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如何在Swift中使用"CFRetain(sampleBuffer)"和"CFRelease(sampleBuffer)"？ CFRetain is unavailable: Core Foundation objectes are automatically memory managed.

 - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection 
{

    [self appendVideoSampleBuffer:sampleBuffer];

}

- (void)appendVideoSampleBuffer:(CMSampleBufferRef)sampleBuffer
{
    dispatch_async( _writingQueue, ^{

        CFRetain(sampleBuffer);
        [_videoInput appendSampleBuffer:sampleBuffer];
        CFRelease(sampleBuffer);

    });
}

如果需要在此方法范围之外引用CMSampleBuffer对象,则必须CFRetain它,然后在完成后再发送它.(Apple文件)