How to get Picture frames by frames in Xcode - iphone

Question

Hi I want to get picture frames by frames using iphone back camera. What I have did so far.
I open Camera in full mode.
(IBAction) showCameraUI {
[self startCameraControllerFromViewController: self
usingDelegate: self];
}
(BOOL) startCameraControllerFromViewController: (UIViewController*) controller
usingDelegate: (id ) delegate {
if (([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypeCamera] == NO)
|| (delegate == nil)
|| (controller == nil))
return NO;
UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
// Displays a control that allows the user to choose picture or
// movie capture, if both are available:
cameraUI.mediaTypes =
[UIImagePickerController availableMediaTypesForSourceType:
UIImagePickerControllerSourceTypeCamera];
// Hides the controls for moving & scaling pictures, or for
// trimming movies. To instead show the controls, use YES.
cameraUI.allowsEditing = NO;
cameraUI.delegate = delegate;
cameraUI.showsCameraControls=NO;
cameraUI.navigationBarHidden=YES;
cameraUI.toolbarHidden=YES;
cameraUI.wantsFullScreenLayout=YES;
cameraUI.cameraViewTransform = CGAffineTransformScale(cameraUI.cameraViewTransform, CAMERA_SCALAR_SX, CAMERA_SCALAR_SY);
UIButton *btnRecording = [UIButton buttonWithType:UIButtonTypeRoundedRect];
CGRect buttonRect =CGRectMake(190 , 420, 100, 39); // position in the parent view and set the size of the button
btnRecording.frame = buttonRect;
[btnRecording setTitle:#"Recording" forState:UIControlStateNormal];
// add targets and actions
[btnRecording addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
cameraUI.cameraOverlayView= btnRecording;
[controller presentModalViewController: cameraUI animated: YES];
return YES;
}
Setup AVCapture to get pictures frames by frames.
(void)setupCaptureSession {
NSError *error = nil;
// Create the session
AVCaptureSession *session = [[AVCaptureSession alloc] init];
// session.AVCaptureTorchModeOn=YES;
// Configure the session to produce lower resolution video frames, if your
// processing algorithm can cope. We'll specify medium quality for the
// chosen device.
session.sessionPreset = AVCaptureSessionPresetLow;
// Find a suitable AVCaptureDevice
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
[device lockForConfiguration:nil];
[device setTorchMode:AVCaptureTorchModeOn]; // use AVCaptureTorchModeOff to turn off
[device unlockForConfiguration];
// Create a device input with the device and add it to the session.
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device
error:&error];
if (!input) {
// Handling the error appropriately.
}
[session addInput:input];
// Create a VideoDataOutput and add it to the session
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init] ;
// output.alwaysDiscardsLateVideoFrames = YES;
[session addOutput:output];
dispatch_queue_t queue = dispatch_queue_create("MyQueue", NULL);
[output setSampleBufferDelegate:self queue:queue];
dispatch_release(queue);
// Specify the pixel format
output.videoSettings =
[NSDictionary dictionaryWithObject:
[NSNumber numberWithInt:kCVPixelFormatType_32BGRA]
forKey:(id)kCVPixelBufferPixelFormatTypeKey];
// If you wish to cap the frame rate to a known value, such as 15 fps, set
// minFrameDuration.
// output.minFrameDuration = CMTimeMake(1, 1);
// Start the session running to start the flow of data
NSLog(#"session is going to start at here");
[session startRunning];
// Assign session to an ivar.
//[self setSession:session];
}
// Create a UIImage from sample buffer data
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer {
NSLog(#"picture is getting");
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
// Lock the base address of the pixel buffer
CVPixelBufferLockBaseAddress(imageBuffer,0);
// 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();
if (!colorSpace)
{
NSLog(#"CGColorSpaceCreateDeviceRGB failure");
return nil;
}
// Get the base address of the pixel buffer
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
// Get the data size for contiguous planes of the pixel buffer.
size_t bufferSize = CVPixelBufferGetDataSize(imageBuffer);
// Create a Quartz direct-access data provider that uses data we supply
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, baseAddress, bufferSize,
NULL);
// Create a bitmap image from data supplied by our data provider
CGImageRef cgImage =
CGImageCreate(width,
height,
8,
32,
bytesPerRow,
colorSpace,
kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little,
provider,
NULL,
true,
kCGRenderingIntentDefault);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
// Create and return an image object representing the specified Quartz image
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
return image;
}
// Delegate routine that is called when a sample buffer was written
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection {
// Create a UIImage from the sample buffer data
NSLog(#"picture is getting");
UIImage *image = [self imageFromSampleBuffer:sampleBuffer];
// [self.delegate cameraCaptureGotFrame:image];
}
Now Delegate "captureOutput"is not getting call.
I don't know where I am doing wrong. This will be help me. Thanks in advance.