1: 経路変更コールは 2 回でも発生する可能性があります。たとえば、ヘッドホンを接続した場合 (同じルート変更の理由コード)。
2: オーディオ セッションをアクティブに設定すると、RouteChange が呼び出されます。つまり、少なくとも一度は。
音声セッションをアクティブ化/非アクティブ化する独自の音声割り込みを実装している可能性がありますか?
これが私のルート変更リスナーです(私はplayAndRecordカテゴリを使用しています)[iOS7に更新]:
#pragma mark Route change listener
// *********************************************************************************************************
// *********** Route change listener ***********************************************************************
// *********************************************************************************************************
-(void)routeChanged:(NSNotification*)notification {
NSLog(@"]-----------------[ Audio Route Change ]--------------------[");
AVAudioSession *session = [AVAudioSession sharedInstance];
//AVAudioSessionRouteDescription* prevRoute = [[notification userInfo] objectForKey:AVAudioSessionRouteChangePreviousRouteKey];
// Reason
NSInteger reason = [[[notification userInfo] objectForKey:AVAudioSessionRouteChangeReasonKey] integerValue];
switch (reason) {
case AVAudioSessionRouteChangeReasonNoSuitableRouteForCategory:
NSLog(@"] Audio Route: The route changed because no suitable route is now available for the specified category.");
break;
case AVAudioSessionRouteChangeReasonWakeFromSleep:
NSLog(@"] Audio Route: The route changed when the device woke up from sleep.");
break;
case AVAudioSessionRouteChangeReasonOverride:
NSLog(@"] Audio Route: The output route was overridden by the app.");
break;
case AVAudioSessionRouteChangeReasonCategoryChange:
NSLog(@"] Audio Route: The category of the session object changed.");
break;
case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:
NSLog(@"] Audio Route: The previous audio output path is no longer available.");
break;
case AVAudioSessionRouteChangeReasonNewDeviceAvailable:
NSLog(@"] Audio Route: A preferred new audio output path is now available.");
break;
case AVAudioSessionRouteChangeReasonUnknown:
NSLog(@"] Audio Route: The reason for the change is unknown.");
break;
default:
NSLog(@"] Audio Route: The reason for the change is very unknown.");
break;
}
// Output
AVAudioSessionPortDescription *output = [[session.currentRoute.outputs count]?session.currentRoute.outputs:nil objectAtIndex:0];
if ([output.portType isEqualToString:AVAudioSessionPortLineOut]) {
NSLog(@"] Audio Route: Output Port: LineOut");
}
else if ([output.portType isEqualToString:AVAudioSessionPortHeadphones]) {
NSLog(@"] Audio Route: Output Port: Headphones");
}
else if ([output.portType isEqualToString:AVAudioSessionPortBluetoothA2DP]) {
NSLog(@"] Audio Route: Output Port: BluetoothA2DP");
}
else if ([output.portType isEqualToString:AVAudioSessionPortBuiltInReceiver]) {
NSLog(@"] Audio Route: Output Port: BuiltInReceiver");
}
else if ([output.portType isEqualToString:AVAudioSessionPortBuiltInSpeaker]) {
NSLog(@"] Audio Route: Output Port: BuiltInSpeaker");
}
else if ([output.portType isEqualToString:AVAudioSessionPortHDMI]) {
NSLog(@"] Audio Route: Output Port: HDMI");
}
else if ([output.portType isEqualToString:AVAudioSessionPortAirPlay]) {
NSLog(@"] Audio Route: Output Port: AirPlay");
}
else if ([output.portType isEqualToString:AVAudioSessionPortBluetoothLE]) {
NSLog(@"] Audio Route: Output Port: BluetoothLE");
}
else {
NSLog(@"] Audio Route: Output Port: Unknown: %@",output.portType);
}
// Input
AVAudioSessionPortDescription *input = [[session.currentRoute.inputs count] ? session.currentRoute.inputs:nil objectAtIndex:0];
if ([input.portType isEqualToString:AVAudioSessionPortLineIn]) {
NSLog(@"] Audio Route: Input Port: LineIn");
}
else if ([input.portType isEqualToString:AVAudioSessionPortBuiltInMic]) {
NSLog(@"] Audio Route: Input Port: BuiltInMic");
}
else if ([input.portType isEqualToString:AVAudioSessionPortHeadsetMic]) {
NSLog(@"] Audio Route: Input Port: HeadsetMic");
}
else if ([input.portType isEqualToString:AVAudioSessionPortBluetoothHFP]) {
NSLog(@"] Audio Route: Input Port: BluetoothHFP");
}
else if ([input.portType isEqualToString:AVAudioSessionPortUSBAudio]) {
NSLog(@"] Audio Route: Input Port: USBAudio");
}
else if ([input.portType isEqualToString:AVAudioSessionPortCarAudio]) {
NSLog(@"] Audio Route: Input Port: CarAudio");
}
else {
NSLog(@"] Audio Input Port: Unknown: %@",input.portType);
}
NSLog(@"]--------------------------[ ]-----------------------------[");
}
オーディオ セッションのデリゲートも非推奨になっているため、必ずオブザーバーを追加してください。
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(audioInterruption:)
name: AVAudioSessionInterruptionNotification
object: nil];