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<a id="flooper2"></a>
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<a id="Indexflooper2" class="indexterm"></a>
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<h2>
<span class="refentrytitle">flooper2</span>
</h2>
<p>flooper2 —
Function-table-based crossfading looper.
</p>
</div>
<div class="refsect1">
<a id="idm281472935279288"></a>
<h2>Description</h2>
<p>
This opcode implements a crossfading looper with variable loop parameters and three
looping modes, optionally using a table for its crossfade shape. It accepts
non-power-of-two tables for its source sounds, such as deferred-allocation
GEN01 tables, with one or two channels.
</p>
</div>
<div class="refsect1">
<a id="idm281472935277800"></a>
<h2>Syntax</h2>
<pre class="synopsis">asig1[,asig2] <span class="command"><strong>flooper2</strong></span> kamp, kpitch, kloopstart, kloopend, kcrossfade, ifn \
[, istart, imode, ifenv, iskip]</pre>
</div>
<div class="refsect1">
<a id="idm281472935206216"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn </em></span> -- sound source function table number, generally created using GEN01
</p>
<p>
<span class="emphasis"><em>istart </em></span> -- playback start pos in seconds
</p>
<p>
<span class="emphasis"><em>imode </em></span> -- loop modes: 0 forward, 1 backward, 2 back-and-forth [def: 0]
</p>
<p>
<span class="emphasis"><em>ifenv </em></span> -- if non-zero, crossfade envelope shape table number. The default, 0, sets
the crossfade to linear.
</p>
<p>
<span class="emphasis"><em>iskip </em></span> -- if 1, the opcode initialisation is skipped, for tied notes, performance
continues from the position in the loop where the previous note stopped. The default, 0, does not skip
initialisation
</p>
</div>
<div class="refsect1">
<a id="idm281472935201128"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig1[, asig2]</em></span> -- output sig (mono or stereo).
</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 are not allowed.
</p>
<p>
<span class="emphasis"><em>kloopstart</em></span> -- loop start point (secs). Note that although k-rate, loop parameters
such as this are only updated once per loop cycle.
</p>
<p>
<span class="emphasis"><em>kloopend</em></span> -- loop end point (secs), updated once per loop cycle.
</p>
<p>
<span class="emphasis"><em>kcrossfade </em></span> -- crossfade length (secs), updated once per loop cycle and limited to
loop length.</p>
<p>
Mode 1 for <span class="emphasis"><em>imode </em></span> will only loop backwards from the end point to the start point.
</p>
</div>
<div class="refsect1">
<a id="idm281472935194120"></a>
<h2>Examples</h2>
<p>
</p>
<div class="example">
<a id="idm281472935193192"></a>
<p class="title">
<strong>Example 296. </strong>
</p>
<div class="example-contents">
<pre class="programlisting">
aout <span class="opc">flooper2</span> 16000, 1, 1, 5, 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>flooper2</em></span>. Pitch can
be controlled at the k-rate, as well as amplitude and loop parameters.
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). Looping is in mode 0 (normal forward loop).
</p>
<p>
Here is another example of the flooper2 opcode. It uses the file <a class="ulink" href="examples/flooper2.csd" target="_top"><em class="citetitle">flooper2.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="idm281472935186680"></a>
<p class="title">
<strong>Example 297. </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>
<div class="refsect1">
<a id="idm281472767862568"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o flooper2.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="c1">; looping back and forth, 0.05 crossfade </span>
k<span class="n">st</span> <span class="nb">line</span> <span class="mf">.2</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">2</span> <span class="c1">;vary loopstartpoint</span>
a<span class="n">out</span> <span class="nb">flooper2</span> <span class="mf">.8</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> k<span class="n">st</span><span class="p">,</span> <span class="mf">0.05</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; Its table size is deferred,</span>
<span class="c1">; and format taken from the soundfile header</span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">1</span> <span class="s">"fox.wav"</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">12</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472935182824"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>July 2006 </td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>July 2006.</p>
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