iphone视频聊天代码实现

转自：http://blog.csdn.net/zxc110110/article/details/7191016

视频聊天从摄像头中取得缓冲数据，转换成NSData，通过网络发送，接收端取得NSData后把NSData转换成图像，双方不停的收发数据，播放图像，就形成了视频聊天。废话不多说，直接上代码：

首先创建视频输入输出：

NSError *error= nil;

//Setup the video input

AVCaptureDevice *videoDevice=[self getFrontCamera];//[AVCaptureDevicedefaultDeviceWithMediaType: AVMediaTypeVideo];

//Create a device input with the device and add it to thesession.

AVCaptureDeviceInput *videoInput=[AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error];

//Setup the video output

_videoOutput =[[AVCaptureVideoDataOutput alloc] init];

_videoOutput.alwaysDiscardsLateVideoFrames = NO;

_videoOutput.videoSettings =

[NSDictionary dictionaryWithObject:

[NSNumber numberWithInt:kCVPixelFormatType_32BGRA] forKey:(id)kCVPixelBufferPixelFormatTypeKey];

//Create the session

_capSession =[[AVCaptureSession alloc] init];

[_capSession addInput:videoInput];

//[_capSessionaddInput:audioInput];

[_capSession addOutput:_videoOutput];

//[_capSessionaddOutput:_audioOutput];

_capSession.sessionPreset = AVCaptureSessionPresetLow;

//Setup the queue

dispatch_queue_t queue= dispatch_queue_create("MyQueue", NULL);

[_videoOutput setSampleBufferDelegate:self queue:queue];

[_audioOutput setSampleBufferDelegate:self queue:queue];

dispatch_release(queue);

[_capSession startRunning];

通过AVCaptureVideoDataOutputSampleBufferDelegate代理 取得摄像头数据

#pragma mark AVCaptureSession delegate

-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer

fromConnection:(AVCaptureConnection *)connection

{

NSData *data=[NSData dataWithBytes:&sampleBuffer length:malloc_size(sampleBuffer)];

[self recieveVideoFromData:data];

}

收到数据后转换成图像

-(void)recieveVideoFromData:(NSData *)data{

CMSampleBufferRef sampleBuffer;

[data getBytes:&sampleBuffer length:sizeof(sampleBuffer)];

NSAutoreleasePool *pool =[[NSAutoreleasePool alloc] init];

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);

UIImage *image=[UIImage imageWithCGImage:newImage scale:1.0

orientation:UIImageOrientationRight];

CGImageRelease(newImage);

[self.imageView performSelectorOnMainThread:@selector(setImage:)

withObject:image waitUntilDone:YES];

CVPixelBufferUnlockBaseAddress(imageBuffer,0);

[pool drain];

}