> I asked because usbvideo module (library for kernel-mode V4L drivers)
> already supports this configuration. If you want you can just write a
> "minidriver" that uses usbvideo to do the grunt work.
>
> Get it at http://www.linux-usb.org/ibmcam/
The trouble is I dont know much about color conversions and kernel drivers.
And I dont understand much of what I read on the page you supplied. Maybe it
have to sink in before my brain understands it.
> > 320x240 JPEG is what I have now. But the chip seems to support YUV4:2:2
> > Packed/Planar and YUV4:2:0 Packed/Planar. Packed format is JPEG
> > compressed.
>
> The camera compresses it? Interesting. I do not think you should
> uncompress it in the driver. This may pose interesting questions.
Such as?
> > Image sizes that the camera seems to support is sub-QCIF (128x96), QCIF
> > (176x144), CIF (128x96), SIF (352x240), 320x240 and VGA (640x480). In VGA
> > it is only capable of 15 frames/s in the other formats it supports around
> > 30 frames/s.
> >
> > > c) Is decoder ready? What is the output format?
> >
> > My code fetches JPEG compressed image data from the camera. At least i
> > think it is. The registers on the Winbond chip is enabled for JPEG data.
> > I have not written any code to verify it yet.
>
> The issue is that V4L does not offer compressed video formats. The
> file <linux/videodev.h> defines those:
>
> #define VIDEO_PALETTE_GREY 1 /* Linear greyscale */
> #define VIDEO_PALETTE_HI240 2 /* High 240 cube (BT848) */
> #define VIDEO_PALETTE_RGB565 3 /* 565 16 bit RGB */
> #define VIDEO_PALETTE_RGB24 4 /* 24bit RGB */
> #define VIDEO_PALETTE_RGB32 5 /* 32bit RGB */
> #define VIDEO_PALETTE_RGB555 6 /* 555 15bit RGB */
> #define VIDEO_PALETTE_YUV422 7 /* YUV422 capture */
> #define VIDEO_PALETTE_YUYV 8
> #define VIDEO_PALETTE_UYVY 9 /* The great thing about standards
> is .. . */
> #define VIDEO_PALETTE_YUV420 10
> #define VIDEO_PALETTE_YUV411 11 /* YUV411 capture */
> #define VIDEO_PALETTE_RAW 12 /* RAW capture (BT848) */
> #define VIDEO_PALETTE_YUV422P 13 /* YUV 4:2:2 Planar */
> #define VIDEO_PALETTE_YUV411P 14 /* YUV 4:1:1 Planar */
> #define VIDEO_PALETTE_YUV420P 15 /* YUV 4:2:0 Planar */
> #define VIDEO_PALETTE_YUV410P 16 /* YUV 4:1:0 Planar */
>
> Compressed video will not work with existing V4L clients. You'd
> need to decompress it into something.
Because the cam-chip supports type 13 and 15 here, besides JPEG compressed, I
guess the compression problem is solved.
I will try to decode the JPEG stream into some real images, to verify that I
get some kind of "real" data on the iso-pipe.
Maybe then I can try to fetch uncompressed data also. Do you have the
knowledge to decode a frame if I hand you some raw data?
/Stefan
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