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Marius Vlad ca52c79c51 remoting-plugin: Check virtual outputs/remoting instance 
With commit aab722bb, "backend-drm: prepare virtual output API for
heterogeneous outputs", we now call the virtual destroy function,
but when shutting the compositor we no longer have a remoting instance
available.

When searching out for a remoting output verify if the remoting instance is
still available before attempting to search for a remoting output.

Addresses the following crash at shutdown:

0x00007fd430a1d347 in lookup_remoted_output (output=0x557163d5dad0) at ../remoting/remoting-plugin.c:515
0x00007fd430a1d746 in remoting_output_destroy (output=0x557163d5dad0) at ../remoting/remoting-plugin.c:635
0x00007fd439e11ab9 in drm_virtual_output_destroy (base=0x557163d5dad0) at ../libweston/backend-drm/drm-virtual.c:265
0x00007fd43a8635d0 in weston_compositor_shutdown (ec=0x557163239530) at ../libweston/compositor.c:8271
0x00007fd439e029d4 in drm_destroy (backend=0x557163240ae0) at ../libweston/backend-drm/drm.c:2713
0x00007fd43a863e07 in weston_compositor_destroy (compositor=0x557163239530) at ../libweston/compositor.c:8626

Includes a note to point up what should be done about by
checking out https://gitlab.freedesktop.org/wayland/weston/-/issues/591.

Fixes aab722bb "backend-drm: prepare virtual output API for
heterogeneous outputs"

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
 		2023-02-20 12:41:03 +02:00
..
README doc: Move helper scripts to doc/scripts 2019-06-25 14:05:54 +00:00
meson.build plug-ins: Migrate pipewire and remoting plug-ins headers to public header 2020-09-04 10:36:48 +00:00
remoting-plugin.c remoting-plugin: Check virtual outputs/remoting instance 2023-02-20 12:41:03 +02:00

README 

	Remoting plugin for Weston


The Remoting plugin creates a streaming image of a virtual output and transmits
it to a remote host. It is currently only supported on the drm-backend. Virtual
outputs are created and configured by adding a remote-output section to
weston.ini. See man weston-drm(7) for configuration details. This plugin is
loaded automatically if any remote-output sections are present.

This plugin sends motion jpeg images to a client via RTP using gstreamer, and
so requires gstreamer-1.0. This plugin starts sending images immediately when
weston is run, and keeps sending them until weston shuts down. The image stream
can be received by any appropriately configured RTP client, but a sample
gstreamer RTP client script can be found at doc/scripts/remoting-client-receive.bash.

Script usage:
	remoting-client-receive.bash <PORT NUMBER>


How to compile
---------------
Set --enable-remoting=true when configuring weston. The remoting-plugin.so
module is created and installed in the libweston path.


How to configure weston.ini
----------------------------
See man weston-drm(7).