<?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>midichn</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="midichannelaftertouch.html" title="midichannelaftertouch" /> <link rel="next" href="midicontrolchange.html" title="midicontrolchange" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">midichn</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="midichannelaftertouch.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="midicontrolchange.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="midichn"></a> <div class="titlepage"></div> <a id="IndexMidichn" class="indexterm"></a> <div class="refnamediv"> <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"> <a id="idm281472915061864"></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"> <a id="idm281472915019544"></a> <h2>Syntax</h2> <pre class="synopsis">ichn <span class="command"><strong>midichn</strong></span></pre> </div> <div class="refsect1"> <a id="idm281472915017464"></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"> <a id="idm281472915015640"></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="idm281472915013864"></a> <p class="title"> <strong>Example 538. 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> <div class="refsect1"> <a id="idm281472739490488"></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> -odac -M0 -+rtmidi=virtual <span class="c1">;;; midi file input</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">;change channel on virtual midi keyboard</span> i<span class="n">1</span> <span class="nb">midichn</span> <span class="nb">print</span> i<span class="n">1</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">f</span> <span class="mi">0</span> <span class="mi">20</span> <span class="c1">;runs for 20 seconds</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" /> </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="idm281472915006040"></a> <p class="title"> <strong>Example 539. An advanced example of the midichn opcode.</strong> </p> <div class="example-contents"> <div class="refsect1"> <a id="idm281472739278104"></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> -odac -F midichn_advanced.mid <span class="c1">;;;realtime audio out with MIDI file input</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o midichn_advanced.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="nb">massign</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">; all channels use instr 1</span> <span class="nb">massign</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">9</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">11</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">12</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">13</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">14</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">15</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">massign</span> <span class="mi">16</span><span class="p">,</span> <span class="mi">1</span> gi<span class="n">cnt</span> <span class="o">=</span> <span class="mi">0</span> <span class="c1">; note counter</span> <span class="kd">instr</span> <span class="nf">1</span> gi<span class="n">cnt</span> <span class="o">=</span> gi<span class="n">cnt</span> <span class="o">+</span> <span class="mi">1</span> <span class="c1">; update note counter</span> k<span class="n">cnt</span> <span class="nb">init</span> gi<span class="n">cnt</span> <span class="c1">; copy to local variable</span> i<span class="n">chn</span> <span class="nb">midichn</span> <span class="c1">; get channel number</span> i<span class="n">stime</span> <span class="nb">times</span> <span class="c1">; note-on time</span> <span class="k">if</span> <span class="p">(</span>i<span class="n">chn</span> <span class="o">></span> <span class="mf">0.5</span><span class="p">)</span> <span class="k">goto</span> <span class="nl">l2</span> <span class="c1">; MIDI note</span> <span class="nb">printks</span> <span class="s">"note %.0f (time = %.2f) was activated from the score</span><span class="se">\\</span><span class="s">n"</span><span class="p">,</span> \ <span class="mi">3600</span><span class="p">,</span> k<span class="n">cnt</span><span class="p">,</span> i<span class="n">stime</span> <span class="k">goto</span> <span class="nl">l1</span> <span class="nl">l2</span><span class="p">:</span> <span class="nb">printks</span> <span class="s">"note %.0f (time = %.2f) was activated from channel %.0f</span><span class="se">\\</span><span class="s">n"</span><span class="p">,</span> \ <span class="mi">3600</span><span class="p">,</span> k<span class="n">cnt</span><span class="p">,</span> i<span class="n">stime</span><span class="p">,</span> i<span class="n">chn</span> <span class="nl">l1</span><span class="p">:</span> i<span class="n">cps</span> <span class="nb">cpsmidi</span> <span class="c1">; convert midi note to pitch</span> k<span class="n">env</span> <span class="nb">madsr</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mf">0.8</span><span class="p">,</span> <span class="mf">0.9</span> a<span class="n">sig</span> <span class="nb">pluck</span> k<span class="n">env</span><span class="p">,</span> i<span class="n">cps</span><span class="p">,</span> i<span class="n">cps</span><span class="p">,</span> <span class="mi">1</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="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">t</span> <span class="mi">0</span> <span class="mi">60</span> <span class="c1">;beats per minute</span> <span class="nb">f</span> <span class="mi">0</span> <span class="mi">8</span> <span class="c1">;stay active for 8 seconds</span> <span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">4096</span> <span class="mi">10</span> <span class="mi">1</span> <span class="c1">;sine</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" /> 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> </div> <div class="refsect1"> <a id="idm281472915002952"></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"> <a id="idm281472915000808"></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> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="midichannelaftertouch.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="midicontrolchange.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">midichannelaftertouch </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> midicontrolchange</td> </tr> </table> </div> </body> </html>