#import <AVFoundation/AVFoundation.h>

// Create and configure a capture session and start it running

- (void)setupCaptureSession

{

    NSError *error = nil;

    // Create the session

    AVCaptureSession *session = [[AVCaptureSession alloc] init];

    // 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 = AVCaptureSessionPresetMedium;

    // Find a suitable AVCaptureDevice

    AVCaptureDevice *device = [AVCaptureDevice

                             defaultDeviceWithMediaType:AVMediaTypeVideo];

    // 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] autorelease];

    [session addOutput:output];

    // Configure your 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, 15);

    // Start the session running to start the flow of data

    [session startRunning];

    // Assign session to an ivar.

    [self setSession:session];

}

// 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

    UIImage *image = [self imageFromSampleBuffer:sampleBuffer];

     < Add your code here that uses the image >

}

// Create a UIImage from sample buffer data

- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer

{

    // Get a CMSampleBuffer's Core Video image buffer for the media data

    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

    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);

}