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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="LINUX MEDIA INFRASTRUCTURE API" /><link rel="up" href="apa.html" title="Appendix A. Function Reference" /><link rel="prev" href="re50.html" title="ioctl VIDIOC_G_STD, VIDIOC_S_STD" /><link rel="next" href="re52.html" title="ioctl VIDIOC_LOG_STATUS" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re50.html">Prev</a> </td><th width="60%" align="center">Appendix A. Function Reference</th><td width="20%" align="right"> <a accesskey="n" href="re52.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER"><a id="vidioc-g-tuner"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>VIDIOC_G_TUNER, VIDIOC_S_TUNER — Get or set tuner attributes</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">ioctl</b>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">request</var>, </td></tr><tr><td> </td><td>struct v4l2_tuner
*<var class="pdparam">argp</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">ioctl</b>(</code></td><td>int <var class="pdparam">fd</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">request</var>, </td></tr><tr><td> </td><td>const struct v4l2_tuner
*<var class="pdparam">argp</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2914844"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>fd</code></em></span></dt><dd><p>File descriptor returned by <a class="link" href="re64.html" title="V4L2 open()"><code class="function">open()</code></a>.</p></dd><dt><span class="term"><em class="parameter"><code>request</code></em></span></dt><dd><p>VIDIOC_G_TUNER, VIDIOC_S_TUNER</p></dd><dt><span class="term"><em class="parameter"><code>argp</code></em></span></dt><dd><p></p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2914913"></a><h2>Description</h2><p>To query the attributes of a tuner applications initialize the
<em class="structfield"><code>index</code></em> field and zero out the
<em class="structfield"><code>reserved</code></em> array of a struct <a class="link" href="re51.html#v4l2-tuner" title="Table A.60. struct v4l2_tuner">v4l2_tuner</a> and call the
<code class="constant">VIDIOC_G_TUNER</code> ioctl with a pointer to this
structure. Drivers fill the rest of the structure or return an
<span class="errorcode">EINVAL</span> error code when the index is out of bounds. To enumerate all tuners
applications shall begin at index zero, incrementing by one until the
driver returns <span class="errorcode">EINVAL</span>.</p><p>Tuners have two writable properties, the audio mode and
the radio frequency. To change the audio mode, applications initialize
the <em class="structfield"><code>index</code></em>,
<em class="structfield"><code>audmode</code></em> and
<em class="structfield"><code>reserved</code></em> fields and call the
<code class="constant">VIDIOC_S_TUNER</code> ioctl. This will
<span class="emphasis"><em>not</em></span> change the current tuner, which is determined
by the current video input. Drivers may choose a different audio mode
if the requested mode is invalid or unsupported. Since this is a
write-only ioctl, it does not return the actually
selected audio mode.</p><p>To change the radio frequency the <a class="link" href="re42.html" title="ioctl VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY"><code class="constant">VIDIOC_S_FREQUENCY</code></a> ioctl
is available.</p><div class="table"><a id="v4l2-tuner"></a><p class="title"><b>Table A.60. struct <span class="structname">v4l2_tuner</span></b></p><div class="table-contents"><table summary="struct v4l2_tuner" width="100%" border="0"><colgroup><col /><col /><col /></colgroup><tbody valign="top"><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>index</code></em></td><td colspan="2" valign="top">Identifies the tuner, set by the
application.</td></tr><tr><td valign="top">__u8</td><td valign="top"><em class="structfield"><code>name</code></em>[32]</td><td colspan="2" valign="top"><p>Name of the tuner, a
NUL-terminated ASCII string. This information is intended for the
user.</p></td></tr><tr><td valign="top">enum <a class="link" href="re51.html#v4l2-tuner-type" title="Table A.61. enum v4l2_tuner_type">v4l2_tuner_type</a></td><td valign="top"><em class="structfield"><code>type</code></em></td><td colspan="2" valign="top">Type of the tuner, see <a class="xref" href="re51.html#v4l2-tuner-type" title="Table A.61. enum v4l2_tuner_type">Table A.61, “enum v4l2_tuner_type”</a>.</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>capability</code></em></td><td colspan="2" valign="top"><p>Tuner capability flags, see
<a class="xref" href="re51.html#tuner-capability" title="Table A.62. Tuner and Modulator Capability Flags">Table A.62, “Tuner and Modulator Capability Flags”</a>. Audio flags indicate the ability
to decode audio subprograms. They will <span class="emphasis"><em>not</em></span>
change, for example with the current video standard.</p><p>When
the structure refers to a radio tuner only the
<code class="constant">V4L2_TUNER_CAP_LOW</code>,
<code class="constant">V4L2_TUNER_CAP_STEREO</code> and
<code class="constant">V4L2_TUNER_CAP_RDS</code> flags can be set.</p></td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>rangelow</code></em></td><td colspan="2" valign="top">The lowest tunable frequency in
units of 62.5 kHz, or if the <em class="structfield"><code>capability</code></em>
flag <code class="constant">V4L2_TUNER_CAP_LOW</code> is set, in units of 62.5
Hz.</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>rangehigh</code></em></td><td colspan="2" valign="top">The highest tunable frequency in
units of 62.5 kHz, or if the <em class="structfield"><code>capability</code></em>
flag <code class="constant">V4L2_TUNER_CAP_LOW</code> is set, in units of 62.5
Hz.</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>rxsubchans</code></em></td><td colspan="2" valign="top"><p>Some tuners or audio
decoders can determine the received audio subprograms by analyzing
audio carriers, pilot tones or other indicators. To pass this
information drivers set flags defined in <a class="xref" href="re51.html#tuner-rxsubchans" title="Table A.63. Tuner Audio Reception Flags">Table A.63, “Tuner Audio Reception Flags”</a> in this field. For
example:</p></td></tr><tr><td valign="top"> </td><td valign="top"> </td><td valign="top"><code class="constant">V4L2_TUNER_SUB_MONO</code></td><td valign="top">receiving mono audio</td></tr><tr><td valign="top"> </td><td valign="top"> </td><td valign="top"><code class="constant">STEREO | SAP</code></td><td valign="top">receiving stereo audio and a secondary audio
program</td></tr><tr><td valign="top"> </td><td valign="top"> </td><td valign="top"><code class="constant">MONO | STEREO</code></td><td valign="top">receiving mono or stereo audio, the hardware cannot
distinguish</td></tr><tr><td valign="top"> </td><td valign="top"> </td><td valign="top"><code class="constant">LANG1 | LANG2</code></td><td valign="top">receiving bilingual audio</td></tr><tr><td valign="top"> </td><td valign="top"> </td><td valign="top"><code class="constant">MONO | STEREO | LANG1 | LANG2</code></td><td valign="top">receiving mono, stereo or bilingual
audio</td></tr><tr><td valign="top"> </td><td valign="top"> </td><td colspan="2" valign="top"><p>When the
<code class="constant">V4L2_TUNER_CAP_STEREO</code>,
<code class="constant">_LANG1</code>, <code class="constant">_LANG2</code> or
<code class="constant">_SAP</code> flag is cleared in the
<em class="structfield"><code>capability</code></em> field, the corresponding
<code class="constant">V4L2_TUNER_SUB_</code> flag must not be set
here.</p><p>This field is valid only if this is the tuner of the
current video input, or when the structure refers to a radio
tuner.</p></td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>audmode</code></em></td><td colspan="2" valign="top"><p>The selected audio mode, see
<a class="xref" href="re51.html#tuner-audmode" title="Table A.64. Tuner Audio Modes">Table A.64, “Tuner Audio Modes”</a> for valid values. The audio mode does
not affect audio subprogram detection, and like a <a class="link" href="ch01s08.html" title="User Controls">control</a> it does not automatically change
unless the requested mode is invalid or unsupported. See <a class="xref" href="re51.html#tuner-matrix" title="Table A.65. Tuner Audio Matrix">Table A.65, “Tuner Audio Matrix”</a> for possible results when
the selected and received audio programs do not
match.</p><p>Currently this is the only field of struct
<span class="structname">v4l2_tuner</span> applications can
change.</p></td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>signal</code></em></td><td colspan="2" valign="top">The signal strength if known, ranging
from 0 to 65535. Higher values indicate a better signal.</td></tr><tr><td valign="top">__s32</td><td valign="top"><em class="structfield"><code>afc</code></em></td><td colspan="2" valign="top">Automatic frequency control: When the
<em class="structfield"><code>afc</code></em> value is negative, the frequency is too
low, when positive too high.</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>reserved</code></em>[4]</td><td colspan="2" valign="top">Reserved for future extensions. Drivers and
applications must set the array to zero.</td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="v4l2-tuner-type"></a><p class="title"><b>Table A.61. enum v4l2_tuner_type</b></p><div class="table-contents"><table summary="enum v4l2_tuner_type" width="100%" border="0"><colgroup><col /><col /><col /></colgroup><tbody valign="top"><tr><td valign="top"><code class="constant">V4L2_TUNER_RADIO</code></td><td valign="top">1</td><td valign="top"> </td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_ANALOG_TV</code></td><td valign="top">2</td><td valign="top"> </td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="tuner-capability"></a><p class="title"><b>Table A.62. Tuner and Modulator Capability Flags</b></p><div class="table-contents"><table summary="Tuner and Modulator Capability Flags" width="100%" border="0"><colgroup><col /><col /><col /></colgroup><tbody valign="top"><tr><td valign="top"><code class="constant">V4L2_TUNER_CAP_LOW</code></td><td valign="top">0x0001</td><td valign="top">When set, tuning frequencies are expressed in units of
62.5 Hz, otherwise in units of 62.5 kHz.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_CAP_NORM</code></td><td valign="top">0x0002</td><td valign="top">This is a multi-standard tuner; the video standard
can or must be switched. (B/G PAL tuners for example are typically not
considered multi-standard because the video standard is automatically
determined from the frequency band.) The set of supported video
standards is available from the struct <a class="link" href="re31.html#v4l2-input" title="Table A.22. struct v4l2_input">v4l2_input</a> pointing to this tuner,
see the description of ioctl <a class="link" href="re31.html" title="ioctl VIDIOC_ENUMINPUT"><code class="constant">VIDIOC_ENUMINPUT</code></a> for details. Only
<code class="constant">V4L2_TUNER_ANALOG_TV</code> tuners can have this capability.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_CAP_STEREO</code></td><td valign="top">0x0010</td><td valign="top">Stereo audio reception is supported.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_CAP_LANG1</code></td><td valign="top">0x0040</td><td valign="top">Reception of the primary language of a bilingual
audio program is supported. Bilingual audio is a feature of
two-channel systems, transmitting the primary language monaural on the
main audio carrier and a secondary language monaural on a second
carrier. Only
<code class="constant">V4L2_TUNER_ANALOG_TV</code> tuners can have this capability.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_CAP_LANG2</code></td><td valign="top">0x0020</td><td valign="top">Reception of the secondary language of a bilingual
audio program is supported. Only
<code class="constant">V4L2_TUNER_ANALOG_TV</code> tuners can have this capability.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_CAP_SAP</code></td><td valign="top">0x0020</td><td valign="top"><p>Reception of a secondary audio program is
supported. This is a feature of the BTSC system which accompanies the
NTSC video standard. Two audio carriers are available for mono or
stereo transmissions of a primary language, and an independent third
carrier for a monaural secondary language. Only
<code class="constant">V4L2_TUNER_ANALOG_TV</code> tuners can have this capability.</p><p>Note the
<code class="constant">V4L2_TUNER_CAP_LANG2</code> and
<code class="constant">V4L2_TUNER_CAP_SAP</code> flags are synonyms.
<code class="constant">V4L2_TUNER_CAP_SAP</code> applies when the tuner
supports the <code class="constant">V4L2_STD_NTSC_M</code> video
standard.</p></td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_CAP_RDS</code></td><td valign="top">0x0080</td><td valign="top">RDS capture is supported. This capability is only valid for
radio tuners.</td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="tuner-rxsubchans"></a><p class="title"><b>Table A.63. Tuner Audio Reception Flags</b></p><div class="table-contents"><table summary="Tuner Audio Reception Flags" width="100%" border="0"><colgroup><col /><col /><col /></colgroup><tbody valign="top"><tr><td valign="top"><code class="constant">V4L2_TUNER_SUB_MONO</code></td><td valign="top">0x0001</td><td valign="top">The tuner receives a mono audio signal.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_SUB_STEREO</code></td><td valign="top">0x0002</td><td valign="top">The tuner receives a stereo audio signal.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_SUB_LANG1</code></td><td valign="top">0x0008</td><td valign="top">The tuner receives the primary language of a
bilingual audio signal. Drivers must clear this flag when the current
video standard is <code class="constant">V4L2_STD_NTSC_M</code>.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_SUB_LANG2</code></td><td valign="top">0x0004</td><td valign="top">The tuner receives the secondary language of a
bilingual audio signal (or a second audio program).</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_SUB_SAP</code></td><td valign="top">0x0004</td><td valign="top">The tuner receives a Second Audio Program. Note the
<code class="constant">V4L2_TUNER_SUB_LANG2</code> and
<code class="constant">V4L2_TUNER_SUB_SAP</code> flags are synonyms. The
<code class="constant">V4L2_TUNER_SUB_SAP</code> flag applies when the
current video standard is <code class="constant">V4L2_STD_NTSC_M</code>.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_SUB_RDS</code></td><td valign="top">0x0010</td><td valign="top">The tuner receives an RDS channel.</td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="tuner-audmode"></a><p class="title"><b>Table A.64. Tuner Audio Modes</b></p><div class="table-contents"><table summary="Tuner Audio Modes" width="100%" border="0"><colgroup><col /><col /><col /></colgroup><tbody valign="top"><tr><td valign="top"><code class="constant">V4L2_TUNER_MODE_MONO</code></td><td valign="top">0</td><td valign="top">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.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_MODE_STEREO</code></td><td valign="top">1</td><td valign="top"><p>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.</p><p>Playing
different languages in this mode is
deprecated. New drivers should do this only in
<code class="constant">MODE_LANG1_LANG2</code>.</p><p>When the tuner
receives no stereo signal or does not support stereo reception the
driver shall fall back to <code class="constant">MODE_MONO</code>.</p></td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_MODE_LANG1</code></td><td valign="top">3</td><td valign="top">Play the primary language, mono or stereo. Only
<code class="constant">V4L2_TUNER_ANALOG_TV</code> tuners support this
mode.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_MODE_LANG2</code></td><td valign="top">2</td><td valign="top">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
<code class="constant">V4L2_TUNER_ANALOG_TV</code> tuners support this
mode.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_MODE_SAP</code></td><td valign="top">2</td><td valign="top">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
<code class="constant">V4L2_TUNER_ANALOG_TV</code> tuners support this mode.
Note the <code class="constant">V4L2_TUNER_MODE_LANG2</code> and
<code class="constant">V4L2_TUNER_MODE_SAP</code> are synonyms.</td></tr><tr><td valign="top"><code class="constant">V4L2_TUNER_MODE_LANG1_LANG2</code></td><td valign="top">4</td><td valign="top">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
<code class="constant">MODE_LANG1</code> or <code class="constant">MODE_MONO</code>.
Only <code class="constant">V4L2_TUNER_ANALOG_TV</code> tuners support this
mode.</td></tr></tbody></table></div></div><br class="table-break" /><div class="table"><a id="tuner-matrix"></a><p class="title"><b>Table A.65. Tuner Audio Matrix</b></p><div class="table-contents"><table summary="Tuner Audio Matrix" width="100%" border="1"><colgroup><col align="left" /><col align="center" /><col align="center" /><col align="center" /><col /><col align="center" /></colgroup><thead><tr><th align="left"> </th><th colspan="5" align="center">Selected
<code class="constant">V4L2_TUNER_MODE_</code></th></tr><tr><th align="left">Received <code class="constant">V4L2_TUNER_SUB_</code></th><th align="center"><code class="constant">MONO</code></th><th align="center"><code class="constant">STEREO</code></th><th align="center"><code class="constant">LANG1</code></th><th align="center"><code class="constant">LANG2 = SAP</code></th><th align="center"><code class="constant">LANG1_LANG2</code><sup>[<a id="id2916272" href="#ftn.id2916272" class="footnote">a</a>]</sup></th></tr></thead><tbody valign="top"><tr><td align="left" valign="top"><code class="constant">MONO</code></td><td align="center" valign="top">Mono</td><td align="center" valign="top">Mono/Mono</td><td align="center" valign="top">Mono</td><td align="center" valign="top">Mono</td><td align="center" valign="top">Mono/Mono</td></tr><tr><td align="left" valign="top"><code class="constant">MONO | SAP</code></td><td align="center" valign="top">Mono</td><td align="center" valign="top">Mono/Mono</td><td align="center" valign="top">Mono</td><td align="center" valign="top">SAP</td><td align="center" valign="top">Mono/SAP (preferred) or Mono/Mono</td></tr><tr><td align="left" valign="top"><code class="constant">STEREO</code></td><td align="center" valign="top">L+R</td><td align="center" valign="top">L/R</td><td align="center" valign="top">Stereo L/R (preferred) or Mono L+R</td><td align="center" valign="top">Stereo L/R (preferred) or Mono L+R</td><td align="center" valign="top">L/R (preferred) or L+R/L+R</td></tr><tr><td align="left" valign="top"><code class="constant">STEREO | SAP</code></td><td align="center" valign="top">L+R</td><td align="center" valign="top">L/R</td><td align="center" valign="top">Stereo L/R (preferred) or Mono L+R</td><td align="center" valign="top">SAP</td><td align="center" valign="top">L+R/SAP (preferred) or L/R or L+R/L+R</td></tr><tr><td align="left" valign="top"><code class="constant">LANG1 | LANG2</code></td><td align="center" valign="top">Language 1</td><td align="center" valign="top">Lang1/Lang2 (deprecated<sup>[<a id="id2916399" href="#ftn.id2916399" class="footnote">b</a>]</sup>) or
Lang1/Lang1</td><td align="center" valign="top">Language 1</td><td align="center" valign="top">Language 2</td><td align="center" valign="top">Lang1/Lang2 (preferred) or Lang1/Lang1</td></tr></tbody><tbody class="footnotes"><tr><td colspan="6"><div class="footnote"><p><sup>[<a id="ftn.id2916272" href="#id2916272" class="para">a</a>] </sup>This
mode has been added in Linux 2.6.17 and may not be supported by older
drivers.</p></div><div class="footnote"><p><sup>[<a id="ftn.id2916399" href="#id2916399" class="para">b</a>] </sup>Playback of
both languages in <code class="constant">MODE_STEREO</code> is deprecated. In
the future drivers should produce only the primary language in this
mode. Applications should request
<code class="constant">MODE_LANG1_LANG2</code> to record both languages or a
stereo signal.</p></div></td></tr></tbody></table></div></div><br class="table-break" /></div><div class="refsect1" title="Return Value"><a id="id2916434"></a><h2>Return Value</h2><p>On success <span class="returnvalue">0</span> is returned, on error <span class="returnvalue">-1</span> and the <code class="varname">errno</code> variable is set appropriately:</p><div class="variablelist"><dl><dt><span class="term"><span class="errorcode">EINVAL</span></span></dt><dd><p>The struct <a class="link" href="re51.html#v4l2-tuner" title="Table A.60. struct v4l2_tuner">v4l2_tuner</a> <em class="structfield"><code>index</code></em> is
out of bounds.</p></dd></dl></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re50.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="apa.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re52.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ioctl VIDIOC_G_STD, VIDIOC_S_STD </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> ioctl VIDIOC_LOG_STATUS</td></tr></table></div></body></html>
