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<h2>
<span class="refentrytitle">ftchnls</span>
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<p>ftchnls —
Returns the number of channels in a stored function table.
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<div class="refsect1" title="Description">
<a id="id2920834"></a>
<h2>Description</h2>
<p>
Returns the number of channels in a stored function table.
</p>
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<div class="refsect1" title="Syntax">
<a id="id2920847"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>ftchnls</strong></span>(x) (init-rate args only)</pre>
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<div class="refsect1" title="Performance">
<a id="id2921023"></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>
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<div class="refsect1" title="Examples">
<a id="id2921047"></a>
<h2>Examples</h2>
<p>
Here is an example of the ftchnls opcode. It uses the file <a class="ulink" href="examples/ftchnls.csd" target="_top"><em class="citetitle">ftchnls.csd</em></a>, and <a class="ulink" href="examples/mary.wav" target="_top"><em class="citetitle">mary.wav</em></a>.
</p>
<div class="example">
<a id="id2921071"></a>
<p class="title">
<b>Example 272. Example of the ftchnls opcode.</b>
</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</span>
-odac -iadc <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 ftchnls.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">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Print out the number of channels in Table #1.</span>
ichnls <span class="op">=</span> <span class="opc">ftchnls</span>(1)
<span class="opc">print</span> ichnls
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1: Use an audio file, Csound will determine its size.</span>
<span class="stamnt">f</span> 1 0 0 1 "mary.wav" 0 0 0
<span class="comment">; Play Instrument #1 for 1 second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
Since the audio file <span class="quote">“<span class="quote">mary.wav</span>”</span> is monophonic (1 channel), its output should include a line like this:
</p>
<pre class="screen">
instr 1: ichnls = 1.000
</pre>
<p>
</p>
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<div class="refsect1" title="See Also">
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<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>
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<div class="refsect1" title="Credits">
<a id="id2921758"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
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<td>Author: Chris McCormick</td>
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<td>Perth, Australia</td>
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<td>December 2001</td>
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<p>
</p>
<p>Example written by Kevin Conder.</p>
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