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我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他们的库（iPod）播放音频。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？

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];
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3 回答 3

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];

}

于 2012-12-11T01:24:21.403 回答
0

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处理捕获中断，无论如何。我希望这会有所帮助。

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];
于 2011-11-14T16:33:18.700 回答
0

尝试弄乱音频会话！

这里有一个关于你能做什么的快速猜测，但我没有专门用 iPod 试过这个：

OSStatus status = noErr;
status |= AudioSessionInitialize(CFRunLoopGetMain(), kCFRunLoopCommonModes, PVAudioSessionInterruptionListener, NULL);

    status |= AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(UInt32), &(UInt32){kAudioSessionCategory_PlayAndRecord});

    status |= AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers,
                                      sizeof(UInt32),
                                      &(UInt32){true});

    status |= AudioSessionSetProperty(kAudioSessionProperty_OtherMixableAudioShouldDuck,
                                      sizeof(UInt32),
                                      &(UInt32){false});

status |= AudioSessionSetActive(YES);

if (status != noErr) {
    NSLog(@"ERROR: There was an error in setting the audio session");
}

我对环境声音音频类别也有一些运气（即使它给出了错误，它似乎允许在录制视频时播放音频）：

    status |= AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(UInt32), &(UInt32){kAudioSessionCategory_AmbientSound});
于 2012-08-01T08:14:43.263 回答