问题描述
我正在玩苹果网站(Xcode项目)上的AVScreenShack示例，该示例捕获桌面并将捕获的内容实时显示在窗口中.
I'm playing around with the AVScreenShack example from Apple's website (Xcode project) which captures the desktop and displays the capture in a window in quasi real-time.
我对项目做了一些修改，并插入了以下代码行:
I have modified the project a little bit and inserted this line of code:
-(void)captureOutput:(AVCaptureOutput*) captureOutput didOutputSampleBuffer:(CMSampleBufferRef) sampleBuffer fromConnection:(AVCaptureConnection*) connection
{
...
}
我的问题是:如何将CMSampleBufferRef实例转换为CGImageRef?
My question is : How do I convert the CMSampleBufferRef instance to CGImageRef ?
谢谢.
推荐答案
这里是如何从CMSampleBufferRef创建UIImage的方法.当在AVCaptureStillImageOutput上响应captureStillImageAsynchronouslyFromConnection:completionHandler:时，这对我有用.
Here is how you can create a UIImage from a CMSampleBufferRef. This worked for me when responding to captureStillImageAsynchronouslyFromConnection:completionHandler: on AVCaptureStillImageOutput.
// CMSampleBufferRef imageDataSampleBuffer;
CMBlockBufferRef buff = CMSampleBufferGetDataBuffer(imageDataSampleBuffer);
size_t len = CMBlockBufferGetDataLength(buff);
char * data = NULL;
CMBlockBufferGetDataPointer(buff, 0, NULL, &len, &data);
NSData * d = [[NSData alloc] initWithBytes:data length:len];
UIImage * img = [[UIImage alloc] initWithData:d];
CMBlockBufferGetDataPointer发出的数据似乎是JPEG数据.
It looks like the data coming out of CMBlockBufferGetDataPointer is JPEG data.
更新:要完全回答您的问题，您可以从我的代码中调用img上的CGImage来实际获得CGImageRef.
UPDATE: To fully answer your question, you can call CGImage on img from my code to actually get a CGImageRef.
这篇关于CMSampleBufferRef到位图?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！