Re: [libdc1394-devel] threads and dc1394

[Jon S. <jon...@ho...>]

I don't specify a packet size.  I'm using video mode
DC1394_VIDEO_MODE_640x480_MONO8 and ISO speed 400.

On Thu, 2007-05-31 at 15:55 +0200, Mikael Olenfalk wrote:
> What packet size do you specify for your cameras?
> 
> /Mikael
> 
> On Thu, 2007-05-31 at 08:35 -0500, Jon Schewe wrote:
> > On Thu, 2007-05-31 at 10:57 +0900, Damien Douxchamps wrote:
> > > Hi Jon,
> > > 
> > > On Wed, 2007-05-30 at 14:15 -0500, Jon Schewe wrote:
> > > > I thought I saw something on this before, but couldn't find it in the
> > > > archives.  
> > > > 
> > > > Has anyone successfully used multiple threads to read data from dc1394
> > > > cameras?  My thought is to spawn a thread for each camera.  I've tried
> > > > doing all setup and enqueue/dequeue in a separate thread for each camera
> > > > and it fails on setup with 2 cameras.  It works ok with a single camera.
> > > 
> > > I know that it works because I use that in coriander. IIRC the simple
> > > precautions to take are:
> > > 
> > > - detect the cameras in the main program
> > > - setup capture in each thread
> > > - enqueue/dequeue in each thread
> > > - terminate capture in each thread
> > > 
> > > Which version of libdc are you using? Can you show us a sample program
> > > which produces the error? (BTW, which error?)
> > 
> > The difference I have is that setup is done in the main thread and
> > enqueue/dequeue/terminate are done in a different thread.  I just tried
> > changing it such that capture setup is done in the separate thread and
> > that doesn't work either.  Unplugging the second camera from the bus
> > allows the program to work.
> > 
> > I'm using the latest libdc from the source repository.  The error I get
> > is:
> > Error: camera is already streaming, aborting ISO channel allocation...
> >   Perhaps it is in use by another application or a previous session was
> >   not cleaned up properly.
> > Libdc1394 error (capture.c:dc1394_capture_setup:290): Generic failure :
> > Could not allocate ISO channel!
> > 
> > Unfortunately I don't have a short sample to send.
> > 
> > 
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> > 
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http://lug.htc.honeywell.com/people/jschewe [Honeywell Intranet Only]
Help Jen and I fight cancer by donating to the Leukemia & Lymphomia
Society
Here's our website: http://www.active.com/donate/tntmn/tntmnJSchewe
*My views may not represent those of my empoyers