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<section id="launching-the-audio-processing-in-a-separated-thread">
<h1>Launching the audio processing in a separated thread<a class="headerlink" href="#launching-the-audio-processing-in-a-separated-thread" title="Permalink to this heading">¶</a></h1>
<p><strong>08-multiple-threads.py</strong></p>
<p>This program launches an audio process in a separated thread with the
subprocess module and sends parameters to its standard input to control
the sound playback.</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">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="kn">import</span> <span class="nn">random</span>
<span class="kn">import</span> <span class="nn">subprocess</span>

<span class="c1"># Get the python command according to the current operating system.</span>
<span class="k">if</span> <span class="n">sys</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">"win"</span><span class="p">):</span>
    <span class="n">PYTHON_EXE</span> <span class="o">=</span> <span class="s2">"py -</span><span class="si">%d</span><span class="s2">.</span><span class="si">%d</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="k">else</span><span class="p">:</span>
    <span class="n">PYTHON_EXE</span> <span class="o">=</span> <span class="s2">"python</span><span class="si">%d</span><span class="s2">.</span><span class="si">%d</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>

<span class="c1"># Path of the python file to run in the subprocess.</span>
<span class="n">script_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">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">"08_multiple_threads_process.py"</span><span class="p">)</span>

<span class="c1"># Thread's processing... Soundfile player + delay + reverb.</span>
<span class="n">script</span> <span class="o">=</span> <span class="s2">"""</span>
<span class="s2">from pyo import *</span>

<span class="s2">s = Server(duplex=0).boot()</span>

<span class="s2">sf = SfPlayer('../snds/snd_1.aif', mul=0.7)</span>
<span class="s2">dd = SmoothDelay(sf, delay=0.25, feedback=0.5)</span>
<span class="s2">rv = STRev(sf+dd, inpos=0.50, revtime=1.5, cutoff=5000, bal=0.25).out()</span>

<span class="s2">s.start()</span>
<span class="s2">"""</span>

<span class="c1"># Create the python file to run in the subprocess.</span>
<span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="n">script_path</span><span class="p">,</span> <span class="s2">"w"</span><span class="p">)</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">script</span><span class="p">)</span>
<span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>

<span class="c1"># Launch an interactive python (-i flag) in a subprocess and store a</span>
<span class="c1"># reference to the standard input to pass message to the running process.</span>
<span class="n">pipe</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">(</span>
    <span class="p">[</span><span class="s2">"</span><span class="si">%s</span><span class="s2"> -i </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">PYTHON_EXE</span><span class="p">,</span> <span class="n">script_path</span><span class="p">)],</span> <span class="n">shell</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">universal_newlines</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">,</span>
<span class="p">)</span><span class="o">.</span><span class="n">stdin</span>

<span class="c1"># Wait for the audio server to be ready.</span>
<span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>

<span class="c1"># Send events to the subprocess.</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="mi">20</span><span class="p">):</span>
    <span class="c1"># Randomly choose a sound (snd_1.aif to snd_6.aif).</span>
    <span class="n">snd</span> <span class="o">=</span> <span class="s2">"../snds/snd_</span><span class="si">%d</span><span class="s2">.aif"</span> <span class="o">%</span> <span class="n">random</span><span class="o">.</span><span class="n">randrange</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">7</span><span class="p">)</span>

    <span class="c1"># Replace the sound and start the playback.</span>
    <span class="n">pipe</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s2">"sf.path = '</span><span class="si">%s</span><span class="s2">'</span><span class="se">\n</span><span class="s2">dump = sf.play()</span><span class="se">\n</span><span class="s2">"</span> <span class="o">%</span> <span class="n">snd</span><span class="p">)</span>
    <span class="n">pipe</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s2">"dd.delay = </span><span class="si">%f</span><span class="se">\n</span><span class="s2">"</span> <span class="o">%</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">))</span>
    <span class="n">pipe</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>

    <span class="c1"># Wait some time before the next event.</span>
    <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.5</span><span class="p">,</span> <span class="mi">1</span><span class="p">))</span>

<span class="c1"># Stop the audio Server before exiting.</span>
<span class="n">pipe</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s2">"s.stop()</span><span class="se">\n</span><span class="s2">time.sleep(0.25)</span><span class="se">\n</span><span class="s2">"</span><span class="p">)</span>

<span class="c1"># Close the subprocess.</span>
<span class="n">pipe</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>

<span class="c1"># Delete the python file.</span>
<span class="n">os</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">script_path</span><span class="p">)</span>
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