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<section id="scrubbing-py-navigate-through-a-sound-table">
<h1>02-scrubbing.py - Navigate through a sound table.<a class="headerlink" href="#scrubbing-py-navigate-through-a-sound-table" title="Permalink to this heading">¶</a></h1>
<p>The SndTable object allows to transfer the data from a soundfile
into a function table for a fast access to every sample.</p>
<p>This example illustrates how to do scrubbing with the mouse in
a sound window. The mouse position is then used to control the
position and the balance of a simple stereo granulator.</p>
<p>Give the focus to the Scrubbing window then click and move the mouse…</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="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"># The callback given to the SndTable.view() method.</span>
<span class="k">def</span> <span class="nf">mouse</span><span class="p">(</span><span class="n">mpos</span><span class="p">):</span>
    <span class="nb">print</span><span class="p">(</span><span class="s2">"X = </span><span class="si">%.2f</span><span class="s2">, Y = </span><span class="si">%.2f</span><span class="s2">"</span> <span class="o">%</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">mpos</span><span class="p">))</span>
    <span class="c1"># X value controls the granulator pointer position.</span>
    <span class="n">position</span><span class="o">.</span><span class="n">value</span> <span class="o">=</span> <span class="n">mpos</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
    <span class="c1"># Y value controls the balance between left and right channels.</span>
    <span class="n">l</span><span class="p">,</span> <span class="n">r</span> <span class="o">=</span> <span class="mf">1.0</span> <span class="o">-</span> <span class="n">mpos</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">mpos</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
    <span class="n">leftRightAmp</span><span class="o">.</span><span class="n">value</span> <span class="o">=</span> <span class="p">[</span><span class="n">l</span><span class="p">,</span> <span class="n">r</span><span class="p">]</span>


<span class="c1"># Load and normalize the sound in the table.</span>
<span class="n">snd</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">SndTable</span></a><span class="p">(</span><span class="s2">"../snds/ounkmaster.aif"</span><span class="p">)</span><span class="o">.</span><span class="n">normalize</span><span class="p">()</span>
<span class="c1"># Open the waveform view with a mouse position callback.</span>
<span class="n">snd</span><span class="o">.</span><span class="n">view</span><span class="p">(</span><span class="n">title</span><span class="o">=</span><span class="s2">"Scrubbing window"</span><span class="p">,</span> <span class="n">mouse_callback</span><span class="o">=</span><span class="n">mouse</span><span class="p">)</span>

<span class="c1"># Left and right channel gain values.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">leftRightAmp</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">SigTo</span></a><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="n">time</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">init</span><span class="o">=</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="n">mul</span><span class="o">=</span><span class="mf">0.1</span><span class="p">)</span>
<span class="c1"># Position, in samples, in the SndTable.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">position</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">SigTo</span></a><span class="p">(</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">init</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="n">snd</span><span class="o">.</span><span class="n">getSize</span><span class="p">(),</span> <span class="n">add</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">Noise</span></a><span class="p">(</span><span class="mi">5</span><span class="p">))</span>

<span class="c1"># Simple sound granulator.</span>
<span class="n">gran</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Granulator" title="pyo.lib.tableprocess.Granulator"><span class="n">Granulator</span></a><span class="p">(</span>
    <span class="n">table</span><span class="o">=</span><span class="n">snd</span><span class="p">,</span>  <span class="c1"># the sound table.</span>
    <span class="n">env</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.HannTable" title="pyo.lib.tables.HannTable"><span class="n">HannTable</span></a><span class="p">(),</span>  <span class="c1"># the grain envelope.</span>
    <span class="n">pitch</span><span class="o">=</span><span class="p">[</span><span class="mf">0.999</span><span class="p">,</span> <span class="mf">1.0011</span><span class="p">],</span>  <span class="c1"># global pitch (change every grain).</span>
    <span class="n">pos</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">position</span></a><span class="p">,</span>  <span class="c1"># position in the table where to start a new grain.</span>
    <span class="n">dur</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">Noise</span></a><span class="p">(</span><span class="mf">0.002</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">),</span>  <span class="c1"># duration of the grain (can be used to transpose per grain).</span>
    <span class="n">grains</span><span class="o">=</span><span class="mi">64</span><span class="p">,</span>  <span class="c1"># the number of grains.</span>
    <span class="n">basedur</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span>  <span class="c1"># duration for which the grain is not transposed.</span>
    <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">leftRightAmp</span></a><span class="p">,</span>  <span class="c1"># stereo gain.</span>
<span class="p">)</span><span class="o">.</span><span class="n">out</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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