iOS使用AVFoundation展示视频

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

//
// 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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。