gstreamer/docs/plugins/inspect/plugin-audiotestsrc.xml

<plugin>
  <name>audiotestsrc</name>
  <description>Creates audio test signals of given frequency and volume</description>
  <filename>../../gst/audiotestsrc/.libs/libgstaudiotestsrc.so</filename>
  <basename>libgstaudiotestsrc.so</basename>
  <version>1.4.0</version>
  <license>LGPL</license>
  <source>gst-plugins-base</source>
  <package>GStreamer Base Plug-ins source release</package>
  <origin>Unknown package origin</origin>
  <elements>
    <element>
      <name>audiotestsrc</name>
      <longname>Audio test source</longname>
      <class>Source/Audio</class>
      <description>Creates audio test signals of given frequency and volume</description>
      <author>Stefan Kost &lt;ensonic@users.sf.net&gt;</author>
      <pads>
        <caps>
          <name>src</name>
          <direction>source</direction>
          <presence>always</presence>
          <details>audio/x-raw, format=(string){ S16LE, S32LE, F32LE, F64LE }, layout=(string)interleaved, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2 ]</details>
        </caps>
      </pads>
    </element>
  </elements>
</plugin>