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<div class="refentry" title="prealloc">
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<h2>
<span class="refentrytitle">prealloc</span>
</h2>
<p>prealloc —
Creates space for instruments but does not run them.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp37032848"></a>
<h2>Description</h2>
<p>
Creates space for instruments but does not run them.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp37033592"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>prealloc</strong></span> insnum, icount</pre>
<pre class="synopsis"><span class="command"><strong>prealloc</strong></span> "insname", icount</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp37044672"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>insnum</em></span> -- instrument number
</p>
<p>
<span class="emphasis"><em>icount</em></span> -- number of instrument allocations
</p>
<p>
<span class="emphasis"><em><span class="quote">“<span class="quote">insname</span>”</span></em></span> -- A string (in double-quotes) representing a named instrument.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp37046688"></a>
<h2>Performance</h2>
<p>
All instances of <span class="emphasis"><em>prealloc</em></span> must be defined in the header section, not in the instrument body.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp37047688"></a>
<h2>Examples</h2>
<p>
Here is an example of the prealloc opcode. It uses the file <a class="ulink" href="examples/prealloc.csd" target="_top"><em class="citetitle">prealloc.csd</em></a>.
</p>
<div class="example">
<a id="idp37083312"></a>
<p class="title">
<strong>Example 612. Example of the prealloc 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>
<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 prealloc.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Pre-allocate memory for five instances of Instrument #1.</span>
<span class="opc">prealloc</span> 1, 5
<span class="comment">; Instrument #1</span>
<span class="oblock">instr</span> 1
<span class="comment">; Generate a waveform, get the cycles per second from the 4th p-field.</span>
a1 <span class="opc">oscil</span> 6500, p4, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Just generate a nice, ordinary sine wave.</span>
<span class="stamnt">f</span> 1 0 32768 10 1
<span class="comment">; Play five instances of Instrument #1 for one second.</span>
<span class="comment">; Note that 4th p-field contains cycles per second.</span>
<span class="stamnt">i</span> 1 0 1 220
<span class="stamnt">i</span> 1 0 1 440
<span class="stamnt">i</span> 1 0 1 880
<span class="stamnt">i</span> 1 0 1 1320
<span class="stamnt">i</span> 1 0 1 1760
<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="See Also">
<a id="idp37085504"></a>
<h2>See Also</h2>
<p>
<a class="link" href="cpuprc.html" title="cpuprc"><em class="citetitle">cpuprc</em></a>, <a class="link" href="maxalloc.html" title="maxalloc"><em class="citetitle">maxalloc</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp37087016"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
<tr>
<td>Italy</td>
</tr>
<tr>
<td>July 1999</td>
</tr>
</table>
<p>
</p>
<p>Example written by Kevin Conder.</p>
<p>New in Csound version 3.57</p>
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