Add examples/rtcp-processing

rtcp-processing demonstrates how to access RTCP Packets via ReadRTCP

Resolves #2027

examples/rtcp-processing/jsfiddle/demo.css

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+textarea {
+    width: 500px;
+    min-height: 75px;
+}

examples/rtcp-processing/jsfiddle/demo.details

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+---
+ name: rtcp-processing
+ description: play-from-disk demonstrates how to process RTCP messages from Pion WebRTC
+ authors:
+   - Sean DuBois

examples/rtcp-processing/jsfiddle/demo.html

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+Browser Session Description
+<br/>
+<textarea id="localSessionDescription" readonly="true"></textarea>
+<br/>
+
+<button onclick="window.copySessionDescription()">Copy browser Session Description to clipboard</button>
+
+<br/>
+<br/>
+<br/>
+
+Remote Session Description
+<br/>
+<textarea id="remoteSessionDescription"></textarea>
+<br/>
+<button onclick="window.startSession()">Start Session</button>
+<br/>
+<br/>
+
+Video<br />
+<video id="video1" width="160" height="120" autoplay muted></video> <br />
+
+Logs
+<br/>
+<div id="div"></div>

examples/rtcp-processing/jsfiddle/demo.js

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+/* eslint-env browser */
+
+const pc = new RTCPeerConnection({
+  iceServers: [{
+    urls: 'stun:stun.l.google.com:19302'
+  }]
+})
+const log = msg => {
+  document.getElementById('div').innerHTML += msg + '<br>'
+}
+
+pc.ontrack = function (event) {
+  const el = document.createElement(event.track.kind)
+  el.srcObject = event.streams[0]
+  el.autoplay = true
+  el.controls = true
+
+  document.getElementById('remoteVideos').appendChild(el)
+}
+
+pc.oniceconnectionstatechange = e => log(pc.iceConnectionState)
+pc.onicecandidate = event => {
+  if (event.candidate === null) {
+    document.getElementById('localSessionDescription').value = btoa(JSON.stringify(pc.localDescription))
+  }
+}
+
+navigator.mediaDevices.getUserMedia({ video: true, audio: true })
+  .then(stream => {
+    document.getElementById('video1').srcObject = stream
+    stream.getTracks().forEach(track => pc.addTrack(track, stream))
+
+    pc.createOffer().then(d => pc.setLocalDescription(d)).catch(log)
+  }).catch(log)
+
+window.startSession = () => {
+  const sd = document.getElementById('remoteSessionDescription').value
+  if (sd === '') {
+    return alert('Session Description must not be empty')
+  }
+
+  try {
+    pc.setRemoteDescription(new RTCSessionDescription(JSON.parse(atob(sd))))
+  } catch (e) {
+    alert(e)
+  }
+}
+
+window.copySessionDescription = () => {
+  const browserSessionDescription = document.getElementById('localSessionDescription')
+
+  browserSessionDescription.focus()
+  browserSessionDescription.select()
+
+  try {
+    const successful = document.execCommand('copy')
+    const msg = successful ? 'successful' : 'unsuccessful'
+    log('Copying SessionDescription was ' + msg)
+  } catch (err) {
+    log('Oops, unable to copy SessionDescription ' + err)
+  }
+}