media/v4l/tuner.rst

1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 Video input devices can have one or more tuners demodulating a RF
14 signal. Each tuner is associated with one or more video inputs,
18 set to ``V4L2_INPUT_TYPE_TUNER`` and its ``tuner`` field contains the
21 Radio input devices have exactly one tuner with index zero, no video
24 To query and change tuner properties applications use the
34    current tuner, when there is more than one. The tuner is solely
38    device has one or more tuners.
44 Video output devices can have one or more modulators, that modulate a
45 video signal for radiation or connection to the antenna input of a TV
46 set or video recorder. Each modulator is associated with one or more
50 :ref:`VIDIOC_ENUMOUTPUT` ioctl is set to
54 Radio output devices have exactly one modulator with index zero, no
58 separate device nodes will have to be used for such hardware, one that
59 supports the tuner functionality and one that supports the modulator
64 To query and change modulator properties applications use the
68 is more than one at all. The modulator is solely determined by the
73 one or more modulators.
79 To get and set the tuner or modulator radio frequency applications use
82 a pointer to a struct :c:type:`v4l2_frequency`. These