Re: [PATCH 1/2] Add Mars-Semi MR97310A format
On Thursday 15 January 2009 05:49:46 Jean-Francois Moine wrote: > On Wed, 14 Jan 2009 20:59:34 -0600 > Kyle Guinn 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH 1/2] Add Mars-Semi MR97310A format
On Wed, 14 Jan 2009 20:59:34 -0600 Kyle Guinn 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? Also, did you ask Hans de Goede to add the decoding to the v4l library? Regards. -- Ken ar c'hentaƱ | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH 1/2] Add Mars-Semi MR97310A format
# HG changeset patch # User Kyle Guinn # Date 1231822560 21600 # Node ID 1bf7a4403e5f1cd10f12a69a9d9239f1bf4a58b6 # Parent b09b5128742f75bb0ce4375b23feac6c5f560aec Add Mars-Semi MR97310A format From: Kyle Guinn 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. Priority: normal Signed-off-by: Kyle Guinn diff --git a/linux/include/linux/videodev2.h b/linux/include/linux/videodev2.h --- a/linux/include/linux/videodev2.h +++ b/linux/include/linux/videodev2.h @@ -344,6 +344,7 @@ #define V4L2_PIX_FMT_SPCA508 v4l2_fourcc('S', '5', '0', '8') /* YUVY per line */ #define V4L2_PIX_FMT_SPCA561 v4l2_fourcc('S', '5', '6', '1') /* compressed GBRG bayer */ #define V4L2_PIX_FMT_PAC207 v4l2_fourcc('P', '2', '0', '7') /* compressed BGGR bayer */ +#define V4L2_PIX_FMT_MR97310A v4l2_fourcc('M', '3', '1', '0') /* compressed BGGR bayer */ #define V4L2_PIX_FMT_PJPG v4l2_fourcc('P', 'J', 'P', 'G') /* Pixart 73xx JPEG */ #define V4L2_PIX_FMT_YVYUv4l2_fourcc('Y', 'V', 'Y', 'U') /* 16 YVU 4:2:2 */ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html