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<section id="midi-scan-py-scan-for-midi-channels-and-controller-numbers">
<h1>01-midi-scan.py - Scan for MIDI channels and controller numbers.<a class="headerlink" href="#midi-scan-py-scan-for-midi-channels-and-controller-numbers" title="Permalink to this heading">¶</a></h1>
<p>CtlScan and CtlScan2 objects are useful to find controller numbers used
by your MIDI devices.</p>
<p>List of MIDI-related functions:</p>
<ul class="simple">
<li><dl class="simple">
<dt>pm_count_devices:</dt><dd><p>Returns the number of devices found by Portmidi.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>pm_get_default_input:</dt><dd><p>Returns the index number of Portmidi’s default input device.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>pm_get_default_output:</dt><dd><p>Returns the index number of Portmidi’s default output device.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>pm_get_input_devices:</dt><dd><p>Returns midi input devices (device names, device indexes) found by Portmidi.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>pm_get_output_devices:</dt><dd><p>Returns midi output devices (device names, device indexes) found by Portmidi.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>pm_list_devices:</dt><dd><p>Prints a list of all devices found by Portmidi.</p>
</dd>
</dl>
</li>
</ul>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <a class="sphinx-codeautolink-a" href="../../api/alphabetical.html#module-pyo" title="pyo"><span class="nn">pyo</span></a> <span class="kn">import</span> <span class="o">*</span>

<span class="c1"># Print the list of available MIDI devices to the console.</span>
<a class="sphinx-codeautolink-a" href="../../api/functions/midi.html#pyo.pm_list_devices" title="pyo.pm_list_devices"><span class="n">pm_list_devices</span></a><span class="p">()</span>

<a class="sphinx-codeautolink-a" href="../../api/classes/server.html#pyo.Server" title="pyo.lib.server.Server"><span class="n">s</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/server.html#pyo.Server" title="pyo.lib.server.Server"><span class="n">Server</span></a><span class="p">(</span><span class="n">duplex</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>

<span class="c1"># Give the ID of the desired device (as listed by pm_list_devices()) to the</span>
<span class="c1"># setMidiInputDevice() of the Server. A bigger number than the higher device</span>
<span class="c1"># ID will open all connected MIDI devices.</span>
<span class="n">s</span><span class="o">.</span><span class="n">setMidiInputDevice</span><span class="p">(</span><span class="mi">99</span><span class="p">)</span>

<span class="c1"># The MIDI device must be set before booting the server.</span>
<span class="n">s</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>

<span class="nb">print</span><span class="p">(</span><span class="s2">"Play with your Midi controllers..."</span><span class="p">)</span>

<span class="c1"># Function called by CtlScan2 object.</span>
<span class="k">def</span> <span class="nf">scanner</span><span class="p">(</span><span class="n">ctlnum</span><span class="p">,</span> <span class="n">midichnl</span><span class="p">):</span>
    <span class="nb">print</span><span class="p">(</span><span class="s2">"MIDI channel: </span><span class="si">%d</span><span class="s2">, controller number: </span><span class="si">%d</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">midichnl</span><span class="p">,</span> <span class="n">ctlnum</span><span class="p">))</span>


<span class="c1"># Listen to controller input.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.CtlScan2" title="pyo.lib.midi.CtlScan2"><span class="n">scan</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.CtlScan2" title="pyo.lib.midi.CtlScan2"><span class="n">CtlScan2</span></a><span class="p">(</span><span class="n">scanner</span><span class="p">,</span> <span class="n">toprint</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>

<span class="n">s</span><span class="o">.</span><span class="n">gui</span><span class="p">(</span><span class="nb">locals</span><span class="p">())</span>
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