[Bug 741263] videodecoder: implement caps query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741263
  GStreamer | gst-plugins-base | unspecified

--- Comment #11 from Thiago Sousa Santos <thiagossantos at gmail.com> 2014-12-15 21:58:13 UTC ---
Created an attachment (id=292776)
 View: https://bugzilla.gnome.org/attachment.cgi?id=292776
 Review: https://bugzilla.gnome.org/review?bug=741263&attachment=292776

videodecoder: implement accept caps query to handle image caps without
framerate

decoders that use image/* caps shouldn't care about framerate and would
be able to accept a caps even when no framerate is specified. Due to the
accept caps query use of subset caps comparison a caps missing a framerate
would not be accepted.

This patch adds special handling to ignore the framerate field in accept
caps subset checks

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