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<section id="looper-py-high-quality-crossfading-multimode-sound-looper">
<h1>03-looper.py - High quality crossfading multimode sound looper.<a class="headerlink" href="#looper-py-high-quality-crossfading-multimode-sound-looper" title="Permalink to this heading">¶</a></h1>
<p>The Looper object reads audio from a PyoTableObject and plays it back in
a loop with user-defined pitch, start time, duration and crossfade time.</p>
<p>Looper will send a trigger signal every time a new playback starts, which
means at the object activation and at the beginning of the crossfade when
looping. User can retrieve the trigger streams with obj[‘trig’].</p>
<p>Looper also outputs a time stream, given the current position of the
reading pointer, normalized between 0.0 and 1.0 (1.0 means the beginning
of the crossfade), inside the loop. User can retrieve the trigger stream
with obj[‘time’].</p>
<p>Some methods let change the behaviour of the loop:</p>
<ul class="simple">
<li><dl class="simple">
<dt>Looper.appendFadeTime(boolean):</dt><dd><p>If True, the crossfade starts after the loop duration.</p>
</dd>
</dl>
</li>
<li><dl class="simple">
<dt>Looper.fadeInSeconds(boolean):</dt><dd><p>If True, the crossfade duration (<cite>xfade</cite> attribute) is set in seconds.</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="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>
<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="s2">"../snds/baseballmajeur_m.aif"</span><span class="p">)</span>
<span class="n">table</span><span class="o">.</span><span class="n">view</span><span class="p">()</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="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>
<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="c1"># The table to read.</span>
<span class="n">pitch</span><span class="o">=</span><span class="mf">1.0</span><span class="p">,</span> <span class="c1"># Speed factor, 0.5 means an octave lower,</span>
<span class="c1"># 2 means an octave higher.</span>
<span class="n">start</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="c1"># Start time of the loop, in seconds.</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="c1"># Duration of the loop, in seconds.</span>
<span class="n">xfade</span><span class="o">=</span><span class="mi">25</span><span class="p">,</span> <span class="c1"># Duration of the crossfade, in % of the loop length.</span>
<span class="n">mode</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="c1"># Looping mode: 0 = no loop, 1 = forward,</span>
<span class="c1"># 2 = backward, 3 = back-and-forth.</span>
<span class="n">xfadeshape</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="c1"># Shape of the crossfade envelope: 0 = linear</span>
<span class="c1"># 1 = equal power, 2 = sigmoid.</span>
<span class="n">startfromloop</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="c1"># If True, the playback starts from the loop start</span>
<span class="c1"># point. If False, the playback starts from the</span>
<span class="c1"># beginning and enters the loop mode when crossing</span>
<span class="c1"># the loop start point.</span>
<span class="n">interp</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="c1"># Interpolation method (used when speed != 1):</span>
<span class="c1"># 1 = none, 2 = linear, 3 = cosine, 4 = cubic.</span>
<span class="n">autosmooth</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="c1"># If True, a lowpass filter, following the pitch,</span>
<span class="c1"># is applied on the output signal to reduce the</span>
<span class="c1"># quantization noise produced by very low transpositions.</span>
<span class="c1"># interp = 4 and autosmooth = True give a very high</span>
<span class="c1"># quality reader for playing sound at low rates.</span>
<span class="n">mul</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">looper</span><span class="o">.</span><span class="n">ctrl</span><span class="p">()</span>
<span class="n">stlooper</span> <span class="o">=</span> <span class="n">looper</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="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>
</pre></div>
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