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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| /* eslint-disable @typescript-eslint/typedef */ | ||
| /* eslint-disable @typescript-eslint/explicit-function-return-type */ | ||
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| import { Trigger } from "@akashic/trigger"; | ||
| import type { HTMLAudioAsset } from "./HTMLAudioAsset"; | ||
| import { setupChromeMEIWorkaround } from "./HTMLAudioAutoplayHelper"; | ||
|
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| export interface HTMLAudioPlayerContextParameterObject { | ||
| asset: HTMLAudioAsset; | ||
| } | ||
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| export class HTMLAudioPlayerContext { | ||
| onStop: Trigger<void>; | ||
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| asset: HTMLAudioAsset; | ||
| element: HTMLAudioElement | null; | ||
| offsetStart: number; | ||
| offsetEnd: number; | ||
| loopOffset: number; | ||
| duration: number; | ||
| loop: boolean; | ||
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| _dummyTimerId: number | null; | ||
| _reachEndTimerId: number | null; | ||
| _previousCurrentTime: number; | ||
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| constructor({ asset }: HTMLAudioPlayerContextParameterObject) { | ||
| this.asset = asset; | ||
| this.duration = asset.duration ?? +Infinity; | ||
| this.offsetStart = asset.offset ?? 0; | ||
| this.offsetEnd = this.offsetStart + this.duration; | ||
| this.loop = !!asset.loop; | ||
| this.loopOffset = asset.loopOffset ?? 0; | ||
| this.onStop = new Trigger(); | ||
| this._dummyTimerId = null; | ||
| this._reachEndTimerId = null; | ||
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| const element = asset.cloneElement(); | ||
| if (element) { | ||
| setupChromeMEIWorkaround(element); | ||
| element.addEventListener("timeupdate", this._onTimeupdate, false); | ||
| element.addEventListener("ended", this._onEnded, false); | ||
| element.currentTime = this.offsetStart / 1000; | ||
| } else { | ||
| if (!asset.loop && asset.duration != null) { | ||
| this._setDummyTimer(this.duration); | ||
| } | ||
| } | ||
| this.element = element; | ||
| this._previousCurrentTime = element?.currentTime ?? 0; | ||
| } | ||
|
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| rewind() { | ||
| this.pause(); | ||
| this.setCurrentTime(this.loopOffset || this.offsetStart); | ||
| this.play(); | ||
| } | ||
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| play() { | ||
| this.element?.play().catch((_err) => { | ||
| // user interact の前に play() を呼ぶとエラーになる。これは HTMLAudioAutoplayHelper で吸収する | ||
| }); | ||
| } | ||
|
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| pause() { | ||
| this.element?.pause(); | ||
| this._clearRewindTimer(); | ||
| } | ||
|
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| setCurrentTime(offset: number) { | ||
| if (!this.element) return; | ||
| this.element.currentTime = offset / 1000; | ||
| this._previousCurrentTime = this.element.currentTime; | ||
| } | ||
|
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| setVolume(volume: number) { | ||
| if (!this.element) return; | ||
| this.element.volume = volume; | ||
| } | ||
|
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||
| destroy() { | ||
| this.onStop.destroy(); | ||
| const element = this.element; | ||
| if (element) { | ||
| element.removeEventListener("timeupdate", this._onTimeupdate, false); | ||
| element.removeEventListener("ended", this._onEnded, false); | ||
| } | ||
| this._clearDummyTimer(); | ||
| this._clearRewindTimer(); | ||
| } | ||
|
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| _setDummyTimer(duration: number) { | ||
| this._clearDummyTimer(); | ||
| this._dummyTimerId = window.setTimeout(() => this.pause(), duration); | ||
| } | ||
|
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| _clearDummyTimer() { | ||
| if (this._dummyTimerId == null) return; | ||
| window.clearTimeout(this._dummyTimerId); | ||
| this._dummyTimerId = null; | ||
| } | ||
|
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| _setRewindTimer(duration: number) { | ||
| this._clearRewindTimer(); | ||
| this._reachEndTimerId = window.setTimeout(() => this._onReachEnd(), duration); | ||
| } | ||
|
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| _clearRewindTimer() { | ||
| if (this._reachEndTimerId == null) return; | ||
| window.clearTimeout(this._reachEndTimerId); | ||
| this._reachEndTimerId = null; | ||
| } | ||
|
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| _onReachEnd() { | ||
| if (this.loop) { | ||
| this.rewind(); | ||
| } else { | ||
| this.pause(); | ||
| this.onStop.fire(); | ||
| } | ||
|
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| this._clearRewindTimer(); | ||
| } | ||
|
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| _onTimeupdate = () => { | ||
| const element = this.element!; // this.element が存在する場合にのみ呼び出される | ||
| if (element.paused) return; | ||
|
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||
| const currentOffset = element.currentTime * 1000; | ||
| const deltaSinceLastCall = Math.max(element.currentTime * 1000 - this._previousCurrentTime, 0); | ||
| const deltaUntilEnd = Math.max(this.offsetEnd - element.currentTime * 1000, 0); | ||
| this._previousCurrentTime = element.currentTime * 1000; | ||
|
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| if (this.offsetEnd < currentOffset + deltaSinceLastCall || this.offsetEnd <= currentOffset) { | ||
| this._setRewindTimer(deltaUntilEnd); | ||
| } | ||
| }; | ||
|
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||
| _onEnded = () => { | ||
| this._onReachEnd(); | ||
| }; | ||
| } |