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Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml')
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1 files changed, 0 insertions, 175 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml b/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml deleted file mode 100644 index a0608ab..0000000 --- a/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml +++ /dev/null @@ -1,175 +0,0 @@ -<refentry id="vidioc-enum-freq-bands"> - <refmeta> - <refentrytitle>ioctl VIDIOC_ENUM_FREQ_BANDS</refentrytitle> - &manvol; - </refmeta> - - <refnamediv> - <refname>VIDIOC_ENUM_FREQ_BANDS</refname> - <refpurpose>Enumerate supported frequency bands</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <funcsynopsis> - <funcprototype> - <funcdef>int <function>ioctl</function></funcdef> - <paramdef>int <parameter>fd</parameter></paramdef> - <paramdef>int <parameter>request</parameter></paramdef> - <paramdef>struct v4l2_frequency_band -*<parameter>argp</parameter></paramdef> - </funcprototype> - </funcsynopsis> - </refsynopsisdiv> - - <refsect1> - <title>Arguments</title> - - <variablelist> - <varlistentry> - <term><parameter>fd</parameter></term> - <listitem> - <para>&fd;</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>request</parameter></term> - <listitem> - <para>VIDIOC_ENUM_FREQ_BANDS</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>argp</parameter></term> - <listitem> - <para></para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> - - <refsect1> - <title>Description</title> - - <para>Enumerates the frequency bands that a tuner or modulator supports. -To do this applications initialize the <structfield>tuner</structfield>, -<structfield>type</structfield> and <structfield>index</structfield> fields, -and zero out the <structfield>reserved</structfield> array of a &v4l2-frequency-band; and -call the <constant>VIDIOC_ENUM_FREQ_BANDS</constant> ioctl with a pointer -to this structure.</para> - - <para>This ioctl is supported if the <constant>V4L2_TUNER_CAP_FREQ_BANDS</constant> capability - of the corresponding tuner/modulator is set.</para> - - <table pgwide="1" frame="none" id="v4l2-frequency-band"> - <title>struct <structname>v4l2_frequency_band</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u32</entry> - <entry><structfield>tuner</structfield></entry> - <entry>The tuner or modulator index number. This is the -same value as in the &v4l2-input; <structfield>tuner</structfield> -field and the &v4l2-tuner; <structfield>index</structfield> field, or -the &v4l2-output; <structfield>modulator</structfield> field and the -&v4l2-modulator; <structfield>index</structfield> field.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>type</structfield></entry> - <entry>The tuner type. This is the same value as in the -&v4l2-tuner; <structfield>type</structfield> field. The type must be set -to <constant>V4L2_TUNER_RADIO</constant> for <filename>/dev/radioX</filename> -device nodes, and to <constant>V4L2_TUNER_ANALOG_TV</constant> -for all others. Set this field to <constant>V4L2_TUNER_RADIO</constant> for -modulators (currently only radio modulators are supported). -See <xref linkend="v4l2-tuner-type" /></entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>index</structfield></entry> - <entry>Identifies the frequency band, set by the application.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>capability</structfield></entry> - <entry spanname="hspan">The tuner/modulator capability flags for -this frequency band, see <xref linkend="tuner-capability" />. The <constant>V4L2_TUNER_CAP_LOW</constant> -or <constant>V4L2_TUNER_CAP_1HZ</constant> capability must be the same for all frequency bands of the selected tuner/modulator. -So either all bands have that capability set, or none of them have that capability.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>rangelow</structfield></entry> - <entry spanname="hspan">The lowest tunable frequency in -units of 62.5 kHz, or if the <structfield>capability</structfield> -flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 -Hz, for this frequency band. A 1 Hz unit is used when the <structfield>capability</structfield> flag -<constant>V4L2_TUNER_CAP_1HZ</constant> is set.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>rangehigh</structfield></entry> - <entry spanname="hspan">The highest tunable frequency in -units of 62.5 kHz, or if the <structfield>capability</structfield> -flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 -Hz, for this frequency band. A 1 Hz unit is used when the <structfield>capability</structfield> flag -<constant>V4L2_TUNER_CAP_1HZ</constant> is set.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>modulation</structfield></entry> - <entry spanname="hspan">The supported modulation systems of this frequency band. - See <xref linkend="band-modulation" />. Note that currently only one - modulation system per frequency band is supported. More work will need to - be done if multiple modulation systems are possible. Contact the - linux-media mailing list (&v4l-ml;) if you need that functionality.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>reserved</structfield>[9]</entry> - <entry>Reserved for future extensions. Applications and drivers - must set the array to zero.</entry> - </row> - </tbody> - </tgroup> - </table> - - <table pgwide="1" frame="none" id="band-modulation"> - <title>Band Modulation Systems</title> - <tgroup cols="3"> - &cs-def; - <tbody valign="top"> - <row> - <entry><constant>V4L2_BAND_MODULATION_VSB</constant></entry> - <entry>0x02</entry> - <entry>Vestigial Sideband modulation, used for analog TV.</entry> - </row> - <row> - <entry><constant>V4L2_BAND_MODULATION_FM</constant></entry> - <entry>0x04</entry> - <entry>Frequency Modulation, commonly used for analog radio.</entry> - </row> - <row> - <entry><constant>V4L2_BAND_MODULATION_AM</constant></entry> - <entry>0x08</entry> - <entry>Amplitude Modulation, commonly used for analog radio.</entry> - </row> - </tbody> - </tgroup> - </table> - </refsect1> - - <refsect1> - &return-value; - - <variablelist> - <varlistentry> - <term><errorcode>EINVAL</errorcode></term> - <listitem> - <para>The <structfield>tuner</structfield> or <structfield>index</structfield> -is out of bounds or the <structfield>type</structfield> field is wrong.</para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> -</refentry> |
