1 // Copyright (c) 2013 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.
8 * Get the ssrc if |report| is an ssrc report.
10 * @param {!Object} report The object contains id, type, and stats, where stats
11 * is the object containing timestamp and values, which is an array of
12 * strings, whose even index entry is the name of the stat, and the odd
13 * index entry is the value.
14 * @return {?string} The ssrc.
16 function GetSsrcFromReport(report) {
17 if (report.type != 'ssrc') {
18 console.warn("Trying to get ssrc from non-ssrc report.");
22 // If the 'ssrc' name-value pair exists, return the value; otherwise, return
24 // The 'ssrc' name-value pair only exists in an upcoming Libjingle change. Old
25 // versions use id to refer to the ssrc.
27 // TODO(jiayl): remove the fallback to id once the Libjingle change is rolled
29 if (report.stats && report.stats.values) {
30 for (var i = 0; i < report.stats.values.length - 1; i += 2) {
31 if (report.stats.values[i] == 'ssrc') {
32 return report.stats.values[i + 1];
40 * SsrcInfoManager stores the ssrc stream info extracted from SDP.
42 var SsrcInfoManager = (function() {
48 function SsrcInfoManager() {
50 * Map from ssrc id to an object containing all the stream properties.
51 * @type {!Object.<string, !Object.<string>>}
54 this.streamInfoContainer_ = {};
57 * The string separating attibutes in an SDP.
62 this.ATTRIBUTE_SEPARATOR_ = /[\r,\n]/;
65 * The regex separating fields within an ssrc description.
70 this.FIELD_SEPARATOR_REGEX_ = / .*:/;
73 * The prefix string of an ssrc description.
78 this.SSRC_ATTRIBUTE_PREFIX_ = 'a=ssrc:';
81 * The className of the ssrc info parent element.
85 this.SSRC_INFO_BLOCK_CLASS = 'ssrc-info-block';
88 SsrcInfoManager.prototype = {
90 * Extracts the stream information from |sdp| and saves it.
92 * a=ssrc:1234 msid:abcd
93 * a=ssrc:1234 label:hello
95 * @param {string} sdp The SDP string.
97 addSsrcStreamInfo: function(sdp) {
98 var attributes = sdp.split(this.ATTRIBUTE_SEPARATOR_);
99 for (var i = 0; i < attributes.length; ++i) {
100 // Check if this is a ssrc attribute.
101 if (attributes[i].indexOf(this.SSRC_ATTRIBUTE_PREFIX_) != 0)
104 var nextFieldIndex = attributes[i].search(this.FIELD_SEPARATOR_REGEX_);
106 if (nextFieldIndex == -1)
109 var ssrc = attributes[i].substring(this.SSRC_ATTRIBUTE_PREFIX_.length,
111 if (!this.streamInfoContainer_[ssrc])
112 this.streamInfoContainer_[ssrc] = {};
114 // Make |rest| starting at the next field.
115 var rest = attributes[i].substring(nextFieldIndex + 1);
117 while (rest.length > 0) {
118 nextFieldIndex = rest.search(this.FIELD_SEPARATOR_REGEX_);
119 if (nextFieldIndex == -1)
120 nextFieldIndex = rest.length;
122 // The field name is the string before the colon.
123 name = rest.substring(0, rest.indexOf(':'));
124 // The field value is from after the colon to the next field.
125 value = rest.substring(rest.indexOf(':') + 1, nextFieldIndex);
126 this.streamInfoContainer_[ssrc][name] = value;
128 // Move |rest| to the start of the next field.
129 rest = rest.substring(nextFieldIndex + 1);
135 * @param {string} sdp The ssrc id.
136 * @return {!Object.<string>} The object containing the ssrc infomation.
138 getStreamInfo: function(ssrc) {
139 return this.streamInfoContainer_[ssrc];
143 * Populate the ssrc information into |parentElement|, each field as a
146 * @param {!Element} parentElement The parent element for the ssrc info.
147 * @param {string} ssrc The ssrc id.
149 populateSsrcInfo: function(parentElement, ssrc) {
150 if (!this.streamInfoContainer_[ssrc])
153 parentElement.className = this.SSRC_INFO_BLOCK_CLASS;
156 for (var property in this.streamInfoContainer_[ssrc]) {
157 fieldElement = document.createElement('div');
158 parentElement.appendChild(fieldElement);
159 fieldElement.textContent =
160 property + ':' + this.streamInfoContainer_[ssrc][property];
165 return SsrcInfoManager;