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<section id="table-stutter-py-variable-length-table-reading">
<h1>06-table-stutter.py - Variable length table reading.<a class="headerlink" href="#table-stutter-py-variable-length-table-reading" title="Permalink to this heading">¶</a></h1>
<p>This little program use a function and a time-variable function caller
to stutter a sound loaded in a table. The starting point of the table
playback is set initially to near the end of the table, and move toward
the beginning each time a new playback is called.</p>
<p>For the playback, we use a Pointer object, which is a table reader with
control on the pointer position (normalized between 0 and 1).</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="n">STUTTER</span> <span class="o">=</span> <span class="mf">0.025</span>  <span class="c1"># Delta time added each time the playback restart.</span>
<span class="n">FADETIME</span> <span class="o">=</span> <span class="mf">0.01</span>  <span class="c1"># Fadein-fadeout time to avoid clicks.</span>

<span class="c1"># Load a sound in the table and get its duration.</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="n">SNDS_PATH</span> <span class="o">+</span> <span class="s2">"/transparent.aif"</span><span class="p">)</span>
<span class="n">tabdur</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="c1"># Intialize the line used to read the table.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Linseg" title="pyo.lib.controls.Linseg"><span class="n">line</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Linseg" title="pyo.lib.controls.Linseg"><span class="n">Linseg</span></a><span class="p">([(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span> <span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)])</span>

<span class="c1"># Amplitude envelope, to avoid clicks.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Fader" title="pyo.lib.controls.Fader"><span class="n">amp</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">FADETIME</span><span class="p">,</span> <span class="n">FADETIME</span><span class="p">,</span> <span class="n">dur</span><span class="o">=</span><span class="n">STUTTER</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="n">amp</span><span class="o">.</span><span class="n">setExp</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>

<span class="c1"># Read the sound and mix it to stereo.</span>
<span class="n">read</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Pointer" title="pyo.lib.tableprocess.Pointer"><span class="n">Pointer</span></a><span class="p">(</span><span class="n">table</span><span class="o">=</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">index</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Linseg" title="pyo.lib.controls.Linseg"><span class="n">line</span></a><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">amp</span></a><span class="p">)</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>

<span class="c1"># Global variables (start position and playback duration).</span>
<span class="n">start</span> <span class="o">=</span> <span class="n">tabdur</span> <span class="o">-</span> <span class="n">STUTTER</span>
<span class="n">dur</span> <span class="o">=</span> <span class="n">STUTTER</span>


<span class="k">def</span> <span class="nf">go</span><span class="p">():</span>
    <span class="s2">"Read a segment of a sound table and set the duration before the next iteration."</span>
    <span class="k">global</span> <span class="n">start</span><span class="p">,</span> <span class="n">dur</span>

    <span class="c1"># Create the pointer segment (from normalized start position to the end of the table)</span>
    <span class="n">line</span><span class="o">.</span><span class="n">list</span> <span class="o">=</span> <span class="p">[(</span><span class="mi">0</span><span class="p">,</span> <span class="n">start</span> <span class="o">/</span> <span class="n">tabdur</span><span class="p">),</span> <span class="p">(</span><span class="n">dur</span><span class="p">,</span> <span class="mi">1</span><span class="p">)]</span>

    <span class="c1"># Assign duration to the envelope and the function caller (Pattern).</span>
    <span class="n">amp</span><span class="o">.</span><span class="n">dur</span> <span class="o">=</span> <span class="n">pat</span><span class="o">.</span><span class="n">time</span> <span class="o">=</span> <span class="n">dur</span>

    <span class="c1"># Decrement start position and increment duration by STUTTER seconds.</span>
    <span class="n">start</span> <span class="o">-=</span> <span class="n">STUTTER</span>
    <span class="n">dur</span> <span class="o">+=</span> <span class="n">STUTTER</span>

    <span class="c1"># Reset start and dur variables when reaching the beginning of the sound.</span>
    <span class="k">if</span> <span class="n">start</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">:</span>
        <span class="n">start</span> <span class="o">=</span> <span class="n">tabdur</span> <span class="o">-</span> <span class="n">STUTTER</span>
        <span class="n">dur</span> <span class="o">=</span> <span class="n">STUTTER</span>

    <span class="c1"># Activate the pointer's index line and the amplitude envelope.</span>
    <span class="n">line</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
    <span class="n">amp</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>


<span class="c1"># Call go() each time the playback reaches the end of the file</span>
<span class="n">pat</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.Pattern" title="pyo.lib.pattern.Pattern"><span class="n">Pattern</span></a><span class="p">(</span><span class="n">function</span><span class="o">=</span><span class="n">go</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="n">STUTTER</span><span class="p">)</span><span class="o">.</span><span class="n">play</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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