Move webrtc/{tools => rtc_tools}

webrtc/tools/loopback_test/stat_tracker.js

-/**
- * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
- *
- * Use of this source code is governed by a BSD-style license
- * that can be found in the LICENSE file in the root of the source
- * tree. An additional intellectual property rights grant can be found
- * in the file PATENTS.  All contributing project authors may
- * be found in the AUTHORS file in the root of the source tree.
- */
-
-// StatTracker is a helper class to keep track of stats on a RTCPeerConnection
-// object. It uses google visualization datatables to keep the recorded samples
-// and simplify plugging them into graphs later.
-//
-// Usage example:
-//   var tracker = new StatTracker(pc, pollInterval);
-//   tracker.recordStat("EstimatedSendBitrate",
-//                      "bweforvideo", "googAvailableSendBandwidth");
-//   ...
-//   tracker.stop();
-//   tracker.dataTable(); // returns the recorded values. In this case
-//   a table with 2 columns { Time, EstimatedSendBitrate } and a row for each
-//   sample taken until stop() was called.
-//
-function StatTracker(pc, pollInterval) {
-  pollInterval = pollInterval || 250;
-
-  var dataTable = new google.visualization.DataTable();
-  var timeColumnIndex = dataTable.addColumn('datetime', 'Time');
-  var recording = true;
-
-  // Set of sampling functions. Functions registered here are called
-  // once per getStats with the given report and a rowIndex for the
-  // sample period so they can extract and record the tracked variables.
-  var samplingFunctions = {};
-
-  // Accessor to the current recorded stats.
-  this.dataTable = function() { return dataTable; }
-
-  // recordStat(varName, recordName, statName) adds a samplingFunction that
-  // records namedItem(recordName).stat(statName) from RTCStatsReport for each
-  // sample into a column named varName in the dataTable.
-  this.recordStat = function (varName, recordName, statName) {
-    var columnIndex = dataTable.addColumn('number', varName);
-    samplingFunctions[varName] = function (report, rowIndex) {
-      var sample;
-      var record = report.namedItem(recordName);
-      if (record) sample = record.stat(statName);
-      dataTable.setCell(rowIndex, columnIndex, sample);
-    }
-  }
-
-  // Stops the polling of stats from the peer connection.
-  this.stop = function() {
-    recording = false;
-  }
-
-  // RTCPeerConnection.getStats is asynchronous. In order to avoid having
-  // too many pending getStats requests going, this code only queues the
-  // next getStats with setTimeout after the previous one returns, instead
-  // of using setInterval.
-  function poll() {
-    pc.getStats(function (report) {
-      if (!recording) return;
-      setTimeout(poll, pollInterval);
-      var result = report.result();
-      if (result.length < 1) return;
-
-      var rowIndex = dataTable.addRow();
-      dataTable.setCell(rowIndex, timeColumnIndex, result[0].timestamp);
-      for (var v in samplingFunctions)
-        samplingFunctions[v](report, rowIndex);
-    });
-  }
-  setTimeout(poll, pollInterval);
-}
-
-/**
- * Utility method to perform a full join between data tables from StatTracker.
- */
-function mergeDataTable(dataTable1, dataTable2) {
-  function allColumns(cols) {
-    var a = [];
-    for (var i = 1; i < cols; ++i) a.push(i);
-    return a;
-  }
-  return google.visualization.data.join(
-      dataTable1,
-      dataTable2,
-      'full',
-      [[0, 0]],
-      allColumns(dataTable1.getNumberOfColumns()),
-      allColumns(dataTable2.getNumberOfColumns()));
-}