[Gta04-owner] Camera scaling down to VGA

Benjamin Deering ben_deering at swissmail.org
Sat Jun 8 21:03:54 CEST 2013


> I do not understand yet, what is going on, I tried capturing images with
> this:
> http://misc.andi.de1.cc/capture-vga.c
>
> and then
> convert UYVY:name name.jpg
> with the resulting captures. They look synced. Maybe mplayer is not fast
> enough with collecting data? I still get nearly 100% cpu load.


This is from a message I sent to the gta04-community forum a few weeks 
ago.  This synced up:

I spent some time with the camera-demo script and I think I found out 
something useful.  If I bypass the omap ISP preview pad, the resizer works:
media-ctl -r
media-ctl -v -l '"ov9655 2-0030":0->"OMAP3 ISP CCDC":0[1]'
media-ctl -v -l '"OMAP3 ISP CCDC":1->"OMAP3 ISP resizer":0[1]'
media-ctl -v -l '"OMAP3 ISP resizer":1->"OMAP3 ISP resizer output":0[1]'
media-ctl -v -V '"ov9655 2-0030":0 [UYVY2X8 1280x1024]'
media-ctl -v -V '"OMAP3 ISP CCDC":1 [UYVY2X8 1280x1024]'
media-ctl -v -V '"OMAP3 ISP resizer":0 [UYVY 1280x1024]'
media-ctl -v -V '"OMAP3 ISP resizer":1 [UYVY 320x256]'
mplayer -v tv:// -vf rotate=2,swapuv -tv driver=v4l2:device=$(media-ctl 
-e "OMAP3 ISP resizer output"):outfmt=uyvy:width=320:height=256 -vo x11

This discussion http://www.spinics.net/lists/linux-media/msg40786.html 
and a few other places make it look like omap3isp does some automatic 
cropping and links that use the cropped data need to know to what size 
it was cropped.

for vga output, I used:
media-ctl -v -V '"OMAP3 ISP resizer":1 [UYVY 640x475]'
mplayer -v tv:// -vf rotate=2,swapuv -tv driver=v4l2:device=$(media-ctl 
-e "OMAP3 ISP resizer output"):outfmt=uyvy:width=640:height=475 -vo x11

and for sxga I used:
media-ctl -v -V '"OMAP3 ISP resizer":1 [UYVY 1280x1014]'
mplayer -v tv:// -vf rotate=2,swapuv -tv driver=v4l2:device=$(media-ctl 
-e "OMAP3 ISP resizer output"):outfmt=uyvy:width=1280:height=1014 -vo x11


It is a pretty small finding, but maybe it will give someone else an idea.





Ben


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