ios AVCaptureVideoPreviewLayer 현재 이미지 캡처

Question

기본 iPhone 카메라 앱이 사진을 찍으면 미리보기가 나타나고 이미지가 카메라 롤 버튼에 애니메이션으로 표시됩니다. 이 애니메이션을 복제하려고합니다.

AVCaptureConnection *videoConnection = nil; 
for (AVCaptureConnection *connection in _stillImageOutput.connections) 
{ 
    for (AVCaptureInputPort *port in [connection inputPorts]) 
    { 
     if ([[port mediaType] isEqual:AVMediaTypeVideo]) 
     { 
      videoConnection = connection; 
      break; 
     } 
    } 
    if (videoConnection) { break; } 
} 
NSLog(@"about to request a capture from: %@", _stillImageOutput); 
[_stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) 
{ 
    CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, NULL); 
    if (exifAttachments) 
    { 
     // Do something with the attachments. 
     NSLog(@"attachements: %@", exifAttachments); 
    } 
    else 
     NSLog(@"no attachments"); 

    NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer]; 
    UIImage *image = [[UIImage alloc] initWithData:imageData]; 
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil); 
}];  

이 전체 사진 이미지를 필요하지만 나는 또한 내가 애니메이션을 복제에 사용할 수 AVCaptureVideoPreviewLayer에서 이미지를 필요

session = [[AVCaptureSession alloc] init]; 
session.sessionPreset = AVCaptureSessionPresetPhoto; 

CALayer *viewLayer = self.vImagePreview.layer; 
NSLog(@"viewLayer = %@", viewLayer); 

captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session]; 

captureVideoPreviewLayer.frame = CGRectMake(0, 0, 322, 425); 
[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer]; 



device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; 

NSError *error = nil; 
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error]; 
if (!input) { 
    // Handle the error appropriately. 
    NSLog(@"ERROR: trying to open camera: %@", error); 
} 
[session addInput:input]; 
_stillImageOutput = [[AVCaptureStillImageOutput alloc] init]; 
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil]; 
[_stillImageOutput setOutputSettings:outputSettings]; 
[session addOutput:_stillImageOutput]; 

이 나는 ​​이미지를 촬영하는 방법입니다. AVCaptureVideoPreviewLayer에 현재 표시된 이미지를 얻으려면 어떻게해야합니까?

Answer 1

이 작업을 수행 할 수있는 방법은 세션에 다른 출력을 추가하는 것입니다

 - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer 
    fromConnection:(AVCaptureConnection *)connection{ 


// Create a UIImage from the sample buffer data 
UIImage *image = [self imageFromSampleBuffer:sampleBuffer]; 
rotatedScreenImage = rotateUIImage(image, 90.0);} 
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer{ 
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); 

CVPixelBufferLockBaseAddress(imageBuffer, 0); 

// Get the number of bytes per row for the pixel buffer 
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer); 

// Get the number of bytes per row for the pixel buffer 
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); 
// Get the pixel buffer width and height 
size_t width = CVPixelBufferGetWidth(imageBuffer); 
size_t height = CVPixelBufferGetHeight(imageBuffer); 

// Create a device-dependent RGB color space 
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 

// Create a bitmap graphics context with the sample buffer data 
CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8, 
              bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst); 
// Create a Quartz image from the pixel data in the bitmap graphics context 
CGImageRef quartzImage = CGBitmapContextCreateImage(context); 
// Unlock the pixel buffer 
CVPixelBufferUnlockBaseAddress(imageBuffer,0); 


// Free up the context and color space 
CGContextRelease(context); 
CGColorSpaceRelease(colorSpace); 

// Create an image object from the Quartz image 
UIImage *image = [UIImage imageWithCGImage:quartzImage]; 

// Release the Quartz image 
CGImageRelease(quartzImage); 

return (image); 

}

:

frameOutput = [[AVCaptureVideoDataOutput alloc] init]; 
frameOutput.videoSettings = @{(id)kCVPixelBufferPixelFormatTypeKey : @(kCVPixelFormatType_32BGRA)}; 

[frameOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()]; 

을 그리고 당신은 당신이 버퍼의 현재 이미지를 얻을 수 있다는 것을 일단

그리고 그 반환 (이미지) 실제로 화면 버퍼에 무엇입니까.