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Bug 725410 - v4l2videodec: Probe fails if first device does not start with 0
v4l2videodec: Probe fails if first device does not start with 0
Status: RESOLVED FIXED
Product: GStreamer
Classification: Platform
Component: gst-plugins-good
git master
Other Linux
: Normal normal
: 1.3.2
Assigned To: GStreamer Maintainers
GStreamer Maintainers
Depends on:
Blocks:
 
 
Reported: 2014-02-28 17:35 UTC by Nicolas Dufresne (ndufresne)
Modified: 2014-05-08 20:21 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description Nicolas Dufresne (ndufresne) 2014-02-28 17:35:51 UTC 
Currently, v4l2videodec probe for HW decoder by iterating /dev/videoN, starting as zero. If /dev/video0 does not exist, it fails to find a decoder. This seems like the wrong way to enumerate the devices, still need to find the right way, if anyone have information. Is using udev might be an option ?
Comment 1 Nicolas Dufresne (ndufresne) 2014-02-28 18:02:48 UTC 
After looking at v4l2 utils, it seems that a good way would be to enumerate /sys/class/video4linux/video* . I think it could be nice to improve the element naming (ensure that decoder name does not change) by using /sys/class/video4linux/video*/name. I need to check if that is unique, and characters being used.
Comment 2 Nicolas Dufresne (ndufresne) 2014-05-08 20:21:12 UTC 
This was fixed by:

commit aa74871080d93701523e8bc183b2a8432e9b61c5
Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
Date:   Fri May 2 21:38:30 2014 -0400

    v4l2: Use single pass iterator for M2M probe
    
    Instead of having each M2M class do their own probing, use the
    GstV4l2Iterator and probe all devices in a single pass.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=727925

commit 726fc3b5249274d9a56dcd3c7dc45e48c52b912d
Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Date:   Fri May 2 16:55:05 2014 -0400

    v4l2: Add a common device enumerator
    
    This will allow removing code duplication (hence bugs duplication).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=727925