ObjC ADM: added RTCAudioDevice protocol [2/N]
Bug: webrtc:14193
Change-Id: I616c4d338a0bbc57c22e1f1dcc4454512aecd967
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/268195
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Peter Hanspers <peterhanspers@webrtc.org>
Commit-Queue: Yury Yarashevich <yura.yaroshevich@gmail.com>
Cr-Commit-Position: refs/heads/main@{#37925}
diff --git a/sdk/BUILD.gn b/sdk/BUILD.gn
index dc9bd64..03e5013 100644
--- a/sdk/BUILD.gn
+++ b/sdk/BUILD.gn
@@ -392,6 +392,18 @@
}
}
+ rtc_source_set("audio_device_api_objc") {
+ visibility = [ "*" ]
+
+ sources = [ "objc/components/audio/RTCAudioDevice.h" ]
+
+ public_configs = [ ":common_config_objc" ]
+
+ frameworks = [ "AudioToolbox.framework" ]
+
+ deps = [ ":base_objc" ]
+ }
+
rtc_library("audio_device_objc") {
visibility = [ "*" ]
@@ -401,6 +413,24 @@
]
deps = [
+ ":audio_device_api_objc",
+ "../modules/audio_device:audio_device_api",
+ "../rtc_base:logging",
+ ]
+ }
+
+ rtc_library("objc_audio_device_module") {
+ visibility = [ "*" ]
+
+ sources = [
+ "objc/native/api/objc_audio_device_module.h",
+ "objc/native/api/objc_audio_device_module.mm",
+ ]
+
+ deps = [
+ ":audio_device_api_objc",
+ ":audio_device_objc",
+ "../api:make_ref_counted",
"../modules/audio_device:audio_device_api",
"../rtc_base:logging",
]
@@ -1001,6 +1031,7 @@
public_configs = [ ":common_config_objc" ]
deps = [
+ ":audio_device_api_objc",
":base_native_additions_objc",
":base_objc",
":file_logger_objc",
@@ -1009,6 +1040,7 @@
":mediasource_objc",
":native_api",
":native_video",
+ ":objc_audio_device_module",
":videoframebuffer_objc",
":videorendereradapter_objc",
":videosource_objc",
@@ -1236,6 +1268,7 @@
"objc/base/RTCVideoFrameBuffer.h",
"objc/base/RTCVideoRenderer.h",
"objc/base/RTCYUVPlanarBuffer.h",
+ "objc/components/audio/RTCAudioDevice.h",
"objc/components/audio/RTCAudioSession.h",
"objc/components/audio/RTCAudioSessionConfiguration.h",
"objc/components/capturer/RTCCameraVideoCapturer.h",
diff --git a/sdk/objc/api/peerconnection/RTCPeerConnectionFactory.h b/sdk/objc/api/peerconnection/RTCPeerConnectionFactory.h
index 88aac99..5575af9 100644
--- a/sdk/objc/api/peerconnection/RTCPeerConnectionFactory.h
+++ b/sdk/objc/api/peerconnection/RTCPeerConnectionFactory.h
@@ -31,18 +31,26 @@
(RTCVideoEncoderFactory);
@protocol RTC_OBJC_TYPE
(RTCSSLCertificateVerifier);
+@protocol RTC_OBJC_TYPE
+(RTCAudioDevice);
RTC_OBJC_EXPORT
@interface RTC_OBJC_TYPE (RTCPeerConnectionFactory) : NSObject
-/* Initialize object with default H264 video encoder/decoder factories */
+/* Initialize object with default H264 video encoder/decoder factories and default ADM */
- (instancetype)init;
-/* Initialize object with injectable video encoder/decoder factories */
+/* Initialize object with injectable video encoder/decoder factories and default ADM */
- (instancetype)
initWithEncoderFactory:(nullable id<RTC_OBJC_TYPE(RTCVideoEncoderFactory)>)encoderFactory
decoderFactory:(nullable id<RTC_OBJC_TYPE(RTCVideoDecoderFactory)>)decoderFactory;
+/* Initialize object with injectable video encoder/decoder factories and injectable ADM */
+- (instancetype)
+ initWithEncoderFactory:(nullable id<RTC_OBJC_TYPE(RTCVideoEncoderFactory)>)encoderFactory
+ decoderFactory:(nullable id<RTC_OBJC_TYPE(RTCVideoDecoderFactory)>)decoderFactory
+ audioDevice:(nullable id<RTC_OBJC_TYPE(RTCAudioDevice)>)audioDevice;
+
/** Initialize an RTCAudioSource with constraints. */
- (RTC_OBJC_TYPE(RTCAudioSource) *)audioSourceWithConstraints:
(nullable RTC_OBJC_TYPE(RTCMediaConstraints) *)constraints;
diff --git a/sdk/objc/api/peerconnection/RTCPeerConnectionFactory.mm b/sdk/objc/api/peerconnection/RTCPeerConnectionFactory.mm
index e2215c8..c4d89e9 100644
--- a/sdk/objc/api/peerconnection/RTCPeerConnectionFactory.mm
+++ b/sdk/objc/api/peerconnection/RTCPeerConnectionFactory.mm
@@ -41,6 +41,7 @@
#include "modules/audio_device/include/audio_device.h"
#include "modules/audio_processing/include/audio_processing.h"
+#include "sdk/objc/native/api/objc_audio_device_module.h"
#include "sdk/objc/native/api/video_decoder_factory.h"
#include "sdk/objc/native/api/video_encoder_factory.h"
#include "sdk/objc/native/src/objc_video_decoder_factory.h"
@@ -82,6 +83,16 @@
- (instancetype)
initWithEncoderFactory:(nullable id<RTC_OBJC_TYPE(RTCVideoEncoderFactory)>)encoderFactory
decoderFactory:(nullable id<RTC_OBJC_TYPE(RTCVideoDecoderFactory)>)decoderFactory {
+ return [self initWithEncoderFactory:encoderFactory decoderFactory:decoderFactory audioDevice:nil];
+}
+
+- (instancetype)
+ initWithEncoderFactory:(nullable id<RTC_OBJC_TYPE(RTCVideoEncoderFactory)>)encoderFactory
+ decoderFactory:(nullable id<RTC_OBJC_TYPE(RTCVideoDecoderFactory)>)decoderFactory
+ audioDevice:(nullable id<RTC_OBJC_TYPE(RTCAudioDevice)>)audioDevice {
+#ifdef HAVE_NO_MEDIA
+ return [self initWithNoMedia];
+#else
std::unique_ptr<webrtc::VideoEncoderFactory> native_encoder_factory;
std::unique_ptr<webrtc::VideoDecoderFactory> native_decoder_factory;
if (encoderFactory) {
@@ -90,13 +101,21 @@
if (decoderFactory) {
native_decoder_factory = webrtc::ObjCToNativeVideoDecoderFactory(decoderFactory);
}
+ rtc::scoped_refptr<webrtc::AudioDeviceModule> audio_device_module;
+ if (audioDevice) {
+ audio_device_module = webrtc::CreateAudioDeviceModule(audioDevice);
+ } else {
+ audio_device_module = [self audioDeviceModule];
+ }
return [self initWithNativeAudioEncoderFactory:webrtc::CreateBuiltinAudioEncoderFactory()
nativeAudioDecoderFactory:webrtc::CreateBuiltinAudioDecoderFactory()
nativeVideoEncoderFactory:std::move(native_encoder_factory)
nativeVideoDecoderFactory:std::move(native_decoder_factory)
- audioDeviceModule:[self audioDeviceModule].get()
+ audioDeviceModule:audio_device_module.get()
audioProcessingModule:nullptr];
+#endif
}
+
- (instancetype)initNative {
if (self = [super init]) {
_networkThread = rtc::Thread::CreateWithSocketServer();
diff --git a/sdk/objc/components/audio/RTCAudioDevice.h b/sdk/objc/components/audio/RTCAudioDevice.h
new file mode 100644
index 0000000..7f4509e
--- /dev/null
+++ b/sdk/objc/components/audio/RTCAudioDevice.h
@@ -0,0 +1,308 @@
+/*
+ * Copyright 2022 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.
+ */
+
+#import <AudioUnit/AudioUnit.h>
+#import <Foundation/Foundation.h>
+
+#import "RTCMacros.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+typedef OSStatus (^RTC_OBJC_TYPE(RTCAudioDeviceGetPlayoutDataBlock))(
+ AudioUnitRenderActionFlags *_Nonnull actionFlags,
+ const AudioTimeStamp *_Nonnull timestamp,
+ NSInteger inputBusNumber,
+ UInt32 frameCount,
+ AudioBufferList *_Nonnull outputData);
+
+typedef OSStatus (^RTC_OBJC_TYPE(RTCAudioDeviceRenderRecordedDataBlock))(
+ AudioUnitRenderActionFlags *_Nonnull actionFlags,
+ const AudioTimeStamp *_Nonnull timestamp,
+ NSInteger inputBusNumber,
+ UInt32 frameCount,
+ AudioBufferList *_Nonnull inputData,
+ void *_Nullable renderContext);
+
+typedef OSStatus (^RTC_OBJC_TYPE(RTCAudioDeviceDeliverRecordedDataBlock))(
+ AudioUnitRenderActionFlags *_Nonnull actionFlags,
+ const AudioTimeStamp *_Nonnull timestamp,
+ NSInteger inputBusNumber,
+ UInt32 frameCount,
+ const AudioBufferList *_Nullable inputData,
+ void *_Nullable renderContext,
+ NS_NOESCAPE RTC_OBJC_TYPE(RTCAudioDeviceRenderRecordedDataBlock) _Nullable renderBlock);
+
+/**
+ * Delegate object provided by native ADM during RTCAudioDevice initialization.
+ * Provides blocks to poll playback audio samples from native ADM and to feed
+ * recorded audio samples into native ADM.
+ */
+RTC_OBJC_EXPORT @protocol RTC_OBJC_TYPE
+(RTCAudioDeviceDelegate)<NSObject>
+ /**
+ * Implementation of RTCAudioSource should call this block to feed recorded PCM (16-bit integer)
+ * into native ADM. Stereo data is expected to be interleaved starting with the left channel.
+ * Either `inputData` with pre-filled audio data must be provided during block
+ * call or `renderBlock` must be provided which must fill provided audio buffer with recorded
+ * samples.
+ *
+ * NOTE: Implementation of RTCAudioDevice is expected to call the block on the same thread until
+ * `notifyAudioInterrupted` is called. When `notifyAudioInterrupted` is called implementation
+ * can call the block on a different thread.
+ */
+ @property(readonly, nonnull)
+ RTC_OBJC_TYPE(RTCAudioDeviceDeliverRecordedDataBlock) deliverRecordedData;
+
+/**
+ * Provides input sample rate preference as it preferred by native ADM.
+ */
+@property(readonly) double preferredInputSampleRate;
+
+/**
+ * Provides input IO buffer duration preference as it preferred by native ADM.
+ */
+@property(readonly) NSTimeInterval preferredInputIOBufferDuration;
+
+/**
+ * Provides output sample rate preference as it preferred by native ADM.
+ */
+@property(readonly) double preferredOutputSampleRate;
+
+/**
+ * Provides output IO buffer duration preference as it preferred by native ADM.
+ */
+@property(readonly) NSTimeInterval preferredOutputIOBufferDuration;
+
+/**
+ * Implementation of RTCAudioDevice should call this block to request PCM (16-bit integer)
+ * from native ADM to play. Stereo data is interleaved starting with the left channel.
+ *
+ * NOTE: Implementation of RTCAudioDevice is expected to invoke of this block on the
+ * same thread until `notifyAudioInterrupted` is called. When `notifyAudioInterrupted` is called
+ * implementation can call the block from a different thread.
+ */
+@property(readonly, nonnull) RTC_OBJC_TYPE(RTCAudioDeviceGetPlayoutDataBlock) getPlayoutData;
+
+/**
+ * Notifies native ADM that some of the audio input parameters of RTCAudioDevice like
+ * samle rate and/or IO buffer duration and/or IO latency had possibly changed.
+ * Native ADM will adjust its audio input buffer to match current parameters of audio device.
+ *
+ * NOTE: Must be called within block executed via `dispatchAsync` or `dispatchSync`.
+ */
+- (void)notifyAudioInputParametersChange;
+
+/**
+ * Notifies native ADM that some of the audio output parameters of RTCAudioDevice like
+ * samle rate and/or IO buffer duration and/or IO latency had possibly changed.
+ * Native ADM will adjust its audio output buffer to match current parameters of audio device.
+ *
+ * NOTE: Must be called within block executed via `dispatchAsync` or `dispatchSync`.
+ */
+- (void)notifyAudioOutputParametersChange;
+
+/**
+ * Notifies native ADM that audio input is interrupted and further audio playout
+ * and recording might happen on a different thread.
+ *
+ * NOTE: Must be called within block executed via `dispatchAsync` or `dispatchSync`.
+ */
+- (void)notifyAudioInputInterrupted;
+
+/**
+ * Notifies native ADM that audio output is interrupted and further audio playout
+ * and recording might happen on a different thread.
+ *
+ * NOTE: Must be called within block executed via `dispatchAsync` or `dispatchSync`.
+ */
+- (void)notifyAudioOutputInterrupted;
+
+/**
+ * Asynchronously execute block of code within the context of
+ * thread which owns native ADM.
+ *
+ * NOTE: Intended to be used to invoke `notifyAudioInputParametersChange`,
+ * `notifyAudioOutputParametersChange`, `notifyAudioInputInterrupted`,
+ * `notifyAudioOutputInterrupted` on native ADM thread.
+ * Also could be used by `RTCAudioDevice` implementation to tie
+ * mutations of underlying audio objects (AVAudioEngine, AudioUnit, etc)
+ * to the native ADM thread. Could be useful to handle events like audio route change, which
+ * could lead to audio parameters change.
+ */
+- (void)dispatchAsync:(dispatch_block_t)block;
+
+/**
+ * Synchronously execute block of code within the context of
+ * thread which owns native ADM. Allows reentrancy.
+ *
+ * NOTE: Intended to be used to invoke `notifyAudioInputParametersChange`,
+ * `notifyAudioOutputParametersChange`, `notifyAudioInputInterrupted`,
+ * `notifyAudioOutputInterrupted` on native ADM thread and make sure
+ * aforementioned is completed before `dispatchSync` returns. Could be useful
+ * when implementation of `RTCAudioDevice` tie mutation to underlying audio objects (AVAudioEngine,
+ * AudioUnit, etc) to own thread to satisfy requirement that native ADM audio parameters
+ * must be kept in sync with current audio parameters before audio is actually played or recorded.
+ */
+- (void)dispatchSync:(dispatch_block_t)block;
+
+@end
+
+/**
+ * Protocol to abstract platform specific ways to implement playback and recording.
+ *
+ * NOTE: All the members of protocol are called by native ADM from the same thread
+ * between calls to `initializeWithDelegate` and `terminate`.
+ * NOTE: Implementation is fully responsible for configuring application's AVAudioSession.
+ * An example implementation of RTCAudioDevice: https://github.com/mstyura/RTCAudioDevice
+ * TODO(yura.yaroshevich): Implement custom RTCAudioDevice for AppRTCMobile demo app.
+ */
+RTC_OBJC_EXPORT @protocol RTC_OBJC_TYPE
+(RTCAudioDevice)<NSObject>
+
+ /**
+ * Indicates current sample rate of audio recording. Changes to this property
+ * must be notified back to native ADM via `-[RTCAudioDeviceDelegate
+ * notifyAudioParametersChange]`.
+ */
+ @property(readonly) double inputSampleRate;
+
+/**
+ * Indicates current size of record buffer. Changes to this property
+ * must be notified back to native ADM via `-[RTCAudioDeviceDelegate notifyAudioParametersChange]`.
+ */
+@property(readonly) NSTimeInterval inputIOBufferDuration;
+
+/**
+ * Indicates current number of recorded audio channels. Changes to this property
+ * must be notified back to native ADM via `-[RTCAudioDeviceDelegate notifyAudioParametersChange]`.
+ */
+@property(readonly) NSInteger inputNumberOfChannels;
+
+/**
+ * Indicates current input latency
+ */
+@property(readonly) NSTimeInterval inputLatency;
+
+/**
+ * Indicates current sample rate of audio playback. Changes to this property
+ * must be notified back to native ADM via `-[RTCAudioDeviceDelegate notifyAudioParametersChange]`.
+ */
+@property(readonly) double outputSampleRate;
+
+/**
+ * Indicates current size of playback buffer. Changes to this property
+ * must be notified back to native ADM via `-[RTCAudioDeviceDelegate notifyAudioParametersChange]`.
+ */
+@property(readonly) NSTimeInterval outputIOBufferDuration;
+
+/**
+ * Indicates current number of playback audio channels. Changes to this property
+ * must be notified back to WebRTC via `[RTCAudioDeviceDelegate notifyAudioParametersChange]`.
+ */
+@property(readonly) NSInteger outputNumberOfChannels;
+
+/**
+ * Indicates current output latency
+ */
+@property(readonly) NSTimeInterval outputLatency;
+
+/**
+ * Indicates if invocation of `initializeWithDelegate` required before usage of RTCAudioDevice.
+ * YES indicates that `initializeWithDelegate` was called earlier without subsequent call to
+ * `terminate`. NO indicates that either `initializeWithDelegate` not called or `terminate` called.
+ */
+@property(readonly) BOOL isInitialized;
+
+/**
+ * Initializes RTCAudioDevice with RTCAudioDeviceDelegate.
+ * Implementation must return YES if RTCAudioDevice initialized successfully and NO otherwise.
+ */
+- (BOOL)initializeWithDelegate:(id<RTC_OBJC_TYPE(RTCAudioDeviceDelegate)>)delegate;
+
+/**
+ * De-initializes RTCAudioDevice. Implementation should forget about `delegate` provided in
+ * `initializeWithDelegate`.
+ */
+- (BOOL)terminate;
+
+/**
+ * Property to indicate if `initializePlayout` call required before invocation of `startPlayout`.
+ * YES indicates that `initializePlayout` was successfully invoked earlier or not necessary,
+ * NO indicates that `initializePlayout` invocation required.
+ */
+@property(readonly) BOOL isPlayoutInitialized;
+
+/**
+ * Prepares RTCAudioDevice to play audio.
+ * Called by native ADM before invocation of `startPlayout`.
+ * Implementation is expected to return YES in case of successful playout initialization and NO
+ * otherwise.
+ */
+- (BOOL)initializePlayout;
+
+/**
+ * Property to indicate if RTCAudioDevice should be playing according to
+ * earlier calls of `startPlayout` and `stopPlayout`.
+ */
+@property(readonly) BOOL isPlaying;
+
+/**
+ * Method is called when native ADM wants to play audio.
+ * Implementation is expected to return YES if playback start request
+ * successfully handled and NO otherwise.
+ */
+- (BOOL)startPlayout;
+
+/**
+ * Method is called when native ADM no longer needs to play audio.
+ * Implementation is expected to return YES if playback stop request
+ * successfully handled and NO otherwise.
+ */
+- (BOOL)stopPlayout;
+
+/**
+ * Property to indicate if `initializeRecording` call required before usage of `startRecording`.
+ * YES indicates that `initializeRecording` was successfully invoked earlier or not necessary,
+ * NO indicates that `initializeRecording` invocation required.
+ */
+@property(readonly) BOOL isRecordingInitialized;
+
+/**
+ * Prepares RTCAudioDevice to record audio.
+ * Called by native ADM before invocation of `startRecording`.
+ * Implementation may use this method to prepare resources required to record audio.
+ * Implementation is expected to return YES in case of successful record initialization and NO
+ * otherwise.
+ */
+- (BOOL)initializeRecording;
+
+/**
+ * Property to indicate if RTCAudioDevice should record audio according to
+ * earlier calls to `startRecording` and `stopRecording`.
+ */
+@property(readonly) BOOL isRecording;
+
+/**
+ * Method is called when native ADM wants to record audio.
+ * Implementation is expected to return YES if recording start request
+ * successfully handled and NO otherwise.
+ */
+- (BOOL)startRecording;
+
+/**
+ * Method is called when native ADM no longer needs to record audio.
+ * Implementation is expected to return YES if recording stop request
+ * successfully handled and NO otherwise.
+ */
+- (BOOL)stopRecording;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/sdk/objc/native/api/objc_audio_device_module.h b/sdk/objc/native/api/objc_audio_device_module.h
new file mode 100644
index 0000000..0fe2dda
--- /dev/null
+++ b/sdk/objc/native/api/objc_audio_device_module.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2022 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.
+ */
+
+#ifndef SDK_OBJC_NATIVE_API_OBJC_AUDIO_DEVICE_MODULE_H_
+#define SDK_OBJC_NATIVE_API_OBJC_AUDIO_DEVICE_MODULE_H_
+
+#import "components/audio/RTCAudioDevice.h"
+#include "modules/audio_device/include/audio_device.h"
+
+namespace webrtc {
+
+rtc::scoped_refptr<AudioDeviceModule> CreateAudioDeviceModule(
+ id<RTC_OBJC_TYPE(RTCAudioDevice)> audio_device);
+
+} // namespace webrtc
+
+#endif // SDK_OBJC_NATIVE_API_OBJC_AUDIO_DEVICE_MODULE_H_
diff --git a/sdk/objc/native/api/objc_audio_device_module.mm b/sdk/objc/native/api/objc_audio_device_module.mm
new file mode 100644
index 0000000..76edd45
--- /dev/null
+++ b/sdk/objc/native/api/objc_audio_device_module.mm
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2022 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 "objc_audio_device_module.h"
+
+#include "api/make_ref_counted.h"
+#include "rtc_base/logging.h"
+
+#include "sdk/objc/native/src/objc_audio_device.h"
+
+namespace webrtc {
+
+rtc::scoped_refptr<AudioDeviceModule> CreateAudioDeviceModule(
+ id<RTC_OBJC_TYPE(RTCAudioDevice)> audio_device) {
+ RTC_DLOG(LS_INFO) << __FUNCTION__;
+ return rtc::make_ref_counted<objc_adm::ObjCAudioDeviceModule>(audio_device);
+}
+
+} // namespace webrtc
diff --git a/sdk/objc/native/src/objc_audio_device.h b/sdk/objc/native/src/objc_audio_device.h
index 8862889..7700855 100644
--- a/sdk/objc/native/src/objc_audio_device.h
+++ b/sdk/objc/native/src/objc_audio_device.h
@@ -11,6 +11,7 @@
#ifndef SDK_OBJC_NATIVE_SRC_OBJC_AUDIO_DEVICE_H_
#define SDK_OBJC_NATIVE_SRC_OBJC_AUDIO_DEVICE_H_
+#import "components/audio/RTCAudioDevice.h"
#include "modules/audio_device/include/audio_device.h"
namespace webrtc {
@@ -19,7 +20,8 @@
class ObjCAudioDeviceModule : public AudioDeviceModule {
public:
- ObjCAudioDeviceModule();
+ explicit ObjCAudioDeviceModule(
+ id<RTC_OBJC_TYPE(RTCAudioDevice)> audio_device);
~ObjCAudioDeviceModule() override;
// Retrieve the currently utilized audio layer
@@ -123,6 +125,9 @@
int GetPlayoutAudioParameters(AudioParameters* params) const override;
int GetRecordAudioParameters(AudioParameters* params) const override;
#endif // WEBRTC_IOS
+
+ private:
+ id<RTC_OBJC_TYPE(RTCAudioDevice)> audio_device_;
};
} // namespace objc_adm
diff --git a/sdk/objc/native/src/objc_audio_device.mm b/sdk/objc/native/src/objc_audio_device.mm
index b252031..1f8a5f8 100644
--- a/sdk/objc/native/src/objc_audio_device.mm
+++ b/sdk/objc/native/src/objc_audio_device.mm
@@ -15,8 +15,10 @@
namespace webrtc {
namespace objc_adm {
-ObjCAudioDeviceModule::ObjCAudioDeviceModule() {
+ObjCAudioDeviceModule::ObjCAudioDeviceModule(id<RTC_OBJC_TYPE(RTCAudioDevice)> audio_device)
+ : audio_device_(audio_device) {
RTC_DLOG_F(LS_VERBOSE) << "";
+ RTC_DCHECK(audio_device_);
}
ObjCAudioDeviceModule::~ObjCAudioDeviceModule() {
