音频将使AVCaptureSession终止

Question

我写了一个应用程序来录制iPhone的视频.它工作正常,但有一个大问题.当AVCaptureSession开始运行并且用户尝试播放来自其库(iPod)的音频时.此操作将使AVCaptureSession终止.有什么想法可以阻止用户尝试播放音频或解决这个问题？

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这是我的代码:

videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];           
audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];

AVCaptureDeviceInput *videoDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:videoDevice error:nil];
AVCaptureDeviceInput *audioDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:audioDevice error:nil];

movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

captureSession = [[AVCaptureSession alloc] init];

[captureSession beginConfiguration];
[captureSession setSessionPreset:AVCaptureSessionPresetHigh];
[captureSession addInput:videoDeviceInput];
[captureSession addInput:audioDeviceInput];
[captureSession addOutput:movieFileOutput];
[captureSession commitConfiguration];

[captureSession startRunning];

Answer 1

您需要使用NSNotificationCenter. 使用下面的代码（我还包括了一些其他有用的方法），并编写一个方法来AVCaptureSessionWasInterruptedNotification以任何方式处理捕获中断。我希望这有帮助。

NSNotificationCenter *notify = [NSNotificationCenter defaultCenter];
[notify addObserver: self selector: @selector(onVideoError:) name: AVCaptureSessionRuntimeErrorNotification object: captureSession];
[notify addObserver: self selector: @selector(onVideoInterrupted:) name: AVCaptureSessionWasInterruptedNotification object: captureSession];
[notify addObserver: self selector: @selector(onVideoEnded:) name: AVCaptureSessionInterruptionEndedNotification object: captureSession];
[notify addObserver: self selector: @selector(onVideoDidStopRunning:) name: AVCaptureSessionDidStopRunningNotification object: captureSession];
[notify addObserver: self selector: @selector(onVideoStart:) name: AVCaptureSessionDidStartRunningNotification object: captureSession];