I’m using an AVCaptureView on OS X 10.10 to read a QR code from the camera
(i.e. the built-in one on my MacBook Pro.) Everything’s working — my delegate
receives frames, and using a CIDetector it can read a QR code held up to the
camera — except that the view doesn’t show the video from the camera. Instead
it just shows an icon of a camera with a line through it and the message “No
camera selected.” Which is clearly bogus because the camera _is_ selected, its
LED is on, and video _is_ being captured by the session and sent to my delegate.
Below is my code that sets up the view. What am I missing?
(Feel free to tell me to take this to another list, but
AVCaptureSession* session = [[AVCaptureSession alloc] init];
AVCaptureDevice* video = [AVCaptureDevice defaultDeviceWithMediaType:
AVMediaTypeVideo];
AVCaptureDeviceInput* input = [AVCaptureDeviceInput deviceInputWithDevice:
video error: NULL];
[session addInput: input];
AVCaptureVideoDataOutput* output = [[AVCaptureVideoDataOutput alloc] init];
[output setSampleBufferDelegate: self queue: dispatch_get_main_queue()];
output.alwaysDiscardsLateVideoFrames = YES;
[session addOutput: output];
[session startRunning];
[captureView setSession: session showVideoPreview: YES showAudioPreview:
NO];
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