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