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<refentry id="flooper">
<indexterm id="Indexflooper"><primary>flooper</primary></indexterm>
<refentryinfo><title>Signal Generators:Sample Playback</title></refentryinfo>
<refmeta>
<refentrytitle>flooper</refentrytitle>
</refmeta>
<refnamediv>
<refname>flooper</refname>
<refpurpose>
Function-table-based crossfading looper.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
This opcode reads audio from a function table and plays it back in a loop with user-defined
start time, duration and crossfade time. It also allows the pitch of the loop to be controlled,
including reversed playback. It accepts non-power-of-two tables, such as deferred-allocation
GEN01 tables.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>asig <command>flooper</command> kamp, kpitch, istart, idur, ifad, ifn</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>istart </emphasis> -- loop start pos in seconds
</para>
<para>
<emphasis>idur </emphasis> -- loop duration in seconds
</para>
<para>
<emphasis>ifad </emphasis> -- crossfade duration in seconds
</para>
<para>
<emphasis>ifn </emphasis> -- function table number, generally created using GEN01
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>asig</emphasis> -- output sig
</para>
<para>
<emphasis>kamp</emphasis> -- amplitude control </para>
<para>
<emphasis>kpitch</emphasis> -- pitch control (transposition ratio); negative values play the loop back in reverse
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
<example>
<programlisting>
aout <emphasis role="opc">flooper</emphasis> 16000, 1, 1, 4, 0.05, 1 <emphasis role="comment">; loop starts at 1 sec, for 4 secs, 0.05 crossfade</emphasis>
<emphasis role="opc">out</emphasis> aout</programlisting>
</example>
</para>
<para>
The example above shows the basic operation of <emphasis>flooper</emphasis>. Pitch can
be controlled at the k-rate, as well as amplitude. The example assumes
table 1 to contain at least 5.05 seconds of audio (4 secs loop duration,
starting 1 sec into the table, using 0.05 secs after the loop end for the
crossfade).
</para>
<para>
Here is another example of the flooper opcode. It uses the file <ulink url="examples/flooper.csd"><citetitle>flooper.csd</citetitle></ulink> and <ulink url="examples/fox.wav"><citetitle>fox.wav</citetitle></ulink>.
<example>
<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/flooper.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namevictor;</member>
<member>April 2005 </member>
</simplelist>
</para>
<para>New plugin in version 5</para>
<para>April 2005.</para>
</refsect1>
</refentry>
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