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89 lines
2.6 KiB
Text
89 lines
2.6 KiB
Text
$Id$
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Currently its only save to link/unlink elements/pad when pipeline is in READY.
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Belowe some thoughts. See http://bugzilla.gnome.org/show_bug.cgi?id=435487
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for patches.
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= current api =
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gboolean gst_element_link (GstElement *src, GstElement *dest);
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void gst_element_unlink (GstElement *src, GstElement *dest);
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gst_element_link_many, gst_element_unlink_many, gst_element_link_filtered,
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gst_element_link_pads, gst_element_unlink_pads, gst_element_link_pads_filtered
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GstPadLinkReturn gst_pad_link (GstPad *srcpad, GstPad *sinkpad);
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gboolean gst_pad_unlink (GstPad *srcpad, GstPad *sinkpad);
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= use cases =
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== inserting an element ==
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* we have: e1 ! e4
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* we want: e1 ! e2 ! e3 ! e4
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* we want: e1 ! e2 ! e4
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gst_element_insert_linked(e1, e2, e3, e4); // e2 == e3 allowed
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gst_pads_insert_link (e1.src, e2.sink, e3.src, e4.sink);
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disconnect e1.src, e1.src.peer
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disconnect e4.sink, e4.sink.peer
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connect e1.src, e2.sink
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connect e3.src, e4.sink
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== removing an element ==
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* we have: e1 ! e2 ! e3
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* we want: e1 ! e3
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gst_element_remove_linked(e2);
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gst_pads_remove_link (e1.src, e3.sink);
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disconnect e1.src, e1.src.peer
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disconnect e3.sink, e3.sink.peer
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connect e1.src, e3.sink
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== swapping out an elelment ==
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* we have: e1 ! e2 ! e6
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* we have: e1 ! e2 ! e3 ! e6
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* we want: e1 ! e4 ! e5 ! e6
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* we want: e1 ! e3 ! e6
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gst_element_swap_linked(e1, e4, e5, e6);
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gst_pads_insert_link (e1.src, e4.sink, e5.src, e6.sink);
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disconnect e1.src, e1.src.peer (=e2.sink)
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disconnect e6.sink, e6.sink.peer
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connect e1.src, e4.sink
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connect e5.src, e6.sink
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= thoughts =
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* I don't think we need api for pads
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* Should current api check for the state?
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* do we want to swapp multiple elements at once
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== events ==
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* tee and adder need special treatment
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* both would need to cache an accumulated segment
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* tee
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* would also cache tags
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* when linkfunc is called, it can send out the segment and the tags
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* when all pads got unlinked it could clear the segment
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* adder
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* when linkfunc gets called it sends a seek-event
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= ideas =
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== dynlinkpoint ==
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* use cases
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* its meant to be used with one side disconnected to allow to connect elements
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at runtime
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* it can be used in a pipeline to remove/insert elements at runtime
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* element with 1 source- and 1 sinkpad
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* when both connected it passes data thru
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* if src is not connected it drops received buffers
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* if sink is not connected
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* it does not push
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* it creates silence on pull
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* events
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* it caches events
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* down: newsegment, tags, buffersize
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* up: seek (needs to be modified)
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* when other-pad get connected it pushes events depending on direction
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