470 lines
14 KiB
ReStructuredText
470 lines
14 KiB
ReStructuredText
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.. -*- coding: utf-8; mode: rst -*-
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.. _VIDIOC_G_TUNER:
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************************************
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ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER
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************************************
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Name
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====
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VIDIOC_G_TUNER - VIDIOC_S_TUNER - Get or set tuner attributes
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Synopsis
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========
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.. c:function:: int ioctl( int fd, VIDIOC_G_TUNER, struct v4l2_tuner *argp )
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:name: VIDIOC_G_TUNER
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.. c:function:: int ioctl( int fd, VIDIOC_S_TUNER, const struct v4l2_tuner *argp )
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:name: VIDIOC_S_TUNER
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Arguments
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=========
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``fd``
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File descriptor returned by :ref:`open() <func-open>`.
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``argp``
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Pointer to struct :c:type:`v4l2_tuner`.
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Description
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===========
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To query the attributes of a tuner applications initialize the ``index``
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field and zero out the ``reserved`` array of a struct
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:c:type:`v4l2_tuner` and call the ``VIDIOC_G_TUNER`` ioctl
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with a pointer to this structure. Drivers fill the rest of the structure
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or return an ``EINVAL`` error code when the index is out of bounds. To
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enumerate all tuners applications shall begin at index zero,
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incrementing by one until the driver returns ``EINVAL``.
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Tuners have two writable properties, the audio mode and the radio
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frequency. To change the audio mode, applications initialize the
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``index``, ``audmode`` and ``reserved`` fields and call the
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``VIDIOC_S_TUNER`` ioctl. This will *not* change the current tuner,
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which is determined by the current video input. Drivers may choose a
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different audio mode if the requested mode is invalid or unsupported.
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Since this is a write-only ioctl, it does not return the actually
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selected audio mode.
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:ref:`SDR <sdr>` specific tuner types are ``V4L2_TUNER_SDR`` and
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``V4L2_TUNER_RF``. For SDR devices ``audmode`` field must be initialized
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to zero. The term 'tuner' means SDR receiver in this context.
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To change the radio frequency the
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:ref:`VIDIOC_S_FREQUENCY <VIDIOC_G_FREQUENCY>` ioctl is available.
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.. tabularcolumns:: |p{1.3cm}|p{3.0cm}|p{6.6cm}|p{6.6cm}|
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.. c:type:: v4l2_tuner
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.. cssclass:: longtable
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.. flat-table:: struct v4l2_tuner
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:header-rows: 0
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:stub-columns: 0
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* - __u32
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- ``index``
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- :cspan:`1` Identifies the tuner, set by the application.
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* - __u8
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- ``name``\ [32]
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- :cspan:`1`
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Name of the tuner, a NUL-terminated ASCII string.
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This information is intended for the user.
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* - __u32
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- ``type``
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- :cspan:`1` Type of the tuner, see :c:type:`v4l2_tuner_type`.
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* - __u32
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- ``capability``
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- :cspan:`1`
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Tuner capability flags, see :ref:`tuner-capability`. Audio flags
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indicate the ability to decode audio subprograms. They will *not*
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change, for example with the current video standard.
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When the structure refers to a radio tuner the
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``V4L2_TUNER_CAP_LANG1``, ``V4L2_TUNER_CAP_LANG2`` and
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``V4L2_TUNER_CAP_NORM`` flags can't be used.
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If multiple frequency bands are supported, then ``capability`` is
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the union of all ``capability`` fields of each struct
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:c:type:`v4l2_frequency_band`.
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* - __u32
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- ``rangelow``
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- :cspan:`1` The lowest tunable frequency in units of 62.5 kHz, or
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if the ``capability`` flag ``V4L2_TUNER_CAP_LOW`` is set, in units
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of 62.5 Hz, or if the ``capability`` flag ``V4L2_TUNER_CAP_1HZ``
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is set, in units of 1 Hz. If multiple frequency bands are
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supported, then ``rangelow`` is the lowest frequency of all the
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frequency bands.
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* - __u32
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- ``rangehigh``
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- :cspan:`1` The highest tunable frequency in units of 62.5 kHz,
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or if the ``capability`` flag ``V4L2_TUNER_CAP_LOW`` is set, in
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units of 62.5 Hz, or if the ``capability`` flag
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``V4L2_TUNER_CAP_1HZ`` is set, in units of 1 Hz. If multiple
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frequency bands are supported, then ``rangehigh`` is the highest
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frequency of all the frequency bands.
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* - __u32
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- ``rxsubchans``
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- :cspan:`1`
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Some tuners or audio decoders can determine the received audio
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subprograms by analyzing audio carriers, pilot tones or other
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indicators. To pass this information drivers set flags defined in
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:ref:`tuner-rxsubchans` in this field. For example:
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* -
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-
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- ``V4L2_TUNER_SUB_MONO``
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- receiving mono audio
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* -
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-
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- ``STEREO | SAP``
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- receiving stereo audio and a secondary audio program
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* -
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-
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- ``MONO | STEREO``
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- receiving mono or stereo audio, the hardware cannot distinguish
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* -
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-
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- ``LANG1 | LANG2``
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- receiving bilingual audio
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* -
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-
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- ``MONO | STEREO | LANG1 | LANG2``
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- receiving mono, stereo or bilingual audio
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* -
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-
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- :cspan:`1`
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When the ``V4L2_TUNER_CAP_STEREO``, ``_LANG1``, ``_LANG2`` or
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``_SAP`` flag is cleared in the ``capability`` field, the
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corresponding ``V4L2_TUNER_SUB_`` flag must not be set here.
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This field is valid only if this is the tuner of the current video
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input, or when the structure refers to a radio tuner.
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* - __u32
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- ``audmode``
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- :cspan:`1`
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The selected audio mode, see :ref:`tuner-audmode` for valid
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values. The audio mode does not affect audio subprogram detection,
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and like a :ref:`control` it does not automatically
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change unless the requested mode is invalid or unsupported. See
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:ref:`tuner-matrix` for possible results when the selected and
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received audio programs do not match.
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Currently this is the only field of struct
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struct :c:type:`v4l2_tuner` applications can change.
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* - __u32
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- ``signal``
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- :cspan:`1` The signal strength if known.
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Ranging from 0 to 65535. Higher values indicate a better signal.
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* - __s32
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- ``afc``
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- :cspan:`1` Automatic frequency control.
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When the ``afc`` value is negative, the frequency is too
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low, when positive too high.
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* - __u32
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- ``reserved``\ [4]
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- :cspan:`1` Reserved for future extensions.
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Drivers and applications must set the array to zero.
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.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
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.. c:type:: v4l2_tuner_type
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.. flat-table:: enum v4l2_tuner_type
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:header-rows: 0
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:stub-columns: 0
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:widths: 3 1 6
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* - ``V4L2_TUNER_RADIO``
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- 1
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- Tuner supports radio
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* - ``V4L2_TUNER_ANALOG_TV``
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- 2
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- Tuner supports analog TV
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* - ``V4L2_TUNER_SDR``
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- 4
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- Tuner controls the A/D and/or D/A block of a
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Software Digital Radio (SDR)
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* - ``V4L2_TUNER_RF``
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- 5
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- Tuner controls the RF part of a Software Digital Radio (SDR)
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.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
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.. _tuner-capability:
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.. cssclass:: longtable
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.. flat-table:: Tuner and Modulator Capability Flags
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:header-rows: 0
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:stub-columns: 0
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:widths: 3 1 4
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* - ``V4L2_TUNER_CAP_LOW``
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- 0x0001
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- When set, tuning frequencies are expressed in units of 62.5 Hz
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instead of 62.5 kHz.
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* - ``V4L2_TUNER_CAP_NORM``
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- 0x0002
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- This is a multi-standard tuner; the video standard can or must be
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switched. (B/G PAL tuners for example are typically not considered
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multi-standard because the video standard is automatically
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determined from the frequency band.) The set of supported video
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standards is available from the struct
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:c:type:`v4l2_input` pointing to this tuner, see the
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description of ioctl :ref:`VIDIOC_ENUMINPUT`
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for details. Only ``V4L2_TUNER_ANALOG_TV`` tuners can have this
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capability.
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* - ``V4L2_TUNER_CAP_HWSEEK_BOUNDED``
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- 0x0004
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- If set, then this tuner supports the hardware seek functionality
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where the seek stops when it reaches the end of the frequency
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range.
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* - ``V4L2_TUNER_CAP_HWSEEK_WRAP``
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- 0x0008
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- If set, then this tuner supports the hardware seek functionality
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where the seek wraps around when it reaches the end of the
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frequency range.
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* - ``V4L2_TUNER_CAP_STEREO``
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- 0x0010
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- Stereo audio reception is supported.
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* - ``V4L2_TUNER_CAP_LANG1``
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- 0x0040
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- Reception of the primary language of a bilingual audio program is
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supported. Bilingual audio is a feature of two-channel systems,
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transmitting the primary language monaural on the main audio
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carrier and a secondary language monaural on a second carrier.
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Only ``V4L2_TUNER_ANALOG_TV`` tuners can have this capability.
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* - ``V4L2_TUNER_CAP_LANG2``
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- 0x0020
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- Reception of the secondary language of a bilingual audio program
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is supported. Only ``V4L2_TUNER_ANALOG_TV`` tuners can have this
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capability.
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* - ``V4L2_TUNER_CAP_SAP``
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- 0x0020
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- Reception of a secondary audio program is supported. This is a
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feature of the BTSC system which accompanies the NTSC video
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standard. Two audio carriers are available for mono or stereo
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transmissions of a primary language, and an independent third
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carrier for a monaural secondary language. Only
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``V4L2_TUNER_ANALOG_TV`` tuners can have this capability.
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.. note::
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The ``V4L2_TUNER_CAP_LANG2`` and ``V4L2_TUNER_CAP_SAP``
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flags are synonyms. ``V4L2_TUNER_CAP_SAP`` applies when the tuner
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supports the ``V4L2_STD_NTSC_M`` video standard.
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* - ``V4L2_TUNER_CAP_RDS``
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- 0x0080
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- RDS capture is supported. This capability is only valid for radio
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tuners.
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* - ``V4L2_TUNER_CAP_RDS_BLOCK_IO``
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- 0x0100
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- The RDS data is passed as unparsed RDS blocks.
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* - ``V4L2_TUNER_CAP_RDS_CONTROLS``
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- 0x0200
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- The RDS data is parsed by the hardware and set via controls.
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* - ``V4L2_TUNER_CAP_FREQ_BANDS``
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- 0x0400
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- The :ref:`VIDIOC_ENUM_FREQ_BANDS`
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ioctl can be used to enumerate the available frequency bands.
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* - ``V4L2_TUNER_CAP_HWSEEK_PROG_LIM``
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- 0x0800
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- The range to search when using the hardware seek functionality is
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programmable, see
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:ref:`VIDIOC_S_HW_FREQ_SEEK` for
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details.
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* - ``V4L2_TUNER_CAP_1HZ``
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- 0x1000
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- When set, tuning frequencies are expressed in units of 1 Hz
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instead of 62.5 kHz.
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.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
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.. _tuner-rxsubchans:
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.. flat-table:: Tuner Audio Reception Flags
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:header-rows: 0
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:stub-columns: 0
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:widths: 3 1 4
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* - ``V4L2_TUNER_SUB_MONO``
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- 0x0001
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- The tuner receives a mono audio signal.
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* - ``V4L2_TUNER_SUB_STEREO``
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- 0x0002
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- The tuner receives a stereo audio signal.
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* - ``V4L2_TUNER_SUB_LANG1``
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- 0x0008
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- The tuner receives the primary language of a bilingual audio
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signal. Drivers must clear this flag when the current video
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standard is ``V4L2_STD_NTSC_M``.
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* - ``V4L2_TUNER_SUB_LANG2``
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- 0x0004
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- The tuner receives the secondary language of a bilingual audio
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signal (or a second audio program).
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* - ``V4L2_TUNER_SUB_SAP``
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- 0x0004
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- The tuner receives a Second Audio Program.
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.. note::
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The ``V4L2_TUNER_SUB_LANG2`` and ``V4L2_TUNER_SUB_SAP``
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flags are synonyms. The ``V4L2_TUNER_SUB_SAP`` flag applies
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when the current video standard is ``V4L2_STD_NTSC_M``.
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* - ``V4L2_TUNER_SUB_RDS``
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- 0x0010
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- The tuner receives an RDS channel.
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.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
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.. _tuner-audmode:
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.. flat-table:: Tuner Audio Modes
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:header-rows: 0
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:stub-columns: 0
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:widths: 3 1 4
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* - ``V4L2_TUNER_MODE_MONO``
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- 0
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||
|
|
- Play mono audio. When the tuner receives a stereo signal this a
|
||
|
|
down-mix of the left and right channel. When the tuner receives a
|
||
|
|
bilingual or SAP signal this mode selects the primary language.
|
||
|
|
* - ``V4L2_TUNER_MODE_STEREO``
|
||
|
|
- 1
|
||
|
|
- Play stereo audio. When the tuner receives bilingual audio it may
|
||
|
|
play different languages on the left and right channel or the
|
||
|
|
primary language is played on both channels.
|
||
|
|
|
||
|
|
Playing different languages in this mode is deprecated. New
|
||
|
|
drivers should do this only in ``MODE_LANG1_LANG2``.
|
||
|
|
|
||
|
|
When the tuner receives no stereo signal or does not support
|
||
|
|
stereo reception the driver shall fall back to ``MODE_MONO``.
|
||
|
|
* - ``V4L2_TUNER_MODE_LANG1``
|
||
|
|
- 3
|
||
|
|
- Play the primary language, mono or stereo. Only
|
||
|
|
``V4L2_TUNER_ANALOG_TV`` tuners support this mode.
|
||
|
|
* - ``V4L2_TUNER_MODE_LANG2``
|
||
|
|
- 2
|
||
|
|
- Play the secondary language, mono. When the tuner receives no
|
||
|
|
bilingual audio or SAP, or their reception is not supported the
|
||
|
|
driver shall fall back to mono or stereo mode. Only
|
||
|
|
``V4L2_TUNER_ANALOG_TV`` tuners support this mode.
|
||
|
|
* - ``V4L2_TUNER_MODE_SAP``
|
||
|
|
- 2
|
||
|
|
- Play the Second Audio Program. When the tuner receives no
|
||
|
|
bilingual audio or SAP, or their reception is not supported the
|
||
|
|
driver shall fall back to mono or stereo mode. Only
|
||
|
|
``V4L2_TUNER_ANALOG_TV`` tuners support this mode.
|
||
|
|
|
||
|
|
.. note:: The ``V4L2_TUNER_MODE_LANG2`` and ``V4L2_TUNER_MODE_SAP``
|
||
|
|
are synonyms.
|
||
|
|
* - ``V4L2_TUNER_MODE_LANG1_LANG2``
|
||
|
|
- 4
|
||
|
|
- Play the primary language on the left channel, the secondary
|
||
|
|
language on the right channel. When the tuner receives no
|
||
|
|
bilingual audio or SAP, it shall fall back to ``MODE_LANG1`` or
|
||
|
|
``MODE_MONO``. Only ``V4L2_TUNER_ANALOG_TV`` tuners support this
|
||
|
|
mode.
|
||
|
|
|
||
|
|
.. raw:: latex
|
||
|
|
|
||
|
|
\scriptsize
|
||
|
|
|
||
|
|
.. tabularcolumns:: |p{1.5cm}|p{1.5cm}|p{2.9cm}|p{2.9cm}|p{2.9cm}|p{2.9cm}|
|
||
|
|
|
||
|
|
.. _tuner-matrix:
|
||
|
|
|
||
|
|
.. flat-table:: Tuner Audio Matrix
|
||
|
|
:header-rows: 2
|
||
|
|
:stub-columns: 0
|
||
|
|
:widths: 7 7 14 14 14 14
|
||
|
|
|
||
|
|
* -
|
||
|
|
- :cspan:`4` Selected ``V4L2_TUNER_MODE_``
|
||
|
|
* - Received ``V4L2_TUNER_SUB_``
|
||
|
|
- ``MONO``
|
||
|
|
- ``STEREO``
|
||
|
|
- ``LANG1``
|
||
|
|
- ``LANG2 = SAP``
|
||
|
|
- ``LANG1_LANG2``\ [#f1]_
|
||
|
|
* - ``MONO``
|
||
|
|
- Mono
|
||
|
|
- Mono/Mono
|
||
|
|
- Mono
|
||
|
|
- Mono
|
||
|
|
- Mono/Mono
|
||
|
|
* - ``MONO | SAP``
|
||
|
|
- Mono
|
||
|
|
- Mono/Mono
|
||
|
|
- Mono
|
||
|
|
- SAP
|
||
|
|
- Mono/SAP (preferred) or Mono/Mono
|
||
|
|
* - ``STEREO``
|
||
|
|
- L+R
|
||
|
|
- L/R
|
||
|
|
- Stereo L/R (preferred) or Mono L+R
|
||
|
|
- Stereo L/R (preferred) or Mono L+R
|
||
|
|
- L/R (preferred) or L+R/L+R
|
||
|
|
* - ``STEREO | SAP``
|
||
|
|
- L+R
|
||
|
|
- L/R
|
||
|
|
- Stereo L/R (preferred) or Mono L+R
|
||
|
|
- SAP
|
||
|
|
- L+R/SAP (preferred) or L/R or L+R/L+R
|
||
|
|
* - ``LANG1 | LANG2``
|
||
|
|
- Language 1
|
||
|
|
- Lang1/Lang2 (deprecated\ [#f2]_) or Lang1/Lang1
|
||
|
|
- Language 1
|
||
|
|
- Language 2
|
||
|
|
- Lang1/Lang2 (preferred) or Lang1/Lang1
|
||
|
|
|
||
|
|
.. raw:: latex
|
||
|
|
|
||
|
|
\normalsize
|
||
|
|
|
||
|
|
Return Value
|
||
|
|
============
|
||
|
|
|
||
|
|
On success 0 is returned, on error -1 and the ``errno`` variable is set
|
||
|
|
appropriately. The generic error codes are described at the
|
||
|
|
:ref:`Generic Error Codes <gen-errors>` chapter.
|
||
|
|
|
||
|
|
EINVAL
|
||
|
|
The struct :c:type:`v4l2_tuner` ``index`` is out of
|
||
|
|
bounds.
|
||
|
|
|
||
|
|
.. [#f1]
|
||
|
|
This mode has been added in Linux 2.6.17 and may not be supported by
|
||
|
|
older drivers.
|
||
|
|
|
||
|
|
.. [#f2]
|
||
|
|
Playback of both languages in ``MODE_STEREO`` is deprecated. In the
|
||
|
|
future drivers should produce only the primary language in this mode.
|
||
|
|
Applications should request ``MODE_LANG1_LANG2`` to record both
|
||
|
|
languages or a stereo signal.
|