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Georgi Gerganov
2018-04-29 13:29:22 +03:00
parent b5bc223e73
commit 23fc4ca051
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22
sdp-transform/LICENSE Normal file
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(The MIT License)
Copyright (c) 2013 Eirik Albrigtsen
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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var grammar = {
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// default parsing of these only (though some of these feel outdated)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//k: [{}], // outdated thing ignored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:%d 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
push: 'ext',
reg: /^extmap:(\d+)(?:\/(\w+))? (\S*)(?: (\S*))?/,
names: ['value', 'direction', 'uri', 'config'],
format: function (o) {
return 'extmap:%d' + (o.direction ? '/%s' : '%v') + ' %s' + (o.config ? ' %s' : '');
}
},
{ //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=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*)/,
format: 'ptime:%d'
},
{ //a=maxptime:60
name: 'maxptime',
reg: /^maxptime:(\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'
},
{ // any a= that we don't understand is kepts 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';
}
});
});

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var parser = require('./parser');
var writer = require('./writer');
exports.write = writer;
exports.parse = parser.parse;
exports.parseFmtpConfig = parser.parseFmtpConfig;
exports.parseParams = parser.parseParams;
exports.parsePayloads = parser.parsePayloads;
exports.parseRemoteCandidates = parser.parseRemoteCandidates;
exports.parseImageAttributes = parser.parseImageAttributes;
exports.parseSimulcastStreamList = parser.parseSimulcastStreamList;

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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 validLine = RegExp.prototype.test.bind(/^([a-z])=(.*)/);
function parseSDP(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]);
}
return acc;
};
function parseParamsSDP(str) {
return str.split(/\;\s?/).reduce(paramReducer, {});
};
function parsePayloadsSDP(str) {
return str.split(' ').map(Number);
};
function parseRemoteCandidatesSDP(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;
};
function parseImageAttributesSDP(str) {
return str.split(' ').map(function (item) {
return item.substring(1, item.length-1).split(',').reduce(paramReducer, {});
});
};
function parseSimulcastStreamListSDP(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
};
});
});
};

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// 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'];
function writeSDP(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';
};