Overview

Two Way Streaming in Typescript application shows how to use Web SDK in React application written in Typescript to publish and play WebRTC stream

The project is available on GitHub, and in Web SDK build archives since build 2.0.203 by the following path examples/typescript/two-way-streaming-ts.

Building the project

1. Download WebSDK source code

git clone https://github.com/flashphoner/flashphoner_client.git

2. Go to the example folder

cd flashphoner_client/examples/typescript/two-way-streaming-ts

3. Install dependencies

npm install

4. Build for local testing

npm start

or to deploy to your web server

npm run build

Analyzing example code

To analyze the code take version with hash d9abaca which is available here and in Web SDK build 2.0.203

Application code is in TwoWayStreamingApp.tsx file, additional functions are in fp-utils.ts file

1. API import

code

import * as FPUtils from './fp-utils';
import * as Flashphoner from '@flashphoner/websdk';

2. API initialization

Flashphoner.init() code

  componentDidMount() {
    try {
      Flashphoner.init({});
      ...
    }
    catch(e) {
      console.log(e);
      ...
    }
  }

3. Connecting to the server and receving the event confirming connection is established successfully

Flashphoner.createSession(), SESSION_STATUS.ESTABLISHED code

  onConnectClick = () => {
    let app = this;
    let url = this.state.serverUrl;
    let session = this.state.session;

    if (!session) {
      console.log("Create new session with url " + url);
      app.setState({connectButtonDisabled: true, serverUrlDisabled: true});
      Flashphoner.createSession({urlServer: url}).on(SESSION_STATUS.ESTABLISHED, (session) => {
        app.setState({sessionStatus: SESSION_STATUS.ESTABLISHED, sessionStatusClass: 'text-success'});
        app.onConnected(session);
      }).on(SESSION_STATUS.DISCONNECTED, () => {
        ...
      }).on(SESSION_STATUS.FAILED, () => {
        ...
      });
    }
    ...
  }

4. Stream publishing

Session.createStream(), Stream.publish() code

  publishStream = () => {
    let app = this;
    let session = this.state.session;
    let streamName = this.state.publishStreamName;
    let localVideo = this.state.localVideo;

    if(session && localVideo) {
      session.createStream({
        name: streamName,
        display: localVideo,
        cacheLocalResources: true,
        receiveVideo: false,
        receiveAudio: false
      }).on(STREAM_STATUS.PUBLISHING, (stream) => {
        ...
      }).on(STREAM_STATUS.UNPUBLISHED, () => {
        ...
      }).on(STREAM_STATUS.FAILED, () => {
        ...
      }).publish();
    }
  }

5. Receiving the event confirming the stream is successfully published

STREAM_STATUS.PUBLISHING code

  publishStream = () => {
    let app = this;
    let session = this.state.session;
    let streamName = this.state.publishStreamName;
    let localVideo = this.state.localVideo;

    if(session && localVideo) {
      session.createStream({
        ...
      }).on(STREAM_STATUS.PUBLISHING, (stream) => {
        app.setState({publishStatus: STREAM_STATUS.PUBLISHING, publishStatusClass: 'text-success'});
        app.onPublishing(stream);
      }).on(STREAM_STATUS.UNPUBLISHED, () => {
        ...
      }).on(STREAM_STATUS.FAILED, () => {
        ...
      }).publish();
    }
  }

6. Stream playback with picture resizing to div size

Session.createStream(), Stream.play(), STREAM_STATUS.PENDING, FPUtils.resizeVideo() code

  playStream = () => {
    let app = this;
    let session = this.state.session;
    let streamName = this.state.playStreamName;
    let remoteVideo = this.state.remoteVideo;

    if(session && remoteVideo) {
      session.createStream({
        name: streamName,
        display: remoteVideo
      }).on(STREAM_STATUS.PENDING, (stream) => {
        let video = document.getElementById(stream.id());
        if (!video.hasListeners) {
            video.hasListeners = true;
            video.addEventListener('resize', (event) => {
                FPUtils.resizeVideo(event.target);
            });
        }
      }).on(STREAM_STATUS.PLAYING, (stream) => {
        ...
      }).on(STREAM_STATUS.STOPPED, () => {
        ...
      }).on(STREAM_STATUS.FAILED, () => {
        ...
      }).play();
    }
  }

7. Receiving the event confirming successful playback

STREAM_STATUS.PLAYING code

  playStream = () => {
    let app = this;
    let session = this.state.session;
    let streamName = this.state.playStreamName;
    let remoteVideo = this.state.remoteVideo;

    if(session && remoteVideo) {
      session.createStream({
        name: streamName,
        display: remoteVideo
      }).on(STREAM_STATUS.PENDING, (stream) => {
        ...
      }).on(STREAM_STATUS.PLAYING, (stream) => {
        app.setState({playStatus: STREAM_STATUS.PLAYING, playStatusClass: 'text-success'});
        app.onPlaying(stream);
      }).on(STREAM_STATUS.STOPPED, () => {
        ...
      }).on(STREAM_STATUS.FAILED, () => {
        ...
      }).play();
    }
  }

8. Playback stopping

Stream.stop() code

  onPlayClick = () => {
    let app = this;
    let stream = this.state.playStream;
    ...

    if (!stream) {
      ...
      app.playStream();
    } else {
      app.setState({playButtonDisabled: true});
      stream.stop();
    }
  }

9. Receiving the event confirming playback is stopped

STREAM_STATUS.STOPPED code

  playStream = () => {
    let app = this;
    let session = this.state.session;
    let streamName = this.state.playStreamName;
    let remoteVideo = this.state.remoteVideo;

    if(session && remoteVideo) {
      session.createStream({
        name: streamName,
        display: remoteVideo
      }).on(STREAM_STATUS.PENDING, (stream) => {
        ...
      }).on(STREAM_STATUS.PLAYING, (stream) => {
        ...
      }).on(STREAM_STATUS.STOPPED, () => {
        app.setState({playStatus: STREAM_STATUS.STOPPED, playStatusClass: 'text-success'});
        app.onStopped();
      }).on(STREAM_STATUS.FAILED, () => {
        ...
      }).play();
    }
  }

10. Publishing stopping

Stream.stop() code

  onPublishClick = () => {
    let app = this;
    let stream = this.state.publishStream;
    ...
    if (!stream) {
      ...
      app.publishStream();
    } else {
      app.setState({publishButtonDisabled: true});
      stream.stop();
    }
  }

11. Receiving the event confirming the stream is unpublished

STREAM_STATUS.UNPUBLISHED code

  publishStream = () => {
    let app = this;
    let session = this.state.session;
    let streamName = this.state.publishStreamName;
    let localVideo = this.state.localVideo;

    if(session && localVideo) {
      session.createStream({
        ...
      }).on(STREAM_STATUS.PUBLISHING, (stream) => {
        ...
      }).on(STREAM_STATUS.UNPUBLISHED, () => {
        app.setState({publishStatus: STREAM_STATUS.UNPUBLISHED, publishStatusClass: 'text-success'});
        app.onUnpublished();
      }).on(STREAM_STATUS.FAILED, () => {
        ...
      }).publish();
    }
  }

12. Connection closing

Session.disconnect() code

  onConnectClick = () => {
    let app = this;
    let url = this.state.serverUrl;
    let session = this.state.session;

    if (!session) {
      ...
    } else {
      app.setState({connectButtonDisabled: true});
      session.disconnect();
    }
  }

13. Receiving the event confirming the connection is closed

SESSION_STATUS.DISCONNECTED code

  onConnectClick = () => {
    let app = this;
    let url = this.state.serverUrl;
    let session = this.state.session;

    if (!session) {
      ...
      Flashphoner.createSession({urlServer: url}).on(SESSION_STATUS.ESTABLISHED, (session) => {
        ...
      }).on(SESSION_STATUS.DISCONNECTED, () => {
        app.setState({sessionStatus: SESSION_STATUS.DISCONNECTED, sessionStatusClass: 'text-success'});
        app.onDisconnected();
      }).on(SESSION_STATUS.FAILED, () => {
        ...
      });
      ...
    }
  }

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Overview

Building the project

Analyzing example code