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7347081e8a
There are lots of internal references in the form:
:ref:`foo <foo>`
Simplify them to be just: :ref:`foo`.
Patch generated via this small script:
for j in $(find . -name '*'); do echo $j; perl -ne 'if (m/\`(\S+)\s*\<(\S+)\>\`/) { if (!($1=~'http') && $1 eq $2) { s,\s*\<(\S+)\>,,; } } print $_' <$j >a && mv a $j; done
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
44 lines
1.8 KiB
ReStructuredText
44 lines
1.8 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _ttx:
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******************
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Teletext Interface
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******************
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This interface was aimed at devices receiving and demodulating Teletext
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data [:ref:`ets300706`, :ref:`itu653`], evaluating the Teletext
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packages and storing formatted pages in cache memory. Such devices are
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usually implemented as microcontrollers with serial interface
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(I:sup:`2`\ C) and could be found on old TV cards, dedicated Teletext
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decoding cards and home-brew devices connected to the PC parallel port.
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The Teletext API was designed by Martin Buck. It was defined in the
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kernel header file ``linux/videotext.h``, the specification is available
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from
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`ftp://ftp.gwdg.de/pub/linux/misc/videotext/ <ftp://ftp.gwdg.de/pub/linux/misc/videotext/>`__.
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(Videotext is the name of the German public television Teletext
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service.)
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Eventually the Teletext API was integrated into the V4L API with
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character device file names ``/dev/vtx0`` to ``/dev/vtx31``, device
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major number 81, minor numbers 192 to 223.
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However, teletext decoders were quickly replaced by more generic VBI
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demodulators and those dedicated teletext decoders no longer exist. For
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many years the vtx devices were still around, even though nobody used
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them. So the decision was made to finally remove support for the
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Teletext API in kernel 2.6.37.
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Modern devices all use the :ref:`raw <raw-vbi>` or
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:ref:`sliced` VBI API.
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.. ------------------------------------------------------------------------------
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.. This file was automatically converted from DocBook-XML with the dbxml
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.. library (https://github.com/return42/sphkerneldoc). The origin XML comes
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.. from the linux kernel, refer to:
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..
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.. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook
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.. ------------------------------------------------------------------------------
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