mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-30 05:31:15 +00:00
38 lines
1.7 KiB
Text
38 lines
1.7 KiB
Text
|
|
The autoplugger is a custom bin with a set of custom add/remove methods.
|
|
The point is to virtually add a set of plugins that should take part in
|
|
the autoplugging (like the src, sink elements). The autoplugger should
|
|
try hard to included these plugins in the final pipeline.
|
|
|
|
The autoplugger has to be a bin because else we cannot put it into the
|
|
paused state when dynamically connecting elements.
|
|
|
|
We cannot include the intermediate elements or sink/src elements to the bin
|
|
right away because else they will be scheduled by the scheduler.
|
|
|
|
The bin will use the elementfactory klass field to get a basic idea about
|
|
the plugin:
|
|
|
|
- the 'Source' keyword is used to detect source elements
|
|
- the 'Sink' keyword is used to detect the sink elements or targets
|
|
of the autoplugging.
|
|
- other elements are considered intermediate elements and will be
|
|
inserted when possible.
|
|
|
|
|
|
algorithm:
|
|
|
|
- Autoplugging starts from a source element, it will be added to the real bin.
|
|
- for all unconnected pads:
|
|
- if pad has NULL padtemplate caps add typefind + autoplugcache to the pad
|
|
- if unconnected pad has fixed caps, find element in repository that can
|
|
connect.
|
|
- first check elements added to the bin
|
|
- test elements ordered by rank
|
|
- favour 'Demux' type elements close to sources, 'Decoder' elements after
|
|
that and 'Filter' elements close to sinks.
|
|
- link dummy element with pads with non-fixed caps. The dummy element getcaps
|
|
function will use the repository to return a list of compatible caps, so that
|
|
the element can choose freely. The dummy element is replaced with a real
|
|
element when caps become fixed.
|
|
- all new_pad signals and caps notifications trigger the above actions.
|