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where copy_DV_frame() reads or writes on the dv1394 file descriptor
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(read/write mode) or copies data to/from the mmap ringbuffer and
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then calls ioctl(DV1394_SUBMIT_FRAMES) to notify dv1394 that new
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reset_dv1394() is called in the event of a buffer
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underflow/overflow or a halt in the DV stream (e.g. due to a 1394