What is non-polling (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_WAIT the function will wait for frames if the DMA ring buffer is empty. If a frame is not yet available (because the camera is waiting for an external trigger or if the frame rate is slow or if the latest frame is still being transmitted from the camera to the computer) then the blocking capture functions wait (block) until a frame is ready. There is no easy way to unblock this function other than stopping capture.
