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HTML 

              
                <head>
  <script src="https://web-broadcast.live-video.net/1.1.0/amazon-ivs-web-broadcast.js"></script>
</head>

<body class="container-fluid p-3">

  <div class="row">
    <div class="col-sm-6 offset-sm-3">
      <span class="badge bg-info fs-3 d-none mb-3 w-100" id="online-indicator">Online</span>
      <canvas id="broadcast-preview" class="rounded-4 shadow w-100"></canvas>
    </div>
  </div>

  <div class="d-flex flex-column col-sm-6 offset-sm-3 p-1">
    <select name="cam-select" id="cam-select" class="form-select w-100 mb-3"></select>
    <select name="mic-select" id="mic-select" class="form-select w-100 mb-3"></select> 
    <input type="text" name="endpoint" id="endpoint" class="form-control w-100 mb-3" placeholder="Ingest Endpoint" />
    <input type="password" name="stream-key" id="stream-key" class="form-control w-100 mb-3" placeholder="Stream Key" />
    <button class="btn btn-primary w-100 shadow mb-3" id="stream-btn">Stream</button>
    <button id="screenshare-btn" class="btn btn-outline-primary mb-3">Share Screen</button>
    <button id="overlay-btn" class="btn btn-secondary">Overlay</button>
  </div>
  
</body>
!

CSS
!

JS 

              
                const init = async () => {
  
  await handlePermissions();
  await getDevices();

  window.broadcastClient = IVSBroadcastClient.create({
    streamConfig: IVSBroadcastClient.STANDARD_LANDSCAPE,
  });

  await createVideoStream();
  await createAudioStream();
  
  previewVideo();
  
  document.getElementById('cam-select').addEventListener('change', selectCamera);
  document.getElementById('mic-select').addEventListener('change', selectMic);
  document.getElementById('stream-btn').addEventListener('click', toggleBroadcast);
  document.getElementById('screenshare-btn').addEventListener('click', toggleScreenshare);
  document.getElementById('overlay-btn').addEventListener('click', showOverlay);
};

const handlePermissions = async () => {
  let permissions = { video: true, audio: true };
  try {
    await navigator.mediaDevices.getUserMedia(permissions);
  }
  catch (err) {
    console.error(err.message);
    permissions = { video: false, audio: false };
  }
  if (!permissions.video) console.error('Failed to get video permissions.');
  if (!permissions.audio) console.error('Failed to get audio permissions.');
};

const getDevices = async () => {
  const cameraSelect = document.getElementById('cam-select');
  const micSelect = document.getElementById('mic-select');
  const devices = await navigator.mediaDevices.enumerateDevices();
  const videoDevices = devices.filter((d) => d.kind === 'videoinput');
  const audioDevices = devices.filter((d) => d.kind === 'audioinput');
  videoDevices.forEach((device, idx) => {
    const opt = document.createElement('option');
    opt.value = device.deviceId;
    opt.innerHTML = device.label;
    if (idx === 0) {
      window.selectedVideoDeviceId = device.deviceId;
      opt.selected = true;
    }
    cameraSelect.appendChild(opt);
  });
  audioDevices.forEach((device, idx) => {
    const opt = document.createElement('option');
    opt.value = device.deviceId;
    opt.innerHTML = device.label;
    if (idx === 0) {
      window.selectedAudioDeviceId = device.deviceId;
      opt.selected = true;
    }
    micSelect.appendChild(opt);
  });
};

const createVideoStream = async () => {
  if (window.broadcastClient && window.broadcastClient.getVideoInputDevice('camera1')) window.broadcastClient.removeVideoInputDevice('camera1');
  const streamConfig = IVSBroadcastClient.STANDARD_LANDSCAPE;
  window.videoStream = await navigator.mediaDevices.getUserMedia({
    video: {
      deviceId: { exact: window.selectedVideoDeviceId },
      width: {
        ideal: streamConfig.maxResolution.width,
        max: streamConfig.maxResolution.width,
      },
      height: {
        ideal: streamConfig.maxResolution.height,
        max: streamConfig.maxResolution.height,
      },
    },
  });
  if (window.broadcastClient) window.broadcastClient.addVideoInputDevice(window.videoStream, 'camera1', { index: 0 });
};

const createAudioStream = async () => {
  if (window.broadcastClient && window.broadcastClient.getAudioInputDevice('mic1')) window.broadcastClient.removeAudioInputDevice('mic1');
  window.audioStream = await navigator.mediaDevices.getUserMedia({
    audio: {
      deviceId: window.selectedAudioDeviceId
    },
  });
  if (window.broadcastClient) window.broadcastClient.addAudioInputDevice(window.audioStream, 'mic1');
};

const selectCamera = async (e) => {
  window.selectedVideoDeviceId = e.target.value;
  await createVideoStream();
};

const selectMic = async (e) => {
  window.selectedAudioDeviceId = e.target.value;
  await createAudioStream();
};

const previewVideo = () => {
  const previewEl = document.getElementById('broadcast-preview');
  window.broadcastClient.attachPreview(previewEl);
};

const toggleBroadcast = () => {
  if(!window.isBroadcasting) {
    startBroadcast();
  }
  else {
    stopBroadcast();
  }
};

const broadcastReady = () => {
  const key = document.getElementById('stream-key').value;
  const endpoint = document.getElementById('endpoint').value;
  
  if(!key && !endpoint) {
    alert('Please enter a Stream Key and Ingest Endpoint!');
    return false;
  }
  return true;
}

const startBroadcast = () => {
  const key = document.getElementById('stream-key').value;
  const endpoint = document.getElementById('endpoint').value;
  const streamBtn = document.getElementById('stream-btn');
  const onlineIndicator = document.getElementById('online-indicator');
  
  if(broadcastReady()) {
    window.broadcastClient
      .startBroadcast(key, endpoint)
      .then(() => {
        streamBtn.innerHTML = 'Stop';
        onlineIndicator.classList.remove('d-none');
        window.isBroadcasting = true;
      })
      .catch((error) => {
        streamBtn.innerHTML = 'Stream';
        onlineIndicator.classList.add('d-none');
        window.isBroadcasting = false;
        console.error(error);
      });  
  }
};

const stopBroadcast = () => {
  window.broadcastClient.stopBroadcast();
  window.isBroadcasting = false;
  document.getElementById('stream-btn').innerHTML = 'Stream';
  document.getElementById('online-indicator').classList.add('d-none');
};

const toggleScreenshare = async (e) => {
    const screenshareBtn = e.currentTarget;
    if(!broadcastReady()) return;
    if (!window.isSharingScreen) {
        await shareScreen();
        if (!window.isBroadcasting) startBroadcast();
        screenshareBtn.innerHTML = 'Stop Screen Share';
        screenshareBtn.classList.remove('btn-outline-primary');
        screenshareBtn.classList.add('btn-danger');
        window.isSharingScreen = true;
    }
    else {
        screenshareBtn.innerHTML = 'Share Screen';
        screenshareBtn.classList.add('btn-outline-primary');
        screenshareBtn.classList.remove('btn-danger');
        window.isSharingScreen = false;
        await createVideoStream();
    }
};

const shareScreen = async () => {
    if (window.broadcastClient && window.broadcastClient.getVideoInputDevice('camera1')) {
      window.broadcastClient.removeVideoInputDevice('camera1');
    }
    window.videoStream = await navigator.mediaDevices.getDisplayMedia();
    if (window.broadcastClient) {
      window.broadcastClient.addVideoInputDevice(window.videoStream, 'camera1', { index: 0 });
    }
};

const showOverlay = () => {
    const preview = document.getElementById('broadcast-preview');
    const overlay = document.createElement('canvas');
    overlay.width = preview.width;
    overlay.height = preview.height;
    overlay.style.display = 'none';
    let ctx = overlay.getContext('2d');
    ctx.fillStyle = 'black';
    ctx.globalAlpha = 0.5;
    ctx.fillRect(0, overlay.height - 220, overlay.width, 220);

    ctx.globalAlpha = 1;
    ctx.strokeStyle = 'black';
    ctx.lineWidth = 3;

    ctx.font = 'bold 120px Arial';
    ctx.fillStyle = 'white';
    ctx.fillText('Amazon IVS Web Broadcast', 30, overlay.height - 100);

    ctx.font = 'bold 40px Arial';
    ctx.fillStyle = 'white';
    ctx.fillText('Canvas Overlay Demo', 40, overlay.height - 40);

    document.querySelector('body').appendChild(overlay);

    window.broadcastClient.addImageSource(overlay, 'overlay1', { index: 1 });

    setTimeout(() => {
        window.broadcastClient.removeImage('overlay1');
        overlay.remove();
    }, 10000);
};

document.addEventListener('DOMContentLoaded', init);
!
999px

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