RTCPeerConnection.addTrack and removeTrack added (behind flag)

chrome/test/data/webrtc/munge_sdp.js

 /**
  * Copyright 2016 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.
  */
 
 /**
  * See |setSdpDefaultCodec|.
  */
 function setSdpDefaultAudioCodec(sdp, codec) {
@@ skipping 11 matching lines @@
  * Returns a modified version of |sdp| where the opus DTX flag has been
  * enabled.
  */
 function setOpusDtxEnabled(sdp) {
   var sdpLines = splitSdpLines(sdp);
 
   // Get default audio codec
   var defaultCodec = getSdpDefaultAudioCodec(sdp);
   if (defaultCodec !== 'opus') {
     failure('setOpusDtxEnabled',
-             'Default audio codec is not set to \'opus\'.');
+            'Default audio codec is not set to \'opus\'.');
   }
 
   // Find codec ID for Opus, e.g. 111 if 'a=rtpmap:111 opus/48000/2'.
   var codecId = findRtpmapId(sdpLines, 'opus');
   if (codecId === null) {
     failure('setOpusDtxEnabled', 'Unknown ID for |codec| = \'opus\'.');
   }
 
   // Find 'a=fmtp:111' line, where 111 is the codecId
   var fmtLineNo = findFmtpLine(sdpLines, codecId);
@@ skipping 14 matching lines @@
  * the default codec, i.e. the codec whose ID is first in the list of codecs on
  * the 'm=|type|' line, where |type| is 'audio' or 'video'.
  * @private
  */
 function setSdpDefaultCodec(sdp, type, codec) {
   var sdpLines = splitSdpLines(sdp);
 
   // Find codec ID, e.g. 100 for 'VP8' if 'a=rtpmap:100 VP8/9000'.
   var codecId = findRtpmapId(sdpLines, codec);
   if (codecId === null) {
-    failure('sdpPreferCodec', 'Unknown ID for |codec| = \'' + codec + '\'.');
+    failure('setSdpDefaultCodec',
+            'Unknown ID for |codec| = \'' + codec + '\'.');
   }
 
   // Find 'm=|type|' line, e.g. 'm=video 9 UDP/TLS/RTP/SAVPF 100 101 107 116'.
   var mLineNo = findLine(sdpLines, 'm=' + type);
   if (mLineNo === null) {
     failure('setSdpDefaultCodec',
-             '\'m=' + type + '\' line missing from |sdp|.');
+            '\'m=' + type + '\' line missing from |sdp|.');
   }
 
   // Modify video line to use the desired codec as the default.
   sdpLines[mLineNo] = setMLineDefaultCodec(sdpLines[mLineNo], codecId);
   return mergeSdpLines(sdpLines);
 }
 
 /**
  * See |getSdpDefaultCodec|.
  */
@@ skipping 14 matching lines @@
  * is 'audio' or 'video'.
  * @private
  */
 function getSdpDefaultCodec(sdp, type) {
   var sdpLines = splitSdpLines(sdp);
 
   // Find 'm=|type|' line, e.g. 'm=video 9 UDP/TLS/RTP/SAVPF 100 101 107 116'.
   var mLineNo = findLine(sdpLines, 'm=' + type);
   if (mLineNo === null) {
     failure('getSdpDefaultCodec',
-             '\'m=' + type + '\' line missing from |sdp|.');
+            '\'m=' + type + '\' line missing from |sdp|.');
   }
 
   // The default codec's ID.
   var defaultCodecId = getMLineDefaultCodec(sdpLines[mLineNo]);
   if (defaultCodecId === null) {
     failure('getSdpDefaultCodec',
-             '\'m=' + type + '\' line contains no codecs.');
+            '\'m=' + type + '\' line contains no codecs.');
   }
 
   // Find codec name, e.g. 'VP8' for 100 if 'a=rtpmap:100 VP8/9000'.
   var defaultCodec = findRtpmapCodec(sdpLines, defaultCodecId);
   if (defaultCodec === null) {
     failure('getSdpDefaultCodec',
-             'Unknown codec name for default codec ' + defaultCodecId + '.');
+            'Unknown codec name for default codec ' + defaultCodecId + '.');
   }
   return defaultCodec;
 }
 
 /**
  * Searches through all |sdpLines| for the 'a=rtpmap:' line for the codec of
  * the specified name, returning its ID as an int if found, or null otherwise.
  * |codec| is the case-sensitive name of the codec.
  * For example, if |sdpLines| contains 'a=rtpmap:100 VP8/9000' and |codec| is
  * 'VP8', this function returns 100.
@@ skipping 103 matching lines @@
 function splitSdpLines(sdp) {
   return sdp.split('\r\n');
 }
 
 /** @private */
 function mergeSdpLines(sdpLines) {
   return sdpLines.join('\r\n');
 }
 
 /** @private */
-function findLine(lines, startsWith) {
-  for (var i = 0; i < lines.length; i++) {
-    if (lines[i].startsWith(startsWith))
+function findLine(lines, lineStartsWith, startingLine = 0) {
+  for (var i = startingLine; i < lines.length; i++) {
+    if (lines[i].startsWith(lineStartsWith))
       return i;
   }
   return null;
 }