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April 4, 2019 03:41
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Read QR Code from video with web browser using cozmo/jsQR
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| #canvas { | |
| width: 100%; | |
| vertical-align: bottom; | |
| } | |
| body { | |
| max-width: 640px; | |
| margin: 0 auto; | |
| } | |
| </style> | |
| <script src="https://cdn.jsdelivr.net/gh/cozmo/jsQR/dist/jsQR.js"></script> | |
| </head> | |
| <body> | |
| <div id="container"> | |
| <canvas id="canvas" hidden></canvas> | |
| </div> | |
| <hr /> | |
| <button id="on_off">on_off</button> | |
| <div id="output"></div> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| const canvasElement = document.getElementById("canvas"); | |
| const canvas = canvasElement.getContext("2d"); | |
| const output = document.getElementById("output"); | |
| const video = document.createElement("video"); | |
| document.getElementById("on_off").addEventListener("click", main); | |
| async function main() { | |
| if (video.srcObject) { | |
| video.srcObject.getTracks().forEach( t => t.stop()); | |
| video.srcObject = null; | |
| } else { | |
| const stream = await navigator.mediaDevices.getUserMedia({audio:false, video:{ facingMode: "environment"}}); | |
| video.srcObject = stream; | |
| video.setAttribute("playsinline", true); | |
| video.play(); | |
| requestAnimationFrame(tick); | |
| } | |
| } | |
| function tick() { | |
| if (video.readyState == video.HAVE_ENOUGH_DATA){ | |
| canvasElement.hidden = false; | |
| canvasElement.width = video.videoWidth; | |
| canvasElement.height = video.videoHeight; | |
| canvas.drawImage(video, 0, 0, canvasElement.width, canvasElement.height); | |
| var img = canvas.getImageData(0, 0, canvasElement.width, canvasElement.height); | |
| const code = jsQR(img.data, img.width, img.height, {inversionAttemps: "dontInvert"}); | |
| if (code) { | |
| output.innerText = code.data; | |
| main().catch(e => alert(e)); | |
| return; | |
| } | |
| } | |
| requestAnimationFrame(tick); | |
| } |
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cozmo/jsQR