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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file contains helper methods to draw the stats timeline graphs.
// Each graph represents a series of stats report for a PeerConnection,
// e.g. 1234-0-ssrc-abcd123-bytesSent is the graph for the series of bytesSent
// for ssrc-abcd123 of PeerConnection 0 in process 1234.
// The graphs are drawn as CANVAS, grouped per report type per PeerConnection.
// Each group has an expand/collapse button and is collapsed initially.
//
<include src="data_series.js"/>
<include src="timeline_graph_view.js"/>
var STATS_GRAPH_CONTAINER_HEADING_CLASS = 'stats-graph-container-heading';
// Specifies which stats should be drawn on the 'bweCompound' graph and how.
var bweCompoundGraphConfig = {
googAvailableSendBandwidth: {color: 'red'},
googTargetEncBitrateCorrected: {color: 'purple'},
googActualEncBitrate: {color: 'orange'},
googRetransmitBitrate: {color: 'blue'},
googTransmitBitrate: {color: 'green'},
};
// Converts the last entry of |srcDataSeries| from the total amount to the
// amount per second.
var totalToPerSecond = function(srcDataSeries) {
var length = srcDataSeries.dataPoints_.length;
if (length >= 2) {
var lastDataPoint = srcDataSeries.dataPoints_[length - 1];
var secondLastDataPoint = srcDataSeries.dataPoints_[length - 2];
return (lastDataPoint.value - secondLastDataPoint.value) * 1000 /
(lastDataPoint.time - secondLastDataPoint.time);
}
return 0;
};
// Converts the value of total bytes to bits per second.
var totalBytesToBitsPerSecond = function(srcDataSeries) {
return totalToPerSecond(srcDataSeries) * 8;
};
// Specifies which stats should be converted before drawn and how.
// |convertedName| is the name of the converted value, |convertFunction|
// is the function used to calculate the new converted value based on the
// original dataSeries.
var dataConversionConfig = {
packetsSent: {
convertedName: 'packetsSentPerSecond',
convertFunction: totalToPerSecond,
},
bytesSent: {
convertedName: 'bitsSentPerSecond',
convertFunction: totalBytesToBitsPerSecond,
},
packetsReceived: {
convertedName: 'packetsReceivedPerSecond',
convertFunction: totalToPerSecond,
},
bytesReceived: {
convertedName: 'bitsReceivedPerSecond',
convertFunction: totalBytesToBitsPerSecond,
},
// This is due to a bug of wrong units reported for googTargetEncBitrate.
// TODO (jiayl): remove this when the unit bug is fixed.
googTargetEncBitrate: {
convertedName: 'googTargetEncBitrateCorrected',
convertFunction: function (srcDataSeries) {
var length = srcDataSeries.dataPoints_.length;
var lastDataPoint = srcDataSeries.dataPoints_[length - 1];
if (lastDataPoint.value < 5000)
return lastDataPoint.value * 1000;
return lastDataPoint.value;
}
}
};
var graphViews = {};
var dataSeries = {};
// Adds the stats report |singleReport| to the timeline graph for the given
// |peerConnectionElement| and |reportName|.
function drawSingleReport(
peerConnectionElement, reportType, reportId, singleReport) {
if (!singleReport || !singleReport.values)
return;
var reportName = reportType + '-' + reportId;
for (var i = 0; i < singleReport.values.length - 1; i = i + 2) {
var rawLabel = singleReport.values[i];
var rawValue = parseInt(singleReport.values[i + 1]);
if (isNaN(rawValue))
return;
var rawDataSeriesId =
peerConnectionElement.id + '-' + reportName + '-' + rawLabel;
var finalDataSeriesId = rawDataSeriesId;
var finalLabel = rawLabel;
var finalValue = rawValue;
// We need to convert the value if dataConversionConfig[rawLabel] exists.
if (dataConversionConfig[rawLabel]) {
// Updates the original dataSeries before the conversion.
addDataSeriesPoint(rawDataSeriesId, singleReport.timestamp,
rawLabel, rawValue);
// Convert to another value to draw on graph, using the original
// dataSeries as input.
finalValue = dataConversionConfig[rawLabel].convertFunction(
dataSeries[rawDataSeriesId]);
finalLabel = dataConversionConfig[rawLabel].convertedName;
finalDataSeriesId =
peerConnectionElement.id + '-' + reportName + '-' + finalLabel;
}
// Updates the final dataSeries to draw.
addDataSeriesPoint(
finalDataSeriesId, singleReport.timestamp, finalLabel, finalValue);
// Updates the graph.
var graphType = bweCompoundGraphConfig[finalLabel] ?
'bweCompound' : finalLabel;
var graphViewId =
peerConnectionElement.id + '-' + reportName + '-' + graphType;
if (!graphViews[graphViewId]) {
graphViews[graphViewId] = createStatsGraphView(peerConnectionElement,
reportType, reportId,
graphType);
var date = new Date(singleReport.timestamp);
graphViews[graphViewId].setDateRange(date, date);
}
// Adds the new dataSeries to the graphView. We have to do it here to cover
// both the simple and compound graph cases.
if (!graphViews[graphViewId].hasDataSeries(dataSeries[finalDataSeriesId]))
graphViews[graphViewId].addDataSeries(dataSeries[finalDataSeriesId]);
graphViews[graphViewId].updateEndDate();
}
}
// Makes sure the TimelineDataSeries with id |dataSeriesId| is created,
// and adds the new data point to it.
function addDataSeriesPoint(dataSeriesId, time, label, value) {
if (!dataSeries[dataSeriesId]) {
dataSeries[dataSeriesId] = new TimelineDataSeries();
if (bweCompoundGraphConfig[label]) {
dataSeries[dataSeriesId].setColor(
bweCompoundGraphConfig[label].color);
}
}
dataSeries[dataSeriesId].addPoint(time, value);
}
// Ensures a div container to hold all stats graphs for one track is created as
// a child of |peerConnectionElement|.
function ensureStatsGraphTopContainer(
peerConnectionElement, reportType, reportId) {
var containerId = peerConnectionElement.id + '-' +
reportType + '-' + reportId + '-graph-container';
var container = $(containerId);
if (!container) {
container = document.createElement('details');
container.id = containerId;
container.className = 'stats-graph-container';
peerConnectionElement.appendChild(container);
container.innerHTML ='<summary><span></span></summary>';
container.firstChild.firstChild.className =
STATS_GRAPH_CONTAINER_HEADING_CLASS;
container.firstChild.firstChild.textContent =
'Stats graphs for ' + reportType + '-' + reportId;
if (reportType == 'ssrc') {
var ssrcInfoElement = document.createElement('div');
container.firstChild.appendChild(ssrcInfoElement);
ssrcInfoManager.populateSsrcInfo(ssrcInfoElement, reportId);
}
}
return container;
}
// Creates the container elements holding a timeline graph
// and the TimelineGraphView object.
function createStatsGraphView(
peerConnectionElement, reportType, reportId, statsName) {
var topContainer = ensureStatsGraphTopContainer(peerConnectionElement,
reportType, reportId);
var graphViewId = peerConnectionElement.id + '-' +
reportType + '-' + reportId + '-' + statsName;
var divId = graphViewId + '-div';
var canvasId = graphViewId + '-canvas';
var container = document.createElement("div");
container.className = 'stats-graph-sub-container';
topContainer.appendChild(container);
container.innerHTML = '<div>' + statsName + '</div>' +
'<div id=' + divId + '><canvas id=' + canvasId + '></canvas></div>';
if (statsName == 'bweCompound') {
container.insertBefore(
createBweCompoundLegend(
peerConnectionElement, reportType + '-' + reportId),
$(divId));
}
return new TimelineGraphView(divId, canvasId);
}
// Creates the legend section for the bweCompound graph.
// Returns the legend element.
function createBweCompoundLegend(peerConnectionElement, reportName) {
var legend = document.createElement('div');
for (var prop in bweCompoundGraphConfig) {
var div = document.createElement('div');
legend.appendChild(div);
div.innerHTML = '<input type=checkbox checked></input>' + prop;
div.style.color = bweCompoundGraphConfig[prop].color;
div.dataSeriesId = peerConnectionElement.id + '-' + reportName + '-' + prop;
div.graphViewId =
peerConnectionElement.id + '-' + reportName + '-bweCompound';
div.firstChild.addEventListener('click', function(event) {
var target = dataSeries[event.target.parentNode.dataSeriesId];
target.show(event.target.checked);
graphViews[event.target.parentNode.graphViewId].repaint();
});
}
return legend;
}
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