Re: [Qce-ga-discussion] testquickcam

[Tuukka T. <tu...@ee...>]

On Tue, 20 Apr 2004, Greg Kuchyt wrote:

>I was looking through the testquickcam.c source code and I was looking
>through the read functions (i.e read_test and mmap_test). I'm interested
>to know what kind of data is read into the buffer? Is it just the raw

mmap_test specifically sets vm.format = VIDEO_PALETTE_RGB24 (i.e. it gets
24-bit RGB data).

read appears not to set any format specifically, so it is the default
format which happens to be VIDEO_PALETTE_RGB24 also (but could be different
on different drivers).

>screen capture, and thus must be compressed? I guess a more suiting
>question is, what would have to be done to the buffer in order to get a

With Quickcam Web / LEGO cam you can get some kind or jpeg/mjpeg by using
VIDEO_PALETTE_MJPEG. But typically you must just get some type of data a
driver supports and then compress it into jpeg yourself using e.g. libjpeg.

>jpeg? My apologies if this is off-topic. Thank your for your time, and

Don't be. Your mail is so refreshing after a thousand spams.