modules/audio_device/win/audio_device_module_win.cc - src - Git at Google

 /*
  *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 #include "modules/audio_device/win/audio_device_module_win.h"

 #include <memory>
 #include <utility>

 #include "api/make_ref_counted.h"
 #include "api/sequence_checker.h"
 #include "modules/audio_device/audio_device_buffer.h"
 #include "modules/audio_device/include/audio_device.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/string_utils.h"

 namespace webrtc {
 namespace webrtc_win {
 namespace {

 #define RETURN_IF_OUTPUT_RESTARTS(...) \
   do {                                 \
     if (output_->Restarting()) {       \
       return __VA_ARGS__;              \
     }                                  \
   } while (0)

 #define RETURN_IF_INPUT_RESTARTS(...) \
   do {                                \
     if (input_->Restarting()) {       \
       return __VA_ARGS__;             \
     }                                 \
   } while (0)

 #define RETURN_IF_OUTPUT_IS_INITIALIZED(...) \
   do {                                       \
     if (output_->PlayoutIsInitialized()) {   \
       return __VA_ARGS__;                    \
     }                                        \
   } while (0)

 #define RETURN_IF_INPUT_IS_INITIALIZED(...) \
   do {                                      \
     if (input_->RecordingIsInitialized()) { \
       return __VA_ARGS__;                   \
     }                                       \
   } while (0)

 #define RETURN_IF_OUTPUT_IS_ACTIVE(...) \
   do {                                  \
     if (output_->Playing()) {           \
       return __VA_ARGS__;               \
     }                                   \
   } while (0)

 #define RETURN_IF_INPUT_IS_ACTIVE(...) \
   do {                                 \
     if (input_->Recording()) {         \
       return __VA_ARGS__;              \
     }                                  \
   } while (0)

 // This class combines a generic instance of an AudioInput and a generic
 // instance of an AudioOutput to create an AudioDeviceModule. This is mostly
 // done by delegating to the audio input/output with some glue code. This class
 // also directly implements some of the AudioDeviceModule methods with dummy
 // implementations.
 //
 // An instance must be created, destroyed and used on one and the same thread,
 // i.e., all public methods must also be called on the same thread. A thread
 // checker will RTC_DCHECK if any method is called on an invalid thread.
 // TODO(henrika): is thread checking needed in AudioInput and AudioOutput?
 class WindowsAudioDeviceModule : public AudioDeviceModuleForTest {
  public:
   enum class InitStatus {
     OK = 0,
     PLAYOUT_ERROR = 1,
     RECORDING_ERROR = 2,
     OTHER_ERROR = 3,
     NUM_STATUSES = 4
   };

   WindowsAudioDeviceModule(std::unique_ptr<AudioInput> audio_input,
                            std::unique_ptr<AudioOutput> audio_output,
                            TaskQueueFactory* task_queue_factory)
       : input_(std::move(audio_input)),
         output_(std::move(audio_output)),
         task_queue_factory_(task_queue_factory) {
     RTC_CHECK(input_);
     RTC_CHECK(output_);
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
   }

   ~WindowsAudioDeviceModule() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     Terminate();
   }

   WindowsAudioDeviceModule(const WindowsAudioDeviceModule&) = delete;
   WindowsAudioDeviceModule& operator=(const WindowsAudioDeviceModule&) = delete;

   int32_t ActiveAudioLayer(
       AudioDeviceModule::AudioLayer* audioLayer) const override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     // TODO(henrika): it might be possible to remove this unique signature.
     *audioLayer = AudioDeviceModule::kWindowsCoreAudio2;
     return 0;
   }

   int32_t RegisterAudioCallback(AudioTransport* audioCallback) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK(audio_device_buffer_);
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return audio_device_buffer_->RegisterAudioCallback(audioCallback);
   }

   int32_t Init() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     RETURN_IF_INPUT_RESTARTS(0);
     if (initialized_) {
       return 0;
     }
     audio_device_buffer_ =
         std::make_unique<AudioDeviceBuffer>(task_queue_factory_);
     AttachAudioBuffer();
     InitStatus status;
     if (output_->Init() != 0) {
       status = InitStatus::PLAYOUT_ERROR;
     } else if (input_->Init() != 0) {
       output_->Terminate();
       status = InitStatus::RECORDING_ERROR;
     } else {
       initialized_ = true;
       status = InitStatus::OK;
     }
     if (status != InitStatus::OK) {
       RTC_LOG(LS_ERROR) << "Audio device initialization failed";
       return -1;
     }
     return 0;
   }

   int32_t Terminate() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     RETURN_IF_INPUT_RESTARTS(0);
     if (!initialized_)
       return 0;
     int32_t err = input_->Terminate();
     err |= output_->Terminate();
     initialized_ = false;
     RTC_DCHECK_EQ(err, 0);
     return err;
   }

   bool Initialized() const override {
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return initialized_;
   }

   int16_t PlayoutDevices() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     return output_->NumDevices();
   }

   int16_t RecordingDevices() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_INPUT_RESTARTS(0);
     return input_->NumDevices();
   }

   int32_t PlayoutDeviceName(uint16_t index,
                             char name[kAdmMaxDeviceNameSize],
                             char guid[kAdmMaxGuidSize]) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     std::string name_str, guid_str;
     int ret = -1;
     if (guid != nullptr) {
       ret = output_->DeviceName(index, &name_str, &guid_str);
       rtc::strcpyn(guid, kAdmMaxGuidSize, guid_str.c_str());
     } else {
       ret = output_->DeviceName(index, &name_str, nullptr);
     }
     rtc::strcpyn(name, kAdmMaxDeviceNameSize, name_str.c_str());
     return ret;
   }
   int32_t RecordingDeviceName(uint16_t index,
                               char name[kAdmMaxDeviceNameSize],
                               char guid[kAdmMaxGuidSize]) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_INPUT_RESTARTS(0);
     std::string name_str, guid_str;
     int ret = -1;
     if (guid != nullptr) {
       ret = input_->DeviceName(index, &name_str, &guid_str);
       rtc::strcpyn(guid, kAdmMaxGuidSize, guid_str.c_str());
     } else {
       ret = input_->DeviceName(index, &name_str, nullptr);
     }
     rtc::strcpyn(name, kAdmMaxDeviceNameSize, name_str.c_str());
     return ret;
   }

   int32_t SetPlayoutDevice(uint16_t index) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     return output_->SetDevice(index);
   }

   int32_t SetPlayoutDevice(
       AudioDeviceModule::WindowsDeviceType device) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     return output_->SetDevice(device);
   }
   int32_t SetRecordingDevice(uint16_t index) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return input_->SetDevice(index);
   }

   int32_t SetRecordingDevice(
       AudioDeviceModule::WindowsDeviceType device) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return input_->SetDevice(device);
   }

   int32_t PlayoutIsAvailable(bool* available) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     *available = true;
     return 0;
   }

   int32_t InitPlayout() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     RETURN_IF_OUTPUT_IS_INITIALIZED(0);
     return output_->InitPlayout();
   }

   bool PlayoutIsInitialized() const override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(true);
     return output_->PlayoutIsInitialized();
   }

   int32_t RecordingIsAvailable(bool* available) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     *available = true;
     return 0;
   }

   int32_t InitRecording() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_INPUT_RESTARTS(0);
     RETURN_IF_INPUT_IS_INITIALIZED(0);
     return input_->InitRecording();
   }

   bool RecordingIsInitialized() const override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_INPUT_RESTARTS(true);
     return input_->RecordingIsInitialized();
   }

   int32_t StartPlayout() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     RETURN_IF_OUTPUT_IS_ACTIVE(0);
     return output_->StartPlayout();
   }

   int32_t StopPlayout() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(-1);
     return output_->StopPlayout();
   }

   bool Playing() const override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(true);
     return output_->Playing();
   }

   int32_t StartRecording() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_INPUT_RESTARTS(0);
     RETURN_IF_INPUT_IS_ACTIVE(0);
     return input_->StartRecording();
   }

   int32_t StopRecording() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_INPUT_RESTARTS(-1);
     return input_->StopRecording();
   }

   bool Recording() const override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RETURN_IF_INPUT_RESTARTS(true);
     return input_->Recording();
   }

   int32_t InitSpeaker() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RTC_DLOG(LS_WARNING) << "This method has no effect";
     return initialized_ ? 0 : -1;
   }

   bool SpeakerIsInitialized() const override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RTC_DLOG(LS_WARNING) << "This method has no effect";
     return initialized_;
   }

   int32_t InitMicrophone() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RTC_DLOG(LS_WARNING) << "This method has no effect";
     return initialized_ ? 0 : -1;
   }

   bool MicrophoneIsInitialized() const override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RTC_DLOG(LS_WARNING) << "This method has no effect";
     return initialized_;
   }

   int32_t SpeakerVolumeIsAvailable(bool* available) override {
     // TODO(henrika): improve support.
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     *available = false;
     return 0;
   }

   int32_t SetSpeakerVolume(uint32_t volume) override { return 0; }
   int32_t SpeakerVolume(uint32_t* volume) const override { return 0; }
   int32_t MaxSpeakerVolume(uint32_t* maxVolume) const override { return 0; }
   int32_t MinSpeakerVolume(uint32_t* minVolume) const override { return 0; }

   int32_t MicrophoneVolumeIsAvailable(bool* available) override {
     // TODO(henrika): improve support.
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     *available = false;
     return 0;
   }

   int32_t SetMicrophoneVolume(uint32_t volume) override { return 0; }
   int32_t MicrophoneVolume(uint32_t* volume) const override { return 0; }
   int32_t MaxMicrophoneVolume(uint32_t* maxVolume) const override { return 0; }
   int32_t MinMicrophoneVolume(uint32_t* minVolume) const override { return 0; }

   int32_t SpeakerMuteIsAvailable(bool* available) override { return 0; }
   int32_t SetSpeakerMute(bool enable) override { return 0; }
   int32_t SpeakerMute(bool* enabled) const override { return 0; }

   int32_t MicrophoneMuteIsAvailable(bool* available) override { return 0; }
   int32_t SetMicrophoneMute(bool enable) override { return 0; }
   int32_t MicrophoneMute(bool* enabled) const override { return 0; }

   int32_t StereoPlayoutIsAvailable(bool* available) const override {
     // TODO(henrika): improve support.
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     *available = true;
     return 0;
   }

   int32_t SetStereoPlayout(bool enable) override {
     // TODO(henrika): improve support.
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return 0;
   }

   int32_t StereoPlayout(bool* enabled) const override {
     // TODO(henrika): improve support.
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     *enabled = true;
     return 0;
   }

   int32_t StereoRecordingIsAvailable(bool* available) const override {
     // TODO(henrika): improve support.
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     *available = true;
     return 0;
   }

   int32_t SetStereoRecording(bool enable) override {
     // TODO(henrika): improve support.
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return 0;
   }

   int32_t StereoRecording(bool* enabled) const override {
     // TODO(henrika): improve support.
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     *enabled = true;
     return 0;
   }

   int32_t PlayoutDelay(uint16_t* delayMS) const override { return 0; }

   bool BuiltInAECIsAvailable() const override { return false; }
   bool BuiltInAGCIsAvailable() const override { return false; }
   bool BuiltInNSIsAvailable() const override { return false; }

   int32_t EnableBuiltInAEC(bool enable) override { return 0; }
   int32_t EnableBuiltInAGC(bool enable) override { return 0; }
   int32_t EnableBuiltInNS(bool enable) override { return 0; }

   int32_t AttachAudioBuffer() {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     output_->AttachAudioBuffer(audio_device_buffer_.get());
     input_->AttachAudioBuffer(audio_device_buffer_.get());
     return 0;
   }

   int RestartPlayoutInternally() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     RETURN_IF_OUTPUT_RESTARTS(0);
     return output_->RestartPlayout();
   }

   int RestartRecordingInternally() override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return input_->RestartRecording();
   }

   int SetPlayoutSampleRate(uint32_t sample_rate) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return output_->SetSampleRate(sample_rate);
   }

   int SetRecordingSampleRate(uint32_t sample_rate) override {
     RTC_DLOG(LS_INFO) << __FUNCTION__;
     RTC_DCHECK_RUN_ON(&thread_checker_);
     return input_->SetSampleRate(sample_rate);
   }

  private:
   // Ensures that the class is used on the same thread as it is constructed
   // and destroyed on.
   SequenceChecker thread_checker_;

   // Implements the AudioInput interface and deals with audio capturing parts.
   const std::unique_ptr<AudioInput> input_;

   // Implements the AudioOutput interface and deals with audio rendering parts.
   const std::unique_ptr<AudioOutput> output_;

   TaskQueueFactory* const task_queue_factory_;

   // The AudioDeviceBuffer (ADB) instance is needed for sending/receiving audio
   // to/from the WebRTC layer. Created and owned by this object. Used by
   // both `input_` and `output_` but they use orthogonal parts of the ADB.
   std::unique_ptr<AudioDeviceBuffer> audio_device_buffer_;

   // Set to true after a successful call to Init(). Cleared by Terminate().
   bool initialized_ = false;
 };

 }  // namespace

 rtc::scoped_refptr<AudioDeviceModuleForTest>
 CreateWindowsCoreAudioAudioDeviceModuleFromInputAndOutput(
     std::unique_ptr<AudioInput> audio_input,
     std::unique_ptr<AudioOutput> audio_output,
     TaskQueueFactory* task_queue_factory) {
   RTC_DLOG(LS_INFO) << __FUNCTION__;
   return rtc::make_ref_counted<WindowsAudioDeviceModule>(
       std::move(audio_input), std::move(audio_output), task_queue_factory);
 }

 }  // namespace webrtc_win
 }  // namespace webrtc
	/*
	* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include "modules/audio_device/win/audio_device_module_win.h"

	#include <memory>
	#include <utility>

	#include "api/make_ref_counted.h"
	#include "api/sequence_checker.h"
	#include "modules/audio_device/audio_device_buffer.h"
	#include "modules/audio_device/include/audio_device.h"
	#include "rtc_base/checks.h"
	#include "rtc_base/logging.h"
	#include "rtc_base/string_utils.h"

	namespace webrtc {
	namespace webrtc_win {
	namespace {

	#define RETURN_IF_OUTPUT_RESTARTS(...) \
	do { \
	if (output_->Restarting()) { \
	return __VA_ARGS__; \
	} \
	} while (0)

	#define RETURN_IF_INPUT_RESTARTS(...) \
	do { \
	if (input_->Restarting()) { \
	return __VA_ARGS__; \
	} \
	} while (0)

	#define RETURN_IF_OUTPUT_IS_INITIALIZED(...) \
	do { \
	if (output_->PlayoutIsInitialized()) { \
	return __VA_ARGS__; \
	} \
	} while (0)

	#define RETURN_IF_INPUT_IS_INITIALIZED(...) \
	do { \
	if (input_->RecordingIsInitialized()) { \
	return __VA_ARGS__; \
	} \
	} while (0)

	#define RETURN_IF_OUTPUT_IS_ACTIVE(...) \
	do { \
	if (output_->Playing()) { \
	return __VA_ARGS__; \
	} \
	} while (0)

	#define RETURN_IF_INPUT_IS_ACTIVE(...) \
	do { \
	if (input_->Recording()) { \
	return __VA_ARGS__; \
	} \
	} while (0)

	// This class combines a generic instance of an AudioInput and a generic
	// instance of an AudioOutput to create an AudioDeviceModule. This is mostly
	// done by delegating to the audio input/output with some glue code. This class
	// also directly implements some of the AudioDeviceModule methods with dummy
	// implementations.
	//
	// An instance must be created, destroyed and used on one and the same thread,
	// i.e., all public methods must also be called on the same thread. A thread
	// checker will RTC_DCHECK if any method is called on an invalid thread.
	// TODO(henrika): is thread checking needed in AudioInput and AudioOutput?
	class WindowsAudioDeviceModule : public AudioDeviceModuleForTest {
	public:
	enum class InitStatus {
	OK = 0,
	PLAYOUT_ERROR = 1,
	RECORDING_ERROR = 2,
	OTHER_ERROR = 3,
	NUM_STATUSES = 4
	};

	WindowsAudioDeviceModule(std::unique_ptr<AudioInput> audio_input,
	std::unique_ptr<AudioOutput> audio_output,
	TaskQueueFactory* task_queue_factory)
	: input_(std::move(audio_input)),
	output_(std::move(audio_output)),
	task_queue_factory_(task_queue_factory) {
	RTC_CHECK(input_);
	RTC_CHECK(output_);
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	}

	~WindowsAudioDeviceModule() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	Terminate();
	}

	WindowsAudioDeviceModule(const WindowsAudioDeviceModule&) = delete;
	WindowsAudioDeviceModule& operator=(const WindowsAudioDeviceModule&) = delete;

	int32_t ActiveAudioLayer(
	AudioDeviceModule::AudioLayer* audioLayer) const override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	// TODO(henrika): it might be possible to remove this unique signature.
	*audioLayer = AudioDeviceModule::kWindowsCoreAudio2;
	return 0;
	}

	int32_t RegisterAudioCallback(AudioTransport* audioCallback) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK(audio_device_buffer_);
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return audio_device_buffer_->RegisterAudioCallback(audioCallback);
	}

	int32_t Init() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	RETURN_IF_INPUT_RESTARTS(0);
	if (initialized_) {
	return 0;
	}
	audio_device_buffer_ =
	std::make_unique<AudioDeviceBuffer>(task_queue_factory_);
	AttachAudioBuffer();
	InitStatus status;
	if (output_->Init() != 0) {
	status = InitStatus::PLAYOUT_ERROR;
	} else if (input_->Init() != 0) {
	output_->Terminate();
	status = InitStatus::RECORDING_ERROR;
	} else {
	initialized_ = true;
	status = InitStatus::OK;
	}
	if (status != InitStatus::OK) {
	RTC_LOG(LS_ERROR) << "Audio device initialization failed";
	return -1;
	}
	return 0;
	}

	int32_t Terminate() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	RETURN_IF_INPUT_RESTARTS(0);
	if (!initialized_)
	return 0;
	int32_t err = input_->Terminate();
	err \|= output_->Terminate();
	initialized_ = false;
	RTC_DCHECK_EQ(err, 0);
	return err;
	}

	bool Initialized() const override {
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return initialized_;
	}

	int16_t PlayoutDevices() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	return output_->NumDevices();
	}

	int16_t RecordingDevices() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_INPUT_RESTARTS(0);
	return input_->NumDevices();
	}

	int32_t PlayoutDeviceName(uint16_t index,
	char name[kAdmMaxDeviceNameSize],
	char guid[kAdmMaxGuidSize]) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	std::string name_str, guid_str;
	int ret = -1;
	if (guid != nullptr) {
	ret = output_->DeviceName(index, &name_str, &guid_str);
	rtc::strcpyn(guid, kAdmMaxGuidSize, guid_str.c_str());
	} else {
	ret = output_->DeviceName(index, &name_str, nullptr);
	}
	rtc::strcpyn(name, kAdmMaxDeviceNameSize, name_str.c_str());
	return ret;
	}
	int32_t RecordingDeviceName(uint16_t index,
	char name[kAdmMaxDeviceNameSize],
	char guid[kAdmMaxGuidSize]) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_INPUT_RESTARTS(0);
	std::string name_str, guid_str;
	int ret = -1;
	if (guid != nullptr) {
	ret = input_->DeviceName(index, &name_str, &guid_str);
	rtc::strcpyn(guid, kAdmMaxGuidSize, guid_str.c_str());
	} else {
	ret = input_->DeviceName(index, &name_str, nullptr);
	}
	rtc::strcpyn(name, kAdmMaxDeviceNameSize, name_str.c_str());
	return ret;
	}

	int32_t SetPlayoutDevice(uint16_t index) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	return output_->SetDevice(index);
	}

	int32_t SetPlayoutDevice(
	AudioDeviceModule::WindowsDeviceType device) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	return output_->SetDevice(device);
	}
	int32_t SetRecordingDevice(uint16_t index) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return input_->SetDevice(index);
	}

	int32_t SetRecordingDevice(
	AudioDeviceModule::WindowsDeviceType device) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return input_->SetDevice(device);
	}

	int32_t PlayoutIsAvailable(bool* available) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	*available = true;
	return 0;
	}

	int32_t InitPlayout() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	RETURN_IF_OUTPUT_IS_INITIALIZED(0);
	return output_->InitPlayout();
	}

	bool PlayoutIsInitialized() const override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(true);
	return output_->PlayoutIsInitialized();
	}

	int32_t RecordingIsAvailable(bool* available) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	*available = true;
	return 0;
	}

	int32_t InitRecording() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_INPUT_RESTARTS(0);
	RETURN_IF_INPUT_IS_INITIALIZED(0);
	return input_->InitRecording();
	}

	bool RecordingIsInitialized() const override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_INPUT_RESTARTS(true);
	return input_->RecordingIsInitialized();
	}

	int32_t StartPlayout() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	RETURN_IF_OUTPUT_IS_ACTIVE(0);
	return output_->StartPlayout();
	}

	int32_t StopPlayout() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(-1);
	return output_->StopPlayout();
	}

	bool Playing() const override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(true);
	return output_->Playing();
	}

	int32_t StartRecording() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_INPUT_RESTARTS(0);
	RETURN_IF_INPUT_IS_ACTIVE(0);
	return input_->StartRecording();
	}

	int32_t StopRecording() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_INPUT_RESTARTS(-1);
	return input_->StopRecording();
	}

	bool Recording() const override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RETURN_IF_INPUT_RESTARTS(true);
	return input_->Recording();
	}

	int32_t InitSpeaker() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RTC_DLOG(LS_WARNING) << "This method has no effect";
	return initialized_ ? 0 : -1;
	}

	bool SpeakerIsInitialized() const override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RTC_DLOG(LS_WARNING) << "This method has no effect";
	return initialized_;
	}

	int32_t InitMicrophone() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RTC_DLOG(LS_WARNING) << "This method has no effect";
	return initialized_ ? 0 : -1;
	}

	bool MicrophoneIsInitialized() const override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RTC_DLOG(LS_WARNING) << "This method has no effect";
	return initialized_;
	}

	int32_t SpeakerVolumeIsAvailable(bool* available) override {
	// TODO(henrika): improve support.
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	*available = false;
	return 0;
	}

	int32_t SetSpeakerVolume(uint32_t volume) override { return 0; }
	int32_t SpeakerVolume(uint32_t* volume) const override { return 0; }
	int32_t MaxSpeakerVolume(uint32_t* maxVolume) const override { return 0; }
	int32_t MinSpeakerVolume(uint32_t* minVolume) const override { return 0; }

	int32_t MicrophoneVolumeIsAvailable(bool* available) override {
	// TODO(henrika): improve support.
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	*available = false;
	return 0;
	}

	int32_t SetMicrophoneVolume(uint32_t volume) override { return 0; }
	int32_t MicrophoneVolume(uint32_t* volume) const override { return 0; }
	int32_t MaxMicrophoneVolume(uint32_t* maxVolume) const override { return 0; }
	int32_t MinMicrophoneVolume(uint32_t* minVolume) const override { return 0; }

	int32_t SpeakerMuteIsAvailable(bool* available) override { return 0; }
	int32_t SetSpeakerMute(bool enable) override { return 0; }
	int32_t SpeakerMute(bool* enabled) const override { return 0; }

	int32_t MicrophoneMuteIsAvailable(bool* available) override { return 0; }
	int32_t SetMicrophoneMute(bool enable) override { return 0; }
	int32_t MicrophoneMute(bool* enabled) const override { return 0; }

	int32_t StereoPlayoutIsAvailable(bool* available) const override {
	// TODO(henrika): improve support.
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	*available = true;
	return 0;
	}

	int32_t SetStereoPlayout(bool enable) override {
	// TODO(henrika): improve support.
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return 0;
	}

	int32_t StereoPlayout(bool* enabled) const override {
	// TODO(henrika): improve support.
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	*enabled = true;
	return 0;
	}

	int32_t StereoRecordingIsAvailable(bool* available) const override {
	// TODO(henrika): improve support.
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	*available = true;
	return 0;
	}

	int32_t SetStereoRecording(bool enable) override {
	// TODO(henrika): improve support.
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return 0;
	}

	int32_t StereoRecording(bool* enabled) const override {
	// TODO(henrika): improve support.
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	*enabled = true;
	return 0;
	}

	int32_t PlayoutDelay(uint16_t* delayMS) const override { return 0; }

	bool BuiltInAECIsAvailable() const override { return false; }
	bool BuiltInAGCIsAvailable() const override { return false; }
	bool BuiltInNSIsAvailable() const override { return false; }

	int32_t EnableBuiltInAEC(bool enable) override { return 0; }
	int32_t EnableBuiltInAGC(bool enable) override { return 0; }
	int32_t EnableBuiltInNS(bool enable) override { return 0; }

	int32_t AttachAudioBuffer() {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	output_->AttachAudioBuffer(audio_device_buffer_.get());
	input_->AttachAudioBuffer(audio_device_buffer_.get());
	return 0;
	}

	int RestartPlayoutInternally() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	RETURN_IF_OUTPUT_RESTARTS(0);
	return output_->RestartPlayout();
	}

	int RestartRecordingInternally() override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return input_->RestartRecording();
	}

	int SetPlayoutSampleRate(uint32_t sample_rate) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return output_->SetSampleRate(sample_rate);
	}

	int SetRecordingSampleRate(uint32_t sample_rate) override {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	RTC_DCHECK_RUN_ON(&thread_checker_);
	return input_->SetSampleRate(sample_rate);
	}

	private:
	// Ensures that the class is used on the same thread as it is constructed
	// and destroyed on.
	SequenceChecker thread_checker_;

	// Implements the AudioInput interface and deals with audio capturing parts.
	const std::unique_ptr<AudioInput> input_;

	// Implements the AudioOutput interface and deals with audio rendering parts.
	const std::unique_ptr<AudioOutput> output_;

	TaskQueueFactory* const task_queue_factory_;

	// The AudioDeviceBuffer (ADB) instance is needed for sending/receiving audio
	// to/from the WebRTC layer. Created and owned by this object. Used by
	// both `input_` and `output_` but they use orthogonal parts of the ADB.
	std::unique_ptr<AudioDeviceBuffer> audio_device_buffer_;

	// Set to true after a successful call to Init(). Cleared by Terminate().
	bool initialized_ = false;
	};

	} // namespace

	rtc::scoped_refptr<AudioDeviceModuleForTest>
	CreateWindowsCoreAudioAudioDeviceModuleFromInputAndOutput(
	std::unique_ptr<AudioInput> audio_input,
	std::unique_ptr<AudioOutput> audio_output,
	TaskQueueFactory* task_queue_factory) {
	RTC_DLOG(LS_INFO) << __FUNCTION__;
	return rtc::make_ref_counted<WindowsAudioDeviceModule>(
	std::move(audio_input), std::move(audio_output), task_queue_factory);
	}

	} // namespace webrtc_win
	} // namespace webrtc