Updated 18 files, added 1692 files and deleted includes/system/compare.inc (automated)

4 files changed, 743 insertions, 0 deletions

diff --git a/includes/external/matrix/node_modules/sdp-transform/lib/grammar.js b/includes/external/matrix/node_modules/sdp-transform/lib/grammar.js
new file mode 100644
index 0000000..d8178e8
--- /dev/null
+++ b/includes/external/matrix/node_modules/sdp-transform/lib/grammar.js
@@ -0,0 +1,494 @@
+var grammar = module.exports = {
+  v: [{
+    name: 'version',
+    reg: /^(\d*)$/
+  }],
+  o: [{
+    // o=- 20518 0 IN IP4 203.0.113.1
+    // NB: sessionId will be a String in most cases because it is huge
+    name: 'origin',
+    reg: /^(\S*) (\d*) (\d*) (\S*) IP(\d) (\S*)/,
+    names: ['username', 'sessionId', 'sessionVersion', 'netType', 'ipVer', 'address'],
+    format: '%s %s %d %s IP%d %s'
+  }],
+  // default parsing of these only (though some of these feel outdated)
+  s: [{ name: 'name' }],
+  i: [{ name: 'description' }],
+  u: [{ name: 'uri' }],
+  e: [{ name: 'email' }],
+  p: [{ name: 'phone' }],
+  z: [{ name: 'timezones' }], // TODO: this one can actually be parsed properly...
+  r: [{ name: 'repeats' }],   // TODO: this one can also be parsed properly
+  // k: [{}], // outdated thing ignored
+  t: [{
+    // t=0 0
+    name: 'timing',
+    reg: /^(\d*) (\d*)/,
+    names: ['start', 'stop'],
+    format: '%d %d'
+  }],
+  c: [{
+    // c=IN IP4 10.47.197.26
+    name: 'connection',
+    reg: /^IN IP(\d) (\S*)/,
+    names: ['version', 'ip'],
+    format: 'IN IP%d %s'
+  }],
+  b: [{
+    // b=AS:4000
+    push: 'bandwidth',
+    reg: /^(TIAS|AS|CT|RR|RS):(\d*)/,
+    names: ['type', 'limit'],
+    format: '%s:%s'
+  }],
+  m: [{
+    // m=video 51744 RTP/AVP 126 97 98 34 31
+    // NB: special - pushes to session
+    // TODO: rtp/fmtp should be filtered by the payloads found here?
+    reg: /^(\w*) (\d*) ([\w/]*)(?: (.*))?/,
+    names: ['type', 'port', 'protocol', 'payloads'],
+    format: '%s %d %s %s'
+  }],
+  a: [
+    {
+      // a=rtpmap:110 opus/48000/2
+      push: 'rtp',
+      reg: /^rtpmap:(\d*) ([\w\-.]*)(?:\s*\/(\d*)(?:\s*\/(\S*))?)?/,
+      names: ['payload', 'codec', 'rate', 'encoding'],
+      format: function (o) {
+        return (o.encoding)
+          ? 'rtpmap:%d %s/%s/%s'
+          : o.rate
+            ? 'rtpmap:%d %s/%s'
+            : 'rtpmap:%d %s';
+      }
+    },
+    {
+      // a=fmtp:108 profile-level-id=24;object=23;bitrate=64000
+      // a=fmtp:111 minptime=10; useinbandfec=1
+      push: 'fmtp',
+      reg: /^fmtp:(\d*) ([\S| ]*)/,
+      names: ['payload', 'config'],
+      format: 'fmtp:%d %s'
+    },
+    {
+      // a=control:streamid=0
+      name: 'control',
+      reg: /^control:(.*)/,
+      format: 'control:%s'
+    },
+    {
+      // a=rtcp:65179 IN IP4 193.84.77.194
+      name: 'rtcp',
+      reg: /^rtcp:(\d*)(?: (\S*) IP(\d) (\S*))?/,
+      names: ['port', 'netType', 'ipVer', 'address'],
+      format: function (o) {
+        return (o.address != null)
+          ? 'rtcp:%d %s IP%d %s'
+          : 'rtcp:%d';
+      }
+    },
+    {
+      // a=rtcp-fb:98 trr-int 100
+      push: 'rtcpFbTrrInt',
+      reg: /^rtcp-fb:(\*|\d*) trr-int (\d*)/,
+      names: ['payload', 'value'],
+      format: 'rtcp-fb:%s trr-int %d'
+    },
+    {
+      // a=rtcp-fb:98 nack rpsi
+      push: 'rtcpFb',
+      reg: /^rtcp-fb:(\*|\d*) ([\w-_]*)(?: ([\w-_]*))?/,
+      names: ['payload', 'type', 'subtype'],
+      format: function (o) {
+        return (o.subtype != null)
+          ? 'rtcp-fb:%s %s %s'
+          : 'rtcp-fb:%s %s';
+      }
+    },
+    {
+      // a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
+      // a=extmap:1/recvonly URI-gps-string
+      // a=extmap:3 urn:ietf:params:rtp-hdrext:encrypt urn:ietf:params:rtp-hdrext:smpte-tc 25@600/24
+      push: 'ext',
+      reg: /^extmap:(\d+)(?:\/(\w+))?(?: (urn:ietf:params:rtp-hdrext:encrypt))? (\S*)(?: (\S*))?/,
+      names: ['value', 'direction', 'encrypt-uri', 'uri', 'config'],
+      format: function (o) {
+        return (
+          'extmap:%d' +
+          (o.direction ? '/%s' : '%v') +
+          (o['encrypt-uri'] ? ' %s' : '%v') +
+          ' %s' +
+          (o.config ? ' %s' : '')
+        );
+      }
+    },
+    {
+      // a=extmap-allow-mixed
+      name: 'extmapAllowMixed',
+      reg: /^(extmap-allow-mixed)/
+    },
+    {
+      // a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:PS1uQCVeeCFCanVmcjkpPywjNWhcYD0mXXtxaVBR|2^20|1:32
+      push: 'crypto',
+      reg: /^crypto:(\d*) ([\w_]*) (\S*)(?: (\S*))?/,
+      names: ['id', 'suite', 'config', 'sessionConfig'],
+      format: function (o) {
+        return (o.sessionConfig != null)
+          ? 'crypto:%d %s %s %s'
+          : 'crypto:%d %s %s';
+      }
+    },
+    {
+      // a=setup:actpass
+      name: 'setup',
+      reg: /^setup:(\w*)/,
+      format: 'setup:%s'
+    },
+    {
+      // a=connection:new
+      name: 'connectionType',
+      reg: /^connection:(new|existing)/,
+      format: 'connection:%s'
+    },
+    {
+      // a=mid:1
+      name: 'mid',
+      reg: /^mid:([^\s]*)/,
+      format: 'mid:%s'
+    },
+    {
+      // a=msid:0c8b064d-d807-43b4-b434-f92a889d8587 98178685-d409-46e0-8e16-7ef0db0db64a
+      name: 'msid',
+      reg: /^msid:(.*)/,
+      format: 'msid:%s'
+    },
+    {
+      // a=ptime:20
+      name: 'ptime',
+      reg: /^ptime:(\d*(?:\.\d*)*)/,
+      format: 'ptime:%d'
+    },
+    {
+      // a=maxptime:60
+      name: 'maxptime',
+      reg: /^maxptime:(\d*(?:\.\d*)*)/,
+      format: 'maxptime:%d'
+    },
+    {
+      // a=sendrecv
+      name: 'direction',
+      reg: /^(sendrecv|recvonly|sendonly|inactive)/
+    },
+    {
+      // a=ice-lite
+      name: 'icelite',
+      reg: /^(ice-lite)/
+    },
+    {
+      // a=ice-ufrag:F7gI
+      name: 'iceUfrag',
+      reg: /^ice-ufrag:(\S*)/,
+      format: 'ice-ufrag:%s'
+    },
+    {
+      // a=ice-pwd:x9cml/YzichV2+XlhiMu8g
+      name: 'icePwd',
+      reg: /^ice-pwd:(\S*)/,
+      format: 'ice-pwd:%s'
+    },
+    {
+      // a=fingerprint:SHA-1 00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF:00:11:22:33
+      name: 'fingerprint',
+      reg: /^fingerprint:(\S*) (\S*)/,
+      names: ['type', 'hash'],
+      format: 'fingerprint:%s %s'
+    },
+    {
+      // a=candidate:0 1 UDP 2113667327 203.0.113.1 54400 typ host
+      // a=candidate:1162875081 1 udp 2113937151 192.168.34.75 60017 typ host generation 0 network-id 3 network-cost 10
+      // a=candidate:3289912957 2 udp 1845501695 193.84.77.194 60017 typ srflx raddr 192.168.34.75 rport 60017 generation 0 network-id 3 network-cost 10
+      // a=candidate:229815620 1 tcp 1518280447 192.168.150.19 60017 typ host tcptype active generation 0 network-id 3 network-cost 10
+      // a=candidate:3289912957 2 tcp 1845501695 193.84.77.194 60017 typ srflx raddr 192.168.34.75 rport 60017 tcptype passive generation 0 network-id 3 network-cost 10
+      push:'candidates',
+      reg: /^candidate:(\S*) (\d*) (\S*) (\d*) (\S*) (\d*) typ (\S*)(?: raddr (\S*) rport (\d*))?(?: tcptype (\S*))?(?: generation (\d*))?(?: network-id (\d*))?(?: network-cost (\d*))?/,
+      names: ['foundation', 'component', 'transport', 'priority', 'ip', 'port', 'type', 'raddr', 'rport', 'tcptype', 'generation', 'network-id', 'network-cost'],
+      format: function (o) {
+        var str = 'candidate:%s %d %s %d %s %d typ %s';
+
+        str += (o.raddr != null) ? ' raddr %s rport %d' : '%v%v';
+
+        // NB: candidate has three optional chunks, so %void middles one if it's missing
+        str += (o.tcptype != null) ? ' tcptype %s' : '%v';
+
+        if (o.generation != null) {
+          str += ' generation %d';
+        }
+
+        str += (o['network-id'] != null) ? ' network-id %d' : '%v';
+        str += (o['network-cost'] != null) ? ' network-cost %d' : '%v';
+        return str;
+      }
+    },
+    {
+      // a=end-of-candidates (keep after the candidates line for readability)
+      name: 'endOfCandidates',
+      reg: /^(end-of-candidates)/
+    },
+    {
+      // a=remote-candidates:1 203.0.113.1 54400 2 203.0.113.1 54401 ...
+      name: 'remoteCandidates',
+      reg: /^remote-candidates:(.*)/,
+      format: 'remote-candidates:%s'
+    },
+    {
+      // a=ice-options:google-ice
+      name: 'iceOptions',
+      reg: /^ice-options:(\S*)/,
+      format: 'ice-options:%s'
+    },
+    {
+      // a=ssrc:2566107569 cname:t9YU8M1UxTF8Y1A1
+      push: 'ssrcs',
+      reg: /^ssrc:(\d*) ([\w_-]*)(?::(.*))?/,
+      names: ['id', 'attribute', 'value'],
+      format: function (o) {
+        var str = 'ssrc:%d';
+        if (o.attribute != null) {
+          str += ' %s';
+          if (o.value != null) {
+            str += ':%s';
+          }
+        }
+        return str;
+      }
+    },
+    {
+      // a=ssrc-group:FEC 1 2
+      // a=ssrc-group:FEC-FR 3004364195 1080772241
+      push: 'ssrcGroups',
+      // token-char = %x21 / %x23-27 / %x2A-2B / %x2D-2E / %x30-39 / %x41-5A / %x5E-7E
+      reg: /^ssrc-group:([\x21\x23\x24\x25\x26\x27\x2A\x2B\x2D\x2E\w]*) (.*)/,
+      names: ['semantics', 'ssrcs'],
+      format: 'ssrc-group:%s %s'
+    },
+    {
+      // a=msid-semantic: WMS Jvlam5X3SX1OP6pn20zWogvaKJz5Hjf9OnlV
+      name: 'msidSemantic',
+      reg: /^msid-semantic:\s?(\w*) (\S*)/,
+      names: ['semantic', 'token'],
+      format: 'msid-semantic: %s %s' // space after ':' is not accidental
+    },
+    {
+      // a=group:BUNDLE audio video
+      push: 'groups',
+      reg: /^group:(\w*) (.*)/,
+      names: ['type', 'mids'],
+      format: 'group:%s %s'
+    },
+    {
+      // a=rtcp-mux
+      name: 'rtcpMux',
+      reg: /^(rtcp-mux)/
+    },
+    {
+      // a=rtcp-rsize
+      name: 'rtcpRsize',
+      reg: /^(rtcp-rsize)/
+    },
+    {
+      // a=sctpmap:5000 webrtc-datachannel 1024
+      name: 'sctpmap',
+      reg: /^sctpmap:([\w_/]*) (\S*)(?: (\S*))?/,
+      names: ['sctpmapNumber', 'app', 'maxMessageSize'],
+      format: function (o) {
+        return (o.maxMessageSize != null)
+          ? 'sctpmap:%s %s %s'
+          : 'sctpmap:%s %s';
+      }
+    },
+    {
+      // a=x-google-flag:conference
+      name: 'xGoogleFlag',
+      reg: /^x-google-flag:([^\s]*)/,
+      format: 'x-google-flag:%s'
+    },
+    {
+      // a=rid:1 send max-width=1280;max-height=720;max-fps=30;depend=0
+      push: 'rids',
+      reg: /^rid:([\d\w]+) (\w+)(?: ([\S| ]*))?/,
+      names: ['id', 'direction', 'params'],
+      format: function (o) {
+        return (o.params) ? 'rid:%s %s %s' : 'rid:%s %s';
+      }
+    },
+    {
+      // a=imageattr:97 send [x=800,y=640,sar=1.1,q=0.6] [x=480,y=320] recv [x=330,y=250]
+      // a=imageattr:* send [x=800,y=640] recv *
+      // a=imageattr:100 recv [x=320,y=240]
+      push: 'imageattrs',
+      reg: new RegExp(
+        // a=imageattr:97
+        '^imageattr:(\\d+|\\*)' +
+        // send [x=800,y=640,sar=1.1,q=0.6] [x=480,y=320]
+        '[\\s\\t]+(send|recv)[\\s\\t]+(\\*|\\[\\S+\\](?:[\\s\\t]+\\[\\S+\\])*)' +
+        // recv [x=330,y=250]
+        '(?:[\\s\\t]+(recv|send)[\\s\\t]+(\\*|\\[\\S+\\](?:[\\s\\t]+\\[\\S+\\])*))?'
+      ),
+      names: ['pt', 'dir1', 'attrs1', 'dir2', 'attrs2'],
+      format: function (o) {
+        return 'imageattr:%s %s %s' + (o.dir2 ? ' %s %s' : '');
+      }
+    },
+    {
+      // a=simulcast:send 1,2,3;~4,~5 recv 6;~7,~8
+      // a=simulcast:recv 1;4,5 send 6;7
+      name: 'simulcast',
+      reg: new RegExp(
+        // a=simulcast:
+        '^simulcast:' +
+        // send 1,2,3;~4,~5
+        '(send|recv) ([a-zA-Z0-9\\-_~;,]+)' +
+        // space + recv 6;~7,~8
+        '(?:\\s?(send|recv) ([a-zA-Z0-9\\-_~;,]+))?' +
+        // end
+        '$'
+      ),
+      names: ['dir1', 'list1', 'dir2', 'list2'],
+      format: function (o) {
+        return 'simulcast:%s %s' + (o.dir2 ? ' %s %s' : '');
+      }
+    },
+    {
+      // old simulcast draft 03 (implemented by Firefox)
+      //   https://tools.ietf.org/html/draft-ietf-mmusic-sdp-simulcast-03
+      // a=simulcast: recv pt=97;98 send pt=97
+      // a=simulcast: send rid=5;6;7 paused=6,7
+      name: 'simulcast_03',
+      reg: /^simulcast:[\s\t]+([\S+\s\t]+)$/,
+      names: ['value'],
+      format: 'simulcast: %s'
+    },
+    {
+      // a=framerate:25
+      // a=framerate:29.97
+      name: 'framerate',
+      reg: /^framerate:(\d+(?:$|\.\d+))/,
+      format: 'framerate:%s'
+    },
+    {
+      // RFC4570
+      // a=source-filter: incl IN IP4 239.5.2.31 10.1.15.5
+      name: 'sourceFilter',
+      reg: /^source-filter: *(excl|incl) (\S*) (IP4|IP6|\*) (\S*) (.*)/,
+      names: ['filterMode', 'netType', 'addressTypes', 'destAddress', 'srcList'],
+      format: 'source-filter: %s %s %s %s %s'
+    },
+    {
+      // a=bundle-only
+      name: 'bundleOnly',
+      reg: /^(bundle-only)/
+    },
+    {
+      // a=label:1
+      name: 'label',
+      reg: /^label:(.+)/,
+      format: 'label:%s'
+    },
+    {
+      // RFC version 26 for SCTP over DTLS
+      // https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-5
+      name: 'sctpPort',
+      reg: /^sctp-port:(\d+)$/,
+      format: 'sctp-port:%s'
+    },
+    {
+      // RFC version 26 for SCTP over DTLS
+      // https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-6
+      name: 'maxMessageSize',
+      reg: /^max-message-size:(\d+)$/,
+      format: 'max-message-size:%s'
+    },
+    {
+      // RFC7273
+      // a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:37
+      push:'tsRefClocks',
+      reg: /^ts-refclk:([^\s=]*)(?:=(\S*))?/,
+      names: ['clksrc', 'clksrcExt'],
+      format: function (o) {
+        return 'ts-refclk:%s' + (o.clksrcExt != null ? '=%s' : '');
+      }
+    },
+    {
+      // RFC7273
+      // a=mediaclk:direct=963214424
+      name:'mediaClk',
+      reg: /^mediaclk:(?:id=(\S*))? *([^\s=]*)(?:=(\S*))?(?: *rate=(\d+)\/(\d+))?/,
+      names: ['id', 'mediaClockName', 'mediaClockValue', 'rateNumerator', 'rateDenominator'],
+      format: function (o) {
+        var str = 'mediaclk:';
+        str += (o.id != null ? 'id=%s %s' : '%v%s');
+        str += (o.mediaClockValue != null ? '=%s' : '');
+        str += (o.rateNumerator != null ? ' rate=%s' : '');
+        str += (o.rateDenominator != null ? '/%s' : '');
+        return str;
+      }
+    },
+    {
+      // a=keywds:keywords
+      name: 'keywords',
+      reg: /^keywds:(.+)$/,
+      format: 'keywds:%s'
+    },
+    {
+      // a=content:main
+      name: 'content',
+      reg: /^content:(.+)/,
+      format: 'content:%s'
+    },
+    // BFCP https://tools.ietf.org/html/rfc4583
+    {
+      // a=floorctrl:c-s
+      name: 'bfcpFloorCtrl',
+      reg: /^floorctrl:(c-only|s-only|c-s)/,
+      format: 'floorctrl:%s'
+    },
+    {
+      // a=confid:1
+      name: 'bfcpConfId',
+      reg: /^confid:(\d+)/,
+      format: 'confid:%s'
+    },
+    {
+      // a=userid:1
+      name: 'bfcpUserId',
+      reg: /^userid:(\d+)/,
+      format: 'userid:%s'
+    },
+    {
+      // a=floorid:1
+      name: 'bfcpFloorId',
+      reg: /^floorid:(.+) (?:m-stream|mstrm):(.+)/,
+      names: ['id', 'mStream'],
+      format: 'floorid:%s mstrm:%s'
+    },
+    {
+      // any a= that we don't understand is kept verbatim on media.invalid
+      push: 'invalid',
+      names: ['value']
+    }
+  ]
+};
+
+// set sensible defaults to avoid polluting the grammar with boring details
+Object.keys(grammar).forEach(function (key) {
+  var objs = grammar[key];
+  objs.forEach(function (obj) {
+    if (!obj.reg) {
+      obj.reg = /(.*)/;
+    }
+    if (!obj.format) {
+      obj.format = '%s';
+    }
+  });
+});
diff --git a/includes/external/matrix/node_modules/sdp-transform/lib/index.js b/includes/external/matrix/node_modules/sdp-transform/lib/index.js
new file mode 100644
index 0000000..0a27894
--- /dev/null
+++ b/includes/external/matrix/node_modules/sdp-transform/lib/index.js
@@ -0,0 +1,11 @@
+var parser = require('./parser');
+var writer = require('./writer');
+
+exports.write = writer;
+exports.parse = parser.parse;
+exports.parseParams = parser.parseParams;
+exports.parseFmtpConfig = parser.parseFmtpConfig; // Alias of parseParams().
+exports.parsePayloads = parser.parsePayloads;
+exports.parseRemoteCandidates = parser.parseRemoteCandidates;
+exports.parseImageAttributes = parser.parseImageAttributes;
+exports.parseSimulcastStreamList = parser.parseSimulcastStreamList;
diff --git a/includes/external/matrix/node_modules/sdp-transform/lib/parser.js b/includes/external/matrix/node_modules/sdp-transform/lib/parser.js
new file mode 100644
index 0000000..ac86397
--- /dev/null
+++ b/includes/external/matrix/node_modules/sdp-transform/lib/parser.js
@@ -0,0 +1,124 @@
+var toIntIfInt = function (v) {
+  return String(Number(v)) === v ? Number(v) : v;
+};
+
+var attachProperties = function (match, location, names, rawName) {
+  if (rawName && !names) {
+    location[rawName] = toIntIfInt(match[1]);
+  }
+  else {
+    for (var i = 0; i < names.length; i += 1) {
+      if (match[i+1] != null) {
+        location[names[i]] = toIntIfInt(match[i+1]);
+      }
+    }
+  }
+};
+
+var parseReg = function (obj, location, content) {
+  var needsBlank = obj.name && obj.names;
+  if (obj.push && !location[obj.push]) {
+    location[obj.push] = [];
+  }
+  else if (needsBlank && !location[obj.name]) {
+    location[obj.name] = {};
+  }
+  var keyLocation = obj.push ?
+    {} :  // blank object that will be pushed
+    needsBlank ? location[obj.name] : location; // otherwise, named location or root
+
+  attachProperties(content.match(obj.reg), keyLocation, obj.names, obj.name);
+
+  if (obj.push) {
+    location[obj.push].push(keyLocation);
+  }
+};
+
+var grammar = require('./grammar');
+var validLine = RegExp.prototype.test.bind(/^([a-z])=(.*)/);
+
+exports.parse = function (sdp) {
+  var session = {}
+    , media = []
+    , location = session; // points at where properties go under (one of the above)
+
+  // parse lines we understand
+  sdp.split(/(\r\n|\r|\n)/).filter(validLine).forEach(function (l) {
+    var type = l[0];
+    var content = l.slice(2);
+    if (type === 'm') {
+      media.push({rtp: [], fmtp: []});
+      location = media[media.length-1]; // point at latest media line
+    }
+
+    for (var j = 0; j < (grammar[type] || []).length; j += 1) {
+      var obj = grammar[type][j];
+      if (obj.reg.test(content)) {
+        return parseReg(obj, location, content);
+      }
+    }
+  });
+
+  session.media = media; // link it up
+  return session;
+};
+
+var paramReducer = function (acc, expr) {
+  var s = expr.split(/=(.+)/, 2);
+  if (s.length === 2) {
+    acc[s[0]] = toIntIfInt(s[1]);
+  } else if (s.length === 1 && expr.length > 1) {
+    acc[s[0]] = undefined;
+  }
+  return acc;
+};
+
+exports.parseParams = function (str) {
+  return str.split(/;\s?/).reduce(paramReducer, {});
+};
+
+// For backward compatibility - alias will be removed in 3.0.0
+exports.parseFmtpConfig = exports.parseParams;
+
+exports.parsePayloads = function (str) {
+  return str.toString().split(' ').map(Number);
+};
+
+exports.parseRemoteCandidates = function (str) {
+  var candidates = [];
+  var parts = str.split(' ').map(toIntIfInt);
+  for (var i = 0; i < parts.length; i += 3) {
+    candidates.push({
+      component: parts[i],
+      ip: parts[i + 1],
+      port: parts[i + 2]
+    });
+  }
+  return candidates;
+};
+
+exports.parseImageAttributes = function (str) {
+  return str.split(' ').map(function (item) {
+    return item.substring(1, item.length-1).split(',').reduce(paramReducer, {});
+  });
+};
+
+exports.parseSimulcastStreamList = function (str) {
+  return str.split(';').map(function (stream) {
+    return stream.split(',').map(function (format) {
+      var scid, paused = false;
+
+      if (format[0] !== '~') {
+        scid = toIntIfInt(format);
+      } else {
+        scid = toIntIfInt(format.substring(1, format.length));
+        paused = true;
+      }
+
+      return {
+        scid: scid,
+        paused: paused
+      };
+    });
+  });
+};
diff --git a/includes/external/matrix/node_modules/sdp-transform/lib/writer.js b/includes/external/matrix/node_modules/sdp-transform/lib/writer.js
new file mode 100644
index 0000000..decdf48
--- /dev/null
+++ b/includes/external/matrix/node_modules/sdp-transform/lib/writer.js
@@ -0,0 +1,114 @@
+var grammar = require('./grammar');
+
+// customized util.format - discards excess arguments and can void middle ones
+var formatRegExp = /%[sdv%]/g;
+var format = function (formatStr) {
+  var i = 1;
+  var args = arguments;
+  var len = args.length;
+  return formatStr.replace(formatRegExp, function (x) {
+    if (i >= len) {
+      return x; // missing argument
+    }
+    var arg = args[i];
+    i += 1;
+    switch (x) {
+    case '%%':
+      return '%';
+    case '%s':
+      return String(arg);
+    case '%d':
+      return Number(arg);
+    case '%v':
+      return '';
+    }
+  });
+  // NB: we discard excess arguments - they are typically undefined from makeLine
+};
+
+var makeLine = function (type, obj, location) {
+  var str = obj.format instanceof Function ?
+    (obj.format(obj.push ? location : location[obj.name])) :
+    obj.format;
+
+  var args = [type + '=' + str];
+  if (obj.names) {
+    for (var i = 0; i < obj.names.length; i += 1) {
+      var n = obj.names[i];
+      if (obj.name) {
+        args.push(location[obj.name][n]);
+      }
+      else { // for mLine and push attributes
+        args.push(location[obj.names[i]]);
+      }
+    }
+  }
+  else {
+    args.push(location[obj.name]);
+  }
+  return format.apply(null, args);
+};
+
+// RFC specified order
+// TODO: extend this with all the rest
+var defaultOuterOrder = [
+  'v', 'o', 's', 'i',
+  'u', 'e', 'p', 'c',
+  'b', 't', 'r', 'z', 'a'
+];
+var defaultInnerOrder = ['i', 'c', 'b', 'a'];
+
+
+module.exports = function (session, opts) {
+  opts = opts || {};
+  // ensure certain properties exist
+  if (session.version == null) {
+    session.version = 0; // 'v=0' must be there (only defined version atm)
+  }
+  if (session.name == null) {
+    session.name = ' '; // 's= ' must be there if no meaningful name set
+  }
+  session.media.forEach(function (mLine) {
+    if (mLine.payloads == null) {
+      mLine.payloads = '';
+    }
+  });
+
+  var outerOrder = opts.outerOrder || defaultOuterOrder;
+  var innerOrder = opts.innerOrder || defaultInnerOrder;
+  var sdp = [];
+
+  // loop through outerOrder for matching properties on session
+  outerOrder.forEach(function (type) {
+    grammar[type].forEach(function (obj) {
+      if (obj.name in session && session[obj.name] != null) {
+        sdp.push(makeLine(type, obj, session));
+      }
+      else if (obj.push in session && session[obj.push] != null) {
+        session[obj.push].forEach(function (el) {
+          sdp.push(makeLine(type, obj, el));
+        });
+      }
+    });
+  });
+
+  // then for each media line, follow the innerOrder
+  session.media.forEach(function (mLine) {
+    sdp.push(makeLine('m', grammar.m[0], mLine));
+
+    innerOrder.forEach(function (type) {
+      grammar[type].forEach(function (obj) {
+        if (obj.name in mLine && mLine[obj.name] != null) {
+          sdp.push(makeLine(type, obj, mLine));
+        }
+        else if (obj.push in mLine && mLine[obj.push] != null) {
+          mLine[obj.push].forEach(function (el) {
+            sdp.push(makeLine(type, obj, el));
+          });
+        }
+      });
+    });
+  });
+
+  return sdp.join('\r\n') + '\r\n';
+};