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<div class="refentry" title="flooper">
<a id="flooper"></a>
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<a id="Indexflooper" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">flooper</span>
</h2>
<p>flooper —
Function-table-based crossfading looper.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp21266952"></a>
<h2>Description</h2>
<p>
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.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp21267864"></a>
<h2>Syntax</h2>
<pre class="synopsis">asig <span class="command"><strong>flooper</strong></span> kamp, kpitch, istart, idur, ifad, ifn</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp21276088"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>istart </em></span> -- loop start pos in seconds
</p>
<p>
<span class="emphasis"><em>idur </em></span> -- loop duration in seconds
</p>
<p>
<span class="emphasis"><em>ifad </em></span> -- crossfade duration in seconds
</p>
<p>
<span class="emphasis"><em>ifn </em></span> -- function table number, generally created using GEN01
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp21278248"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- output sig
</p>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude control </p>
<p>
<span class="emphasis"><em>kpitch</em></span> -- pitch control (transposition ratio); negative values play the loop back in reverse
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp21279968"></a>
<h2>Examples</h2>
<p>
</p>
<div class="example">
<a id="idp21280432"></a>
<p class="title">
<strong>Example 246. </strong>
</p>
<div class="example-contents">
<pre class="programlisting">
aout <span class="opc">flooper</span> 16000, 1, 1, 4, 0.05, 1 <span class="comment">; loop starts at 1 sec, for 4 secs, 0.05 crossfade</span>
<span class="opc">out</span> aout</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
The example above shows the basic operation of <span class="emphasis"><em>flooper</em></span>. 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).
</p>
<p>
Here is another example of the flooper opcode. It uses the file <a class="ulink" href="examples/flooper.csd" target="_top"><em class="citetitle">flooper.csd</em></a> and <a class="ulink" href="examples/fox.wav" target="_top"><em class="citetitle">fox.wav</em></a>.
</p>
<div class="example">
<a id="idp21320184"></a>
<p class="title">
<strong>Example 247. </strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o flooper.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
kpitch <span class="opc">line</span> 1, p3, 4
aout <span class="opc">flooper</span> 26000, kpitch, 1, .53, 0.05, 1 <span class="comment">; loop starts at 1 sec, for .53 secs, 0.05 crossfade</span>
<span class="opc">out</span> aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1: an audio file.</span>
<span class="comment">; Its table size is deferred,</span>
<span class="comment">; and format taken from the soundfile header.</span>
<span class="stamnt">f</span> 1 0 0 1 "beats.wav" 0 0 0
<span class="stamnt">i</span> 1 0 4
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp21322256"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>April 2005 </td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>April 2005.</p>
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distrib
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Mageia
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5
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x86_64
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media
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core-release
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by-pkgid
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b707d9a4ee443103660a75ccb6e51334
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files
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