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<section id="offline-processing-of-multiple-audio-files-in-batch">
<h1>Offline processing of multiple audio files in batch<a class="headerlink" href="#offline-processing-of-multiple-audio-files-in-batch" title="Permalink to this heading">¶</a></h1>
<p><strong>05-batch-processing.py</strong></p>
<p>This program demonstrates how to use pyo to do offline batch processing
given a folder of sounds.</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">audio</span><span class="o">=</span><span class="s2">"offline"</span><span class="p">)</span>

<span class="c1"># Path to your sound folder (SNDS_PATH is a folder containing a few sounds installed with pyo,</span>
<span class="c1"># you can change this path to try with your own sounds).</span>
<span class="n">folder_path</span> <span class="o">=</span> <span class="n">SNDS_PATH</span>

<span class="c1"># Path to the processed sounds folder (user's home directory/pyo_batch_fx/).</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_fx"</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"># Get the list of audio files to process.</span>
<span class="n">sounds</span> <span class="o">=</span> <span class="p">[</span><span class="n">f</span> <span class="k">for</span> <span class="n">f</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="n">folder_path</span><span class="p">)</span> <span class="k">if</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">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">folder_path</span><span class="p">,</span> <span class="n">f</span><span class="p">))</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">]</span>

<span class="c1"># Enter the batch processing loop.</span>
<span class="k">for</span> <span class="n">sound</span> <span class="ow">in</span> <span class="n">sounds</span><span class="p">:</span>
    <span class="c1"># Retrieve info about the sound from its header.</span>
    <span class="n">path</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">folder_path</span><span class="p">,</span> <span class="n">sound</span><span class="p">)</span>
    <span class="n">info</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="n">dur</span><span class="p">,</span> <span class="n">sr</span><span class="p">,</span> <span class="n">chnls</span> <span class="o">=</span> <span class="n">info</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">info</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">info</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span>
    <span class="n">fformat</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"WAVE"</span><span class="p">,</span> <span class="s2">"AIFF"</span><span class="p">,</span> <span class="s2">"AU"</span><span class="p">,</span> <span class="s2">"RAW"</span><span class="p">,</span> <span class="s2">"SD2"</span><span class="p">,</span> <span class="s2">"FLAC"</span><span class="p">,</span> <span class="s2">"CAF"</span><span class="p">,</span> <span class="s2">"OGG"</span><span class="p">]</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">info</span><span class="p">[</span><span class="mi">4</span><span class="p">])</span>
    <span class="n">samptype</span> <span class="o">=</span> <span class="p">[</span>
        <span class="s2">"16 bit int"</span><span class="p">,</span>
        <span class="s2">"24 bit int"</span><span class="p">,</span>
        <span class="s2">"32 bit int"</span><span class="p">,</span>
        <span class="s2">"32 bit float"</span><span class="p">,</span>
        <span class="s2">"64 bits float"</span><span class="p">,</span>
        <span class="s2">"U-Law encoded"</span><span class="p">,</span>
        <span class="s2">"A-Law encoded"</span><span class="p">,</span>
    <span class="p">]</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">info</span><span class="p">[</span><span class="mi">5</span><span class="p">])</span>

    <span class="c1"># Set server parameters according to the current sound info.</span>
    <span class="n">s</span><span class="o">.</span><span class="n">setSamplingRate</span><span class="p">(</span><span class="n">sr</span><span class="p">)</span>
    <span class="n">s</span><span class="o">.</span><span class="n">setNchnls</span><span class="p">(</span><span class="n">chnls</span><span class="p">)</span>
    <span class="n">s</span><span class="o">.</span><span class="n">boot</span><span class="p">()</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="mi">1</span><span class="p">,</span>  <span class="c1"># give some room for the reverb trail!</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="n">sound</span><span class="p">),</span>
        <span class="n">fileformat</span><span class="o">=</span><span class="n">fformat</span><span class="p">,</span>
        <span class="n">sampletype</span><span class="o">=</span><span class="n">samptype</span><span class="p">,</span>
    <span class="p">)</span>

    <span class="c1"># Simple processing applied to the sound.</span>
    <a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">source</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">SfPlayer</span></a><span class="p">(</span><span class="n">path</span><span class="p">)</span>
    <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.ButBP" title="pyo.lib.filters.ButBP"><span class="n">bandpass</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.ButBP" title="pyo.lib.filters.ButBP"><span class="n">ButBP</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">source</span></a><span class="p">,</span> <span class="mi">1000</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span>
    <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Disto" title="pyo.lib.effects.Disto"><span class="n">disto</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Disto" title="pyo.lib.effects.Disto"><span class="n">Disto</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.ButBP" title="pyo.lib.filters.ButBP"><span class="n">bandpass</span></a><span class="p">,</span> <span class="n">drive</span><span class="o">=</span><span class="mf">0.9</span><span class="p">,</span> <span class="n">slope</span><span class="o">=</span><span class="mf">0.8</span><span class="p">)</span>
    <span class="n">output</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.WGVerb" title="pyo.lib.effects.WGVerb"><span class="n">WGVerb</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">source</span></a> <span class="o">+</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Disto" title="pyo.lib.effects.Disto"><span class="n">disto</span></a><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.8</span><span class="p">,</span> <span class="n">cutoff</span><span class="o">=</span><span class="mi">5000</span><span class="p">,</span> <span class="n">bal</span><span class="o">=</span><span class="mf">0.25</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="o">.</span><span class="n">out</span><span class="p">()</span>

    <span class="c1"># Start the 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>
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