On Thursday 15 January 2009 05:49:46 Jean-Francois Moine wrote: > On Wed, 14 Jan 2009 20:59:34 -0600 > Kyle Guinn <elyk03@xxxxxxxxx> wrote: > > Add a pixel format for the Mars-Semi MR97310A webcam controller. > > > > The MR97310A is a dual-mode webcam controller that provides > > compressed BGGR Bayer frames. The decompression algorithm for still > > images is the same as for video, and is currently implemented in > > libgphoto2. > > Hi Kyle, > > What is the difference of this pixel format from the other Bayer ones? > This is a standard BGGR Bayer format which is compressed using a vendor-specific compression algorithm, much like V4L2_PIX_FMT_PAC207. I don't believe the compression algorithm matches any of the other pixel formats. The first two pixels in the first two rows are stored as raw 8-bit values (the top-left BGGR square), but the rest is Huffman compressed. Take a look at precalc_table() and mars_decompress() in libgphoto2/camlibs/mars/mars.c for all of the details. If you recognize this as an existing pixel format, please let me know. > Also, did you ask Hans de Goede to add the decoding to the v4l library? > That is next on my TODO list. I have a patch ready to send, but I first want to make sure there are no problems with adding this pixel format. Regards, -Kyle -- 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
