase::pause() {
		std::lock_guard<std::mutex> lock(mLock);
		return pause_l();
		auto command = std::make_shared<AAudioCommand>(
		PAUSE, nullptr, true /waitForReply/, TIMEOUT_NANOS);
		return mCommandQueue.sendCommand(command);
		}

		aaudio_result_t AAudioServiceStreamBase::pause_l() {
		@@ -298,12 +320,6 @@ aaudio_result_t AAudioServiceStreamBase::pause_l() {
		.set(AMEDIAMETRICS_PROP_STATUS, (int32_t)result)
		.record(); });

		result = stopTimestampThread();
		if (result != AAUDIO_OK) {
		disconnect_l();
		return result;
		}

		sp<AAudioServiceEndpoint> endpoint = mServiceEndpointWeak.promote();
		if (endpoint == nullptr) {
		ALOGE("%s() has no endpoint", __func__);
		@@ -322,8 +338,9 @@ aaudio_result_t AAudioServiceStreamBase::pause_l() {
		}

		aaudio_result_t AAudioServiceStreamBase::stop() {
		std::lock_guard<std::mutex> lock(mLock);
		return stop_l();
		auto command = std::make_shared<AAudioCommand>(
		STOP, nullptr, true /waitForReply/, TIMEOUT_NANOS);
		return mCommandQueue.sendCommand(command);
		}

		aaudio_result_t AAudioServiceStreamBase::stop_l() {
		@@ -343,12 +360,6 @@ aaudio_result_t AAudioServiceStreamBase::stop_l() {

		setState(AAUDIO_STREAM_STATE_STOPPING);

		// Temporarily unlock because we are joining the timestamp thread and it may try
		// to acquire mLock.
		mLock.unlock();
		result = stopTimestampThread();
		mLock.lock();

		if (result != AAUDIO_OK) {
		disconnect_l();
		return result;
		@@ -373,17 +384,13 @@ aaudio_result_t AAudioServiceStreamBase::stop_l() {
		return result;
		}

		aaudio_result_t AAudioServiceStreamBase::stopTimestampThread() {
		aaudio_result_t result = AAUDIO_OK;
		// clear flag that tells thread to loop
		if (mThreadEnabled.exchange(false)) {
		result = mTimestampThread.stop();
		}
		return result;
		aaudio_result_t AAudioServiceStreamBase::flush() {
		auto command = std::make_shared<AAudioCommand>(
		FLUSH, nullptr, true /waitForReply/, TIMEOUT_NANOS);
		return mCommandQueue.sendCommand(command);
		}

		aaudio_result_t AAudioServiceStreamBase::flush() {
		std::lock_guard<std::mutex> lock(mLock);
		aaudio_result_t AAudioServiceStreamBase::flush_l() {
		aaudio_result_t result = AAudio_isFlushAllowed(getState());
		if (result != AAUDIO_OK) {
		return result;
		@@ -404,48 +411,111 @@ aaudio_result_t AAudioServiceStreamBase::flush() {
		return AAUDIO_OK;
		}

		// implement Runnable, periodically send timestamps to client
		// implement Runnable, periodically send timestamps to client and process commands from queue.
		__attribute__((no_sanitize("integer")))
		void AAudioServiceStreamBase::run() {
		ALOGD("%s() %s entering >>>>>>>>>>>>>> TIMESTAMPS", __func__, getTypeText());
		ALOGD("%s() %s entering >>>>>>>>>>>>>> COMMANDS", __func__, getTypeText());
		// Hold onto the ref counted stream until the end.
		android::sp<AAudioServiceStreamBase> holdStream(this);
		TimestampScheduler timestampScheduler;
		int64_t nextTime;
		// Balance the incStrong from when the thread was launched.
		holdStream->decStrong(nullptr);

		timestampScheduler.setBurstPeriod(mFramesPerBurst, getSampleRate());
		timestampScheduler.start(AudioClock::getNanoseconds());
		int64_t nextTime = timestampScheduler.nextAbsoluteTime();
		// Taking mLock while starting the thread. All the operation must be able to
		// run with holding the lock.
		std::scoped_lock<std::mutex> _l(mLock);

		int32_t loopCount = 0;
		aaudio_result_t result = AAUDIO_OK;
		while (mThreadEnabled.load()) {
		loopCount++;
		if (AudioClock::getNanoseconds() >= nextTime) {
		result = sendCurrentTimestamp();
		if (result != AAUDIO_OK) {
		ALOGE("%s() timestamp thread got result = %d", __func__, result);
		int64_t timeoutNanos = -1;
		if (isRunning()) {
		timeoutNanos = nextTime - AudioClock::getNanoseconds();
		timeoutNanos = std::max<int64_t>(0, timeoutNanos);
		}

		auto command = mCommandQueue.waitForCommand(timeoutNanos);
		if (!mThreadEnabled) {
		// Break the loop if the thread is disabled.
		break;
		}
		nextTime = timestampScheduler.nextAbsoluteTime();

		if (isRunning() && AudioClock::getNanoseconds() >= nextTime) {
		// It is time to update timestamp.
		if (sendCurrentTimestamp_l() != AAUDIO_OK) {
		ALOGE("Failed to send current timestamp, stop updating timestamp");
		disconnect_l();
		} else {
		// Sleep until it is time to send the next timestamp.
		// TODO Wait for a signal with a timeout so that we can stop more quickly.
		AudioClock::sleepUntilNanoTime(nextTime);
		nextTime = timestampScheduler.nextAbsoluteTime();
		}
		}
		// This was moved from the calls in stop_l() and pause_l(), which could cause a deadlock
		// if it resulted in a call to disconnect.
		if (result == AAUDIO_OK) {
		(void) sendCurrentTimestamp();

		if (command != nullptr) {
		std::scoped_lock<std::mutex> _commandLock(command->lock);
		switch (command->operationCode) {
		case START:
		command->result = start_l();
		timestampScheduler.setBurstPeriod(mFramesPerBurst, getSampleRate());
		timestampScheduler.start(AudioClock::getNanoseconds());
		nextTime = timestampScheduler.nextAbsoluteTime();
		break;
		case PAUSE:
		command->result = pause_l();
		break;
		case STOP:
		command->result = stop_l();
		break;
		case FLUSH:
		command->result = flush_l();
		break;
		case CLOSE:
		command->result = close_l();
		break;
		case DISCONNECT:
		disconnect_l();
		break;
		case REGISTER_AUDIO_THREAD: {
		RegisterAudioThreadParam *param =
		(RegisterAudioThreadParam *) command->parameter.get();
		command->result =
		param == nullptr ? AAUDIO_ERROR_ILLEGAL_ARGUMENT
		: registerAudioThread_l(param->mOwnerPid,
		param->mClientThreadId,
		param->mPriority);
		}
		ALOGD("%s() %s exiting after %d loops <<<<<<<<<<<<<< TIMESTAMPS",
		break;
		case UNREGISTER_AUDIO_THREAD: {
		UnregisterAudioThreadParam *param =
		(UnregisterAudioThreadParam *) command->parameter.get();
		command->result =
		param == nullptr ? AAUDIO_ERROR_ILLEGAL_ARGUMENT
		: unregisterAudioThread_l(param->mClientThreadId);
		}
		break;
		case GET_DESCRIPTION: {
		GetDescriptionParam param = (GetDescriptionParam ) command->parameter.get();
		command->result = param == nullptr ? AAUDIO_ERROR_ILLEGAL_ARGUMENT
		: getDescription_l(param->mParcelable);
		}
		break;
		default:
		ALOGE("Invalid command op code: %d", command->operationCode);
		break;
		}
		if (command->isWaitingForReply) {
		command->isWaitingForReply = false;
		command->conditionVariable.notify_one();
		}
		}
		}
		ALOGD("%s() %s exiting after %d loops <<<<<<<<<<<<<< COMMANDS",
		__func__, getTypeText(), loopCount);
		}

		void AAudioServiceStreamBase::disconnect() {
		std::lock_guard<std::mutex> lock(mLock);
		disconnect_l();
		auto command = std::make_shared<AAudioCommand>(DISCONNECT);
		mCommandQueue.sendCommand(command);
		}

		void AAudioServiceStreamBase::disconnect_l() {
		@@ -461,15 +531,23 @@ void AAudioServiceStreamBase::disconnect_l() {
		}
		}

		aaudio_result_t AAudioServiceStreamBase::registerAudioThread(pid_t clientThreadId,
		int priority) {
		std::lock_guard<std::mutex> lock(mLock);
		aaudio_result_t AAudioServiceStreamBase::registerAudioThread(pid_t clientThreadId, int priority) {
		const pid_t ownerPid = IPCThreadState::self()->getCallingPid(); // TODO review
		auto command = std::make_shared<AAudioCommand>(
		REGISTER_AUDIO_THREAD,
		std::make_shared<RegisterAudioThreadParam>(ownerPid, clientThreadId, priority),
		true /waitForReply/,
		TIMEOUT_NANOS);
		return mCommandQueue.sendCommand(command);
		}

		aaudio_result_t AAudioServiceStreamBase::registerAudioThread_l(
		pid_t ownerPid, pid_t clientThreadId, int priority) {
		aaudio_result_t result = AAUDIO_OK;
		if (getRegisteredThread() != AAudioServiceStreamBase::ILLEGAL_THREAD_ID) {
		ALOGE("AAudioService::registerAudioThread(), thread already registered");
		result = AAUDIO_ERROR_INVALID_STATE;
		} else {
		const pid_t ownerPid = IPCThreadState::self()->getCallingPid(); // TODO review
		setRegisteredThread(clientThreadId);
		int err = android::requestPriority(ownerPid, clientThreadId,
		priority, true /* isForApp */);
		@@ -483,7 +561,15 @@ aaudio_result_t AAudioServiceStreamBase::registerAudioThread(pid_t clientThreadI
		}

		aaudio_result_t AAudioServiceStreamBase::unregisterAudioThread(pid_t clientThreadId) {
		std::lock_guard<std::mutex> lock(mLock);
		auto command = std::make_shared<AAudioCommand>(
		UNREGISTER_AUDIO_THREAD,
		std::make_shared<UnregisterAudioThreadParam>(clientThreadId),
		true /waitForReply/,
		TIMEOUT_NANOS);
		return mCommandQueue.sendCommand(command);
		}

		aaudio_result_t AAudioServiceStreamBase::unregisterAudioThread_l(pid_t clientThreadId) {
		aaudio_result_t result = AAUDIO_OK;
		if (getRegisteredThread() != clientThreadId) {
		ALOGE("%s(), wrong thread", __func__);
		@@ -552,7 +638,7 @@ aaudio_result_t AAudioServiceStreamBase::sendXRunCount(int32_t xRunCount) {
		return sendServiceEvent(AAUDIO_SERVICE_EVENT_XRUN, (int64_t) xRunCount);
		}

		aaudio_result_t AAudioServiceStreamBase::sendCurrentTimestamp() {
		aaudio_result_t AAudioServiceStreamBase::sendCurrentTimestamp_l() {
		AAudioServiceMessage command;
		// It is not worth filling up the queue with timestamps.
		// That can cause the stream to get suspended.
		@@ -562,7 +648,7 @@ aaudio_result_t AAudioServiceStreamBase::sendCurrentTimestamp() {
		}

		// Send a timestamp for the clock model.
		aaudio_result_t result = getFreeRunningPosition(&command.timestamp.position,
		aaudio_result_t result = getFreeRunningPosition_l(&command.timestamp.position,
		&command.timestamp.timestamp);
		if (result == AAUDIO_OK) {
		ALOGV("%s() SERVICE %8lld at %lld", __func__,
		@@ -573,7 +659,7 @@ aaudio_result_t AAudioServiceStreamBase::sendCurrentTimestamp() {

		if (result == AAUDIO_OK) {
		// Send a hardware timestamp for presentation time.
		result = getHardwareTimestamp(&command.timestamp.position,
		result = getHardwareTimestamp_l(&command.timestamp.position,
		&command.timestamp.timestamp);
		if (result == AAUDIO_OK) {
		ALOGV("%s() HARDWARE %8lld at %lld", __func__,
		@@ -596,7 +682,15 @@ aaudio_result_t AAudioServiceStreamBase::sendCurrentTimestamp() {
		* used to communicate with the underlying HAL or Service.
		*/
		aaudio_result_t AAudioServiceStreamBase::getDescription(AudioEndpointParcelable &parcelable) {
		std::lock_guard<std::mutex> lock(mLock);
		auto command = std::make_shared<AAudioCommand>(
		GET_DESCRIPTION,
		std::make_shared<GetDescriptionParam>(&parcelable),
		true /waitForReply/,
		TIMEOUT_NANOS);
		return mCommandQueue.sendCommand(command);
		}

		aaudio_result_t AAudioServiceStreamBase::getDescription_l(AudioEndpointParcelable* parcelable) {
		{
		std::lock_guard<std::mutex> lock(mUpMessageQueueLock);
		if (mUpMessageQueue == nullptr) {
		@@ -605,9 +699,9 @@ aaudio_result_t AAudioServiceStreamBase::getDescription(AudioEndpointParcelable
		}
		// Gather information on the message queue.
		mUpMessageQueue->fillParcelable(parcelable,
		parcelable.mUpMessageQueueParcelable);
		parcelable->mUpMessageQueueParcelable);
		}
		return getAudioDataDescription(parcelable);
		return getAudioDataDescription_l(parcelable);
		}

		void AAudioServiceStreamBase::onVolumeChanged(float volume) {