WISH_bitmovinPlayer/index_wish_bitmovin.html at main · cd-athena/WISH_bitmovinPlayer · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bitmovin SDK - Getting Started WEB SDK</title>
  <meta charset="UTF-8"/>
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
  <script type="text/javascript" src="https://cdn.bitmovin.com/player/web/8.43.0/bitmovinplayer.js"></script>
</head>
<body>

<!-- STEP 2 - Provide a player container element-->
<div id="my-player"></div>

<p> Select user preferences.</p>

<form >
  <label for="preferences">Select a mode:</label>
  <select name="preferences" id="preferences">
    <option value="save_data">Reduce Data Usage</option>
    <option value="balance" selected>Balanced</option>
    <option value="high_quality">Highest Quality</option>
  </select>
  <br><br>
  <label for="quality_function">Select a quality function:</label>
  <select name="quality_function" id="quality_function">
    <option value="linear"select>Linear</option>
    <option value="logarithm">Logarithm</option>
  </select>
  <br><br>
  <button type="button" onclick="getUserConfiguration()"> Submit</button>
</form>

<script>
var qualitySwitches = 0
const buffer_size = 40
var throughputHistory = [];


var currentQuality = null;
var sameRepCount = 0;
var MIN_BUFFER_RATIO = 0.2;
var alpha = 0;
var beta = 0;
var gamma = 0;
var denominator_exp = 0;

var smoothThroughputKbps = 0;
var num_downloaded_segments = 0;
var selected_quality_index_array = [];

var availableVideoQualities;
var last_selected_quality = 0;
var next_selected_quality = 0;
var bitratesKbps = [];
var SD = 4;
var currentBufferS;
var lastBufferS;
var downloadedData

var low_buff_thresS = 0;
var lastThroughputKbps = 0;
var qualityFunction = null;
var multiplier = 1;
var maxResolution = 0;
var videoThroughputKbps = 0;
var audioThroughputKbps = 0;


//<!-- STEP 3 - Configure and Initialize the player-->
var playerConfig = {
  "key": "",
  "playback": {
    "muted": true,
    "autoplay": true
  },
  style: {
        width: '640px',
        height: '480px'
  },
  tweaks: {
    file_protocol: true,
    app_id: 'ANY_STRING_ID',
    max_buffer_level: buffer_size
  },
  adaptation: {
    onVideoAdaptation: wishmmsp
  },
}

var container = document.getElementById('my-player');
var player = new bitmovin.player.Player(container, playerConfig);

var sourceConfig = {
    // dash: "http://127.0.0.1:81/tos_h264_4s/manifest.mpd",
    dash: "https://dash.akamaized.net/akamai/bbb_30fps/bbb_30fps.mpd"
}

function getUserConfiguration() {
  let preference = document.getElementById('preferences')

  switch(preference.value) {
    case "save_data":
      m_xi = 1;
      m_delta = 1;
      maxResolution = 720;
      break;
    case "balance":
      m_xi = 0.75;
      m_delta = 0.75;
      maxResolution = 1080;
      break;
    case "high_quality":
      m_xi = 0.5;
      m_delta = 0.5;
      maxResolution = 2160;
      break;
  }


  player.load(sourceConfig).then(function() {
    console.log('Successfully loaded Source Config!');
    }).catch(function(reason) {
      console.log('Error while loading source:', reason);
    }
  );
}

///////////////////////////////////////////////////////////////////////


function wishmmsp() {
  availableVideoQualities = player.getAvailableVideoQualities()
  next_selected_quality = 0;
  availableVideoQualities.sort(function (a, b) {
    return a.bitrate - b.bitrate;
  });

  bitratesKbps = []
    for (var i = 0; i < availableVideoQualities.length; i++) {
      if (availableVideoQualities[i].height <= maxResolution)
        bitratesKbps.push(availableVideoQualities[i].bitrate/1000);
    }

  currentBufferS = player.getVideoBufferLength();

  if (!player) {
      return;
  }

  if (player.getConfig().hasOwnProperty('tweaks') && player.getConfig().tweaks.hasOwnProperty('max_buffer_level')) {
      maxBufferLevel = player.getConfig().tweaks.max_buffer_level;
  } else {
      maxBufferLevel = 20;
  }

  var init = function () {
      player.on(bitmovin.player.PlayerEvent.DownloadFinished, onDownloadFinished);
      player.on(bitmovin.player.PlayerEvent.SegmentPlayback, function(data) {
        SD = data.duration
      })
  };

  if (player.getSource()) {
      init();
  } else {
      player.on(bitmovin.player.PlayerEvent.SourceLoaded, init);
  }

  var nextQuality = onVideoAdaptation();
  return nextQuality.id;
}

function resetBuffer() {
  console.log(" resetBuffer ")
  throughputHistory = [];
}

function onDownloadFinished(event) {
  const instantThroughputKbps = (event.size > 2000) ? (event.size * 8/1000) / event.downloadTime : lastThroughputKbps;
  if (event.downloadType === 'media/video') {
    videoThroughputKbps = instantThroughputKbps;
    lastThroughputKbps = Math.max(videoThroughputKbps, audioThroughputKbps)
  } else {
    audioThroughputKbps = instantThroughputKbps;
    lastThroughputKbps = Math.max(videoThroughputKbps, audioThroughputKbps)
  }
}

function getSmoothThroughput(margin, lastThroughputKbps, smoothThroughputKbps) {
  if (lastThroughputKbps > 0) {
      if (smoothThroughputKbps === 0) {
          smoothThroughputKbps = lastThroughputKbps;
      }
      else {
          smoothThroughputKbps = (1 - margin) * smoothThroughputKbps + margin * lastThroughputKbps;
      }
  }
  else {
      smoothThroughputKbps = 5000;    // finetune
  }

  return smoothThroughputKbps;
}

function getQualityFunction(bitrates, functionType) {
  let qualityLevelList = [];
  let length = bitrates.length;

  if (functionType === "linear"){
    for (let i = 0; i < length; i ++) {
      qualityLevelList.push(1.0*bitrates[i]/bitrates[length-1]);

    }
  } else {
    for (let i = 0; i < length; i ++) {
      qualityLevelList.push(Math.log(bitrates[i]/bitrates[0]));

    }
  }
  return qualityLevelList;
}

function setWeightsLinear(m_xi, m_delta, qualityLevelList, segment_duration) {
  let num_considered_bitrate=bitratesKbps.length
  let R_max_Mbps = bitratesKbps[num_considered_bitrate-1];
  let R_o_Mbps = bitratesKbps[num_considered_bitrate-1];
  let thrp_optimal = bitratesKbps[num_considered_bitrate-1];
  let last_quality_1_Mbps = bitratesKbps[num_considered_bitrate-2];
  let optimal_delta_buffer_S = buffer_size*(m_xi - MIN_BUFFER_RATIO);

  let temp_beta_alpha = optimal_delta_buffer_S/segment_duration;
  let temp_a = 2.0*Math.exp(1+ last_quality_1_Mbps/R_max_Mbps-2.0*R_o_Mbps/R_max_Mbps);
  let temp_b = (1 + temp_beta_alpha*SD/(optimal_delta_buffer_S))/thrp_optimal;

  denominator_exp = Math.exp(2*qualityLevelList[num_considered_bitrate-1]-2*qualityLevelList[0]);
  alpha = 1.0/(1 + temp_beta_alpha + R_max_Mbps*temp_b*denominator_exp/temp_a);
  beta = temp_beta_alpha*alpha;
  gamma = 1 - alpha - beta;
}

function setWeightsLogarit(m_xi, m_delta, qualityLevelList, segment_duration,) {
  let num_considered_bitrate=bitratesKbps.length
  let R_i = bitratesKbps[num_considered_bitrate-1];
  let R_min = bitratesKbps[0];
  let Q_k = bitratesKbps[num_considered_bitrate-2];
  let delta_B = m_xi*buffer_size - low_buff_thresS;
  denominator_exp = Math.exp(2*qualityLevelList[num_considered_bitrate-1]-2*qualityLevelList[0]);

  alpha = 1 / (1 +
                delta_B/segment_duration +
                Math.pow(R_i,3)/(m_delta*Math.pow(R_min,2)*Q_k));
  beta = alpha*delta_B/segment_duration;
  gamma = 1 - alpha - beta;
}

function getTotalCost_v3(bitrates, qualityIndex,
  estimated_throghputKbps, currentbufferS) {
    let totalCost;
    let bandwidthCost;
    let bufferCost;
    let qualityCost;
    let current_quality_level = qualityLevelList[qualityIndex];

    let temp = bitrates[qualityIndex]*1.0/estimated_throghputKbps;  // bitrate is in bps
    let average_quality = 0;
    let slice_window = 10;
    let length_quality = qualityLevelList.length;
    let num_downloaded_segments = selected_quality_index_array.length;
    let quality_window = Math.min(slice_window, num_downloaded_segments);

    for (let i = 1; i <= quality_window; i++){
        let m_qualityIndex = getQualityIndexFromBitrate(selected_quality_index_array[num_downloaded_segments-i], length_quality);
        average_quality += qualityLevelList[m_qualityIndex];
    }

    average_quality = average_quality/quality_window;

    bandwidthCost = temp;

    bufferCost = temp*(SD/(currentbufferS - low_buff_thresS));
    qualityCost = Math.exp(qualityLevelList[length_quality-1] + average_quality - 2*current_quality_level)/denominator_exp;
    totalCost = alpha*bandwidthCost + beta*bufferCost + gamma*qualityCost;

    return totalCost;
}

function onVideoAdaptation() {
  const length = bitratesKbps.length;

  low_buff_thresS = SD;
  if (downloadedData == null || currentBufferS < SD){
    downloadedData = availableVideoQualities[0]
    return downloadedData;
  }
  selected_quality_index_array.push(downloadedData.bitrate/1000)
  num_downloaded_segments = selected_quality_index_array.length

  let lowest_cost = Number.MAX_SAFE_INTEGER;
  let max_quality = 0;

  smoothThroughputKbps = getSmoothThroughput(0.125, lastThroughputKbps, smoothThroughputKbps);
  var estimated_throghputKbps = Math.min(smoothThroughputKbps, lastThroughputKbps);

  qualityLevelList = getQualityFunction(bitratesKbps, document.getElementById('quality_function').value);

  for (let i = length-1; i >= 0; i--){
    if (bitratesKbps[i] < lastThroughputKbps * (1+0.1)) { // MMSP
      // if (bitratesKbps[i] < smoothThroughputKbps * (1+0.1)) {
      max_quality = i;
      break;
    }
  }

  if (max_quality === 0) {
    next_selected_quality = max_quality;
  }

  if (document.getElementById("quality_function").value == "linear") {
    multiplier = 100;
    setWeightsLinear(m_xi, m_delta, qualityLevelList, SD);
  } else {
    multiplier = 10000;
    setWeightsLogarit(m_xi, m_delta, qualityLevelList, SD);
  }


  for (let i = 1; i <= max_quality; i++) {
    let currentTotalCost = Math.round(multiplier*getTotalCost_v3(bitratesKbps, i, estimated_throghputKbps, currentBufferS));
    if (currentTotalCost <= lowest_cost) {
      next_selected_quality = i;
      lowest_cost = currentTotalCost;
    }
  }

  // check if it's suitable to decrease the quality
  const threshold_ = 0.2
  if (lastBufferS - currentBufferS < lastBufferS*threshold_ && next_selected_quality < last_selected_quality) {
    next_selected_quality = last_selected_quality;
  }

  last_selected_quality = next_selected_quality;
  var finalDecision = availableVideoQualities[next_selected_quality]

  downloadedData = finalDecision;
  lastBufferS = currentBufferS;

  return finalDecision

}

function getQualityIndexFromBitrate(bitrate, bitrates_length) {
  for (let i = 0; i < bitrates_length; i ++) {
    if (bitrate == bitratesKbps[i]) {
      return i;
    }
  }
  return 0;

}

</script>
</body>
</html>