What is polling (non-blocking) capturing?
Polling applies only to the the dequeueing of DMA capture buffers via dc1394_capture_dequeue_dma(); it is an argument of that function. If you set the dc1394video_policy_t argument of this function to DC1394_VIDEO1394_POLL the function will not wait for frames if the DMA ring buffer is empty. It will return immediately either with the first frame waiting in the DMA ring buffer or with a NULL pointer if no frame is present.
