Interactive Livestream (HLS) - Javascript

Interactive live streaming (HLS) refers to a type of live streaming where viewers can actively engage with the content being streamed and with other viewers in real-time.

In an interactive live stream (HLS), viewers can participate in various activities, such as live polling, Q&A sessions, and even sending virtual gifts to the content creator or each other.

VideoSDK enables you to configure the interactive livestream layout in various ways, either by setting different prebuilt layouts in the configuration or by providing your own custom template for livestreaming according to your layout choice.

This guide provides an overview of how to implement starting and stopping Interactive Live Streaming (HLS).

important

To initiate automatic Interactive live streaming (HLS) at the beginning of a session, simply provide the autoStartConfig feature hls during room creation. For more information on configuring the autoStartConfig, please refer to the provided documentation here.

startHls()

The startHls() method, accesible from the meeting object, is used to initiate interactive livestream of a meeting. This method accepts the following parameter:

• config (optional): This parameter defines how the interactive livestream layout should look like.

• transcription (optional): This parameter lets you start post transcription for the HLS.

  const config = {
    // Layout Configuration
    layout: {
      type: "GRID", // "SPOTLIGHT" | "SIDEBAR",  Default : "GRID"
      priority: "SPEAKER", // "PIN", Default : "SPEAKER"
      gridSize: 4, // MAX : 25
    },
  
    // Theme of livestream
    theme: "DARK", //  "LIGHT" | "DEFAULT"
  
    // `mode` is used to either interactive livestream video & audio both or only audio.
    mode: "video-and-audio", // "audio", Default : "video-and-audio"
  
    // Quality of livestream and is only applicable to `video-and-audio` type mode.
    quality: "high", // "low" | "med",  Default : "med"
  
    // This mode refers to orientation of recording.
    // landscape : Livestream the meeting in horizontally
    // portrait : Livestream the meeting in vertically (Best for mobile view)
    orientation: "landscape", // "portrait",  Default : "landscape"
  
    // Recording Configuration
    recording = {
      enabled: true, // Enables recording of HLS
    };
  };
  
  // Post Transcription Configuration
  const transcription = {
    enabled: true, // Enables post transcription
    summary: {
      enabled: true, // Enables summary generation
      // Guides summary generation
      prompt:
        "Write summary in sections like Title, Agenda, Speakers, Action Items, Outlines, Notes and Summary",
    },
  };
  
  startHls(config, transcription);

stopHls()

• The stopHls() method, accessible from the meeting object, is used to stop the interactive livestream of a meeting.

Example

let meeting;

// Initialize Meeting
meeting = VideoSDK.initMeeting({
  // ...
});

const startHlsBtn = document.getElementById("startHlsBtn");
startHlsBtn.addEventListener("click", () => {
  const config = {
    layout: {
      type: "GRID",
      priority: "SPEAKER",
      gridSize: 4,
    },
    theme: "DARK",
    mode: "video-and-audio",
    quality: "high",
    orientation: "landscape",
    recording = {
      enabled: true,
    };
  };

  // Configuration for post transcription
  const transcription = {
    enabled: true,
    summary: {
      enabled: true,
      prompt:
        "Write summary in sections like Title, Agenda, Speakers, Action Items, Outlines, Notes and Summary",
    },
  };

  // Start HLS
  meeting?.startHls(config, transcription);
});

const stopHlsBtn = document.getElementById("stopHlsBtn");
stopHlsBtn.addEventListener("click", () => {
  // Stop HLS
  meeting?.stopHls();
});

Event associated with HLS

• hls-state-changed - The hls-state-changed event is triggered whenever the state of meeting HLS changes.

• You can get the playbaclHlsUrl and livestreamUrl of the HLS to play it on the Viewer side when the state changes to Constants.hlsEvents.HLS_STARTED

• when you receive HLS_PLAYABLE status you will receive 2 urls in response

  • playbackHlsUrl - Live HLS with playback support
  • livestreamUrl - Live HLS without playback support

note

downstreamUrl is now depecated. Use playbackHlsUrl or livestreamUrl in place of downstreamUrl

let meeting;

// Initialize Meeting
meeting = VideoSDK.initMeeting({
  // ...
});

const Constants = VideoSDK.Constants;

meeting.on("hls-state-changed", (data) => {
  const { status } = data;

  if (status === Constants.hlsEvents.HLS_STARTING) {
    console.log("Meeting Hls is starting");
  } else if (status === Constants.hlsEvents.HLS_STARTED) {
    // when hls is started you will receive playbaclHlsUrl and livestreamUrl.
    const { playbackHlsUrl } = data;

    console.log("Meeting Hls is started");
  } else if (status === Constants.hlsEvents.HLS_STOPPING) {
    console.log("Meeting Hls is stopping");
  } else if (status === Constants.hlsEvents.HLS_STOPPED) {
    console.log("Meeting Hls is stopped");
  } else {
    //
  }
});

important

You can access your post transcriptions using our Post Transcription API

API Reference

The API references for all the methods utilized in this guide are provided below.

• startHls()
• stopHls()
• hls-state-changed
• autoStartConfig