[Bug 719779] New: v4l2: Should not call VIDIOC_REQBUFS on _pool_set_config()

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719779
  GStreamer | gst-plugins-good | git

           Summary: v4l2: Should not call VIDIOC_REQBUFS on
                    _pool_set_config()
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Currently VIDIOC_REQBUFS is called each time the configuration of the buffer
pool is changed. The problem is that VIDIOC_REQBUFS do allocated on the kernel
size the required memory. Very often that memory is contiguous, which takes a
lot of time to allocate, and locks a lot of resources. To add to this problem,
certain driver don't allow calling this REQBUFS more then once, causing the
buffer pool to be rejected.

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