Implementation
var grammar = {
'v': [
{'name': 'version', 'reg': r'^(\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': r'^(\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// default parsing of these only (though some of these feel outdated)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', 'reg': r'^(\S*)'}
],
'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// k: [{}], // outdated thing ignored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': r'^(\d*) (\d*)',
'names': ['start', 'stop'],
'format': '%d %d'
}
],
'c': [
{
// c=IN IP4 10.47.197.26
'name': 'connection',
'reg': r'^IN IP(\d) (\S*)',
'names': ['version', 'ip'],
'format': 'IN IP%d %s'
}
],
'b': [
{
// b=AS:4000
'push': 'bandwidth',
'reg': r'^(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': r'^(\w*) (\d*) ([\w/]*)(?: (.*))?',
'names': ['type', 'port', 'protocol', 'payloads'],
'format': '%s %d %s %s'
}
],
'a': [
{
// a=rtpmap:110 opus/48000/2
'push': 'rtp',
'reg': r'^rtpmap:(\d*) ([\w\-.]*)(?:\s*\/(\d*)(?:\s*\/(\S*))?)?',
'names': ['payload', 'codec', 'rate', 'encoding'],
'format': (o) {
return (o['encoding'] != null)
? 'rtpmap:%d %s/%s/%s'
: (o['rate'] != null)
? 'rtpmap:%d %s/%s'
: 'rtpmap:%d %s';
} as dynamic
},
{
// a=fmtp:108 profile-level-id=24;object=23;bitrate=64000
// a=fmtp:111 minptime=10; useinbandfec=1
'push': 'fmtp',
'reg': r'^fmtp:(\d*) ([\S| ]*)',
'names': ['payload', 'config'],
'format': 'fmtp:%d %s'
},
{
// a=control:streamid=0
'name': 'control',
'reg': r'^control:(.*)',
'format': 'control:%s'
},
{
// a=rtcp:65179 IN IP4 193.84.77.194
'name': 'rtcp',
'reg': r'^rtcp:(\d*)(?: (\S*) IP(\d) (\S*))?',
'names': ['port', 'netType', 'ipVer', 'address'],
'format': (o) {
return (o['address'] != null) ? 'rtcp:%d %s IP%d %s' : 'rtcp:%d';
} as dynamic
},
{
// a=rtcp-fb:98 trr-int 100
'push': 'rtcpFbTrrInt',
'reg': r'^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': r'^rtcp-fb:(\*|\d*) ([\w-_]*)(?: ([\w-_]*))?',
'names': ['payload', 'type', 'subtype'],
'format': (o) {
return (o['subtype'] != null) ? 'rtcp-fb:%s %s %s' : 'rtcp-fb:%s %s';
} as dynamic
},
{
// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
// a=extmap:1/recvonly URI-gps-string
'push': 'ext',
'reg': r'^extmap:(\d+)(?:\/(\w+))? (\S*)(?: (\S*))?',
'names': ['value', 'direction', 'uri', 'config'],
'format': (o) {
return 'extmap:%d' +
(o['direction'] != null ? '/%s' : '%v') +
' %s' +
(o['config'] != null ? ' %s' : '');
} as dynamic
},
{
// a=extmap-allow-mixed
'name': 'extmap-allow-mixed',
'push': 'extmapAllowMixed',
'reg': r'^extmap-allow-mixed',
},
{
// a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:PS1uQCVeeCFCanVmcjkpPywjNWhcYD0mXXtxaVBR|2^20|1:32
'push': 'crypto',
'reg': r'^crypto:(\d*) ([\w_]*) (\S*)(?: (\S*))?',
'names': ['id', 'suite', 'config', 'sessionConfig'],
'format': (o) {
return (o['sessionConfig'] != null)
? 'crypto:%d %s %s %s'
: 'crypto:%d %s %s';
} as dynamic
},
{
// a=setup:actpass
'name': 'setup',
'reg': r'^setup:(\w*)',
'format': 'setup:%s'
},
{
// a=mid:1
'name': 'mid',
'reg': r'^mid:([^\s]*)',
'format': 'mid:%s'
},
{
// a=msid:0c8b064d-d807-43b4-b434-f92a889d8587 98178685-d409-46e0-8e16-7ef0db0db64a
'name': 'msid',
'reg': r'^msid:(.*)',
'format': 'msid:%s'
},
{
// a=ptime:20
'name': 'ptime',
'reg': r'^ptime:(\d*)',
'format': 'ptime:%d'
},
{
// a=maxptime:60
'name': 'maxptime',
'reg': r'^maxptime:(\d*)',
'format': 'maxptime:%d'
},
{
// a=sendrecv
'name': 'direction',
'reg': r'^(sendrecv|recvonly|sendonly|inactive)'
},
{
// a=ice-lite
'name': 'icelite',
'reg': r'^(ice-lite)'
},
{
// a=ice-ufrag:F7gI
'name': 'iceUfrag',
'reg': r'^ice-ufrag:(\S*)',
'format': 'ice-ufrag:%s'
},
{
// a=ice-pwd:x9cml/YzichV2+XlhiMu8g
'name': 'icePwd',
'reg': r'^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': r'^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':
r'^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': (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;
} as dynamic
},
{
// a=end-of-candidates (keep after the candidates line for readability)
'name': 'endOfCandidates',
'reg': r'^(end-of-candidates)'
},
{
// a=remote-candidates:1 203.0.113.1 54400 2 203.0.113.1 54401 ...
'name': 'remoteCandidates',
'reg': r'^remote-candidates:(.*)',
'format': 'remote-candidates:%s'
},
{
// a=ice-options:google-ice
'name': 'iceOptions',
'reg': r'^ice-options:(\S*)',
'format': 'ice-options:%s'
},
{
// a=ssrc:2566107569 cname:t9YU8M1UxTF8Y1A1
'push': 'ssrcs',
'reg': r'^ssrc:(\d*) ([\w_-]*)(?::(.*))?',
'names': ['id', 'attribute', 'value'],
'format': (o) {
var str = 'ssrc:%d';
if (o['attribute'] != null) {
str += ' %s';
if (o['value'] != null) {
str += ':%s';
}
}
return str;
} as dynamic
},
{
// 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':
r'^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': r'^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': r'^group:(\w*) ?(.*)',
'names': ['type', 'mids'],
'format': 'group:%s %s'
},
{
// a=rtcp-mux
'name': 'rtcpMux',
'reg': r'^(rtcp-mux)'
},
{
// a=rtcp-rsize
'name': 'rtcpRsize',
'reg': r'^(rtcp-rsize)'
},
{
// a=sctpmap:5000 webrtc-datachannel 1024
'name': 'sctpmap',
'reg': r'^sctpmap:([\w_/]*) (\S*)(?: (\S*))?',
'names': ['sctpmapNumber', 'app', 'maxMessageSize'],
'format': (o) {
return (o['maxMessageSize'] != null)
? 'sctpmap:%s %s %s'
: 'sctpmap:%s %s';
} as dynamic
},
{
// a=x-google-flag:conference
'name': 'xGoogleFlag',
'reg': r'^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': r'^rid:([\d\w]+) (\w+)(?: ([\S| ]*))?',
'names': ['id', 'direction', 'params'],
'format': (o) {
return (o['params'] != null) ? 'rid:%s %s %s' : 'rid:%s %s';
} as dynamic
},
{
// 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': (o) {
return 'imageattr:%s %s %s' + (o['dir2'] != null ? ' %s %s' : '');
} as dynamic
},
{
// 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': (o) {
return 'simulcast:%s %s' + (o['dir2'] != null ? ' %s %s' : '');
} as dynamic
},
{
// 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': r'^simulcast:[\s\t]+([\S+\s\t]+)$',
'names': ['value'],
'format': 'simulcast: %s'
},
{
// a=framerate:25
// a=framerate:29.97
'name': 'framerate',
'reg': r'^framerate:(\d+(?:$|\.\d+))',
'format': 'framerate:%s'
},
{
// RFC4570
// a=source-filter: incl IN IP4 239.5.2.31 10.1.15.5
'name': 'sourceFilter',
'reg': r'^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': r'^(bundle-only)'
},
{
// a=label:1
'name': 'label',
'reg': r'^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': r'^sctp-port:(\d+)$',
'format': 'sctp-port:%s'
},
{
// RFC version 26 for SCTP over DTLS
// https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-6
'name': 'maxMessageSize',
'reg': r'^max-message-size:(\d+)$',
'format': 'max-message-size:%s'
},
{
// any a= that we don't understand is kepts verbatim on media.invalid
'push': 'invalid',
'names': ['value']
}
]
};
