Sample code

analyzeStats.js

const MOSQuality = {
  Excellent: 5,
  Good: 4,
  Fair: 3,
  Poor: 2,
  Bad: 1,
};

const analyzeStats = (results, subscriber) => {
  if (subscriber && subscriber.stream && subscriber.stream.hasVideo) {
    const videoBw = results.video.bitsPerSecond / 1000;
    const videoPLRatio = results.video.packetLossRatioPerSecond;
    const frameRate = (subscriber.stream.frameRate && subscriber.stream.frameRate.toString()) || '30';
    const { width, height } = subscriber.stream.videoDimensions;
    const resolution = `${width}x${height}`;
    if (resolution === '1280x720') {
      const aVideoLimits = {
        '1280x720-30': [250, 350, 600, 1000],
        '1280x720-15': [150, 250, 350, 800],
        '1280x720-7': [120, 150, 250, 400],
      };
      if (videoBw > aVideoLimits[3] && videoPLRatio < 0.1) {
        return MOSQuality.Excellent;
      } else if (videoBw > aVideoLimits[2] && videoBw <= aVideoLimits[3] && videoPLRatio < 0.02) {
        return MOSQuality.Good;
      } else if (videoBw > aVideoLimits[2] && videoBw <= aVideoLimits[3] && videoPLRatio > 0.02 && videoPLRatio < 0.1) {
        return MOSQuality.Fair;
      } else if (videoBw > aVideoLimits[1] && videoBw <= aVideoLimits[2] && videoPLRatio < 0.1) {
        return MOSQuality.Fair;
      } else if (videoBw > aVideoLimits[0] && videoPLRatio > 0.1) {
        return MOSQuality.Poor;
      } else if (videoBw > aVideoLimits[0] && videoBw <= aVideoLimits[1] && videoPLRatio < 0.1) {
        return MOSQuality.Poor;
      } else if (videoBw < aVideoLimits[0] || videoPLRatio > 0.1) {
        return MOSQuality.Bad;
      }
      return MOSQuality.Bad;
    } else if (resolution === '640x480') {
      switch (frameRate) {
        case '30':
          if (videoBw > 600 && videoPLRatio < 0.1) {
            return MOSQuality.Excellent;
          } else if (videoBw > 250 && videoBw <= 600 && videoPLRatio < 0.02) {
            return MOSQuality.Good;
          } else if (videoBw > 250 && videoBw <= 600 && videoPLRatio > 0.02 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoBw > 150 && videoBw <= 250 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoPLRatio > 0.1 && videoBw > 150) {
            return MOSQuality.Poor;
          } else if (videoBw > 120 && videoBw <= 150 && videoPLRatio < 0.1) {
            return MOSQuality.Poor;
          } else if (videoBw < 120 || videoPLRatio > 0.1) {
            return MOSQuality.Bad;
          }
          return MOSQuality.Bad;
        case '15':
          if (videoBw > 400 && videoPLRatio < 0.1) {
            return MOSQuality.Excellent;
          } else if (videoBw > 200 && videoBw <= 400 && videoPLRatio < 0.02) {
            return MOSQuality.Good;
          } else if (videoBw > 150 && videoBw <= 200 && videoPLRatio > 0.02 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoBw > 120 && videoBw <= 150 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoPLRatio > 0.1 && videoBw > 120) {
            return MOSQuality.Poor;
          } else if (videoBw > 75 && videoBw <= 120 && videoPLRatio < 0.1) {
            return MOSQuality.Poor;
          } else if (videoBw < 75 || videoPLRatio > 0.1) {
            return MOSQuality.Bad;
          }
          return MOSQuality.Bad;
        case '7':
          if (videoBw > 200 && videoPLRatio < 0.1) {
            return MOSQuality.Excellent;
          } else if (videoBw > 150 && videoBw <= 200 && videoPLRatio < 0.02) {
            return MOSQuality.Good;
          } else if (videoBw > 120 && videoBw <= 150 && videoPLRatio > 0.02 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoBw > 75 && videoBw <= 120 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoPLRatio > 0.1 && videoBw > 50) {
            return MOSQuality.Poor;
          } else if (videoBw > 50 && videoBw <= 75 && videoPLRatio < 0.1) {
            return MOSQuality.Poor;
          } else if (videoBw < 50 || videoPLRatio > 0.1) {
            return MOSQuality.Bad;
          }
          return MOSQuality.Bad;
        default:
          return MOSQuality.Bad;
      }
    } else if (resolution === '320x240') {
      switch (frameRate) {
        case '30':
          if (videoBw > 300 && videoPLRatio < 0.1) {
            return MOSQuality.Excellent;
          } else if (videoBw > 200 && videoBw <= 300 && videoPLRatio < 0.02) {
            return MOSQuality.Good;
          } else if (videoBw > 120 && videoBw <= 200 && videoPLRatio > 0.02 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoBw > 120 && videoBw <= 200 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoPLRatio > 0.1 && videoBw > 120) {
            return MOSQuality.Poor;
          } else if (videoBw > 100 && videoBw <= 120 && videoPLRatio < 0.1) {
            return MOSQuality.Poor;
          } else if (videoBw < 100 || videoPLRatio > 0.1) {
            return MOSQuality.Bad;
          }
          return MOSQuality.Bad;
        case '15':
          if (videoBw > 200 && videoPLRatio < 0.1) {
            return MOSQuality.Excellent;
          } else if (videoBw > 150 && videoBw <= 200 && videoPLRatio < 0.02) {
            return MOSQuality.Good;
          } else if (videoBw > 120 && videoBw <= 150 && videoPLRatio > 0.02 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoBw > 120 && videoBw <= 150 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoPLRatio > 0.1 && videoBw > 120) {
            return MOSQuality.Poor;
          } else if (videoBw > 100 && videoBw <= 120 && videoPLRatio < 0.1) {
            return MOSQuality.Poor;
          } else if (videoBw < 100 || videoPLRatio > 0.1) {
            return MOSQuality.Bad;
          }
          return MOSQuality.Bad;
        case '7':
          if (videoBw > 150 && videoPLRatio < 0.1) {
            return MOSQuality.Excellent;
          } else if (videoBw > 100 && videoBw <= 150 && videoPLRatio < 0.02) {
            return MOSQuality.Good;
          } else if (videoBw > 100 && videoBw <= 150 && videoPLRatio > 0.02 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoBw > 75 && videoBw <= 100 && videoPLRatio < 0.1) {
            return MOSQuality.Fair;
          } else if (videoPLRatio > 0.1 && videoBw > 75) {
            return MOSQuality.Poor;
          } else if (videoBw > 50 && videoBw <= 75 && videoPLRatio < 0.1) {
            return MOSQuality.Poor;
          } else if (videoBw < 50 || videoPLRatio > 0.1) {
            return MOSQuality.Bad;
          }
          return MOSQuality.Bad;
        default:
          return MOSQuality.Bad;
      }
    }
    return MOSQuality.Bad;
  }
  const audioBw = results.audio.bitsPerSecond / 1000;
  const audioPLRadio = results.audio.packetLossRatioPerSecond;
  if (audioBw > 30 && audioPLRadio < 0.5) {
    return MOSQuality.Excellent;
  } else if (audioBw > 25 && audioPLRadio < 5) {
    return MOSQuality.Good;
  }
  return MOSQuality.Bad;
};