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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-10 01:45:54 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-10 01:45:54 +0300
commit96a6de1a541c86e9e67b9c310c14db4099bd1cbc (patch)
treee77eb0e998e996f53dd0709611bd8cdd8776ee70 /Documentation/media/uapi/v4l/dev-teletext.rst
parent36011ddc78395b59a8a418c37f20bcc18828f1ef (diff)
parent15d90a6ae98e6d2c68497b44a491cb9efbb98ab1 (diff)
downloadlinux-96a6de1a541c86e9e67b9c310c14db4099bd1cbc.tar.xz
Merge tag 'media/v5.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media updates from Mauro Carvalho Chehab: - remove sensor drivers that got converted from soc_camera - remaining soc_camera drivers got moved to staging - some documentation cleanups and improvements - the imx staging driver now supports imx7 - the ov9640, mt9m001 and mt9m111 got converted from soc_camera - the vim2m driver now does what a m2m convert driver expects to do - epoll() fixes on media subsystems - several drivers fixes, typos, cleanups and improvements * tag 'media/v5.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (346 commits) media: dvb/earth-pt1: fix wrong initialization for demod blocks media: vim2m: Address some coding style issues media: vim2m: don't use BUG() media: vim2m: speedup passthrough copy media: vim2m: add an horizontal scaler media: vim2m: don't accept YUYV anymore as output format media: vim2m: add vertical linear scaler media: vim2m: better handle cap/out buffers with different sizes media: vim2m: use different framesizes for bayer formats media: vim2m: add support for VIDIOC_ENUM_FRAMESIZES media: vim2m: ensure that width is multiple of two media: vim2m: improve debug messages media: vim2m: add bayer capture formats media: a few more typos at staging, pci, platform, radio and usb media: Documentation: fix several typos media: staging: fix several typos media: include: fix several typos media: common: fix several typos media: v4l2-core: fix several typos media: usb: fix several typos ...
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-.. Permission is granted to copy, distribute and/or modify this
-.. document under the terms of the GNU Free Documentation License,
-.. Version 1.1 or any later version published by the Free Software
-.. Foundation, with no Invariant Sections, no Front-Cover Texts
-.. and no Back-Cover Texts. A copy of the license is included at
-.. Documentation/media/uapi/fdl-appendix.rst.
-..
-.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
-
-.. _ttx:
-
-******************
-Teletext Interface
-******************
-
-This interface was aimed at devices receiving and demodulating Teletext
-data [:ref:`ets300706`, :ref:`itu653`], evaluating the Teletext
-packages and storing formatted pages in cache memory. Such devices are
-usually implemented as microcontrollers with serial interface
-(I\ :sup:`2`\ C) and could be found on old TV cards, dedicated Teletext
-decoding cards and home-brew devices connected to the PC parallel port.
-
-The Teletext API was designed by Martin Buck. It was defined in the
-kernel header file ``linux/videotext.h``, the specification is available
-from
-`ftp://ftp.gwdg.de/pub/linux/misc/videotext/ <ftp://ftp.gwdg.de/pub/linux/misc/videotext/>`__.
-(Videotext is the name of the German public television Teletext
-service.)
-
-Eventually the Teletext API was integrated into the V4L API with
-character device file names ``/dev/vtx0`` to ``/dev/vtx31``, device
-major number 81, minor numbers 192 to 223.
-
-However, teletext decoders were quickly replaced by more generic VBI
-demodulators and those dedicated teletext decoders no longer exist. For
-many years the vtx devices were still around, even though nobody used
-them. So the decision was made to finally remove support for the
-Teletext API in kernel 2.6.37.
-
-Modern devices all use the :ref:`raw <raw-vbi>` or
-:ref:`sliced` VBI API.