robbie-sdk/src/Session.js

Robbie Visio SDK to send events for analaysis

export const FRAME_RATE = 2000;
export default class Session {
  constructor(id, robbieSdk) {
    this._id = id;
    this._isOpened = true;
    this._intervalCallback = undefined;
    this._robbieSdk = robbieSdk;
    this._video = robbieSdk._video;
    this._canvas = robbieSdk._canvas;
    this._robbieApi = robbieSdk.robbieApi;
  }

  containsId() {
    return this._id != null && this._id !== '';
  }

  startRecording(onEmotionsReceived) {
    return new Promise((resolve, reject) => {
      if (!this.containsId() || !this.isOpened) {
        reject(new Error('Session does not contains an id'));
      }
      this._robbieSdk.validateCameraPermissions()
        .then((stream) => {
          this._video.src = window.URL.createObjectURL(stream);
        })
        .then(() => {
          this._intervalCallback = setInterval(() => {
            const frame = this._getVideoFrameString();
            this._robbieApi.requestEmotions(this._id, frame)
              .then((_response) => {
                resolve(_response);
                if (onEmotionsReceived != null) {
                  onEmotionsReceived(_response);
                }
              });
          }, FRAME_RATE);
          const frame = this._getVideoFrameString();
          return this._robbieApi.requestEmotions(this._id, frame)
            .then((response) => {
              resolve(response);
              if (onEmotionsReceived != null) {
                onEmotionsReceived(response);
              }
            });
        });
    });
  }

  get id() {
    return this._id;
  }

  get isOpened() {
    return this._isOpened;
  }

  close() {
    this._isOpened = false;
    clearInterval(this._intervalCallback);
  }

  _getVideoFrameString() {
    const width = this._canvas.width;
    const height = this._canvas.height;
    const ctx = this._canvas.getContext('2d');
    ctx.drawImage(this._video, 0, 0, width, height);
    const dataURL = this._canvas.toDataURL('image/jpeg', 0.90);
    return dataURL.replace(/^data:image\/jpeg;base64,/, '');
  }
}