query/set parameters/controls from GST pipeline

[Nicolas Dufresne]

Hey,

Le mar. 5 mars 2024, 15 h 27, Joel Winarske <joel.winarske at gmail.com> a
écrit :

>
> > I can assist with building a cpp tool that transforms
>> src/libcamera/control_ids.yaml into src/gstreamer/gstlibcamera-controls*.
>>
>> That would be more then welcome !
>>
>
> Cool.  I'll start looking into it.
>
>
>> This is a different approach from the upstream pipewire approach. It will
>> certainly yield higher latency, but then you got a more usable buffer
>> lifetime
>> policy. Let us know the outcome for the "node control", this is still an
>> open
>> question in regard to the in-pipewire libcamerasrc node. There was also
>> open
>> questions upon if a node control can cause the number of ports to
>> dynamically
>> change.
>>
>
> This approach came from George (WirePlumber); context is complex Camera
> graphs.  What upstream approach are you referring to?
>

There is a spa plug-in that can provide cameras in the same way audio
device are made available.

>
https://gitlab.freedesktop.org/pipewire/pipewire/-/tree/master/spa/plugins/libcamera?ref_type=heads

Most of my discussions so far with upstream devs has been around this
implementation. It implements a slightly broken buffer lifetime policy and
is missing the ability to configure more ports.

Having a daemon like bluez could also be an option, that is open for
research.

regards,
Nicolas
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