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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
-
-.. _fm-rx-controls:
-
-*****************************
-FM Receiver Control Reference
-*****************************
-
-The FM Receiver (FM_RX) class includes controls for common features of
-FM Reception capable devices.
-
-
-.. _fm-rx-control-id:
-
-FM_RX Control IDs
-=================
-
-``V4L2_CID_FM_RX_CLASS (class)``
- The FM_RX class descriptor. Calling
- :ref:`VIDIOC_QUERYCTRL` for this control will
- return a description of this control class.
-
-``V4L2_CID_RDS_RECEPTION (boolean)``
- Enables/disables RDS reception by the radio tuner
-
-``V4L2_CID_RDS_RX_PTY (integer)``
- Gets RDS Programme Type field. This encodes up to 31 pre-defined
- programme types.
-
-``V4L2_CID_RDS_RX_PS_NAME (string)``
- Gets the Programme Service name (PS_NAME). It is intended for
- static display on a receiver. It is the primary aid to listeners in
- programme service identification and selection. In Annex E of
- :ref:`iec62106`, the RDS specification, there is a full
- description of the correct character encoding for Programme Service
- name strings. Also from RDS specification, PS is usually a single
- eight character text. However, it is also possible to find receivers
- which can scroll strings sized as 8 x N characters. So, this control
- must be configured with steps of 8 characters. The result is it must
- always contain a string with size multiple of 8.
-
-``V4L2_CID_RDS_RX_RADIO_TEXT (string)``
- Gets the Radio Text info. It is a textual description of what is
- being broadcasted. RDS Radio Text can be applied when broadcaster
- wishes to transmit longer PS names, programme-related information or
- any other text. In these cases, RadioText can be used in addition to
- ``V4L2_CID_RDS_RX_PS_NAME``. The encoding for Radio Text strings is
- also fully described in Annex E of :ref:`iec62106`. The length of
- Radio Text strings depends on which RDS Block is being used to
- transmit it, either 32 (2A block) or 64 (2B block). However, it is
- also possible to find receivers which can scroll strings sized as 32
- x N or 64 x N characters. So, this control must be configured with
- steps of 32 or 64 characters. The result is it must always contain a
- string with size multiple of 32 or 64.
-
-``V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT (boolean)``
- If set, then a traffic announcement is in progress.
-
-``V4L2_CID_RDS_RX_TRAFFIC_PROGRAM (boolean)``
- If set, then the tuned programme carries traffic announcements.
-
-``V4L2_CID_RDS_RX_MUSIC_SPEECH (boolean)``
- If set, then this channel broadcasts music. If cleared, then it
- broadcasts speech. If the transmitter doesn't make this distinction,
- then it will be set.
-
-``V4L2_CID_TUNE_DEEMPHASIS``
- (enum)
-
-enum v4l2_deemphasis -
- Configures the de-emphasis value for reception. A de-emphasis filter
- is applied to the broadcast to accentuate the high audio
- frequencies. Depending on the region, a time constant of either 50
- or 75 useconds is used. The enum v4l2_deemphasis defines possible
- values for de-emphasis. Here they are:
-
-
-
-.. flat-table::
- :header-rows: 0
- :stub-columns: 0
-
- * - ``V4L2_DEEMPHASIS_DISABLED``
- - No de-emphasis is applied.
- * - ``V4L2_DEEMPHASIS_50_uS``
- - A de-emphasis of 50 uS is used.
- * - ``V4L2_DEEMPHASIS_75_uS``
- - A de-emphasis of 75 uS is used.