iOS使用AVFoundation展示视频

这篇文章主要为大家详细介绍了iOS使用AVFoundation展示视频，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了iOS使用AVFoundation展示视频的具体代码，供大家参考，具体内容如下
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									//

									// 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 *)captureOutput

									didOutputSampleBuffer:(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