parse: handle H.263+ custom pixel aspect ratio
parse: handle H.263+ custom pixel aspect ratio

H.263+ can send any pixel aspect ratio, parse them and put them in the
caps.

Refactored by Felipe Contreras.

Signed-off-by: Olivier Crête <86e32882ba3951d68bd2d06702dd09a9d6fd15fe@collabora.co.uk>
Signed-off-by: Felipe Contreras <de77a8b9cd239b204c19c52ed62e48ab47243362@nokia.com>

community-ssu/gst-dsp,community-ssu/gst-dsp,felipec/gst-dsp,community-ssu/gst-dsp,felipec/gst-dsp