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-decodebin:
-
-  A bin with a sinkpad that decodes the data into raw formats. It works by sending
-  the input data through a typefind element and then recursively autoplugs elements 
-  from the registry until a raw format is obtained. It will then create a new ghostpad
-  on itself to signal the app of the new pad. 
-
-  Decodebin will also remove pads when they are removed from the stream.
-
-  TODO
-   - reuse of decoderbin, cleanup in READY state
-   - threading after demuxing?
-   - new_media events should be handled.
-   - caching of elements.
-   - abstract more elements, pads (typefind, ...);
-
-   The autoplugging happens as follows:
-
-   1) typefind is added internally to the bin.
-   2) the have_type signal is connected to typefind.
-   3) in the have_type callback the close_pad_link function is called
-   4) close_pad_link checks the type on the pad, if it is raw, a ghostpad
-      is created and autoplugging for that pad stops.
-   5) if the type of the pad is not raw, a list of possible elements that
-      can connect to this type is generated in find_compatibles.
-   6) try_to_link_1 with the element list is called. The function will loop
-      over the element list and will try to connect one of the elements to
-      the pad. If the link works, a call is made to close_link.
-   7) close_link loops over all the source pads of the element and 
-      recursively calls 4) for any ALWAYS pad. For elements with
-      a SOMETIMES pad, a structure is set up and is passed to the callback
-      of the new_pad signal.
-   8) in the new_pad callback, 4) is called to try to autoplug the
-      new pad.
-
-
-playbasebin:
-
-  A bin with an uri property. It will find the right source element from the registry
-  and connect a decoderbin to it. When going to the PAUSED state, it will iterate the
-  decoderbin and listen for new pad signals from it. It will connect a queue to each
-  new pad and will iterate the decoderbin until one of the queues is filled. It is
-  assumed that by that time all the streams will be found so that when leaving the
-  PAUSED state, one can query the number of streams in the media file with the given
-  uri.
-
-  Playbasebin internally groups related streams together in a GstPlayBaseGroup. This
-  is particulary important for chained oggs. Initially, a new group is created in 
-  the 'building' state. All new streams will be added to the building group until
-  no-more-pads is signaled or one of the preroll queues overflows. When this happens,
-  the group is commited to a list of groups ready for playback. PlaybaseBin will then
-  attach a padprobe to each stream to figure out when it finished. It will remove
-  the current group and install the next playable group, then.
-
-  Before going to the PLAYING state, it is possible to connect a custom element to
-  each of the streams. To do that, you have to add the element to the bin and then
-  connect the pad(s) from the stream(s). You do not have to add the elements in
-  a thread, the bin will take care of then when it's needed. You are allowed to use
-  threads inside the elements, of course.
-  The bin tries to be smart and doesn't add a queue when there is only one possible 
-  stream.
-
-  
-  TODO
-  - reuse, cleanup in ready state
-  - when the first pad is closed, it's possible that another dynamic element is
-    added somewhere so that we need a queue for the first pad as well.
-
-
-playbin:
-  
-   Extends playbasebin, sets up default audiosink and videosink for first audio/video
-   stream detected. implements seeking and querying on the configured sinks.
-
-   It also waits for new notifications from playbasebin about any new groups that are
-   becomming active. It then disconnects the sinks and reconnects them to the new
-   pads in the group.
-
-   TODO
-   - reuse, refcounting, cleanup in READY state
-   - be smarter about replugging the sinks instead of removing them and readding them.
-   - Do not crap out when the audio device is in use.
-
-
-general
-
-   TODO
-   - playlist support. maybe use a playlist bin that streams the contents of the
-     playlist on a pad, interleaved with new_media events. Also add a tuner 
-     interface while we're at it.
-