AVCaptureSession與閃光燈凍結在

我真的不知道這裏發生了什麼...相機預覽圖層似乎凍結，CaptureStill ...塊永遠不會被執行。但是，如果我在執行應用程序的開始時將閃光燈關閉，則可以很好地拍攝照片。還應該注意的是，我碰到這個線程：Toggling Flash on AVCaptureDevice requires Stopping and Starting AVCaptureSEssion，並決定繼續嘗試停止會話並重新啓動它，它似乎工作。沒有更多的凍結，但關閉會話並重新開啓後，攝像機會稍微凍結，這是不可接受的。思考？AVCaptureSession與閃光燈凍結在

- (void)cameraButtonPressed{ 
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 

[device lockForConfiguration:nil]; 

if ([defaults objectForKey:@"Flash"]) 
{ 
    SPFlashButton option = [[defaults objectForKey:@"Flash"] intValue]; 

    if (option == SPFlashButtonTypeOff) 
    { 
     [device setFlashMode:AVCaptureFlashModeOff]; 
    } 
    else if (option == SPFlashButtonTypeOn) 
    { 
     [device setFlashMode:AVCaptureFlashModeOn]; 
    } 
    else if (option == SPFlashButtonTypeAuto) 
    { 
     [device setFlashMode:AVCaptureFlashModeAuto]; 
    } 
} 
else 
{ 
    [device setFlashMode:AVCaptureFlashModeAuto]; 
} 

[device unlockForConfiguration]; 


AVCaptureConnection *stillImageConnection = nil; 
for (AVCaptureConnection *connection in stillImageOutput.connections) { 
    for (AVCaptureInputPort *port in [connection inputPorts]) { 
     if ([[port mediaType] isEqual:AVMediaTypeVideo]) { 
      stillImageConnection = connection; 
      break; 
     } 
    } 
    if (stillImageConnection) { break; } 
} 

UIDeviceOrientation curDeviceOrientation = [[UIDevice currentDevice] orientation]; 
AVCaptureVideoOrientation avcaptureOrientation = [self avOrientationForDeviceOrientation:curDeviceOrientation]; 
[stillImageConnection setVideoOrientation:avcaptureOrientation]; 
[stillImageConnection setVideoScaleAndCropFactor:self.zoomScale]; 

[stillImageOutput setOutputSettings:[NSDictionary dictionaryWithObject:AVVideoCodecJPEG 
                   forKey:AVVideoCodecKey]]; 

[stillImageOutput captureStillImageAsynchronouslyFromConnection:stillImageConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) { 
    NSData *jpegData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer]; 
    UIImage *image = [UIImage imageWithData:jpegData]; 

    //do stuff with the image 
}]; 
}

來源

2013-10-09 Homeschooldev

糟糕，我沒有將照片設置爲會話預設。這是在嘗試使用閃光燈時導致凍結的原因。

我所做的：

[captureSession setSessionPreset:AVCaptureSessionPreset640x480];

我應該做的：

[captureSession setSessionPreset:AVCaptureSessionPresetPhoto];

來源

2013-10-09 14:55:34 Homeschooldev

AVCaptureSession與閃光燈凍結在

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