相关疑难解决方法(0)

我想在两个相互靠近的UIViews中显示iPad2的前置和后置摄像头的流.要流式传输一个设备的图像,我使用以下代码

AVCaptureDeviceInput *captureInputFront = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo] error:nil];

AVCaptureSession *session = [[AVCaptureSession alloc] init];
session addInput:captureInputFront];
session setSessionPreset:AVCaptureSessionPresetMedium];
session startRunning];

AVCaptureVideoPreviewLayer *prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];
prevLayer.frame = self.view.frame;
[self.view.layer addSublayer:prevLayer];

这适用于任何一台相机.为了并行显示流,我尝试创建另一个会话,但是第二个会话建立后,第一个会话冻结.

然后我尝试向会话添加两个AVCaptureDeviceInput,但目前最多支持一个输入.

任何有用的想法如何从两个相机流？

我使用标准AVFoundation类来捕获视频和显示预览(http://developer.apple.com/library/ios/#qa/qa1702/_index.html)

这是我的代码:

- (void)setupCaptureSession {       
    NSError *error = nil;

    [self setCaptureSession: [[AVCaptureSession alloc] init]]; 

    self.captureSession.sessionPreset = AVCaptureSessionPresetMedium;

    device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    if ([device isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus] && [device lockForConfiguration:&error]) {
        [device setFocusMode:AVCaptureFocusModeContinuousAutoFocus];
        [device unlockForConfiguration];
    }

    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device 
                                                                        error:&error];
    if (!input) {
        // TODO: Obs?uga b??du, gdy nie uda si? utworzy? wej?cia
    }
    [[self captureSession] addInput:input];

    AVCaptureVideoDataOutput *output = [[[AVCaptureVideoDataOutput alloc] init] autorelease];
    [[self captureSession] addOutput:output];

    dispatch_queue_t queue = dispatch_queue_create("myQueue", NULL);
    [output setSampleBufferDelegate:self queue:queue];
    dispatch_release(queue);

    output.videoSettings = 
    [NSDictionary …