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<section id="offline-batch-generation-of-synthesis-sounds">
<h1>Offline batch generation of synthesis sounds<a class="headerlink" href="#offline-batch-generation-of-synthesis-sounds" title="Permalink to this heading">¶</a></h1>
<p><strong>06-batch-synthesis.py</strong></p>
<p>This program demonstrates how to use pyo to do offline synthesis batch
generation.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">os</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="c1"># Initialize the Server in offline mode.</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">duplex</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">audio</span><span class="o">=</span><span class="s2">"offline"</span><span class="p">)</span>

<span class="c1"># Path to the output sound folder (user's home directory/pyo_batch_synth/).</span>
<span class="n">output_folder</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">expanduser</span><span class="p">(</span><span class="s2">"~"</span><span class="p">),</span> <span class="s2">"pyo_batch_synth"</span><span class="p">)</span>

<span class="c1"># Create the folder if it does not exist.</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">output_folder</span><span class="p">):</span>
    <span class="n">os</span><span class="o">.</span><span class="n">mkdir</span><span class="p">(</span><span class="n">output_folder</span><span class="p">)</span>

<span class="c1"># Output file duration.</span>
<span class="n">dur</span> <span class="o">=</span> <span class="mi">2</span>

<span class="c1"># How many file to generate.</span>
<span class="n">NUM</span> <span class="o">=</span> <span class="mi">12</span>

<span class="c1"># Enter the batch synthesis loop.</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="n">NUM</span><span class="p">):</span>
    <span class="c1"># Boot the Server.</span>
    <span class="n">s</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>

    <span class="c1"># Define the pitch of the note.</span>
    <span class="n">note</span> <span class="o">=</span> <span class="mi">60</span> <span class="o">+</span> <span class="n">i</span>
    <span class="n">noteFreq</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/functions/conv.html#pyo.midiToHz" title="pyo.midiToHz"><span class="n">midiToHz</span></a><span class="p">(</span><span class="n">note</span><span class="p">)</span>

    <span class="c1"># Set recording parameters.</span>
    <span class="n">s</span><span class="o">.</span><span class="n">recordOptions</span><span class="p">(</span>
        <span class="n">dur</span><span class="o">=</span><span class="n">dur</span> <span class="o">+</span> <span class="mf">0.1</span><span class="p">,</span> <span class="n">filename</span><span class="o">=</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">output_folder</span><span class="p">,</span> <span class="s2">"file_</span><span class="si">%02d</span><span class="s2">.wav"</span> <span class="o">%</span> <span class="n">note</span><span class="p">),</span> <span class="n">fileformat</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">sampletype</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span>
    <span class="p">)</span>

    <span class="c1"># Synthesis, an exponential envelope modulating a slightly out-of-tune stereo oscillator.</span>
    <span class="n">env</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Adsr" title="pyo.lib.controls.Adsr"><span class="n">Adsr</span></a><span class="p">(</span><span class="n">attack</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span> <span class="n">decay</span><span class="o">=</span><span class="mf">0.15</span><span class="p">,</span> <span class="n">sustain</span><span class="o">=</span><span class="mf">0.7</span><span class="p">,</span> <span class="n">release</span><span class="o">=</span><span class="mf">1.7</span><span class="p">,</span> <span class="n">dur</span><span class="o">=</span><span class="n">dur</span><span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
    <a class="sphinx-codeautolink-a" href="../../api/classes/arithmetic.html#pyo.Pow" title="pyo.lib._core.Pow"><span class="n">qenv</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/arithmetic.html#pyo.Pow" title="pyo.lib._core.Pow"><span class="n">Pow</span></a><span class="p">(</span><span class="n">env</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.8</span><span class="p">)</span>
    <span class="n">osc1</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.SineLoop" title="pyo.lib.generators.SineLoop"><span class="n">SineLoop</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="n">noteFreq</span><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.075</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/arithmetic.html#pyo.Pow" title="pyo.lib._core.Pow"><span class="n">qenv</span></a><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
    <span class="n">osc2</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.SineLoop" title="pyo.lib.generators.SineLoop"><span class="n">SineLoop</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="n">noteFreq</span> <span class="o">*</span> <span class="mf">1.01</span><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.075</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/arithmetic.html#pyo.Pow" title="pyo.lib._core.Pow"><span class="n">qenv</span></a><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"># Start thw rendering.</span>
    <span class="n">s</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>

    <span class="c1"># Cleanup for the next pass.</span>
    <span class="n">s</span><span class="o">.</span><span class="n">shutdown</span><span class="p">()</span>

<span class="nb">print</span><span class="p">(</span><span class="s2">"Batch processing done!"</span><span class="p">)</span>
</pre></div>
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