refactor(mediabunny): [PKG-MB-04] isolate typed playback and readiness coordination

packages/artplayer-proxy-mediabunny/ARCHITECTURE.md

@@ -15,19 +15,22 @@ declarations, the factory signature, canvas forwarding, or package entrypoints.
 | `hls-state.ts` | HLS track snapshots, bitrate/name/language values and actual selected track identity |
 | `preflight.ts` | Optional HEAD Range check, historical warning/error policy, cancellation and stale-result guard |
 | `load-session.ts` | Ownership of the pending/active SDK Input, HEAD AbortController, deferred load events and deadline |
-| `MediaBunnyEngine.js` | Current coordinator; connects session cancellation to load, source replacement, errors and destroy |
+| `MediaBunnyEngine.ts` | Load/readiness coordinator, source identity, errors and terminal teardown |
+| `playback.ts` | Playback intent, cancellable play/seek/replacement operations and shared pending audio resume |
+| `readiness.ts` | One metadata publication after both participants, guarded event sequences |
+| `hls-selection.ts` | Source-bound track queries, pairing and active replacement errors |
 | `VideoEngine.js` / `AudioEngine.js` | Current native decoding, rendering, seeking, Web Audio clock and scheduling |
 | `VideoShim.ts` / `EventTarget.ts` | Video-like descriptors, synchronous/Promise forwarding and owned event lifecycle |
 | `shim-values.ts` | Existing volume coercion and synthetic TimeRanges values |
 | `shim-frames.ts` | Synthetic frame callbacks, per-instance RAF ownership and terminal cleanup |
-| `engine-types.ts` / `MediaBunnyEngine.d.ts` | Explicit temporary coordinator boundary while its JavaScript implementation is migrated in MB-04 |
+| `engine-types.ts` / `engine-ports.ts` | Internal shim, coordinator and decoder interfaces |
+| `AudioEngine.d.ts` / `VideoEngine.d.ts` | Temporary boundaries for JS decoders, removed in MB-06/05 |
 | `m3u8.js` | Current ArtPlayer control/setting integration |
 
-The eleven TypeScript modules use strict checking with `skipLibCheck: false` and no
-ambient Node types. The adjacent coordinator declaration is a transitional boundary,
-not proof that the JavaScript coordinator has been checked. Replace it with the actual
-strict implementation before completing MB-04. Remaining JavaScript is explicitly
-scheduled in PKG-MB-04/05/06/07/08.
+The sixteen production TypeScript modules use strict checking with `skipLibCheck: false`
+and no ambient Node types. The coordinator is an actual checked implementation. The two
+adjacent decoder declarations are temporary boundaries, not checking of their JavaScript
+implementations. Remaining JavaScript is scheduled in PKG-MB-05/06/07/08.
 Do not describe the whole package as migrated yet.
 
 The shim keeps its existing own-property order and direct prototype surface because
@@ -40,7 +43,8 @@ EventTarget retains duplicate listeners, first-match removal, live-array `forEac
 mutation semantics, detail identity and listener exceptions during normal dispatch.
 Its terminal state stops callbacks later in a dispatch when a listener destroys the
 shim. Shim teardown closes events in `finally`, even if engine cleanup throws, and
-subsequent teardown is inert. Engine playback/readiness race fixes remain in progress.
+subsequent teardown is inert. Engine teardown attempts input, audio and video cleanup
+even when an earlier release throws, then preserves the first failure.
 
 ## Input and cancellation flow
 
@@ -69,6 +73,32 @@ HLS matching preserves the old case-insensitive `.m3u8` suffix/query/hash rule.
 One explicit InputOptions assertion leaves unsupported values to SDK validation, preserving
 the old error owner rather than silently converting arbitrary inputs.
 
+## Playback and readiness ownership
+
+Playback intent is separate from the temporary paused state during seek. Explicit pause
+cancels pending play and prevents automatic resume; a newer seek settles the old operation
+without allowing its completion or rejection to overwrite current state. Pending play waits
+for the seek completion signal, resolved before optional resume to avoid a cycle.
+A pending AudioContext resume is shared across play-pause-play; only the current operation
+starts video and emits play/playing. Source change and destroy invalidate both operations.
+Cancellation settles the public operation while observing the underlying late result;
+actual late decoder work still belongs to MB-05/06.
+
+Normal play, pause, seek/resume and HLS replacement event order is retained. Before each
+event the coordinator rechecks ownership, since a listener may synchronously pause, seek,
+load another source or destroy. Active play errors reject their Promise and restore paused
+state; active seek errors additionally publish one media error. The synchronous currentTime
+setter observes its otherwise unreturnable rejection; direct engine.seek still rejects.
+Active replacement errors remain visible even after the media object changes. Stale HLS query
+errors are ignored only when their captured source no longer owns the result.
+
+Metadata publishes once after both audio/video participants report; repeated or obsolete
+callbacks cannot ready the current source. A parsed container with neither track fails with
+code 4 and message `Input has no audio or video tracks.` before decoder/AudioContext setup.
+This corrects the old false-ready state; normal valid input event order is preserved.
+Existing-track unsupported-codec handling remains a decoder capability task, not evidence
+that every capability failure has been fixed.
+
 ## Types and dependencies
 
 The locked runtime SDK remains MediaBunny 1.56.1. Its pinned WebCodecs declaration
@@ -101,7 +131,7 @@ The source of historical truth is `refactor/baselines/mb-release.json` and its G
 inputs, not a rebuilt dist. Package-specific evidence and remaining tasks are in
 `refactor/mb-validation.md`. The full refactor plan is at the repository root.
 
-PKG-MB-04 still owns duplicate/trackless readiness, reentrant event sequences and
+PKG-MB-04 covers duplicate/trackless readiness, reentrant event sequences and
 pending play/seek coordination. PKG-MB-05/06 own late frame and audio callbacks,
 including operations already inside decoders at cancellation; releasing Input alone
 does not prove those resources are fully handled. PKG-MB-07 owns HLS UI/selection

packages/artplayer-proxy-mediabunny/dist/artplayer-proxy-mediabunny.js

@@ -4,4 +4,4 @@
  * (c) 2017-2026 Harvey Zhao
  * Released under the MIT License.
  */
-!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerProxyMediabunny=t(),define(function(){return e.artplayerProxyMediabunny})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerProxyMediabunny=t()}(this,function(){"use strict";var e,t=e=>{throw TypeError(e)},i=(e,i,r)=>i.has(e)||t("Cannot "+r),r=(e,t,r)=>(i(e,t,"read from private field"),r?r.call(e):t.get(e));function a(e,t){const i=new Map;return e.filter(e=>{const r=e[t];return void 0===r||!i.has(r)&&i.set(r,1)})}class s{constructor(){var i,r,a;i=this,a=!1,(r=e).has(i)?t("Cannot add the same private member more than once"):r instanceof WeakSet?r.add(i):r.set(i,a),this.listeners=new Map}addEventListener(t,i){r(this,e)||(this.listeners.has(t)||this.listeners.set(t,[]),this.listeners.get(t)?.push(i))}removeEventListener(e,t){const i=this.listeners.get(e);if(!i)return;const r=i.indexOf(t);r>=0&&i.splice(r,1)}emit(t,i){if(r(this,e))return;const a=Object.assign(new Event(t),{detail:i});this.listeners.get(t)?.forEach(t=>{r(this,e)||t(a)})}destroy(){var t,r,a,s;a=!0,i(t=this,r=e,"write to private field"),s?s.call(t,a):r.set(t,a),this.listeners.clear()}}function n(e){if(!e)throw new Error("Assertion failed.")}e=new WeakMap;const o=e=>{const t=(e%360+360)%360;if(0===t||90===t||180===t||270===t)return t;throw new Error(`Invalid rotation ${e}.`)},c=e=>e&&e[e.length-1],l=e=>{let t=0;for(;0===e.readBits(1)&&t<32;)t++;if(t>=32)throw new Error("Invalid exponential-Golomb code.");return(1<<t)-1+e.readBits(t)},u=(e,t)=>{const i=t+1,r=Math.floor(Math.log2(i));e.writeBits(r,0),e.writeBits(1,1),e.writeBits(r,i-2**r)},d=e=>{const t=l(e);return 0===(1&t)?-(t>>1):t+1>>1},h=e=>e.constructor===Uint8Array?e:ArrayBuffer.isView(e)?new Uint8Array(e.buffer,e.byteOffset,e.byteLength):new Uint8Array(e),f=e=>e.constructor===DataView?e:ArrayBuffer.isView(e)?new DataView(e.buffer,e.byteOffset,e.byteLength):new DataView(e),m=new TextDecoder,p=e=>Object.fromEntries(Object.entries(e).map(([e,t])=>[t,e])),g={bt709:1,bt470bg:5,smpte170m:6,bt2020:9,smpte432:12},k=p(g),y={bt709:1,smpte170m:6,linear:8,"iec61966-2-1":13,pq:16,hlg:18},b=p(y),w={rgb:0,bt709:1,bt470bg:5,smpte170m:6,"bt2020-ncl":9},T=p(w),S=e=>!!e&&!!e.primaries&&!!e.transfer&&!!e.matrix&&void 0!==e.fullRange,v={primaries:void 0,transfer:void 0,matrix:void 0,fullRange:void 0},P=e=>e instanceof ArrayBuffer||"undefined"!==typeof SharedArrayBuffer&&e instanceof SharedArrayBuffer||ArrayBuffer.isView(e);class I{constructor(){this.currentPromise=Promise.resolve(),this.pending=0}async acquire(){let e;const t=new Promise(t=>{let i=!1;e=()=>{i||(t(),this.pending--,i=!0)}}),i=this.currentPromise;return this.currentPromise=t,this.pending++,await i,e}}const x=/^[0-9a-fA-F]+$/,C=e=>[...e].map(e=>e.toString(16).padStart(2,"0")).join(""),B=e=>(e=(e=(e=(e=(e=e>>1&1431655765|(1431655765&e)<<1)>>2&858993459|(858993459&e)<<2)>>4&252645135|(252645135&e)<<4)>>8&16711935|(16711935&e)<<8)>>16&65535|(65535&e)<<16)>>>0,E=(e,t,i)=>{let r=0,a=e.length-1,s=-1;for(;r<=a;){const n=r+a>>1,o=i(e[n]);o===t?(s=n,a=n-1):o<t?r=n+1:a=n-1}return s},_=(e,t,i)=>{let r=0,a=e.length-1,s=-1;for(;r<=a;){const n=r+(a-r+1)/2|0;i(e[n])<=t?(s=n,r=n+1):a=n-1}return s},R=(e,t,i)=>{const r=_(e,i(t),i);e.splice(r+1,0,t)},F=()=>{let e,t;return{promise:new Promise((i,r)=>{e=i,t=r}),resolve:e,reject:t}},A=(e,t)=>{const i=e.indexOf(t);-1!==i&&e.splice(i,1)},D=(e,t)=>{for(let i=e.length-1;i>=0;i--)if(t(e[i]))return e[i]},M=(e,t)=>{for(let i=e.length-1;i>=0;i--)if(t(e[i]))return i;return-1},N=e=>{throw new Error(`Unexpected value: ${e}`)},O=(e,t,i)=>{const r=e.getUint8(t),a=e.getUint8(t+1),s=e.getUint8(t+2);return i?r|a<<8|s<<16:r<<16|a<<8|s},L=(e,t,i,r)=>{i>>>=0,i&=16777215,e.setUint8(t,i>>>16&255),e.setUint8(t+1,i>>>8&255),e.setUint8(t+2,255&i)},z=(e,t)=>({async next(){const i=await e.next();return i.done?{value:void 0,done:!0}:{value:t(i.value),done:!1}},return:()=>e.return(),throw:t=>e.throw(t),[Symbol.asyncIterator](){return this}}),U=(e,t,i)=>Math.max(t,Math.min(i,e)),q="und",W=e=>{const t=Math.round(e);return Math.abs(e/t-1)<10*Number.EPSILON?t:e},H=(e,t)=>Math.round(e/t)*t,V=(e,t)=>Math.round(e*t)/t,j=(e,t)=>Math.floor(e/t)*t,K=e=>{let t=0;for(;0!==e;)e&=e-1,t++;return t},X=/^[a-z]{3}$/,$=e=>X.test(e),G=1e6*(1+Number.EPSILON),Q=(e,t)=>{const i={...e,...t};if(e.headers||t.headers){const r=e.headers?Y(e.headers):{},a=t.headers?Y(t.headers):{},s={...r};Object.entries(a).forEach(([e,t])=>{const i=Object.keys(s).find(t=>t.toLowerCase()===e.toLowerCase());i&&delete s[i],s[e]=t}),i.headers=s}return i},Y=e=>{if(e instanceof Headers){const t={};return e.forEach((e,i)=>{t[i]=e}),t}if(Array.isArray(e)){const t={};return e.forEach(([e,i])=>{t[e]=i}),t}return e},J=async(e,t,i,r,a)=>{let s=0;for(;;)try{return await e(t,i)}catch(n){if(a())throw n;s++;const e=r(s,n,t);if(null===e)throw n;if(ve._error("Retrying failed fetch. 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+!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerProxyMediabunny=t(),define(function(){return e.artplayerProxyMediabunny})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerProxyMediabunny=t()}(this,function(){"use strict";var e,t,i=e=>{throw TypeError(e)},r=(e,t,r)=>t.has(e)||i("Cannot "+r),a=(e,t,i)=>(r(e,t,"read from private field"),i?i.call(e):t.get(e)),s=(e,t,r)=>t.has(e)?i("Cannot add the same private member more than once"):t instanceof WeakSet?t.add(e):t.set(e,r),n=(e,t,i,a)=>(r(e,t,"write to private field"),a?a.call(e,i):t.set(e,i),i);function o(e,t){const i=new Map;return e.filter(e=>{const r=e[t];return void 0===r||!i.has(r)&&i.set(r,1)})}class c{constructor(){s(this,e,!1),this.listeners=new Map}addEventListener(t,i){a(this,e)||(this.listeners.has(t)||this.listeners.set(t,[]),this.listeners.get(t)?.push(i))}removeEventListener(e,t){const i=this.listeners.get(e);if(!i)return;const r=i.indexOf(t);r>=0&&i.splice(r,1)}emit(t,i){if(a(this,e))return;const r=Object.assign(new Event(t),{detail:i});this.listeners.get(t)?.forEach(t=>{a(this,e)||t(r)})}destroy(){n(this,e,!0),this.listeners.clear()}}function l(e){if(!e)throw new Error("Assertion failed.")}e=new WeakMap;const u=e=>{const t=(e%360+360)%360;if(0===t||90===t||180===t||270===t)return t;throw new Error(`Invalid rotation ${e}.`)},d=e=>e&&e[e.length-1],h=e=>{let t=0;for(;0===e.readBits(1)&&t<32;)t++;if(t>=32)throw new Error("Invalid exponential-Golomb code.");return(1<<t)-1+e.readBits(t)},f=(e,t)=>{const i=t+1,r=Math.floor(Math.log2(i));e.writeBits(r,0),e.writeBits(1,1),e.writeBits(r,i-2**r)},m=e=>{const t=h(e);return 0===(1&t)?-(t>>1):t+1>>1},p=e=>e.constructor===Uint8Array?e:ArrayBuffer.isView(e)?new Uint8Array(e.buffer,e.byteOffset,e.byteLength):new Uint8Array(e),g=e=>e.constructor===DataView?e:ArrayBuffer.isView(e)?new DataView(e.buffer,e.byteOffset,e.byteLength):new DataView(e),k=new TextDecoder,y=e=>Object.fromEntries(Object.entries(e).map(([e,t])=>[t,e])),b={bt709:1,bt470bg:5,smpte170m:6,bt2020:9,smpte432:12},w=y(b),T={bt709:1,smpte170m:6,linear:8,"iec61966-2-1":13,pq:16,hlg:18},S=y(T),v={rgb:0,bt709:1,bt470bg:5,smpte170m:6,"bt2020-ncl":9},P=y(v),I=e=>!!e&&!!e.primaries&&!!e.transfer&&!!e.matrix&&void 0!==e.fullRange,x={primaries:void 0,transfer:void 0,matrix:void 0,fullRange:void 0},C=e=>e instanceof ArrayBuffer||"undefined"!==typeof SharedArrayBuffer&&e instanceof SharedArrayBuffer||ArrayBuffer.isView(e);class B{constructor(){this.currentPromise=Promise.resolve(),this.pending=0}async acquire(){let e;const t=new Promise(t=>{let i=!1;e=()=>{i||(t(),this.pending--,i=!0)}}),i=this.currentPromise;return this.currentPromise=t,this.pending++,await i,e}}const E=/^[0-9a-fA-F]+$/,_=e=>[...e].map(e=>e.toString(16).padStart(2,"0")).join(""),R=e=>(e=(e=(e=(e=(e=e>>1&1431655765|(1431655765&e)<<1)>>2&858993459|(858993459&e)<<2)>>4&252645135|(252645135&e)<<4)>>8&16711935|(16711935&e)<<8)>>16&65535|(65535&e)<<16)>>>0,F=(e,t,i)=>{let r=0,a=e.length-1,s=-1;for(;r<=a;){const n=r+a>>1,o=i(e[n]);o===t?(s=n,a=n-1):o<t?r=n+1:a=n-1}return s},A=(e,t,i)=>{let r=0,a=e.length-1,s=-1;for(;r<=a;){const n=r+(a-r+1)/2|0;i(e[n])<=t?(s=n,r=n+1):a=n-1}return s},D=(e,t,i)=>{const r=A(e,i(t),i);e.splice(r+1,0,t)},M=()=>{let e,t;return{promise:new Promise((i,r)=>{e=i,t=r}),resolve:e,reject:t}},N=(e,t)=>{const i=e.indexOf(t);-1!==i&&e.splice(i,1)},O=(e,t)=>{for(let i=e.length-1;i>=0;i--)if(t(e[i]))return e[i]},L=(e,t)=>{for(let i=e.length-1;i>=0;i--)if(t(e[i]))return i;return-1},z=e=>{throw new Error(`Unexpected value: ${e}`)},U=(e,t,i)=>{const r=e.getUint8(t),a=e.getUint8(t+1),s=e.getUint8(t+2);return i?r|a<<8|s<<16:r<<16|a<<8|s},q=(e,t,i,r)=>{i>>>=0,i&=16777215,e.setUint8(t,i>>>16&255),e.setUint8(t+1,i>>>8&255),e.setUint8(t+2,255&i)},W=(e,t)=>({async next(){const i=await e.next();return i.done?{value:void 0,done:!0}:{value:t(i.value),done:!1}},return:()=>e.return(),throw:t=>e.throw(t),[Symbol.asyncIterator](){return this}}),H=(e,t,i)=>Math.max(t,Math.min(i,e)),V="und",j=e=>{const t=Math.round(e);return Math.abs(e/t-1)<10*Number.EPSILON?t:e},K=(e,t)=>Math.round(e/t)*t,X=(e,t)=>Math.round(e*t)/t,$=(e,t)=>Math.floor(e/t)*t,G=e=>{let t=0;for(;0!==e;)e&=e-1,t++;return t},Q=/^[a-z]{3}$/,Y=e=>Q.test(e),J=1e6*(1+Number.EPSILON),Z=(e,t)=>{const i={...e,...t};if(e.headers||t.headers){const r=e.headers?ee(e.headers):{},a=t.headers?ee(t.headers):{},s={...r};Object.entries(a).forEach(([e,t])=>{const i=Object.keys(s).find(t=>t.toLowerCase()===e.toLowerCase());i&&delete s[i],s[e]=t}),i.headers=s}return i},ee=e=>{if(e instanceof Headers){const t={};return e.forEach((e,i)=>{t[i]=e}),t}if(Array.isArray(e)){const t={};return e.forEach(([e,i])=>{t[e]=i}),t}return e},te=async(e,t,i,r,a)=>{let s=0;for(;;)try{return await e(t,i)}catch(n){if(a())throw n;s++;const e=r(s,n,t);if(null===e)throw n;if(xe._error("Retrying failed fetch. 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packages/artplayer-proxy-mediabunny/dist/artplayer-proxy-mediabunny.legacy.js

@@ -4,4 +4,4 @@
  * (c) 2017-2026 Harvey Zhao
  * Released under the MIT License.
  */
-!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerProxyMediabunny=t(),define(function(){return e.artplayerProxyMediabunny})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerProxyMediabunny=t()}(this,function(){"use strict";var e,t=Object.defineProperty,i=Object.defineProperties,r=Object.getOwnPropertyDescriptors,n=Object.getOwnPropertySymbols,s=Object.prototype.hasOwnProperty,a=Object.prototype.propertyIsEnumerable,o=(e,t)=>(t=Symbol[e])?t:Symbol.for("Symbol."+e),l=e=>{throw TypeError(e)},c=Math.pow,u=(e,i,r)=>i in e?t(e,i,{enumerable:!0,configurable:!0,writable:!0,value:r}):e[i]=r,d=(e,t)=>{for(var i in t||(t={}))s.call(t,i)&&u(e,i,t[i]);if(n)for(var i of n(t))a.call(t,i)&&u(e,i,t[i]);return e},h=(e,t)=>i(e,r(t)),f=(e,t,i)=>t.has(e)||l("Cannot "+i),m=(e,t,i)=>(f(e,t,"read from private field"),i?i.call(e):t.get(e)),p=(e,t,i)=>new Promise((r,n)=>{var 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t,i,r,n;r=!0,f(t=this,i=e,"write to private field"),n?n.call(t,r):i.set(t,r),this.listeners.clear()}}function S(e){if(!e)throw new Error("Assertion failed.")}e=new WeakMap;const w=e=>{const t=(e%360+360)%360;if(0===t||90===t||180===t||270===t)return t;throw new Error(`Invalid rotation ${e}.`)},P=e=>e&&e[e.length-1],I=e=>{let t=0;for(;0===e.readBits(1)&&t<32;)t++;if(t>=32)throw new Error("Invalid exponential-Golomb code.");return(1<<t)-1+e.readBits(t)},x=(e,t)=>{const i=t+1,r=Math.floor(Math.log2(i));e.writeBits(r,0),e.writeBits(1,1),e.writeBits(r,i-c(2,r))},C=e=>{const t=I(e);return 0===(1&t)?-(t>>1):t+1>>1},B=e=>e.constructor===Uint8Array?e:ArrayBuffer.isView(e)?new Uint8Array(e.buffer,e.byteOffset,e.byteLength):new Uint8Array(e),E=e=>e.constructor===DataView?e:ArrayBuffer.isView(e)?new DataView(e.buffer,e.byteOffset,e.byteLength):new DataView(e),_=new 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W=/^[0-9a-fA-F]+$/,H=e=>[...e].map(e=>e.toString(16).padStart(2,"0")).join(""),V=e=>(e=(e=(e=(e=(e=e>>1&1431655765|(1431655765&e)<<1)>>2&858993459|(858993459&e)<<2)>>4&252645135|(252645135&e)<<4)>>8&16711935|(16711935&e)<<8)>>16&65535|(65535&e)<<16)>>>0,j=(e,t,i)=>{let r=0,n=e.length-1,s=-1;for(;r<=n;){const a=r+n>>1,o=i(e[a]);o===t?(s=a,n=a-1):o<t?r=a+1:n=a-1}return s},Line truncated
+!function(e,t){"object"===typeof exports&&"undefined"!==typeof module?module.exports=t():"function"==typeof define&&define.amd?(e.artplayerProxyMediabunny=t(),define(function(){return e.artplayerProxyMediabunny})):(e="undefined"!==typeof globalThis?globalThis:e||self).artplayerProxyMediabunny=t()}(this,function(){"use strict";var e,t,i=Object.defineProperty,r=Object.defineProperties,n=Object.getOwnPropertyDescriptors,s=Object.getOwnPropertySymbols,a=Object.prototype.hasOwnProperty,o=Object.prototype.propertyIsEnumerable,l=(e,t)=>(t=Symbol[e])?t:Symbol.for("Symbol."+e),c=e=>{throw TypeError(e)},u=Math.pow,d=(e,t,r)=>t in e?i(e,t,{enumerable:!0,configurable:!0,writable:!0,value:r}):e[t]=r,h=(e,t)=>{for(var i in t||(t={}))a.call(t,i)&&d(e,i,t[i]);if(s)for(var i of s(t))o.call(t,i)&&d(e,i,t[i]);return e},f=(e,t)=>r(e,n(t)),m=(e,t,i)=>t.has(e)||c("Cannot "+i),p=(e,t,i)=>(m(e,t,"read from private field"),i?i.call(e):t.get(e)),g=(e,t,i)=>t.has(e)?c("Cannot add the same private member more 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packages/artplayer-proxy-mediabunny/dist/artplayer-proxy-mediabunny.mjs

@@ -11,7 +11,7 @@ var __accessCheck = (obj, member, msg) => member.has(obj) || __typeError("Cannot
 var __privateGet = (obj, member, getter) => (__accessCheck(obj, member, "read from private field"), getter ? getter.call(obj) : member.get(obj));
 var __privateAdd = (obj, member, value) => member.has(obj) ? __typeError("Cannot add the same private member more than once") : member instanceof WeakSet ? member.add(obj) : member.set(obj, value);
 var __privateSet = (obj, member, value, setter) => (__accessCheck(obj, member, "write to private field"), setter ? setter.call(obj, value) : member.set(obj, value), value);
-var _closed;
+var _closed, _playback;
 const $audio = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" height="18"><path fill="#fff" d="M256 80C149.9 80 62.4 159.4 49.6 262c9.4-3.8 19.6-6 30.4-6c26.5 0 48 21.5 48 48l0 128c0 26.5-21.5 48-48 48c-44.2 0-80-35.8-80-80l0-16 0-48 0-48C0 146.6 114.6 32 256 32s256 114.6 256 256l0 48 0 48 0 16c0 44.2-35.8 80-80 80c-26.5 0-48-21.5-48-48l0-128c0-26.5 21.5-48 48-48c10.8 0 21 2.1 30.4 6C449.6 159.4 362.1 80 256 80z"/></svg>';
 const $quality = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" height="18"><path fill="#fff" d="M0 96C0 60.7 28.7 32 64 32l384 0c35.3 0 64 28.7 64 64l0 320c0 35.3-28.7 64-64 64L64 480c-35.3 0-64-28.7-64-64L0 96zM323.8 202.5c-4.5-6.6-11.9-10.5-19.8-10.5s-15.4 3.9-19.8 10.5l-87 127.6L170.7 297c-4.6-5.7-11.5-9-18.7-9s-14.2 3.3-18.7 9l-64 80c-5.8 7.2-6.9 17.1-2.9 25.4s12.4 13.6 21.6 13.6l96 0 32 0 208 0c8.9 0 17.1-4.9 21.2-12.8s3.6-17.4-1.4-24.7l-120-176zM112 192a48 48 0 1 0 0-96 48 48 0 1 0 0 96z"/></svg>';
 function uniqBy(array, property) {
@@ -24271,6 +24271,62 @@ class AudioEngine {
     this.audioSink = null;
   }
 }
+async function selectQuality(host, value) {
+  const { input, media, loadSeq } = host;
+  if (!media?.isHls || !input || host.destroyed)
+    return;
+  const current = () => !host.destroyed && host.loadSeq === loadSeq && host.input === input && host.media === media;
+  let selection;
+  try {
+    const tracks = await input.getVideoTracks();
+    if (!current())
+      return;
+    const videoTrack = value === "auto" ? await input.getPrimaryVideoTrack() : tracks.find((track) => track.id === value) ?? media.videoTrack;
+    if (!current() || !videoTrack)
+      return;
+    let audioTrack = media.audioTrack;
+    let audioMode = media.audioMode;
+    if (!audioTrack || !videoTrack.canBePairedWith(audioTrack)) {
+      audioTrack = await videoTrack.getPrimaryPairableAudioTrack();
+      audioMode = "auto";
+    }
+    selection = { videoTrack, audioTrack, videoMode: value === "auto" ? "auto" : "manual", audioMode };
+  } catch (error) {
+    if (!current())
+      return;
+    throw error;
+  }
+  if (current())
+    await host.replaceTracks(selection);
+}
+async function selectAudio(host, value) {
+  const { input, media, loadSeq } = host;
+  if (!media?.isHls || !input || host.destroyed)
+    return;
+  const current = () => !host.destroyed && host.loadSeq === loadSeq && host.input === input && host.media === media;
+  let selection;
+  try {
+    const tracks = await input.getAudioTracks();
+    if (!current())
+      return;
+    const audioTrack = value === "auto" ? media.videoTrack ? await media.videoTrack.getPrimaryPairableAudioTrack() : await input.getPrimaryAudioTrack() : tracks.find((track) => track.id === value) ?? media.audioTrack;
+    if (!current() || !audioTrack)
+      return;
+    let videoTrack = media.videoTrack;
+    let videoMode = media.videoMode;
+    if (!videoTrack || !audioTrack.canBePairedWith(videoTrack)) {
+      videoTrack = await audioTrack.getPrimaryPairableVideoTrack();
+      videoMode = "auto";
+    }
+    selection = { videoTrack, audioTrack, videoMode, audioMode: value === "auto" ? "auto" : "manual" };
+  } catch (error) {
+    if (!current())
+      return;
+    throw error;
+  }
+  if (current())
+    await host.replaceTracks(selection);
+}
 async function getTrackBitrate(track) {
   return await track.getAverageBitrate() ?? await track.getBitrate() ?? 0;
 }
@@ -24404,6 +24460,30 @@ class LoadSession {
     this.disposeInput();
   }
 }
+function publish(events, current, names) {
+  for (const name of names) {
+    if (!current())
+      return;
+    events.emit(name);
+  }
+}
+function metadataBarrier(ready, current) {
+  let video = false;
+  let audio = false;
+  let published = false;
+  function complete(part) {
+    if (!current() || published)
+      return;
+    if (part === "video")
+      video = true;
+    else audio = true;
+    if (video && audio) {
+      published = true;
+      ready();
+    }
+  }
+  return { video: () => complete("video"), audio: () => complete("audio") };
+}
 async function resolveDuration({ input, videoTrack, audioTrack }) {
   const tracks = [videoTrack, audioTrack].filter((track) => track !== null);
   const referenceTrack = videoTrack || audioTrack;
@@ -24433,6 +24513,212 @@ async function selectPlaybackTracks(input, src) {
     audioMode: isHls ? "auto" : "manual"
   };
 }
+function completion() {
+  let resolve;
+  let reject;
+  const promise = new Promise((yes, no) => {
+    resolve = yes;
+    reject = no;
+  });
+  return { promise, resolve, reject };
+}
+class Playback {
+  constructor(host) {
+    this.host = host;
+    this.wanted = false;
+    this.playing = null;
+    this.seeking = null;
+    this.audioStart = null;
+  }
+  operation() {
+    return { ...completion(), source: this.host.loadSeq, complete: completion() };
+  }
+  current(operation, kind) {
+    return !this.host.destroyed && operation.source === this.host.loadSeq && this[kind] === operation;
+  }
+  cancelPlay() {
+    const previous = this.playing;
+    this.playing = null;
+    previous?.resolve();
+  }
+  invalidate() {
+    this.cancelPlay();
+    this.wanted = false;
+    const previous = this.seeking;
+    this.seeking = null;
+    previous?.complete.resolve();
+    previous?.resolve();
+    this.host.seeking = false;
+  }
+  ended() {
+    this.wanted = false;
+    this.cancelPlay();
+  }
+  stop() {
+    if (this.host.paused)
+      return;
+    this.host.paused = true;
+    this.stopEngines();
+    this.host.events.emit("pause");
+  }
+  stopEngines() {
+    const failures = [];
+    for (const stop of [() => this.host.audio.pause(), () => this.host.video.stop()]) {
+      try {
+        stop();
+      } catch (error) {
+        failures.push(error);
+      }
+    }
+    if (failures.length)
+      throw failures[0];
+  }
+  pause() {
+    this.wanted = false;
+    this.cancelPlay();
+    this.stop();
+  }
+  play() {
+    if (this.host.destroyed)
+      return Promise.resolve();
+    this.wanted = true;
+    if (this.playing)
+      return this.playing.promise;
+    if (this.host.ended)
+      return this.seek(0, true);
+    if (!this.host.paused && !this.seeking)
+      return Promise.resolve();
+    const operation = this.operation();
+    this.playing = operation;
+    this.runPlay(operation).then(operation.resolve, operation.reject);
+    return operation.promise;
+  }
+  async startAudio() {
+    if (!this.audioStart)
+      this.audioStart = this.host.audio.play();
+    const pending = this.audioStart;
+    try {
+      await pending;
+    } finally {
+      if (this.audioStart === pending)
+        this.audioStart = null;
+    }
+  }
+  async runPlay(operation) {
+    const current = () => this.current(operation, "playing") && this.wanted;
+    try {
+      while (this.seeking) {
+        await this.seeking.complete.promise;
+        if (!current())
+          return;
+      }
+      if (!current())
+        return;
+      this.host.paused = false;
+      await this.startAudio();
+      if (!current()) {
+        if (!this.wanted || this.host.destroyed)
+          this.host.audio.pause();
+        return;
+      }
+      this.host.video.start(this.host.audio);
+      publish(this.host.events, current, ["play", "playing"]);
+    } catch (error) {
+      if (!current())
+        return;
+      this.wanted = false;
+      this.host.paused = true;
+      try {
+        this.stopEngines();
+      } catch (failure) {
+        console.warn("MediaBunny play cleanup error:", failure);
+      }
+      throw error;
+    } finally {
+      if (this.playing === operation)
+        this.playing = null;
+    }
+  }
+  seek(time, resume) {
+    return this.position(async (current) => {
+      const audio = this.host.audio.seek(time);
+      const video = current() ? this.host.video.seek(time) : Promise.resolve();
+      await Promise.all([audio, video]);
+    }, ["seeked"], false, resume);
+  }
+  replace(media, time) {
+    return this.position(async (current) => {
+      media.duration = await resolveDuration(media);
+      if (!current())
+        return;
+      this.host.media = media;
+      await Promise.all([this.host.video.load(media), this.host.audio.load(media)]);
+      if (!current())
+        return;
+      await Promise.all([this.host.video.seek(time), this.host.audio.seek(time)]);
+      if (current()) {
+        this.host.readyState = 4;
+        this.host.networkState = 1;
+      }
+    }, ["loadedmetadata", "durationchange", "progress", "loadeddata", "canplay", "canplaythrough", "seeked"], true);
+  }
+  position(work, events, pauseFirst, resume) {
+    if (this.host.destroyed)
+      return Promise.resolve();
+    this.wanted = resume ?? (this.seeking ? this.wanted : !this.host.paused);
+    this.cancelPlay();
+    const previous = this.seeking;
+    const operation = this.operation();
+    this.seeking = operation;
+    previous?.complete.resolve();
+    previous?.resolve();
+    this.runPosition(operation, work, events, pauseFirst).then(operation.resolve, operation.reject);
+    return operation.promise;
+  }
+  async runPosition(operation, work, events, pauseFirst) {
+    const current = () => this.current(operation, "seeking");
+    let resume = false;
+    try {
+      if (pauseFirst)
+        this.stop();
+      if (!current())
+        return;
+      this.host.ended = false;
+      this.host.seeking = true;
+      publish(this.host.events, current, ["seeking", "waiting"]);
+      if (!current())
+        return;
+      if (!pauseFirst)
+        this.stop();
+      if (!current())
+        return;
+      await work(current);
+      if (!current())
+        return;
+      this.host.seeking = false;
+      operation.complete.resolve();
+      publish(this.host.events, current, events);
+      if (!current())
+        return;
+      this.seeking = null;
+      resume = this.wanted;
+    } catch (error) {
+      if (!current())
+        return;
+      this.host.seeking = false;
+      this.wanted = false;
+      this.cancelPlay();
+      this.host.reportError(error);
+      throw error;
+    } finally {
+      operation.complete.resolve();
+      if (this.seeking === operation)
+        this.seeking = null;
+    }
+    if (resume)
+      await this.play();
+  }
+}
 async function preflightRange(url, enabled, events, signal, isCurrent = () => true) {
   if (signal?.aborted || !isCurrent())
     return false;
@@ -24661,6 +24947,7 @@ class VideoEngine {
 }
 class MediaBunnyEngine {
   constructor({ canvas, ctx, events, option = {} }) {
+    __privateAdd(this, _playback);
     this.events = events;
     this.option = option;
     this.audio = new AudioEngine(events);
@@ -24685,15 +24972,20 @@ class MediaBunnyEngine {
     this.media = null;
     this.loadSession = null;
     this.destroyed = false;
-    events.addEventListener?.("ended", () => {
+    __privateSet(this, _playback, new Playback(this));
+    events.addEventListener("ended", () => {
+      if (this.destroyed)
+        return;
       this.ended = true;
       this.paused = true;
+      __privateGet(this, _playback).ended();
     });
   }
   async load(src) {
     if (this.destroyed)
       return;
     const id = ++this.loadSeq;
+    __privateGet(this, _playback).invalidate();
     this.loadSession?.cancel();
     if (id !== this.loadSeq || this.destroyed)
       return;
@@ -24709,75 +25001,62 @@ class MediaBunnyEngine {
     this.readyState = 0;
     session.defer(() => this.events.emit("waiting"));
     session.defer(() => this.events.emit("loadstart"));
-    const loadTimeout = Number.isFinite(this.option.loadTimeout) ? this.option.loadTimeout : 0;
+    const timeout = Number.isFinite(this.option.loadTimeout) ? this.option.loadTimeout ?? 0 : 0;
     try {
-      await session.wait(this.performLoad(src, id, session), loadTimeout);
-    } catch (err) {
+      await session.wait(this.performLoad(src, id, session), timeout);
+    } catch (error) {
       if (id !== this.loadSeq)
         return;
       const failed = ++this.loadSeq;
+      __privateGet(this, _playback).invalidate();
       session.cancel();
       if (failed !== this.loadSeq || this.destroyed)
         return;
       this.disposeInput();
-      this.error = { code: 4, message: err.message };
-      this.networkState = 3;
-      this.events.emit("error");
+      this.reportError(error);
     }
   }
   async performLoad(src, id, session = this.loadSession) {
-    if (!await this.video.preflight(src, session?.signal, () => id === this.loadSeq) || id !== this.loadSeq)
+    const current = () => !this.destroyed && id === this.loadSeq;
+    if (!session || !await this.video.preflight(src, session.signal, current) || !current())
       return;
     const input = createInput(src);
     if (!input) {
       this.video.handleNoVideoTrack();
-      this.audio.handleNoAudioTrack();
+      if (current())
+        this.audio.handleNoAudioTrack();
       return;
     }
     session.own(input);
     const media = await selectPlaybackTracks(input, src);
-    if (id !== this.loadSeq)
+    if (!current())
       return;
+    if (!media.videoTrack && !media.audioTrack) {
+      this.video.handleNoVideoTrack();
+      this.video.duration = Number.NaN;
+      this.audio.duration = Number.NaN;
+      throw new Error("Input has no audio or video tracks.");
+    }
     this.input = input;
     this.media = media;
-    let videoMetadataLoaded = !media.videoTrack;
-    let audioMetadataLoaded = !media.audioTrack;
-    const checkMetadata = () => {
-      if (videoMetadataLoaded && audioMetadataLoaded) {
-        this.readyState = 1;
-        this.events.emit("loadedmetadata");
-        this.events.emit("durationchange");
-        this.events.emit("progress");
-      }
-    };
+    const metadata = metadataBarrier(() => {
+      this.readyState = 1;
+      publish(this.events, current, ["loadedmetadata", "durationchange", "progress"]);
+    }, current);
     try {
-      await Promise.all([
-        this.video.load(media, () => {
-          if (id !== this.loadSeq)
-            return;
-          videoMetadataLoaded = true;
-          checkMetadata();
-        }),
-        this.audio.load(media, () => {
-          if (id !== this.loadSeq)
-            return;
-          audioMetadataLoaded = true;
-          checkMetadata();
-        })
-      ]);
-      if (id !== this.loadSeq)
+      const video = this.video.load(media, metadata.video);
+      const audio = current() ? this.audio.load(media, metadata.audio) : Promise.resolve();
+      await Promise.all([video, audio]);
+      if (!current())
         return;
       this.readyState = 4;
       this.networkState = 1;
-      this.events.emit("loadeddata");
-      this.events.emit("canplay");
-      this.events.emit("canplaythrough");
-      this.events.emit("progress");
-    } catch (err) {
-      if (id !== this.loadSeq)
+      publish(this.events, current, ["loadeddata", "canplay", "canplaythrough", "progress"]);
+    } catch (error) {
+      if (!current())
         return;
-      console.error("MediaBunny load error:", err);
-      throw err;
+      console.error("MediaBunny load error:", error);
+      throw error;
     }
   }
   createTimeout(ms) {
@@ -24790,127 +25069,38 @@ class MediaBunnyEngine {
     this.input = null;
     this.media = null;
   }
-  async replaceTracks({ videoTrack, audioTrack, videoMode, audioMode }) {
-    if (!this.media)
+  async replaceTracks(tracks) {
+    if (!this.media || this.destroyed)
       return;
-    const nextMedia = {
-      ...this.media,
-      videoTrack,
-      audioTrack,
-      videoMode,
-      audioMode
-    };
-    const shouldResume = !this.paused;
-    const currentTime = this.currentTime;
-    this.pause();
-    this.ended = false;
-    this.seeking = true;
-    this.events.emit("seeking");
-    this.events.emit("waiting");
-    nextMedia.duration = await resolveDuration(nextMedia);
-    this.media = nextMedia;
-    await Promise.all([
-      this.video.load(nextMedia),
-      this.audio.load(nextMedia)
-    ]);
-    await Promise.all([
-      this.video.seek(currentTime),
-      this.audio.seek(currentTime)
-    ]);
-    this.readyState = 4;
-    this.networkState = 1;
-    this.seeking = false;
-    this.events.emit("loadedmetadata");
-    this.events.emit("durationchange");
-    this.events.emit("progress");
-    this.events.emit("loadeddata");
-    this.events.emit("canplay");
-    this.events.emit("canplaythrough");
-    this.events.emit("seeked");
-    if (shouldResume) {
-      await this.play();
-    }
+    return __privateGet(this, _playback).replace({ ...this.media, ...tracks }, this.currentTime);
   }
   async selectHlsQuality(value) {
-    if (!this.media?.isHls || !this.input)
-      return;
-    const videoTracks = await this.input.getVideoTracks();
-    const videoTrack = value === "auto" ? await this.input.getPrimaryVideoTrack() : videoTracks.find((track) => track.id === value) ?? this.media.videoTrack;
-    if (!videoTrack)
-      return;
-    let audioTrack = this.media.audioTrack;
-    let audioMode = this.media.audioMode;
-    if (!audioTrack || !videoTrack.canBePairedWith(audioTrack)) {
-      audioTrack = await videoTrack.getPrimaryPairableAudioTrack();
-      audioMode = "auto";
-    }
-    await this.replaceTracks({
-      videoTrack,
-      audioTrack,
-      videoMode: value === "auto" ? "auto" : "manual",
-      audioMode
-    });
+    return selectQuality(this, value);
   }
   async selectHlsAudio(value) {
-    if (!this.media?.isHls || !this.input)
-      return;
-    const audioTracks = await this.input.getAudioTracks();
-    const audioTrack = value === "auto" ? this.media.videoTrack ? await this.media.videoTrack.getPrimaryPairableAudioTrack() : await this.input.getPrimaryAudioTrack() : audioTracks.find((track) => track.id === value) ?? this.media.audioTrack;
-    if (!audioTrack)
-      return;
-    let videoTrack = this.media.videoTrack;
-    let videoMode = this.media.videoMode;
-    if (!videoTrack || !audioTrack.canBePairedWith(videoTrack)) {
-      videoTrack = await audioTrack.getPrimaryPairableVideoTrack();
-      videoMode = "auto";
-    }
-    await this.replaceTracks({
-      videoTrack,
-      audioTrack,
-      videoMode,
-      audioMode: value === "auto" ? "auto" : "manual"
-    });
+    return selectAudio(this, value);
   }
-  getHlsState() {
-    return getHlsState(this.media);
+  async getHlsState() {
+    const media = this.media;
+    if (this.destroyed)
+      return null;
+    try {
+      const state2 = await getHlsState(media);
+      return !this.destroyed && this.media === media ? state2 : null;
+    } catch (error) {
+      if (this.destroyed || this.media !== media)
+        return null;
+      throw error;
+    }
   }
   async play() {
-    if (!this.paused)
-      return;
-    if (this.ended) {
-      this.ended = false;
-      await this.seek(0);
-    }
-    this.paused = false;
-    await this.audio.play();
-    this.video.start(this.audio);
-    this.events.emit("play");
-    this.events.emit("playing");
+    return __privateGet(this, _playback).play();
   }
   pause() {
-    if (this.paused)
-      return;
-    this.paused = true;
-    this.audio.pause();
-    this.video.stop();
-    this.events.emit("pause");
+    __privateGet(this, _playback).pause();
   }
   async seek(time) {
-    const shouldResume = !this.paused;
-    this.ended = false;
-    this.seeking = true;
-    this.events.emit("seeking");
-    this.events.emit("waiting");
-    this.pause();
-    await Promise.all([
-      this.audio.seek(time),
-      this.video.seek(time)
-    ]);
-    this.seeking = false;
-    this.events.emit("seeked");
-    if (shouldResume && !this.ended) {
-      await this.play();
-    }
+    return __privateGet(this, _playback).seek(time);
   }
   setVolume(volume, muted) {
     this.audio.setVolume(volume, muted);
@@ -24919,18 +25109,31 @@ class MediaBunnyEngine {
     this.audio.setPlaybackRate(rate);
     this.video.setPlaybackRate(rate);
   }
+  reportError(error) {
+    if (this.destroyed)
+      return;
+    const message = error && typeof error === "object" ? Reflect.get(error, "message") : void 0;
+    this.error = { code: 4, message: typeof message === "string" ? message : String(error) };
+    this.networkState = 3;
+    this.events.emit("error");
+  }
   destroy() {
     if (this.destroyed)
       return;
     this.destroyed = true;
     this.loadSeq++;
-    this.loadSession?.cancel();
-    this.pause();
-    this.disposeInput();
-    this.audio.destroy();
-    this.video.destroy();
+    __privateGet(this, _playback).invalidate();
+    const failures = [];
+    for (const release of [() => this.loadSession?.cancel(), () => this.pause(), () => this.disposeInput(), () => this.audio.destroy(), () => this.video.destroy()]) {
+      try {
+        release();
+      } catch (error) {
+        failures.push(error);
+      }
+    }
+    if (failures.length)
+      throw failures[0];
   }
-  // Getters
   get currentTime() {
     return this.audio.currentTime;
   }
@@ -24944,6 +25147,7 @@ class MediaBunnyEngine {
     return this.video.height;
   }
 }
+_playback = new WeakMap();
 const states = /* @__PURE__ */ new WeakMap();
 function state(owner) {
   let value = states.get(owner);
@@ -25049,7 +25253,8 @@ class VideoShim {
     return this.engine.currentTime;
   }
   set currentTime(t) {
-    this.engine.seek(Number(t) || 0);
+    void Promise.resolve(this.engine.seek(Number(t) || 0)).catch(() => {
+    });
   }
   get duration() {
     return this.engine.duration;

packages/artplayer-proxy-mediabunny/src/AudioEngine.d.ts

@@ -0,0 +1,6 @@
+import type { AudioPort } from './engine-ports'
+import type EventTarget from './EventTarget'
+
+// Exact coordinator-facing port; implementation migration and decoder ownership are MB-06.
+declare const AudioEngine: new (events: EventTarget) => AudioPort
+export default AudioEngine

packages/artplayer-proxy-mediabunny/src/MediaBunnyEngine.d.ts

@@ -1,4 +0,0 @@
-import type { EngineOptions, EnginePort } from './engine-types'
-
-declare const MediaBunnyEngine: new (options: EngineOptions) => EnginePort
-export default MediaBunnyEngine

packages/artplayer-proxy-mediabunny/src/MediaBunnyEngine.js

@@ -1,372 +0,0 @@
-/**
- * Main MediaBunny Engine
- * Coordinates audio and video playback
- */
-import AudioEngine from './AudioEngine.js'
-import { getHlsState } from './hls-state'
-import { createInput } from './input'
-import LoadSession from './load-session'
-import { resolveDuration, selectPlaybackTracks } from './tracks'
-import VideoEngine from './VideoEngine.js'
-
-export default class MediaBunnyEngine {
-  constructor({ canvas, ctx, events, option = {} }) {
-    this.events = events
-    this.option = option
-
-    // Create audio and video engines
-    this.audio = new AudioEngine(events)
-    this.video = new VideoEngine({
-      canvas,
-      ctx,
-      events,
-      timeupdateInterval: option.timeupdateInterval ?? 250,
-      avSyncTolerance: option.avSyncTolerance ?? 0.12,
-      dropLateFrames: option.dropLateFrames ?? false,
-      poster: option.poster ?? '',
-      preflightRange: option.preflightRange ?? false,
-    })
-
-    // Playback state
-    this.paused = true
-    this.ended = false
-    this.readyState = 0
-    this.networkState = 0
-    this.error = null
-    this.seeking = false
-    this.loadSeq = 0
-    this.input = null
-    this.media = null
-    this.loadSession = null
-    this.destroyed = false
-
-    // Listen to ended event
-    events.addEventListener?.('ended', () => {
-      this.ended = true
-      this.paused = true
-    })
-  }
-
-  async load(src) {
-    if (this.destroyed)
-      return
-    const id = ++this.loadSeq
-    this.loadSession?.cancel()
-    if (id !== this.loadSeq || this.destroyed)
-      return
-    this.pause()
-    if (id !== this.loadSeq || this.destroyed)
-      return
-    this.disposeInput()
-    const session = new LoadSession()
-    this.loadSession = session
-    this.ended = false
-    this.error = null
-    this.networkState = 2 // NETWORK_LOADING
-    this.readyState = 0 // HAVE_NOTHING
-
-    session.defer(() => this.events.emit('waiting'))
-    session.defer(() => this.events.emit('loadstart'))
-
-    const loadTimeout = Number.isFinite(this.option.loadTimeout)
-      ? this.option.loadTimeout
-      : 0
-
-    try {
-      await session.wait(this.performLoad(src, id, session), loadTimeout)
-    }
-    catch (err) {
-      if (id !== this.loadSeq)
-        return
-
-      const failed = ++this.loadSeq
-      session.cancel()
-      if (failed !== this.loadSeq || this.destroyed)
-        return
-      this.disposeInput()
-      this.error = { code: 4, message: err.message }
-      this.networkState = 3 // NETWORK_NO_SOURCE
-      this.events.emit('error')
-    }
-  }
-
-  async performLoad(src, id, session = this.loadSession) {
-    if (!(await this.video.preflight(src, session?.signal, () => id === this.loadSeq)) || id !== this.loadSeq)
-      return
-
-    const input = createInput(src)
-    if (!input) {
-      this.video.handleNoVideoTrack()
-      this.audio.handleNoAudioTrack()
-      return
-    }
-    session.own(input)
-    const media = await selectPlaybackTracks(input, src)
-    if (id !== this.loadSeq)
-      return
-    this.input = input
-    this.media = media
-
-    let videoMetadataLoaded = !media.videoTrack
-    let audioMetadataLoaded = !media.audioTrack
-
-    const checkMetadata = () => {
-      if (videoMetadataLoaded && audioMetadataLoaded) {
-        this.readyState = 1 // HAVE_METADATA
-        this.events.emit('loadedmetadata')
-        this.events.emit('durationchange')
-        this.events.emit('progress')
-      }
-    }
-
-    try {
-      await Promise.all([
-        this.video.load(media, () => {
-          if (id !== this.loadSeq)
-            return
-          videoMetadataLoaded = true
-          checkMetadata()
-        }),
-        this.audio.load(media, () => {
-          if (id !== this.loadSeq)
-            return
-          audioMetadataLoaded = true
-          checkMetadata()
-        }),
-      ])
-
-      if (id !== this.loadSeq)
-        return
-
-      this.readyState = 4 // HAVE_ENOUGH_DATA
-      this.networkState = 1 // NETWORK_IDLE
-      this.events.emit('loadeddata')
-      this.events.emit('canplay')
-      this.events.emit('canplaythrough')
-      this.events.emit('progress')
-    }
-    catch (err) {
-      if (id !== this.loadSeq)
-        return
-
-      console.error('MediaBunny load error:', err)
-      throw err
-    }
-  }
-
-  createTimeout(ms) {
-    return new Promise((_, reject) => {
-      setTimeout(() => reject(new Error('Load timeout')), ms)
-    })
-  }
-
-  disposeInput() {
-    this.loadSession?.disposeInput()
-    this.input = null
-    this.media = null
-  }
-
-  async replaceTracks({ videoTrack, audioTrack, videoMode, audioMode }) {
-    if (!this.media)
-      return
-
-    const nextMedia = {
-      ...this.media,
-      videoTrack,
-      audioTrack,
-      videoMode,
-      audioMode,
-    }
-
-    const shouldResume = !this.paused
-    const currentTime = this.currentTime
-
-    this.pause()
-    this.ended = false
-    this.seeking = true
-    this.events.emit('seeking')
-    this.events.emit('waiting')
-
-    nextMedia.duration = await resolveDuration(nextMedia)
-    this.media = nextMedia
-
-    await Promise.all([
-      this.video.load(nextMedia),
-      this.audio.load(nextMedia),
-    ])
-
-    await Promise.all([
-      this.video.seek(currentTime),
-      this.audio.seek(currentTime),
-    ])
-
-    this.readyState = 4
-    this.networkState = 1
-    this.seeking = false
-    this.events.emit('loadedmetadata')
-    this.events.emit('durationchange')
-    this.events.emit('progress')
-    this.events.emit('loadeddata')
-    this.events.emit('canplay')
-    this.events.emit('canplaythrough')
-    this.events.emit('seeked')
-
-    if (shouldResume) {
-      await this.play()
-    }
-  }
-
-  async selectHlsQuality(value) {
-    if (!this.media?.isHls || !this.input)
-      return
-
-    const videoTracks = await this.input.getVideoTracks()
-    const videoTrack = value === 'auto'
-      ? await this.input.getPrimaryVideoTrack()
-      : videoTracks.find(track => track.id === value) ?? this.media.videoTrack
-
-    if (!videoTrack)
-      return
-
-    let audioTrack = this.media.audioTrack
-    let audioMode = this.media.audioMode
-
-    if (!audioTrack || !videoTrack.canBePairedWith(audioTrack)) {
-      audioTrack = await videoTrack.getPrimaryPairableAudioTrack()
-      audioMode = 'auto'
-    }
-
-    await this.replaceTracks({
-      videoTrack,
-      audioTrack,
-      videoMode: value === 'auto' ? 'auto' : 'manual',
-      audioMode,
-    })
-  }
-
-  async selectHlsAudio(value) {
-    if (!this.media?.isHls || !this.input)
-      return
-
-    const audioTracks = await this.input.getAudioTracks()
-    const audioTrack = value === 'auto'
-      ? this.media.videoTrack
-        ? await this.media.videoTrack.getPrimaryPairableAudioTrack()
-        : await this.input.getPrimaryAudioTrack()
-      : audioTracks.find(track => track.id === value) ?? this.media.audioTrack
-
-    if (!audioTrack)
-      return
-
-    let videoTrack = this.media.videoTrack
-    let videoMode = this.media.videoMode
-
-    if (!videoTrack || !audioTrack.canBePairedWith(videoTrack)) {
-      videoTrack = await audioTrack.getPrimaryPairableVideoTrack()
-      videoMode = 'auto'
-    }
-
-    await this.replaceTracks({
-      videoTrack,
-      audioTrack,
-      videoMode,
-      audioMode: value === 'auto' ? 'auto' : 'manual',
-    })
-  }
-
-  getHlsState() {
-    return getHlsState(this.media)
-  }
-
-  async play() {
-    if (!this.paused)
-      return
-
-    if (this.ended) {
-      this.ended = false
-      await this.seek(0)
-    }
-
-    this.paused = false
-
-    await this.audio.play()
-    this.video.start(this.audio)
-
-    this.events.emit('play')
-    this.events.emit('playing')
-  }
-
-  pause() {
-    if (this.paused)
-      return
-
-    this.paused = true
-
-    this.audio.pause()
-    this.video.stop()
-
-    this.events.emit('pause')
-  }
-
-  async seek(time) {
-    const shouldResume = !this.paused
-
-    this.ended = false
-    this.seeking = true
-
-    this.events.emit('seeking')
-    this.events.emit('waiting')
-
-    this.pause()
-
-    await Promise.all([
-      this.audio.seek(time),
-      this.video.seek(time),
-    ])
-
-    this.seeking = false
-    this.events.emit('seeked')
-
-    if (shouldResume && !this.ended) {
-      await this.play()
-    }
-  }
-
-  setVolume(volume, muted) {
-    this.audio.setVolume(volume, muted)
-  }
-
-  setPlaybackRate(rate) {
-    this.audio.setPlaybackRate(rate)
-    this.video.setPlaybackRate(rate)
-  }
-
-  destroy() {
-    if (this.destroyed)
-      return
-    this.destroyed = true
-    this.loadSeq++
-    this.loadSession?.cancel()
-    this.pause()
-    this.disposeInput()
-    this.audio.destroy()
-    this.video.destroy()
-  }
-
-  // Getters
-  get currentTime() {
-    return this.audio.currentTime
-  }
-
-  get duration() {
-    return this.media?.duration ?? this.audio.duration ?? this.video.duration
-  }
-
-  get videoWidth() {
-    return this.video.width
-  }
-
-  get videoHeight() {
-    return this.video.height
-  }
-}

packages/artplayer-proxy-mediabunny/src/MediaBunnyEngine.ts

@@ -0,0 +1,255 @@
+import type { Input } from 'mediabunny'
+import type { AudioPort, VideoPort } from './engine-ports'
+import type { EngineOptions, EnginePort, ProxyOptions } from './engine-types'
+import type EventTarget from './EventTarget'
+import type { SelectedTracks } from './hls-selection'
+import type { PlaybackMedia } from './media'
+import AudioEngine from './AudioEngine.js'
+import { selectAudio, selectQuality } from './hls-selection'
+import { getHlsState } from './hls-state'
+import { createInput } from './input'
+import LoadSession from './load-session'
+import Playback from './playback'
+import { metadataBarrier, publish } from './readiness'
+import { selectPlaybackTracks } from './tracks'
+import VideoEngine from './VideoEngine.js'
+
+export default class MediaBunnyEngine implements EnginePort {
+  declare events: EventTarget
+  declare option: ProxyOptions
+  declare audio: AudioPort
+  declare video: VideoPort
+  declare paused: boolean
+  declare ended: boolean
+  declare readyState: number
+  declare networkState: number
+  declare error: { code: number, message: string } | null
+  declare seeking: boolean
+  declare loadSeq: number
+  declare input: Input | null
+  declare media: PlaybackMedia | null
+  declare loadSession: LoadSession | null
+  declare destroyed: boolean
+  #playback: Playback
+
+  constructor({ canvas, ctx, events, option = {} }: EngineOptions) {
+    this.events = events
+    this.option = option
+    this.audio = new AudioEngine(events)
+    this.video = new VideoEngine({
+      canvas,
+      ctx,
+      events,
+      timeupdateInterval: option.timeupdateInterval ?? 250,
+      avSyncTolerance: option.avSyncTolerance ?? 0.12,
+      dropLateFrames: option.dropLateFrames ?? false,
+      poster: option.poster ?? '',
+      preflightRange: option.preflightRange ?? false,
+    })
+    this.paused = true
+    this.ended = false
+    this.readyState = 0
+    this.networkState = 0
+    this.error = null
+    this.seeking = false
+    this.loadSeq = 0
+    this.input = null
+    this.media = null
+    this.loadSession = null
+    this.destroyed = false
+    this.#playback = new Playback(this)
+    events.addEventListener('ended', () => {
+      if (this.destroyed)
+        return
+      this.ended = true
+      this.paused = true
+      this.#playback.ended()
+    })
+  }
+
+  async load(src: unknown): Promise<void> {
+    if (this.destroyed)
+      return
+    const id = ++this.loadSeq
+    this.#playback.invalidate()
+    this.loadSession?.cancel()
+    if (id !== this.loadSeq || this.destroyed)
+      return
+    this.pause()
+    if (id !== this.loadSeq || this.destroyed)
+      return
+    this.disposeInput()
+    const session = new LoadSession()
+    this.loadSession = session
+    this.ended = false
+    this.error = null
+    this.networkState = 2
+    this.readyState = 0
+    session.defer(() => this.events.emit('waiting'))
+    session.defer(() => this.events.emit('loadstart'))
+    const timeout = Number.isFinite(this.option.loadTimeout) ? this.option.loadTimeout ?? 0 : 0
+    try {
+      await session.wait(this.performLoad(src, id, session), timeout)
+    }
+    catch (error) {
+      if (id !== this.loadSeq)
+        return
+      const failed = ++this.loadSeq
+      this.#playback.invalidate()
+      session.cancel()
+      if (failed !== this.loadSeq || this.destroyed)
+        return
+      this.disposeInput()
+      this.reportError(error)
+    }
+  }
+
+  async performLoad(src: unknown, id: number, session = this.loadSession): Promise<void> {
+    const current = () => !this.destroyed && id === this.loadSeq
+    if (!session || !(await this.video.preflight(src, session.signal, current)) || !current())
+      return
+    const input = createInput(src)
+    if (!input) {
+      this.video.handleNoVideoTrack()
+      if (current())
+        this.audio.handleNoAudioTrack()
+      return
+    }
+    session.own(input)
+    const media = await selectPlaybackTracks(input, src)
+    if (!current())
+      return
+    if (!media.videoTrack && !media.audioTrack) {
+      this.video.handleNoVideoTrack()
+      this.video.duration = Number.NaN
+      this.audio.duration = Number.NaN
+      throw new Error('Input has no audio or video tracks.')
+    }
+    this.input = input
+    this.media = media
+    const metadata = metadataBarrier(() => {
+      this.readyState = 1
+      publish(this.events, current, ['loadedmetadata', 'durationchange', 'progress'])
+    }, current)
+    try {
+      const video = this.video.load(media, metadata.video)
+      const audio = current() ? this.audio.load(media, metadata.audio) : Promise.resolve()
+      await Promise.all([video, audio])
+      if (!current())
+        return
+      this.readyState = 4
+      this.networkState = 1
+      publish(this.events, current, ['loadeddata', 'canplay', 'canplaythrough', 'progress'])
+    }
+    catch (error) {
+      if (!current())
+        return
+      console.error('MediaBunny load error:', error)
+      throw error
+    }
+  }
+
+  createTimeout(ms: number): Promise<never> {
+    return new Promise((_, reject) => {
+      setTimeout(() => reject(new Error('Load timeout')), ms)
+    })
+  }
+
+  disposeInput(): void {
+    this.loadSession?.disposeInput()
+    this.input = null
+    this.media = null
+  }
+
+  async replaceTracks(tracks: SelectedTracks): Promise<void> {
+    if (!this.media || this.destroyed)
+      return
+    return this.#playback.replace({ ...this.media, ...tracks }, this.currentTime)
+  }
+
+  async selectHlsQuality(value: unknown): Promise<void> {
+    return selectQuality(this, value)
+  }
+
+  async selectHlsAudio(value: unknown): Promise<void> {
+    return selectAudio(this, value)
+  }
+
+  async getHlsState() {
+    const media = this.media
+    if (this.destroyed)
+      return null
+    try {
+      const state = await getHlsState(media)
+      return !this.destroyed && this.media === media ? state : null
+    }
+    catch (error) {
+      if (this.destroyed || this.media !== media)
+        return null
+      throw error
+    }
+  }
+
+  async play(): Promise<void> {
+    return this.#playback.play()
+  }
+
+  pause(): void {
+    this.#playback.pause()
+  }
+
+  async seek(time: number): Promise<void> {
+    return this.#playback.seek(time)
+  }
+
+  setVolume(volume: number, muted: boolean): void {
+    this.audio.setVolume(volume, muted)
+  }
+
+  setPlaybackRate(rate: number): void {
+    this.audio.setPlaybackRate(rate)
+    this.video.setPlaybackRate(rate)
+  }
+
+  reportError(error: unknown): void {
+    if (this.destroyed)
+      return
+    const message: unknown = error && typeof error === 'object' ? Reflect.get(error, 'message') : undefined
+    this.error = { code: 4, message: typeof message === 'string' ? message : String(error) }
+    this.networkState = 3
+    this.events.emit('error')
+  }
+
+  destroy(): void {
+    if (this.destroyed)
+      return
+    this.destroyed = true
+    this.loadSeq++
+    this.#playback.invalidate()
+    const failures: unknown[] = []
+    for (const release of [() => this.loadSession?.cancel(), () => this.pause(), () => this.disposeInput(), () => this.audio.destroy(), () => this.video.destroy()]) {
+      try {
+        release()
+      }
+      catch (error) { failures.push(error) }
+    }
+    if (failures.length)
+      throw failures[0]
+  }
+
+  get currentTime(): number {
+    return this.audio.currentTime
+  }
+
+  get duration(): number {
+    return this.media?.duration ?? this.audio.duration ?? this.video.duration
+  }
+
+  get videoWidth(): number {
+    return this.video.width
+  }
+
+  get videoHeight(): number {
+    return this.video.height
+  }
+}

packages/artplayer-proxy-mediabunny/src/VideoEngine.d.ts

@@ -0,0 +1,5 @@
+import type { VideoOptions, VideoPort } from './engine-ports'
+
+// Exact coordinator-facing port; implementation migration and frame ownership are MB-05.
+declare const VideoEngine: new (options: VideoOptions) => VideoPort
+export default VideoEngine

packages/artplayer-proxy-mediabunny/src/VideoShim.ts

@@ -87,7 +87,8 @@ export default class VideoShim {
   }
 
   set currentTime(t: unknown) {
-    this.engine.seek(Number(t) || 0)
+    // The coordinator reports active failures; the synchronous setter must observe rejection.
+    void Promise.resolve(this.engine.seek(Number(t) || 0)).catch(() => {})
   }
 
   get duration() {

packages/artplayer-proxy-mediabunny/src/engine-ports.ts

@@ -0,0 +1,60 @@
+import type { Input } from 'mediabunny'
+import type { ProxyOptions } from './engine-types'
+import type EventTarget from './EventTarget'
+import type { PlaybackMedia } from './media'
+
+export interface AudioPort {
+  readonly currentTime: number
+  duration: number
+  paused: boolean
+  load: (media: PlaybackMedia, metadata?: () => void) => Promise<void>
+  play: () => Promise<void>
+  pause: () => void
+  seek: (time: number) => Promise<void>
+  setVolume: (volume: number, muted: boolean) => void
+  setPlaybackRate: (rate: number) => void
+  handleNoAudioTrack: () => void
+  destroy: () => void
+}
+
+export interface VideoPort {
+  width: number
+  height: number
+  duration: number
+  preflight: (source: unknown, signal?: AbortSignal, current?: () => boolean) => Promise<boolean>
+  load: (media: PlaybackMedia, metadata?: () => void) => Promise<void>
+  start: (clock: AudioPort) => void
+  stop: () => void
+  seek: (time: number) => Promise<void>
+  setPlaybackRate: (rate: number) => void
+  handleNoVideoTrack: () => void
+  destroy: () => void
+}
+
+export interface VideoOptions {
+  canvas: HTMLCanvasElement
+  ctx: CanvasRenderingContext2D | null
+  events: EventTarget
+  timeupdateInterval: number
+  avSyncTolerance: number
+  dropLateFrames: boolean
+  poster: string
+  preflightRange: boolean
+}
+
+export interface PlaybackHost {
+  audio: AudioPort
+  video: VideoPort
+  events: EventTarget
+  readonly destroyed: boolean
+  readonly loadSeq: number
+  paused: boolean
+  ended: boolean
+  seeking: boolean
+  readyState: number
+  networkState: number
+  media: PlaybackMedia | null
+  input: Input | null
+  option: ProxyOptions
+  reportError: (error: unknown) => void
+}

packages/artplayer-proxy-mediabunny/src/engine-types.ts

@@ -19,7 +19,7 @@ export interface EngineOptions {
   option?: ProxyOptions
 }
 
-// Transitional boundary for the coordinator; replaced by its strict implementation in MB-04.
+// Stable coordinator-facing surface used by the public shim.
 export interface EnginePort {
   readonly currentTime: number
   readonly duration: number

packages/artplayer-proxy-mediabunny/src/hls-selection.ts

@@ -0,0 +1,74 @@
+import type { Input } from 'mediabunny'
+import type { PlaybackMedia } from './media'
+
+export type SelectedTracks = Pick<PlaybackMedia, 'videoTrack' | 'audioTrack' | 'videoMode' | 'audioMode'>
+
+interface SelectionHost {
+  input: Input | null
+  media: PlaybackMedia | null
+  destroyed: boolean
+  loadSeq: number
+  replaceTracks: (tracks: SelectedTracks) => Promise<void>
+}
+
+export async function selectQuality(host: SelectionHost, value: unknown): Promise<void> {
+  const { input, media, loadSeq } = host
+  if (!media?.isHls || !input || host.destroyed)
+    return
+  const current = () => !host.destroyed && host.loadSeq === loadSeq && host.input === input && host.media === media
+  let selection: SelectedTracks
+  try {
+    const tracks = await input.getVideoTracks()
+    if (!current())
+      return
+    const videoTrack = value === 'auto' ? await input.getPrimaryVideoTrack() : tracks.find(track => track.id === value) ?? media.videoTrack
+    if (!current() || !videoTrack)
+      return
+    let audioTrack = media.audioTrack
+    let audioMode = media.audioMode
+    if (!audioTrack || !videoTrack.canBePairedWith(audioTrack)) {
+      audioTrack = await videoTrack.getPrimaryPairableAudioTrack()
+      audioMode = 'auto'
+    }
+    selection = { videoTrack, audioTrack, videoMode: value === 'auto' ? 'auto' : 'manual', audioMode }
+  }
+  catch (error) {
+    if (!current())
+      return
+    throw error
+  }
+  if (current())
+    await host.replaceTracks(selection)
+}
+
+export async function selectAudio(host: SelectionHost, value: unknown): Promise<void> {
+  const { input, media, loadSeq } = host
+  if (!media?.isHls || !input || host.destroyed)
+    return
+  const current = () => !host.destroyed && host.loadSeq === loadSeq && host.input === input && host.media === media
+  let selection: SelectedTracks
+  try {
+    const tracks = await input.getAudioTracks()
+    if (!current())
+      return
+    const audioTrack = value === 'auto'
+      ? media.videoTrack ? await media.videoTrack.getPrimaryPairableAudioTrack() : await input.getPrimaryAudioTrack()
+      : tracks.find(track => track.id === value) ?? media.audioTrack
+    if (!current() || !audioTrack)
+      return
+    let videoTrack = media.videoTrack
+    let videoMode = media.videoMode
+    if (!videoTrack || !audioTrack.canBePairedWith(videoTrack)) {
+      videoTrack = await audioTrack.getPrimaryPairableVideoTrack()
+      videoMode = 'auto'
+    }
+    selection = { videoTrack, audioTrack, videoMode, audioMode: value === 'auto' ? 'auto' : 'manual' }
+  }
+  catch (error) {
+    if (!current())
+      return
+    throw error
+  }
+  if (current())
+    await host.replaceTracks(selection)
+}

packages/artplayer-proxy-mediabunny/src/playback.ts

@@ -0,0 +1,240 @@
+import type { PlaybackHost } from './engine-ports'
+import type { PlaybackMedia } from './media'
+import { publish } from './readiness'
+import { resolveDuration } from './tracks'
+
+interface Completion {
+  promise: Promise<void>
+  resolve: () => void
+  reject: (error: unknown) => void
+}
+
+interface Operation extends Completion {
+  source: number
+  complete: Completion
+}
+
+function completion(): Completion {
+  let resolve!: () => void
+  let reject!: (error: unknown) => void
+  const promise = new Promise<void>((yes, no) => {
+    resolve = yes
+    reject = no
+  })
+  return { promise, resolve, reject }
+}
+
+export default class Playback {
+  private wanted = false
+  private playing: Operation | null = null
+  private seeking: Operation | null = null
+  private audioStart: Promise<void> | null = null
+
+  constructor(private host: PlaybackHost) {}
+
+  private operation(): Operation {
+    return { ...completion(), source: this.host.loadSeq, complete: completion() }
+  }
+
+  private current(operation: Operation, kind: 'playing' | 'seeking'): boolean {
+    return !this.host.destroyed && operation.source === this.host.loadSeq && this[kind] === operation
+  }
+
+  private cancelPlay(): void {
+    const previous = this.playing
+    this.playing = null
+    previous?.resolve()
+  }
+
+  invalidate(): void {
+    this.cancelPlay()
+    this.wanted = false
+    const previous = this.seeking
+    this.seeking = null
+    previous?.complete.resolve()
+    previous?.resolve()
+    this.host.seeking = false
+  }
+
+  ended(): void {
+    this.wanted = false
+    this.cancelPlay()
+  }
+
+  private stop(): void {
+    if (this.host.paused)
+      return
+    this.host.paused = true
+    this.stopEngines()
+    this.host.events.emit('pause')
+  }
+
+  private stopEngines(): void {
+    const failures: unknown[] = []
+    for (const stop of [() => this.host.audio.pause(), () => this.host.video.stop()]) {
+      try {
+        stop()
+      }
+      catch (error) { failures.push(error) }
+    }
+    if (failures.length)
+      throw failures[0]
+  }
+
+  pause(): void {
+    this.wanted = false
+    this.cancelPlay()
+    this.stop()
+  }
+
+  play(): Promise<void> {
+    if (this.host.destroyed)
+      return Promise.resolve()
+    this.wanted = true
+    if (this.playing)
+      return this.playing.promise
+    if (this.host.ended)
+      return this.seek(0, true)
+    if (!this.host.paused && !this.seeking)
+      return Promise.resolve()
+    const operation = this.operation()
+    this.playing = operation
+    this.runPlay(operation).then(operation.resolve, operation.reject)
+    return operation.promise
+  }
+
+  private async startAudio(): Promise<void> {
+    if (!this.audioStart)
+      this.audioStart = this.host.audio.play()
+    const pending = this.audioStart
+    try {
+      await pending
+    }
+    finally {
+      if (this.audioStart === pending)
+        this.audioStart = null
+    }
+  }
+
+  private async runPlay(operation: Operation): Promise<void> {
+    const current = () => this.current(operation, 'playing') && this.wanted
+    try {
+      while (this.seeking) {
+        await this.seeking.complete.promise
+        if (!current())
+          return
+      }
+      if (!current())
+        return
+      this.host.paused = false
+      await this.startAudio()
+      if (!current()) {
+        if (!this.wanted || this.host.destroyed)
+          this.host.audio.pause()
+        return
+      }
+      this.host.video.start(this.host.audio)
+      publish(this.host.events, current, ['play', 'playing'])
+    }
+    catch (error) {
+      if (!current())
+        return
+      this.wanted = false
+      this.host.paused = true
+      try {
+        this.stopEngines()
+      }
+      catch (failure) { console.warn('MediaBunny play cleanup error:', failure) }
+      throw error
+    }
+    finally {
+      if (this.playing === operation)
+        this.playing = null
+    }
+  }
+
+  seek(time: number, resume?: boolean): Promise<void> {
+    return this.position(async (current) => {
+      const audio = this.host.audio.seek(time)
+      const video = current() ? this.host.video.seek(time) : Promise.resolve()
+      await Promise.all([audio, video])
+    }, ['seeked'], false, resume)
+  }
+
+  replace(media: PlaybackMedia, time: number): Promise<void> {
+    return this.position(async (current) => {
+      media.duration = await resolveDuration(media)
+      if (!current())
+        return
+      this.host.media = media
+      await Promise.all([this.host.video.load(media), this.host.audio.load(media)])
+      if (!current())
+        return
+      await Promise.all([this.host.video.seek(time), this.host.audio.seek(time)])
+      if (current()) {
+        this.host.readyState = 4
+        this.host.networkState = 1
+      }
+    }, ['loadedmetadata', 'durationchange', 'progress', 'loadeddata', 'canplay', 'canplaythrough', 'seeked'], true)
+  }
+
+  private position(work: (current: () => boolean) => Promise<void>, events: readonly string[], pauseFirst: boolean, resume?: boolean): Promise<void> {
+    if (this.host.destroyed)
+      return Promise.resolve()
+    this.wanted = resume ?? (this.seeking ? this.wanted : !this.host.paused)
+    this.cancelPlay()
+    const previous = this.seeking
+    const operation = this.operation()
+    this.seeking = operation
+    previous?.complete.resolve()
+    previous?.resolve()
+    this.runPosition(operation, work, events, pauseFirst).then(operation.resolve, operation.reject)
+    return operation.promise
+  }
+
+  private async runPosition(operation: Operation, work: (current: () => boolean) => Promise<void>, events: readonly string[], pauseFirst: boolean): Promise<void> {
+    const current = () => this.current(operation, 'seeking')
+    let resume = false
+    try {
+      if (pauseFirst)
+        this.stop()
+      if (!current())
+        return
+      this.host.ended = false
+      this.host.seeking = true
+      publish(this.host.events, current, ['seeking', 'waiting'])
+      if (!current())
+        return
+      if (!pauseFirst)
+        this.stop()
+      if (!current())
+        return
+      await work(current)
+      if (!current())
+        return
+      this.host.seeking = false
+      operation.complete.resolve()
+      publish(this.host.events, current, events)
+      if (!current())
+        return
+      this.seeking = null
+      resume = this.wanted
+    }
+    catch (error) {
+      if (!current())
+        return
+      this.host.seeking = false
+      this.wanted = false
+      this.cancelPlay()
+      this.host.reportError(error)
+      throw error
+    }
+    finally {
+      operation.complete.resolve()
+      if (this.seeking === operation)
+        this.seeking = null
+    }
+    if (resume)
+      await this.play()
+  }
+}

packages/artplayer-proxy-mediabunny/src/readiness.ts

@@ -0,0 +1,27 @@
+import type EventTarget from './EventTarget'
+
+export function publish(events: EventTarget, current: () => boolean, names: readonly string[]): void {
+  for (const name of names) {
+    if (!current())
+      return
+    events.emit(name)
+  }
+}
+
+export function metadataBarrier(ready: () => void, current: () => boolean) {
+  let video = false
+  let audio = false
+  let published = false
+  function complete(part: 'audio' | 'video'): void {
+    if (!current() || published)
+      return
+    if (part === 'video')
+      video = true
+    else audio = true
+    if (video && audio) {
+      published = true
+      ready()
+    }
+  }
+  return { video: () => complete('video'), audio: () => complete('audio') }
+}