Я пытаюсь использовать новый AVFoundation framework для снятия неподвижных изображений с iPhone.
При нажатии кнопки этот метод вызывается. Я слышу звук затвора, но я не вижу выход журнала. Если я вызову этот метод несколько раз, просмотр камеры заморозится.
Есть ли там учебник, как использовать captureStillImageAsynchronouslyFromConnection?
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:
[[self stillImageOutput].connections objectAtIndex:0]
completionHandler:^(CMSampleBufferRef imageDataSampleBuffer,
NSError *error) {
NSLog(@"inside");
}];
- (void)initCapture {
AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput
deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]
error:nil];
AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init];
captureOutput.alwaysDiscardsLateVideoFrames = YES;
dispatch_queue_t queue;
queue = dispatch_queue_create("cameraQueue", NULL);
[captureOutput setSampleBufferDelegate:self queue:queue];
dispatch_release(queue);
NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey;
NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];
NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key];
[captureOutput setVideoSettings:videoSettings];
self.captureSession = [[AVCaptureSession alloc] init];
self.captureSession.sessionPreset = AVCaptureSessionPresetLow;
[self.captureSession addInput:captureInput];
[self.captureSession addOutput:captureOutput];
self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession: self.captureSession];
[self.prevLayer setOrientation:AVCaptureVideoOrientationLandscapeLeft];
self.prevLayer.frame = CGRectMake(0.0, 0.0, 480.0, 320.0);
self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer: self.prevLayer];
// Setup the default file outputs
AVCaptureStillImageOutput *_stillImageOutput = [[[AVCaptureStillImageOutput alloc] init] autorelease];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:
AVVideoCodecJPEG, AVVideoCodecKey,
nil];
[_stillImageOutput setOutputSettings:outputSettings];
[outputSettings release];
[self setStillImageOutput:_stillImageOutput];
if ([self.captureSession canAddOutput:stillImageOutput]) {
[self.captureSession addOutput:stillImageOutput];
}
[self.captureSession commitConfiguration];
[self.captureSession startRunning];
}