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535 lines
19 KiB
535 lines
19 KiB
<refentry id="vidioc-g-tuner">
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<refmeta>
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<refentrytitle>ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>VIDIOC_G_TUNER</refname>
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<refname>VIDIOC_S_TUNER</refname>
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<refpurpose>Get or set tuner attributes</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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<paramdef>struct v4l2_tuner
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*<parameter>argp</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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<paramdef>const struct v4l2_tuner
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*<parameter>argp</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Arguments</title>
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<variablelist>
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<varlistentry>
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<term><parameter>fd</parameter></term>
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<listitem>
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<para>&fd;</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>request</parameter></term>
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<listitem>
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<para>VIDIOC_G_TUNER, VIDIOC_S_TUNER</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>argp</parameter></term>
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<listitem>
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<para></para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>To query the attributes of a tuner applications initialize the
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<structfield>index</structfield> field and zero out the
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<structfield>reserved</structfield> array of a &v4l2-tuner; and call the
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<constant>VIDIOC_G_TUNER</constant> ioctl with a pointer to this
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structure. Drivers fill the rest of the structure or return an
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&EINVAL; when the index is out of bounds. To enumerate all tuners
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applications shall begin at index zero, incrementing by one until the
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driver returns <errorcode>EINVAL</errorcode>.</para>
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<para>Tuners have two writable properties, the audio mode and
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the radio frequency. To change the audio mode, applications initialize
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the <structfield>index</structfield>,
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<structfield>audmode</structfield> and
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<structfield>reserved</structfield> fields and call the
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<constant>VIDIOC_S_TUNER</constant> ioctl. This will
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<emphasis>not</emphasis> change the current tuner, which is determined
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by the current video input. Drivers may choose a different audio mode
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if the requested mode is invalid or unsupported. Since this is a
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<!-- FIXME -->write-only ioctl, it does not return the actually
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selected audio mode.</para>
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<para>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl
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is available.</para>
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<table pgwide="1" frame="none" id="v4l2-tuner">
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<title>struct <structname>v4l2_tuner</structname></title>
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<tgroup cols="3">
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<colspec colname="c1" colwidth="1*" />
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<colspec colname="c2" colwidth="1*" />
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<colspec colname="c3" colwidth="1*" />
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<colspec colname="c4" colwidth="1*" />
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<spanspec spanname="hspan" namest="c3" nameend="c4" />
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<tbody valign="top">
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<row>
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<entry>__u32</entry>
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<entry><structfield>index</structfield></entry>
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<entry spanname="hspan">Identifies the tuner, set by the
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application.</entry>
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</row>
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<row>
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<entry>__u8</entry>
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<entry><structfield>name</structfield>[32]</entry>
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<entry spanname="hspan"><para>Name of the tuner, a
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NUL-terminated ASCII string. This information is intended for the
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user.<!-- FIXME Video inputs already have a name, the purpose of this
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field is not quite clear.--></para></entry>
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</row>
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<row>
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<entry>&v4l2-tuner-type;</entry>
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<entry><structfield>type</structfield></entry>
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<entry spanname="hspan">Type of the tuner, see <xref
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linkend="v4l2-tuner-type" />.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>capability</structfield></entry>
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<entry spanname="hspan"><para>Tuner capability flags, see
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<xref linkend="tuner-capability" />. Audio flags indicate the ability
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to decode audio subprograms. They will <emphasis>not</emphasis>
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change, for example with the current video standard.</para><para>When
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the structure refers to a radio tuner only the
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<constant>V4L2_TUNER_CAP_LOW</constant>,
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<constant>V4L2_TUNER_CAP_STEREO</constant> and
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<constant>V4L2_TUNER_CAP_RDS</constant> flags can be set.</para></entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>rangelow</structfield></entry>
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<entry spanname="hspan">The lowest tunable frequency in
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units of 62.5 kHz, or if the <structfield>capability</structfield>
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flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5
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Hz.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>rangehigh</structfield></entry>
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<entry spanname="hspan">The highest tunable frequency in
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units of 62.5 kHz, or if the <structfield>capability</structfield>
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flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5
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Hz.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>rxsubchans</structfield></entry>
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<entry spanname="hspan"><para>Some tuners or audio
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decoders can determine the received audio subprograms by analyzing
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audio carriers, pilot tones or other indicators. To pass this
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information drivers set flags defined in <xref
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linkend="tuner-rxsubchans" /> in this field. For
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example:</para></entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry>
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<entry><constant>V4L2_TUNER_SUB_MONO</constant></entry>
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<entry>receiving mono audio</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry>
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<entry><constant>STEREO | SAP</constant></entry>
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<entry>receiving stereo audio and a secondary audio
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program</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry>
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<entry><constant>MONO | STEREO</constant></entry>
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<entry>receiving mono or stereo audio, the hardware cannot
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distinguish</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry>
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<entry><constant>LANG1 | LANG2</constant></entry>
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<entry>receiving bilingual audio</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry>
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<entry><constant>MONO | STEREO | LANG1 | LANG2</constant></entry>
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<entry>receiving mono, stereo or bilingual
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audio</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry>
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<entry spanname="hspan"><para>When the
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<constant>V4L2_TUNER_CAP_STEREO</constant>,
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<constant>_LANG1</constant>, <constant>_LANG2</constant> or
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<constant>_SAP</constant> flag is cleared in the
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<structfield>capability</structfield> field, the corresponding
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<constant>V4L2_TUNER_SUB_</constant> flag must not be set
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here.</para><para>This field is valid only if this is the tuner of the
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current video input, or when the structure refers to a radio
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tuner.</para></entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>audmode</structfield></entry>
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<entry spanname="hspan"><para>The selected audio mode, see
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<xref linkend="tuner-audmode" /> for valid values. The audio mode does
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not affect audio subprogram detection, and like a <link
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linkend="control">control</link> it does not automatically change
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unless the requested mode is invalid or unsupported. See <xref
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linkend="tuner-matrix" /> for possible results when
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the selected and received audio programs do not
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match.</para><para>Currently this is the only field of struct
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<structname>v4l2_tuner</structname> applications can
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change.</para></entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>signal</structfield></entry>
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<entry spanname="hspan">The signal strength if known, ranging
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from 0 to 65535. Higher values indicate a better signal.</entry>
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</row>
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<row>
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<entry>__s32</entry>
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<entry><structfield>afc</structfield></entry>
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<entry spanname="hspan">Automatic frequency control: When the
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<structfield>afc</structfield> value is negative, the frequency is too
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low, when positive too high.<!-- FIXME need example what to do when it never
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settles at zero, &ie; range is what? --></entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>reserved</structfield>[4]</entry>
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<entry spanname="hspan">Reserved for future extensions. Drivers and
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applications must set the array to zero.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table pgwide="1" frame="none" id="v4l2-tuner-type">
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<title>enum v4l2_tuner_type</title>
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<tgroup cols="3">
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&cs-def;
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_TUNER_RADIO</constant></entry>
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<entry>1</entry>
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<entry></entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_ANALOG_TV</constant></entry>
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<entry>2</entry>
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<entry></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table pgwide="1" frame="none" id="tuner-capability">
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<title>Tuner and Modulator Capability Flags</title>
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<tgroup cols="3">
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&cs-def;
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_TUNER_CAP_LOW</constant></entry>
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<entry>0x0001</entry>
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<entry>When set, tuning frequencies are expressed in units of
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62.5 Hz, otherwise in units of 62.5 kHz.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_CAP_NORM</constant></entry>
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<entry>0x0002</entry>
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<entry>This is a multi-standard tuner; the video standard
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can or must be switched. (B/G PAL tuners for example are typically not
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considered 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 &v4l2-input; pointing to this tuner,
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see the description of ioctl &VIDIOC-ENUMINPUT; for details. Only
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<constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_CAP_STEREO</constant></entry>
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<entry>0x0010</entry>
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<entry>Stereo audio reception is supported.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_CAP_LANG1</constant></entry>
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<entry>0x0040</entry>
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<entry>Reception of the primary language of a bilingual
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audio program is supported. Bilingual audio is a feature of
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two-channel systems, transmitting the primary language monaural on the
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main audio carrier and a secondary language monaural on a second
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carrier. Only
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<constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_CAP_LANG2</constant></entry>
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<entry>0x0020</entry>
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<entry>Reception of the secondary language of a bilingual
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audio program is supported. Only
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<constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_CAP_SAP</constant></entry>
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<entry>0x0020</entry>
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<entry><para>Reception of a secondary audio program is
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supported. This is a feature of the BTSC system which accompanies the
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NTSC video standard. Two audio carriers are available for mono or
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stereo transmissions of a primary language, and an independent third
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carrier for a monaural secondary language. Only
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<constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</para><para>Note the
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<constant>V4L2_TUNER_CAP_LANG2</constant> and
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<constant>V4L2_TUNER_CAP_SAP</constant> flags are synonyms.
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<constant>V4L2_TUNER_CAP_SAP</constant> applies when the tuner
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supports the <constant>V4L2_STD_NTSC_M</constant> video
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standard.</para><!-- FIXME what if PAL+NTSC and Bi but not SAP? --></entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_CAP_RDS</constant></entry>
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<entry>0x0080</entry>
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<entry>RDS capture is supported. This capability is only valid for
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radio tuners.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table pgwide="1" frame="none" id="tuner-rxsubchans">
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<title>Tuner Audio Reception Flags</title>
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<tgroup cols="3">
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&cs-def;
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_TUNER_SUB_MONO</constant></entry>
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<entry>0x0001</entry>
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<entry>The tuner receives a mono audio signal.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_SUB_STEREO</constant></entry>
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<entry>0x0002</entry>
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<entry>The tuner receives a stereo audio signal.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_SUB_LANG1</constant></entry>
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<entry>0x0008</entry>
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<entry>The tuner receives the primary language of a
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bilingual audio signal. Drivers must clear this flag when the current
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video standard is <constant>V4L2_STD_NTSC_M</constant>.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_SUB_LANG2</constant></entry>
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<entry>0x0004</entry>
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<entry>The tuner receives the secondary language of a
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bilingual audio signal (or a second audio program).</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_SUB_SAP</constant></entry>
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<entry>0x0004</entry>
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<entry>The tuner receives a Second Audio Program. Note the
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<constant>V4L2_TUNER_SUB_LANG2</constant> and
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<constant>V4L2_TUNER_SUB_SAP</constant> flags are synonyms. The
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<constant>V4L2_TUNER_SUB_SAP</constant> flag applies when the
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current video standard is <constant>V4L2_STD_NTSC_M</constant>.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_SUB_RDS</constant></entry>
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<entry>0x0010</entry>
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<entry>The tuner receives an RDS channel.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table pgwide="1" frame="none" id="tuner-audmode">
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<title>Tuner Audio Modes</title>
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<tgroup cols="3">
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&cs-def;
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_TUNER_MODE_MONO</constant></entry>
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<entry>0</entry>
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<entry>Play mono audio. When the tuner receives a stereo
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signal this a down-mix of the left and right channel. When the tuner
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receives a bilingual or SAP signal this mode selects the primary
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language.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_MODE_STEREO</constant></entry>
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<entry>1</entry>
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<entry><para>Play stereo audio. When the tuner receives
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bilingual audio it may play different languages on the left and right
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channel or the primary language is played on both channels.</para><para>Playing
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different languages in this mode is
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deprecated. New drivers should do this only in
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<constant>MODE_LANG1_LANG2</constant>.</para><para>When the tuner
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receives no stereo signal or does not support stereo reception the
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driver shall fall back to <constant>MODE_MONO</constant>.</para></entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_MODE_LANG1</constant></entry>
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<entry>3</entry>
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<entry>Play the primary language, mono or stereo. Only
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<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this
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mode.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_MODE_LANG2</constant></entry>
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<entry>2</entry>
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<entry>Play the secondary language, mono. When the tuner
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receives no bilingual audio or SAP, or their reception is not
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supported the driver shall fall back to mono or stereo mode. Only
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<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this
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mode.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_MODE_SAP</constant></entry>
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<entry>2</entry>
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<entry>Play the Second Audio Program. When the tuner
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receives no bilingual audio or SAP, or their reception is not
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supported the driver shall fall back to mono or stereo mode. Only
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<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this mode.
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Note the <constant>V4L2_TUNER_MODE_LANG2</constant> and
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<constant>V4L2_TUNER_MODE_SAP</constant> are synonyms.</entry>
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</row>
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<row>
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<entry><constant>V4L2_TUNER_MODE_LANG1_LANG2</constant></entry>
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<entry>4</entry>
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<entry>Play the primary language on the left channel, the
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secondary language on the right channel. When the tuner receives no
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bilingual audio or SAP, it shall fall back to
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<constant>MODE_LANG1</constant> or <constant>MODE_MONO</constant>.
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Only <constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this
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mode.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<table pgwide="1" frame="all" id="tuner-matrix">
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<title>Tuner Audio Matrix</title>
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<tgroup cols="6" align="center">
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<colspec align="left" />
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<colspec colname="c2" colwidth="1*" />
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<colspec colwidth="1*" />
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<colspec colwidth="1*" />
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<colspec colnum="6" colname="c6" colwidth="1*" />
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<spanspec namest="c2" nameend="c6" spanname="hspan" align="center" />
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<thead>
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<row>
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<entry></entry>
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<entry spanname="hspan">Selected
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<constant>V4L2_TUNER_MODE_</constant></entry>
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</row>
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<row>
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<entry>Received <constant>V4L2_TUNER_SUB_</constant></entry>
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<entry><constant>MONO</constant></entry>
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<entry><constant>STEREO</constant></entry>
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<entry><constant>LANG1</constant></entry>
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<entry><constant>LANG2 = SAP</constant></entry>
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<entry><constant>LANG1_LANG2</constant><footnote><para>This
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mode has been added in Linux 2.6.17 and may not be supported by older
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drivers.</para></footnote></entry>
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</row>
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</thead>
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<tbody valign="top">
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<row>
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<entry><constant>MONO</constant></entry>
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<entry>Mono</entry>
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<entry>Mono/Mono</entry>
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<entry>Mono</entry>
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<entry>Mono</entry>
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<entry>Mono/Mono</entry>
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</row>
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<row>
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<entry><constant>MONO | SAP</constant></entry>
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<entry>Mono</entry>
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<entry>Mono/Mono</entry>
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<entry>Mono</entry>
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<entry>SAP</entry>
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<entry>Mono/SAP (preferred) or Mono/Mono</entry>
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</row>
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<row>
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<entry><constant>STEREO</constant></entry>
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<entry>L+R</entry>
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<entry>L/R</entry>
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<entry>Stereo L/R (preferred) or Mono L+R</entry>
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<entry>Stereo L/R (preferred) or Mono L+R</entry>
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<entry>L/R (preferred) or L+R/L+R</entry>
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</row>
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<row>
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<entry><constant>STEREO | SAP</constant></entry>
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<entry>L+R</entry>
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<entry>L/R</entry>
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<entry>Stereo L/R (preferred) or Mono L+R</entry>
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<entry>SAP</entry>
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<entry>L+R/SAP (preferred) or L/R or L+R/L+R</entry>
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</row>
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<row>
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<entry><constant>LANG1 | LANG2</constant></entry>
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<entry>Language 1</entry>
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<entry>Lang1/Lang2 (deprecated<footnote><para>Playback of
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both languages in <constant>MODE_STEREO</constant> is deprecated. In
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the future drivers should produce only the primary language in this
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mode. Applications should request
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<constant>MODE_LANG1_LANG2</constant> to record both languages or a
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stereo signal.</para></footnote>) or
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Lang1/Lang1</entry>
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<entry>Language 1</entry>
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<entry>Language 2</entry>
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<entry>Lang1/Lang2 (preferred) or Lang1/Lang1</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect1>
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<refsect1>
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&return-value;
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<variablelist>
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<varlistentry>
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<term><errorcode>EINVAL</errorcode></term>
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<listitem>
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<para>The &v4l2-tuner; <structfield>index</structfield> is
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out of bounds.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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</refentry>
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