snapshot of https://github.com/pion/webrtc.git (main, 2026-09-15; blobs > 131072B omitted)

examples/simulcast/jsfiddle/demo.js

@@ -0,0 +1,110 @@
+/* eslint-env browser */
+
+// SPDX-FileCopyrightText: 2026 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+// Create peer conn
+const pc = new RTCPeerConnection({
+  iceServers: [{
+    urls: 'stun:stun.l.google.com:19302'
+  }]
+})
+
+pc.oniceconnectionstatechange = (e) => {
+  console.log('connection state change', pc.iceConnectionState)
+}
+pc.onicecandidate = (event) => {
+  if (event.candidate === null) {
+    document.getElementById('localSessionDescription').value = btoa(
+      JSON.stringify(pc.localDescription)
+    )
+  }
+}
+
+pc.onnegotiationneeded = (e) =>
+  pc
+    .createOffer()
+    .then((d) => pc.setLocalDescription(d))
+    .catch(console.error)
+
+pc.ontrack = (event) => {
+  console.log('Got track event', event)
+  const video = document.createElement('video')
+  video.srcObject = event.streams[0]
+  video.autoplay = true
+  video.width = '500'
+  const label = document.createElement('div')
+  label.textContent = event.streams[0].id
+  document.getElementById('serverVideos').appendChild(label)
+  document.getElementById('serverVideos').appendChild(video)
+}
+
+navigator.mediaDevices
+  .getUserMedia({
+    video: {
+      width: {
+        ideal: 4096
+      },
+      height: {
+        ideal: 2160
+      },
+      frameRate: {
+        ideal: 60,
+        min: 10
+      }
+    },
+    audio: false
+  })
+  .then((stream) => {
+    document.getElementById('browserVideo').srcObject = stream
+    pc.addTransceiver(stream.getVideoTracks()[0], {
+      direction: 'sendonly',
+      streams: [stream],
+      sendEncodings: [
+        // for firefox order matters... first high resolution, then scaled resolutions...
+        {
+          rid: 'f'
+        },
+        {
+          rid: 'h',
+          scaleResolutionDownBy: 2.0
+        },
+        {
+          rid: 'q',
+          scaleResolutionDownBy: 4.0
+        }
+      ]
+    })
+    pc.addTransceiver('video')
+    pc.addTransceiver('video')
+    pc.addTransceiver('video')
+  })
+
+window.startSession = () => {
+  const sd = document.getElementById('remoteSessionDescription').value
+  if (sd === '') {
+    return alert('Session Description must not be empty')
+  }
+
+  try {
+    console.log('answer', JSON.parse(atob(sd)))
+    pc.setRemoteDescription(JSON.parse(atob(sd)))
+  } catch (e) {
+    alert(e)
+  }
+}
+
+window.copySDP = () => {
+  const browserSDP = document.getElementById('localSessionDescription')
+
+  browserSDP.focus()
+  browserSDP.select()
+
+  try {
+    const successful = document.execCommand('copy')
+    const msg = successful ? 'successful' : 'unsuccessful'
+    console.log('Copying SDP was ' + msg)
+  } catch (err) {
+    console.log('Unable to copy SDP ' + err)
+  }
+}