CMSampleBufferRef

CMSampleBufferRef转换为data数据

- (NSData *)bufferToData:(CMSampleBufferRef)source

{

CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(source);

CVPixelBufferLockBaseAddress(imageBuffer,0);

size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);

//    size_t width = CVPixelBufferGetWidth(imageBuffer);

size_t height = CVPixelBufferGetHeight(imageBuffer);

void *src_buff = CVPixelBufferGetBaseAddress(imageBuffer);

NSData *data = [NSData dataWithBytes:src_buff length:bytesPerRow * height];

CVPixelBufferUnlockBaseAddress(imageBuffer, 0);

return data;

}

CMSampleBufferRef转换为image

- (NSData *)bufferToData:(CMSampleBufferRef)source

{

CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(source);

CVPixelBufferLockBaseAddress(imageBuffer,0);

size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);

//    size_t width = CVPixelBufferGetWidth(imageBuffer);

size_t height = CVPixelBufferGetHeight(imageBuffer);

void *src_buff = CVPixelBufferGetBaseAddress(imageBuffer);

NSData *data = [NSData dataWithBytes:src_buff length:bytesPerRow * height];

CVPixelBufferUnlockBaseAddress(imageBuffer, 0);

return data;

}

// 通过抽样缓存数据创建一个UIImage对象

- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer

{

// 为媒体数据设置一个CMSampleBuffer的Core Video图像缓存对象

CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

// 锁定pixel buffer的基地址

CVPixelBufferLockBaseAddress(imageBuffer, 0);

// 得到pixel buffer的基地址

void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);

// 得到pixel buffer的行字节数

size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);

// 得到pixel buffer的宽和高

size_t width = CVPixelBufferGetWidth(imageBuffer);

size_t height = CVPixelBufferGetHeight(imageBuffer);

// 创建一个依赖于设备的RGB颜色空间

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

// 用抽样缓存的数据创建一个位图格式的图形上下文（graphics context）对象

CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,

bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);

// 根据这个位图context中的像素数据创建一个Quartz image对象

CGImageRef quartzImage = CGBitmapContextCreateImage(context);

// 解锁pixel buffer

CVPixelBufferUnlockBaseAddress(imageBuffer,0);

// 释放context和颜色空间

CGContextRelease(context);

CGColorSpaceRelease(colorSpace);

// 用Quartz image创建一个UIImage对象image

UIImage *image = [UIImage imageWithCGImage:quartzImage];

// 释放Quartz image对象

CGImageRelease(quartzImage);

return (image);

}