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refactor(mediabunny): [PKG-MB-05] own video iterators, frame pools and rendering
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Harvey Zhao committed
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@@ -19,18 +19,22 @@ declarations, the factory signature, canvas forwarding, or package entrypoints.
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| `playback.ts` | Playback intent, cancellable play/seek/replacement operations and shared pending audio resume |
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| `readiness.ts` | One metadata publication after both participants, guarded event sequences |
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| `hls-selection.ts` | Source-bound track queries, pairing and active replacement errors |
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| `VideoEngine.js` / `AudioEngine.js` | Current native decoding, rendering, seeking, Web Audio clock and scheduling |
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| `VideoEngine.ts` | Video capability/setup, source and seek ownership, first frames and terminal cleanup |
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| `video-frames.ts` | Shared pending iterator reads, idempotent iterator release and existing frame timing policy |
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| `video-renderer.ts` | Owned RAF, stale frame rejection, clock-driven draw/stall/end events |
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| `video-poster.ts` | Per-request image callbacks, source guards and handler cleanup |
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| `AudioEngine.js` | Remaining Web Audio clock, audio decoding and scheduling implementation |
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| `VideoShim.ts` / `EventTarget.ts` | Video-like descriptors, synchronous/Promise forwarding and owned event lifecycle |
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| `shim-values.ts` | Existing volume coercion and synthetic TimeRanges values |
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| `shim-frames.ts` | Synthetic frame callbacks, per-instance RAF ownership and terminal cleanup |
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| `engine-types.ts` / `engine-ports.ts` | Internal shim, coordinator and decoder interfaces |
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| `AudioEngine.d.ts` / `VideoEngine.d.ts` | Temporary boundaries for JS decoders, removed in MB-06/05 |
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| `AudioEngine.d.ts` | Temporary boundary for the remaining JS audio engine, removed in MB-06 |
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| `m3u8.js` | Current ArtPlayer control/setting integration |
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The sixteen production TypeScript modules use strict checking with `skipLibCheck: false`
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and no ambient Node types. The coordinator is an actual checked implementation. The two
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adjacent decoder declarations are temporary boundaries, not checking of their JavaScript
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implementations. Remaining JavaScript is scheduled in PKG-MB-05/06/07/08.
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The twenty production TypeScript modules use strict checking with `skipLibCheck: false`
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and no ambient Node types. The coordinator and video engine are checked implementations.
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The adjacent audio declaration is a temporary boundary, not checking of its JavaScript
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implementation. Remaining JavaScript is scheduled in PKG-MB-06/07/08.
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Do not describe the whole package as migrated yet.
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The shim keeps its existing own-property order and direct prototype surface because
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@@ -82,7 +86,7 @@ for the seek completion signal, resolved before optional resume to avoid a cycle
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A pending AudioContext resume is shared across play-pause-play; only the current operation
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starts video and emits play/playing. Source change and destroy invalidate both operations.
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Cancellation settles the public operation while observing the underlying late result;
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actual late decoder work still belongs to MB-05/06.
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video frame ownership is detailed below; remaining audio work belongs to MB-06.
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Normal play, pause, seek/resume and HLS replacement event order is retained. Before each
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event the coordinator rechecks ownership, since a listener may synchronously pause, seek,
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@@ -99,6 +103,43 @@ This corrects the old false-ready state; normal valid input event order is prese
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Existing-track unsupported-codec handling remains a decoder capability task, not evidence
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that every capability failure has been fixed.
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## Video frame ownership
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VideoEngine keeps source/load generation separate from seek iteration and renderer activity.
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A new source calls cancelPending before track selection starts, so an old seek cannot draw
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while the new source is still parsing. Seek during capability detection waits for that load
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without canceling its metadata; only the latest seek may install or draw its frames.
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Ordinary paused seek still displays its first target frame and queues the second.
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Iterator detachment is synchronous. The old return Promise is observed without blocking a
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new load on obsolete reads; repeated release calls return the same cleanup Promise. Late
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completion cannot clear the current iterator or its fetching flag. Stop/start shares an
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already pending next() for the same iterator instead of issuing concurrent reads. Pause
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invalidates render work; it does not cancel a legitimate paused seek's target frame.
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Each seek after the initial iterator creates a fresh CanvasSink with its own two-canvas pool.
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Concurrent obsolete decoders can otherwise overwrite the pixels of a queued frame even when
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the proxy discards their returned objects. Sink identity is internal and may change on seek;
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public canvas identity stays stable. Tests intercept sink prototypes to follow new instances.
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CanvasSink retains poolSize 2, contain fit and track transparency. Its implementation closes
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VideoSample after drawing into the pooled canvas. The proxy releases iterators and references;
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WrappedCanvas is not a VideoFrame and must not receive close(). Default dropLateFrames remains
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false, with the same tolerance/rate formula when enabled. Start preserves the queued second
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frame until it is consumed instead of replacing it through premature prefetch. There is no
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added frame copy.
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Each renderer owns one RAF, including ID zero. Stop/destroy and event-listener reentry make
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queued callbacks inert; an instance that never scheduled a frame cannot cancel another
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instance's frame. Normal timeupdate, stall recovery and ended ordering is preserved, while
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reentrant pause/source/destroy/restart stops the obsolete event sequence. Poster image
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callbacks have source and request identity and are detached on replacement, draw or destroy.
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Background decoder failure stops rendering and reports one media error through the coordinator,
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even if audio cleanup fails. Iterator cleanup failures are observed and warned; explicit
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stopIterator still rejects. Missing 2D context fails at use with a descriptive error, rather
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than becoming falsely ready. Capability handling for existing undecodable tracks remains
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under MB-CAP-01/MB-READY-01; the current no-video fallback is preserved for that separate review.
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## Types and dependencies
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The locked runtime SDK remains MediaBunny 1.56.1. Its pinned WebCodecs declaration
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@@ -118,6 +159,7 @@ node node_modules/typescript/bin/tsc -p packages/artplayer-proxy-mediabunny/tsco
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yarn build artplayer-proxy-mediabunny
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yarn test:browser test/browser/mediabunny-inputs.spec.js test/browser/mediabunny.spec.js test/browser/mediabunny-load.spec.js
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yarn test:browser test/browser/mediabunny-shim.spec.js
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yarn test:browser test/browser/mediabunny-video.spec.js
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```
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Node tests use actual SDK parsing and controlled lifecycle interleavings. Browser tests
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@@ -4,4 +4,4 @@
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* (c) 2017-2026 Harvey Zhao
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* Released under the MIT License.
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*/
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+1
-1
@@ -4,4 +4,4 @@
|
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* (c) 2017-2026 Harvey Zhao
|
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* Released under the MIT License.
|
||||
*/
|
||||
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|
||||
+450
-148
@@ -11,7 +11,16 @@ 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, _playback;
|
||||
var __privateMethod = (obj, member, method) => (__accessCheck(obj, member, "access private method"), method);
|
||||
var __privateWrapper = (obj, member, setter, getter) => ({
|
||||
set _(value) {
|
||||
__privateSet(obj, member, value, setter);
|
||||
},
|
||||
get _() {
|
||||
return __privateGet(obj, member, getter);
|
||||
}
|
||||
});
|
||||
var _closed, _generation, _iteration, _loading, _createSink, _usedSink, _destroyed, _preparing, _poster, _renderer, _onError, _VideoEngine_instances, current_fn, context_fn, report_fn, release_fn, draw_fn, load_fn, reset_fn, _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) {
|
||||
@@ -24741,17 +24750,240 @@ async function preflightRange(url, enabled, events, signal, isCurrent = () => tr
|
||||
return true;
|
||||
}
|
||||
}
|
||||
const closing = /* @__PURE__ */ new WeakMap();
|
||||
const reading = /* @__PURE__ */ new WeakMap();
|
||||
function releaseIterator(iterator) {
|
||||
if (!iterator)
|
||||
return Promise.resolve();
|
||||
const previous = closing.get(iterator);
|
||||
if (previous)
|
||||
return previous;
|
||||
const pending = Promise.resolve().then(() => iterator.return()).then(() => {
|
||||
});
|
||||
closing.set(iterator, pending);
|
||||
return pending;
|
||||
}
|
||||
function readCanvas(iterator) {
|
||||
const previous = reading.get(iterator);
|
||||
if (previous)
|
||||
return previous;
|
||||
const pending = Promise.resolve().then(() => iterator.next()).then((result) => result.value ?? null);
|
||||
reading.set(iterator, pending);
|
||||
const clear = () => {
|
||||
if (reading.get(iterator) === pending)
|
||||
reading.delete(iterator);
|
||||
};
|
||||
pending.then(clear, clear);
|
||||
return pending;
|
||||
}
|
||||
function frameAction(timestamp, time, dropLateFrames, avSyncTolerance, playbackRate) {
|
||||
const tolerance = dropLateFrames ? Math.max(0.06, avSyncTolerance / Math.max(1, playbackRate)) : 0;
|
||||
if (dropLateFrames && timestamp < time - tolerance)
|
||||
return "skip";
|
||||
return timestamp <= time + tolerance ? "draw" : "queue";
|
||||
}
|
||||
class Poster {
|
||||
constructor() {
|
||||
this.image = null;
|
||||
}
|
||||
cancel() {
|
||||
if (!this.image)
|
||||
return;
|
||||
this.image.onload = null;
|
||||
this.image.onerror = null;
|
||||
this.image = null;
|
||||
}
|
||||
draw(source, current, draw, failure) {
|
||||
this.cancel();
|
||||
const image = new Image();
|
||||
this.image = image;
|
||||
image.onload = () => {
|
||||
if (this.image !== image || !current())
|
||||
return;
|
||||
this.cancel();
|
||||
try {
|
||||
draw(image);
|
||||
} catch (error) {
|
||||
failure(error);
|
||||
}
|
||||
};
|
||||
image.onerror = () => {
|
||||
if (this.image === image)
|
||||
this.cancel();
|
||||
};
|
||||
image.src = source;
|
||||
}
|
||||
}
|
||||
class Renderer {
|
||||
constructor(host, ready, draw, failure) {
|
||||
this.host = host;
|
||||
this.ready = ready;
|
||||
this.draw = draw;
|
||||
this.failure = failure;
|
||||
this.stopped = false;
|
||||
this.closed = false;
|
||||
this.scheduled = null;
|
||||
this.fetching = null;
|
||||
}
|
||||
current(id) {
|
||||
return !this.closed && !this.stopped && this.host.asyncId === id;
|
||||
}
|
||||
async update(id) {
|
||||
const iterator = this.host.videoIterator;
|
||||
if (!iterator || !this.ready() || !this.current(id) || this.host.isFetching)
|
||||
return;
|
||||
const request = {};
|
||||
this.fetching = request;
|
||||
this.host.isFetching = true;
|
||||
const current = () => this.current(id) && this.host.videoIterator === iterator;
|
||||
try {
|
||||
while (current()) {
|
||||
const frame = await readCanvas(iterator);
|
||||
if (!current() || !frame)
|
||||
return;
|
||||
const time = this.host.audioClock?.currentTime;
|
||||
if (time === void 0)
|
||||
return;
|
||||
const action = frameAction(frame.timestamp, time, this.host.dropLateFrames, this.host.avSyncTolerance, this.host.playbackRate);
|
||||
if (action === "skip")
|
||||
continue;
|
||||
if (action === "draw") {
|
||||
this.draw(frame);
|
||||
} else {
|
||||
this.host.nextFrame = frame;
|
||||
return;
|
||||
}
|
||||
}
|
||||
} catch (error) {
|
||||
if (current())
|
||||
throw error;
|
||||
} finally {
|
||||
if (this.fetching === request) {
|
||||
this.fetching = null;
|
||||
this.host.isFetching = false;
|
||||
}
|
||||
}
|
||||
}
|
||||
request(id) {
|
||||
void this.update(id).catch((error) => {
|
||||
if (!this.current(id))
|
||||
return;
|
||||
this.stop();
|
||||
this.report(error);
|
||||
});
|
||||
}
|
||||
report(error) {
|
||||
try {
|
||||
this.failure(error);
|
||||
} catch (failure) {
|
||||
console.warn("MediaBunny video error listener:", failure);
|
||||
}
|
||||
}
|
||||
cancelFrame() {
|
||||
if (this.scheduled === null)
|
||||
return;
|
||||
cancelAnimationFrame(this.scheduled);
|
||||
this.scheduled = null;
|
||||
}
|
||||
schedule(id) {
|
||||
if (!this.current(id))
|
||||
return;
|
||||
this.cancelFrame();
|
||||
const frame = requestAnimationFrame(() => {
|
||||
if (this.scheduled !== frame || !this.current(id))
|
||||
return;
|
||||
this.scheduled = null;
|
||||
try {
|
||||
this.render();
|
||||
} catch (error) {
|
||||
this.stop();
|
||||
this.report(error);
|
||||
}
|
||||
});
|
||||
this.scheduled = frame;
|
||||
this.host.rafId = frame;
|
||||
}
|
||||
render() {
|
||||
const id = this.host.asyncId;
|
||||
const current = () => this.current(id);
|
||||
if (!current() || !this.host.audioClock)
|
||||
return;
|
||||
const time = this.host.audioClock.currentTime;
|
||||
const now = Date.now();
|
||||
if (now - this.host.lastTimeUpdate >= this.host.timeupdateInterval) {
|
||||
this.host.events.emit("timeupdate");
|
||||
if (!current())
|
||||
return;
|
||||
this.host.lastTimeUpdate = now;
|
||||
}
|
||||
if (!this.ready()) {
|
||||
this.schedule(id);
|
||||
return;
|
||||
}
|
||||
if (Number.isFinite(this.host.duration) && time >= this.host.duration) {
|
||||
this.stop();
|
||||
this.host.stalled = false;
|
||||
const ended = this.host.asyncId;
|
||||
publish(this.host.events, () => !this.closed && this.host.asyncId === ended, ["ended", "pause", "canplay"]);
|
||||
return;
|
||||
}
|
||||
if (this.host.nextFrame && this.host.nextFrame.timestamp <= time) {
|
||||
this.draw(this.host.nextFrame);
|
||||
this.host.nextFrame = null;
|
||||
this.request(id);
|
||||
if (this.host.stalled) {
|
||||
publish(this.host.events, current, ["canplay", "playing"]);
|
||||
if (!current())
|
||||
return;
|
||||
this.host.stalled = false;
|
||||
}
|
||||
} else if (!this.host.nextFrame) {
|
||||
this.request(id);
|
||||
if (Number.isFinite(this.host.duration) && time < this.host.duration && !this.host.stalled) {
|
||||
this.host.stalled = true;
|
||||
this.host.events.emit("waiting");
|
||||
}
|
||||
}
|
||||
this.schedule(id);
|
||||
}
|
||||
start(clock) {
|
||||
if (this.closed)
|
||||
return;
|
||||
this.stop();
|
||||
this.stopped = false;
|
||||
this.host.audioClock = clock;
|
||||
this.host.stalled = false;
|
||||
if (!this.host.nextFrame)
|
||||
this.request(this.host.asyncId);
|
||||
this.schedule(this.host.asyncId);
|
||||
}
|
||||
stop() {
|
||||
this.stopped = true;
|
||||
this.host.asyncId++;
|
||||
this.cancelFrame();
|
||||
this.fetching = null;
|
||||
this.host.isFetching = false;
|
||||
}
|
||||
destroy() {
|
||||
if (this.closed)
|
||||
return;
|
||||
this.stop();
|
||||
this.closed = true;
|
||||
}
|
||||
}
|
||||
class VideoEngine {
|
||||
constructor({
|
||||
canvas,
|
||||
ctx,
|
||||
events,
|
||||
timeupdateInterval = 250,
|
||||
avSyncTolerance = 0.12,
|
||||
dropLateFrames = false,
|
||||
poster = "",
|
||||
preflightRange: preflightRange2 = false
|
||||
}) {
|
||||
constructor({ canvas, ctx, events, timeupdateInterval = 250, avSyncTolerance = 0.12, dropLateFrames = false, poster = "", preflightRange: preflightRange2 = false, onError }) {
|
||||
__privateAdd(this, _VideoEngine_instances);
|
||||
__privateAdd(this, _generation, 0);
|
||||
__privateAdd(this, _iteration, 0);
|
||||
__privateAdd(this, _loading, null);
|
||||
__privateAdd(this, _createSink, null);
|
||||
__privateAdd(this, _usedSink, null);
|
||||
__privateAdd(this, _destroyed, false);
|
||||
__privateAdd(this, _preparing, false);
|
||||
__privateAdd(this, _poster, new Poster());
|
||||
__privateAdd(this, _renderer);
|
||||
__privateAdd(this, _onError);
|
||||
this.canvas = canvas;
|
||||
this.ctx = ctx;
|
||||
this.events = events;
|
||||
@@ -24775,33 +25007,171 @@ class VideoEngine {
|
||||
this.playbackRate = 1;
|
||||
this.posterDrawn = false;
|
||||
this.isFetching = false;
|
||||
__privateSet(this, _onError, onError);
|
||||
__privateSet(this, _renderer, new Renderer(this, () => !__privateGet(this, _preparing), (frame) => __privateMethod(this, _VideoEngine_instances, draw_fn).call(this, frame, true), (error) => __privateMethod(this, _VideoEngine_instances, report_fn).call(this, error)));
|
||||
}
|
||||
async preflight(url, signal, isCurrent) {
|
||||
return preflightRange(url, this.preflightRange, this.events, signal, isCurrent);
|
||||
async preflight(source, signal, current) {
|
||||
return preflightRange(source, this.preflightRange, this.events, signal, current);
|
||||
}
|
||||
drawPoster() {
|
||||
if (!this.poster || this.posterDrawn)
|
||||
if (__privateGet(this, _destroyed) || !this.poster || this.posterDrawn)
|
||||
return;
|
||||
const img = new Image();
|
||||
img.onload = () => {
|
||||
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
|
||||
this.canvas.width = img.naturalWidth || this.canvas.width;
|
||||
this.canvas.height = img.naturalHeight || this.canvas.height;
|
||||
this.ctx.drawImage(img, 0, 0, this.canvas.width, this.canvas.height);
|
||||
const generation = __privateGet(this, _generation);
|
||||
__privateGet(this, _poster).draw(this.poster, () => __privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation), (image) => {
|
||||
this.clear();
|
||||
this.canvas.width = image.naturalWidth || this.canvas.width;
|
||||
this.canvas.height = image.naturalHeight || this.canvas.height;
|
||||
__privateMethod(this, _VideoEngine_instances, context_fn).call(this).drawImage(image, 0, 0, this.canvas.width, this.canvas.height);
|
||||
this.posterDrawn = true;
|
||||
};
|
||||
img.src = this.poster;
|
||||
}, (error) => __privateMethod(this, _VideoEngine_instances, report_fn).call(this, error));
|
||||
}
|
||||
async stopIterator() {
|
||||
await this.videoIterator?.return();
|
||||
const iterator = this.videoIterator;
|
||||
this.videoIterator = null;
|
||||
this.nextFrame = null;
|
||||
await releaseIterator(iterator);
|
||||
}
|
||||
clear() {
|
||||
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
|
||||
__privateMethod(this, _VideoEngine_instances, context_fn).call(this).clearRect(0, 0, this.canvas.width, this.canvas.height);
|
||||
}
|
||||
cancelPending() {
|
||||
__privateWrapper(this, _generation)._++;
|
||||
__privateWrapper(this, _iteration)._++;
|
||||
this.stop();
|
||||
__privateMethod(this, _VideoEngine_instances, release_fn).call(this);
|
||||
__privateGet(this, _poster).cancel();
|
||||
__privateSet(this, _preparing, false);
|
||||
__privateSet(this, _loading, null);
|
||||
__privateSet(this, _createSink, null);
|
||||
__privateSet(this, _usedSink, null);
|
||||
this.videoSink = null;
|
||||
this.input = null;
|
||||
}
|
||||
async load(media, onMetadata) {
|
||||
++this.asyncId;
|
||||
await this.stopIterator();
|
||||
if (__privateGet(this, _destroyed))
|
||||
return;
|
||||
this.cancelPending();
|
||||
const generation = __privateGet(this, _generation);
|
||||
const iteration = __privateGet(this, _iteration);
|
||||
__privateSet(this, _preparing, true);
|
||||
const pending = Promise.resolve().then(() => __privateMethod(this, _VideoEngine_instances, load_fn).call(this, media, generation, iteration, onMetadata));
|
||||
__privateSet(this, _loading, pending);
|
||||
try {
|
||||
await pending;
|
||||
} finally {
|
||||
if (__privateGet(this, _loading) === pending)
|
||||
__privateSet(this, _loading, null);
|
||||
}
|
||||
}
|
||||
handleNoVideoTrack() {
|
||||
if (__privateGet(this, _destroyed))
|
||||
return;
|
||||
this.videoSink = null;
|
||||
this.width = 0;
|
||||
this.height = 0;
|
||||
this.canvas.width = 0;
|
||||
this.canvas.height = 0;
|
||||
this.clear();
|
||||
this.drawPoster();
|
||||
}
|
||||
async resetIterator(time) {
|
||||
if (__privateGet(this, _destroyed))
|
||||
return;
|
||||
const generation = __privateGet(this, _generation);
|
||||
const iteration = ++__privateWrapper(this, _iteration)._;
|
||||
const loading = __privateGet(this, _loading);
|
||||
this.stop();
|
||||
__privateGet(this, _poster).cancel();
|
||||
__privateSet(this, _preparing, true);
|
||||
try {
|
||||
if (loading)
|
||||
await loading;
|
||||
await __privateMethod(this, _VideoEngine_instances, reset_fn).call(this, time, generation, iteration);
|
||||
} catch (error) {
|
||||
if (__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation) && __privateGet(this, _iteration) === iteration) {
|
||||
__privateMethod(this, _VideoEngine_instances, release_fn).call(this);
|
||||
throw error;
|
||||
}
|
||||
} finally {
|
||||
if (__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation) && __privateGet(this, _iteration) === iteration)
|
||||
__privateSet(this, _preparing, false);
|
||||
}
|
||||
}
|
||||
async updateNextFrame(localId) {
|
||||
await __privateGet(this, _renderer).update(localId);
|
||||
}
|
||||
render() {
|
||||
__privateGet(this, _renderer).render();
|
||||
}
|
||||
start(audio) {
|
||||
__privateGet(this, _renderer).start(audio);
|
||||
}
|
||||
stop() {
|
||||
__privateGet(this, _renderer).stop();
|
||||
}
|
||||
async seek(time) {
|
||||
await this.resetIterator(time);
|
||||
}
|
||||
setPlaybackRate(rate) {
|
||||
this.playbackRate = Math.max(0.1, Number(rate) || 1);
|
||||
}
|
||||
destroy() {
|
||||
if (__privateGet(this, _destroyed))
|
||||
return;
|
||||
__privateSet(this, _destroyed, true);
|
||||
__privateWrapper(this, _generation)._++;
|
||||
__privateGet(this, _renderer).destroy();
|
||||
__privateGet(this, _poster).cancel();
|
||||
__privateMethod(this, _VideoEngine_instances, release_fn).call(this);
|
||||
this.posterDrawn = false;
|
||||
__privateSet(this, _createSink, null);
|
||||
__privateSet(this, _usedSink, null);
|
||||
this.videoSink = null;
|
||||
this.input = null;
|
||||
this.audioClock = null;
|
||||
}
|
||||
}
|
||||
_generation = new WeakMap();
|
||||
_iteration = new WeakMap();
|
||||
_loading = new WeakMap();
|
||||
_createSink = new WeakMap();
|
||||
_usedSink = new WeakMap();
|
||||
_destroyed = new WeakMap();
|
||||
_preparing = new WeakMap();
|
||||
_poster = new WeakMap();
|
||||
_renderer = new WeakMap();
|
||||
_onError = new WeakMap();
|
||||
_VideoEngine_instances = new WeakSet();
|
||||
current_fn = function(generation) {
|
||||
return !__privateGet(this, _destroyed) && __privateGet(this, _generation) === generation;
|
||||
};
|
||||
context_fn = function() {
|
||||
if (!this.ctx)
|
||||
throw new Error("Canvas 2D context is unavailable.");
|
||||
return this.ctx;
|
||||
};
|
||||
report_fn = function(error) {
|
||||
if (__privateGet(this, _destroyed))
|
||||
return;
|
||||
__privateMethod(this, _VideoEngine_instances, release_fn).call(this);
|
||||
if (__privateGet(this, _onError))
|
||||
__privateGet(this, _onError).call(this, error);
|
||||
else
|
||||
this.events.emit("error", error);
|
||||
};
|
||||
release_fn = function() {
|
||||
void this.stopIterator().catch((error) => console.warn("MediaBunny iterator cleanup error:", error));
|
||||
};
|
||||
draw_fn = function(frame, clear) {
|
||||
__privateGet(this, _poster).cancel();
|
||||
if (clear)
|
||||
this.clear();
|
||||
__privateMethod(this, _VideoEngine_instances, context_fn).call(this).drawImage(frame.canvas, 0, 0);
|
||||
};
|
||||
load_fn = async function(media, generation, iteration, onMetadata) {
|
||||
if (!__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation))
|
||||
return;
|
||||
try {
|
||||
this.clear();
|
||||
this.posterDrawn = false;
|
||||
const { input, videoTrack, duration } = media;
|
||||
@@ -24812,139 +25182,61 @@ class VideoEngine {
|
||||
onMetadata?.();
|
||||
return;
|
||||
}
|
||||
if (videoTrack.codec === null || !await videoTrack.canDecode()) {
|
||||
const decodable = videoTrack.codec !== null && await videoTrack.canDecode();
|
||||
if (!__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation))
|
||||
return;
|
||||
if (!decodable) {
|
||||
this.handleNoVideoTrack();
|
||||
onMetadata?.();
|
||||
return;
|
||||
}
|
||||
const transparent = await videoTrack.canBeTransparent();
|
||||
this.videoSink = new CanvasSink(videoTrack, {
|
||||
poolSize: 2,
|
||||
fit: "contain",
|
||||
alpha: transparent
|
||||
});
|
||||
if (!__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation))
|
||||
return;
|
||||
__privateSet(this, _createSink, () => new CanvasSink(videoTrack, { poolSize: 2, fit: "contain", alpha: transparent }));
|
||||
this.videoSink = __privateGet(this, _createSink).call(this);
|
||||
this.width = videoTrack.displayWidth;
|
||||
this.height = videoTrack.displayHeight;
|
||||
this.canvas.width = this.width;
|
||||
this.canvas.height = this.height;
|
||||
onMetadata?.();
|
||||
await this.resetIterator(0);
|
||||
if (__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation))
|
||||
await __privateMethod(this, _VideoEngine_instances, reset_fn).call(this, 0, generation, iteration);
|
||||
} catch (error) {
|
||||
if (__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation)) {
|
||||
__privateMethod(this, _VideoEngine_instances, release_fn).call(this);
|
||||
throw error;
|
||||
}
|
||||
} finally {
|
||||
if (__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation) && __privateGet(this, _iteration) === iteration)
|
||||
__privateSet(this, _preparing, false);
|
||||
}
|
||||
handleNoVideoTrack() {
|
||||
this.videoSink = null;
|
||||
this.width = 0;
|
||||
this.height = 0;
|
||||
this.canvas.width = 0;
|
||||
this.canvas.height = 0;
|
||||
this.clear();
|
||||
};
|
||||
reset_fn = async function(time, generation, iteration) {
|
||||
if (!__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation) || __privateGet(this, _iteration) !== iteration)
|
||||
return;
|
||||
__privateMethod(this, _VideoEngine_instances, release_fn).call(this);
|
||||
if (__privateGet(this, _createSink) && this.videoSink === __privateGet(this, _usedSink))
|
||||
this.videoSink = __privateGet(this, _createSink).call(this);
|
||||
const sink = this.videoSink;
|
||||
if (!sink || !__privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation))
|
||||
return;
|
||||
__privateSet(this, _usedSink, sink);
|
||||
const iterator = sink.canvases(time);
|
||||
this.videoIterator = iterator;
|
||||
const current = () => __privateMethod(this, _VideoEngine_instances, current_fn).call(this, generation) && __privateGet(this, _iteration) === iteration && this.videoIterator === iterator;
|
||||
const first = await readCanvas(iterator);
|
||||
if (!current())
|
||||
return;
|
||||
const second = await readCanvas(iterator);
|
||||
if (!current())
|
||||
return;
|
||||
this.nextFrame = second;
|
||||
if (first)
|
||||
__privateMethod(this, _VideoEngine_instances, draw_fn).call(this, first, false);
|
||||
else
|
||||
this.drawPoster();
|
||||
}
|
||||
async resetIterator(time) {
|
||||
await this.stopIterator();
|
||||
if (!this.videoSink)
|
||||
return;
|
||||
this.videoIterator = this.videoSink.canvases(time);
|
||||
const first = (await this.videoIterator.next()).value ?? null;
|
||||
const second = (await this.videoIterator.next()).value ?? null;
|
||||
this.nextFrame = second;
|
||||
if (first) {
|
||||
this.ctx.drawImage(first.canvas, 0, 0);
|
||||
} else {
|
||||
this.drawPoster();
|
||||
}
|
||||
}
|
||||
async updateNextFrame(localId) {
|
||||
if (!this.videoIterator || this.isFetching)
|
||||
return;
|
||||
this.isFetching = true;
|
||||
try {
|
||||
while (true) {
|
||||
const frame = (await this.videoIterator.next()).value ?? null;
|
||||
if (!frame || localId !== this.asyncId)
|
||||
return;
|
||||
const t = this.audioClock.currentTime;
|
||||
const tolerance = this.dropLateFrames ? Math.max(0.06, this.avSyncTolerance / Math.max(1, this.playbackRate)) : 0;
|
||||
if (this.dropLateFrames && frame.timestamp < t - tolerance) {
|
||||
continue;
|
||||
}
|
||||
if (frame.timestamp <= t + tolerance) {
|
||||
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
|
||||
this.ctx.drawImage(frame.canvas, 0, 0);
|
||||
if (!this.dropLateFrames && frame.timestamp > t) {
|
||||
this.nextFrame = null;
|
||||
return;
|
||||
}
|
||||
} else {
|
||||
this.nextFrame = frame;
|
||||
return;
|
||||
}
|
||||
}
|
||||
} finally {
|
||||
this.isFetching = false;
|
||||
}
|
||||
}
|
||||
render() {
|
||||
if (!this.audioClock)
|
||||
return;
|
||||
const t = this.audioClock.currentTime;
|
||||
const now = Date.now();
|
||||
if (now - this.lastTimeUpdate >= this.timeupdateInterval) {
|
||||
this.events.emit("timeupdate");
|
||||
this.lastTimeUpdate = now;
|
||||
}
|
||||
if (Number.isFinite(this.duration) && t >= this.duration) {
|
||||
this.stop();
|
||||
this.stalled = false;
|
||||
this.events.emit("ended");
|
||||
this.events.emit("pause");
|
||||
this.events.emit("canplay");
|
||||
return;
|
||||
}
|
||||
if (this.nextFrame && this.nextFrame.timestamp <= t) {
|
||||
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
|
||||
this.ctx.drawImage(this.nextFrame.canvas, 0, 0);
|
||||
this.nextFrame = null;
|
||||
this.updateNextFrame(this.asyncId);
|
||||
if (this.stalled) {
|
||||
this.events.emit("canplay");
|
||||
this.events.emit("playing");
|
||||
this.stalled = false;
|
||||
}
|
||||
} else if (!this.nextFrame) {
|
||||
this.updateNextFrame(this.asyncId);
|
||||
if (!this.nextFrame && Number.isFinite(this.duration) && t < this.duration && !this.stalled) {
|
||||
this.stalled = true;
|
||||
this.events.emit("waiting");
|
||||
}
|
||||
}
|
||||
this.rafId = requestAnimationFrame(() => this.render());
|
||||
}
|
||||
start(audioEngine) {
|
||||
this.audioClock = audioEngine;
|
||||
this.asyncId++;
|
||||
this.stalled = false;
|
||||
this.updateNextFrame(this.asyncId);
|
||||
this.rafId = requestAnimationFrame(() => this.render());
|
||||
}
|
||||
stop() {
|
||||
cancelAnimationFrame(this.rafId);
|
||||
}
|
||||
async seek(time) {
|
||||
this.asyncId++;
|
||||
await this.resetIterator(time);
|
||||
}
|
||||
setPlaybackRate(rate) {
|
||||
this.playbackRate = Math.max(0.1, Number(rate) || 1);
|
||||
}
|
||||
destroy() {
|
||||
this.asyncId++;
|
||||
this.stop();
|
||||
this.stopIterator();
|
||||
this.posterDrawn = false;
|
||||
this.videoSink = null;
|
||||
this.input = null;
|
||||
}
|
||||
}
|
||||
};
|
||||
class MediaBunnyEngine {
|
||||
constructor({ canvas, ctx, events, option = {} }) {
|
||||
__privateAdd(this, _playback);
|
||||
@@ -24959,7 +25251,15 @@ class MediaBunnyEngine {
|
||||
avSyncTolerance: option.avSyncTolerance ?? 0.12,
|
||||
dropLateFrames: option.dropLateFrames ?? false,
|
||||
poster: option.poster ?? "",
|
||||
preflightRange: option.preflightRange ?? false
|
||||
preflightRange: option.preflightRange ?? false,
|
||||
onError: (error) => {
|
||||
try {
|
||||
this.pause();
|
||||
} catch (failure) {
|
||||
console.warn("MediaBunny video failure cleanup:", failure);
|
||||
}
|
||||
this.reportError(error);
|
||||
}
|
||||
});
|
||||
this.paused = true;
|
||||
this.ended = false;
|
||||
@@ -24986,6 +25286,7 @@ class MediaBunnyEngine {
|
||||
return;
|
||||
const id = ++this.loadSeq;
|
||||
__privateGet(this, _playback).invalidate();
|
||||
this.video.cancelPending();
|
||||
this.loadSession?.cancel();
|
||||
if (id !== this.loadSeq || this.destroyed)
|
||||
return;
|
||||
@@ -25009,6 +25310,7 @@ class MediaBunnyEngine {
|
||||
return;
|
||||
const failed = ++this.loadSeq;
|
||||
__privateGet(this, _playback).invalidate();
|
||||
this.video.cancelPending();
|
||||
session.cancel();
|
||||
if (failed !== this.loadSeq || this.destroyed)
|
||||
return;
|
||||
|
||||
@@ -45,6 +45,15 @@ export default class MediaBunnyEngine implements EnginePort {
|
||||
dropLateFrames: option.dropLateFrames ?? false,
|
||||
poster: option.poster ?? '',
|
||||
preflightRange: option.preflightRange ?? false,
|
||||
onError: (error) => {
|
||||
try {
|
||||
this.pause()
|
||||
}
|
||||
catch (failure) {
|
||||
console.warn('MediaBunny video failure cleanup:', failure)
|
||||
}
|
||||
this.reportError(error)
|
||||
},
|
||||
})
|
||||
this.paused = true
|
||||
this.ended = false
|
||||
@@ -72,6 +81,7 @@ export default class MediaBunnyEngine implements EnginePort {
|
||||
return
|
||||
const id = ++this.loadSeq
|
||||
this.#playback.invalidate()
|
||||
this.video.cancelPending()
|
||||
this.loadSession?.cancel()
|
||||
if (id !== this.loadSeq || this.destroyed)
|
||||
return
|
||||
@@ -96,6 +106,7 @@ export default class MediaBunnyEngine implements EnginePort {
|
||||
return
|
||||
const failed = ++this.loadSeq
|
||||
this.#playback.invalidate()
|
||||
this.video.cancelPending()
|
||||
session.cancel()
|
||||
if (failed !== this.loadSeq || this.destroyed)
|
||||
return
|
||||
|
||||
@@ -1,5 +0,0 @@
|
||||
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
|
||||
@@ -1,272 +0,0 @@
|
||||
/**
|
||||
* Video Engine for MediaBunny
|
||||
* Handles video frame rendering and synchronization
|
||||
*/
|
||||
import {
|
||||
CanvasSink,
|
||||
} from 'mediabunny'
|
||||
import { preflightRange } from './preflight'
|
||||
|
||||
export default class VideoEngine {
|
||||
constructor({
|
||||
canvas,
|
||||
ctx,
|
||||
events,
|
||||
timeupdateInterval = 250,
|
||||
avSyncTolerance = 0.12,
|
||||
dropLateFrames = false,
|
||||
poster = '',
|
||||
preflightRange = false,
|
||||
}) {
|
||||
this.canvas = canvas
|
||||
this.ctx = ctx
|
||||
this.events = events
|
||||
this.timeupdateInterval = timeupdateInterval
|
||||
this.avSyncTolerance = avSyncTolerance
|
||||
this.dropLateFrames = dropLateFrames
|
||||
this.poster = poster
|
||||
this.preflightRange = preflightRange
|
||||
|
||||
// MediaBunny instances
|
||||
this.input = null
|
||||
this.videoSink = null
|
||||
this.videoIterator = null
|
||||
|
||||
// Frame rendering
|
||||
this.nextFrame = null
|
||||
this.rafId = 0
|
||||
this.asyncId = 0
|
||||
|
||||
// Video properties
|
||||
this.width = 0
|
||||
this.height = 0
|
||||
this.duration = Number.NaN
|
||||
|
||||
// Playback state
|
||||
this.audioClock = null
|
||||
this.lastTimeUpdate = 0
|
||||
this.stalled = false
|
||||
this.playbackRate = 1
|
||||
this.posterDrawn = false
|
||||
this.isFetching = false
|
||||
}
|
||||
|
||||
async preflight(url, signal, isCurrent) {
|
||||
return preflightRange(url, this.preflightRange, this.events, signal, isCurrent)
|
||||
}
|
||||
|
||||
drawPoster() {
|
||||
if (!this.poster || this.posterDrawn)
|
||||
return
|
||||
|
||||
const img = new Image()
|
||||
img.onload = () => {
|
||||
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height)
|
||||
this.canvas.width = img.naturalWidth || this.canvas.width
|
||||
this.canvas.height = img.naturalHeight || this.canvas.height
|
||||
this.ctx.drawImage(img, 0, 0, this.canvas.width, this.canvas.height)
|
||||
this.posterDrawn = true
|
||||
}
|
||||
img.src = this.poster
|
||||
}
|
||||
|
||||
async stopIterator() {
|
||||
await this.videoIterator?.return()
|
||||
this.videoIterator = null
|
||||
}
|
||||
|
||||
clear() {
|
||||
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height)
|
||||
}
|
||||
|
||||
async load(media, onMetadata) {
|
||||
++this.asyncId
|
||||
|
||||
await this.stopIterator()
|
||||
this.clear()
|
||||
this.posterDrawn = false
|
||||
|
||||
const { input, videoTrack, duration } = media
|
||||
this.input = input
|
||||
this.duration = duration
|
||||
|
||||
if (!videoTrack) {
|
||||
this.handleNoVideoTrack()
|
||||
onMetadata?.()
|
||||
return
|
||||
}
|
||||
|
||||
if (videoTrack.codec === null || !(await videoTrack.canDecode())) {
|
||||
this.handleNoVideoTrack()
|
||||
onMetadata?.()
|
||||
return
|
||||
}
|
||||
|
||||
const transparent = await videoTrack.canBeTransparent()
|
||||
this.videoSink = new CanvasSink(videoTrack, {
|
||||
poolSize: 2,
|
||||
fit: 'contain',
|
||||
alpha: transparent,
|
||||
})
|
||||
|
||||
this.width = videoTrack.displayWidth
|
||||
this.height = videoTrack.displayHeight
|
||||
|
||||
this.canvas.width = this.width
|
||||
this.canvas.height = this.height
|
||||
|
||||
onMetadata?.()
|
||||
|
||||
await this.resetIterator(0)
|
||||
}
|
||||
|
||||
handleNoVideoTrack() {
|
||||
this.videoSink = null
|
||||
this.width = 0
|
||||
this.height = 0
|
||||
this.canvas.width = 0
|
||||
this.canvas.height = 0
|
||||
this.clear()
|
||||
this.drawPoster()
|
||||
}
|
||||
|
||||
async resetIterator(time) {
|
||||
await this.stopIterator()
|
||||
|
||||
if (!this.videoSink)
|
||||
return
|
||||
|
||||
this.videoIterator = this.videoSink.canvases(time)
|
||||
|
||||
const first = (await this.videoIterator.next()).value ?? null
|
||||
const second = (await this.videoIterator.next()).value ?? null
|
||||
|
||||
this.nextFrame = second
|
||||
|
||||
if (first) {
|
||||
this.ctx.drawImage(first.canvas, 0, 0)
|
||||
}
|
||||
else {
|
||||
this.drawPoster()
|
||||
}
|
||||
}
|
||||
|
||||
async updateNextFrame(localId) {
|
||||
if (!this.videoIterator || this.isFetching)
|
||||
return
|
||||
|
||||
this.isFetching = true
|
||||
try {
|
||||
while (true) {
|
||||
const frame = (await this.videoIterator.next()).value ?? null
|
||||
if (!frame || localId !== this.asyncId)
|
||||
return
|
||||
|
||||
const t = this.audioClock.currentTime
|
||||
const tolerance = this.dropLateFrames
|
||||
? Math.max(0.06, this.avSyncTolerance / Math.max(1, this.playbackRate))
|
||||
: 0
|
||||
|
||||
if (this.dropLateFrames && frame.timestamp < t - tolerance) {
|
||||
// Skip late frame
|
||||
continue
|
||||
}
|
||||
|
||||
if (frame.timestamp <= t + tolerance) {
|
||||
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height)
|
||||
this.ctx.drawImage(frame.canvas, 0, 0)
|
||||
|
||||
if (!this.dropLateFrames && frame.timestamp > t) {
|
||||
this.nextFrame = null
|
||||
return
|
||||
}
|
||||
}
|
||||
else {
|
||||
this.nextFrame = frame
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
finally {
|
||||
this.isFetching = false
|
||||
}
|
||||
}
|
||||
|
||||
render() {
|
||||
if (!this.audioClock)
|
||||
return
|
||||
|
||||
const t = this.audioClock.currentTime
|
||||
const now = Date.now()
|
||||
|
||||
// Emit timeupdate event
|
||||
if (now - this.lastTimeUpdate >= this.timeupdateInterval) {
|
||||
this.events.emit('timeupdate')
|
||||
this.lastTimeUpdate = now
|
||||
}
|
||||
|
||||
// Check if reached end
|
||||
if (Number.isFinite(this.duration) && t >= this.duration) {
|
||||
this.stop()
|
||||
this.stalled = false
|
||||
this.events.emit('ended')
|
||||
this.events.emit('pause')
|
||||
this.events.emit('canplay')
|
||||
return
|
||||
}
|
||||
|
||||
// Render next frame if ready
|
||||
if (this.nextFrame && this.nextFrame.timestamp <= t) {
|
||||
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height)
|
||||
this.ctx.drawImage(this.nextFrame.canvas, 0, 0)
|
||||
this.nextFrame = null
|
||||
this.updateNextFrame(this.asyncId)
|
||||
|
||||
if (this.stalled) {
|
||||
this.events.emit('canplay')
|
||||
this.events.emit('playing')
|
||||
this.stalled = false
|
||||
}
|
||||
}
|
||||
else if (!this.nextFrame) {
|
||||
this.updateNextFrame(this.asyncId)
|
||||
|
||||
if (!this.nextFrame && Number.isFinite(this.duration) && t < this.duration && !this.stalled) {
|
||||
this.stalled = true
|
||||
this.events.emit('waiting')
|
||||
}
|
||||
}
|
||||
|
||||
this.rafId = requestAnimationFrame(() => this.render())
|
||||
}
|
||||
|
||||
start(audioEngine) {
|
||||
this.audioClock = audioEngine
|
||||
this.asyncId++
|
||||
this.stalled = false
|
||||
this.updateNextFrame(this.asyncId)
|
||||
this.rafId = requestAnimationFrame(() => this.render())
|
||||
}
|
||||
|
||||
stop() {
|
||||
cancelAnimationFrame(this.rafId)
|
||||
}
|
||||
|
||||
async seek(time) {
|
||||
this.asyncId++
|
||||
await this.resetIterator(time)
|
||||
}
|
||||
|
||||
setPlaybackRate(rate) {
|
||||
this.playbackRate = Math.max(0.1, Number(rate) || 1)
|
||||
}
|
||||
|
||||
destroy() {
|
||||
this.asyncId++
|
||||
this.stop()
|
||||
this.stopIterator()
|
||||
this.posterDrawn = false
|
||||
this.videoSink = null
|
||||
this.input = null
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,316 @@
|
||||
import type { Input, WrappedCanvas } from 'mediabunny'
|
||||
import type { VideoOptions, VideoPort } from './engine-ports'
|
||||
import type EventTarget from './EventTarget'
|
||||
import type { PlaybackMedia } from './media'
|
||||
import type { FrameIterator } from './video-frames'
|
||||
import { CanvasSink } from 'mediabunny'
|
||||
import { preflightRange } from './preflight'
|
||||
import { readCanvas, releaseIterator } from './video-frames'
|
||||
import Poster from './video-poster'
|
||||
import Renderer from './video-renderer'
|
||||
|
||||
export default class VideoEngine implements VideoPort {
|
||||
declare canvas: HTMLCanvasElement
|
||||
declare ctx: CanvasRenderingContext2D | null
|
||||
declare events: EventTarget
|
||||
declare timeupdateInterval: number
|
||||
declare avSyncTolerance: number
|
||||
declare dropLateFrames: boolean
|
||||
declare poster: string
|
||||
declare preflightRange: boolean
|
||||
declare input: Input | null
|
||||
declare videoSink: CanvasSink | null
|
||||
declare videoIterator: FrameIterator | null
|
||||
declare nextFrame: WrappedCanvas | null
|
||||
declare rafId: number
|
||||
declare asyncId: number
|
||||
declare width: number
|
||||
declare height: number
|
||||
declare duration: number
|
||||
declare audioClock: { readonly currentTime: number } | null
|
||||
declare lastTimeUpdate: number
|
||||
declare stalled: boolean
|
||||
declare playbackRate: number
|
||||
declare posterDrawn: boolean
|
||||
declare isFetching: boolean
|
||||
#generation = 0
|
||||
#iteration = 0
|
||||
#loading: Promise<void> | null = null
|
||||
#createSink: (() => CanvasSink) | null = null
|
||||
#usedSink: CanvasSink | null = null
|
||||
#destroyed = false
|
||||
#preparing = false
|
||||
#poster = new Poster()
|
||||
#renderer: Renderer
|
||||
#onError: ((error: unknown) => void) | undefined
|
||||
|
||||
constructor({ canvas, ctx, events, timeupdateInterval = 250, avSyncTolerance = 0.12, dropLateFrames = false, poster = '', preflightRange = false, onError }: VideoOptions) {
|
||||
this.canvas = canvas
|
||||
this.ctx = ctx
|
||||
this.events = events
|
||||
this.timeupdateInterval = timeupdateInterval
|
||||
this.avSyncTolerance = avSyncTolerance
|
||||
this.dropLateFrames = dropLateFrames
|
||||
this.poster = poster
|
||||
this.preflightRange = preflightRange
|
||||
this.input = null
|
||||
this.videoSink = null
|
||||
this.videoIterator = null
|
||||
this.nextFrame = null
|
||||
this.rafId = 0
|
||||
this.asyncId = 0
|
||||
this.width = 0
|
||||
this.height = 0
|
||||
this.duration = Number.NaN
|
||||
this.audioClock = null
|
||||
this.lastTimeUpdate = 0
|
||||
this.stalled = false
|
||||
this.playbackRate = 1
|
||||
this.posterDrawn = false
|
||||
this.isFetching = false
|
||||
this.#onError = onError
|
||||
this.#renderer = new Renderer(this, () => !this.#preparing, frame => this.#draw(frame, true), error => this.#report(error))
|
||||
}
|
||||
|
||||
#current(generation: number): boolean {
|
||||
return !this.#destroyed && this.#generation === generation
|
||||
}
|
||||
|
||||
#context(): CanvasRenderingContext2D {
|
||||
if (!this.ctx)
|
||||
throw new Error('Canvas 2D context is unavailable.')
|
||||
return this.ctx
|
||||
}
|
||||
|
||||
#report(error: unknown): void {
|
||||
if (this.#destroyed)
|
||||
return
|
||||
this.#release()
|
||||
if (this.#onError)
|
||||
this.#onError(error)
|
||||
else
|
||||
this.events.emit('error', error)
|
||||
}
|
||||
|
||||
#release(): void {
|
||||
void this.stopIterator().catch(error => console.warn('MediaBunny iterator cleanup error:', error))
|
||||
}
|
||||
|
||||
#draw(frame: WrappedCanvas, clear: boolean): void {
|
||||
this.#poster.cancel()
|
||||
if (clear)
|
||||
this.clear()
|
||||
this.#context().drawImage(frame.canvas, 0, 0)
|
||||
}
|
||||
|
||||
async preflight(source: unknown, signal?: AbortSignal, current?: () => boolean): Promise<boolean> {
|
||||
return preflightRange(source, this.preflightRange, this.events, signal, current)
|
||||
}
|
||||
|
||||
drawPoster(): void {
|
||||
if (this.#destroyed || !this.poster || this.posterDrawn)
|
||||
return
|
||||
const generation = this.#generation
|
||||
this.#poster.draw(this.poster, () => this.#current(generation), (image) => {
|
||||
this.clear()
|
||||
this.canvas.width = image.naturalWidth || this.canvas.width
|
||||
this.canvas.height = image.naturalHeight || this.canvas.height
|
||||
this.#context().drawImage(image, 0, 0, this.canvas.width, this.canvas.height)
|
||||
this.posterDrawn = true
|
||||
}, error => this.#report(error))
|
||||
}
|
||||
|
||||
async stopIterator(): Promise<void> {
|
||||
const iterator = this.videoIterator
|
||||
this.videoIterator = null
|
||||
this.nextFrame = null
|
||||
await releaseIterator(iterator)
|
||||
}
|
||||
|
||||
clear(): void {
|
||||
this.#context().clearRect(0, 0, this.canvas.width, this.canvas.height)
|
||||
}
|
||||
|
||||
cancelPending(): void {
|
||||
this.#generation++
|
||||
this.#iteration++
|
||||
this.stop()
|
||||
this.#release()
|
||||
this.#poster.cancel()
|
||||
this.#preparing = false
|
||||
this.#loading = null
|
||||
this.#createSink = null
|
||||
this.#usedSink = null
|
||||
this.videoSink = null
|
||||
this.input = null
|
||||
}
|
||||
|
||||
async load(media: PlaybackMedia, onMetadata?: () => void): Promise<void> {
|
||||
if (this.#destroyed)
|
||||
return
|
||||
this.cancelPending()
|
||||
const generation = this.#generation
|
||||
const iteration = this.#iteration
|
||||
this.#preparing = true
|
||||
const pending = Promise.resolve().then(() => this.#load(media, generation, iteration, onMetadata))
|
||||
this.#loading = pending
|
||||
try {
|
||||
await pending
|
||||
}
|
||||
finally {
|
||||
if (this.#loading === pending)
|
||||
this.#loading = null
|
||||
}
|
||||
}
|
||||
|
||||
async #load(media: PlaybackMedia, generation: number, iteration: number, onMetadata?: () => void): Promise<void> {
|
||||
if (!this.#current(generation))
|
||||
return
|
||||
try {
|
||||
this.clear()
|
||||
this.posterDrawn = false
|
||||
const { input, videoTrack, duration } = media
|
||||
this.input = input
|
||||
this.duration = duration
|
||||
if (!videoTrack) {
|
||||
this.handleNoVideoTrack()
|
||||
onMetadata?.()
|
||||
return
|
||||
}
|
||||
const decodable = videoTrack.codec !== null && await videoTrack.canDecode()
|
||||
if (!this.#current(generation))
|
||||
return
|
||||
if (!decodable) {
|
||||
this.handleNoVideoTrack()
|
||||
onMetadata?.()
|
||||
return
|
||||
}
|
||||
const transparent = await videoTrack.canBeTransparent()
|
||||
if (!this.#current(generation))
|
||||
return
|
||||
this.#createSink = () => new CanvasSink(videoTrack, { poolSize: 2, fit: 'contain', alpha: transparent })
|
||||
this.videoSink = this.#createSink()
|
||||
this.width = videoTrack.displayWidth
|
||||
this.height = videoTrack.displayHeight
|
||||
this.canvas.width = this.width
|
||||
this.canvas.height = this.height
|
||||
onMetadata?.()
|
||||
if (this.#current(generation))
|
||||
await this.#reset(0, generation, iteration)
|
||||
}
|
||||
catch (error) {
|
||||
if (this.#current(generation)) {
|
||||
this.#release()
|
||||
throw error
|
||||
}
|
||||
}
|
||||
finally {
|
||||
if (this.#current(generation) && this.#iteration === iteration)
|
||||
this.#preparing = false
|
||||
}
|
||||
}
|
||||
|
||||
handleNoVideoTrack(): void {
|
||||
if (this.#destroyed)
|
||||
return
|
||||
this.videoSink = null
|
||||
this.width = 0
|
||||
this.height = 0
|
||||
this.canvas.width = 0
|
||||
this.canvas.height = 0
|
||||
this.clear()
|
||||
this.drawPoster()
|
||||
}
|
||||
|
||||
async #reset(time: number, generation: number, iteration: number): Promise<void> {
|
||||
if (!this.#current(generation) || this.#iteration !== iteration)
|
||||
return
|
||||
this.#release()
|
||||
if (this.#createSink && this.videoSink === this.#usedSink)
|
||||
this.videoSink = this.#createSink()
|
||||
const sink = this.videoSink
|
||||
if (!sink || !this.#current(generation))
|
||||
return
|
||||
this.#usedSink = sink
|
||||
const iterator = sink.canvases(time)
|
||||
this.videoIterator = iterator
|
||||
const current = () => this.#current(generation) && this.#iteration === iteration && this.videoIterator === iterator
|
||||
const first = await readCanvas(iterator)
|
||||
if (!current())
|
||||
return
|
||||
const second = await readCanvas(iterator)
|
||||
if (!current())
|
||||
return
|
||||
this.nextFrame = second
|
||||
if (first)
|
||||
this.#draw(first, false)
|
||||
else
|
||||
this.drawPoster()
|
||||
}
|
||||
|
||||
async resetIterator(time: number): Promise<void> {
|
||||
if (this.#destroyed)
|
||||
return
|
||||
const generation = this.#generation
|
||||
const iteration = ++this.#iteration
|
||||
const loading = this.#loading
|
||||
this.stop()
|
||||
this.#poster.cancel()
|
||||
this.#preparing = true
|
||||
try {
|
||||
if (loading)
|
||||
await loading
|
||||
await this.#reset(time, generation, iteration)
|
||||
}
|
||||
catch (error) {
|
||||
if (this.#current(generation) && this.#iteration === iteration) {
|
||||
this.#release()
|
||||
throw error
|
||||
}
|
||||
}
|
||||
finally {
|
||||
if (this.#current(generation) && this.#iteration === iteration)
|
||||
this.#preparing = false
|
||||
}
|
||||
}
|
||||
|
||||
async updateNextFrame(localId: number): Promise<void> {
|
||||
await this.#renderer.update(localId)
|
||||
}
|
||||
|
||||
render(): void {
|
||||
this.#renderer.render()
|
||||
}
|
||||
|
||||
start(audio: { readonly currentTime: number }): void {
|
||||
this.#renderer.start(audio)
|
||||
}
|
||||
|
||||
stop(): void {
|
||||
this.#renderer.stop()
|
||||
}
|
||||
|
||||
async seek(time: number): Promise<void> {
|
||||
await this.resetIterator(time)
|
||||
}
|
||||
|
||||
setPlaybackRate(rate: number): void {
|
||||
this.playbackRate = Math.max(0.1, Number(rate) || 1)
|
||||
}
|
||||
|
||||
destroy(): void {
|
||||
if (this.#destroyed)
|
||||
return
|
||||
this.#destroyed = true
|
||||
this.#generation++
|
||||
this.#renderer.destroy()
|
||||
this.#poster.cancel()
|
||||
this.#release()
|
||||
this.posterDrawn = false
|
||||
this.#createSink = null
|
||||
this.#usedSink = null
|
||||
this.videoSink = null
|
||||
this.input = null
|
||||
this.audioClock = null
|
||||
}
|
||||
}
|
||||
@@ -18,6 +18,7 @@ export interface AudioPort {
|
||||
}
|
||||
|
||||
export interface VideoPort {
|
||||
cancelPending: () => void
|
||||
width: number
|
||||
height: number
|
||||
duration: number
|
||||
@@ -32,6 +33,7 @@ export interface VideoPort {
|
||||
}
|
||||
|
||||
export interface VideoOptions {
|
||||
onError?: (error: unknown) => void
|
||||
canvas: HTMLCanvasElement
|
||||
ctx: CanvasRenderingContext2D | null
|
||||
events: EventTarget
|
||||
|
||||
@@ -0,0 +1,37 @@
|
||||
import type { WrappedCanvas } from 'mediabunny'
|
||||
|
||||
export type FrameIterator = Pick<AsyncGenerator<WrappedCanvas, void, unknown>, 'next' | 'return'>
|
||||
const closing = new WeakMap<FrameIterator, Promise<void>>()
|
||||
const reading = new WeakMap<FrameIterator, Promise<WrappedCanvas | null>>()
|
||||
|
||||
export function releaseIterator(iterator: FrameIterator | null): Promise<void> {
|
||||
if (!iterator)
|
||||
return Promise.resolve()
|
||||
const previous = closing.get(iterator)
|
||||
if (previous)
|
||||
return previous
|
||||
const pending = Promise.resolve().then(() => iterator.return()).then(() => {})
|
||||
closing.set(iterator, pending)
|
||||
return pending
|
||||
}
|
||||
|
||||
export function readCanvas(iterator: FrameIterator): Promise<WrappedCanvas | null> {
|
||||
const previous = reading.get(iterator)
|
||||
if (previous)
|
||||
return previous
|
||||
const pending = Promise.resolve().then(() => iterator.next()).then(result => result.value ?? null)
|
||||
reading.set(iterator, pending)
|
||||
const clear = () => {
|
||||
if (reading.get(iterator) === pending)
|
||||
reading.delete(iterator)
|
||||
}
|
||||
pending.then(clear, clear)
|
||||
return pending
|
||||
}
|
||||
|
||||
export function frameAction(timestamp: number, time: number, dropLateFrames: boolean, avSyncTolerance: number, playbackRate: number): 'skip' | 'draw' | 'queue' {
|
||||
const tolerance = dropLateFrames ? Math.max(0.06, avSyncTolerance / Math.max(1, playbackRate)) : 0
|
||||
if (dropLateFrames && timestamp < time - tolerance)
|
||||
return 'skip'
|
||||
return timestamp <= time + tolerance ? 'draw' : 'queue'
|
||||
}
|
||||
@@ -0,0 +1,33 @@
|
||||
export default class Poster {
|
||||
private image: HTMLImageElement | null = null
|
||||
|
||||
cancel(): void {
|
||||
if (!this.image)
|
||||
return
|
||||
this.image.onload = null
|
||||
this.image.onerror = null
|
||||
this.image = null
|
||||
}
|
||||
|
||||
draw(source: string, current: () => boolean, draw: (image: HTMLImageElement) => void, failure: (error: unknown) => void): void {
|
||||
this.cancel()
|
||||
const image = new Image()
|
||||
this.image = image
|
||||
image.onload = () => {
|
||||
if (this.image !== image || !current())
|
||||
return
|
||||
this.cancel()
|
||||
try {
|
||||
draw(image)
|
||||
}
|
||||
catch (error) {
|
||||
failure(error)
|
||||
}
|
||||
}
|
||||
image.onerror = () => {
|
||||
if (this.image === image)
|
||||
this.cancel()
|
||||
}
|
||||
image.src = source
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,192 @@
|
||||
import type { WrappedCanvas } from 'mediabunny'
|
||||
import type EventTarget from './EventTarget'
|
||||
import type { FrameIterator } from './video-frames'
|
||||
import { publish } from './readiness'
|
||||
import { frameAction, readCanvas } from './video-frames'
|
||||
|
||||
export interface RenderHost {
|
||||
events: EventTarget
|
||||
audioClock: { readonly currentTime: number } | null
|
||||
videoIterator: FrameIterator | null
|
||||
nextFrame: WrappedCanvas | null
|
||||
rafId: number
|
||||
asyncId: number
|
||||
duration: number
|
||||
lastTimeUpdate: number
|
||||
timeupdateInterval: number
|
||||
avSyncTolerance: number
|
||||
dropLateFrames: boolean
|
||||
playbackRate: number
|
||||
stalled: boolean
|
||||
isFetching: boolean
|
||||
}
|
||||
|
||||
export default class Renderer {
|
||||
private stopped = false
|
||||
private closed = false
|
||||
private scheduled: number | null = null
|
||||
private fetching: object | null = null
|
||||
|
||||
constructor(private host: RenderHost, private ready: () => boolean, private draw: (frame: WrappedCanvas) => void, private failure: (error: unknown) => void) {}
|
||||
|
||||
private current(id: number): boolean {
|
||||
return !this.closed && !this.stopped && this.host.asyncId === id
|
||||
}
|
||||
|
||||
async update(id: number): Promise<void> {
|
||||
const iterator = this.host.videoIterator
|
||||
if (!iterator || !this.ready() || !this.current(id) || this.host.isFetching)
|
||||
return
|
||||
const request = {}
|
||||
this.fetching = request
|
||||
this.host.isFetching = true
|
||||
const current = () => this.current(id) && this.host.videoIterator === iterator
|
||||
try {
|
||||
while (current()) {
|
||||
const frame = await readCanvas(iterator)
|
||||
if (!current() || !frame)
|
||||
return
|
||||
const time = this.host.audioClock?.currentTime
|
||||
if (time === undefined)
|
||||
return
|
||||
const action = frameAction(frame.timestamp, time, this.host.dropLateFrames, this.host.avSyncTolerance, this.host.playbackRate)
|
||||
if (action === 'skip')
|
||||
continue
|
||||
if (action === 'draw') {
|
||||
this.draw(frame)
|
||||
}
|
||||
else {
|
||||
this.host.nextFrame = frame
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
catch (error) {
|
||||
if (current())
|
||||
throw error
|
||||
}
|
||||
finally {
|
||||
if (this.fetching === request) {
|
||||
this.fetching = null
|
||||
this.host.isFetching = false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
private request(id: number): void {
|
||||
void this.update(id).catch((error) => {
|
||||
if (!this.current(id))
|
||||
return
|
||||
this.stop()
|
||||
this.report(error)
|
||||
})
|
||||
}
|
||||
|
||||
private report(error: unknown): void {
|
||||
try {
|
||||
this.failure(error)
|
||||
}
|
||||
catch (failure) {
|
||||
console.warn('MediaBunny video error listener:', failure)
|
||||
}
|
||||
}
|
||||
|
||||
private cancelFrame(): void {
|
||||
if (this.scheduled === null)
|
||||
return
|
||||
cancelAnimationFrame(this.scheduled)
|
||||
this.scheduled = null
|
||||
}
|
||||
|
||||
private schedule(id: number): void {
|
||||
if (!this.current(id))
|
||||
return
|
||||
this.cancelFrame()
|
||||
const frame = requestAnimationFrame(() => {
|
||||
if (this.scheduled !== frame || !this.current(id))
|
||||
return
|
||||
this.scheduled = null
|
||||
try {
|
||||
this.render()
|
||||
}
|
||||
catch (error) {
|
||||
this.stop()
|
||||
this.report(error)
|
||||
}
|
||||
})
|
||||
this.scheduled = frame
|
||||
this.host.rafId = frame
|
||||
}
|
||||
|
||||
render(): void {
|
||||
const id = this.host.asyncId
|
||||
const current = () => this.current(id)
|
||||
if (!current() || !this.host.audioClock)
|
||||
return
|
||||
const time = this.host.audioClock.currentTime
|
||||
const now = Date.now()
|
||||
if (now - this.host.lastTimeUpdate >= this.host.timeupdateInterval) {
|
||||
this.host.events.emit('timeupdate')
|
||||
if (!current())
|
||||
return
|
||||
this.host.lastTimeUpdate = now
|
||||
}
|
||||
if (!this.ready()) {
|
||||
this.schedule(id)
|
||||
return
|
||||
}
|
||||
if (Number.isFinite(this.host.duration) && time >= this.host.duration) {
|
||||
this.stop()
|
||||
this.host.stalled = false
|
||||
const ended = this.host.asyncId
|
||||
publish(this.host.events, () => !this.closed && this.host.asyncId === ended, ['ended', 'pause', 'canplay'])
|
||||
return
|
||||
}
|
||||
if (this.host.nextFrame && this.host.nextFrame.timestamp <= time) {
|
||||
this.draw(this.host.nextFrame)
|
||||
this.host.nextFrame = null
|
||||
this.request(id)
|
||||
if (this.host.stalled) {
|
||||
publish(this.host.events, current, ['canplay', 'playing'])
|
||||
if (!current())
|
||||
return
|
||||
this.host.stalled = false
|
||||
}
|
||||
}
|
||||
else if (!this.host.nextFrame) {
|
||||
this.request(id)
|
||||
if (Number.isFinite(this.host.duration) && time < this.host.duration && !this.host.stalled) {
|
||||
this.host.stalled = true
|
||||
this.host.events.emit('waiting')
|
||||
}
|
||||
}
|
||||
this.schedule(id)
|
||||
}
|
||||
|
||||
start(clock: { readonly currentTime: number }): void {
|
||||
if (this.closed)
|
||||
return
|
||||
this.stop()
|
||||
this.stopped = false
|
||||
this.host.audioClock = clock
|
||||
this.host.stalled = false
|
||||
if (!this.host.nextFrame)
|
||||
this.request(this.host.asyncId)
|
||||
this.schedule(this.host.asyncId)
|
||||
}
|
||||
|
||||
stop(): void {
|
||||
this.stopped = true
|
||||
this.host.asyncId++
|
||||
this.cancelFrame()
|
||||
this.fetching = null
|
||||
this.host.isFetching = false
|
||||
}
|
||||
|
||||
destroy(): void {
|
||||
if (this.closed)
|
||||
return
|
||||
this.stop()
|
||||
this.closed = true
|
||||
}
|
||||
}
|
||||
Reference in new issue
Block a user