How to use the sdp.parseRtpParameters function in sdp

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

function splitSimulcast(sdp) {
    const sections = SDPUtils.splitSections(sdp);
    const candidates = SDPUtils.matchPrefix(sections[1], 'a=candidate:');
    const dtls = SDPUtils.getDtlsParameters(sections[1], sections[0]);
    const ice = SDPUtils.getIceParameters(sections[1], sections[0]);
    const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);

    // unified plan things.
    rtpParameters.headerExtensions = rtpParameters.headerExtensions.filter(ext => {
        return ext.uri !== 'urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id' &&
            ext.uri !== 'urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id' &&
            ext.uri !== 'urn:ietf:params:rtp-hdrext:sdes:mid';
    });
    sdp = 'v=0\r\n' +
      'o=mozilla...THIS_IS_SDPARTA-61.0 8324701712193024513 0 IN IP4 0.0.0.0\r\n' +
      's=-\r\n' +
      't=0 0\r\n' +
      'a=fingerprint:' + dtls.fingerprints[0].algorithm + ' ' + dtls.fingerprints[0].value + '\r\n' +
      'a=ice-ufrag:' + ice.usernameFragment + '\r\n' +
      'a=ice-pwd:' + ice.password + '\r\n' +
      'a=group:BUNDLE 0 1\r\n' +
      'a=msid-semantic:WMS *\r\n';

return;
            }

            var transceiver;
            var iceGatherer;
            var iceTransport;
            var dtlsTransport;
            var rtpSender;
            var rtpReceiver;
            var sendEncodingParameters;
            var recvEncodingParameters;
            var localCapabilities;

            var track;
            // FIXME: ensure the mediaSection has rtcp-mux set.
            var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
            var remoteIceParameters;
            var remoteDtlsParameters;
            if (!rejected) {
              remoteIceParameters = SDPUtils.getIceParameters(mediaSection,
                  sessionpart);
              remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,
                  sessionpart);
              remoteDtlsParameters.role = 'client';
            }
            recvEncodingParameters =
                SDPUtils.parseRtpEncodingParameters(mediaSection);

            var cname;
            // Gets the first SSRC. Note that with RTX there might be multiple
            // SSRCs.
            var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')

return;
            }

            var transceiver;
            var iceGatherer;
            var iceTransport;
            var dtlsTransport;
            var rtpSender;
            var rtpReceiver;
            var sendEncodingParameters;
            var recvEncodingParameters;
            var localCapabilities;

            var track;
            // FIXME: ensure the mediaSection has rtcp-mux set.
            var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
            var remoteIceParameters;
            var remoteDtlsParameters;
            if (!rejected) {
              remoteIceParameters = SDPUtils.getIceParameters(mediaSection,
                  sessionpart);
              remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,
                  sessionpart);
              remoteDtlsParameters.role = 'client';
            }
            recvEncodingParameters =
                SDPUtils.parseRtpEncodingParameters(mediaSection);

            var cname;
            // Gets the first SSRC. Note that with RTX there might be multiple
            // SSRCs.
            var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')

function mergeSimulcast(sdp) {
	const sections = SDPUtils.splitSections(sdp);
    const candidates = SDPUtils.matchPrefix(sections[1], 'a=candidate:');
    const dtls = SDPUtils.getDtlsParameters(sections[1], sections[0]);
    const ice = SDPUtils.getIceParameters(sections[1], sections[0]);
    const rtpParameters = SDPUtils.parseRtpParameters(sections[1]);
    sdp = 'v=0\r\n' +
      'o=mozilla...THIS_IS_SDPARTA-61.0 8324701712193024513 0 IN IP4 0.0.0.0\r\n' +
      's=-\r\n' +
      't=0 0\r\n' +
      'a=fingerprint:' + dtls.fingerprints[0].algorithm + ' ' + dtls.fingerprints[0].value + '\r\n' +
      'a=ice-ufrag:' + ice.usernameFragment + '\r\n' +
      'a=ice-pwd:' + ice.password + '\r\n' +
      'a=group:BUNDLE 0\r\n' +
      'a=msid-semantic:WMS *\r\n';
    const codecs = SDPUtils.writeRtpDescription('video', rtpParameters);
    sdp += codecs;
    candidates.forEach(c => sdp += c + '\r\n');
    return sdp;
}

sections.forEach(function(mediaSection, sdpMLineIndex) {
                var caps = SDPUtils.parseRtpParameters(mediaSection);
                self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
              });
              this.transceivers = this._pendingOffer;

sections.forEach(function(mediaSection, sdpMLineIndex) {
                var caps = SDPUtils.parseRtpParameters(mediaSection);
                self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
              });
              this.transceivers = this._pendingOffer;

sections.forEach(function(mediaSection, sdpMLineIndex) {
                var caps = SDPUtils.parseRtpParameters(mediaSection);
                self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
              });
              this.transceivers = this._pendingOffer;

sections.forEach(function(mediaSection, sdpMLineIndex) {
                var caps = SDPUtils.parseRtpParameters(mediaSection);
                self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
              });
              this.transceivers = this._pendingOffer;

sections.forEach(function(mediaSection, sdpMLineIndex) {
                var caps = SDPUtils.parseRtpParameters(mediaSection);
                self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
              });
              this.transceivers = this._pendingOffer;