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<h2>
<span class="refentrytitle">filenchnls</span>
</h2>
<p>filenchnls —
Returns the number of channels in a sound file.
</p>
</div>
<div class="refsect1">
<a id="idm281472937887928"></a>
<h2>Description</h2>
<p>
Returns the number of channels in a sound file.
</p>
</div>
<div class="refsect1">
<a id="idm281472937886584"></a>
<h2>Syntax</h2>
<pre class="synopsis">ir <span class="command"><strong>filenchnls</strong></span> ifilcod [, iallowraw]</pre>
</div>
<div class="refsect1">
<a id="idm281472937816392"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifilcod</em></span> -- sound file to be queried
</p>
<p>
<span class="emphasis"><em>iallowraw</em></span> -- (Optional) Allow raw sound files (default=1)
</p>
</div>
<div class="refsect1">
<a id="idm281472937813784"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>filenchnls</em></span> returns the number of channels in the sound file <span class="emphasis"><em>ifilcod</em></span>. <span class="emphasis"><em>filechnls</em></span> can return the number of channels of convolve and PVOC files if the <span class="emphasis"><em>iallowraw</em></span> flag is not zero (it is non-zero by default).
</p>
</div>
<div class="refsect1">
<a id="idm281472937810728"></a>
<h2>Examples</h2>
<p>
Here is an example of the filenchnls opcode. It uses the file <a class="ulink" href="examples/filenchnls.csd" target="_top"><em class="citetitle">filenchnls.csd</em>, </a><a class="ulink" href="examples/fox.wav" target="_top"><em class="citetitle">fox.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="idm281472937807208"></a>
<p class="title">
<strong>Example 270. Example of the filenchnls 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="idm281472770197416"></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 filechnls.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> <span class="c1">; choose between mono or stereo file</span>
i<span class="n">len</span> <span class="nb">filelen</span> <span class="nb">p4</span> <span class="c1">;calculate length of soundfile</span>
<span class="c1">;print ilen</span>
i<span class="n">chn</span> <span class="nb">filenchnls</span> <span class="nb">p4</span> <span class="c1">;check number of channels</span>
<span class="nb">print</span> i<span class="n">chn</span>
<span class="k">if</span> <span class="p">(</span>i<span class="n">chn</span> <span class="o">==</span> <span class="mi">1</span><span class="p">)</span> <span class="k">then</span>
<span class="c1">;mono signal</span>
a<span class="n">sig</span> <span class="nb">diskin2</span> <span class="nb">p4</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="k">else</span>
<span class="c1">;stereo signal</span>
a<span class="n">L</span><span class="p">,</span> a<span class="n">R</span> <span class="nb">diskin2</span> <span class="nb">p4</span><span class="p">,</span> <span class="mf">.5</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">outs</span> a<span class="n">L</span><span class="p">,</span> a<span class="n">R</span>
<span class="k">endif</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</span> <span class="s">"fox.wav"</span> <span class="c1">;mono signal</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">5</span> <span class="mi">2</span> <span class="s">"kickroll.wav"</span> <span class="c1">;stereo signal</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">fox.wav</span>”</span> is monoaural (1 channel), while <span class="quote">“<span class="quote">kickroll.wav</span>”</span> is stereo (2 channels) So <span class="emphasis"><em>filenchnls</em></span>'s output should include lines like this:
</p>
<pre class="screen">
instr 1: ichn = 1.000
instr 1: ichn = 2.000
</pre>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472937800760"></a>
<h2>See Also</h2>
<p>
<a class="link" href="filebit.html" title="filebit"><em class="citetitle">filebit</em></a>,
<a class="link" href="filelen.html" title="filelen"><em class="citetitle">filelen</em></a>,
<a class="link" href="filepeak.html" title="filepeak"><em class="citetitle">filepeak</em></a>,
<a class="link" href="filesr.html" title="filesr"><em class="citetitle">filesr</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472937795736"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Matt Ingalls</td>
</tr>
<tr>
<td>July 1999</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.57</p>
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