pc_forward.html [88:228]:
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  let button = document.getElementById("tehbutton");
  let localvideo1 = document.getElementById("localvideo1");
  let localvideo2 = document.getElementById("localvideo2");
  let fake = document.getElementById("fake");
  fake.checked = true;
  let oneway = document.getElementById("oneway");
  oneway.checked = false;
  let audio_only = document.getElementById("audio_only");
  audio_only.checked = false;
  let video_disable = document.getElementById("disable_video");
  let audio_disable = document.getElementById("disable_audio");
  let requireh264 = document.getElementById("requireh264");
  requireh264.checked = false;
  let prefermode0 = document.getElementById("prefermode0");
  prefermode0.checked = false;
  let requireg722 = document.getElementById("requireg722");
  requireg722.checked = false;

  let pc1;
  let pc2;

  let pc1_offer;
  let pc2_answer;

  let offer_constraints;
  let answer_constraints;

  function disable_media(pc, type, array_index) {
    log("disable_media");
    var stream;
    if (pc == pc1)
      stream = localvideo1.mozSrcObject;
    else if (pc == pc2)
      stream = localvideo2.mozSrcObject;
    else log("bad pc " + pc);

    if (stream) {
      log("track[" + array_index + "] = " + stream.getVideoTracks()[array_index]);
      if (type == 1)
        stream.getVideoTracks()[array_index].enabled = !video_disable.checked;
      else if (type == 0)
        stream.getAudioTracks()[array_index].enabled = !audio_disable.checked;
      else
        log("bad type");
    }
    else
      log("no stream");
  }

  function failed(code) {
    log("Failure callback: " + JSON.stringify(code));
  }

  // pc1.createOffer finished, call pc1.setLocal
  function step1(offer) {
    log("Offer:  " + sdpPrettyPrint(offer.sdp));
    pc1_offer = offer;

    if (requireh264.checked) {
      // to enforce the usage of H264 we remove the VP8 codec from the offer
      offer.sdp = removeVP8(offer.sdp);
      if (prefermode0.checked) {
        offer.sdp = preferMode0(offer.sdp);
      }
      pc1_offer = offer;
      log("No VP8 Offer: " + sdpPrettyPrint(offer.sdp));

      if (!offer.sdp.match(/a=rtpmap:[0-9]+ H264/g)) {
        log("No H264 found in the offer!!!");
        return;
      }
    }
    if (requireg722.checked) {
      // to enforce the usage of G.722 we remove other codecs from the offer
      offer.sdp = removeNonG722(offer.sdp);
      pc1_offer = offer;
      log("G.722 only Offer: " + sdpPrettyPrint(offer.sdp));

      if (!offer.sdp.match(/a=rtpmap:[0-9]+ G722/g)) {
        log("No G722 found in the offer!!!");
        return;
      }
    }
    pc1.setLocalDescription(offer, step2, failed);
  }

  // replace CR NL with HTML breaks
  function sdpPrettyPrint(sdp) {
    return sdp.replace(/[\r\n]+/g, '<br>');
  }

  function h264StateChange(cb)
  {
    var h264opts = document.getElementById('divH264'); 
    if(cb.checked){
      h264opts.style.display = 'block'; 
    } else {
      h264opts.style.display = 'none';
    }
  }

  // Also remove mode 0 if it's offered
  // Note, we don't bother removing the fmtp lines, which makes a good test
  // for some SDP parsing issues.
  function removeVP8(sdp) {
    updated_sdp = sdp.replace("a=rtpmap:120 VP8/90000\r\n","");
    updated_sdp = updated_sdp.replace(/m=video ([0-9]+) RTP\/SAVPF ([0-9 ]*) 120/g, "m=video $1 RTP\/SAVPF $2");
    updated_sdp = updated_sdp.replace(/m=video ([0-9]+) RTP\/SAVPF 120([0-9 ]*)/g, "m=video $1 RTP\/SAVPF$2");
    updated_sdp = updated_sdp.replace("a=rtcp-fb:120 nack\r\n","");
    updated_sdp = updated_sdp.replace("a=rtcp-fb:120 nack pli\r\n","");
    updated_sdp = updated_sdp.replace("a=rtcp-fb:120 ccm fir\r\n","");
    return updated_sdp;
  }

  // Remove anything that's not G.722 from the m=audio line
  function removeNonG722(sdp) {
    updated_sdp = sdp.replace(/m=audio ([0-9]+) RTP\/SAVPF ([0-9 ]*)/g, "m=audio $1 RTP\/SAVPF 9");
    return updated_sdp;
  }

  function preferMode0(sdp) {
    updated_sdp = updated_sdp.replace("126 97", "97 126");
    return updated_sdp;
  }

  // pc1.setLocal finished, call pc2.setRemote
  function step2() {
    pc1.onicecandidate = function(obj) {
      if (obj.candidate) {
        log("pc1 found ICE candidate: " + JSON.stringify(obj.candidate));
        pc2.addIceCandidate(obj.candidate);
      } else {
        log("pc1 got end-of-candidates signal");
      }
    }

    pc2.setRemoteDescription(pc1_offer, step3, failed);
  };

  // pc2.setRemote finished, call pc2.createAnswer
  function step3() {
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pc_test_fps.html [90:230]:
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  let button = document.getElementById("tehbutton");
  let localvideo1 = document.getElementById("localvideo1");
  let localvideo2 = document.getElementById("localvideo2");
  let fake = document.getElementById("fake");
  fake.checked = true;
  let oneway = document.getElementById("oneway");
  oneway.checked = false;
  let audio_only = document.getElementById("audio_only");
  audio_only.checked = false;
  let video_disable = document.getElementById("disable_video");
  let audio_disable = document.getElementById("disable_audio");
  let requireh264 = document.getElementById("requireh264");
  requireh264.checked = false;
  let prefermode0 = document.getElementById("prefermode0");
  prefermode0.checked = false;
  let requireg722 = document.getElementById("requireg722");
  requireg722.checked = false;

  let pc1;
  let pc2;

  let pc1_offer;
  let pc2_answer;

  let offer_constraints;
  let answer_constraints;

  function disable_media(pc, type, array_index) {
    log("disable_media");
    var stream;
    if (pc == pc1)
      stream = localvideo1.mozSrcObject;
    else if (pc == pc2)
      stream = localvideo2.mozSrcObject;
    else log("bad pc " + pc);

    if (stream) {
      log("track[" + array_index + "] = " + stream.getVideoTracks()[array_index]);
      if (type == 1)
        stream.getVideoTracks()[array_index].enabled = !video_disable.checked;
      else if (type == 0)
        stream.getAudioTracks()[array_index].enabled = !audio_disable.checked;
      else
        log("bad type");
    }
    else
      log("no stream");
  }

  function failed(code) {
    log("Failure callback: " + JSON.stringify(code));
  }

  // pc1.createOffer finished, call pc1.setLocal
  function step1(offer) {
    log("Offer:  " + sdpPrettyPrint(offer.sdp));
    pc1_offer = offer;

    if (requireh264.checked) {
      // to enforce the usage of H264 we remove the VP8 codec from the offer
      offer.sdp = removeVP8(offer.sdp);
      if (prefermode0.checked) {
        offer.sdp = preferMode0(offer.sdp);
      }
      pc1_offer = offer;
      log("No VP8 Offer: " + sdpPrettyPrint(offer.sdp));

      if (!offer.sdp.match(/a=rtpmap:[0-9]+ H264/g)) {
        log("No H264 found in the offer!!!");
        return;
      }
    }
    if (requireg722.checked) {
      // to enforce the usage of G.722 we remove other codecs from the offer
      offer.sdp = removeNonG722(offer.sdp);
      pc1_offer = offer;
      log("G.722 only Offer: " + sdpPrettyPrint(offer.sdp));

      if (!offer.sdp.match(/a=rtpmap:[0-9]+ G722/g)) {
        log("No G722 found in the offer!!!");
        return;
      }
    }
    pc1.setLocalDescription(offer, step2, failed);
  }

  // replace CR NL with HTML breaks
  function sdpPrettyPrint(sdp) {
    return sdp.replace(/[\r\n]+/g, '<br>');
  }

  function h264StateChange(cb)
  {
    var h264opts = document.getElementById('divH264'); 
    if(cb.checked){
      h264opts.style.display = 'block'; 
    } else {
      h264opts.style.display = 'none';
    }
  }

  // Also remove mode 0 if it's offered
  // Note, we don't bother removing the fmtp lines, which makes a good test
  // for some SDP parsing issues.
  function removeVP8(sdp) {
    updated_sdp = sdp.replace("a=rtpmap:120 VP8/90000\r\n","");
    updated_sdp = updated_sdp.replace(/m=video ([0-9]+) RTP\/SAVPF ([0-9 ]*) 120/g, "m=video $1 RTP\/SAVPF $2");
    updated_sdp = updated_sdp.replace(/m=video ([0-9]+) RTP\/SAVPF 120([0-9 ]*)/g, "m=video $1 RTP\/SAVPF$2");
    updated_sdp = updated_sdp.replace("a=rtcp-fb:120 nack\r\n","");
    updated_sdp = updated_sdp.replace("a=rtcp-fb:120 nack pli\r\n","");
    updated_sdp = updated_sdp.replace("a=rtcp-fb:120 ccm fir\r\n","");
    return updated_sdp;
  }

  // Remove anything that's not G.722 from the m=audio line
  function removeNonG722(sdp) {
    updated_sdp = sdp.replace(/m=audio ([0-9]+) RTP\/SAVPF ([0-9 ]*)/g, "m=audio $1 RTP\/SAVPF 9");
    return updated_sdp;
  }

  function preferMode0(sdp) {
    updated_sdp = updated_sdp.replace("126 97", "97 126");
    return updated_sdp;
  }

  // pc1.setLocal finished, call pc2.setRemote
  function step2() {
    pc1.onicecandidate = function(obj) {
      if (obj.candidate) {
        log("pc1 found ICE candidate: " + JSON.stringify(obj.candidate));
        pc2.addIceCandidate(obj.candidate);
      } else {
        log("pc1 got end-of-candidates signal");
      }
    }

    pc2.setRemoteDescription(pc1_offer, step3, failed);
  };

  // pc2.setRemote finished, call pc2.createAnswer
  function step3() {
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