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4-ImageCapture.html
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4-ImageCapture.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ImageCapture.takePhoto method</title>
</head>
<body>
<span class="error"></span>
<br>
<label for="interval">Time between images in seconds: </label>
<input id="interval" type="text" value="1" min="1" pattern="\d+">
<br>
<button id="start">Start</button>
<br>
<label for="hideVid">Hide video element: </label>
<input id="hideVid" type="checkbox">
<br>
<p>Camera Settings</p>
<span id="settings"></span>
<p>Camera capabilities</p>
<span id="caps"></span>
<br>
<video autoplay muted playsinline></video>
<p>
Images captured: <span id="image_count">0</span>
</p>
<br>
<button id="stop" disabled>Stop & Show Images</button>
<div id="images"></div>
<script>
// check for support
if(typeof ImageCapture === 'undefined'){
const supportError = "ImageCapture is not supported by your browser";
const errorSpan = document.querySelector('span.error');
errorSpan.style = "color:red;font-size:larger;font-weight:bold";
errorSpan.innerText = supportError;
console.error(supportError);
}
const startBtn = document.querySelector('button#start');
const stopBtn = document.querySelector('button#stop');
const hideVid = document.querySelector('input#hideVid')
const intervalSec = document.querySelector('input#interval');
const videoElem = document.querySelector('video');
const imageCountSpan = document.querySelector('span#image_count');
const settingsSpan = document.querySelector('span#settings');
const capsSpan = document.querySelector('span#caps');
const imagesDiv = document.querySelector('div#images');
const storage = []; // Use this array as our database
let stream, captureInterval;
hideVid.onclick = () => videoElem.hidden = hideVid.checked;
startBtn.onclick = async () => {
startBtn.disabled = true;
stream = await navigator.mediaDevices.getUserMedia({video: true});
videoElem.onplaying = () => console.log("video playing stream:", videoElem.srcObject);
videoElem.srcObject = stream;
const [track] = stream.getVideoTracks();
const imageCapture = new ImageCapture(track);
const photoCapabilities = await imageCapture.getPhotoCapabilities();
capsSpan.innerText = JSON.stringify(photoCapabilities);
console.log("Photo Capabilities: ", photoCapabilities);
const photoSettings = await imageCapture.getPhotoSettings();
settingsSpan.innerText = JSON.stringify(photoSettings);
console.log("Photo settings: ", photoSettings);
// (data check on the interval value) * that value is in seconds * frame timestamps are in microseconds
const interval = (parseInt(intervalSec.value) >= 1 ? intervalSec.value * 1 : 1) * 1000;
captureInterval = setInterval(async () => {
const blob = await imageCapture.takePhoto()
.catch(err => console.error(err)); // It took a few seconds for me the camera to get ready
if(blob){
console.log(blob);
storage.push(blob);
imageCountSpan.innerText++;
}
}, interval);
stopBtn.disabled = false;
}
stopBtn.onclick = () => {
// stop capture
clearInterval(captureInterval);
// close the camera
stream.getTracks().forEach(track => track.stop());
// Display each image
function showImages() {
const blob = storage.shift();
const imageUrl = URL.createObjectURL(blob);
const imgElem = new Image();
imgElem.src = imageUrl;
imagesDiv.appendChild(imgElem);
if (storage.length > 0)
showImages();
}
console.log("stored images");
showImages();
}
</script>
</body>
</html>