has weston a rtsp video src support?

[Pekka Paalanen]

On Wed, 24 Jul 2019 14:02:43 +1200
Barry Song <21cnbao at gmail.com> wrote:

> Hi Esaki,
> 
> Esaki Tomohito <etom at igel.co.jp> 于2019年7月24日周三 下午1:44写道：
> >
> > Hello Barry,
> >
> > The remoting plugin doesn't support mirroring.
> > If the recently merged pipewire plugin doesn't support mirroring,
> > I think that weston doesn't support remote mirroring.
> >  
> 
> thanks for your reply. it seems pipewire is a good plugin which can
> move gstreamer pipeline out of weston.  so it makes remote-plugin more
> flexible.
> but it is probably another extended screen rather than mirroring.
> 
> I am wondering if it is possible to make the "same-as" clone-mode
> support remote screen as well:
> https://lists.freedesktop.org/archives/wayland-devel/2018-April/037946.html
> 
> since remote screen has no real crtc, it should be able to simulate a
> sharing-crtc scenerios which "same-as" clone-mode depends on?

Hi,

not the "same-as" directive specifically, because it is reserved
for shared-CRTC cloning where the main feature is that the cloned
outputs' timings are guaranteed to be synchronized in hardware.

We need a new directive, "clone-of", or whatever, to denote
independent outputs (meaning independent timings, pixel format,
etc.) scanning out the same area of the desktop.

The reason why that still has not been implemented is libweston's
damage tracking framework. It needs to be re-designed, because
currently it simply cannot have overlapping outputs - damage would
be cleared too early when just the random first output repaints,
leaving other overlapping outputs showing randomly old content.

Another way could be to use the vaapi-recorder code paths and feed
that video stream to a transmitter - or to pipewire, if the buffer
reservation/release convetions allow (a real DRM output probably
has only few buffers available, so the transmitter cannot keep a
hold of very many at the same time). Another disadvantage is that
the buffer domain, pixel format and modifier must be scanout-able,
which may not be optimal or suitable for e.g. hardware video
encoders. However, vaapi-recorder works, so it can obviously work
at least on Intel.


Thanks,
pq
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