Question

如何将cfdataref nsdata转换为NSData

Answer 1

决方法;
/, height;/ Lock the base address of the pixel buffer
CVPixelBufferLockBaseAddress(imageBuffer;/ Create a bitmap graphics context with the sample buffer data
CGContextRef context = CGBitmapContextCreate(baseAddress, width; Works only if pixel format is kCVPixelFormatType_420YpCbCr8BiPlanarFullRange
- (UIImage *)convertSampleBufferToUIImageSampleBuffer:(CMSampleBufferRef)sampleBuffer{

/

// Create a Quartz image from the pixel data in the bitmap graphics context
CGImageRef quartzImage = CGBitmapContextCreateImage(context):quartzImage];

// Get a CMSampleBuffer;s Core Video image buffer for the media data
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
/ Free up the context and color space
CGContextRelease(context);
// Get the number of bytes per row for the plane pixel buffer
size_t bytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(imageBuffer,0); Create a device-dependent gray color space
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();

, colorSpace, 0);
size_t height = CVPixelBufferGetHeight(imageBuffer);

/:
pragma mark Convert SampleBuffer to UIImage
// Get the number of bytes per row for the plane pixel buffer
void *baseAddress = CVPixelBufferGetBaseAddressOfPlane(imageBuffer;

/, kCGImageAlphaNone), 8,
bytesPerRow;/ Release the Quartz image
CGImageRelease(quartzImage), 0); Unlock the pixel buffer
CVPixelBufferUnlockBaseAddress(imageBuffer,0); Create an image object from the Quartz image
UIImage *image = [UIImage imageWithCGImage;

//

// Get the pixel buffer width and height
size_t width = CVPixelBufferGetWidth(imageBuffer);
//
CGColorSpaceRelease(colorSpace)