<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>prealloc</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" /> <link rel="prev" href="powoftwo.html" title="powoftwo" /> <link rel="next" href="prepiano.html" title="prepiano" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">prealloc</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="powoftwo.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="prepiano.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="prealloc"></a> <div class="titlepage"></div> <a id="IndexPrealloc" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">prealloc</span> </h2> <p>prealloc — Creates space for instruments but does not run them. </p> </div> <div class="refsect1"> <a id="idm281472902320328"></a> <h2>Description</h2> <p> Creates space for instruments but does not run them. </p> </div> <div class="refsect1"> <a id="idm281472902316680"></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"> <a id="idm281472902240456"></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"> <a id="idm281472902236840"></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"> <a id="idm281472902235000"></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="idm281472902233224"></a> <p class="title"> <strong>Example 714. 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> <div class="refsect1"> <a id="idm281472723985528"></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> <span class="c1">; Audio out Audio in No messages</span> -odac -iadc -d <span class="c1">;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o prealloc.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="c1">; Initialize the global variables.</span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">; Pre-allocate memory for five instances of Instrument #1.</span> <span class="nb">prealloc</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">5</span> <span class="c1">; Instrument #1</span> <span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; Generate a waveform, get the cycles per second from the 4th p-field.</span> a<span class="n">1</span> <span class="nb">oscil</span> <span class="mi">6500</span><span class="p">,</span> <span class="nb">p4</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">out</span> a<span class="n">1</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="c1">; Just generate a nice, ordinary sine wave.</span> <span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">32768</span> <span class="mi">10</span> <span class="mi">1</span> <span class="c1">; Play five instances of Instrument #1 for one second.</span> <span class="c1">; Note that 4th p-field contains cycles per second.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span> <span class="mi">220</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span> <span class="mi">440</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span> <span class="mi">880</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span> <span class="mi">1320</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span> <span class="mi">1760</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="idm281472902229000"></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"> <a id="idm281472902225960"></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> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="powoftwo.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="OpcodesTop.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="prepiano.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">powoftwo </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> prepiano</td> </tr> </table> </div> </body> </html>