forked from luck/tmp_suning_uos_patched
8fa1bb506f
Now that we have an extension to handle images, use it. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
47 lines
1.9 KiB
ReStructuredText
47 lines
1.9 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
============
|
|
Introduction
|
|
============
|
|
|
|
This document covers the Linux Kernel to Userspace API's used by video
|
|
and radio streaming devices, including video cameras, analog and digital
|
|
TV receiver cards, AM/FM receiver cards, Software Defined Radio (SDR),
|
|
streaming capture and output devices, codec devices and remote controllers.
|
|
|
|
A typical media device hardware is shown at :ref:`typical_media_device`.
|
|
|
|
.. _typical_media_device:
|
|
|
|
.. kernel-figure:: typical_media_device.svg
|
|
:alt: typical_media_device.svg
|
|
:align: center
|
|
|
|
Typical Media Device
|
|
|
|
The media infrastructure API was designed to control such devices. It is
|
|
divided into five parts.
|
|
|
|
1. The :ref:`first part <v4l2spec>` covers radio, video capture and output,
|
|
cameras, analog TV devices and codecs.
|
|
|
|
2. The :ref:`second part <dvbapi>` covers the API used for digital TV and
|
|
Internet reception via one of the several digital tv standards. While it is
|
|
called as DVB API, in fact it covers several different video standards
|
|
including DVB-T/T2, DVB-S/S2, DVB-C, ATSC, ISDB-T, ISDB-S, DTMB, etc. The
|
|
complete list of supported standards can be found at
|
|
:c:type:`fe_delivery_system`.
|
|
|
|
3. The :ref:`third part <remote_controllers>` covers the Remote Controller API.
|
|
|
|
4. The :ref:`fourth part <media_controller>` covers the Media Controller API.
|
|
|
|
5. The :ref:`fifth part <cec>` covers the CEC (Consumer Electronics Control) API.
|
|
|
|
It should also be noted that a media device may also have audio components, like
|
|
mixers, PCM capture, PCM playback, etc, which are controlled via ALSA API. For
|
|
additional information and for the latest development code, see:
|
|
`https://linuxtv.org <https://linuxtv.org>`__. For discussing improvements,
|
|
reporting troubles, sending new drivers, etc, please mail to: `Linux Media
|
|
Mailing List (LMML) <http://vger.kernel.org/vger-lists.html#linux-media>`__.
|