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videoUploading: add webcam as a source video option #562

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Merged
kainino0x merged 2 commits into from
Apr 16, 2026
Merged

videoUploading: add webcam as a source video option #562

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videoUploading: add webcam as a source video option
kainino0x Apr 16, 2026
ce659de
show frame dimensions
kainino0x Apr 16, 2026
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6 changes: 3 additions & 3 deletions sample/videoUploading/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -23,9 +23,8 @@
height: 100%; /* make body fill the browser window */
}
canvas {
width: 100%;
height: 100%;
max-width: 100%;
width: min(100vw, 100vh);
aspect-ratio: 4 / 3;
display: block;
}
</style>
Expand All @@ -34,5 +33,6 @@
</head>
<body>
<canvas></canvas>
<pre id=videoinfo></pre>
</body>
</html>
43 changes: 40 additions & 3 deletions sample/videoUploading/main.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,14 @@ const videos = {
url: '../../assets/video/Video_360°._Timelapse._Bled_Lake_in_Slovenia..webm.720p.vp9.webm',
mode: '360',
},
webcam: {
url: '',
mode: 'mirror',
},
} as const;

const videoinfo = document.getElementById('videoinfo') as HTMLPreElement;

const canvas = document.querySelector('canvas') as HTMLCanvasElement;
const context = canvas.getContext('webgpu');
const presentationFormat = navigator.gpu.getPreferredCanvasFormat();
Expand Down Expand Up @@ -90,7 +96,21 @@ let canReadVideo = false;

async function playVideo(videoName: keyof typeof videos) {
canReadVideo = false;
video.src = videos[videoName].url;

if (video.srcObject) {
(video.srcObject as MediaStream)
.getTracks()
.forEach((track) => track.stop());
video.srcObject = null;
}

if (videoName === 'webcam') {
video.srcObject = await navigator.mediaDevices.getUserMedia({
video: true,
});
} else {
video.src = videos[videoName].url;
}
await video.play();
canReadVideo = true;
}
Expand Down Expand Up @@ -120,8 +140,22 @@ function drawVideo() {
const maxSize = device.limits.maxTextureDimension2D;
canvas.width = Math.min(Math.max(1, canvas.offsetWidth), maxSize);
canvas.height = Math.min(Math.max(1, canvas.offsetHeight), maxSize);
const externalTextureSource =
settings.videoSource === 'videoFrame' ? new VideoFrame(video) : video;
const videoFrame =
settings.videoSource === 'videoFrame' ? new VideoFrame(video) : null;
const externalTextureSource = videoFrame ?? video;
videoinfo.textContent = `HTMLVideoElement: ${video.videoWidth}x${video.videoHeight}`;
if (videoFrame) {
videoinfo.textContent +=
'\nVideoFrame: ' +
JSON.stringify(
{
codedRect: videoFrame.codedRect,
visibleRect: videoFrame.visibleRect,
},
undefined,
2
);
}

const mode = videos[settings.video].mode;
const pipeline = mode === '360' ? video360Pipeline : videoCoverPipeline;
Expand Down Expand Up @@ -182,6 +216,9 @@ function drawVideo() {
combinedAspect > 1 ? [1 / combinedAspect, 1] : [1, combinedAspect],
mat
);
if (mode === 'mirror') {
mat3.scale(mat, [-1, 1], mat);
}
mat3.translate(mat, [-0.5, -0.5], mat);
device.queue.writeBuffer(uniformBuffer, 0, mat);
}
Expand Down
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