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<section id="micro-montage-py-create-table-from-random-chunks-of-a-soundfile">
<h1>05-micro-montage.py - Create table from random chunks of a soundfile.<a class="headerlink" href="#micro-montage-py-create-table-from-random-chunks-of-a-soundfile" title="Permalink to this heading">¶</a></h1>
<p>This example creates a new sound table from random chunks of a soundfile.</p>
<p>The SndTable object has some methods to help mixing different sounds or
parts of sounds into a single table:</p>
<ul class="simple">
<li><dl class="simple">
<dt>setSound(path, start=0, stop=None)</dt><dd><p>Replace the table content with the new sound.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>insert(path, pos=0, crossfade=0, start=0, stop=None)</dt><dd><p>Insert samples at a given position in the table, with crossfades.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>append(path, crossfade=0, start=0, stop=None)</dt><dd><p>Append samples at the end of the table, with crossfade.</p>
</dd>
</dl>
</li>
</ul>
<p>To generate a new mix in the sound table, call the <cite>gen()</cite> function
in the Interpreter field of the Server GUI.</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>
<span class="kn">import</span> <span class="nn">random</span>

<span class="n">s</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">Server</span></a><span class="p">()</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>

<span class="c1"># Path and duration of the choosen soundfile.</span>
<span class="n">path</span> <span class="o">=</span> <span class="s2">"../snds/baseballmajeur_m.aif"</span>
<span class="n">snddur</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/functions/sndfile.html#pyo.sndinfo" title="pyo.sndinfo"><span class="n">sndinfo</span></a><span class="p">(</span><span class="n">path</span><span class="p">)[</span><span class="mi">1</span><span class="p">]</span>

<span class="c1"># Initialize an empty sound table.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">table</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">SndTable</span></a><span class="p">()</span>

<span class="c1"># Before generating a new table mix, we activate the fadeout of the</span>
<span class="c1"># envelope to ensure that the table is modified in the silence. As</span>
<span class="c1"># soon as the table is generated, we call the envelope fadein.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Fader" title="pyo.lib.controls.Fader"><span class="n">fade</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Fader" title="pyo.lib.controls.Fader"><span class="n">Fader</span></a><span class="p">(</span><span class="n">fadein</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span> <span class="n">fadeout</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span> <span class="n">dur</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="mf">0.7</span><span class="p">)</span>

<span class="c1"># Reads the table with forward looping.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">loop</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">Looper</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">table</span></a><span class="p">,</span> <span class="n">dur</span><span class="o">=</span><span class="n">table</span><span class="o">.</span><span class="n">getDur</span><span class="p">(),</span> <span class="n">xfade</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Fader" title="pyo.lib.controls.Fader"><span class="n">fade</span></a><span class="p">)</span>

<span class="c1"># Adds some reverb and send the signal to the output.</span>
<span class="n">rvrb</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.STRev" title="pyo.lib.effects.STRev"><span class="n">STRev</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">loop</span></a><span class="p">,</span> <span class="n">inpos</span><span class="o">=</span><span class="mf">0.50</span><span class="p">,</span> <span class="n">revtime</span><span class="o">=</span><span class="mf">1.5</span><span class="p">,</span> <span class="n">bal</span><span class="o">=</span><span class="mf">0.15</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>


<span class="k">def</span> <span class="nf">addsnd</span><span class="p">():</span>
    <span class="c1"># Randomly choose a new starting point and a new duration.</span>
    <span class="n">start</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">snddur</span> <span class="o">*</span> <span class="mf">0.7</span><span class="p">)</span>
    <span class="n">duration</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">)</span>

    <span class="c1"># Randomly choose an insert point in the sound table and a croosfade time.</span>
    <span class="n">pos</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.05</span><span class="p">,</span> <span class="n">table</span><span class="o">.</span><span class="n">getDur</span><span class="p">()</span> <span class="o">-</span> <span class="mf">0.5</span><span class="p">)</span>
    <span class="n">cross</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.04</span><span class="p">,</span> <span class="n">duration</span> <span class="o">/</span> <span class="mi">2</span><span class="p">)</span>

    <span class="c1"># Insert the new chunk in the current sound table.</span>
    <span class="n">table</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">pos</span><span class="o">=</span><span class="n">pos</span><span class="p">,</span> <span class="n">crossfade</span><span class="o">=</span><span class="n">cross</span><span class="p">,</span> <span class="n">start</span><span class="o">=</span><span class="n">start</span><span class="p">,</span> <span class="n">stop</span><span class="o">=</span><span class="n">start</span> <span class="o">+</span> <span class="n">duration</span><span class="p">)</span>


<span class="k">def</span> <span class="nf">delgen</span><span class="p">():</span>
    <span class="c1"># Randomly choose a new starting point and a new duration.</span>
    <span class="n">start</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">snddur</span> <span class="o">*</span> <span class="mf">0.7</span><span class="p">)</span>
    <span class="n">duration</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">)</span>

    <span class="c1"># Load the chosen segment in the sound table.</span>
    <span class="n">table</span><span class="o">.</span><span class="n">setSound</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">start</span><span class="o">=</span><span class="n">start</span><span class="p">,</span> <span class="n">stop</span><span class="o">=</span><span class="n">start</span> <span class="o">+</span> <span class="n">duration</span><span class="p">)</span>

    <span class="c1"># Add 10 more chunks.</span>
    <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">):</span>
        <span class="n">addsnd</span><span class="p">()</span>

    <span class="c1"># Set the new table duration to the Looper and reset it.</span>
    <span class="n">loop</span><span class="o">.</span><span class="n">dur</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">getDur</span><span class="p">()</span>
    <span class="n">loop</span><span class="o">.</span><span class="n">reset</span><span class="p">()</span>

    <span class="c1"># Activate the envelope fadein.</span>
    <span class="n">fade</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>


<span class="c1"># CallAfter calls a function after a given delay time.</span>
<span class="n">caller</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.CallAfter" title="pyo.lib.pattern.CallAfter"><span class="n">CallAfter</span></a><span class="p">(</span><span class="n">function</span><span class="o">=</span><span class="n">delgen</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="mf">0.005</span><span class="p">)</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span>


<span class="k">def</span> <span class="nf">gen</span><span class="p">():</span>
    <span class="s2">"Create a new mix in the sound table."</span>
    <span class="n">fade</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span>  <span class="c1"># Launch the fadeout...</span>
    <span class="n">caller</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>  <span class="c1"># ... then call the delayed generation.</span>


<span class="c1"># Generate the intial table.</span>
<span class="n">gen</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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