> > 1. I've read somewhere (but I can't find it again to ref it, sorry) that
> > kernel drivers should not
> > encode data, to avoid over complicating them. Is this still true?
>
> I'd say the decompression should be handled by the driver as this isn't
> something generic. Converting one format into another should not be
> done by the driver, althrouth in that case some applications might fail
> because the hardware supports yuv data only.
>
I guess I will just have to decompress into YUV 4:2:2 packed. All I have to do is work
out
how to convert YUV 4:2:2 interleaved into YUV 4:2:2 packed.
> > 3. xawtv determines that my video card supports data in various formats:
> >
> > This is xawtv-3.36, running on Linux/i686 (2.4.1)
> > image format list for port 39
> > 0x32595559 (YUY2) packed
> > 0x32315659 (YV12) planar
> > 0x30323449 (I420) planar
> > 0x59565955 (UYVY) packed
> > Xv: using port 39 for hw scaling
> >
> > The driver spits out YUV 4:2:2 interleaved format or YUV 4:2:0 Planar
> > format. Outputing raw YUV 4:2:2 format with no
> > the video card quite happily displays images (although they are a bit
> > blue baised). YUV4:2:0 doesn't work
> > at all for me, yet!
>
> xawtv uses the 4:2:2 (packed) format only for display using Xv. It is
> easy to handle and tends to be supported by nearly any piece of hardware
> (both grabber and video card) out there.
>
> YUV 4:2:0 (planar) is used for jpeg compression. "streamer -o /tmp/x.jpeg"
> should use that for example (add -d to see some debug output).
>
> > 4. If the solution to (3) is encoding the data to stop the image being
> > too blue, where should the encoding be done -
> > in the driver, or the application?
>
> Huh? The hardware has no controls to adjust bright/contrast/hue/... ?
The hardware has controls to adjust everything and I've tried zero to 128 on everything
things still come out with a shade of blue. BTW. If xawtv expects 4:2:2 (packed) and
the
driver is only producing 4:2:2 interleaved this is probably why?
Thanks
Derek
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