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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 /**
      6  * @fileoverview
      7  * Module to support debug overlay window with connection stats.
      8  */
      9 
     10 'use strict';
     11 
     12 /** @suppress {duplicate} */
     13 var remoting = remoting || {};
     14 
     15 /**
     16  * @constructor
     17  * @param {Element} statsElement The HTML div to which to update stats.
     18  */
     19 remoting.ConnectionStats = function(statsElement) {
     20   this.statsElement = statsElement;
     21 };
     22 
     23 /**
     24  * Show or hide the connection stats div.
     25  */
     26 remoting.ConnectionStats.prototype.toggle = function() {
     27   this.statsElement.hidden = !this.statsElement.hidden;
     28 };
     29 
     30 /**
     31  * Update the statistics panel.
     32  * @param {remoting.ClientSession.PerfStats} stats The connection statistics.
     33  */
     34 remoting.ConnectionStats.prototype.update = function(stats) {
     35   var units = '';
     36   var videoBandwidth = stats.videoBandwidth;
     37   if (videoBandwidth != undefined) {
     38     if (videoBandwidth < 1024) {
     39       units = 'Bps';
     40     } else if (videoBandwidth < 1048576) {
     41       units = 'KiBps';
     42       videoBandwidth = videoBandwidth / 1024;
     43     } else if (videoBandwidth < 1073741824) {
     44       units = 'MiBps';
     45       videoBandwidth = videoBandwidth / 1048576;
     46     } else {
     47       units = 'GiBps';
     48       videoBandwidth = videoBandwidth / 1073741824;
     49     }
     50   }
     51 
     52   /**
     53    * @param {number} value
     54    * @param {string} units
     55    * @returns {string} Formatted number.
     56    */
     57   function formatStatNumber(value, units) {
     58     if (value != undefined) {
     59       return value.toFixed(2) + ' ' + units;
     60     } else {
     61       return "n/a";
     62     }
     63   }
     64 
     65   var statistics = document.getElementById('statistics');
     66   this.statsElement.innerText = (
     67       'Bandwidth: ' + formatStatNumber(videoBandwidth, units) +
     68       ', Frame Rate: ' + formatStatNumber(stats.videoFrameRate, 'fps') +
     69       ', Capture: ' + formatStatNumber(stats.captureLatency, 'ms') +
     70       ', Encode: ' + formatStatNumber(stats.encodeLatency, 'ms') +
     71       ', Decode: ' + formatStatNumber(stats.decodeLatency, 'ms') +
     72       ', Render: ' + formatStatNumber(stats.renderLatency, 'ms') +
     73       ', Latency: ' + formatStatNumber(stats.roundtripLatency, 'ms'));
     74 };
     75 
     76 /**
     77  * Check for the debug toggle hot-key.
     78  *
     79  * @param {Event} event The keyboard event.
     80  * @return {void} Nothing.
     81  */
     82 remoting.ConnectionStats.onKeydown = function(event) {
     83   var element = /** @type {Element} */ (event.target);
     84   if (element.tagName == 'INPUT' || element.tagName == 'TEXTAREA') {
     85     return;
     86   }
     87   if (String.fromCharCode(event.which) == 'D') {
     88     remoting.stats.toggle();
     89   }
     90 };
     91 
     92 /** @type {remoting.ConnectionStats} */
     93 remoting.stats = null;
     94