audio.html [31:146]:
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<br style="clear: left;" />
</div>
<div id="log"></div>


<script type="application/javascript">
  function log(msg) {
    let div = document.getElementById("log");
    div.innerHTML = div.innerHTML + "<p>" + msg + "</p>";
  }

  let pc1video = document.getElementById("pc1video");
  let pc2video = document.getElementById("pc2video");

  let button = document.getElementById("tehbutton");
  let localvideo1 = document.getElementById("localvideo1");
  let localvideo2 = document.getElementById("localvideo2");
  let fake = document.getElementById("fake");
  fake.checked = true;
  let video_disable = document.getElementById("disable_video");
  let audio_disable = document.getElementById("disable_audio");

  let pc1;
  let pc2;

  let pc1_offer;
  let pc2_answer;

  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: " + code);
  }

  // pc1.createOffer finished, call pc1.setLocal
  function step1(offer) {
    log("Offer:  " + offer.sdp);
    pc1_offer = offer;
    pc1.setLocalDescription(offer, step2, failed);
  }

  // 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() {
    pc2.createAnswer(step4, failed);
  }

  // pc2.createAnswer finished, call pc2.setLocal
  function step4(answer) {
    pc2_answer = answer;
    pc2.setLocalDescription(answer, step5, failed);
  }

  // pc2.setLocal finished, call pc1.setRemote
  function step5() {
    pc2.onicecandidate = function(obj) {
      if (obj.candidate) {
        log("pc2 found ICE candidate: " + JSON.stringify(obj.candidate));
        pc1.addIceCandidate(obj.candidate);
      } else {
        log("pc2 got end-of-candidates signal");
      }
    }

    pc1.setRemoteDescription(pc2_answer, step6, failed);
  }

  // pc1.setRemote finished, media should be running!
  function step6() {
    log("HIP HIP HOORAY");
  }

  function start() {
    button.innerHTML = "Stop!";
    button.onclick = stop;

    pc1 = new RTCPeerConnection();
    pc2 = new RTCPeerConnection();

    pc1.onaddstream = function(obj) {
      log("pc1 got remote stream from pc2 " + obj.type);
      pc1video.mozSrcObject = obj.stream;
      pc1video.play();
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muting.html [57:172]:
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<br style="clear: left;" />
</div>
<div id="log"></div>


<script type="application/javascript">
  function log(msg) {
    let div = document.getElementById("log");
    div.innerHTML = div.innerHTML + "<p>" + msg + "</p>";
  }

  let pc1video = document.getElementById("pc1video");
  let pc2video = document.getElementById("pc2video");

  let button = document.getElementById("tehbutton");
  let localvideo1 = document.getElementById("localvideo1");
  let localvideo2 = document.getElementById("localvideo2");
  let fake = document.getElementById("fake");
  fake.checked = true;
  let video_disable = document.getElementById("disable_video");
  let audio_disable = document.getElementById("disable_audio");

  let pc1;
  let pc2;

  let pc1_offer;
  let pc2_answer;

  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: " + code);
  }

  // pc1.createOffer finished, call pc1.setLocal
  function step1(offer) {
    log("Offer:  " + offer.sdp);
    pc1_offer = offer;
    pc1.setLocalDescription(offer, step2, failed);
  }

  // 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() {
    pc2.createAnswer(step4, failed);
  }

  // pc2.createAnswer finished, call pc2.setLocal
  function step4(answer) {
    pc2_answer = answer;
    pc2.setLocalDescription(answer, step5, failed);
  }

  // pc2.setLocal finished, call pc1.setRemote
  function step5() {
    pc2.onicecandidate = function(obj) {
      if (obj.candidate) {
        log("pc2 found ICE candidate: " + JSON.stringify(obj.candidate));
        pc1.addIceCandidate(obj.candidate);
      } else {
        log("pc2 got end-of-candidates signal");
      }
    }

    pc1.setRemoteDescription(pc2_answer, step6, failed);
  }

  // pc1.setRemote finished, media should be running!
  function step6() {
    log("HIP HIP HOORAY");
  }

  function start() {
    button.innerHTML = "Stop!";
    button.onclick = stop;

    pc1 = new RTCPeerConnection();
    pc2 = new RTCPeerConnection();

    pc1.onaddstream = function(obj) {
      log("pc1 got remote stream from pc2 " + obj.type);
      pc1video.mozSrcObject = obj.stream;
      pc1video.play();
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