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function onLoad(b){for(var x=0;x<z.length;++x)z[x].removeEventListener("load",onLoad,false)
a(b.target)}for(var y=0;y<z.length;++y)z[y].addEventListener("load",onLoad,false)})(function(a){init.currentScript=a
if(typeof dartMainRunner==="function")dartMainRunner(function(b){H.dr(X.dm(),b)},[])
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var TopCodes = {


  startStopVideoScan : function(canvasId) {
    TopCodes._mediaStreams[canvasId] ? 
      TopCodes.stopVideoScan(canvasId) : 
      TopCodes.startVideoScan(canvasId);
  },


  startVideoScan : function(canvasId) {
    // initialize the video scanner if necessary
    if (!(canvasId in TopCodes._mediaStreams)) {
      topcodes_initVideoScanner(canvasId);
    }
    var canvas = document.querySelector("#" + canvasId);
    var video = document.querySelector("#" + canvasId + "-video");
    if (canvas && video) {
      var vw = parseInt(canvas.getAttribute('width'));
      var vh = parseInt(canvas.getAttribute('height'));
      var vc = { audio: false, video: { mandatory : { minWidth: vw, maxWidth : vw, minHeight : vh, maxHeight : vh }}}; 
      navigator.mediaDevices.getUserMedia(vc)
        .then(function(mediaStream) {
          video.srcObject = mediaStream;
          TopCodes._mediaStreams[canvasId] = mediaStream;
        })
        .catch(function (error) {
          console.log(error);
        });
    }
  },


  stopVideoScan : function(canvasId) {
    var video = document.querySelector("#" + canvasId + "-video");
    var mediaStream = TopCodes._mediaStreams[canvasId];
    if (video && mediaStream) {
      mediaStream.getTracks().forEach(function (track) { track.stop(); })
      TopCodes._mediaStreams[canvasId] = null;
      video.pause();
    }
  },


  setVideoFrameCallback : function(canvasId, callback) {
    TopCodes._callbacks[canvasId] = callback;
  },


  _relayFrameData : function(canvasId, json) {
    if (canvasId in TopCodes._callbacks) {
      TopCodes._callbacks[canvasId](json);
    }
  },


  _mediaStreams : { },
  _callbacks : { }
}