iOS 获取照相机实时预览图片

使用Objective-C实现
AVController.h头文件

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreGraphics/CoreGraphics.h>
#import <CoreVideo/CoreVideo.h>
#import <CoreMedia/CoreMedia.h>@interface AVController : 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;@end

AVController.m实现

@implementation AVController//@synthesize captureSession = _captureSession;
//@synthesize imageView = _imageView;
//@synthesize customLayer = _customLayer;
//@synthesize prevLayer = _prevLayer;- (void)viewDidLoad
{[super viewDidLoad];[self initCapture];
}/*** 初始化摄像头*/
- (void)initCapture {AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:device  error:nil];AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc]init];captureOutput.alwaysDiscardsLateVideoFrames = YES;// captureOutput.minFrameDuration = CMTimeMake(1, 10);dispatch_queue_t queue = dispatch_queue_create("cameraQueue", NULL);[captureOutput setSampleBufferDelegate:self queue:queue];NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey;NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];NSDictionary* videoSettings = [NSDictionary dictionaryWithObject: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];CGRect frame = self.view.bounds;frame.origin.y = 64;frame.size.height = frame.size.height - 64;self.customLayer.frame = frame;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, 64, 100, 100);[self.view addSubview:self.imageView];self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession: self.captureSession];self.prevLayer.frame = CGRectMake(100, 64, 100, 100);self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer: self.prevLayer];UIButton *back = [[UIButton alloc]init];[back setTitle:@"Back" forState:UIControlStateNormal];[back setTitleColor:[UIColor redColor] forState:UIControlStateNormal];[back sizeToFit];frame = back.frame;frame.origin.y = 25;back.frame = frame;[self.view addSubview:back];[back addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];
}-(void)back:(id)sender{[self dismissViewControllerAnimated:true completion:nil];
}- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBufferfromConnection:(AVCaptureConnection *)connection
{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);id object = (__bridge id)newImage;// http://www.cnblogs.com/zzltjnh/p/3885012.html[self.customLayer performSelectorOnMainThread:@selector(setContents:) withObject: object waitUntilDone:YES];UIImage *image= [UIImage imageWithCGImage:newImage scale:1.0 orientation:UIImageOrientationRight];// releaseCGImageRelease(newImage);[self.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:YES];CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
}- (void)viewDidUnload {[self.captureSession stopRunning];self.imageView = nil;self.customLayer = nil;self.prevLayer = nil;
}- (void) dealloc {
//  [self.captureSession release];
}@end

使用Swift实现

import UIKitclass MyAVController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate {var captureSession:AVCaptureSession!var customLayer:CALayer!var imageView:UIImageView!var previewLayer:AVCaptureVideoPreviewLayer!override func viewDidLoad() {let device = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo)let captureInput = try? AVCaptureDeviceInput(device: device[0] as! AVCaptureDevice)let captureOutput = AVCaptureVideoDataOutput()captureOutput.alwaysDiscardsLateVideoFrames = truelet queue = dispatch_queue_create("cameraQueue", nil)captureOutput.setSampleBufferDelegate(self, queue: queue)let key = kCVPixelBufferPixelFormatTypeKey as NSStringlet value = NSNumber(unsignedInt: kCVPixelFormatType_32BGRA)let videoSettings = [key: value]captureOutput.videoSettings = videoSettingscaptureSession = AVCaptureSession()captureSession.addInput(captureInput)captureSession.addOutput(captureOutput)captureSession.startRunning()customLayer = CALayer()var frame = self.view.boundsframe.origin.y = 64frame.size.height = frame.size.height - 64customLayer.frame = framecustomLayer.transform = CATransform3DRotate(CATransform3DIdentity, CGFloat(M_PI) / 2.0, 0, 0, 1)customLayer.contentsGravity = kCAGravityResizeAspectFillself.view.layer.addSublayer(customLayer)imageView = UIImageView()imageView.frame = CGRectMake(0, 64, 100, 100)self.view.addSubview(imageView)previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)previewLayer.frame = CGRectMake(100, 64, 100, 100)previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFillself.view.layer.addSublayer(previewLayer)let btn = UIButton()btn.setTitle("Back", forState: .Normal)btn.setTitleColor(UIColor.redColor(), forState: .Normal)btn.sizeToFit()frame = btn.frameframe.origin.y = 25btn.frame = frameself.view.addSubview(btn)btn.addTarget(self, action: "back:", forControlEvents: .TouchUpInside)}func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!){let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)!CVPixelBufferLockBaseAddress(imageBuffer, 0)let baseAddress = CVPixelBufferGetBaseAddress(imageBuffer)let bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer)let width = CVPixelBufferGetWidth(imageBuffer)let height = CVPixelBufferGetHeight(imageBuffer)let colorSpace = CGColorSpaceCreateDeviceRGB()
//    let bmpInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedFirst.rawValue|CGBitmapInfo.ByteOrder32Little.rawValue)let newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, CGImageAlphaInfo.PremultipliedFirst.rawValue|CGBitmapInfo.ByteOrder32Little.rawValue)let newImage = CGBitmapContextCreateImage(newContext)customLayer.performSelectorOnMainThread("setContents:", withObject: newImage, waitUntilDone: true)let image = UIImage(CGImage: newImage!, scale: 1.0, orientation: UIImageOrientation.Right)imageView.performSelectorOnMainThread("setImage:", withObject: image, waitUntilDone: true)CVPixelBufferUnlockBaseAddress(imageBuffer, 0);}func back(sender:AnyObject) {self.dismissViewControllerAnimated(true, completion: nil)}override func viewWillDisappear(animated: Bool) {super.viewWillDisappear(animated)captureSession.stopRunning()}
}

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