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<script lang="ts">
import 'rvfc-polyfill';
import { onDestroy } from 'svelte';
import {
mediaStreamStatus,
MediaStreamStatusEnum,
onFrameChangeStore,
mediaStream
} from '$lib/mediaStream';
let videoEl: HTMLVideoElement;
let videoFrameCallbackId: number;
const WIDTH = 512;
const HEIGHT = 512;
onDestroy(() => {
if (videoFrameCallbackId) videoEl.cancelVideoFrameCallback(videoFrameCallbackId);
});
$: if (videoEl) {
videoEl.srcObject = $mediaStream;
}
async function onFrameChange(now: DOMHighResTimeStamp, metadata: VideoFrameCallbackMetadata) {
const blob = await grapBlobImg();
onFrameChangeStore.set({ blob });
videoFrameCallbackId = videoEl.requestVideoFrameCallback(onFrameChange);
}
$: if ($mediaStreamStatus == MediaStreamStatusEnum.CONNECTED) {
videoFrameCallbackId = videoEl.requestVideoFrameCallback(onFrameChange);
}
async function grapBlobImg() {
const canvas = new OffscreenCanvas(WIDTH, HEIGHT);
const videoW = videoEl.videoWidth;
const videoH = videoEl.videoHeight;
const aspectRatio = WIDTH / HEIGHT;
const ctx = canvas.getContext('2d') as OffscreenCanvasRenderingContext2D;
ctx.drawImage(
videoEl,
videoW / 2 - (videoH * aspectRatio) / 2,
0,
videoH * aspectRatio,
videoH,
0,
0,
WIDTH,
HEIGHT
);
const blob = await canvas.convertToBlob({ type: 'image/jpeg', quality: 1 });
return blob;
}
</script>
<div class="relative z-10 aspect-square w-full object-cover">
<video
class="aspect-square w-full object-cover"
bind:this={videoEl}
playsinline
autoplay
muted
loop
></video>
</div>
<svg
xmlns="http://www.w3.org/2000/svg"
viewBox="0 0 448 448"
width="100"
class="absolute top-0 z-0 w-full p-4 opacity-20"
>
<path
fill="currentColor"
d="M224 256a128 128 0 1 0 0-256 128 128 0 1 0 0 256zm-45.7 48A178.3 178.3 0 0 0 0 482.3 29.7 29.7 0 0 0 29.7 512h388.6a29.7 29.7 0 0 0 29.7-29.7c0-98.5-79.8-178.3-178.3-178.3h-91.4z"
/>
</svg>
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