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JSMpegPlayer.tsx
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JSMpegPlayer.tsx
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import { baseUrl } from "@/api/baseUrl";
import { useResizeObserver } from "@/hooks/resize-observer";
// @ts-expect-error we know this doesn't have types
import JSMpeg from "@cycjimmy/jsmpeg-player";
import React, { useEffect, useMemo, useRef, useId } from "react";
type JSMpegPlayerProps = {
className?: string;
camera: string;
width: number;
height: number;
containerRef?: React.MutableRefObject<HTMLDivElement | null>;
onPlaying?: () => void;
};
export default function JSMpegPlayer({
camera,
width,
height,
className,
containerRef,
onPlaying,
}: JSMpegPlayerProps) {
const url = `${baseUrl.replace(/^http/, "ws")}live/jsmpeg/${camera}`;
const playerRef = useRef<HTMLDivElement | null>(null);
const videoRef = useRef(null);
const internalContainerRef = useRef<HTMLDivElement | null>(null);
const onPlayingRef = useRef(onPlaying);
const selectedContainerRef = useMemo(
() => containerRef ?? internalContainerRef,
[containerRef, internalContainerRef],
);
const [{ width: containerWidth, height: containerHeight }] =
useResizeObserver(selectedContainerRef);
const stretch = true;
const aspectRatio = width / height;
const fitAspect = useMemo(
() => containerWidth / containerHeight,
[containerWidth, containerHeight],
);
const scaledHeight = useMemo(() => {
if (selectedContainerRef?.current && width && height) {
const scaledHeight =
aspectRatio < (fitAspect ?? 0)
? Math.floor(
Math.min(
containerHeight,
selectedContainerRef.current?.clientHeight,
),
)
: aspectRatio >= fitAspect
? Math.floor(containerWidth / aspectRatio)
: Math.floor(containerWidth / aspectRatio) / 1.5;
const finalHeight = stretch
? scaledHeight
: Math.min(scaledHeight, height);
if (finalHeight > 0) {
return finalHeight;
}
}
}, [
aspectRatio,
containerWidth,
containerHeight,
fitAspect,
height,
width,
stretch,
selectedContainerRef,
]);
const scaledWidth = useMemo(() => {
if (aspectRatio && scaledHeight) {
return Math.ceil(scaledHeight * aspectRatio);
}
}, [scaledHeight, aspectRatio]);
const uniqueId = useId();
useEffect(() => {
onPlayingRef.current = onPlaying;
}, [onPlaying]);
useEffect(() => {
if (!playerRef.current || videoRef.current) {
return;
}
videoRef.current = new JSMpeg.VideoElement(
playerRef.current,
url,
{ canvas: `#${CSS.escape(uniqueId)}` },
{
protocols: [],
audio: false,
videoBufferSize: 1024 * 1024 * 4,
onPlay: () => {
onPlayingRef.current?.();
},
},
);
}, [url, uniqueId]);
return (
<div className={className}>
<div className="size-full" ref={internalContainerRef}>
<div ref={playerRef} className="jsmpeg">
<canvas
id={uniqueId}
style={{
width: scaledWidth ?? width,
height: scaledHeight ?? height,
}}
></canvas>
</div>
</div>
</div>
);
}