68 lines
2.6 KiB
JavaScript
68 lines
2.6 KiB
JavaScript
const e = require('../core/elements');
|
|
const { sleep } = require('../core/helpers');
|
|
const { LOOP_INTERVAL, ELEMENT_WAIT_LONGER_TIME } = require('../core/constants');
|
|
|
|
// loop 5 times, every LOOP_INTERVAL milliseconds, and check that all
|
|
// videos displayed are changing by comparing a hash of their
|
|
// displayed contents
|
|
|
|
async function webcamContentCheck(test) {
|
|
await test.waitForSelector(e.webcamVideoItem);
|
|
await test.wasRemoved(e.webcamConnecting, ELEMENT_WAIT_LONGER_TIME);
|
|
const repeats = 5;
|
|
let check;
|
|
for (let i = repeats; i >= 1; i--) {
|
|
console.log(`loop ${i}`);
|
|
const checkCameras = () => {
|
|
const videos = document.querySelectorAll('video');
|
|
const lastVideoHash = document.lastVideoHash || {};
|
|
document.lastVideoHash = lastVideoHash;
|
|
|
|
// If this code was running in the playwright test harness, we
|
|
// could just require('sha1'), but it's running in the test
|
|
// browser via test.page.evaluate, and I'm not sure how to get a
|
|
// node module (like sha1) into the test browser. So I just
|
|
// found a nice hash function on the Internet. -bwb
|
|
|
|
// public domain code from https://stackoverflow.com/a/52171480/1493790
|
|
// and/or https://github.com/bryc/code/blob/master/jshash/experimental/cyrb53.js
|
|
|
|
const cyrb53 = function(array, seed = 0) {
|
|
let h1 = 0xdeadbeef ^ seed, h2 = 0x41c6ce57 ^ seed;
|
|
for (let i = 0, ch; i < array.length; i++) {
|
|
ch = array[i];
|
|
h1 = Math.imul(h1 ^ ch, 2654435761);
|
|
h2 = Math.imul(h2 ^ ch, 1597334677);
|
|
}
|
|
h1 = Math.imul(h1 ^ (h1>>>16), 2246822507) ^ Math.imul(h2 ^ (h2>>>13), 3266489909);
|
|
h2 = Math.imul(h2 ^ (h2>>>16), 2246822507) ^ Math.imul(h1 ^ (h1>>>13), 3266489909);
|
|
return 4294967296 * (2097151 & h2) + (h1>>>0);
|
|
};
|
|
|
|
for (let v = 0; v < videos.length; v++) {
|
|
const video = videos[v];
|
|
const canvas = document.createElement('canvas');
|
|
const context = canvas.getContext('2d');
|
|
context.drawImage(video, 0, 0, video.videoWidth, video.videoHeight);
|
|
const pixel = context.getImageData(0, 0, video.videoWidth, video.videoHeight).data;
|
|
const pixelHash = cyrb53(pixel);
|
|
|
|
if (lastVideoHash[v]) {
|
|
if (lastVideoHash[v] == pixelHash) {
|
|
return false;
|
|
}
|
|
}
|
|
lastVideoHash[v] = pixelHash;
|
|
}
|
|
return true;
|
|
};
|
|
|
|
check = await test.page.evaluate(checkCameras, i);
|
|
if (!check) return false;
|
|
await sleep(LOOP_INTERVAL);
|
|
}
|
|
return check === true;
|
|
}
|
|
|
|
exports.webcamContentCheck = webcamContentCheck;
|