pc_test_fps.html [108:144]:
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  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) {
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pc_test_h264.html [85:121]:
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  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) {
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