On Sunday 30 May 2010 21:26:14 Andy Walls wrote: > On Sun, 2010-05-30 at 19:55 +0200, Ondrej Zary wrote: > > On Sunday 30 May 2010 13:34:55 Jean-Francois Moine wrote: > > > On Sat, 29 May 2010 21:32:07 +0200 > > > > > > Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx> wrote: > > > > The Color Space/Compression reported by the driver is only one: RGB > > > > 24 The driver also uses these files which may (or may not) be related > > > > to used compression: iyuv_32.dll, msh263.drv, msyuv.dll, tsbyuv.dll > > > > In standalone mode, the camera records video in MJPEG format. > > > > > > Hello Ondrej, > > > > > > Bad news, the images are compressed by an unknown algorithm (unknown > > > from Linux point of vue). The decompression function could be found in > > > some part of the ms-win driver, but: > > > - first, I have no time to search and disassemble this function, > > > - then, I did have this problem with an other webcam (17a1:0118), and > > > after searching for a long time, nobody could find the function, and > > > the driver is in stand-by since 2 years, > > > - eventually, is this legal? > > > > That's bad... > > > > The driver contains file sp5x_32.dll which is registered in system.ini > > file as [drivers32] > > VIDC.SP54=SP5X_32.DLL > > > > Seems that the codec is called SP54 - hope that it's used to decompress > > the data. > > > > > All I can do is to code the driver and let you or anyone find the > > > decompression function... > > SP54 is Sunplus' ( http://www.sunplus.com.tw/ ) FourCC code for a > version of MJPEG with the headers removed according to > > http://www.fourcc.org/ > > > Maybe we can dump some data, create AVI file from that and try to decode > > the file using that codec. > > FourCC.org points to this page: > > http://libland.fr.st/download.html > > which points to a utility to conver the data back into an MJPEG: > > http://mxhaard.free.fr/spca50x/Download/sp54convert.tar.gz > > > I have no idea if any of the above is true, 'cause I read it on the > Internet. ;) Modified that utility to work on raw video frame extracted from usbsnoop file. The bad news is that the resulting jpeg file is not readable. I also deleted the sp5x_32.dll file and the camera still works... -- Ondrej Zary -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
