Use poll() to wait for capture with timeout #58
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Before calling dc1394_capture_dequeue(), poll() for the frame to become available with a 500ms (arbitrary) timeout. Otherwise, constant polling has the undesirable effect of 100% CPU use. This makes up for dc1394_capture_dequeue() having no timeout option. It is the method suggested in libdc1394 faq (https://damien.douxchamps.net/ieee1394/libdc1394/faq/)
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Before calling
dc1394_capture_dequeue(),poll()for the frame to becomeavailable with a 500ms (arbitrary) timeout.
Fixes #48 (100% CPU use from constant polling), and is a different solution to #22.
It is the method "to cleanly stop a blocking capture" suggested in the libdc1394 FAQ which makes up for
dc1394_capture_dequeue()having no timeout option.