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<section id="sending-and-receiving-data-with-osc-protocol">
<h1>Sending and receiving data with OSC protocol<a class="headerlink" href="#sending-and-receiving-data-with-osc-protocol" title="Permalink to this heading">¶</a></h1>
<p><strong>05-send-receive-data.py</strong></p>
<p>OscDataSend and OscDataReceive are objects that should be used to
send and receive Open Sound Control messages when message type is
not simple float or when the user want to process values before
sending using them to control an audio process.</p>
<p><strong>OscDataSend</strong> sends messages in the form of a list containing elements
according to its <cite>types</cite> argument. See the documentation of the object
for the various available types.</p>
<p><strong>OscDataReceive</strong> calls a function with the address as the first argument,
followed by a tuple containing every values of the data message.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">random</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>
<span class="c1"># Little audio process to control with OSC messages.</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="s2">"../snds/snd_1.aif"</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">freqs</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">SigTo</span></a><span class="p">([</span><span class="mi">100</span><span class="p">,</span> <span class="mi">200</span><span class="p">,</span> <span class="mi">300</span><span class="p">,</span> <span class="mi">400</span><span class="p">],</span> <span class="n">time</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
<span class="n">rezon</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Resonx" title="pyo.lib.filters.Resonx"><span class="n">Resonx</span></a><span class="p">(</span><span class="n">source</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="n">freq</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.SigTo" title="pyo.lib.controls.SigTo"><span class="n">freqs</span></a><span class="p">,</span> <span class="n">q</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">stages</span><span class="o">=</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="c1"># ----- Receiver -----</span>
<span class="c1"># Handle all messages coming from addresses starting with "/data/"</span>
<span class="k">def</span> <span class="nf">getDataMessage</span><span class="p">(</span><span class="n">address</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="k">if</span> <span class="n">address</span> <span class="o">==</span> <span class="s2">"/data/play"</span><span class="p">:</span>
<span class="c1"># Arguments are the sound to play as a string,</span>
<span class="c1"># speed and gain as floats.</span>
<span class="n">source</span><span class="o">.</span><span class="n">path</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">source</span><span class="o">.</span><span class="n">speed</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="n">source</span><span class="o">.</span><span class="n">mul</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span>
<span class="n">source</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
<span class="k">elif</span> <span class="n">address</span> <span class="o">==</span> <span class="s2">"/data/rezo"</span><span class="p">:</span>
<span class="c1"># Arguments are 4 frequencies as floats.</span>
<span class="n">freqs</span><span class="o">.</span><span class="n">value</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">args</span><span class="p">)</span>
<span class="c1"># OSC data receiver.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/opensndctrl.html#pyo.OscDataReceive" title="pyo.lib.opensndctrl.OscDataReceive"><span class="n">rec</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/opensndctrl.html#pyo.OscDataReceive" title="pyo.lib.opensndctrl.OscDataReceive"><span class="n">OscDataReceive</span></a><span class="p">(</span><span class="n">port</span><span class="o">=</span><span class="mi">9900</span><span class="p">,</span> <span class="n">address</span><span class="o">=</span><span class="s2">"/data/*"</span><span class="p">,</span> <span class="n">function</span><span class="o">=</span><span class="n">getDataMessage</span><span class="p">)</span>
<span class="c1"># ----- Sender 1 -----</span>
<span class="c1"># Builds and sends messages to load an play a new sound.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/opensndctrl.html#pyo.OscDataSend" title="pyo.lib.opensndctrl.OscDataSend"><span class="n">sender1</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/opensndctrl.html#pyo.OscDataSend" title="pyo.lib.opensndctrl.OscDataSend"><span class="n">OscDataSend</span></a><span class="p">(</span><span class="n">types</span><span class="o">=</span><span class="s2">"sff"</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="mi">9900</span><span class="p">,</span> <span class="n">address</span><span class="o">=</span><span class="s2">"/data/play"</span><span class="p">,</span> <span class="n">host</span><span class="o">=</span><span class="s2">"127.0.0.1"</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">choose</span><span class="p">():</span>
<span class="s2">"Chooses new soundfile values and starts playback."</span>
<span class="n">soundfile</span> <span class="o">=</span> <span class="s2">"../snds/snd_</span><span class="si">%i</span><span class="s2">.aif"</span> <span class="o">%</span> <span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">6</span><span class="p">)</span>
<span class="n">speed</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">choice</span><span class="p">([</span><span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.75</span><span class="p">,</span> <span class="mf">1.0</span><span class="p">,</span> <span class="mf">1.25</span><span class="p">])</span>
<span class="n">gain</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">0.5</span><span class="p">,</span> <span class="mf">0.7</span><span class="p">)</span>
<span class="c1"># Sends the message (message must be a list of values whose</span>
<span class="c1"># types respect the `types` argument of the OscDataSend object.</span>
<span class="n">sender1</span><span class="o">.</span><span class="n">send</span><span class="p">([</span><span class="n">soundfile</span><span class="p">,</span> <span class="n">speed</span><span class="p">,</span> <span class="n">gain</span><span class="p">])</span>
<span class="c1"># Adjusts the timing of the Pattern according to the playback duration.</span>
<span class="n">pat</span><span class="o">.</span><span class="n">time</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">soundfile</span><span class="p">)[</span><span class="mi">1</span><span class="p">]</span> <span class="o">/</span> <span class="n">speed</span>
<span class="c1"># Call the choose() function to set a new sound playback.</span>
<span class="n">pat</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.Pattern" title="pyo.lib.pattern.Pattern"><span class="n">Pattern</span></a><span class="p">(</span><span class="n">choose</span><span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
<span class="c1"># ----- Sender 2 -----</span>
<span class="c1"># Sends new frequencies to the resonator filters.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/opensndctrl.html#pyo.OscDataSend" title="pyo.lib.opensndctrl.OscDataSend"><span class="n">sender2</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/opensndctrl.html#pyo.OscDataSend" title="pyo.lib.opensndctrl.OscDataSend"><span class="n">OscDataSend</span></a><span class="p">(</span><span class="n">types</span><span class="o">=</span><span class="s2">"ffff"</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="mi">9900</span><span class="p">,</span> <span class="n">address</span><span class="o">=</span><span class="s2">"/data/rezo"</span><span class="p">,</span> <span class="n">host</span><span class="o">=</span><span class="s2">"127.0.0.1"</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">change</span><span class="p">():</span>
<span class="s2">"Randomly chooses new frequencies and sends them to the filters."</span>
<span class="n">sender2</span><span class="o">.</span><span class="n">send</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="mi">250</span><span class="p">,</span> <span class="mi">4000</span><span class="p">)</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">4</span><span class="p">)])</span>
<span class="c1"># Call the change() function every 2 seconds.</span>
<span class="n">pat2</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.Pattern" title="pyo.lib.pattern.Pattern"><span class="n">Pattern</span></a><span class="p">(</span><span class="n">change</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">play</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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