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<div class="refentry" title="midichn">
<a id="midichn"></a>
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<a id="IndexMidichn" class="indexterm"></a>
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<h2>
<span class="refentrytitle">midichn</span>
</h2>
<p>midichn —
Returns the MIDI channel number from which the note was activated.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp30873512"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>midichn</em></span> returns the MIDI channel number (1 - 16) from which the note was activated. In the case of score notes, it returns 0.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp30927624"></a>
<h2>Syntax</h2>
<pre class="synopsis">ichn <span class="command"><strong>midichn</strong></span></pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp30928568"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ichn</em></span> -- channel number. If the current note was activated from score, it is set to zero.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp30929576"></a>
<h2>Examples</h2>
<p>
Here is a simple example of the midichn opcode. It uses the file <a class="ulink" href="examples/midichn.csd" target="_top"><em class="citetitle">midichn.csd</em></a>.
</p>
<div class="example">
<a id="idp30930568"></a>
<p class="title">
<strong>Example 455. Example of the midichn 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 -M0 -+rtmidi=virtual <span class="comment">;;; midi file input</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
<span class="comment">;change channel on virtual midi keyboard</span>
i1 <span class="opc">midichn</span>
<span class="opc">print</span> i1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 0 20 <span class="comment">;runs for 20 seconds</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
Here is an advanced example of the midichn opcode. It uses the file <a class="ulink" href="examples/midichn_advanced.csd" target="_top"><em class="citetitle">midichn_advanced.csd</em></a>.
</p>
<p>
Don't forget that you must include the <a class="link" href="CommandFlags.html#FlagsMinusUpperF"><em class="citetitle">-F flag</em></a> when using an external MIDI file like <span class="quote">“<span class="quote">midichn_advanced.mid</span>”</span>.
</p>
<p>
</p>
<div class="example">
<a id="idp30934808"></a>
<p class="title">
<strong>Example 456. An advanced example of the midichn opcode.</strong>
</p>
<div class="example-contents">
<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 -F midichn_advanced.mid <span class="comment">;;;realtime audio out with MIDI file input</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o midichn_advanced.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="ohdr">massign</span> 1, 1 <span class="comment">; all channels use instr 1</span>
<span class="ohdr">massign</span> 2, 1
<span class="ohdr">massign</span> 3, 1
<span class="ohdr">massign</span> 4, 1
<span class="ohdr">massign</span> 5, 1
<span class="ohdr">massign</span> 6, 1
<span class="ohdr">massign</span> 7, 1
<span class="ohdr">massign</span> 8, 1
<span class="ohdr">massign</span> 9, 1
<span class="ohdr">massign</span> 10, 1
<span class="ohdr">massign</span> 11, 1
<span class="ohdr">massign</span> 12, 1
<span class="ohdr">massign</span> 13, 1
<span class="ohdr">massign</span> 14, 1
<span class="ohdr">massign</span> 15, 1
<span class="ohdr">massign</span> 16, 1
gicnt <span class="op">=</span> 0 <span class="comment">; note counter</span>
<span class="oblock">instr</span> 1
gicnt <span class="op">=</span> gicnt <span class="op">+</span> 1 <span class="comment">; update note counter</span>
kcnt <span class="opc">init</span> gicnt <span class="comment">; copy to local variable</span>
ichn <span class="opc">midichn</span> <span class="comment">; get channel number</span>
istime <span class="opc">times</span> <span class="comment">; note-on time</span>
<span class="octrl">if</span> (ichn <span class="op">></span> 0.5) <span class="octrl">goto</span> <span class="olabel">l2</span> <span class="comment">; MIDI note</span>
<span class="opc">printks</span> "note <span class="op">%</span>.0f (time <span class="op">=</span> <span class="op">%</span>.2f) was activated from the score\\n", \
3600, kcnt, istime
<span class="octrl">goto</span> <span class="olabel">l1</span>
<span class="olabel">l2</span><span class="op">:</span>
<span class="opc">printks</span> "note <span class="op">%</span>.0f (time <span class="op">=</span> <span class="op">%</span>.2f) was activated from channel <span class="op">%</span>.0f\\n", \
3600, kcnt, istime, ichn
<span class="olabel">l1</span><span class="op">:</span>
icps <span class="opc">cpsmidi</span> <span class="comment">; convert midi note to pitch</span>
kenv <span class="opc">madsr</span> 0.1, 0, 0.8, 0.9
asig <span class="opc">pluck</span> kenv, icps, icps, 1, 1
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">t</span> 0 60 <span class="comment">;beats per minute</span>
<span class="stamnt">f</span> 0 8 <span class="comment">;stay active for 8 seconds</span>
<span class="stamnt">f</span> 1 0 4096 10 1 <span class="comment">;sine</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like:
</p>
<pre class="screen">
note 1 (time = 0.00) was activated from channel 1
note 2 (time = 2.00) was activated from channel 4
note 3 (time = 3.00) was activated from channel 2
note 4 (time = 5.00) was activated from channel 3
</pre>
<p>
</p>
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<div class="refsect1" title="See Also">
<a id="idp30936592"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pgmassign.html" title="pgmassign"><em class="citetitle">pgmassign</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp30937664"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Istvan Varga</td>
</tr>
<tr>
<td>May 2002</td>
</tr>
</table>
<p>
</p>
<p>New in version 4.20</p>
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