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<div class="refentry" title="sndloop">
<a id="sndloop"></a>
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<h2>
<span class="refentrytitle">sndloop</span>
</h2>
<p>sndloop —
A sound looper with pitch control.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp43999312"></a>
<h2>Description</h2>
<p>
This opcode records input audio and plays it back in a loop with user-defined
duration and crossfade time. It also allows the pitch of the loop to be controlled,
including reversed playback.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp44000120"></a>
<h2>Syntax</h2>
<pre class="synopsis">asig, krec <span class="command"><strong>sndloop</strong></span> ain, kpitch, ktrig, idur, ifad</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp44045984"></a>
<h2>Initialization</h2>
<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>
</div>
<div class="refsect1" title="Performance">
<a id="idp44047280"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- output sig
</p>
<p>
<span class="emphasis"><em>krec</em></span> -- 'rec on' signal, 1 when recording, 0 otherwise
</p>
<p>
<span class="emphasis"><em>kpitch</em></span> -- pitch control (transposition ratio); negative values play the loop back in reverse
</p>
<p>
<span class="emphasis"><em>ktrig</em></span> -- trigger signal: when 0, processing is bypassed. When switched on (ktrig >= 1),
the opcode starts recording until the loop memory is full. It then plays
the looped sound until it is switched off again (ktrig = 0). Another recording
can start again with ktrig >= 1.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp44049760"></a>
<h2>Examples</h2>
<p>
Here is an example of the sndloop opcode. It uses the file <a class="ulink" href="examples/sndloop.csd" target="_top"><em class="citetitle">sndloop.csd</em></a>.
</p>
<div class="example">
<a id="idp44050736"></a>
<p class="title">
<strong>Example 779. Example of the sndloop opcode.</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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o sndloop.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> 32
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="oblock">instr</span> 1
itrig <span class="op">=</span> p4
asig <span class="opc">diskin2</span> "beats.wav", 1, 0, 1 <span class="comment">;get the signal in, loop it</span>
ktrig <span class="opc">line</span> 0, itrig, 1 <span class="comment">;when to trigger signal = p4</span>
kpitch <span class="opc">line</span> 1.2, p3, .5 <span class="comment">;vary pitch of recorded signal</span>
aout,krec <span class="opc">sndloop</span> asig, kpitch, ktrig, .4, 0.05 <span class="comment">;rec starts at p4 sec, for .4 secs and 0.05 crossfade</span>
<span class="opc">printk2</span> krec <span class="comment">; prints the recording signal</span>
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 5 .5 <span class="comment">;trigger in seconds (=p4)</span>
<span class="stamnt">i</span>1 + 5 .8
<span class="stamnt">i</span>1 + 10 1.2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
The example above shows the basic operation of sndloop. Pitch can
be controlled at the k-rate, recording is started as soon as the
trigger value is >= 1. Recording can be restarted by making the trigger 0 and
then 1 again.
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp44053472"></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 in Version 5.00</p>
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