[Bug 704950] New: Adding colorspace conversion in videomixer.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704950
  GStreamer | gst-plugins-good | git

           Summary: Adding colorspace conversion in videomixer.
    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: mathieu.duponchelle at epitech.eu
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Right now videomixer isn't supposed to accept different formats on its
sinkpads, and also goes in an infinite loop when trying to do so.

The first patch copies videoconvert's code and packs it with videomixer,
renaming some symbols in the process to avoid conflict.

Worth to note is that the ORC_SOURCE directive doesn't allow to specify
multiple source files, so I worked around that by concatenating blendorc.orc
and gstvideoconvertorc.orc together in gstvideomixerorc.orc. The correct fix
would be to fix ORC_SOURCE but I don't know my autotools very well.

The second patch implements colorspace conversion and modifies the
_sink_setcaps function of videomixer.

What's left to do ?

Reconfigure the conversions and the srcpad when pads are released and we can
switch to a "less-converting" option or when pads are added with an alpha and
the old caps of the srcpad didn't have alpha.

I'll attach new patches when this is done but I believe this can be reviewed
already.

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