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llink/js/src/features/particles/media-particle-view.tsx
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TypeScript

import { useEffect, useRef, useState } from "react";
import type { Particle } from "@/api/types";
import type { ParticlePath } from "@/lib/particle-path";
import { useDownloadUrl } from "@/hooks/use-download-url";
import { useTranscriptPlayback } from "@/hooks/use-transcript-playback";
import { TranscriptOverlay } from "@/features/particles/transcript-overlay";
import { Skeleton } from "@/components/ui/skeleton";
import { AudioLevelBars } from "@/components/audio/audio-level-bars";
import { useAudioSource } from "@/components/audio/use-audio-source";
import { useParticleAttachments } from "@/hooks/use-particle-attachments";
import { ParticleAttachments } from "@/features/particles/particle-attachments";
type MediaParticle = Extract<Particle, { type: "media" }>;
interface MediaParticleViewProps {
particle: MediaParticle;
streamPath: ParticlePath;
paused: boolean;
onEnded: () => void;
onProgress?: (ratio: number) => void;
}
export function MediaParticleView({
particle,
streamPath,
paused,
onEnded,
onProgress,
}: MediaParticleViewProps) {
const { data: url, error } = useDownloadUrl(particle.properties.object_id);
const { attachments } = useParticleAttachments(streamPath, particle.id);
const videoRef = useRef<HTMLVideoElement>(null);
const audioRef = useRef<HTMLAudioElement>(null);
const isAudio = particle.properties.mime_type?.startsWith("audio/");
const [currentTime, setCurrentTime] = useState(0);
const transcript = particle.properties.transcript;
const { activeSentence, activeWordIndex } = useTranscriptPlayback(
transcript,
currentTime,
);
// WORKAROUND: useAudioSource needs an audio element, but audioRef is only set after mount
const [audioEl, setAudioEl] = useState<HTMLAudioElement | null>(null);
const audioSource = useAudioSource(audioEl);
useEffect(() => {
const el = isAudio ? audioRef.current : videoRef.current;
if (!el) return;
if (paused) {
el.pause();
} else {
el.play().catch(() => {
console.warn("Playback failed", { particleId: particle.id });
});
}
}, [paused, isAudio, particle.id]);
if (error) {
return (
<div className="text-muted-foreground flex items-center justify-center text-sm">
Failed to load media
</div>
);
}
if (!url) {
return <Skeleton className="h-full w-full rounded-none" />;
}
const handleTimeUpdate = (e: React.SyntheticEvent<HTMLAudioElement | HTMLVideoElement>) => {
const { currentTime: time, duration } = e.currentTarget;
setCurrentTime(time);
if (duration > 0) onProgress?.(time / duration);
};
const attachmentOverlay = attachments.length > 0 && (
<div className="absolute inset-x-0 bottom-16 z-10 px-4">
<ParticleAttachments attachments={attachments} />
</div>
);
if (isAudio) {
return (
<div className="relative flex h-full w-full items-center justify-center bg-black/90">
<audio
ref={(el) => {
audioRef.current = el;
setAudioEl(el);
}}
crossOrigin="anonymous"
src={url}
autoPlay
onEnded={onEnded}
onTimeUpdate={handleTimeUpdate}
/>
{audioSource && (
<div className="z-10 absolute bottom-5">
<AudioLevelBars sourceNode={audioSource.sourceNode} />
</div>
)}
{transcript && (
<TranscriptOverlay
transcript={transcript}
activeSentence={activeSentence}
activeWordIndex={activeWordIndex}
centered
/>
)}
{attachmentOverlay}
</div>
);
}
return (
<div className="relative h-full w-full">
<video
ref={videoRef}
src={url}
autoPlay
playsInline
onEnded={onEnded}
onTimeUpdate={handleTimeUpdate}
className="h-full w-full object-cover"
/>
{transcript && (
<TranscriptOverlay
transcript={transcript}
activeSentence={activeSentence}
activeWordIndex={activeWordIndex}
/>
)}
{attachmentOverlay}
</div>
);
}