Re: [Linux-uvc-devel] Logitech Quickcam for Notebooks Pro

[Binary X. <bx...@gm...>]

On 1/31/06, Luc Saillard <lu...@sa...> wrote:
>
> On Tue, Jan 31, 2006 at 08:07:05AM -0800, Binary Xerroz wrote:
>
> > Well the jpeg_decoder function found in utils.h seems to be decoding to
> YUYV
> > (v4l format 411P shows an uglier picture than with format YUYV, so this
> is
> > based on this, even though in the function it says 411 encoding)
>
> I've not use the jpeg decoder in utils.c for some reasons:
>
> - GPL licence impcompatible with MPL (pwlib licence on which ekiga is
> based)
> - use integer precision for DCT (i prefer to use float, or others)
> - readability (i learn a lot in writing my own tools).
> - can convert directly in RGB24, YUV420P, Gray or only return some
>    components without decoding the full image.
> - ... because i like only my code :-)


haha me too :) except my knowledge on the subject is fairly limited, and
couldnt easily create my own (id still be scratching my head with an odd
look on my face ;)


> Also, <mplayer base dir>/postproc/, contains functions and libraries and
> > what not to convert YUYV streams into apparently many others.
>
> Yes ffmpeg (libavcodec, libavformat) is cool but sometimes you don't want
> the
> full library as a dependancy or for legal reason (patent).


good point

> Im going to try to find an algorithm from mplayer to convert the YUYV
> stream
> > into i guess YV12  as im told its more umm supported? if i can ill add
> it to
> > my program uvcStreamer and see if it yields any results.
>
> YV12 is YUV420 ? Take a look at my tinyjpegdecoder library :-). Ok it's
> not
> released but i'll send you the files.
>
> Luc
>
>

Okay :) i look forward to it!

Tanner

PS: take a look at uvcStreamer (if you want) and let me know what you think