[Bug 735660] Patch: fix new v4l2 code not working with certain devices

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=735660
  GStreamer | gst-plugins-good | 1.4.1

--- Comment #5 from Hans de Goede <jwrdegoede at fedoraproject.org> 2014-08-29 12:54:11 UTC ---
(In reply to comment #4)
> Review of attachment 284800 [details]:
> 
> If a driver refuse to free buffers when there is no buffers allocator, why
> would it work when there is 1 buffer ?

These drivers always refuse to free buffers, using count=0 to free buffer is an
extension to the V4L2 requestbufs ioctl which got added much later then the
introduction of the requestbufs ioctl itself. These drivers only free buffers
when the fd get closed.

> Also, if it already support freeing the
> 1 buffer, it can't be that hard to fix upstream driver to comply with the spec.

Fixing these drivers means moving them over to the videobuf2 internal
kernel-api, problem is that that API does not yet support cards capable of
hardware video overlays, which these cards are. This is not going to get fixed
anytime soon, and all userspace apps know how to deal with these cards. This
used to work in gstreamer too until the recent v4l2 support rework. This is a
regression in gstreamer which needs to be fixed in gstreamer.

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