iphone视频聊天代码实现

http://blog.csdn.net/zu12jing/article/details/6431745

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];//[AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeVideo];

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

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];

//[_capSession addInput:audioInput];

[_capSession addOutput:_videoOutput];

//[_capSession addOutput:_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];

}