Implement lazy loading asset cache so gesdemux use the formatters
assets while GES hasn't been initialized.
And set extensions to temporary files as some formatters require
the information (otio)
Adding a property to let the application know
Also make sure that the duration of nested timeline assets is reported
as CLOCK_TIME_NONE as those are extended as necessary.
And make a difference between asset duration and their max duration
As nested timelines can be extended 'infinitely' those max duration
is GST_CLOCK_TIME_NONE, but their duration is the real duration of
the timeline.
When we have nested timelines, we need to make sure the underlying
formatted file is reloaded when commiting the main composition to
take into account the new timeline.
In other to make the implementation as simple as possible we make
sure that whenever the toplevel composition is commited, the decodebin
holding the gesdemux is torn down so that a new demuxer is created
with the new content of the timeline.
To do that a we do a NleCompositionQueryNeedsTearDown query to which
gesdemux answers leading to a full nlecomposition stack
deactivation/activation cycle.
First marshilling it to the main thread is dangerous as it is a blocking
operation and it should never happen there.
The asset cache is MT safe now so it is possible to load the timeline
from that thread directly
Making sure to have 1 GstDiscoverer per thread.
Use that new feature in gesdemux by loading the timeline directly from
the streaming thread. Modifying the timeline is not supported allowed
anyway.
/usr/bin/ld: .libs/libgstges_la-gesdemux.o: in function `ges_timeline_new_from_uri_from_main_thread':
./plugins/ges/gesdemux.c:279: undefined reference to `gst_discoverer_new'
/usr/bin/ld: ./plugins/ges/gesdemux.c:288: undefined reference to `gst_discoverer_start'
