prof3ssorSt3v3/user-media.html

## user-media.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>MediaCapture and Streams API</title>
    <meta name="viewport" content="width=device-width">
    <link rel="stylesheet" href="main.css">
</head>
<body>
    <header>
        <h1>MediaCapture, MediaRecorder and Streams API</h1>
    </header>
    <main>
        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit molestiae itaque facere totam saepe tempore esse temporibus, quae reprehenderit aliquid iusto ea laborum, iure eligendi odio exercitationem sapiente illum quos.</p>

        <p><button id="btnStart">START RECORDING</button><br/>
        <button id="btnStop">STOP RECORDING</button></p>

        <video controls></video>

        <video id="vid2" controls></video>

        <!-- could save to canvas and do image manipulation and saving too -->
    </main>
    <script>

        let constraintObj = {
            audio: false,
            video: {
                facingMode: "user",
                width: { min: 640, ideal: 1280, max: 1920 },
                height: { min: 480, ideal: 720, max: 1080 }
            }
        };
        // width: 1280, height: 720  -- preference only
        // facingMode: {exact: "user"}
        // facingMode: "environment"

        //handle older browsers that might implement getUserMedia in some way
        if (navigator.mediaDevices === undefined) {
            navigator.mediaDevices = {};
            navigator.mediaDevices.getUserMedia = function(constraintObj) {
                let getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
                if (!getUserMedia) {
                    return Promise.reject(new Error('getUserMedia is not implemented in this browser'));
                }
                return new Promise(function(resolve, reject) {
                    getUserMedia.call(navigator, constraintObj, resolve, reject);
                });
            }
        }else{
            navigator.mediaDevices.enumerateDevices()
            .then(devices => {
                devices.forEach(device=>{
                    console.log(device.kind.toUpperCase(), device.label);
                    //, device.deviceId
                })
            })
            .catch(err=>{
                console.log(err.name, err.message);
            })
        }

        navigator.mediaDevices.getUserMedia(constraintObj)
        .then(function(mediaStreamObj) {
            //connect the media stream to the first video element
            let video = document.querySelector('video');
            if ("srcObject" in video) {
                video.srcObject = mediaStreamObj;
            } else {
                //old version
                video.src = window.URL.createObjectURL(mediaStreamObj);
            }

            video.onloadedmetadata = function(ev) {
                //show in the video element what is being captured by the webcam
                video.play();
            };

            //add listeners for saving video/audio
            let start = document.getElementById('btnStart');
            let stop = document.getElementById('btnStop');
            let vidSave = document.getElementById('vid2');
            let mediaRecorder = new MediaRecorder(mediaStreamObj);
            let chunks = [];

            start.addEventListener('click', (ev)=>{
                mediaRecorder.start();
                console.log(mediaRecorder.state);
            })
            stop.addEventListener('click', (ev)=>{
                mediaRecorder.stop();
                console.log(mediaRecorder.state);
            });
            mediaRecorder.ondataavailable = function(ev) {
                chunks.push(ev.data);
            }
            mediaRecorder.onstop = (ev)=>{
                let blob = new Blob(chunks, { 'type' : 'video/mp4;' });
                chunks = [];
                let videoURL = window.URL.createObjectURL(blob);
                vidSave.src = videoURL;
            }
        })
        .catch(function(err) {
            console.log(err.name, err.message);
        });

        /*********************************
        getUserMedia returns a Promise
        resolve - returns a MediaStream Object
        reject returns one of the following errors
        AbortError - generic unknown cause
        NotAllowedError (SecurityError) - user rejected permissions
        NotFoundError - missing media track
        NotReadableError - user permissions given but hardware/OS error
        OverconstrainedError - constraint video settings preventing
        TypeError - audio: false, video: false
        *********************************/
    </script>
</body>
</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>MediaCapture and Streams API</title>
	<meta name="viewport" content="width=device-width">
	<link rel="stylesheet" href="main.css">
	</head>
	<body>
	<header>
	<h1>MediaCapture, MediaRecorder and Streams API</h1>
	</header>
	<main>
	<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit molestiae itaque facere totam saepe tempore esse temporibus, quae reprehenderit aliquid iusto ea laborum, iure eligendi odio exercitationem sapiente illum quos.</p>

	<p><button id="btnStart">START RECORDING</button><br/>
	<button id="btnStop">STOP RECORDING</button></p>

	<video controls></video>

	<video id="vid2" controls></video>

	<!-- could save to canvas and do image manipulation and saving too -->
	</main>
	<script>

	let constraintObj = {
	audio: false,
	video: {
	facingMode: "user",
	width: { min: 640, ideal: 1280, max: 1920 },
	height: { min: 480, ideal: 720, max: 1080 }
	}
	};
	// width: 1280, height: 720 -- preference only
	// facingMode: {exact: "user"}
	// facingMode: "environment"

	//handle older browsers that might implement getUserMedia in some way
	if (navigator.mediaDevices === undefined) {
	navigator.mediaDevices = {};
	navigator.mediaDevices.getUserMedia = function(constraintObj) {
	let getUserMedia = navigator.webkitGetUserMedia \|\| navigator.mozGetUserMedia;
	if (!getUserMedia) {
	return Promise.reject(new Error('getUserMedia is not implemented in this browser'));
	}
	return new Promise(function(resolve, reject) {
	getUserMedia.call(navigator, constraintObj, resolve, reject);
	});
	}
	}else{
	navigator.mediaDevices.enumerateDevices()
	.then(devices => {
	devices.forEach(device=>{
	console.log(device.kind.toUpperCase(), device.label);
	//, device.deviceId
	})
	})
	.catch(err=>{
	console.log(err.name, err.message);
	})
	}

	navigator.mediaDevices.getUserMedia(constraintObj)
	.then(function(mediaStreamObj) {
	//connect the media stream to the first video element
	let video = document.querySelector('video');
	if ("srcObject" in video) {
	video.srcObject = mediaStreamObj;
	} else {
	//old version
	video.src = window.URL.createObjectURL(mediaStreamObj);
	}

	video.onloadedmetadata = function(ev) {
	//show in the video element what is being captured by the webcam
	video.play();
	};

	//add listeners for saving video/audio
	let start = document.getElementById('btnStart');
	let stop = document.getElementById('btnStop');
	let vidSave = document.getElementById('vid2');
	let mediaRecorder = new MediaRecorder(mediaStreamObj);
	let chunks = [];

	start.addEventListener('click', (ev)=>{
	mediaRecorder.start();
	console.log(mediaRecorder.state);
	})
	stop.addEventListener('click', (ev)=>{
	mediaRecorder.stop();
	console.log(mediaRecorder.state);
	});
	mediaRecorder.ondataavailable = function(ev) {
	chunks.push(ev.data);
	}
	mediaRecorder.onstop = (ev)=>{
	let blob = new Blob(chunks, { 'type' : 'video/mp4;' });
	chunks = [];
	let videoURL = window.URL.createObjectURL(blob);
	vidSave.src = videoURL;
	}
	})
	.catch(function(err) {
	console.log(err.name, err.message);
	});

	/*********************************
	getUserMedia returns a Promise
	resolve - returns a MediaStream Object
	reject returns one of the following errors
	AbortError - generic unknown cause
	NotAllowedError (SecurityError) - user rejected permissions
	NotFoundError - missing media track
	NotReadableError - user permissions given but hardware/OS error
	OverconstrainedError - constraint video settings preventing
	TypeError - audio: false, video: false
	*********************************/
	</script>
	</body>
	</html>