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// Copyright (C) 2026 Max Boksem. See NOTICE for additional terms under GPLv3 section 7.
import { useState, useCallback, useRef, useEffect } from "react";
import { listen } from "@tauri-apps/api/event";
import type { PolledMpvState } from "@/lib/types";
import {
mpvLoad,
mpvPlay,
mpvPause,
mpvStop,
mpvSeek,
mpvSetVolume,
mpvGetState,
} from "@/lib/tauri";
import { readHwdecEnabled, readVolumePreference, writeVolumePreference } from "@/lib/player-prefs";
import { isOpeningStream } from "@/lib/stream-opening";
import { createChangeTracker } from "@/lib/change-tracker";
import { useLatestRef } from "@/hooks/useLatestRef";
const DEFAULT_STATE: PolledMpvState = {
isPlaying: false,
isPaused: false,
currentUrl: null,
volume: 100,
position: 0,
duration: 0,
playbackStarted: false,
openFailed: false,
reachedEnd: false,
waiting: false,
fallbackActive: false,
positionAt: 0,
};
export const useMpv = () => {
const [state, setState] = useState<PolledMpvState>(DEFAULT_STATE);
const [error, setError] = useState<string | null>(null);
const [firstFrameReady, setFirstFrameReady] = useState(false);
// Set only by the first-frame event. The mount check below also sets
// `firstFrameReady`, but it can't tell a stream that's still opening from
// one that's playing, so the spinner doesn't use it.
const [firstFrameSeen, setFirstFrameSeen] = useState(false);
// True while `mpvLoad` is in flight. Drives the "Opening stream" spinner
// until the polled state describes the new load.
const [loadPending, setLoadPending] = useState(false);
// Goes up by one on every load, so the spinner starts over even when the
// same URL is loaded again.
const [loadId, setLoadId] = useState(0);
// Set while the Rust-side reconnect monitor is re-issuing loadfile after
// a network-induced EndFile(Error). Cleared on the matching `mpv://reconnected`
// event or whenever the user starts a fresh load.
const [reconnecting, setReconnecting] = useState(false);
const [reconnectAttempt, setReconnectAttempt] = useState(0);
// `buffering` reflects mpv's `paused-for-cache` flag with a short debounce
// so brief stalls during startup / seeks don't flash the indicator.
const [buffering, setBuffering] = useState(false);
// Set to true when the Rust-side reconnect monitor has exhausted its
// retry budget. Indicates the URL is genuinely unreachable (DNS failure,
// server down, or the user is offline). Cleared on the next successful
// load / explicit stop.
const [loadFailed, setLoadFailed] = useState(false);
// `recentlyRecovered` is an explicit positive-acknowledgement signal that
// powers the green "Connection restored" banner. We drive it directly off
// the `mpv://reconnected` event (and the navigator.onLine auto-recovery
// path) rather than inferring it from "all flags are false now" because
// the flag transitions don't always collapse to idle in one render tick:
// e.g. when our `eof-reached` path triggered the retry, the demuxer EOF'd
// before the cache "refilled" event, so `mpv://buffered` may never fire
// and `buffering` stays stuck true — which would mask the recovered
// transition under the old flag-inference logic.
const [recentlyRecovered, setRecentlyRecovered] = useState(false);
const bufferingTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const recoveredTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const flashRecovered = useCallback(() => {
Iif (recoveredTimerRef.current) clearTimeout(recoveredTimerRef.current);
setRecentlyRecovered(true);
recoveredTimerRef.current = setTimeout(() => {
setRecentlyRecovered(false);
recoveredTimerRef.current = null;
}, 2500);
}, []);
const pollRef = useRef<ReturnType<typeof setInterval> | null>(null);
const loadingRef = useRef(false);
// The volume the user last chose this session, or the default volume from
// Settings. mpv is recreated on every load and starts at 100, so this is
// re-applied after each load to keep volume / mute consistent across
// channel and episode switches. The preference outlives the hook: the
// player can be left and reopened (remounting it) while the app runs.
const [savedVolume] = useState(readVolumePreference);
const userVolumeRef = useRef(savedVolume.volume);
// Volume to restore when unmuting.
const preMuteVolumeRef = useRef(savedVolume.preMute);
const volumeRef = useRef(DEFAULT_STATE.volume);
useEffect(() => {
volumeRef.current = state.volume;
}, [state.volume]);
// Seeks and volume changes show at once. A poll that started before one
// of them finished still has the old value, so it doesn't replace it.
const [seeks] = useState(createChangeTracker);
const [volumeChanges] = useState(createChangeTracker);
// A poll sent before a load returns can still describe the old player.
const [loads] = useState(createChangeTracker);
// Polls go out once a second and whenever mpv says the video stopped or
// moved, so two can overlap. One sent before the last poll taken is older,
// and is dropped.
const pollsSentRef = useRef(0);
const pollTakenRef = useRef(0);
// Set when mpv's state changes while a load runs, so the load reads it.
const changedWhileLoadingRef = useRef(false);
const refresh = useCallback(() => {
const seekMark = seeks.mark();
const volumeMark = volumeChanges.mark();
const loadMark = loads.mark();
const sent = ++pollsSentRef.current;
return mpvGetState()
.then((s) => {
console.debug("[useMpv] poll state:", JSON.stringify(s));
// A poll that lands mid-load may describe the previous stream (or
// none at all). Keep the reset state until the load returns.
if (loadingRef.current) return;
if (sent < pollTakenRef.current) return;
pollTakenRef.current = sent;
const readAt = performance.now();
setState((prev) => {
const seeking = seeks.isStale(seekMark);
return {
isPlaying: s.isPlaying,
isPaused: s.isPaused,
currentUrl: s.currentUrl,
volume: volumeChanges.isStale(volumeMark) ? prev.volume : s.volume,
position: seeking ? prev.position : s.position,
positionAt: seeking ? prev.positionAt : readAt,
duration: s.duration,
playbackStarted: s.playbackStarted,
openFailed: s.openFailed,
reachedEnd: s.reachedEnd,
waiting: s.waiting,
// Kept from the fallback event until a poll describes the new player.
fallbackActive: loads.isStale(loadMark)
? prev.fallbackActive
: s.fallbackActive,
};
});
})
.catch((e) => {
console.warn("[useMpv] poll failed:", e);
});
}, [seeks, volumeChanges, loads]);
// The event comes while the load runs, before a poll can report it.
useEffect(() => {
const unlistenPromise = listen<{ reason: string }>("mpv://render-fallback", (event) => {
console.warn("[useMpv] render fallback:", event.payload.reason);
setState((s) => ({ ...s, fallbackActive: true }));
});
return () => {
unlistenPromise.then((fn) => fn());
};
}, []);
// Listen for first-frame event so the frontend knows when the video is actually visible.
useEffect(() => {
const unlistenPromise = listen("mpv://first-frame", () => {
setFirstFrameReady(true);
// A frame that arrives while a load runs most likely comes from
// the stream being replaced, so it doesn't end the new stream's
// spinner. If it was the new stream's after all, the next poll's
// playbackStarted ends the spinner instead.
if (!loadingRef.current) setFirstFrameSeen(true);
});
return () => {
unlistenPromise.then((fn) => fn());
};
}, []);
// Listen for reconnect lifecycle events emitted by the Rust-side
// auto-reconnect monitor (see crates/tauri-plugin-mpv/src/reconnect.rs).
useEffect(() => {
const reconnectingP = listen<{ url: string; attempt: number }>(
"mpv://reconnecting",
(event) => {
console.warn(
`[useMpv] reconnecting (attempt #${event.payload.attempt}):`,
event.payload.url
);
setReconnecting(true);
setReconnectAttempt(event.payload.attempt);
}
);
const reconnectedP = listen<{ url: string }>("mpv://reconnected", (event) => {
console.info("[useMpv] reconnected:", event.payload.url);
setReconnecting(false);
setReconnectAttempt(0);
// Defensive: if our `eof-reached` path drove the retry, the
// demuxer EOF'd while paused-for-cache was already false, so the
// Rust monitor's "buffered" emission would never fire and
// `buffering` would stay stuck true. Clear it explicitly here so
// the recovered banner isn't masked by stale buffering state.
setBuffering(false);
Iif (bufferingTimerRef.current) {
clearTimeout(bufferingTimerRef.current);
bufferingTimerRef.current = null;
}
flashRecovered();
// The subtitles stood still while the stream reconnected, but
// mpv had already played on for a while before this event. They
// start again at once from the last reading, and catch up when
// this one comes back.
refresh();
});
// Buffering lifecycle (paused-for-cache observation in Rust). Debounce
// the "true" transition by 1.5 s so brief stalls during startup or seek
// don't flash the connection-issues indicator.
const bufferingP = listen<{ url: string }>("mpv://buffering", () => {
Iif (bufferingTimerRef.current) clearTimeout(bufferingTimerRef.current);
bufferingTimerRef.current = setTimeout(() => {
console.warn("[useMpv] buffering (stream stalled)");
setBuffering(true);
bufferingTimerRef.current = null;
}, 1500);
});
const bufferedP = listen<{ url: string }>("mpv://buffered", () => {
Eif (bufferingTimerRef.current) {
clearTimeout(bufferingTimerRef.current);
bufferingTimerRef.current = null;
}
setBuffering(false);
});
const loadFailedP = listen<{ url: string }>("mpv://load-failed", (event) => {
console.error("[useMpv] load failed (retries exhausted):", event.payload.url);
setLoadFailed(true);
setReconnecting(false);
setReconnectAttempt(0);
setBuffering(false);
Iif (bufferingTimerRef.current) {
clearTimeout(bufferingTimerRef.current);
bufferingTimerRef.current = null;
}
});
return () => {
reconnectingP.then((fn) => fn());
reconnectedP.then((fn) => fn());
bufferingP.then((fn) => fn());
bufferedP.then((fn) => fn());
loadFailedP.then((fn) => fn());
Iif (bufferingTimerRef.current) {
clearTimeout(bufferingTimerRef.current);
bufferingTimerRef.current = null;
}
if (recoveredTimerRef.current) {
clearTimeout(recoveredTimerRef.current);
recoveredTimerRef.current = null;
}
};
}, [flashRecovered, refresh]);
// On mount, check if mpv is already playing (e.g. user navigated away and back).
// If so, restore firstFrameReady immediately so the background turns transparent.
// Skip if a load was triggered during this mount cycle — the loadedThisMountRef
// flag prevents a race where the async mpvGetState() resolves after load()
// completes and incorrectly sets firstFrameReady before the first frame renders.
const loadedThisMountRef = useRef(false);
useEffect(() => {
mpvGetState()
.then((s) => {
if (
!loadingRef.current &&
!loadedThisMountRef.current &&
(s.isPlaying || s.isPaused)
) {
setFirstFrameReady(true);
}
})
.catch(() => {});
}, []);
// The URL the last load asked for. The polled state still names the
// previous stream while a load runs, and keeps naming it if the load
// fails, so a retry reads this first.
const requestedUrlRef = useRef<string | null>(null);
// Sticky last-good position. We need this (rather than `state.position`)
// for resume-on-recovery because during a Rust-side retry the polled
// position can briefly drop to 0 as the new loadfile is initialising —
// capturing the position at the moment of recovery would land us at
// 00:00. `lastKnownPositionRef` only ever takes ON forward progress,
// so an outage-time recovery sees the pre-outage position.
const lastKnownPositionRef = useRef(0);
// The stream stopped before it ever played, for example because the server
// answered with an error. Reconnect and retries-exhausted states outrank it.
const openFailed = state.openFailed && !reconnecting && !loadFailed;
// Refs that mirror state so the `online` listener (registered once)
// reads the latest values without re-binding on every poll.
const loadFailedRef = useLatestRef(loadFailed);
const openFailedRef = useLatestRef(openFailed);
const reconnectingRef = useLatestRef(reconnecting);
const currentUrlRef = useLatestRef(state.currentUrl);
useEffect(() => {
if (state.position > 1.0) {
lastKnownPositionRef.current = state.position;
}
}, [state.position]);
// The last stream a poll named. The plugin stops playback before it sends
// `mpv://window-closed`, so a poll in between already reads no stream.
const lastUrlRef = useRef<string | null>(null);
useEffect(() => {
if (state.currentUrl) lastUrlRef.current = state.currentUrl;
}, [state.currentUrl]);
// Goes up by one when mpv quits by itself, because the user closed its
// own window or pressed q there. The plugin has stopped playback by then.
// A player reopened before its first poll knows no stream yet, so it
// counts the event whatever stream it names.
const [windowClosedId, setWindowClosedId] = useState(0);
useEffect(() => {
const unlistenPromise = listen<{ url: string }>("mpv://window-closed", (event) => {
// A load replaces the player, so the old one quitting isn't the user's doing.
if (loadingRef.current) return;
const expected = requestedUrlRef.current ?? lastUrlRef.current;
if (expected !== null && event.payload.url !== expected) return;
console.info("[useMpv] mpv window closed:", event.payload.url);
setWindowClosedId((id) => id + 1);
});
return () => {
unlistenPromise.then((fn) => fn());
};
}, []);
// `load(url)` is a fresh start from 00:00 (used for channel switches /
// initial play). `load(url, startPos)` is a resume — used by the
// `online`-triggered auto-recovery and by the Retry button to preserve
// playback position across a hard restart of the mpv instance.
// `keepSubtitles` is for loading the same item again, see `mpvLoad`.
const load = useCallback(
async (url: string, startPos?: number, keepSubtitles = false) => {
if (loadingRef.current) return;
loadingRef.current = true;
const loaded = loads.begin();
loadedThisMountRef.current = true;
requestedUrlRef.current = url;
setLoadPending(true);
setLoadId((id) => id + 1);
setError(null);
setFirstFrameReady(false);
setFirstFrameSeen(false);
setReconnecting(false);
setReconnectAttempt(0);
setBuffering(false);
setLoadFailed(false);
setRecentlyRecovered(false);
Iif (bufferingTimerRef.current) {
clearTimeout(bufferingTimerRef.current);
bufferingTimerRef.current = null;
}
Iif (recoveredTimerRef.current) {
clearTimeout(recoveredTimerRef.current);
recoveredTimerRef.current = null;
}
// Fresh-start load resets the sticky position so a subsequent
// recovery for this URL can't accidentally resume into a position
// inherited from a previous channel.
if (startPos === undefined) {
lastKnownPositionRef.current = 0;
}
// Reset playing state and position immediately so the bar doesn't show stale values.
const positionAt = performance.now();
setState((s) => ({
...s,
isPlaying: false,
isPaused: false,
position: startPos ?? 0,
positionAt,
duration: 0,
playbackStarted: false,
openFailed: false,
reachedEnd: false,
waiting: false,
fallbackActive: false,
}));
try {
await mpvLoad(url, startPos, readHwdecEnabled(), keepSubtitles);
const userVolume = userVolumeRef.current;
if (userVolume !== 100) {
try {
await mpvSetVolume(userVolume);
setState((s) => ({ ...s, volume: userVolume }));
} catch (e) {
console.warn("[useMpv] re-applying volume failed:", e);
}
}
// Don't set isPlaying optimistically — let the next poll confirm it from Rust
// so transparency only kicks in once MPV is actually rendering frames.
setState((s) => ({ ...s, currentUrl: url }));
} catch (e) {
const msg = String(e);
setError(msg);
throw e;
} finally {
loadingRef.current = false;
loaded();
setLoadPending(false);
// No poll is taken while a load runs. If mpv said the video
// started or stopped meanwhile, read the state now rather
// than at the next poll.
if (changedWhileLoadingRef.current) {
changedWhileLoadingRef.current = false;
refresh();
}
}
},
[loads, refresh]
);
/**
* Loads the current stream again from where it got to, for the Retry
* buttons and the recovery below. The resume point is the sticky
* last-known position rather than the polled one, which can read 0 while
* a fresh loadfile starts. A player reopened on a stream that kept playing
* hasn't loaded anything itself, so it falls back to the polled URL.
*
* Resolves to false when there was nothing to load, or a load was still
* running. The plugin runs one load at a time, so a second one would only
* queue behind it.
*/
const reload = useCallback(async (): Promise<boolean> => {
const url = requestedUrlRef.current ?? currentUrlRef.current;
if (!url || loadingRef.current) return false;
const resumeAt = lastKnownPositionRef.current;
await load(url, resumeAt > 1.0 ? resumeAt : undefined, true);
return true;
}, [load, currentUrlRef]);
// Auto-recover when the OS reports the network came back online while
// we're either parked in `loadFailed` OR actively `reconnecting`. The
// Rust-side reconnect monitor sits on an exponential backoff between
// attempts (up to 30 s); without this hook the red banner would stay up
// for the full backoff window even though the user knows their internet
// is already back. By calling `reload()` we hard-reset the mpv
// instance immediately: the new load clears `reconnecting`/`loadFailed`
// in the same tick, and `flashRecovered()` lights the green "Connection
// restored" banner so the user gets positive confirmation.
//
// A stream that failed to open is retried too, but without the green
// banner: it never played, and the spinner shows while it tries again.
useEffect(() => {
const handleOnline = () => {
const neverOpened = openFailedRef.current;
const needsRecover = loadFailedRef.current || reconnectingRef.current || neverOpened;
if (needsRecover) {
console.info(
`[useMpv] online event (loadFailed=${loadFailedRef.current} reconnecting=${reconnectingRef.current} openFailed=${neverOpened}) — auto-recovering at pos=${lastKnownPositionRef.current.toFixed(2)}`
);
reload()
.then((reloaded) => {
if (reloaded && !neverOpened) flashRecovered();
})
.catch((e) => {
console.warn("[useMpv] auto-recover load failed:", e);
});
}
};
window.addEventListener("online", handleOnline);
return () => window.removeEventListener("online", handleOnline);
}, [reload, flashRecovered, loadFailedRef, openFailedRef, reconnectingRef]);
const play = useCallback(async () => {
console.log("[useMpv] play called");
try {
await mpvPlay();
setState((s) => ({ ...s, isPlaying: true, isPaused: false }));
} catch (e) {
console.error("[useMpv] mpvPlay failed:", e);
}
}, []);
const pause = useCallback(async () => {
console.log("[useMpv] pause called");
try {
await mpvPause();
setState((s) => ({ ...s, isPaused: true }));
} catch (e) {
console.error("[useMpv] mpvPause failed:", e);
}
}, []);
const stop = useCallback(async () => {
console.log("[useMpv] stop called");
try {
await mpvStop();
requestedUrlRef.current = null;
setState(DEFAULT_STATE);
} catch (e) {
console.error("[useMpv] mpvStop failed:", e);
}
}, []);
const seek = useCallback(
async (position: number) => {
console.log("[useMpv] seek position=", position);
// If the seek fails, the next poll puts the real position back.
const positionAt = performance.now();
setState((s) => ({ ...s, position, positionAt }));
const done = seeks.begin();
try {
await mpvSeek(position);
} catch (e) {
console.error("[useMpv] mpvSeek failed:", e);
} finally {
done();
}
},
[seeks]
);
const setVolume = useCallback(
async (volume: number) => {
console.log("[useMpv] setVolume volume=", volume);
userVolumeRef.current = volume;
volumeRef.current = volume;
writeVolumePreference({ volume, preMute: preMuteVolumeRef.current });
setState((s) => ({ ...s, volume }));
const done = volumeChanges.begin();
try {
await mpvSetVolume(volume);
} catch (e) {
console.error("[useMpv] mpvSetVolume failed:", e);
} finally {
done();
}
},
[volumeChanges]
);
// Mute is volume 0; unmuting restores the volume from before the mute.
const toggleMute = useCallback(async () => {
const current = volumeRef.current;
if (current > 0) {
preMuteVolumeRef.current = current;
await setVolume(0);
} else {
await setVolume(preMuteVolumeRef.current > 0 ? preMuteVolumeRef.current : 100);
}
}, [setVolume]);
// Read-only accessor for the sticky last-known position. Callers (e.g.
// a source switch) should prefer this over `state.position` for resume
// points across hard restarts — `state.position` is polled and can read 0
// transiently if a fresh `loadfile` is in flight; `lastKnownPositionRef`
// only ever takes ON forward progress, so it survives the retry window.
const getLastKnownPosition = useCallback(() => lastKnownPositionRef.current, []);
useEffect(() => {
console.log("[useMpv] starting poll interval");
refresh();
pollRef.current = setInterval(refresh, 1000);
return () => {
console.log("[useMpv] clearing poll interval");
Eif (pollRef.current) clearInterval(pollRef.current);
};
}, [refresh]);
// mpv says when the video stops or starts moving, as at a pause, a seek or
// a stall, and when it plays again after a seek. Reading the state then
// keeps the subtitles in time without waiting for the next poll.
useEffect(() => {
const unlistenPromise = listen<{ url: string }>("mpv://state-changed", () => {
if (loadingRef.current) changedWhileLoadingRef.current = true;
else refresh();
});
return () => {
unlistenPromise.then((fn) => fn());
};
}, [refresh]);
const opening = isOpeningStream({
loadPending,
currentUrl: state.currentUrl,
playbackStarted: state.playbackStarted,
firstFrameReady: firstFrameSeen,
error,
failed: loadFailed || openFailed,
reconnecting,
});
return {
state,
error,
fallbackActive: state.fallbackActive,
windowClosedId,
firstFrameReady,
opening,
loadId,
reconnecting,
reconnectAttempt,
buffering,
loadFailed,
openFailed,
recentlyRecovered,
load,
reload,
getLastKnownPosition,
play,
pause,
stop,
seek,
setVolume,
toggleMute,
refresh,
};
};
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