CameraTestAppDelegate.h

#import <UIKit/UIKit.h>

@interface CameraTestAppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;

- (void) cameraControllerReadyStateChanged:(NSNotification*)aNotification;
- (void) cameraController:(id)sender tookPicture:(UIImage*)picture withPreview:(UIImage*)preview jpegData:(NSData*)rawData imageProperties:(struct __CFDictionary*) imageProperties;

@end

CameraTestAppDelegate.m

#import "CameraTestAppDelegate.h"
#import "PLCameraController.h"

@implementation CameraTestAppDelegate

@synthesize window;

- (void)applicationDidFinishLaunching:(UIApplication *)application {
  [application setStatusBarHidden:YES animated:NO];
  
  PLCameraController* cameraController = [PLCameraController sharedInstance];
  // [cameraController setDelegate:self];
  [cameraController startPreview];

  UIView *view = [cameraController previewView];
  view.frame = CGRectMake(0, 0, 320, 480);
  
  [window addSubview:view];
  [window makeKeyAndVisible];
}

- (void) cameraControllerReadyStateChanged:(NSNotification*)aNotification {
}

- (void) cameraController:(id)sender tookPicture:(UIImage*)picture withPreview:(UIImage*)preview jpegData:(NSData*)rawData imageProperties:(struct __CFDictionary*) imageProperties {
//  UIImageWriteToSavedPhotosAlbum(preview, self, nil, nil);
//  NSString *filePath = [NSString stringWithFormat:@"%@%@", NSHomeDirectory(), @"/Documents/image.jpg"];
//  [rawData writeToFile:filePath atomically:YES];
//  
//  CGImageRef *cGImageRef = [window _createCGImageRefRepresentationInFrame: [window bounds]];
//  NSData *rawData = UIImageJPEGRepresentation([UIImage imageWithCGImage: cGImageRef], compressRatio);
}

- (void)dealloc {
    [window release];
    [super dealloc];
}

@end

PLCameraController.h

@interface PLCameraController : NSObject
{
    CALayer *_cameraLayer;
    struct CameraDevice *_camera;
    struct CameraImageQueueHelper *_cameraHelper;
    id _delegate;
    UIView *_previewView;
    BOOL _isPreviewing;
    BOOL _isLocked;
    BOOL _wasPreviewingBeforeDeviceLock;
}

+ (id)sharedInstance;
- (id)init;
- (void)dealloc;
- (void)_setIsReady;
- (BOOL)isReady;
- (void)_applicationSuspended;
- (void)_applicationResumed;
- (void)_tookPicture:(struct __CoreSurfaceBuffer *)fp8;
- (void)_tookPicture:(struct CGImage *)fp8 jpegData:(struct __CFData *)fp12 imageProperties:(struct __CFDictionary *)fp16;
- (struct CameraImageQueueHelper *)_cameraHelper;
- (BOOL)_setupCamera;
- (void)_tearDownCamera;
- (void)setDelegate:(id)fp8;
- (id)delegate;
- (struct CGRect)_cameraFrame;
- (id)previewView;
- (void)startPreview;
- (void)stopPreview;
- (void)capturePhoto;

@end