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
//
//Createdbygarinon13-7-19.
//Copyright(c)2013年garin.Allrightsreserved.
//
#import"Capter2ViewController.h"
@interfaceCapter2ViewController()
@end
@implementationCapter2ViewController
-(void)dealloc
{
[sessionrelease];
[superdealloc];
}
-(id)initWithNibName:(NSString*)nibNameOrNilbundle:(NSBundle*)nibBundleOrNil
{
self=[superinitWithNibName:nibNameOrNilbundle:nibBundleOrNil];
if(self){
//Custominitialization
}
returnself;
}
-(void)viewDidLoad
{
[superviewDidLoad];
videoPreviewView=[[UIViewalloc]initWithFrame:CGRectMake(10,10,320,200)];
[self.viewaddSubview:videoPreviewView];
[videoPreviewViewrelease];
//Doanyadditionalsetupafterloadingtheview.
//在viewdidload调用下面的函数显示摄像信息
[selfsetupCaptureSession];
//imgView=[[UIImageViewalloc]initWithFrame:CGRectMake(10,230,320,100)];
//imgView.backgroundColor=[UIColorgrayColor];
//[self.viewaddSubview:imgView];
//[imgViewrelease];
UIButton*cloeseBtn=[UIButtonbuttonWithType:UIButtonTypeRoundedRect];
cloeseBtn.frame=CGRectMake(10,220,300,50);
[cloeseBtnsetTitle:@"Press"forState:UIControlStateNormal];
[cloeseBtnaddTarget:selfaction:@selector(closeBtnClick:)forControlEvents:UIControlEventTouchUpInside];
[self.viewaddSubview:cloeseBtn];
}
-(void)closeBtnClick:(id)sender
{
[sessionstopRunning];
}
-(void)didReceiveMemoryWarning
{
[superdidReceiveMemoryWarning];
//Disposeofanyresourcesthatcanberecreated.
}
-(void)setupCaptureSession
{
NSError*error=nil;
//Createthesession
session=[[AVCaptureSessionalloc]init];
//Configurethesessiontoproducelowerresolutionvideoframes,ifyour
//processingalgorithmcancope.We'llspecifymediumqualityforthe
//chosendevice.
session.sessionPreset=AVCaptureSessionPresetLow;
//FindasuitableAVCaptureDevice
AVCaptureDevice*device=[AVCaptureDevice
defaultDeviceWithMediaType:AVMediaTypeVideo];
//Createadeviceinputwiththedeviceandaddittothesession.
AVCaptureDeviceInput*input=[AVCaptureDeviceInputdeviceInputWithDevice:device
error:&error];
if(!input){
//Handlingtheerrorappropriately.
}
[sessionaddInput:input];
//CreateaVideoDataOutputandaddittothesession
AVCaptureVideoDataOutput*output=[[[AVCaptureVideoDataOutputalloc]init]autorelease];
[sessionaddOutput:output];
//Configureyouroutput.
dispatch_queue_tqueue=dispatch_queue_create("myQueue",NULL);
[outputsetSampleBufferDelegate:selfqueue:queue];
dispatch_release(queue);
//Specifythepixelformat
output.videoSettings=
[NSDictionarydictionaryWithObject:
[NSNumbernumberWithInt:kCVPixelFormatType_32BGRA]
forKey:(id)kCVPixelBufferPixelFormatTypeKey];
//Ifyouwishtocaptheframeratetoaknownvalue,suchas15fps,set
//minFrameDuration.
//output.minFrameDuration=CMTimeMake(1,15);
//AVCaptureConnection*avcaptureconn=[[AVCaptureConnectionalloc]init];
//[avcaptureconnsetVideoMinFrameDuration:CMTimeMake(1,15)];
//Startthesessionrunningtostarttheflowofdata
[sessionstartRunning];
AVCaptureVideoPreviewLayer*previewLayer=[AVCaptureVideoPreviewLayerlayerWithSession:session];
previewLayer.frame=videoPreviewView.bounds;//视频显示到的UIView
previewLayer.videoGravity=AVLayerVideoGravityResizeAspectFill;
//[previewLayersetOrientation:AVCaptureVideoOrientationLandscapeRight];
//if(previewLayer.orientationSupported){
//previewLayer.orientation=mOrientation;
//}
[videoPreviewView.layeraddSublayer:previewLayer];
if(![sessionisRunning]){
[sessionstartRunning];
}
//Assignsessiontoanivar.
//[selfsetSession:session];
}
//得到视频流
-(void)captureOutput:(AVCaptureOutput*)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection*)connection
{
//CreateaUIImagefromthesamplebufferdata
return;
UIImage*image=[selfimageFromSampleBuffer:sampleBuffer];
//得到的视频流图片
imgView.image=image;
}
//CreateaUIImagefromsamplebufferdata
-(UIImage*)imageFromSampleBuffer:(CMSampleBufferRef)sampleBuffer
{
//GetaCMSampleBuffer'sCoreVideoimagebufferforthemediadata
CVImageBufferRefimageBuffer=CMSampleBufferGetImageBuffer(sampleBuffer);
//Lockthebaseaddressofthepixelbuffer
CVPixelBufferLockBaseAddress(imageBuffer,0);
//Getthenumberofbytesperrowforthepixelbuffer
void*baseAddress=CVPixelBufferGetBaseAddress(imageBuffer);
//Getthenumberofbytesperrowforthepixelbuffer
size_tbytesPerRow=CVPixelBufferGetBytesPerRow(imageBuffer);
//Getthepixelbufferwidthandheight
size_twidth=CVPixelBufferGetWidth(imageBuffer);
size_theight=CVPixelBufferGetHeight(imageBuffer);
//Createadevice-dependentRGBcolorspace
CGColorSpaceRefcolorSpace=CGColorSpaceCreateDeviceRGB();
//Createabitmapgraphicscontextwiththesamplebufferdata
CGContextRefcontext=CGBitmapContextCreate(baseAddress,width,height,8,
bytesPerRow,colorSpace,kCGBitmapByteOrder32Little|kCGImageAlphaPremultipliedFirst);
//CreateaQuartzimagefromthepixeldatainthebitmapgraphicscontext
CGImageRefquartzImage=CGBitmapContextCreateImage(context);
//Unlockthepixelbuffer
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
//Freeupthecontextandcolorspace
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
//CreateanimageobjectfromtheQuartzimage
UIImage*image=[UIImageimageWithCGImage:quartzImage];
//ReleasetheQuartzimage
CGImageRelease(quartzImage);
return(image);
}
@end
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