webrtc/modules/audio_device/ios/objc/RTCAudioSessionDelegateAdapter.mm

/*
 *  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 "webrtc/modules/audio_device/ios/objc/RTCAudioSessionDelegateAdapter.h"

#include "webrtc/modules/audio_device/ios/audio_session_observer.h"

#import "WebRTC/RTCLogging.h"

@implementation RTCAudioSessionDelegateAdapter {
  webrtc::AudioSessionObserver *_observer;
}

- (instancetype)initWithObserver:(webrtc::AudioSessionObserver *)observer {
  NSParameterAssert(observer);
  if (self = [super init]) {
    _observer = observer;
  }
  return self;
}

#pragma mark - RTCAudioSessionDelegate

- (void)audioSessionDidBeginInterruption:(RTCAudioSession *)session {
  _observer->OnInterruptionBegin();
}

- (void)audioSessionDidEndInterruption:(RTCAudioSession *)session
                   shouldResumeSession:(BOOL)shouldResumeSession {
  _observer->OnInterruptionEnd();
}

- (void)audioSessionDidChangeRoute:(RTCAudioSession *)session
           reason:(AVAudioSessionRouteChangeReason)reason
    previousRoute:(AVAudioSessionRouteDescription *)previousRoute {
  switch (reason) {
    case AVAudioSessionRouteChangeReasonUnknown:
    case AVAudioSessionRouteChangeReasonNewDeviceAvailable:
    case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:
    case AVAudioSessionRouteChangeReasonCategoryChange:
      // It turns out that we see a category change (at least in iOS 9.2)
      // when making a switch from a BT device to e.g. Speaker using the
      // iOS Control Center and that we therefore must check if the sample
      // rate has changed. And if so is the case, restart the audio unit.
    case AVAudioSessionRouteChangeReasonOverride:
    case AVAudioSessionRouteChangeReasonWakeFromSleep:
    case AVAudioSessionRouteChangeReasonNoSuitableRouteForCategory:
      _observer->OnValidRouteChange();
      break;
    case AVAudioSessionRouteChangeReasonRouteConfigurationChange:
      // The set of input and output ports has not changed, but their
      // configuration has, e.g., a port’s selected data source has
      // changed. Ignore this type of route change since we are focusing
      // on detecting headset changes.
      RTCLog(@"Ignoring RouteConfigurationChange");
      break;
  }
}

- (void)audioSessionMediaServicesWereLost:(RTCAudioSession *)session {
}

- (void)audioSessionMediaServicesWereReset:(RTCAudioSession *)session {
}

- (void)audioSessionShouldConfigure:(RTCAudioSession *)session {
}

- (void)audioSessionShouldUnconfigure:(RTCAudioSession *)session {
}

- (void)audioSessionDidConfigure:(RTCAudioSession *)session {
  _observer->OnConfiguredForWebRTC();
}

@end