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transparency.html
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transparency.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Simplified Example</title>
<script src="https://cdn.jsdelivr.net/npm/@mediapipe/selfie_segmentation/selfie_segmentation.js"
crossorigin="anonymous"></script>
<script src="https://mrdoob.github.io/stats.js/build/stats.min.js"></script>
<style>
body {
background-color: cyan;
}
.mirror {
transform: scaleX(-1);
}
</style>
</head>
<body>
<div class="container">
<div>
<h2>Sender</h2>
<div>
<p>
<label for="enabled">Enable segmentation and transparency: </label>
<input name="enabled" id="enabled" class="senderControls" type="checkbox" checked/>
</p>
<p>
<label for="devices">Select your camera device: </label>
<select name="devices" id="devices" class="senderControls"></select>
</p>
<p>Select a resolution to begin camera capture:
<button id="qvga" class="senderControls">QVGA</button>
<button id="vga" class="senderControls">VGA</button>
<button id="hd" class="senderControls">HD</button>
<button id="uhd" class="senderControls">UHD</button>
</p>
</div>
</div>
<br>
<div>
<video id="transparent_selfie" class="mirror" autoplay muted playsinline></video>
<div id="senderStats">
</div>
</div>
<br>
<button id="call" class="senderControls" disabled>Send through peerConnection</button>
<br>
<div>
<h2>Receiver</h2>
<video id="receiver" autoplay muted playsinline></video>
<div id="receiverStats">
</div>
</div>
<script type="module">
if (typeof MediaStreamTrackProcessor === 'undefined' ||
typeof MediaStreamTrackGenerator === 'undefined') {
alert(
'Your browser does not support the experimental MediaStreamTrack API ' +
'for Insertable Streams of Media.)')
}
const selfieVid = document.querySelector('video#transparent_selfie');
const deviceSelect = document.querySelector('select#devices');
const qvgaBtn = document.querySelector('button#qvga');
const vgaBtn = document.querySelector('button#vga');
const hdBtn = document.querySelector('button#hd');
const uhdBtn = document.querySelector('button#uhd');
const callBtn = document.querySelector('button#call');
const enabled = document.querySelector('input#enabled');
let videoWidth = 640;
let videoHeight = 480;
const FRAME_RATE = 30;
let videoDevices = [];
function addGreenScreen(stream) {
// Safari & Firefox don't support OffscreenCanvas
const greenCanvas = typeof OffscreenCanvas === 'undefined' ? document.createElement("canvas") :
new OffscreenCanvas(1, 1);
const greenCtx = greenCanvas.getContext('2d');
function addGreen(frame, controller) {
const height = frame.codedHeight;
const width = frame.codedWidth;
greenCanvas.height = height;
greenCanvas.width = width;
greenCtx.clearRect(0, 0, width, height);
greenCtx.drawImage(frame, 0, 0, width, height);
// Only overwrite non-existing pixels with green.
greenCtx.globalCompositeOperation = 'destination-over';
greenCtx.fillStyle = '#00FF00';
greenCtx.fillRect(0, 0, width, height);
const senderFrame = new VideoFrame(greenCanvas);
controller.enqueue(senderFrame);
frame.close();
}
// Add green screen
const track = stream.getVideoTracks()[0];
const greenProcessor = new MediaStreamTrackProcessor({track});
const greenGenerator = new MediaStreamTrackGenerator({kind: 'video'});
const greenStream = new MediaStream([greenGenerator]);
greenProcessor.readable
.pipeThrough(new TransformStream({
transform: (frame, controller) => addGreen(frame, controller)
}))
.pipeTo(greenGenerator.writable)
.catch(err => console.error("add green screen error", err));
return greenStream;
}
// Sender
async function sendVideo(stream) {
console.log("peerConnection starting");
const [track] = stream.getVideoTracks();
const pc = new RTCPeerConnection();
pc.addTrack(track, stream);
pc.onicecandidate = candidate => {
const toReceiverEvent = new CustomEvent('candidate', {detail: candidate});
document.dispatchEvent(toReceiverEvent);
};
const offer = await pc.createOffer();
await pc.setLocalDescription(offer);
const toReceiverEvent = new CustomEvent('offer', {detail: offer});
document.dispatchEvent(toReceiverEvent);
document.addEventListener('answer', async e => {
console.debug(e.detail);
await pc.setRemoteDescription(e.detail);
});
}
// Segment
//const ctx = selfieCanvas.getContext('2d');
const segmentCanvas = new OffscreenCanvas(1, 1);
const segmentCtx = segmentCanvas.getContext('2d');
const selfieSegmentation = new SelfieSegmentation({
locateFile: (file) => {
return `https://cdn.jsdelivr.net/npm/@mediapipe/selfie_segmentation/${file}`;
}
});
selfieSegmentation.setOptions({
modelSelection: 1,
});
// Sender stats setup
const senderStats = new Stats();
document.querySelector('div#senderStats').appendChild(senderStats.dom);
senderStats.dom.style.position = 'relative';
senderStats.dom.style.display = 'none';
async function segment(frame, controller) {
const height = frame.codedHeight;
const width = frame.codedWidth;
segmentCanvas.height = height;
segmentCanvas.width = width;
segmentCtx.drawImage(frame, 0, 0, width, height);
// stats setup
senderStats.begin();
await selfieSegmentation.onResults(async results => {
segmentCtx.clearRect(0, 0, width, height);
segmentCtx.drawImage(results.segmentationMask, 0, 0, width, height);
// Grab the transparent image
// segmentCtx.save();
// Add the original video back in only overwriting the masked pixels
segmentCtx.globalCompositeOperation = 'source-in';
segmentCtx.drawImage(results.image, 0, 0, width, height);
// ToDo: need to get a different controller
const selfieFrame = new VideoFrame(segmentCanvas);
controller.enqueue(selfieFrame);
frame.close();
senderStats.end();
});
await selfieSegmentation.send({image: segmentCanvas});
}
// Get Video
async function getVideo(width, height) {
// clean up resources if switching sources
if (window.stream)
window.stream.getTracks().forEach(track => track.stop());
// Use the last res when changing cameras
if (!width) {
width = videoWidth;
height = videoHeight;
} else {
videoHeight = height;
videoWidth = width;
}
const videoSource = videoDevices[deviceSelect.selectedIndex || 0]?.deviceId;
const stream = await navigator.mediaDevices.getUserMedia(
{
video:
{
height: height, width: width, frameRate: FRAME_RATE,
deviceId: videoSource ? {exact: videoSource} : undefined
}
});
window.stream = stream;
const settings = stream.getVideoTracks()[0].getSettings();
console.log(`Capture camera with device ${stream.getVideoTracks()[0].label} at ${settings.width}x${settings.height}`);
let segmentStream;
// Option to run without segmentation/transparency for benchmarking
if (enabled.checked) {
callBtn.disabled = false;
senderStats.dom.style.display = 'block'; // show stats
let [track] = stream.getVideoTracks();
const segmentGenerator = new MediaStreamTrackGenerator({kind: 'video'});
const processor = new MediaStreamTrackProcessor({track});
segmentStream = new MediaStream([segmentGenerator]);
selfieVid.srcObject = segmentStream;
processor.readable.pipeThrough(new TransformStream({
transform: (frame, controller) => segment(frame, controller)
}))
.pipeTo(segmentGenerator.writable)
.catch(err => console.error("green screen generator error", err));
} else {
segmentStream = stream;
selfieVid.srcObject = stream;
callBtn.disabled = false;
}
// Note: doesn't work (change to let sendStream
// sendStream.onaddtrack = (track)=> showTransparentSelfie(track);
// sendStream.onactive = (track)=> showTransparentSelfie(track);
callBtn.onclick = async () => {
// ToDo: replace track to allow cam switch when peerConnection is open
// Disable controls since the peerConnection won't update
document.querySelectorAll('.senderControls').forEach(element => element.disabled = true);
if (enabled.checked) {
const greenStream = addGreenScreen(segmentStream);
await sendVideo(greenStream);
} else {
await sendVideo(stream);
}
};
}
async function start() {
// allow camera selection
let devices = await navigator.mediaDevices.enumerateDevices();
videoDevices = devices.filter(device => device.kind === 'videoinput');
videoDevices.forEach(device => {
const option = document.createElement('option');
option.text = device.label;
deviceSelect.appendChild(option);
});
deviceSelect.onchange = () => getVideo();
qvgaBtn.onclick = () => getVideo(320, 240);
vgaBtn.onclick = () => getVideo(640, 480);
hdBtn.onclick = () => getVideo(1280, 720);
uhdBtn.onclick = () => getVideo(1920, 1080);
}
start().catch(err => console.error(err));
</script>
<!-- Receiver -->
<script type="module">
// Transparency
function addAlpha(imageData) {
let data = imageData.data;
const gFloor = 105; // consider any green above this value to be transparent
const rbCeiling = 80; // highest value for red and blue to be considered transparent
for (let r = 0, g = 1, b = 2, a = 3; a < data.length; r += 4, g += 4, b += 4, a += 4) {
if (data[r] <= rbCeiling && data[b] <= rbCeiling && data[g] >= gFloor)
data[a] = 0;
}
return imageData;
}
// Receiver
const receiverOffScreen = typeof OffscreenCanvas === 'undefined' ? document.createElement("canvas") :
new OffscreenCanvas(1, 1);
const receiverCtx = receiverOffScreen.getContext("2d");
// stats setup
// let lastFrameTime = new Date();
const recStats = new Stats();
document.querySelector('div#receiverStats').appendChild(recStats.dom);
recStats.dom.style.position = 'relative';
recStats.dom.style.display = 'none';
function addTransparency(frame, controller) {
recStats.begin();
const height = frame.codedHeight;
const width = frame.codedWidth;
receiverOffScreen.height = height;
receiverOffScreen.width = width;
receiverCtx.drawImage(frame, 0, 0, width, height);
let imageData = receiverCtx.getImageData(0, 0, width, height);
let transparentImageData = addAlpha(imageData);
receiverCtx.putImageData(transparentImageData, 0, 0);
const newFrame = new VideoFrame(receiverOffScreen);
controller.enqueue(newFrame);
frame.close();
recStats.end();
}
document.addEventListener('offer', async e => {
console.debug(e.detail);
const pc = new RTCPeerConnection();
pc.ontrack = async e => {
console.debug(e);
const {track} = e;
const processor = new MediaStreamTrackProcessor({track});
const generator = new MediaStreamTrackGenerator({kind: 'video'});
const transparentStream = new MediaStream([generator]);
document.querySelector('video#receiver').srcObject = transparentStream;
await processor.readable.pipeThrough(new TransformStream({
transform: (frame, controller) => addTransparency(frame, controller)
})).pipeTo(generator.writable);
};
document.addEventListener('candidate', async e => {
console.debug(e.detail);
await pc.addIceCandidate(e.detail.candidate);
});
await pc.setRemoteDescription(e.detail);
window.receiverPc = pc;
const answer = await pc.createAnswer();
await pc.setLocalDescription(answer);
const toSenderEvent = new CustomEvent('answer', {detail: answer});
document.dispatchEvent(toSenderEvent);
recStats.dom.style.display = 'block';
});
</script>
</div>
</body>
</html>