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