Re: buggy v4l apps (was: VIDIOCSYNC and bad data)

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On Tue, 5 Aug 2003, Gerd Knorr wrote:

>gstreamer IMHO is overkill just for doing conversions.
>
>IMHO it would be better to put that into a small library which has
>just the conversion functions and nothing else.

I don't think so: in a generic plugin system, parts of the driver could be
moved into userspace plugins.

It's not just format conversion: there certainly is/will be hardware that
needs complex image processing and filtering for the incoming video, and
likely some features computed from the video image need to be fed back to
the driver to control the camera.

For example, I get mjpeg-compressed video from the camera that I need to
uncompress and compute the image brightness. The brightness then controls
the camera exposure time. Another example: automatic focus control.

Besides, users have asked me to implement things like flipping image upside
down in the driver, because they have mounted the camera into ceiling or
something. With a proper plugin system, this should be possible with all
video applications by just editing ~/.gstreamer.conf or something to tell
the pipeline that "insert somewhere a flip plugin".

So I think that a big complex plugin system is needed, hopefully
Gstreamer.




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