This is the frontends common part of remote control implementation. It handle the creation
of WebRTC session, and management of inputs. For now the reception use freedesktop.org
Desktop portal, and works mostly with Wayland based Desktop Environments.
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This is a series of changes necessary to prepare the implementation of remote control
feature:
- XEP-0166: add a `priority` attribute to `ApplicationData`: this is needed when several
applications are working in a same session, to know which one must be handled first.
Will be used to make Remote Control have precedence over Call content.
- XEP-0166: `_call_plugins` is now async and is not used with `DeferredList` anymore: the
benefit to have methods called in parallels is very low, and it cause a lot of trouble
as we can't predict order. Methods are now called sequentially so workflow can be
predicted.
- XEP-0167: fix `senders` XMPP attribute <=> SDP mapping
- XEP-0234: preflight acceptance key is now `pre-accepted` instead of `file-accepted`, so
the same key can be used with other jingle applications.
- XEP-0167, XEP-0343: move some method to XEP-0167
- XEP-0353: use new `priority` feature to call preflight methods of applications according
to it.
- frontend (webrtc): refactor the sources/sink handling with a more flexible mechanism
based on Pydantic models. It is now possible to have has many Data Channel as necessary,
to have them in addition to A/V streams, to specify manually GStreamer sources and
sinks, etc.
- frontend (webrtc): rework of the pipeline to reduce latency.
- frontend: new `portal_desktop` method. Screenshare portal handling has been moved there,
and RemoteDesktop portal has been added.
- frontend (webrtc): fix `extract_ufrag_pwd` method.
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- file send/receive commands now supports webRTC transfer. In `send` command, the
`--webrtc` flags is currenty used to activate it.
- WebRTC related code have been factorized and moved to `libervia.frontends.tools.webrtc*`
modules.
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- the `merge_pip` option is now used to indicate if local feedback and remote video
streams must be merged with local feedback being a PiP of remote video. By default, it's
done for `SINKS_AUTO`, but it can be manually specified to use it with `SINKS_APP` or to
split ``SINKS_AUTO`` in 2 windows.
- target size of the compositor used with `merge_pip` can be specified. By default, 720p
is used.
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- Freedesktop Desktop Screenshare port is now used when Wayland is detected (needs
`xdg-desktop-portal` with the implementation corresponding to desktop environment).
- Add a binding feature to feedback state to application (e.g. if desktop sharing is
cancelled from desktop environment, or at portal's permission request level).
- fix misnaming of video source (was wrongly named `camera` instead of `video`).
- fix desktop sharing pad selection in `input-selector` when it has been added once, then
removed, then added again.
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this is a factored implementation usable by all non-web frontends. Sources and Sinks can
be configured easily to use tests source or local webcam/microphone, autosinks or a
`appsink` that the frontend will use.
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- `run_from_thread` can be used to run a method from a thread.
- `maybe_async` can be used to run a method if we are not sure if it's async or not.
- `install_glib_asyncio_iteration` run the GLib loop from asyncio one's.
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