<?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>nchnls_i</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /> <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="nchnls.html" title="nchnls" /> <link rel="next" href="nestedap.html" title="nestedap" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">nchnls_i</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="nchnls.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="nestedap.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="nchnls_i"> <a id="nchnls_i"></a> <div class="titlepage"></div> <a id="IndexNchns_I" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">nchnls_i</span> </h2> <p>nchnls_i — Sets the number of channels of audio input. </p> </div> <div class="refsect1" title="Description"> <a id="idp32699248"></a> <h2>Description</h2> <p> These statements are global value <a class="link" href="assign.html" title="="><em class="citetitle">assignments</em></a>, made at the beginning of an orchestra, before any instrument block is defined. Their function is to set certain <a class="link" href="OrchKvar.html#VariableTypes" title="Table 3. Types of Variables"><em class="citetitle">reserved symbol variables</em></a> that are required for performance. Once set, these reserved symbols can be used in expressions anywhere in the orchestra. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp32744472"></a> <h2>Syntax</h2> <pre class="synopsis"><span class="command"><strong>nchnls_i</strong></span> = iarg</pre> </div> <div class="refsect1" title="Initialization"> <a id="idp32745480"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>nchnls_i</em></span> = (optional) -- set number of channels of audio input to <span class="emphasis"><em>iarg</em></span>. (1 = mono, 2 = stereo, 4 = quadraphonic.) The default value is the valus of <span class="emphasis"><em>nchnls</em></span>. </p> <p> In addition, any <a class="link" href="OrchKvar.html#GlobalVariables"><em class="citetitle">global variable</em></a> can be initialized by an <span class="emphasis"><em>init-time assignment</em></span> anywhere before the first <a class="link" href="instr.html" title="instr"><em class="citetitle">instr statement</em></a>. All of the above assignments are run as instrument 0 (i-pass only) at the start of real performance. </p> </div> <div class="refsect1" title="Examples"> <a id="idp32748480"></a> <h2>Examples</h2> <p> Here is an example of the nchnls_i opcode. It uses the file <a class="ulink" href="examples/nchnls_i.csd" target="_top"><em class="citetitle">nchnls_i.csd</em></a>. </p> <div class="example"> <a id="idp32749448"></a> <p class="title"> <strong>Example 504. Example of the nchnls_i 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 -idac <span class="comment">;;;realtime audio I/O</span> <span class="comment">; For Non-realtime ouput leave only the line below:</span> <span class="comment">; nchnls_i.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">nchnls</span> <span class="op">=</span> 2 <span class="comment">;2 channels out</span> <span class="ohdr">0dbfs</span> <span class="op">=</span> 1 nchnls_i <span class="op">=</span> 4 <span class="comment">;4 channels in</span> <span class="oblock">instr</span> 1 <span class="comment">;4 channels in, two channels out</span> ain1, ain2, ain3, ain4 <span class="opc">inq</span> <span class="comment">;grab your mics and sing</span> adel <span class="opc">linseg</span> 0, p3<span class="op">*</span>.5, 0.02, p3<span class="op">*</span>.5, 0 <span class="comment">;max delay time = 20ms</span> adel2 <span class="opc">linseg</span> 0.02, p3<span class="op">*</span>.5, 0, p3<span class="op">*</span>.5, 0.02 <span class="comment">;max delay time = 20ms </span> aoutl <span class="opc">flanger</span> ain1, adel, .7 aoutr <span class="opc">flanger</span> ain2, adel<span class="op">*</span>2, .8 aoutla <span class="opc">flanger</span> ain3, adel2, .9 aoutra <span class="opc">flanger</span> ain4, adel2<span class="op">*</span>2, .5 <span class="comment">;write to quad file, 16 bits with header</span> <span class="opc">fout</span> "in_4.wav", 14, aoutl, aoutr, aoutla, aoutra <span class="opc">outs</span> (aoutl<span class="op">+</span>aoutla)<span class="op">*</span>.5, (aoutr<span class="op">+</span>aoutra)<span class="op">*</span>.5 <span class="comment">;stereo out</span> <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">i</span> 1 0 10 <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="idp32751728"></a> <h2>See Also</h2> <p> <a class="link" href="kr.html" title="kr"><em class="citetitle">kr</em></a>, <a class="link" href="ksmps.html" title="ksmps"><em class="citetitle">ksmps</em></a>, <a class="link" href="nchnls.html" title="nchnls"><em class="citetitle">nchnls</em></a>, <a class="link" href="sr.html" title="sr"><em class="citetitle">sr</em></a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="nchnls.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="nestedap.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">nchnls </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> nestedap</td> </tr> </table> </div> </body> </html>