html5-qrcode.min.js

! function ($) {
	jQuery.fn.extend({
		html5_qrcode: function (qrcodeSuccess, qrcodeError, videoError) {
			return this.each(function () {
				var currentElem = $(this),
					height = currentElem.height(),
					width = currentElem.width();
				null == height && (height = 250), null == width && (width = 300);
				var localMediaStream, vidElem = $('<video loop muted autoplay width="' + width + 'px" height="' + height + 'px"></video>').appendTo(currentElem),
					canvasElem = $('<canvas id="qr-canvas" width="' + (width - 2) + 'px" height="' + (height - 2) + 'px" style="display:none;"></canvas>').appendTo(currentElem),
					video = vidElem[0],
					canvas = canvasElem[0],
					context = canvas.getContext("2d"),
					scan = function () {
						if (localMediaStream) {
							context.drawImage(video, 0, 0, 307, 250);
							try {
								qrcode.decode()
							} catch (e) {
								qrcodeError(e, localMediaStream)
							}
							$.data(currentElem[0], "timeout", setTimeout(scan, 500))
						} else $.data(currentElem[0], "timeout", setTimeout(scan, 500))
					};
				window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL, navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
				var successCallback = function (stream) {
					video.src = window.URL && window.URL.createObjectURL(stream) || stream, localMediaStream = stream, $.data(currentElem[0], "stream", stream), video.play(), $.data(currentElem[0], "timeout", setTimeout(scan, 1e3))
				};
				navigator.getUserMedia ? navigator.getUserMedia({
					video: !0
				}, successCallback, function (error) {
					videoError(error, localMediaStream)
				}) : console.log("Native web camera streaming (getUserMedia) not supported in this browser."), qrcode.callback = function (result) {
					qrcodeSuccess(result, localMediaStream)
				}
			})
		},
		html5_qrcode_stop: function () {
			return this.each(function () {
				$(this).data("stream").getVideoTracks().forEach(function (videoTrack) {
					videoTrack.stop()
				}), clearTimeout($(this).data("timeout"))
			})
		}
	})
}(jQuery);