How to use the sdp.splitSections function in sdp

window.RTCPeerConnection.prototype._emitBufferedCandidates = function() {
      var self = this;
      var sections = SDPUtils.splitSections(self.localDescription.sdp);
      // FIXME: need to apply ice candidates in a way which is async but
      // in-order
      this._localIceCandidatesBuffer.forEach(function(event) {
        var end = !event.candidate || Object.keys(event.candidate).length === 0;
        if (end) {
          for (var j = 1; j < sections.length; j++) {
            if (sections[j].indexOf('\r\na=end-of-candidates\r\n') === -1) {
              sections[j] += 'a=end-of-candidates\r\n';
            }
          }
        } else if (event.candidate.candidate.indexOf('typ endOfCandidates')
            === -1) {
          sections[event.candidate.sdpMLineIndex + 1] +=
              'a=' + event.candidate.candidate + '\r\n';
        }
        self.localDescription.sdp = sections.join('');

var end = !cand || Object.keys(cand).length === 0;
            // Edge emits an empty object for RTCIceCandidateComplete‥
            if (end) {
              // polyfill since RTCIceGatherer.state is not implemented in
              // Edge 10547 yet.
              if (iceGatherer.state === undefined) {
                iceGatherer.state = 'completed';
              }
            } else {
              // RTCIceCandidate doesn't have a component, needs to be added
              cand.component = iceTransport.component === 'RTCP' ? 2 : 1;
              event.candidate.candidate = SDPUtils.writeCandidate(cand);
            }

            // update local description.
            var sections = SDPUtils.splitSections(self.localDescription.sdp);
            if (!end) {
              sections[event.candidate.sdpMLineIndex + 1] +=
                  'a=' + event.candidate.candidate + '\r\n';
            } else {
              sections[event.candidate.sdpMLineIndex + 1] +=
                  'a=end-of-candidates\r\n';
            }
            self.localDescription.sdp = sections.join('');
            var transceivers = self._pendingOffer ? self._pendingOffer :
                self.transceivers;
            var complete = transceivers.every(function(transceiver) {
              return transceiver.iceGatherer &&
                  transceiver.iceGatherer.state === 'completed';
            });

            // Emit candidate if localDescription is set.

export function transformSdp(sdp, sdpOptions) {
    var sections = splitSections(sdp);
    for (var i = 1; i < sections.length; i++) {
        var mediaType = getKind(sections[i]);
        var rtpParams = parseRtpParameters(sections[i]);
        // a map from payload type (string) to codec object
        var codecMap = rtpParams.codecs.reduce((map, codec) => {
            map['' + codec.payloadType] = codec;
            return map;
        }, {});
        sections[i] = splitLines(sections[i]).map(line => {
            if (line.startsWith('m=')) {
                // modify m= line if SdpOptions#forceCodec specifies codec for current media type
                if (sdpOptions.forceCodec[mediaType]) {
                    var targetCodecPts = Object.keys(codecMap).filter(pt => !sdpOptions._shouldDeleteCodec(mediaType, codecMap[pt].name));
                    return /.*RTP\/S?AVPF? /.exec(line) + targetCodecPts.join(' ');
                } else {
                    return line;

// if (!this._pendingOffer) {
      // } else {
      if (this._pendingOffer) {
        // VERY limited support for SDP munging. Limited to:
        // * changing the order of codecs
        sections = SDPUtils.splitSections(description.sdp);
        sessionpart = sections.shift();
        sections.forEach(function(mediaSection, sdpMLineIndex) {
          var caps = SDPUtils.parseRtpParameters(mediaSection);
          self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
        });
        this.transceivers = this._pendingOffer;
        delete this._pendingOffer;
      }
    } else if (description.type === 'answer') {
      sections = SDPUtils.splitSections(self.remoteDescription.sdp);
      sessionpart = sections.shift();
      var isIceLite = SDPUtils.matchPrefix(sessionpart,
          'a=ice-lite').length > 0;
      sections.forEach(function(mediaSection, sdpMLineIndex) {
        var transceiver = self.transceivers[sdpMLineIndex];
        var iceGatherer = transceiver.iceGatherer;
        var iceTransport = transceiver.iceTransport;
        var dtlsTransport = transceiver.dtlsTransport;
        var localCapabilities = transceiver.localCapabilities;
        var remoteCapabilities = transceiver.remoteCapabilities;

        var rejected = SDPUtils.isRejected(mediaSection);

        if (!rejected && !transceiver.isDatachannel) {
          var remoteIceParameters = SDPUtils.getIceParameters(
              mediaSection, sessionpart);

function replaceSecondStreamId(sdp) {
  var mediaSections = SDPUtils.splitSections(sdp);

  var firstMsid = SDPUtils.matchPrefix(mediaSections[1], 'a=msid:')[0]
      .split(' ')[0].substr(7);
  var secondMsid = SDPUtils.matchPrefix(mediaSections[2], 'a=msid:')[0]
      .split(' ')[0].substr(7);

  return sdp.replace(new RegExp(secondMsid, 'g'), firstMsid);
}

function(description) {
          var self = this;
          var stream = new MediaStream();
          var receiverList = [];
          var sections = SDPUtils.splitSections(description.sdp);
          var sessionpart = sections.shift();
          var isIceLite = SDPUtils.matchPrefix(sessionpart,
              'a=ice-lite').length > 0;
          this.usingBundle = SDPUtils.matchPrefix(sessionpart,
              'a=group:BUNDLE ').length > 0;
          sections.forEach(function(mediaSection, sdpMLineIndex) {
            var lines = SDPUtils.splitLines(mediaSection);
            var mline = lines[0].substr(2).split(' ');
            var kind = mline[0];
            var rejected = mline[1] === '0';
            var direction = SDPUtils.getDirection(mediaSection, sessionpart);

            var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:');
            if (mid.length) {
              mid = mid[0].substr(6);
            } else {

function(description) {
          var self = this;
          var stream = new MediaStream();
          var receiverList = [];
          var sections = SDPUtils.splitSections(description.sdp);
          var sessionpart = sections.shift();
          var isIceLite = SDPUtils.matchPrefix(sessionpart,
              'a=ice-lite').length > 0;
          sections.forEach(function(mediaSection, sdpMLineIndex) {
            var lines = SDPUtils.splitLines(mediaSection);
            var mline = lines[0].substr(2).split(' ');
            var kind = mline[0];
            var rejected = mline[1] === '0';
            var direction = SDPUtils.getDirection(mediaSection, sessionpart);

            var transceiver;
            var iceGatherer;
            var iceTransport;
            var dtlsTransport;
            var rtpSender;
            var rtpReceiver;

function(description) {
          var self = this;
          var stream = new MediaStream();
          var receiverList = [];
          var sections = SDPUtils.splitSections(description.sdp);
          var sessionpart = sections.shift();
          var isIceLite = SDPUtils.matchPrefix(sessionpart,
              'a=ice-lite').length > 0;
          this.usingBundle = SDPUtils.matchPrefix(sessionpart,
              'a=group:BUNDLE ').length > 0;
          sections.forEach(function(mediaSection, sdpMLineIndex) {
            var lines = SDPUtils.splitLines(mediaSection);
            var mline = lines[0].substr(2).split(' ');
            var kind = mline[0];
            var rejected = mline[1] === '0';
            var direction = SDPUtils.getDirection(mediaSection, sessionpart);

            var transceiver;
            var iceGatherer;
            var iceTransport;
            var dtlsTransport;

function parseRtpOptions(inviteResponse: { content: string }): RtpOptions {
  const sections: string[] = sdp.splitSections(inviteResponse.content),
    oLine = sdp.parseOLine(sections[0]),
    rtpOptions = {
      address: oLine.address,
      audio: getRtpDescription(sections, 'audio'),
      video: getRtpDescription(sections, 'video')
    }
  return rtpOptions
}