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synapse/contrib/jitsimeetbridge/unjingle/strophe.jingle.sdp.util.js

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2014-12-02 13:01:30 +01:00
/**
* Contains utility classes used in SDP class.
*
*/
/**
* Class holds a=ssrc lines and media type a=mid
* @param ssrc synchronization source identifier number(a=ssrc lines from SDP)
* @param type media type eg. "audio" or "video"(a=mid frm SDP)
* @constructor
*/
function ChannelSsrc(ssrc, type) {
this.ssrc = ssrc;
this.type = type;
this.lines = [];
}
/**
* Class holds a=ssrc-group: lines
* @param semantics
* @param ssrcs
* @constructor
*/
function ChannelSsrcGroup(semantics, ssrcs, line) {
this.semantics = semantics;
this.ssrcs = ssrcs;
}
/**
* Helper class represents media channel. Is a container for ChannelSsrc, holds channel idx and media type.
* @param channelNumber channel idx in SDP media array.
* @param mediaType media type(a=mid)
* @constructor
*/
function MediaChannel(channelNumber, mediaType) {
/**
* SDP channel number
* @type {*}
*/
this.chNumber = channelNumber;
/**
* Channel media type(a=mid)
* @type {*}
*/
this.mediaType = mediaType;
/**
* The maps of ssrc numbers to ChannelSsrc objects.
*/
this.ssrcs = {};
/**
* The array of ChannelSsrcGroup objects.
* @type {Array}
*/
this.ssrcGroups = [];
}
SDPUtil = {
iceparams: function (mediadesc, sessiondesc) {
var data = null;
if (SDPUtil.find_line(mediadesc, 'a=ice-ufrag:', sessiondesc) &&
SDPUtil.find_line(mediadesc, 'a=ice-pwd:', sessiondesc)) {
data = {
ufrag: SDPUtil.parse_iceufrag(SDPUtil.find_line(mediadesc, 'a=ice-ufrag:', sessiondesc)),
pwd: SDPUtil.parse_icepwd(SDPUtil.find_line(mediadesc, 'a=ice-pwd:', sessiondesc))
};
}
return data;
},
parse_iceufrag: function (line) {
return line.substring(12);
},
build_iceufrag: function (frag) {
return 'a=ice-ufrag:' + frag;
},
parse_icepwd: function (line) {
return line.substring(10);
},
build_icepwd: function (pwd) {
return 'a=ice-pwd:' + pwd;
},
parse_mid: function (line) {
return line.substring(6);
},
parse_mline: function (line) {
var parts = line.substring(2).split(' '),
data = {};
data.media = parts.shift();
data.port = parts.shift();
data.proto = parts.shift();
if (parts[parts.length - 1] === '') { // trailing whitespace
parts.pop();
}
data.fmt = parts;
return data;
},
build_mline: function (mline) {
return 'm=' + mline.media + ' ' + mline.port + ' ' + mline.proto + ' ' + mline.fmt.join(' ');
},
parse_rtpmap: function (line) {
var parts = line.substring(9).split(' '),
data = {};
data.id = parts.shift();
parts = parts[0].split('/');
data.name = parts.shift();
data.clockrate = parts.shift();
data.channels = parts.length ? parts.shift() : '1';
return data;
},
/**
* Parses SDP line "a=sctpmap:..." and extracts SCTP port from it.
* @param line eg. "a=sctpmap:5000 webrtc-datachannel"
* @returns [SCTP port number, protocol, streams]
*/
parse_sctpmap: function (line)
{
var parts = line.substring(10).split(' ');
var sctpPort = parts[0];
var protocol = parts[1];
// Stream count is optional
var streamCount = parts.length > 2 ? parts[2] : null;
return [sctpPort, protocol, streamCount];// SCTP port
},
build_rtpmap: function (el) {
var line = 'a=rtpmap:' + el.getAttribute('id') + ' ' + el.getAttribute('name') + '/' + el.getAttribute('clockrate');
if (el.getAttribute('channels') && el.getAttribute('channels') != '1') {
line += '/' + el.getAttribute('channels');
}
return line;
},
parse_crypto: function (line) {
var parts = line.substring(9).split(' '),
data = {};
data.tag = parts.shift();
data['crypto-suite'] = parts.shift();
data['key-params'] = parts.shift();
if (parts.length) {
data['session-params'] = parts.join(' ');
}
return data;
},
parse_fingerprint: function (line) { // RFC 4572
var parts = line.substring(14).split(' '),
data = {};
data.hash = parts.shift();
data.fingerprint = parts.shift();
// TODO assert that fingerprint satisfies 2UHEX *(":" 2UHEX) ?
return data;
},
parse_fmtp: function (line) {
var parts = line.split(' '),
i, key, value,
data = [];
parts.shift();
parts = parts.join(' ').split(';');
for (i = 0; i < parts.length; i++) {
key = parts[i].split('=')[0];
while (key.length && key[0] == ' ') {
key = key.substring(1);
}
value = parts[i].split('=')[1];
if (key && value) {
data.push({name: key, value: value});
} else if (key) {
// rfc 4733 (DTMF) style stuff
data.push({name: '', value: key});
}
}
return data;
},
parse_icecandidate: function (line) {
var candidate = {},
elems = line.split(' ');
candidate.foundation = elems[0].substring(12);
candidate.component = elems[1];
candidate.protocol = elems[2].toLowerCase();
candidate.priority = elems[3];
candidate.ip = elems[4];
candidate.port = elems[5];
// elems[6] => "typ"
candidate.type = elems[7];
candidate.generation = 0; // default value, may be overwritten below
for (var i = 8; i < elems.length; i += 2) {
switch (elems[i]) {
case 'raddr':
candidate['rel-addr'] = elems[i + 1];
break;
case 'rport':
candidate['rel-port'] = elems[i + 1];
break;
case 'generation':
candidate.generation = elems[i + 1];
break;
case 'tcptype':
candidate.tcptype = elems[i + 1];
break;
default: // TODO
console.log('parse_icecandidate not translating "' + elems[i] + '" = "' + elems[i + 1] + '"');
}
}
candidate.network = '1';
candidate.id = Math.random().toString(36).substr(2, 10); // not applicable to SDP -- FIXME: should be unique, not just random
return candidate;
},
build_icecandidate: function (cand) {
var line = ['a=candidate:' + cand.foundation, cand.component, cand.protocol, cand.priority, cand.ip, cand.port, 'typ', cand.type].join(' ');
line += ' ';
switch (cand.type) {
case 'srflx':
case 'prflx':
case 'relay':
if (cand.hasOwnAttribute('rel-addr') && cand.hasOwnAttribute('rel-port')) {
line += 'raddr';
line += ' ';
line += cand['rel-addr'];
line += ' ';
line += 'rport';
line += ' ';
line += cand['rel-port'];
line += ' ';
}
break;
}
if (cand.hasOwnAttribute('tcptype')) {
line += 'tcptype';
line += ' ';
line += cand.tcptype;
line += ' ';
}
line += 'generation';
line += ' ';
line += cand.hasOwnAttribute('generation') ? cand.generation : '0';
return line;
},
parse_ssrc: function (desc) {
// proprietary mapping of a=ssrc lines
// TODO: see "Jingle RTP Source Description" by Juberti and P. Thatcher on google docs
// and parse according to that
var lines = desc.split('\r\n'),
data = {};
for (var i = 0; i < lines.length; i++) {
if (lines[i].substring(0, 7) == 'a=ssrc:') {
var idx = lines[i].indexOf(' ');
data[lines[i].substr(idx + 1).split(':', 2)[0]] = lines[i].substr(idx + 1).split(':', 2)[1];
}
}
return data;
},
parse_rtcpfb: function (line) {
var parts = line.substr(10).split(' ');
var data = {};
data.pt = parts.shift();
data.type = parts.shift();
data.params = parts;
return data;
},
parse_extmap: function (line) {
var parts = line.substr(9).split(' ');
var data = {};
data.value = parts.shift();
if (data.value.indexOf('/') != -1) {
data.direction = data.value.substr(data.value.indexOf('/') + 1);
data.value = data.value.substr(0, data.value.indexOf('/'));
} else {
data.direction = 'both';
}
data.uri = parts.shift();
data.params = parts;
return data;
},
find_line: function (haystack, needle, sessionpart) {
var lines = haystack.split('\r\n');
for (var i = 0; i < lines.length; i++) {
if (lines[i].substring(0, needle.length) == needle) {
return lines[i];
}
}
if (!sessionpart) {
return false;
}
// search session part
lines = sessionpart.split('\r\n');
for (var j = 0; j < lines.length; j++) {
if (lines[j].substring(0, needle.length) == needle) {
return lines[j];
}
}
return false;
},
find_lines: function (haystack, needle, sessionpart) {
var lines = haystack.split('\r\n'),
needles = [];
for (var i = 0; i < lines.length; i++) {
if (lines[i].substring(0, needle.length) == needle)
needles.push(lines[i]);
}
if (needles.length || !sessionpart) {
return needles;
}
// search session part
lines = sessionpart.split('\r\n');
for (var j = 0; j < lines.length; j++) {
if (lines[j].substring(0, needle.length) == needle) {
needles.push(lines[j]);
}
}
return needles;
},
candidateToJingle: function (line) {
// a=candidate:2979166662 1 udp 2113937151 192.168.2.100 57698 typ host generation 0
// <candidate component=... foundation=... generation=... id=... ip=... network=... port=... priority=... protocol=... type=.../>
if (line.indexOf('candidate:') === 0) {
line = 'a=' + line;
} else if (line.substring(0, 12) != 'a=candidate:') {
console.log('parseCandidate called with a line that is not a candidate line');
console.log(line);
return null;
}
if (line.substring(line.length - 2) == '\r\n') // chomp it
line = line.substring(0, line.length - 2);
var candidate = {},
elems = line.split(' '),
i;
if (elems[6] != 'typ') {
console.log('did not find typ in the right place');
console.log(line);
return null;
}
candidate.foundation = elems[0].substring(12);
candidate.component = elems[1];
candidate.protocol = elems[2].toLowerCase();
candidate.priority = elems[3];
candidate.ip = elems[4];
candidate.port = elems[5];
// elems[6] => "typ"
candidate.type = elems[7];
candidate.generation = '0'; // default, may be overwritten below
for (i = 8; i < elems.length; i += 2) {
switch (elems[i]) {
case 'raddr':
candidate['rel-addr'] = elems[i + 1];
break;
case 'rport':
candidate['rel-port'] = elems[i + 1];
break;
case 'generation':
candidate.generation = elems[i + 1];
break;
case 'tcptype':
candidate.tcptype = elems[i + 1];
break;
default: // TODO
console.log('not translating "' + elems[i] + '" = "' + elems[i + 1] + '"');
}
}
candidate.network = '1';
candidate.id = Math.random().toString(36).substr(2, 10); // not applicable to SDP -- FIXME: should be unique, not just random
return candidate;
},
candidateFromJingle: function (cand) {
var line = 'a=candidate:';
line += cand.getAttribute('foundation');
line += ' ';
line += cand.getAttribute('component');
line += ' ';
line += cand.getAttribute('protocol'); //.toUpperCase(); // chrome M23 doesn't like this
line += ' ';
line += cand.getAttribute('priority');
line += ' ';
line += cand.getAttribute('ip');
line += ' ';
line += cand.getAttribute('port');
line += ' ';
line += 'typ';
line += ' ' + cand.getAttribute('type');
line += ' ';
switch (cand.getAttribute('type')) {
case 'srflx':
case 'prflx':
case 'relay':
if (cand.getAttribute('rel-addr') && cand.getAttribute('rel-port')) {
line += 'raddr';
line += ' ';
line += cand.getAttribute('rel-addr');
line += ' ';
line += 'rport';
line += ' ';
line += cand.getAttribute('rel-port');
line += ' ';
}
break;
}
if (cand.getAttribute('protocol').toLowerCase() == 'tcp') {
line += 'tcptype';
line += ' ';
line += cand.getAttribute('tcptype');
line += ' ';
}
line += 'generation';
line += ' ';
line += cand.getAttribute('generation') || '0';
return line + '\r\n';
}
};
exports.SDPUtil = SDPUtil;