refactor(plex): extract PlexPlayer track selection into usePlexTracks
S4a-4a of the PlexPlayer decomposition. Move audio/subtitle track selection + subtitle rendering into usePlexTracks: the selected-ordinal state, change/cycle audio+subtitle, the debounced sub-offset, the audio A/V-sync offset, and the two subtitle effects (force-showing the mounted track + positioning cues at the user's subPos). The shared media refs (video/hls/audio/aoff/abs/multiAudio) stay component-owned and are passed in, since loadSession + the detail effect write audioRef too; absRef is hoisted above the hook call for that. No behaviour change; verified by self-E2E (subtitle on/off via 'S' mounts/removes the <track>, mode 'showing', VTT 804 cues all positioned to line=subPos, subLang persists; playback uninterrupted). Audio switch is single-track here so cycleAudio correctly no-ops.
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@@ -8,13 +8,14 @@ import {
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type WheelEvent as ReactWheelEvent,
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} from "react";
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import type { QueryClient } from "@tanstack/react-query";
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import Hls from "hls.js";
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import {
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exitFullscreen,
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fullscreenElement,
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onFullscreenChange,
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requestFullscreen,
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} from "./fullscreen";
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import { api, type PlexMarker } from "./api";
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import { api, type PlexItemDetail, type PlexMarker } from "./api";
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import { qk } from "./queryKeys";
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import { clamp01, type PlexPlayerPrefs } from "./plexPlayerPrefs";
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@@ -310,3 +311,180 @@ export function useAutoSkip(opts: {
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return { activeMarker, skipProgress, skipProgressRef, cancelAutoSkipRef, doSkip };
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}
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// Audio/subtitle track selection + subtitle rendering. Owns the selected-ordinal state and the
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// audio/subtitle change/cycle handlers; audio switches re-map server-side via loadSession (single
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// stream) or client-side via hls.js (multi-rendition), while subtitle switches just flip the single
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// mounted <track>. The shared media refs (video/hls/audio/aoff/abs/multiAudio) are owned by the
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// component and passed in so this hook and the media session read/write the same substrate.
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export function usePlexTracks(opts: {
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id: string;
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detail: PlexItemDetail | undefined;
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sessionK: number;
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subOffset: number;
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subPos: number;
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loadSession: (startAt: number, resumePlay?: boolean) => Promise<void>;
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patchPrefs: (patch: Partial<PlexPlayerPrefs>) => void;
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videoRef: RefObject<HTMLVideoElement | null>;
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hlsRef: RefObject<Hls | null>;
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multiAudioRef: RefObject<boolean>;
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audioRef: MutableRefObject<number | null>;
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aoffRef: MutableRefObject<number>;
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absRef: MutableRefObject<number>;
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}): {
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audioOrd: number | null;
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setAudioOrd: (ord: number | null) => void;
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subOrd: number | null;
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setSubOrd: (ord: number | null) => void;
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changeAudio: (ord: number | null) => void;
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changeSubtitle: (ord: number | null) => void;
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cycleAudio: () => void;
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cycleSubtitle: () => void;
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changeAudioOffset: (v: number) => void;
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textSubs: PlexItemDetail["subtitle_streams"];
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selectedSub: PlexItemDetail["subtitle_streams"][number] | null;
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subTrackOffset: number;
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} {
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const { id, detail, sessionK, subOffset, subPos, loadSession, patchPrefs } = opts;
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const { videoRef, hlsRef, multiAudioRef, audioRef, aoffRef, absRef } = opts;
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// Selected audio / subtitle stream ordinals (null audio = default first; null subtitle = off).
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const [audioOrd, setAudioOrd] = useState<number | null>(null);
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const [subOrd, setSubOrd] = useState<number | null>(null);
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// Debounced user subtitle offset: avoids re-fetching the VTT on every slider step while dragging.
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const [subOffApplied, setSubOffApplied] = useState(subOffset);
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useEffect(() => {
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const tmr = window.setTimeout(() => setSubOffApplied(subOffset), 250);
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return () => window.clearTimeout(tmr);
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}, [subOffset]);
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// Switching AUDIO re-maps the track server-side, so it restarts the session at the current
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// position (like a seek). The ref is updated synchronously so loadSession sees it.
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const changeAudio = useCallback(
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(ord: number | null) => {
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audioRef.current = ord;
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setAudioOrd(ord);
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// Remember the LANGUAGE (not the ord) so F5 / the next item restores this choice. Menu stays open.
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patchPrefs({
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audioLang:
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ord == null ? "" : (detail?.audio_streams.find((s) => s.ord === ord)?.language ?? ""),
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});
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if (multiAudioRef.current && hlsRef.current) {
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// Multi-rendition: switch the audio track CLIENT-SIDE — instant, same timeline, no restart.
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try {
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hlsRef.current.audioTrack = ord ?? 0;
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} catch {
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/* ignore */
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}
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} else {
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loadSession(absRef.current); // single-audio: re-map the track server-side (session restart)
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}
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},
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[loadSession, detail, patchPrefs, audioRef, multiAudioRef, hlsRef, absRef],
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);
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// Subtitles are native <track>s overlaid by the browser — switching one just flips TextTrack modes
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// (applied by the effect below), NO session restart. Off = null.
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const changeSubtitle = useCallback(
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(ord: number | null) => {
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setSubOrd(ord);
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patchPrefs({
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subLang:
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ord == null ? "" : (detail?.subtitle_streams.find((s) => s.ord === ord)?.language ?? ""),
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});
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},
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[detail, patchPrefs],
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);
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// 'A' cycles audio tracks; 'S' cycles subtitle (off → each text sub → off).
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const cycleAudio = useCallback(() => {
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const streams = detail?.audio_streams ?? [];
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if (streams.length < 2) return;
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const idx = streams.findIndex((s) => s.ord === (audioRef.current ?? 0));
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const next = streams[(idx + 1) % streams.length]!; // length >= 2 (guarded), so in-bounds
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changeAudio(next.ord === 0 ? null : next.ord);
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}, [detail, changeAudio, audioRef]);
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const cycleSubtitle = useCallback(() => {
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const subs = (detail?.subtitle_streams ?? []).filter((s) => s.text);
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const order: (number | null)[] = [null, ...subs.map((s) => s.ord)];
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const i = order.findIndex((o) => o === subOrd);
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changeSubtitle(order[(i + 1) % order.length]!); // order always has [null, ...] → non-empty
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}, [detail, subOrd, changeSubtitle]);
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// Audio A/V-sync offset: persist immediately (for the slider) but debounce the session restart so
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// dragging doesn't respawn ffmpeg on every step.
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const aoffTimer = useRef<number | null>(null);
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const changeAudioOffset = useCallback(
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(v: number) => {
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patchPrefs({ audioOffset: v });
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aoffRef.current = v;
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if (aoffTimer.current) window.clearTimeout(aoffTimer.current);
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aoffTimer.current = window.setTimeout(() => loadSession(absRef.current), 500);
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},
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[patchPrefs, loadSession, aoffRef, absRef],
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);
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// Text subtitles offered in the picker; image subs (PGS/VobSub) can't be shown as text.
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const textSubs = (detail?.subtitle_streams ?? []).filter((s) => s.text);
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// Render ONLY the selected sub as a single <track> (below) — rendering all of them and flipping
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// modes raced (multiple "showing" at once → overlapping HU+EN) especially across a session restart.
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const selectedSub = textSubs.find((s) => s.ord === subOrd) ?? null;
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// The backend shifts the absolute-time VTT by (sessionK − userSubOffset): sessionK aligns it to the
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// HLS session's zero-based clock; subtracting the user offset makes +offset show the sub LATER. Uses
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// the DEBOUNCED user offset so slider drags don't refetch the whole VTT per step.
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// sessionK is already lag-compensated (see loadSession), so it is the true content-zero the VTT
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// must be shifted by; the user offset nudges on top.
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const subTrackOffset = sessionK - subOffApplied;
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// Force the single mounted track to "showing" (its VTT loads on mount; `default` alone can be flaky
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// after a remount). Re-runs when the selection or the shifted-track identity changes (fresh <track>).
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useEffect(() => {
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const video = videoRef.current;
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if (!video) return;
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for (const tr of Array.from(video.textTracks)) tr.mode = "showing";
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}, [subOrd, id, subTrackOffset, videoRef]);
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// Position subtitle cues per the user's vertical setting (subPos). The video fills the viewport
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// height, so a default (line "auto") cue renders at the extreme bottom and clips — line% lifts it.
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// Re-applied on each cue change (hls.js streams cues in as subtitle segments load; no per-cue event).
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useEffect(() => {
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const video = videoRef.current;
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if (!video) return;
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const placeAll = () => {
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for (const tr of Array.from(video.textTracks)) {
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for (const c of Array.from(tr.cues || [])) {
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try {
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(c as VTTCue).snapToLines = false;
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(c as VTTCue).line = subPos;
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} catch {
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/* not a positionable cue */
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}
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}
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}
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};
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const bind = (tr: TextTrack) => tr.addEventListener("cuechange", placeAll);
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for (const tr of Array.from(video.textTracks)) bind(tr);
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const onAddTrack = (e: TrackEvent) => {
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if (e.track) {
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bind(e.track as TextTrack);
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placeAll();
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}
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};
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video.textTracks.addEventListener("addtrack", onAddTrack as EventListener);
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placeAll();
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return () => {
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video.textTracks.removeEventListener("addtrack", onAddTrack as EventListener);
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for (const tr of Array.from(video.textTracks)) tr.removeEventListener("cuechange", placeAll);
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};
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}, [id, subPos, videoRef]);
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return {
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audioOrd,
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setAudioOrd,
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subOrd,
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setSubOrd,
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changeAudio,
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changeSubtitle,
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cycleAudio,
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cycleSubtitle,
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changeAudioOffset,
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textSubs,
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selectedSub,
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subTrackOffset,
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};
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}
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