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<refentry id="filenchnls">
<indexterm id="IndexFilechnls"><primary>filenchnls</primary></indexterm>
<refentryinfo><title>Signal I/O:Soundfile Queries</title></refentryinfo>
<refmeta>
<refentrytitle>filenchnls</refentrytitle>
</refmeta>
<refnamediv>
<refname>filenchnls</refname>
<refpurpose>
Returns the number of channels in a sound file.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Returns the number of channels in a sound file.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ir <command>filenchnls</command> ifilcod [, iallowraw]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>ifilcod</emphasis> -- sound file to be queried
</para>
<para>
<emphasis>iallowraw</emphasis> -- (Optional) Allow raw sound files (default=1)
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>filenchnls</emphasis> returns the number of channels in the sound file <emphasis>ifilcod</emphasis>. <emphasis>filechnls</emphasis> can return the number of channels of convolve and PVOC files if the <emphasis>iallowraw</emphasis> flag is not zero (it is non-zero by default).
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the filenchnls opcode. It uses the file <ulink url="examples/filenchnls.csd"><citetitle>filenchnls.csd</citetitle></ulink>,
and <ulink url="examples/mary.wav"><citetitle>mary.wav</citetitle></ulink>.
<example>
<title>Example of the filenchnls opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/filenchnls.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
The audio file <quote>mary.wav</quote> is monoaural (1 channel). So <emphasis>filenchnls</emphasis>'s output should include a line like this:
<screen>
instr 1: ichnls = 1.000
</screen>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="filebit"><citetitle>filebit</citetitle></link>,
<link linkend="filelen"><citetitle>filelen</citetitle></link>,
<link linkend="filepeak"><citetitle>filepeak</citetitle></link>,
<link linkend="filesr"><citetitle>filesr</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namematt;</member>
<member>July 1999</member>
</simplelist>
</para>
<para>Example written by &namekevin;.</para>
<para>New in Csound version 3.57</para>
</refsect1>
</refentry>
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