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qrcode-decoder
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fix: try to use rear camera by default

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pull/23/head
yugasun 3 years ago
parent 8c80e312b3
commit 7d77236fc0
8 changed files with 162 additions and 150 deletions
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2
.gitignore vendored
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@ -9,3 +9,5 @@ tsconfig.tsbuildinfo
coverage
yarn.lock
.rpt2_cache
demo/lib/index.min.js

77
demo/camera.html
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@ -1,45 +1,48 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>QrcodeDecoder - Camera</title>
</head>
<body>
<button id="start">Start</button> <button id="stop">Stop</button><br />
<span id="result">Click start to scan qrcode.</span><br />
<hr />
<video id="video" autoplay></video>
<script src="./lib/vconsole.min.js"></script>
<script src="./index.min.js"></script>
<script type="text/javascript">
var vConsole = new VConsole();
console.log('Hello world');
function main() {
var qr = new QrcodeDecoder();
var video = document.querySelector('#video');
var start = document.querySelector('#start');
var stop = document.querySelector('#stop');
var result = document.querySelector('#result');
async function startScan() {
if (!qr.isCanvasSupported()) {
alert("Your browser doesn't match the required specs.");
throw new Error('Canvas and getUserMedia are required');
}
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>QrcodeDecoder - Camera</title>
</head>
let code = await qr.decodeFromCamera(video);
console.log('code', code);
result.innerText = 'Result: ' + code.data;
<body>
<button id="start">Start</button> <button id="stop">Stop</button><br />
<span id="result">Click start to scan qrcode.</span><br />
<hr />
<video id="video" autoplay></video>
<script src="./lib/vconsole.min.js"></script>
<script src="./lib/index.min.js"></script>
<script type="text/javascript">
var vConsole = new VConsole();
console.log('Hello world');
function main() {
var qr = new QrcodeDecoder();
var video = document.querySelector('#video');
var start = document.querySelector('#start');
var stop = document.querySelector('#stop');
var result = document.querySelector('#result');
async function startScan() {
if (!qr.isCanvasSupported()) {
alert("Your browser doesn't match the required specs.");
throw new Error('Canvas and getUserMedia are required');
}
start.onclick = startScan;
stop.onclick = function() {
qr.stop();
};
let code = await qr.decodeFromCamera(video);
console.log('code', code);
result.innerText = 'Result: ' + code.data;
}
main();
</script>
</body>
start.onclick = startScan;
stop.onclick = function () {
qr.stop();
};
}
main();
</script>
</body>
</html>

116
demo/image.html
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@ -1,64 +1,66 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>QrcodeDecoder - Image</title>
</head>
<body>
<section>
<h3>Same domain image</h3>
<img id="img1" src="./assets/qrcode.png" alt="qr code" /><br />
<button id="decode1">Decode!</button><br />
<span id="result1"></span><br />
</section>
<hr />
<section>
<h3>Different domain image</h3>
<input
id="img2"
value="https://yugasun.com/static/wechat.jpg"
style="width: 400px"
/><br />
<button id="decode2">Decode!</button><br />
<span id="result2"></span><br />
</section>
<script src="./lib/vconsole.min.js"></script>
<script src="./index.min.js"></script>
<script type="module">
var vConsole = new VConsole();
function main() {
var qr = new QrcodeDecoder();
var btn1 = document.querySelector('button#decode1');
var btn2 = document.querySelector('button#decode2');
var result1 = document.querySelector('#result1');
var result2 = document.querySelector('#result2');
var img1 = document.querySelector('#img1');
var img2 = document.querySelector('#img2');
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>QrcodeDecoder - Image</title>
</head>
btn1.onclick = async () => {
// you can also decode from image path
// const code = await qr.decodeFromImage('./assets/qrcode.png');
const code = await qr.decodeFromImage(img1);
console.log(code);
result1.innerText = code.data;
};
<body>
<section>
<h3>Same domain image</h3>
<img id="img1" src="./assets/qrcode.png" alt="qr code" /><br />
<button id="decode1">Decode!</button><br />
<span id="result1"></span><br />
</section>
<hr />
<section>
<h3>Different domain image</h3>
<input
id="img2"
value="https://yugasun.com/static/wechat.jpg"
style="width: 400px" /><br />
<button id="decode2">Decode!</button><br />
<span id="result2"></span><br />
</section>
<script src="./lib/vconsole.min.js"></script>
<script src="./lib/index.min.js"></script>
<script type="module">
var vConsole = new VConsole();
function main() {
var qr = new QrcodeDecoder();
btn2.onclick = async () => {
// you can also decode from image path
// const code = await qr.decodeFromImage('./assets/qrcode.png');
const code = await qr.decodeFromImage(img2.value, {
crossOrigin: 'anonymous',
});
console.log(code);
result2.innerText = code.data;
};
}
window.onload = () => {
main();
var btn1 = document.querySelector('button#decode1');
var btn2 = document.querySelector('button#decode2');
var result1 = document.querySelector('#result1');
var result2 = document.querySelector('#result2');
var img1 = document.querySelector('#img1');
var img2 = document.querySelector('#img2');
btn1.onclick = async () => {
// you can also decode from image path
// const code = await qr.decodeFromImage('./assets/qrcode.png');
const code = await qr.decodeFromImage(img1);
console.log(code);
result1.innerText = code.data;
};
btn2.onclick = async () => {
// you can also decode from image path
// const code = await qr.decodeFromImage('./assets/qrcode.png');
const code = await qr.decodeFromImage(img2.value, {
crossOrigin: 'anonymous',
});
console.log(code);
result2.innerText = code.data;
};
</script>
</body>
}
window.onload = () => {
main();
};
</script>
</body>
</html>

1
demo/index.min.js vendored
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72
demo/video.html
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@ -1,43 +1,45 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>QrcodeDecoder - Video</title>
</head>
<body>
<button id="start">Start</button> <button id="stop">Stop</button><br />
<span id="result">Click start to scan qrcode.</span><br />
<video src="./assets/qrcode-video.mp4"></video>
<script src="./lib/vconsole.min.js"></script>
<script src="./index.min.js"></script>
<script type="text/javascript">
var vConsole = new VConsole();
console.log('Hello world');
function main() {
var video = document.querySelector('video');
var result = document.querySelector('#result');
var start = document.querySelector('#start');
var stop = document.querySelector('#stop');
var qr = new QrcodeDecoder();
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>QrcodeDecoder - Video</title>
</head>
start.onclick = startScan;
<body>
<button id="start">Start</button> <button id="stop">Stop</button><br />
<span id="result">Click start to scan qrcode.</span><br />
stop.onclick = function() {
qr.stop();
video.pause();
};
<video src="./assets/qrcode-video.mp4"></video>
<script src="./lib/vconsole.min.js"></script>
<script src="./lib/index.min.js"></script>
<script type="text/javascript">
var vConsole = new VConsole();
function main() {
var video = document.querySelector('video');
var result = document.querySelector('#result');
var start = document.querySelector('#start');
var stop = document.querySelector('#stop');
var qr = new QrcodeDecoder();
async function startScan() {
video.play();
const code = await qr.decodeFromVideo(video);
console.log('code', code);
result.innerText = 'Result: ' + code.data;
}
start.onclick = startScan;
stop.onclick = function () {
qr.stop();
video.pause();
};
async function startScan() {
video.play();
const code = await qr.decodeFromVideo(video);
console.log('code', code);
result.innerText = 'Result: ' + code.data;
}
main();
</script>
</body>
}
main();
</script>
</body>
</html>

6
package.json
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@ -11,9 +11,10 @@
"prettier:fix": "prettier --write '**/*.{ts,tsx,md}' --config .prettierrc",
"test": "jest",
"codecov": "jest --coverage && codecov",
"copy-file": "cp dist/index.min.js demo/",
"copy-file": "cp dist/index.min.js demo/lib",
"release": "git commit -am $npm_package_version && git tag $npm_package_version && git push && git push --tags",
"pages": "gh-pages -d demo --remote origin"
"pages": "gh-pages -d demo --remote origin",
"demo": "http-server demo -c-1"
},
"husky": {
"hooks": {
@ -56,6 +57,7 @@
"cross-env": "^6.0.3",
"fancy-log": "^1.3.3",
"gh-pages": "^3.1.0",
"http-server": "^14.1.0",
"husky": "^3.0.9",
"jest": "^24.9.0",
"lint-staged": "^9.5.0",

14
scripts/bundle.ts
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@ -20,16 +20,6 @@ const plugins: rollup.Plugin[] = [
commonjs(),
typescript2({
tsconfig: path.join(__dirname, '..', 'tsconfig.json'),
typescript: ts, // ensure we're using the same typescript (3.x) for rollup as for regular builds etc
tsconfigOverride: {
module: 'esnext',
stripInternal: true,
emitDeclarationOnly: false,
composite: false,
declaration: false,
declarationMap: false,
sourceMap: false,
},
}),
];
@ -77,7 +67,7 @@ async function bundleAio() {
uglify({
compress: {
drop_debugger: true,
drop_console: true,
drop_console: false,
},
}),
],
@ -86,7 +76,7 @@ async function bundleAio() {
file: 'dist/index.min.js',
name: 'QrcodeDecoder',
format: 'iife',
sourcemap: false,
sourcemap: true,
});
}

24
src/index.ts
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@ -19,7 +19,8 @@ class QrcodeDecoder {
this.videoElem = null;
this.getUserMediaHandler = null;
this.videoConstraints = {
video: true,
// default use rear camera
video: { facingMode: { exact: 'environment' } },
audio: false,
};
@ -160,10 +161,23 @@ class QrcodeDecoder {
throw new Error("Couldn't get video from camera");
}
let stream: MediaStream;
try {
const stream = await navigator.mediaDevices.getUserMedia(
this.videoConstraints,
);
stream = await navigator.mediaDevices.getUserMedia(this.videoConstraints);
} catch (e) {
if ((e as OverconstrainedError).name === 'OverconstrainedError') {
console.log('[OverconstrainedError] Can not use rear camera.');
stream = await navigator.mediaDevices.getUserMedia({
video: true,
audio: false,
});
} else {
throw e;
}
}
if (stream) {
videoElem.srcObject = stream;
// videoElem.src = window.URL.createObjectURL(stream);
this.videoElem = videoElem;
@ -171,8 +185,6 @@ class QrcodeDecoder {
const code = await this.decodeFromVideo(videoElem, opts);
return code;
} catch (e) {
throw e;
}
}

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