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<section id="sharing-a-table-with-a-numpy-array-using-the-buffer-protocol">
<h1>Sharing a table with a numpy array using the buffer protocol<a class="headerlink" href="#sharing-a-table-with-a-numpy-array-using-the-buffer-protocol" title="Permalink to this heading">¶</a></h1>
<p><strong>04-buffer-interface.py</strong></p>
<p>This example shows two things:</p>
<ol class="arabic simple">
<li><p>How to share memory from a PyoTableObject to a numpy array with the
<cite>getBuffer()</cite> method of the PyoTableObject. Numpy functions can then
be used to modify the table’s content without copying every samples.</p></li>
<li><p>How to register a <cite>callback</cite> function, with the <cite>setCallback()</cite> method
of the Server object, that the server will call at the beginning of
every processing loop (each <cite>buffersize</cite> samples).</p></li>
</ol>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The numpy module <strong>must</strong> be installed for this example to work.</p>
</div>
<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="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</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"># Get the length of an audio block.</span>
<span class="n">bs</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">getBufferSize</span><span class="p">()</span>
<span class="c1"># Create a table of length `buffer size` and read it in loop.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.DataTable" title="pyo.lib.tables.DataTable"><span class="n">t</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.DataTable" title="pyo.lib.tables.DataTable"><span class="n">DataTable</span></a><span class="p">(</span><span class="n">size</span><span class="o">=</span><span class="n">bs</span><span class="p">)</span>
<span class="n">osc</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.TableRead" title="pyo.lib.tableprocess.TableRead"><span class="n">TableRead</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.DataTable" title="pyo.lib.tables.DataTable"><span class="n">t</span></a><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><span class="n">t</span><span class="o">.</span><span class="n">getRate</span><span class="p">(),</span> <span class="n">loop</span><span class="o">=</span><span class="kc">True</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="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="c1"># Share the table's memory with a numpy array.</span>
<span class="n">arr</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">asarray</span><span class="p">(</span><span class="n">t</span><span class="o">.</span><span class="n">getBuffer</span><span class="p">())</span>
<span class="k">def</span> <span class="nf">process</span><span class="p">():</span>
<span class="s2">"Fill the array (so the table) with white noise."</span>
<span class="n">arr</span><span class="p">[:]</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">normal</span><span class="p">(</span><span class="mf">0.0</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="n">bs</span><span class="p">)</span>
<span class="c1"># Register the `process` function to be called at the beginning</span>
<span class="c1"># of every processing loop.</span>
<span class="n">s</span><span class="o">.</span><span class="n">setCallback</span><span class="p">(</span><span class="n">process</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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