intro.rst 1.9 KB

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  1. .. SPDX-License-Identifier: GPL-2.0
  2. ============
  3. Introduction
  4. ============
  5. This document covers the Linux Kernel to Userspace API's used by video
  6. and radio streaming devices, including video cameras, analog and digital
  7. TV receiver cards, AM/FM receiver cards, Software Defined Radio (SDR),
  8. streaming capture and output devices, codec devices and remote controllers.
  9. A typical media device hardware is shown at :ref:`typical_media_device`.
  10. .. _typical_media_device:
  11. .. kernel-figure:: typical_media_device.svg
  12. :alt: typical_media_device.svg
  13. :align: center
  14. Typical Media Device
  15. The media infrastructure API was designed to control such devices. It is
  16. divided into five parts.
  17. 1. The :ref:`first part <v4l2spec>` covers radio, video capture and output,
  18. cameras, analog TV devices and codecs.
  19. 2. The :ref:`second part <dvbapi>` covers the API used for digital TV and
  20. Internet reception via one of the several digital tv standards. While it is
  21. called as DVB API, in fact it covers several different video standards
  22. including DVB-T/T2, DVB-S/S2, DVB-C, ATSC, ISDB-T, ISDB-S, DTMB, etc. The
  23. complete list of supported standards can be found at
  24. :c:type:`fe_delivery_system`.
  25. 3. The :ref:`third part <remote_controllers>` covers the Remote Controller API.
  26. 4. The :ref:`fourth part <media_controller>` covers the Media Controller API.
  27. 5. The :ref:`fifth part <cec>` covers the CEC (Consumer Electronics Control) API.
  28. It should also be noted that a media device may also have audio components, like
  29. mixers, PCM capture, PCM playback, etc, which are controlled via ALSA API. For
  30. additional information and for the latest development code, see:
  31. `https://linuxtv.org <https://linuxtv.org>`__. For discussing improvements,
  32. reporting troubles, sending new drivers, etc, please mail to: `Linux Media
  33. Mailing List (LMML) <http://vger.kernel.org/vger-lists.html#linux-media>`__.