#import <UIKit/UIKit.h>
#import <GLKit/GLKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreImage/CoreImage.h>
@interface ViewController : GLKViewController <AVCaptureVideoDataOutputSampleBufferDelegate> {
    AVCaptureSession *session;
    CIContext *coreImageContext;
}
@property (strong, nonatomic) EAGLContext *context;
@end

@implementation ViewController
@synthesize context = _context;
- (void)viewDidLoad{
    [super viewDidLoad];
    self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
    GLKView *view = (GLKView *)self.view;
    view.frame = CGRectMake(0, 0, 640, 1136);
    view.context = self.context;
    view.drawableDepthFormat = GLKViewDrawableDepthFormat24;
    coreImageContext = [CIContext contextWithEAGLContext:self.context];

    NSError * error;
    session = [[AVCaptureSession alloc] init];
    [session beginConfiguration];
    [session setSessionPreset:AVCaptureSessionPreset640x480];
    AVCaptureDevice * videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error];
    [session addInput:input];

    AVCaptureVideoDataOutput * dataOutput = [[AVCaptureVideoDataOutput alloc] init];
    [dataOutput setAlwaysDiscardsLateVideoFrames:YES]; 
    [dataOutput setVideoSettings:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA] forKey:(id)kCVPixelBufferPixelFormatTypeKey]];   
    [dataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];

    [session addOutput:dataOutput];
    [session commitConfiguration];
    NSArray *array = [[session.outputs objectAtIndex:0] connections];
    for (AVCaptureConnection *connection in array){
        connection.videoOrientation = AVCaptureVideoOrientationPortrait;
    }
    [session startRunning];
}

-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
    CVPixelBufferRef pixelBuffer = (CVPixelBufferRef)CMSampleBufferGetImageBuffer(sampleBuffer);
    CIImage *image = [CIImage imageWithCVPixelBuffer:pixelBuffer];
    CGRect rect = [image extent];
    rect.origin.y = 200;
    rect.size.width  =  640;
    rect.size.height  =  (640.0/480.0)*640;
    CIFilter *filter =[CIFilter filterWithName:@"CISepiaTone"];
    [filter setValue:image forKey:kCIInputImageKey];
    [filter setValue:@0.8 forKey:kCIInputIntensityKey];
    image = filter.outputImage;
    [coreImageContext drawImage:image inRect:rect fromRect:[image extent] ];
}
@end