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<section id="notein-object-py-how-to-use-the-notein-object">
<h1>02-notein-object.py - How to use the Notein object.<a class="headerlink" href="#notein-object-py-how-to-use-the-notein-object" title="Permalink to this heading">¶</a></h1>
<p>This example shows how to use the Notein object to control audio
processes with events received from a MIDI keyboard (virtual or not).</p>
<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>
<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">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"># Open all input devices.</span>
<span class="n">s</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>
<span class="c1"># Default arguments of the Notein object.</span>
<span class="c1"># - 10 voices of polyphony, which means that this object will manage</span>
<span class="c1"># 10 pitch/velocity streams simultaneously.</span>
<span class="c1"># - scale=0 means that the pitch information will be MIDI numbers.</span>
<span class="c1"># Use 1 for Hertz and 2 for transposition factors.</span>
<span class="c1"># - first and last arguments are the lowest and highest MIDI notes</span>
<span class="c1"># that this object will handle. This is useful to split the complete</span>
<span class="c1"># range over multiple processes.</span>
<span class="c1"># - channel is the MIDI channel this object will listen to. 0 means all</span>
<span class="c1"># channels.</span>
<span class="c1"># - The mul argument affects velocities, which are already normalized</span>
<span class="c1"># between 0 and 1.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">Notein</span></a><span class="p">(</span><span class="n">poly</span><span class="o">=</span><span class="mi">10</span><span class="p">,</span> <span class="n">scale</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">first</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">last</span><span class="o">=</span><span class="mi">127</span><span class="p">,</span> <span class="n">channel</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="c1"># User can show a keyboard widget to supply MIDI events.</span>
<span class="n">notes</span><span class="o">.</span><span class="n">keyboard</span><span class="p">()</span>
<span class="c1"># Notein["pitch"] retrieves pitch streams.</span>
<span class="c1"># Converts MIDI pitch to frequency in Hertz.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/utils.html#pyo.MToF" title="pyo.lib.utils.MToF"><span class="n">freqs</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/utils.html#pyo.MToF" title="pyo.lib.utils.MToF"><span class="n">MToF</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a><span class="p">[</span><span class="s2">"pitch"</span><span class="p">])</span>
<span class="c1"># Notein["velocity"] retrieves normalized velocity streams.</span>
<span class="c1"># Applies a portamento on the velocity changes.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Port" title="pyo.lib.filters.Port"><span class="n">amps</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Port" title="pyo.lib.filters.Port"><span class="n">Port</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a><span class="p">[</span><span class="s2">"velocity"</span><span class="p">],</span> <span class="n">risetime</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span> <span class="n">falltime</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.1</span><span class="p">)</span>
<span class="c1"># Creates two groups of oscillators (10 per channel), slightly detuned.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.RCOsc" title="pyo.lib.generators.RCOsc"><span class="n">sigL</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.RCOsc" title="pyo.lib.generators.RCOsc"><span class="n">RCOsc</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/utils.html#pyo.MToF" title="pyo.lib.utils.MToF"><span class="n">freqs</span></a><span class="p">,</span> <span class="n">sharp</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Port" title="pyo.lib.filters.Port"><span class="n">amps</span></a><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.RCOsc" title="pyo.lib.generators.RCOsc"><span class="n">sigR</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.RCOsc" title="pyo.lib.generators.RCOsc"><span class="n">RCOsc</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/utils.html#pyo.MToF" title="pyo.lib.utils.MToF"><span class="n">freqs</span></a> <span class="o">*</span> <span class="mf">1.003</span><span class="p">,</span> <span class="n">sharp</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Port" title="pyo.lib.filters.Port"><span class="n">amps</span></a><span class="p">)</span>
<span class="c1"># Mixes the 10 voices per channel to a single stream and send the</span>
<span class="c1"># signals to the audio output.</span>
<span class="n">outL</span> <span class="o">=</span> <span class="n">sigL</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="n">outR</span> <span class="o">=</span> <span class="n">sigR</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="c1"># Notein["trigon"] sends a trigger when a voice receive a noteon.</span>
<span class="c1"># Notein["trigoff"] sends a trigger when a voice receive a noteoff.</span>
<span class="c1"># These functions are called when Notein receives a MIDI note event.</span>
<span class="k">def</span> <span class="nf">noteon</span><span class="p">(</span><span class="n">voice</span><span class="p">):</span>
<span class="s2">"Print pitch and velocity for noteon event."</span>
<span class="n">pit</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a><span class="p">[</span><span class="s2">"pitch"</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">all</span><span class="o">=</span><span class="kc">True</span><span class="p">)[</span><span class="n">voice</span><span class="p">])</span>
<span class="n">vel</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a><span class="p">[</span><span class="s2">"velocity"</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">all</span><span class="o">=</span><span class="kc">True</span><span class="p">)[</span><span class="n">voice</span><span class="p">]</span> <span class="o">*</span> <span class="mi">127</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Noteon: voice = </span><span class="si">%d</span><span class="s2">, pitch = </span><span class="si">%d</span><span class="s2">, velocity = </span><span class="si">%d</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">voice</span><span class="p">,</span> <span class="n">pit</span><span class="p">,</span> <span class="n">vel</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">noteoff</span><span class="p">(</span><span class="n">voice</span><span class="p">):</span>
<span class="s2">"Print pitch and velocity for noteoff event."</span>
<span class="n">pit</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a><span class="p">[</span><span class="s2">"pitch"</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">all</span><span class="o">=</span><span class="kc">True</span><span class="p">)[</span><span class="n">voice</span><span class="p">])</span>
<span class="n">vel</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a><span class="p">[</span><span class="s2">"velocity"</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="nb">all</span><span class="o">=</span><span class="kc">True</span><span class="p">)[</span><span class="n">voice</span><span class="p">]</span> <span class="o">*</span> <span class="mi">127</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Noteoff: voice = </span><span class="si">%d</span><span class="s2">, pitch = </span><span class="si">%d</span><span class="s2">, velocity = </span><span class="si">%d</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">voice</span><span class="p">,</span> <span class="n">pit</span><span class="p">,</span> <span class="n">vel</span><span class="p">))</span>
<span class="c1"># TrigFunc calls a function when it receives a trigger. Because notes["trigon"]</span>
<span class="c1"># contains 10 streams, there will be 10 caller, each one with its own argument,</span>
<span class="c1"># taken from the list of integers given at `arg` argument.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.TrigFunc" title="pyo.lib.triggers.TrigFunc"><span class="n">tfon</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.TrigFunc" title="pyo.lib.triggers.TrigFunc"><span class="n">TrigFunc</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a><span class="p">[</span><span class="s2">"trigon"</span><span class="p">],</span> <span class="n">noteon</span><span class="p">,</span> <span class="n">arg</span><span class="o">=</span><span class="nb">list</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">)))</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.TrigFunc" title="pyo.lib.triggers.TrigFunc"><span class="n">tfoff</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.TrigFunc" title="pyo.lib.triggers.TrigFunc"><span class="n">TrigFunc</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/midi.html#pyo.Notein" title="pyo.lib.midi.Notein"><span class="n">notes</span></a><span class="p">[</span><span class="s2">"trigoff"</span><span class="p">],</span> <span class="n">noteoff</span><span class="p">,</span> <span class="n">arg</span><span class="o">=</span><span class="nb">list</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">10</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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