需要添加的framework:CoreMedia,CoreVideo,QuartzCore,AVFoundation
MyAVController.h:
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#import <UIKit/UIKit.h>#import <AVFoundation/AVFoundation.h>#import <CoreGraphics/CoreGraphics.h>#import <CoreVideo/CoreVideo.h>#import <CoreMedia/CoreMedia.h>@interface MyAVController : UIViewController <AVCaptureVideoDataOutputSampleBufferDelegate> { AVCaptureSession *_captureSession; UIImageView *_imageView; CALayer *_customLayer; AVCaptureVideoPreviewLayer *_prevLayer;}@property (nonatomic, retain) AVCaptureSession *captureSession;@property (nonatomic, retain) UIImageView *imageView;@property (nonatomic, retain) CALayer *customLayer;@property (nonatomic, retain) AVCaptureVideoPreviewLayer *prevLayer;- (void)initCapture;@endMyAVController.m:#import "MyAVController.h"@implementation MyAVController@synthesize captureSession = _captureSession;@synthesize imageView = _imageView;@synthesize customLayer = _customLayer;@synthesize prevLayer = _prevLayer;#pragma mark -#pragma mark Initialization- (id)init { self = [super init]; if (self) { self.imageView = nil; self.prevLayer = nil; self.customLayer = nil; } return self;}- (void)viewDidLoad { [self initCapture];}- (void)initCapture { AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo] error:nil]; AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc]init]; captureOutput.alwaysDiscardsLateVideoFrames = YES; //captureOutput.minFrameDuration = CMTimeMake(1, 10); dispatch_queue_t queue; queue = dispatch_queue_create("cameraQueue", NULL); [captureOutput setSampleBufferDelegate:self queue:queue]; dispatch_release(queue); NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey; NSNumber* value = [NSNumbernumberWithUnsignedInt:kCVPixelFormatType_32BGRA]; NSDictionary* videoSettings = [NSDictionarydictionaryWithObject:value forKey:key]; [captureOutput setVideoSettings:videoSettings]; self.captureSession = [[AVCaptureSession alloc] init]; [self.captureSession addInput:captureInput]; [self.captureSession addOutput:captureOutput]; [self.captureSession startRunning]; self.customLayer = [CALayer layer]; self.customLayer.frame = self.view.bounds; self.customLayer.transform = CATransform3DRotate(CATransform3DIdentity, M_PI/2.0f, 0, 0, 1); self.customLayer.contentsGravity = kCAGravityResizeAspectFill; [self.view.layer addSublayer:self.customLayer]; self.imageView = [[UIImageView alloc] init]; self.imageView.frame = CGRectMake(0, 0, 100, 100); [self.view addSubview:self.imageView]; self.prevLayer = [AVCaptureVideoPreviewLayerlayerWithSession: self.captureSession]; self.prevLayer.frame = CGRectMake(100, 0, 100, 100); self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer: self.prevLayer];}#pragma mark -#pragma mark AVCaptureSession delegate- (void)captureOutput:(AVCaptureOutput *)captureOutputdidOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection{ NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); CVPixelBufferLockBaseAddress(imageBuffer,0); uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer); size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); size_t width = CVPixelBufferGetWidth(imageBuffer); size_t height = CVPixelBufferGetHeight(imageBuffer); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace,kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst); CGImageRef newImage = CGBitmapContextCreateImage(newContext); CGContextRelease(newContext); CGColorSpaceRelease(colorSpace); [self.customLayer performSelectorOnMainThread:@selector(setContents:)withObject: (id) newImage waitUntilDone:YES]; UIImage *image= [UIImage imageWithCGImage:newImage scale:1.0orientation:UIImageOrientationRight]; CGImageRelease(newImage); [self.imageView performSelectorOnMainThread:@selector(setImage:)withObject:image waitUntilDone:YES]; CVPixelBufferUnlockBaseAddress(imageBuffer,0); [pool drain];}#pragma mark -#pragma mark Memory management- (void)viewDidUnload { self.imageView = nil; self.customLayer = nil; self.prevLayer = nil;}- (void)dealloc { [self.captureSession release]; [super dealloc];}@end |
原文来自：http://www.benjaminloulier.com/articles/ios4-and-direct-access-to-the-camera