<?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>ftchnls</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="freeverb.html" title="freeverb" /> <link rel="next" href="ftconv.html" title="ftconv" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">ftchnls</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="freeverb.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="ftconv.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="ftchnls"> <a id="ftchnls"></a> <div class="titlepage"></div> <a id="IndexFtchnls" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">ftchnls</span> </h2> <p>ftchnls — Returns the number of channels in a stored function table. </p> </div> <div class="refsect1" title="Description"> <a id="idp24509752"></a> <h2>Description</h2> <p> Returns the number of channels in a stored function table. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp24510424"></a> <h2>Syntax</h2> <pre class="synopsis"><span class="command"><strong>ftchnls</strong></span>(x) (init-rate args only)</pre> </div> <div class="refsect1" title="Performance"> <a id="idp24520800"></a> <h2>Performance</h2> <p> Returns the number of channels of a <a class="link" href="GEN01.html" title="GEN01"><em class="citetitle">GEN01</em></a> table, determined from the header of the original file. If the original file has no header or the table was not created by these GEN01, <span class="emphasis"><em>ftchnls</em></span> returns -1. </p> </div> <div class="refsect1" title="Examples"> <a id="idp24522208"></a> <h2>Examples</h2> <p> Here is an example of the ftchnls opcode. It uses the files <a class="ulink" href="examples/ftchnls.csd" target="_top"><em class="citetitle">ftchnls.csd</em></a>, <a class="ulink" href="examples/mary.wav" target="_top"><em class="citetitle">mary.wav</em></a>, and <a class="ulink" href="examples/kickroll.wav" target="_top"><em class="citetitle">kickroll.wav</em></a>. </p> <div class="example"> <a id="idp24524048"></a> <p class="title"> <strong>Example 301. Example of the ftchnls 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">;-odac ;;;realtime audio out</span> -iadc <span class="comment">;;;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 ftchnls.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="ohdr">0dbfs</span> <span class="op">=</span> 1 <span class="oblock">instr</span> 1 ichnls <span class="op">=</span> <span class="opc">ftchnls</span>(p4) <span class="opc">print</span> ichnls <span class="octrl">if</span> (ichnls <span class="op">==</span> 1) then asigL <span class="opc">loscil3</span> .8, 4, p4 asigR <span class="op">=</span> asigL <span class="octrl">elseif</span> (ichnls <span class="op">==</span> 2) then asigL, asigR <span class="opc">loscil3</span> .8, 4, p4 <span class="comment">;safety precaution if not mono or stereo</span> <span class="octrl">else</span> asigL <span class="op">=</span> 0 asigR <span class="op">=</span> 0 <span class="octrl">endif</span> <span class="opc">outs</span> asigL, asigR <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">f</span> 1 0 0 1 "mary.wav" 0 0 0 <span class="stamnt">f</span> 2 0 0 1 "kickroll.wav" 0 0 0 <span class="stamnt">i</span> 1 0 3 1 <span class="comment">;mono file</span> <span class="stamnt">i</span> 1 + 2 2 <span class="comment">;stereo file</span> <span class="stamnt">e</span> <span class="csdtag"></CsScore></span> <span class="csdtag"></CsoundSynthesizer></span> </pre> </div> </div> <p><br class="example-break" /> The audio file <span class="quote">“<span class="quote">mary.wav</span>”</span> is monophonic, the audio file <span class="quote">“<span class="quote">kickroll.wav</span>”</span> is stereophonic, so its output should include lines like these: </p> <pre class="screen"> instr 1: ichnls = 1.000 instr 1: ichnls = 2.000 </pre> <p> </p> </div> <div class="refsect1" title="See Also"> <a id="idp24558032"></a> <h2>See Also</h2> <p> <a class="link" href="ftlen.html" title="ftlen"><em class="citetitle">ftlen</em></a>, <a class="link" href="ftlptim.html" title="ftlptim"><em class="citetitle">ftlptim</em></a>, <a class="link" href="ftsr.html" title="ftsr"><em class="citetitle">ftsr</em></a>, <a class="link" href="nsamp.html" title="nsamp"><em class="citetitle">nsamp</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="idp24560528"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Chris McCormick</td> </tr> <tr> <td>Perth, Australia</td> </tr> <tr> <td>December 2001</td> </tr> </table> <p> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="freeverb.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="ftconv.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">freeverb </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> ftconv</td> </tr> </table> </div> </body> </html>