/** * 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;