How to use the sdp.splitLines function in sdp

.then(answerWithCandidates => {
    t.pass('answer ready to signal');

    // this was fixed into Chrome 51 with https://bugs.chromium.org/p/chromium/issues/detail?id=591971
    if (answerWithCandidates.sdp.indexOf('a=rtpmap:126 H264') !== -1 &&
        answerWithCandidates.sdp.indexOf('a=fmtp:126') === -1) {
      var sections = SDPUtils.splitSections(answerWithCandidates.sdp);
      var lines = SDPUtils.splitLines(sections[2]);
      var idx = lines.indexOf('a=rtpmap:126 H264/90000');
      lines.splice(idx + 1, 0, 'a=fmtp:126 profile-level-id=42e01f;level-asymmetry-allowed=1;packetization-mode=1');
      sections[2] = lines.join('\r\n');
      answerWithCandidates.sdp = sections.join('') + '\r\n';
    }

    if (preferredVideoCodec) {
      var sections = SDPUtils.splitSections(answerWithCandidates.sdp);
      var codecs = SDPUtils.parseRtpParameters(sections[2]).codecs;
      t.ok(codecs[0].name === preferredVideoCodec, 'preferredVideoCodec is used');
    }

    return clientA.setRemoteDescription(answerWithCandidates);
  })
  .then(() => // wait for the iceConnectionState to become either connected/completed

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 {
              mid = SDPUtils.generateIdentifier();
            }

            // Reject datachannels which are not implemented yet.
            if (kind === 'application' && mline[2] === 'DTLS/SCTP') {
              self.transceivers[sdpMLineIndex] = {
                mid: mid,

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 {
              mid = SDPUtils.generateIdentifier();
            }

            // Reject datachannels which are not implemented yet.
            if (kind === 'application' && mline[2] === 'DTLS/SCTP') {
              self.transceivers[sdpMLineIndex] = {
                mid: mid,

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 {
              mid = SDPUtils.generateIdentifier();
            }

            // Reject datachannels which are not implemented yet.
            if (kind === 'application' && mline[2] === 'DTLS/SCTP') {
              self.transceivers[sdpMLineIndex] = {
                mid: mid,

sections.forEach(function(mediaSection, sdpMLineIndex) {
      var lines = SDPUtils.splitLines(mediaSection);
      var kind = SDPUtils.getKind(mediaSection);
      var rejected = SDPUtils.isRejected(mediaSection);
      var protocol = lines[0].substr(2).split(' ')[2];

      var direction = SDPUtils.getDirection(mediaSection, sessionpart);
      var remoteMsid = SDPUtils.parseMsid(mediaSection);

      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();

      // Reject datachannels which are not implemented yet.
      if (kind === 'application' && protocol === 'DTLS/SCTP') {
        self.transceivers[sdpMLineIndex] = {
          mid: mid,
          isDatachannel: true
        };
        return;

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 remoteMsid = SDPUtils.parseMsid(mediaSection);

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

      // Reject datachannels which are not implemented yet.
      if (kind === 'application' && mline[2] === 'DTLS/SCTP') {
        self.transceivers[sdpMLineIndex] = {

sections.forEach(function(mediaSection, sdpMLineIndex) {
      var lines = SDPUtils.splitLines(mediaSection);
      var kind = SDPUtils.getKind(mediaSection);
      var rejected = SDPUtils.isRejected(mediaSection);
      var protocol = lines[0].substr(2).split(' ')[2];

      var direction = SDPUtils.getDirection(mediaSection, sessionpart);
      var remoteMsid = SDPUtils.parseMsid(mediaSection);

      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();

      // Reject datachannels which are not implemented yet.
      if (kind === 'application' && protocol === 'DTLS/SCTP') {
        self.transceivers[sdpMLineIndex] = {
          mid: mid,
          isDatachannel: true
        };
        return;

sections.forEach(function(mediaSection, sdpMLineIndex) {
      var lines = SDPUtils.splitLines(mediaSection);
      var kind = SDPUtils.getKind(mediaSection);
      var rejected = SDPUtils.isRejected(mediaSection);
      var protocol = lines[0].substr(2).split(' ')[2];

      var direction = SDPUtils.getDirection(mediaSection, sessionpart);
      var remoteMsid = SDPUtils.parseMsid(mediaSection);

      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();

      // Reject datachannels which are not implemented yet.
      if (kind === 'application' && protocol === 'DTLS/SCTP') {
        self.transceivers[sdpMLineIndex] = {
          mid: mid,
          isDatachannel: true
        };
        return;

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 {
              mid = SDPUtils.generateIdentifier();
            }

            // Reject datachannels which are not implemented yet.
            if (kind === 'application' && mline[2] === 'DTLS/SCTP') {
              self.transceivers[sdpMLineIndex] = {
                mid: mid,

function getRtpDescription(
  sections: string[],
  mediaType: 'audio' | 'video'
): RtpStreamOptions {
  const section = sections.find(s => s.startsWith('m=' + mediaType)),
    { port } = sdp.parseMLine(section),
    lines = sdp.splitLines(section),
    cryptoLine = lines.find((l: string) => l.startsWith('a=crypto'))

  if (!cryptoLine) {
    return { port }
  }
  const encodedCrypto = cryptoLine.match(/inline:(\S*)/)[1],
    crypto = Buffer.from(encodedCrypto, 'base64')

  return {
    port,
    srtpKey: crypto.slice(0, 16),
    srtpSalt: crypto.slice(16, 30)
  }
}