<?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" />
<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="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">
<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">
<a id="idm281472928932184"></a>
<h2>Description</h2>
<p>
Returns the number of channels in a stored function table.
</p>
</div>
<div class="refsect1">
<a id="idm281472928869960"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>ftchnls</strong></span>(x) (init-rate args only)</pre>
</div>
<div class="refsect1">
<a id="idm281472928868024"></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">
<a id="idm281472928865240"></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="idm281472928861720"></a>
<p class="title">
<strong>Example 354. 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>
<div class="refsect1">
<a id="idm281472759799368"></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">;-odac ;;;realtime audio out</span>
-iadc <span class="c1">;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o ftchnls.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">chnls</span> <span class="o">=</span> <span class="nb">ftchnls</span><span class="p">(</span><span class="nb">p4</span><span class="p">)</span>
<span class="nb">print</span> i<span class="n">chnls</span>
<span class="k">if</span> <span class="p">(</span>i<span class="n">chnls</span> <span class="o">==</span> <span class="mi">1</span><span class="p">)</span> <span class="k">then</span>
a<span class="n">sigL</span> <span class="nb">loscil3</span> <span class="mf">.8</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="nb">p4</span>
a<span class="n">sigR</span> <span class="o">=</span> a<span class="n">sigL</span>
<span class="k">elseif</span> <span class="p">(</span>i<span class="n">chnls</span> <span class="o">==</span> <span class="mi">2</span><span class="p">)</span> <span class="k">then</span>
a<span class="n">sigL</span><span class="p">,</span> a<span class="n">sigR</span> <span class="nb">loscil3</span> <span class="mf">.8</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="nb">p4</span>
<span class="c1">;safety precaution if not mono or stereo</span>
<span class="k">else</span>
a<span class="n">sigL</span> <span class="o">=</span> <span class="mi">0</span>
a<span class="n">sigR</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">endif</span>
<span class="nb">outs</span> a<span class="n">sigL</span><span class="p">,</span> a<span class="n">sigR</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">1</span> <span class="s">"mary.wav"</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span>
<span class="nb">f</span> <span class="mi">2</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">1</span> <span class="s">"kickroll.wav"</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</span> <span class="mi">1</span> <span class="c1">;mono file</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span> <span class="mi">2</span> <span class="c1">;stereo file</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" />
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">
<a id="idm281472928855864"></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">
<a id="idm281472928850872"></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>
distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-release
>
by-pkgid
>
5fcfcb7517038d1f44ab4e478e6e61fa
>
files
>
1946
