| /* |
| * Copyright 2016 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 <AVFoundation/AVFoundation.h> |
| #import <Foundation/Foundation.h> |
| |
| #import "WebRTC/RTCMacros.h" |
| |
| NS_ASSUME_NONNULL_BEGIN |
| |
| extern NSString * const kRTCAudioSessionErrorDomain; |
| /** Method that requires lock was called without lock. */ |
| extern NSInteger const kRTCAudioSessionErrorLockRequired; |
| /** Unknown configuration error occurred. */ |
| extern NSInteger const kRTCAudioSessionErrorConfiguration; |
| |
| @class RTCAudioSession; |
| @class RTCAudioSessionConfiguration; |
| |
| // Surfaces AVAudioSession events. WebRTC will listen directly for notifications |
| // from AVAudioSession and handle them before calling these delegate methods, |
| // at which point applications can perform additional processing if required. |
| RTC_EXPORT |
| @protocol RTCAudioSessionDelegate <NSObject> |
| |
| @optional |
| /** Called on a system notification thread when AVAudioSession starts an |
| * interruption event. |
| */ |
| - (void)audioSessionDidBeginInterruption:(RTCAudioSession *)session; |
| |
| /** Called on a system notification thread when AVAudioSession ends an |
| * interruption event. |
| */ |
| - (void)audioSessionDidEndInterruption:(RTCAudioSession *)session |
| shouldResumeSession:(BOOL)shouldResumeSession; |
| |
| /** Called on a system notification thread when AVAudioSession changes the |
| * route. |
| */ |
| - (void)audioSessionDidChangeRoute:(RTCAudioSession *)session |
| reason:(AVAudioSessionRouteChangeReason)reason |
| previousRoute:(AVAudioSessionRouteDescription *)previousRoute; |
| |
| /** Called on a system notification thread when AVAudioSession media server |
| * terminates. |
| */ |
| - (void)audioSessionMediaServerTerminated:(RTCAudioSession *)session; |
| |
| /** Called on a system notification thread when AVAudioSession media server |
| * restarts. |
| */ |
| - (void)audioSessionMediaServerReset:(RTCAudioSession *)session; |
| |
| // TODO(tkchin): Maybe handle SilenceSecondaryAudioHintNotification. |
| |
| - (void)audioSession:(RTCAudioSession *)session |
| didChangeCanPlayOrRecord:(BOOL)canPlayOrRecord; |
| |
| /** Called on a WebRTC thread when the audio device is notified to begin |
| * playback or recording. |
| */ |
| - (void)audioSessionDidStartPlayOrRecord:(RTCAudioSession *)session; |
| |
| /** Called on a WebRTC thread when the audio device is notified to stop |
| * playback or recording. |
| */ |
| - (void)audioSessionDidStopPlayOrRecord:(RTCAudioSession *)session; |
| |
| /** Called when the AVAudioSession output volume value changes. */ |
| - (void)audioSession:(RTCAudioSession *)audioSession |
| didChangeOutputVolume:(float)outputVolume; |
| |
| /** Called when the audio device detects a playout glitch. The argument is the |
| * number of glitches detected so far in the current audio playout session. |
| */ |
| - (void)audioSession:(RTCAudioSession *)audioSession |
| didDetectPlayoutGlitch:(int64_t)totalNumberOfGlitches; |
| |
| @end |
| |
| /** This is a protocol used to inform RTCAudioSession when the audio session |
| * activation state has changed outside of RTCAudioSession. The current known use |
| * case of this is when CallKit activates the audio session for the application |
| */ |
| RTC_EXPORT |
| @protocol RTCAudioSessionActivationDelegate <NSObject> |
| |
| /** Called when the audio session is activated outside of the app by iOS. */ |
| - (void)audioSessionDidActivate:(AVAudioSession *)session; |
| |
| /** Called when the audio session is deactivated outside of the app by iOS. */ |
| - (void)audioSessionDidDeactivate:(AVAudioSession *)session; |
| |
| @end |
| |
| /** Proxy class for AVAudioSession that adds a locking mechanism similar to |
| * AVCaptureDevice. This is used to that interleaving configurations between |
| * WebRTC and the application layer are avoided. |
| * |
| * RTCAudioSession also coordinates activation so that the audio session is |
| * activated only once. See |setActive:error:|. |
| */ |
| RTC_EXPORT |
| @interface RTCAudioSession : NSObject <RTCAudioSessionActivationDelegate> |
| |
| /** Convenience property to access the AVAudioSession singleton. Callers should |
| * not call setters on AVAudioSession directly, but other method invocations |
| * are fine. |
| */ |
| @property(nonatomic, readonly) AVAudioSession *session; |
| |
| /** Our best guess at whether the session is active based on results of calls to |
| * AVAudioSession. |
| */ |
| @property(nonatomic, readonly) BOOL isActive; |
| /** Whether RTCAudioSession is currently locked for configuration. */ |
| @property(nonatomic, readonly) BOOL isLocked; |
| |
| /** If YES, WebRTC will not initialize the audio unit automatically when an |
| * audio track is ready for playout or recording. Instead, applications should |
| * call setIsAudioEnabled. If NO, WebRTC will initialize the audio unit |
| * as soon as an audio track is ready for playout or recording. |
| */ |
| @property(nonatomic, assign) BOOL useManualAudio; |
| |
| /** This property is only effective if useManualAudio is YES. |
| * Represents permission for WebRTC to initialize the VoIP audio unit. |
| * When set to NO, if the VoIP audio unit used by WebRTC is active, it will be |
| * stopped and uninitialized. This will stop incoming and outgoing audio. |
| * When set to YES, WebRTC will initialize and start the audio unit when it is |
| * needed (e.g. due to establishing an audio connection). |
| * This property was introduced to work around an issue where if an AVPlayer is |
| * playing audio while the VoIP audio unit is initialized, its audio would be |
| * either cut off completely or played at a reduced volume. By preventing |
| * the audio unit from being initialized until after the audio has completed, |
| * we are able to prevent the abrupt cutoff. |
| */ |
| @property(nonatomic, assign) BOOL isAudioEnabled; |
| |
| // Proxy properties. |
| @property(readonly) NSString *category; |
| @property(readonly) AVAudioSessionCategoryOptions categoryOptions; |
| @property(readonly) NSString *mode; |
| @property(readonly) BOOL secondaryAudioShouldBeSilencedHint; |
| @property(readonly) AVAudioSessionRouteDescription *currentRoute; |
| @property(readonly) NSInteger maximumInputNumberOfChannels; |
| @property(readonly) NSInteger maximumOutputNumberOfChannels; |
| @property(readonly) float inputGain; |
| @property(readonly) BOOL inputGainSettable; |
| @property(readonly) BOOL inputAvailable; |
| @property(readonly, nullable) |
| NSArray<AVAudioSessionDataSourceDescription *> * inputDataSources; |
| @property(readonly, nullable) |
| AVAudioSessionDataSourceDescription *inputDataSource; |
| @property(readonly, nullable) |
| NSArray<AVAudioSessionDataSourceDescription *> * outputDataSources; |
| @property(readonly, nullable) |
| AVAudioSessionDataSourceDescription *outputDataSource; |
| @property(readonly) double sampleRate; |
| @property(readonly) double preferredSampleRate; |
| @property(readonly) NSInteger inputNumberOfChannels; |
| @property(readonly) NSInteger outputNumberOfChannels; |
| @property(readonly) float outputVolume; |
| @property(readonly) NSTimeInterval inputLatency; |
| @property(readonly) NSTimeInterval outputLatency; |
| @property(readonly) NSTimeInterval IOBufferDuration; |
| @property(readonly) NSTimeInterval preferredIOBufferDuration; |
| |
| /** Default constructor. */ |
| + (instancetype)sharedInstance; |
| - (instancetype)init NS_UNAVAILABLE; |
| |
| /** Adds a delegate, which is held weakly. */ |
| - (void)addDelegate:(id<RTCAudioSessionDelegate>)delegate; |
| /** Removes an added delegate. */ |
| - (void)removeDelegate:(id<RTCAudioSessionDelegate>)delegate; |
| |
| /** Request exclusive access to the audio session for configuration. This call |
| * will block if the lock is held by another object. |
| */ |
| - (void)lockForConfiguration; |
| /** Relinquishes exclusive access to the audio session. */ |
| - (void)unlockForConfiguration; |
| |
| /** If |active|, activates the audio session if it isn't already active. |
| * Successful calls must be balanced with a setActive:NO when activation is no |
| * longer required. If not |active|, deactivates the audio session if one is |
| * active and this is the last balanced call. When deactivating, the |
| * AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation option is passed to |
| * AVAudioSession. |
| */ |
| - (BOOL)setActive:(BOOL)active |
| error:(NSError **)outError; |
| |
| // The following methods are proxies for the associated methods on |
| // AVAudioSession. |lockForConfiguration| must be called before using them |
| // otherwise they will fail with kRTCAudioSessionErrorLockRequired. |
| |
| - (BOOL)setCategory:(NSString *)category |
| withOptions:(AVAudioSessionCategoryOptions)options |
| error:(NSError **)outError; |
| - (BOOL)setMode:(NSString *)mode error:(NSError **)outError; |
| - (BOOL)setInputGain:(float)gain error:(NSError **)outError; |
| - (BOOL)setPreferredSampleRate:(double)sampleRate error:(NSError **)outError; |
| - (BOOL)setPreferredIOBufferDuration:(NSTimeInterval)duration |
| error:(NSError **)outError; |
| - (BOOL)setPreferredInputNumberOfChannels:(NSInteger)count |
| error:(NSError **)outError; |
| - (BOOL)setPreferredOutputNumberOfChannels:(NSInteger)count |
| error:(NSError **)outError; |
| - (BOOL)overrideOutputAudioPort:(AVAudioSessionPortOverride)portOverride |
| error:(NSError **)outError; |
| - (BOOL)setPreferredInput:(AVAudioSessionPortDescription *)inPort |
| error:(NSError **)outError; |
| - (BOOL)setInputDataSource:(AVAudioSessionDataSourceDescription *)dataSource |
| error:(NSError **)outError; |
| - (BOOL)setOutputDataSource:(AVAudioSessionDataSourceDescription *)dataSource |
| error:(NSError **)outError; |
| @end |
| |
| @interface RTCAudioSession (Configuration) |
| |
| /** Applies the configuration to the current session. Attempts to set all |
| * properties even if previous ones fail. Only the last error will be |
| * returned. |
| * |lockForConfiguration| must be called first. |
| */ |
| - (BOOL)setConfiguration:(RTCAudioSessionConfiguration *)configuration |
| error:(NSError **)outError; |
| |
| /** Convenience method that calls both setConfiguration and setActive. |
| * |lockForConfiguration| must be called first. |
| */ |
| - (BOOL)setConfiguration:(RTCAudioSessionConfiguration *)configuration |
| active:(BOOL)active |
| error:(NSError **)outError; |
| |
| @end |
| |
| NS_ASSUME_NONNULL_END |
