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<h1 id="fastrtc-docs">FastRTC Docs</h1>
<h2 id="connecting">Connecting</h2>
<p _="%" endif="endif">To connect to the server, you need to create a new RTCPeerConnection object and call the <code>setupWebRTC</code> function below.
{% if mode in ["send-receive", "receive"] %}
This code snippet assumes there is an html element with an id of <code>{{ modality }}_output_component_id</code> where the output will be displayed. It should be {{ "a <code>&lt;audio&gt;</code>" if modality == "audio" else "an <code>&lt;video&gt;</code>"}} element.</p>
<div class="language-js highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1">// pass any rtc_configuration params here</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kd">const</span><span class="w"> </span><span class="nx">pc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nx">RTCPeerConnection</span><span class="p">();</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="p">{</span><span class="o">%</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">mode</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;send-receive&quot;</span><span class="p">,</span><span class="w"> </span><span class="s2">&quot;receive&quot;</span><span class="p">]</span><span class="w"> </span><span class="o">%</span><span class="p">}</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="kd">const</span><span class="w"> </span><span class="p">{{</span><span class="nx">modality</span><span class="p">}}</span><span class="nx">_output_component</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s2">&quot;{{modality}}_output_component_id&quot;</span><span class="p">);</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="p">{</span><span class="o">%</span><span class="w"> </span><span class="nx">endif</span><span class="w"> </span><span class="o">%</span><span class="p">}</span><span class="w"> </span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="k">async</span><span class="w"> </span><span class="kd">function</span><span class="w"> </span><span class="nx">setupWebRTC</span><span class="p">(</span><span class="nx">peerConnection</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w"> </span><span class="p">{</span><span class="o">%-</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">mode</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;send-receive&quot;</span><span class="p">,</span><span class="w"> </span><span class="s2">&quot;send&quot;</span><span class="p">]</span><span class="w"> </span><span class="o">-%</span><span class="p">}</span><span class="w"> </span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="c1">// Get {{modality}} stream from webcam</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">stream</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">navigator</span><span class="p">.</span><span class="nx">mediaDevices</span><span class="p">.</span><span class="nx">getUserMedia</span><span class="p">({</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="p">{{</span><span class="nx">modality</span><span class="p">}}</span><span class="o">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="p">})</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="p">{</span><span class="o">%-</span><span class="w"> </span><span class="nx">endif</span><span class="w"> </span><span class="o">-%</span><span class="p">}</span>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="p">{</span><span class="o">%</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">mode</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="s2">&quot;send-receive&quot;</span><span class="w"> </span><span class="o">%</span><span class="p">}</span>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="c1">// Send {{ self.modality }} stream to server</span>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="w"> </span><span class="nx">stream</span><span class="p">.</span><span class="nx">getTracks</span><span class="p">().</span><span class="nx">forEach</span><span class="p">(</span><span class="k">async</span><span class="w"> </span><span class="p">(</span><span class="nx">track</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">sender</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">pc</span><span class="p">.</span><span class="nx">addTrack</span><span class="p">(</span><span class="nx">track</span><span class="p">,</span><span class="w"> </span><span class="nx">stream</span><span class="p">);</span>
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="p">})</span>
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="p">{</span><span class="o">%</span><span class="w"> </span><span class="nx">elif</span><span class="w"> </span><span class="nx">mode</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="s2">&quot;send&quot;</span><span class="w"> </span><span class="o">%</span><span class="p">}</span>
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="c1">// Receive {self.modality} stream from server</span>
</span><span id="__span-0-21"><a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="nx">pc</span><span class="p">.</span><span class="nx">addTransceiver</span><span class="p">({{</span><span class="nx">modality</span><span class="p">}},</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">direction</span><span class="o">:</span><span class="w"> </span><span class="s2">&quot;recvonly&quot;</span><span class="w"> </span><span class="p">})</span>
</span><span id="__span-0-22"><a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="w"> </span><span class="p">{</span><span class="o">%-</span><span class="w"> </span><span class="nx">endif</span><span class="w"> </span><span class="o">-%</span><span class="p">}</span>
</span><span id="__span-0-23"><a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="w"> </span><span class="p">{</span><span class="o">%</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="nx">mode</span><span class="w"> </span><span class="ow">in</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;send-receive&quot;</span><span class="p">,</span><span class="w"> </span><span class="s2">&quot;receive&quot;</span><span class="p">]</span><span class="w"> </span><span class="o">%</span><span class="p">}</span>
</span><span id="__span-0-24"><a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="w"> </span><span class="nx">peerConnection</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">(</span><span class="s2">&quot;track&quot;</span><span class="p">,</span><span class="w"> </span><span class="p">(</span><span class="nx">evt</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-25"><a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">({{</span><span class="nx">modality</span><span class="p">}}</span><span class="nx">_output_component</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span>
</span><span id="__span-0-26"><a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="w"> </span><span class="p">{{</span><span class="nx">modality</span><span class="p">}}</span><span class="nx">_output_component</span><span class="p">.</span><span class="nx">srcObject</span><span class="w"> </span><span class="o">!==</span><span class="w"> </span><span class="nx">evt</span><span class="p">.</span><span class="nx">streams</span><span class="p">[</span><span class="mf">0</span><span class="p">])</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-27"><a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="w"> </span><span class="p">{{</span><span class="nx">modality</span><span class="p">}}</span><span class="nx">_output_component</span><span class="p">.</span><span class="nx">srcObject</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">evt</span><span class="p">.</span><span class="nx">streams</span><span class="p">[</span><span class="mf">0</span><span class="p">];</span>
</span><span id="__span-0-28"><a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-0-29"><a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a><span class="w"> </span><span class="p">});</span>
</span><span id="__span-0-30"><a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="w"> </span><span class="p">{</span><span class="o">%</span><span class="w"> </span><span class="nx">endif</span><span class="w"> </span><span class="o">%</span><span class="p">}</span>
</span><span id="__span-0-31"><a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="w"> </span><span class="c1">// Create data channel (needed!)</span>
</span><span id="__span-0-32"><a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">dataChannel</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">peerConnection</span><span class="p">.</span><span class="nx">createDataChannel</span><span class="p">(</span><span class="s2">&quot;text&quot;</span><span class="p">);</span>
</span><span id="__span-0-33"><a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a>
</span><span id="__span-0-34"><a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="w"> </span><span class="c1">// Create and send offer</span>
</span><span id="__span-0-35"><a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">offer</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">peerConnection</span><span class="p">.</span><span class="nx">createOffer</span><span class="p">();</span>
</span><span id="__span-0-36"><a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">peerConnection</span><span class="p">.</span><span class="nx">setLocalDescription</span><span class="p">(</span><span class="nx">offer</span><span class="p">);</span>
</span><span id="__span-0-37"><a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a>
</span><span id="__span-0-38"><a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="w"> </span><span class="c1">// Send offer to server</span>
</span><span id="__span-0-39"><a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">response</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">fetch</span><span class="p">(</span><span class="s1">&#39;/webrtc/offer&#39;</span><span class="p">,</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-40"><a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a><span class="w"> </span><span class="nx">method</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;POST&#39;</span><span class="p">,</span>
</span><span id="__span-0-41"><a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a><span class="w"> </span><span class="nx">headers</span><span class="o">:</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="s1">&#39;Content-Type&#39;</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;application/json&#39;</span><span class="w"> </span><span class="p">},</span>
</span><span id="__span-0-42"><a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a><span class="w"> </span><span class="nx">body</span><span class="o">:</span><span class="w"> </span><span class="nb">JSON</span><span class="p">.</span><span class="nx">stringify</span><span class="p">({</span>
</span><span id="__span-0-43"><a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a><span class="w"> </span><span class="nx">sdp</span><span class="o">:</span><span class="w"> </span><span class="nx">offer</span><span class="p">.</span><span class="nx">sdp</span><span class="p">,</span>
</span><span id="__span-0-44"><a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a><span class="w"> </span><span class="nx">type</span><span class="o">:</span><span class="w"> </span><span class="nx">offer</span><span class="p">.</span><span class="nx">type</span><span class="p">,</span>
</span><span id="__span-0-45"><a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a><span class="w"> </span><span class="nx">webrtc_id</span><span class="o">:</span><span class="w"> </span><span class="nb">Math</span><span class="p">.</span><span class="nx">random</span><span class="p">().</span><span class="nx">toString</span><span class="p">(</span><span class="mf">36</span><span class="p">).</span><span class="nx">substring</span><span class="p">(</span><span class="mf">7</span><span class="p">)</span>
</span><span id="__span-0-46"><a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a><span class="w"> </span><span class="p">})</span>
</span><span id="__span-0-47"><a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a><span class="w"> </span><span class="p">});</span>
</span><span id="__span-0-48"><a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a>
</span><span id="__span-0-49"><a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a><span class="w"> </span><span class="c1">// Handle server response</span>
</span><span id="__span-0-50"><a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">serverResponse</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">response</span><span class="p">.</span><span class="nx">json</span><span class="p">();</span>
</span><span id="__span-0-51"><a id="__codelineno-0-51" name="__codelineno-0-51" href="#__codelineno-0-51"></a><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nx">peerConnection</span><span class="p">.</span><span class="nx">setRemoteDescription</span><span class="p">(</span><span class="nx">serverResponse</span><span class="p">);</span>
</span><span id="__span-0-52"><a id="__codelineno-0-52" name="__codelineno-0-52" href="#__codelineno-0-52"></a><span class="p">}</span>
</span></code></pre></div>
<p>{%if additional_inputs %}</p>
<h2 id="sending-input-data">Sending Input Data</h2>
<p>Your python handler can request additional data from the frontend by calling the <code>fetch_args()</code> method (see <a href="#add docs">here</a>).</p>
<p>This will send a <code>send_input</code> message over the WebRTC data channel.
Upon receiving this message, you should trigger the <code>set_input</code> hook of your stream.
A simple way to do this is with a <code>POST</code> request.</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="nd">@stream</span><span class="o">.</span><span class="n">post</span><span class="p">(</span><span class="s2">&quot;/input_hook&quot;</span><span class="p">)</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="k">def</span><span class="w"> </span><span class="nf">_</span><span class="p">(</span><span class="n">data</span><span class="p">:</span> <span class="n">PydanticBody</span><span class="p">):</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a> <span class="n">stream</span><span class="o">.</span><span class="n">set_inputs</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">webrtc_id</span><span class="p">,</span> <span class="n">data</span><span class="o">.</span><span class="n">inputs</span><span class="p">)</span>
</span></code></pre></div>
<p>And then in your client code:</p>
<div class="language-js highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kd">const</span><span class="w"> </span><span class="nx">data_channel</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">peerConnection</span><span class="p">.</span><span class="nx">createDataChannel</span><span class="p">(</span><span class="s2">&quot;text&quot;</span><span class="p">);</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="nx">data_channel</span><span class="p">.</span><span class="nx">onmessage</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="nx">event</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="nx">event_json</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">JSON</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="nx">event</span><span class="p">.</span><span class="nx">data</span><span class="p">);</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="nx">event_json</span><span class="p">.</span><span class="nx">type</span><span class="w"> </span><span class="o">===</span><span class="w"> </span><span class="s2">&quot;send_input&quot;</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="nx">fetch</span><span class="p">(</span><span class="s1">&#39;/input_hook&#39;</span><span class="p">,</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="nx">method</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;POST&#39;</span><span class="p">,</span>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="nx">headers</span><span class="o">:</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="w"> </span><span class="s1">&#39;Content-Type&#39;</span><span class="o">:</span><span class="w"> </span><span class="s1">&#39;application/json&#39;</span><span class="p">,</span>
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="p">},</span>
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="nx">body</span><span class="o">:</span><span class="w"> </span><span class="nx">inputs</span>
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="w"> </span><span class="p">)</span>
</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a><span class="w"> </span><span class="p">};</span>
</span><span id="__span-2-15"><a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a><span class="w"> </span><span class="p">};</span>
</span></code></pre></div>
<p>The <code>set_inputs</code> hook will set the <code>latest_args</code> property of your stream to whatever the second argument is.</p>
<p>NOTE: It is completely up to you how you want to call the <code>set_inputs</code> hook.
Here we use a <code>POST</code> request but you can use a websocket or any other protocol.</p>
<p>{% endif %}</p>
<p>{% if additional_outputs %}</p>
<h2 id="fetching-output-data">Fetching Output Data</h2>
<p>Your python handler can send additional data to the front end by returning or yielding <code>AdditionalOutputs(...)</code>. See the <a href="https://freddyaboulton.github.io/gradio-webrtc/user-guide/#additional-outputs">docs</a>.</p>
<p>Your front end can fetch these outputs by calling the <code>get_outputs</code> hook of the <code>Stream</code>.
Here is an example using <code>server-sent-events</code>:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="nd">@stream</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/outputs&quot;</span><span class="p">)</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="k">def</span><span class="w"> </span><span class="nf">_</span><span class="p">(</span><span class="n">webrtc_id</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get_outputs</span><span class="p">():</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a> <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a> <span class="k">for</span> <span class="n">output</span> <span class="ow">in</span> <span class="n">stream</span><span class="o">.</span><span class="n">get_output</span><span class="p">(</span><span class="n">webrtc_id</span><span class="p">):</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a> <span class="c1"># Serialize to a string prior to this step</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a> <span class="k">yield</span> <span class="sa">f</span><span class="s2">&quot;data: </span><span class="si">{</span><span class="n">output</span><span class="si">}</span><span class="se">\n\n</span><span class="s2">&quot;</span>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a> <span class="k">await</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a> <span class="k">return</span> <span class="n">StreamingResponse</span><span class="p">(</span><span class="n">get_outputs</span><span class="p">(),</span> <span class="n">media_type</span><span class="o">=</span><span class="s2">&quot;text/event-stream&quot;</span><span class="p">)</span>
</span></code></pre></div>
<p>NOTE: It is completely up to you how you want to call the <code>get_output</code> hook.
Here we use a <code>server-sent-events</code> but you can use whatever protocol you want!</p>
<p>{% endif %}</p>
<h2 id="stopping">Stopping</h2>
<p>You can stop the stream by calling the following function:</p>
<div class="language-js highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="kd">function</span><span class="w"> </span><span class="nx">stop</span><span class="p">(</span><span class="nx">pc</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="w"> </span><span class="c1">// close transceivers</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="nx">pc</span><span class="p">.</span><span class="nx">getTransceivers</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="w"> </span><span class="nx">pc</span><span class="p">.</span><span class="nx">getTransceivers</span><span class="p">().</span><span class="nx">forEach</span><span class="p">((</span><span class="nx">transceiver</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="nx">transceiver</span><span class="p">.</span><span class="nx">stop</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a><span class="w"> </span><span class="nx">transceiver</span><span class="p">.</span><span class="nx">stop</span><span class="p">();</span>
</span><span id="__span-4-7"><a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="w"> </span><span class="p">});</span>
</span><span id="__span-4-9"><a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-4-10"><a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a>
</span><span id="__span-4-11"><a id="__codelineno-4-11" name="__codelineno-4-11" href="#__codelineno-4-11"></a><span class="w"> </span><span class="c1">// close local audio / video</span>
</span><span id="__span-4-12"><a id="__codelineno-4-12" name="__codelineno-4-12" href="#__codelineno-4-12"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="nx">pc</span><span class="p">.</span><span class="nx">getSenders</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-13"><a id="__codelineno-4-13" name="__codelineno-4-13" href="#__codelineno-4-13"></a><span class="w"> </span><span class="nx">pc</span><span class="p">.</span><span class="nx">getSenders</span><span class="p">().</span><span class="nx">forEach</span><span class="p">((</span><span class="nx">sender</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-14"><a id="__codelineno-4-14" name="__codelineno-4-14" href="#__codelineno-4-14"></a><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="nx">sender</span><span class="p">.</span><span class="nx">track</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="nx">sender</span><span class="p">.</span><span class="nx">track</span><span class="p">.</span><span class="nx">stop</span><span class="p">)</span><span class="w"> </span><span class="nx">sender</span><span class="p">.</span><span class="nx">track</span><span class="p">.</span><span class="nx">stop</span><span class="p">();</span>
</span><span id="__span-4-15"><a id="__codelineno-4-15" name="__codelineno-4-15" href="#__codelineno-4-15"></a><span class="w"> </span><span class="p">});</span>
</span><span id="__span-4-16"><a id="__codelineno-4-16" name="__codelineno-4-16" href="#__codelineno-4-16"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-4-17"><a id="__codelineno-4-17" name="__codelineno-4-17" href="#__codelineno-4-17"></a>
</span><span id="__span-4-18"><a id="__codelineno-4-18" name="__codelineno-4-18" href="#__codelineno-4-18"></a><span class="w"> </span><span class="c1">// close peer connection</span>
</span><span id="__span-4-19"><a id="__codelineno-4-19" name="__codelineno-4-19" href="#__codelineno-4-19"></a><span class="w"> </span><span class="nx">setTimeout</span><span class="p">(()</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-4-20"><a id="__codelineno-4-20" name="__codelineno-4-20" href="#__codelineno-4-20"></a><span class="w"> </span><span class="nx">pc</span><span class="p">.</span><span class="nx">close</span><span class="p">();</span>
</span><span id="__span-4-21"><a id="__codelineno-4-21" name="__codelineno-4-21" href="#__codelineno-4-21"></a><span class="w"> </span><span class="p">},</span><span class="w"> </span><span class="mf">500</span><span class="p">);</span>
</span><span id="__span-4-22"><a id="__codelineno-4-22" name="__codelineno-4-22" href="#__codelineno-4-22"></a><span class="p">}</span>
</span></code></pre></div>
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