나는 며칠 동안 내 머리를 두드렸다.AVCaptureVideoPreviewLayer 위에 직사각형을 그릴 수 있습니까?
CALayer (AVCaptureVideoPreviewLayer) 위에 직사각형을 그려야하는데, 이것은 iPhone4의 카메라에서 가져온 비디오 피드 일뿐입니다.
여기가 내 설정의 일부입니다.
//(in function for initialization)
-(void)initDevices {
AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo] error:nil];
AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init];
captureOutput.alwaysDiscardsLateVideoFrames = YES;
captureOutput.minFrameDuration = CMTimeMake(1, 30);
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 addInput:captureInput];
[self.captureSession addOutput:captureOutput];
[self.captureSession setSessionPreset:AVCaptureSessionPresetHigh];
self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession: self.captureSession];
self.prevLayer.frame = CGRectMake(0, 0, 400, 400);
self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
self.prevLayer.delegate = self;
[self.view.layer addSublayer: self.prevLayer];
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection {
[self performSelectorOnMainThread:@selector(drawme) withObject:nil waitUntilDone:YES];
}
- (void)drawme {
[self.prevLayer setNeedsDisplay];
}
//delegate function that draws to a CALayer
- (void)drawLayer:(CALayer*)layer inContext:(CGContextRef)ctx {
NSLog(@"hello layer!");
CGContextSetRGBFillColor (ctx, 1, 0, 0, 1);
CGContextFillRect (ctx, CGRectMake (0, 0, 200, 100));
}
이 경우에도 가능합니까? 현재 코드에서 "hello layer"인쇄를 얻지 만 카메라 피드에 채워진 사각형이 없습니다.
도움이 될 것입니다. :)