iphone - 音频将使 AVCaptureSession 终止

Question

我编写了一个应用程序来从 iPhone 录制视频。它工作正常，但有一个大问题。 当 AVCaptureSession 开始运行并且用户尝试从其库(iPod)播放音频时。 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此问题吗？

<小时/>

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

这对我有用:

- (void)setupAudio {
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: nil];
    UInt32 doSetProperty = 1;
    AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(doSetProperty), &doSetProperty);
    [[AVAudioSession sharedInstance] setActive: YES error: nil];

}