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author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-18 14:07:10 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-07-18 14:07:10 -0300 |
commit | d7b3ae79e1f72218b1a196c3669ff2d29e9b9c11 (patch) | |
tree | ff28c0047b419e8119eb638aafe7d14cac66f932 /Documentation/video4linux | |
parent | b3b7ea9aa7fc7551ee283df6987ceedc709ad56d (diff) | |
download | op-kernel-dev-d7b3ae79e1f72218b1a196c3669ff2d29e9b9c11.zip op-kernel-dev-d7b3ae79e1f72218b1a196c3669ff2d29e9b9c11.tar.gz |
[media] cx2341x.rst: add contents of README.vbi
Finally, adds the content of README.vbi at cx2341x.rst after
its conversion to ReST format.
Now, add information about this chipset and its driver is
inside a single chapter at the media/v4l-drivers book.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'Documentation/video4linux')
-rw-r--r-- | Documentation/video4linux/cx2341x/README.vbi | 45 |
1 files changed, 0 insertions, 45 deletions
diff --git a/Documentation/video4linux/cx2341x/README.vbi b/Documentation/video4linux/cx2341x/README.vbi deleted file mode 100644 index 5807cf1..0000000 --- a/Documentation/video4linux/cx2341x/README.vbi +++ /dev/null @@ -1,45 +0,0 @@ - -Format of embedded V4L2_MPEG_STREAM_VBI_FMT_IVTV VBI data -========================================================= - -This document describes the V4L2_MPEG_STREAM_VBI_FMT_IVTV format of the VBI data -embedded in an MPEG-2 program stream. This format is in part dictated by some -hardware limitations of the ivtv driver (the driver for the Conexant cx23415/6 -chips), in particular a maximum size for the VBI data. Anything longer is cut -off when the MPEG stream is played back through the cx23415. - -The advantage of this format is it is very compact and that all VBI data for -all lines can be stored while still fitting within the maximum allowed size. - -The stream ID of the VBI data is 0xBD. The maximum size of the embedded data is -4 + 43 * 36, which is 4 bytes for a header and 2 * 18 VBI lines with a 1 byte -header and a 42 bytes payload each. Anything beyond this limit is cut off by -the cx23415/6 firmware. Besides the data for the VBI lines we also need 36 bits -for a bitmask determining which lines are captured and 4 bytes for a magic cookie, -signifying that this data package contains V4L2_MPEG_STREAM_VBI_FMT_IVTV VBI data. -If all lines are used, then there is no longer room for the bitmask. To solve this -two different magic numbers were introduced: - -'itv0': After this magic number two unsigned longs follow. Bits 0-17 of the first -unsigned long denote which lines of the first field are captured. Bits 18-31 of -the first unsigned long and bits 0-3 of the second unsigned long are used for the -second field. - -'ITV0': This magic number assumes all VBI lines are captured, i.e. it implicitly -implies that the bitmasks are 0xffffffff and 0xf. - -After these magic cookies (and the 8 byte bitmask in case of cookie 'itv0') the -captured VBI lines start: - -For each line the least significant 4 bits of the first byte contain the data type. -Possible values are shown in the table below. The payload is in the following 42 -bytes. - -Here is the list of possible data types: - -#define IVTV_SLICED_TYPE_TELETEXT 0x1 // Teletext (uses lines 6-22 for PAL) -#define IVTV_SLICED_TYPE_CC 0x4 // Closed Captions (line 21 NTSC) -#define IVTV_SLICED_TYPE_WSS 0x5 // Wide Screen Signal (line 23 PAL) -#define IVTV_SLICED_TYPE_VPS 0x7 // Video Programming System (PAL) (line 16) - -Hans Verkuil <hverkuil@xs4all.nl> |