[libdc1394-devel] simultaneous hardware triggered format 7 capture

[Gurganus, B. L <gur...@ro...>]

In my work, I am working with a setup that consists of three cameras in
an IEEE1394 chain with a hardware triggering device (that only receives
power from IEEE1394 and communicates of normal serial). The Windows
software that comes with the cameras from PixeLink allows us to set up
the cameras to receive a hardware trigger and simultaneously capture
images from the three cameras with the maximum resolution of Format 7.0.
Currently, we are running into two primary issues. The first is that we
are getting No Bandwidth issues when we try to use Format 7.0. The
second is that DMA transmission does not seem to work as non-root.

Are DMA transmissions supposed to only run as root? If not, where do I
need to check permissions. The software this is in previously used
version 1 of libdc1394 and it appears to run as root. However, if there
is no reason for it to be running as root, I want to fix the permissions
issue that is preventing it from running as non root.

Second, considering that we cannot seem to get simultaneous Format 7.0
capture using hardware trigger to work in Coriander, it is looking like
this is a bug somewhere between libdc1394 and the kernel. However, we
may be using the API wrong and/or Coriander wrong. Could I get an idea
of how to do the simultaneous hardware triggered image capture and an
idea of how to simulate what we want in Coriander if this is not a bug
to this list's knowledge. If this is a bug, please let me know what
information I can provide to find and fix the bug or an idea of where to
look in the protocol stack to further diagnose where the problem is and
fix it.