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<script lang="ts">
import 'rvfc-polyfill';
import { onMount, onDestroy } from 'svelte';
import {
mediaStreamState,
mediaStreamActions,
isMediaStreaming,
MediaStreamStatus,
onFrameChangeStore
} from '$lib/mediaStream';
$: mediaStream = $mediaStreamState.mediaStream;
let videoEl: HTMLVideoElement;
let videoFrameCallbackId: number;
const WIDTH = 512;
const HEIGHT = 512;
onDestroy(() => {
if (videoFrameCallbackId) videoEl.cancelVideoFrameCallback(videoFrameCallbackId);
});
function srcObject(node: HTMLVideoElement, stream: MediaStream) {
node.srcObject = stream;
return {
update(newStream: MediaStream) {
if (node.srcObject != newStream) {
node.srcObject = newStream;
}
}
};
}
async function onFrameChange(now: DOMHighResTimeStamp, metadata: VideoFrameCallbackMetadata) {
const blob = await grapBlobImg();
onFrameChangeStore.set({ now, metadata, blob });
videoFrameCallbackId = videoEl.requestVideoFrameCallback(onFrameChange);
}
$: if ($isMediaStreaming == MediaStreamStatus.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>
<video
class="aspect-square w-full object-cover"
bind:this={videoEl}
playsinline
autoplay
muted
loop
use:srcObject={mediaStream}
></video>
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