On Tue, 17 Feb 2009 20:35:28 +0100 Thomas Kaiser <v4l@xxxxxxxxxxxxxxx> wrote: > Jean-Francois Moine wrote: > > BTW, I am coding the subdriver of a new webcam, and I could not find > > how to decompress the images. It tried many decompression functions, > > those from the v4l library and most from libgphoto2 without any > > success. Does anyone know how to find the compression algorithm? > > Hello Jean-Francois > > Do you have some more information about the cam and the stream? > Do you know the frame header? > Any idea what the compression should be? > Can you provide a raw stream from the cam? Hello Thomas, The cam is a Tascorp 17a1:0118. I have USB traces. Starting the webcam is easy, and so is extracting the images (0x02 + 0xa0/0xa1 at start of image packets and 0x5a + 0xa5 for end of image with average luminosity). I attach an image I extracted by hand from the trace, removing the 2 bytes of the packets. If it can help, I may send you the whole USB trace (3 Mb) and/or other images. Cheers. -- Ken ar c'hentan | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/
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