如何通过内置的耳机扬声器播放音频 [英] How to play audio through built-in earpiece speaker

问题描述

我已经看到一些类似WhatsApp的应用程序具有一项功能，当用户将设备靠近耳边时，它只能通过听筒(电话扬声器)播放音频剪辑.否则，它将通过普通的内置扬声器播放.

I have seen some apps like WhatsApp has a feature to play audio clips only through earpiece(phone call speaker) when the user brings up the device near to ear. Otherwise its playing via normal built-in speaker.

我正在使用MPMoviePlayer播放音频剪辑.

I am using MPMoviePlayer for playing audio clips.

我确实在互联网上经历了很多类似的问题和答案，所有答案都表明将AudioSession类别设置为PlayAndRecord.而已.

I did go through lots of similar questions and answers on the internet, and all the answers say to set the AudioSession Category to PlayAndRecord. Thats it.

我做了同样的事情，但是无法获得我想要得到的确切结果.

I did the same, but couldn't get the exact result that I want to get.

// Audio Player
self.audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[audioSession setActive:YES error:nil];
self.moviePlayer = [[MPMoviePlayerController alloc] init];
self.moviePlayer.view.hidden = YES;

//    AVAudioSessionPortDescription *routePort = self.audioSession.currentRoute.outputs.firstObject;
//    NSString *portType = routePort.portType;
//    
//    if ([portType isEqualToString:@"Receiver"]) {
//        [self.audioSession  overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:nil];
//    } else {
//        [self.audioSession  overrideOutputAudioPort:AVAudioSessionPortOverrideNone error:nil];
//    }

任何人都可以告诉我如何以及在哪里修改声音源，以便仅在用户拿起设备时通过听筒扬声器播放音频吗?

Can anyone please show me how and where can I modify the source to play audio through the earpiece speaker only when the user brings up the device?

推荐答案

我可以使用AVAudioSession和ProximityMonitering

I could do it using AVAudioSession and ProximityMonitering

- (void)viewDidLoad {
    [super viewDidLoad];

    [UIDevice currentDevice].proximityMonitoringEnabled = YES;

    if ([UIDevice currentDevice].proximityMonitoringEnabled == YES) {
        [[NSNotificationCenter defaultCenter] addObserver:self
                                               selector:@selector(proximityChanged:)
                                                     name:@"UIDeviceProximityStateDidChangeNotification"
                                               object:[UIDevice currentDevice]];
    }
}


- (void) proximityChanged:(NSNotification *)notification {
    UIDevice *device = [notification object];
    NSLog(@"In proximity: %i", device.proximityState);

    if(device.proximityState == 0){
        [audioSession  overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:nil];
    }
    else{
        [audioSession  overrideOutputAudioPort:AVAudioSessionPortOverrideNone error:nil];
    }
}

播放音频

audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[audioSession setActive:YES error:nil];

AVAudioSessionPortDescription *routePort = audioSession.currentRoute.outputs.firstObject;
NSString *portType = routePort.portType;

NSLog(@"PortType %@", portType);

if ([portType isEqualToString:@"Receiver"]) {
    [audioSession  overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:nil];
}

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