[GEM-dev] [pix_video]: how to free the device?

[IOhannes m zmoelnig]

On 2010-05-19 01:33, Roman Haefeli wrote:
> On Mon, 2010-05-17 at 11:07 +0200, IOhannes m zmoelnig wrote:
> 
>> i have added open/close messages to [pix_video] now.
> 
> Thanks, but the situation is worse here with snv r3302. I still can

it only seems to be worse :-)
things are changing (not so) rapidly in this part of the code.

> access the USB camera and when I do so, the red light turns on. Also
> does the close message work (the red LED goes off and the pix becomes
> all white), but then I cannot access the camera anymore at all, even not
> with the same [pix_video], altough the camera indicates, that it is not
> busy. > 

the device is correctly opened. but streaming has not yet started.


> Neither switching devices nor using the 'open' message helps. When
> switching the device to 1 and back to 0 and I start rendering then, I
> get: 
> 
> GEM: Start rendering
> start: 1 -> 0
> v4l2: VIDIOC_REQBUFS: Device or resource busy
> 
> It seems like Pd is still keeping the file /dev/video0 open:
> 
> roman at yoyo2:~$ lsof | grep /dev/video0 
> pd         9419      roman  mem       CHR       81,0               12422 /dev/video0
> pd         9419      roman    6u      CHR       81,0      0t0      12422 /dev/video0
> 
> I have to quit Pd in order to regain access to the camera.

or just restart the rendering ([0, 1(->[gemwin])
or wait till it get's properly fixed....

> 
>> btw, fw-capture (with camcorders) is starting to work again (the old
>> backend was broken with the new juju stack on linux; if somebody wants
>> to try the new videoDV4L2 backend with the old stack and confirm that it
>> works, i will happily replace the old one...)
> 
> Oh, I hopefully be able to happily test that soon. 


and the IIDC backend (aks "for ieee1394 cameras readable by coriander")
gives me pictures as well :-) lots of work to do though

fgmasdr
IOhannes


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