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Mauro Carvalho Chehab
8ed8c88c46
Both revision and group_id fields were never used and were always initialized to zero. Remove them. Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
285 lines
9.1 KiB
XML
285 lines
9.1 KiB
XML
<refentry id="media-ioc-enum-entities">
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<refmeta>
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<refentrytitle>ioctl MEDIA_IOC_ENUM_ENTITIES</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>MEDIA_IOC_ENUM_ENTITIES</refname>
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<refpurpose>Enumerate entities and their properties</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 media_entity_desc *<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>File descriptor returned by
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<link linkend='media-func-open'><function>open()</function></link>.</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>MEDIA_IOC_ENUM_ENTITIES</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 an entity, applications set the id field
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of a &media-entity-desc; structure and call the MEDIA_IOC_ENUM_ENTITIES
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ioctl with a pointer to this structure. The driver fills the rest of the
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structure or returns an &EINVAL; when the id is invalid.</para>
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<para>Entities can be enumerated by or'ing the id with the
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<constant>MEDIA_ENT_ID_FLAG_NEXT</constant> flag. The driver will return
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information about the entity with the smallest id strictly larger than the
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requested one ('next entity'), or the &EINVAL; if there is none.</para>
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<para>Entity IDs can be non-contiguous. Applications must
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<emphasis>not</emphasis> try to enumerate entities by calling
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MEDIA_IOC_ENUM_ENTITIES with increasing id's until they get an error.</para>
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<table pgwide="1" frame="none" id="media-entity-desc">
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<title>struct <structname>media_entity_desc</structname></title>
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<tgroup cols="5">
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<colspec colname="c1" />
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<colspec colname="c2" />
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<colspec colname="c3" />
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<colspec colname="c4" />
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<colspec colname="c5" />
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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>id</structfield></entry>
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<entry></entry>
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<entry></entry>
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<entry>Entity id, set by the application. When the id is or'ed with
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<constant>MEDIA_ENT_ID_FLAG_NEXT</constant>, the driver clears the
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flag and returns the first entity with a larger id.</entry>
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</row>
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<row>
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<entry>char</entry>
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<entry><structfield>name</structfield>[32]</entry>
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<entry></entry>
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<entry></entry>
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<entry>Entity name as an UTF-8 NULL-terminated string.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>type</structfield></entry>
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<entry></entry>
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<entry></entry>
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<entry>Entity type, see <xref linkend="media-entity-type" /> for details.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>revision</structfield></entry>
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<entry></entry>
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<entry></entry>
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<entry>Entity revision. Always zero (obsolete)</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>flags</structfield></entry>
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<entry></entry>
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<entry></entry>
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<entry>Entity flags, see <xref linkend="media-entity-flag" /> for details.</entry>
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</row>
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<row>
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<entry>__u32</entry>
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<entry><structfield>group_id</structfield></entry>
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<entry></entry>
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<entry></entry>
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<entry>Entity group ID. Always zero (obsolete)</entry>
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</row>
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<row>
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<entry>__u16</entry>
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<entry><structfield>pads</structfield></entry>
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<entry></entry>
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<entry></entry>
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<entry>Number of pads</entry>
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</row>
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<row>
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<entry>__u16</entry>
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<entry><structfield>links</structfield></entry>
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<entry></entry>
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<entry></entry>
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<entry>Total number of outbound links. Inbound links are not counted
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in this field.</entry>
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</row>
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<row>
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<entry>union</entry>
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</row>
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<row>
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<entry></entry>
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<entry>struct</entry>
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<entry><structfield>dev</structfield></entry>
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<entry></entry>
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<entry>Valid for (sub-)devices that create a single device node.</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>__u32</entry>
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<entry><structfield>major</structfield></entry>
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<entry>Device node major number.</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>__u32</entry>
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<entry><structfield>minor</structfield></entry>
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<entry>Device node minor number.</entry>
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</row>
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<row>
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<entry></entry>
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<entry>__u8</entry>
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<entry><structfield>raw</structfield>[184]</entry>
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<entry></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 frame="none" pgwide="1" id="media-entity-type">
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<title>Media entity types</title>
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<tgroup cols="2">
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<colspec colname="c1"/>
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<colspec colname="c2"/>
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<tbody valign="top">
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<row>
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<entry><constant>MEDIA_ENT_F_UNKNOWN</constant> and <constant>MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN</constant></entry>
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<entry>Unknown entity. That generally indicates that
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a driver didn't initialize properly the entity, with is a Kernel bug</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_IO_V4L</constant></entry>
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<entry>Data streaming input and/or output entity.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_IO_VBI</constant></entry>
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<entry>V4L VBI streaming input or output entity</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_IO_SWRADIO</constant></entry>
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<entry>V4L Software Digital Radio (SDR) streaming input or output entity</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_IO_DTV</constant></entry>
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<entry>DVB Digital TV streaming input or output entity</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_DTV_DEMOD</constant></entry>
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<entry>Digital TV demodulator entity.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_MPEG_TS_DEMUX</constant></entry>
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<entry>MPEG Transport stream demux entity. Could be implemented on hardware or in Kernelspace by the Linux DVB subsystem.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_DTV_CA</constant></entry>
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<entry>Digital TV Conditional Access module (CAM) entity</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_DTV_NET_DECAP</constant></entry>
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<entry>Digital TV network ULE/MLE desencapsulation entity. Could be implemented on hardware or in Kernelspace</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_CONN_RF</constant></entry>
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<entry>Connector for a Radio Frequency (RF) signal.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_CONN_SVIDEO</constant></entry>
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<entry>Connector for a S-Video signal.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_CONN_COMPOSITE</constant></entry>
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<entry>Connector for a RGB composite signal.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_CONN_TEST</constant></entry>
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<entry>Connector for a test generator.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_CAM_SENSOR</constant></entry>
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<entry>Camera video sensor entity.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_FLASH</constant></entry>
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<entry>Flash controller entity.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_LENS</constant></entry>
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<entry>Lens controller entity.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_ATV_DECODER</constant></entry>
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<entry>Analog video decoder, the basic function of the video decoder
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is to accept analogue video from a wide variety of sources such as
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broadcast, DVD players, cameras and video cassette recorders, in
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either NTSC, PAL, SECAM or HD format, separating the stream
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into its component parts, luminance and chrominance, and output
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it in some digital video standard, with appropriate timing
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signals.</entry>
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</row>
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<row>
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<entry><constant>MEDIA_ENT_F_TUNER</constant></entry>
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<entry>Digital TV, analog TV, radio and/or software radio tuner.</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 frame="none" pgwide="1" id="media-entity-flag">
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<title>Media entity flags</title>
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<tgroup cols="2">
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<colspec colname="c1"/>
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<colspec colname="c2"/>
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<tbody valign="top">
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<row>
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<entry><constant>MEDIA_ENT_FL_DEFAULT</constant></entry>
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<entry>Default entity for its type. Used to discover the default
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audio, VBI and video devices, the default camera sensor, ...</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 &media-entity-desc; <structfield>id</structfield> references
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a non-existing entity.</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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