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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| import { assertIsDefined } from "../utils/asserts"; | ||
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| export enum AudioResourceState { | ||
| LOADING, | ||
| READY, | ||
| ERROR // Just in case I may decide to try again due to network issues... | ||
| }; | ||
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| export type AudioResourceListener = (resource: AudioResource) => void; | ||
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| export class AudioResource { | ||
| private state: AudioResourceState = AudioResourceState.LOADING; | ||
| private buffer: AudioBuffer | undefined; | ||
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| constructor(public readonly url: string, context: AudioContext, listener: AudioResourceListener) { | ||
| const request = new XMLHttpRequest(); | ||
| request.responseType = 'arraybuffer'; | ||
| request.open('GET', url, true); | ||
| request.onload = () => { | ||
| context.decodeAudioData(request.response, | ||
| buffer => { | ||
| this.buffer = buffer; | ||
| this.state = AudioResourceState.READY; | ||
| listener(this); | ||
| }, | ||
| e => { | ||
| this.state = AudioResourceState.ERROR; | ||
| console.error(`Error decoding audio data from resource "${url}".`, e); | ||
| }); | ||
| }; | ||
| request.onerror = () => { | ||
| this.state = AudioResourceState.ERROR; | ||
| console.error(`Error loading audio resource "${url}"`); | ||
| }; | ||
| request.send(); | ||
| } | ||
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| getBuffer(): AudioBuffer { | ||
| assertIsDefined(this.buffer, `Trying to use an invalid AudioResource: ${this.url}`); | ||
| return this.buffer; | ||
| } | ||
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| get isReady(): boolean { return this.state === AudioResourceState.READY; } | ||
| } | ||
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| interface AudioResourceWrapper { | ||
| resource: AudioResource; | ||
| listeners: AudioResourceListener[]; | ||
| } | ||
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| export class AudioResourceManager { | ||
| private resources: Map<string, AudioResourceWrapper> = new Map(); | ||
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| constructor(private context: AudioContext) { } | ||
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| load(url: string, listener: AudioResourceListener): AudioResource { | ||
| let wrapper = this.resources.get(url); | ||
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| if (!wrapper) { | ||
| const resource = new AudioResource(url, this.context, resource => this.onResourceLoaded(resource)); | ||
| wrapper = { resource, listeners: [listener] }; | ||
| this.resources.set(url, wrapper); | ||
| } else if (!wrapper.resource.isReady) { | ||
| wrapper.listeners.push(listener); | ||
| } | ||
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| return wrapper.resource; | ||
| } | ||
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| private onResourceLoaded(resource: AudioResource) { | ||
| const wrapper = this.resources.get(resource.url); | ||
| assertIsDefined(wrapper); | ||
| wrapper.listeners.forEach(l => l(resource)); | ||
| wrapper.listeners.length = 0; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| import { AudioResourceManager } from "./audioResources"; | ||
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| export class AudioClip { | ||
| private audioSource: AudioBufferSourceNode | undefined; | ||
| private gainNode: GainNode | undefined; | ||
| private _rate = 1.0; | ||
| private _gain = 1.0; | ||
| private started = false; | ||
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| constructor(url: string, private context: AudioContext, resources: AudioResourceManager, private loop: boolean) { | ||
| resources.load(url, resource => { | ||
| this.audioSource = new AudioBufferSourceNode(context, { buffer: resource.getBuffer(), loop, playbackRate: this._rate }); | ||
| this.gainNode = new GainNode(context, { gain: this._gain }); | ||
| this.audioSource.connect(this.gainNode).connect(context.destination); | ||
| }); | ||
| } | ||
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| set rate(value: number) { | ||
| this._rate = value; | ||
| if (this.audioSource) { | ||
| this.audioSource.playbackRate.value = value; | ||
| } | ||
| } | ||
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| set gain(value: number) { | ||
| this._gain = value; | ||
| if (this.gainNode) { | ||
| this.gainNode.gain.value = value; | ||
| } | ||
| } | ||
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| play() { | ||
| if (!this.started) { | ||
| this.started = true; | ||
| this.audioSource?.start(); | ||
| } else { | ||
| this.gainNode?.connect(this.context.destination); | ||
| } | ||
| } | ||
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| stop() { | ||
| this.gainNode?.disconnect(this.context.destination); | ||
| } | ||
| } | ||
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| export class AudioSystem { | ||
| private context = new AudioContext(); | ||
| private resources = new AudioResourceManager(this.context); | ||
| private globals: Map<string, AudioClip> = new Map(); | ||
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| getGlobal(url: string, loop: boolean): AudioClip { | ||
| let clip = this.globals.get(url); | ||
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| if (!clip) { | ||
| clip = new AudioClip(url, this.context, this.resources, loop); | ||
| this.globals.set(url, clip); | ||
| } | ||
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| return clip; | ||
| } | ||
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| getInstance(url: string, loop: boolean): AudioClip { | ||
| return new AudioClip(url, this.context, this.resources, loop); | ||
| } | ||
| } |
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