无论如何在后台线程上有 captureOutput 回调？
无论如何，操作系统是否可以
- (void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)psampleBuffer fromConnection:(AVCaptureConnection *)pconnection
在后台线程而不是主线程上回调委托？问题是复制数据所需的时间会影响 UI。这似乎必须在主线程上完成，因为如果尝试在后台线程中复制 captureOutput 似乎会消失，等等......我在这里遗漏了一些东西吗？
CMFormatDescriptionRef format;
format = CMSampleBufferGetFormatDescription(sampleBuffer);
bufSize = CMSampleBufferGetNumSamples(sampleBuffer);
sampleSize = CMSampleBufferGetSampleSize(sampleBuffer,0);
sampleLength = CMSampleBufferGetTotalSampleSize(sampleBuffer);
blockbuff = CMSampleBufferGetDataBuffer(sampleBuffer);
CMBlockBufferCopyDataBytes(blockbuff, 0, tocopy*_depth, buffInUse+(offset*2));
Is there anyway to have the OS callback the delegate
- (void) captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)psampleBuffer fromConnection:(AVCaptureConnection *)pconnection
on a background thread instead of the main thread? The issue is the time that it is taking to copy off the data is affecting the UI. This seems to have to be done on the main thread since the captureOutput seems to be gone if trying to copy it in a background thread, etc... Am I missing something here?
CMFormatDescriptionRef format;
format = CMSampleBufferGetFormatDescription(sampleBuffer);
bufSize = CMSampleBufferGetNumSamples(sampleBuffer);
sampleSize = CMSampleBufferGetSampleSize(sampleBuffer,0);
sampleLength = CMSampleBufferGetTotalSampleSize(sampleBuffer);
blockbuff = CMSampleBufferGetDataBuffer(sampleBuffer);
CMBlockBufferCopyDataBytes(blockbuff, 0, tocopy*_depth, buffInUse+(offset*2));
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我使用 CVPixelBuffer 函数来锁定/解锁缓冲区并获取图像格式信息。我使用memcpy复制数据（当缓冲区被锁定时）并调用performSelectorInBackground来处理数据。
I use CVPixelBuffer functions to lock/unlock the buffer and get image format information. I use memcpy to copy the data (while the buffer is locked) and call performSelectorInBackground to process the data.
对于一个好的答案，这似乎获得修复回调线程的位置
只需要更改队列。
For a good answer, this seems to get the location to fix the callback thread
Just need to change the queue.