IOS 用AVFoundation 展示视频

////  Capter2ViewController.m//  IosTest////  Created by garin on 13-7-19.//  Copyright (c) 2013年 garin. All rights reserved.//#import "Capter2ViewController.h"@interface Capter2ViewController ()@end@implementation Capter2ViewController-(void) dealloc{    [session release];    [super dealloc];}- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    videoPreviewView=[[UIView alloc] initWithFrame:CGRectMake(10, 10, 320, 200)];    [self.view addSubview:videoPreviewView];    [videoPreviewView release];// Do any additional setup after loading the view.        //在viewdidload调用下面的函数显示摄像信息    [self setupCaptureSession];    //    imgView=[[UIImageView alloc] initWithFrame:CGRectMake(10, 230, 320, 100)];//    imgView.backgroundColor=[UIColor grayColor];//    [self.view addSubview:imgView];//    [imgView release];        UIButton *cloeseBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect];    cloeseBtn.frame=CGRectMake(10, 220, 300, 50);    [cloeseBtn setTitle:@"Press" forState:UIControlStateNormal];    [cloeseBtn addTarget:self action:@selector(closeBtnClick:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:cloeseBtn];}-(void) closeBtnClick:(id) sender{    [session stopRunning];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (void)setupCaptureSession{    NSError *error = nil;        // Create the session    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 = AVCaptureSessionPresetLow;        // 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);    //AVCaptureConnection *avcaptureconn=[[AVCaptureConnection alloc] init];    //[avcaptureconn setVideoMinFrameDuration:CMTimeMake(1, 15)];    // Start the session running to start the flow of data    [session startRunning];    AVCaptureVideoPreviewLayer* previewLayer = [AVCaptureVideoPreviewLayer layerWithSession: session];    previewLayer.frame = videoPreviewView.bounds; //视频显示到的UIView    previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;//    [previewLayer setOrientation:AVCaptureVideoOrientationLandscapeRight];    //if(previewLayer.orientationSupported){    //previewLayer.orientation = mOrientation;    //}        [videoPreviewView.layer addSublayer: previewLayer];        if(![session isRunning]){        [session startRunning];    }        // Assign session to an ivar.    //[self setSession:session];}//得到视频流- (void)captureOutput:(AVCaptureOutput *)captureOutputdidOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer       fromConnection:(AVCaptureConnection *)connection{    // Create a UIImage from the sample buffer data    return;        UIImage *image = [self imageFromSampleBuffer:sampleBuffer];    //得到的视频流图片    imgView.image=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);}@end