@twilio/voice-sdk
Version:
Twilio's JavaScript Voice SDK
167 lines (163 loc) • 14.5 kB
JavaScript
;
var util = require('../util.js');
// @ts-nocheck
var ptToFixedBitrateAudioCodecName = {
0: 'PCMU',
8: 'PCMA',
};
var defaultOpusId = 111;
var BITRATE_MAX = 510000;
var BITRATE_MIN = 6000;
function getPreferredCodecInfo(sdp) {
var _a = /a=rtpmap:(\d+) (\S+)/m.exec(sdp) || [null, '', ''], codecId = _a[1], codecName = _a[2];
var regex = new RegExp("a=fmtp:".concat(codecId, " (\\S+)"), 'm');
var _b = regex.exec(sdp) || [null, ''], codecParams = _b[1];
return { codecName: codecName, codecParams: codecParams };
}
function setIceAggressiveNomination(sdp) {
// This only works on Chrome. We don't want any side effects on other browsers
// https://bugs.chromium.org/p/chromium/issues/detail?id=1024096
// https://issues.corp.twilio.com/browse/CLIENT-6911
if (!util.isChrome(window, window.navigator)) {
return sdp;
}
return sdp.split('\n')
.filter(function (line) { return line.indexOf('a=ice-lite') === -1; })
.join('\n');
}
function setMaxAverageBitrate(sdp, maxAverageBitrate) {
if (typeof maxAverageBitrate !== 'number'
|| maxAverageBitrate < BITRATE_MIN
|| maxAverageBitrate > BITRATE_MAX) {
return sdp;
}
var matches = /a=rtpmap:(\d+) opus/m.exec(sdp);
var opusId = matches && matches.length ? matches[1] : defaultOpusId;
var regex = new RegExp("a=fmtp:".concat(opusId));
var lines = sdp.split('\n').map(function (line) { return regex.test(line)
? line + ";maxaveragebitrate=".concat(maxAverageBitrate)
: line; });
return lines.join('\n');
}
/**
* Return a new SDP string with the re-ordered codec preferences.
* @param {string} sdp
* @param {Array<AudioCodec>} preferredCodecs - If empty, the existing order
* of audio codecs is preserved
* @returns {string} Updated SDP string
*/
function setCodecPreferences(sdp, preferredCodecs) {
var mediaSections = getMediaSections(sdp);
var session = sdp.split('\r\nm=')[0];
return [session].concat(mediaSections.map(function (section) {
// Codec preferences should not be applied to m=application sections.
if (!/^m=(audio|video)/.test(section)) {
return section;
}
var kind = section.match(/^m=(audio|video)/)[1];
var codecMap = createCodecMapForMediaSection(section);
var payloadTypes = getReorderedPayloadTypes(codecMap, preferredCodecs);
var newSection = setPayloadTypesInMediaSection(payloadTypes, section);
var pcmaPayloadTypes = codecMap.get('pcma') || [];
var pcmuPayloadTypes = codecMap.get('pcmu') || [];
var fixedBitratePayloadTypes = kind === 'audio'
? new Set(pcmaPayloadTypes.concat(pcmuPayloadTypes))
: new Set();
return fixedBitratePayloadTypes.has(payloadTypes[0])
? newSection.replace(/\r\nb=(AS|TIAS):([0-9]+)/g, '')
: newSection;
})).join('\r\n');
}
/**
* Get the m= sections of a particular kind and direction from an sdp.
* @param {string} sdp - SDP string
* @param {string} [kind] - Pattern for matching kind
* @param {string} [direction] - Pattern for matching direction
* @returns {Array<string>} mediaSections
*/
function getMediaSections(sdp, kind, direction) {
return sdp.replace(/\r\n\r\n$/, '\r\n').split('\r\nm=').slice(1).map(function (mediaSection) { return "m=".concat(mediaSection); }).filter(function (mediaSection) {
var kindPattern = new RegExp("m=".concat('.*'), 'gm');
var directionPattern = new RegExp("a=".concat('.*'), 'gm');
return kindPattern.test(mediaSection) && directionPattern.test(mediaSection);
});
}
/**
* Create a Codec Map for the given m= section.
* @param {string} section - The given m= section
* @returns {Map<Codec, Array<PT>>}
*/
function createCodecMapForMediaSection(section) {
return Array.from(createPtToCodecName(section)).reduce(function (codecMap, pair) {
var pt = pair[0];
var codecName = pair[1];
var pts = codecMap.get(codecName) || [];
return codecMap.set(codecName, pts.concat(pt));
}, new Map());
}
/**
* Create the reordered Codec Payload Types based on the preferred Codec Names.
* @param {Map<Codec, Array<PT>>} codecMap - Codec Map
* @param {Array<Codec>} preferredCodecs - Preferred Codec Names
* @returns {Array<PT>} Reordered Payload Types
*/
function getReorderedPayloadTypes(codecMap, preferredCodecs) {
preferredCodecs = preferredCodecs.map(function (codecName) { return codecName.toLowerCase(); });
var preferredPayloadTypes = util.flatMap(preferredCodecs, function (codecName) { return codecMap.get(codecName) || []; });
var remainingCodecs = util.difference(Array.from(codecMap.keys()), preferredCodecs);
var remainingPayloadTypes = util.flatMap(remainingCodecs, function (codecName) { return codecMap.get(codecName); });
return preferredPayloadTypes.concat(remainingPayloadTypes);
}
/**
* Set the given Codec Payload Types in the first line of the given m= section.
* @param {Array<PT>} payloadTypes - Payload Types
* @param {string} section - Given m= section
* @returns {string} - Updated m= section
*/
function setPayloadTypesInMediaSection(payloadTypes, section) {
var lines = section.split('\r\n');
var mLine = lines[0];
var otherLines = lines.slice(1);
mLine = mLine.replace(/([0-9]+\s?)+$/, payloadTypes.join(' '));
return [mLine].concat(otherLines).join('\r\n');
}
/**
* Create a Map from PTs to codec names for the given m= section.
* @param {string} mediaSection - The given m= section.
* @returns {Map<PT, Codec>} ptToCodecName
*/
function createPtToCodecName(mediaSection) {
return getPayloadTypesInMediaSection(mediaSection).reduce(function (ptToCodecName, pt) {
var rtpmapPattern = new RegExp("a=rtpmap:".concat(pt, " ([^/]+)"));
var matches = mediaSection.match(rtpmapPattern);
var codecName = matches
? matches[1].toLowerCase()
: ptToFixedBitrateAudioCodecName[pt]
? ptToFixedBitrateAudioCodecName[pt].toLowerCase()
: '';
return ptToCodecName.set(pt, codecName);
}, new Map());
}
/**
* Get the Codec Payload Types present in the first line of the given m= section
* @param {string} section - The m= section
* @returns {Array<PT>} Payload Types
*/
function getPayloadTypesInMediaSection(section) {
var mLine = section.split('\r\n')[0];
// In "m=<kind> <port> <proto> <payload_type_1> <payload_type_2> ... <payload_type_n>",
// the regex matches <port> and the PayloadTypes.
var matches = mLine.match(/([0-9]+)/g);
// This should not happen, but in case there are no PayloadTypes in
// the m= line, return an empty array.
if (!matches) {
return [];
}
// Since only the PayloadTypes are needed, we discard the <port>.
return matches.slice(1).map(function (match) { return parseInt(match, 10); });
}
exports.getPreferredCodecInfo = getPreferredCodecInfo;
exports.setCodecPreferences = setCodecPreferences;
exports.setIceAggressiveNomination = setIceAggressiveNomination;
exports.setMaxAverageBitrate = setMaxAverageBitrate;
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