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Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml b/Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml deleted file mode 100644 index f8dfeed34fca..000000000000 --- a/Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml +++ /dev/null @@ -1,159 +0,0 @@ -<refentry id="vidioc-enum-fmt"> - <refmeta> - <refentrytitle>ioctl VIDIOC_ENUM_FMT</refentrytitle> - &manvol; - </refmeta> - - <refnamediv> - <refname>VIDIOC_ENUM_FMT</refname> - <refpurpose>Enumerate image formats</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_fmtdesc -*<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_FMT</para> - </listitem> - </varlistentry> - <varlistentry> - <term><parameter>argp</parameter></term> - <listitem> - <para></para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> - - <refsect1> - <title>Description</title> - - <para>To enumerate image formats applications initialize the -<structfield>type</structfield> and <structfield>index</structfield> -field of &v4l2-fmtdesc; and call the -<constant>VIDIOC_ENUM_FMT</constant> ioctl with a pointer to this -structure. Drivers fill the rest of the structure or return an -&EINVAL;. All formats are enumerable by beginning at index zero and -incrementing by one until <errorcode>EINVAL</errorcode> is -returned.</para> - - <para>Note that after switching input or output the list of enumerated image -formats may be different.</para> - - <table pgwide="1" frame="none" id="v4l2-fmtdesc"> - <title>struct <structname>v4l2_fmtdesc</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u32</entry> - <entry><structfield>index</structfield></entry> - <entry>Number of the format in the enumeration, set by -the application. This is in no way related to the <structfield> -pixelformat</structfield> field.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>type</structfield></entry> - <entry>Type of the data stream, set by the application. -Only these types are valid here: -<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant>, -<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE</constant>, -<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant>, -<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE</constant> and -<constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>. See <xref linkend="v4l2-buf-type" />.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>flags</structfield></entry> - <entry>See <xref linkend="fmtdesc-flags" /></entry> - </row> - <row> - <entry>__u8</entry> - <entry><structfield>description</structfield>[32]</entry> - <entry>Description of the format, a NUL-terminated ASCII -string. This information is intended for the user, for example: "YUV -4:2:2".</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>pixelformat</structfield></entry> - <entry>The image format identifier. This is a -four character code as computed by the v4l2_fourcc() -macro:</entry> - </row> - <row> - <entry spanname="hspan"><para><programlisting id="v4l2-fourcc"> -#define v4l2_fourcc(a,b,c,d) (((__u32)(a)<<0)|((__u32)(b)<<8)|((__u32)(c)<<16)|((__u32)(d)<<24)) -</programlisting></para><para>Several image formats are already -defined by this specification in <xref linkend="pixfmt" />. Note these -codes are not the same as those used in the Windows world.</para></entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>reserved</structfield>[4]</entry> - <entry>Reserved for future extensions. Drivers must set -the array to zero.</entry> - </row> - </tbody> - </tgroup> - </table> - - <table pgwide="1" frame="none" id="fmtdesc-flags"> - <title>Image Format Description Flags</title> - <tgroup cols="3"> - &cs-def; - <tbody valign="top"> - <row> - <entry><constant>V4L2_FMT_FLAG_COMPRESSED</constant></entry> - <entry>0x0001</entry> - <entry>This is a compressed format.</entry> - </row> - <row> - <entry><constant>V4L2_FMT_FLAG_EMULATED</constant></entry> - <entry>0x0002</entry> - <entry>This format is not native to the device but emulated -through software (usually libv4l2), where possible try to use a native format -instead for better performance.</entry> - </row> - </tbody> - </tgroup> - </table> - </refsect1> - - <refsect1> - &return-value; - - <variablelist> - <varlistentry> - <term><errorcode>EINVAL</errorcode></term> - <listitem> - <para>The &v4l2-fmtdesc; <structfield>type</structfield> -is not supported or the <structfield>index</structfield> is out of -bounds.</para> - </listitem> - </varlistentry> - </variablelist> - </refsect1> -</refentry> |