CMSampleBufferRef转换为UIImage

- (UIImage *)imageFromSampleBuffer:(CMSampleBufferRef)sampleBuffer {
    
    CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
    CIImage *ciImage = [CIImage imageWithCVPixelBuffer:imageBuffer];
    CIContext *temporaryContext = [CIContext contextWithOptions:nil];
    CGImageRef videoImage = [temporaryContext createCGImage:ciImage fromRect:CGRectMake(0, 0, CVPixelBufferGetWidth(imageBuffer), CVPixelBufferGetHeight(imageBuffer))];
    
    UIImage *image = [[UIImage alloc] initWithCGImage:videoImage];
    CGImageRelease(videoImage);
    
    return image;
}

参考文章：https://www.jianshu.com/p/4b4d44c6be1d

https://zhuanlan.zhihu.com/p/24762605