[Bug 742918] New: v4l2: Add generic v4l2convert element

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742918
  GStreamer | gst-plugins-good | unspecified

           Summary: v4l2: Add generic v4l2convert element
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ejo at pengutronix.de
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=294529)
 View: https://bugzilla.gnome.org/attachment.cgi?id=294529
 Review: https://bugzilla.gnome.org/review?bug=742918&attachment=294529

generic converter patch

Instead of only creating device-specific convert elements as subclasses
of GstV4l2Transform, allow instantiating former abstract base class
GstV4l2Transform directly as a generic convert element.
The specific device can be passed using the 'device' property.

For this purpose the base classes 'device' property was given the read/write
flag and device-specific subclasses overwrite this property with a
read-only 'device' property set to the respecitve device path.

This eases constructing pipelines in scripts and allows to use
fixed '/dev/video/by-name/..' device paths.

Example usage:
gst-launch [..] ! v4l2convert device=/dev/video1 ! [..]

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