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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | 1x 3x 1x 2x 2x 49x 1x 48x 48x 48x 7x 49x 48x 17x 41x 41x 41x 41x 41x 41x 41x 41x 41x 12x 1x 11x 2x 2x 11x 11x 11x 11x 11x 11x 11x 11x 3x 3x 2x 2x 44x 44x 44x 3x 44x 3x 44x 44x 44x 44x 44x 44x 44x 1x 1x 1x 1x 1x | export interface IAudioSource {
readonly isPlaying: boolean;
loop: boolean;
volume: number;
play(delay: number, offset: number, duration: number): void;
play(delay: number, offset: number): void;
play(delay: number): void;
play(): void;
pause(): void;
stop(): void;
}
export class AudioSource implements IAudioSource {
private readonly _audioBuffer: AudioBuffer;
private readonly _audioContext: AudioContext;
private readonly _ended: (event: Event) => void;
private _volume: number;
private _isPlaying: boolean;
private _isPaused: boolean;
private _startTime: number;
private _endTime: number;
private _audioNode?: AudioBufferSourceNode;
private _gaineNode?: GainNode;
public get volume(): number {
if (!this._gaineNode)
return 0;
const gain = this._gaineNode.gain;
return gain.value;
}
public set volume(value: number) {
if (!this._gaineNode)
return;
this._volume = value;
const gain = this._gaineNode.gain;
gain.setValueAtTime(this._volume, 0);
}
public get loop(): boolean {
return this._audioNode?.loop ?? false;
}
public set loop(value: boolean) {
if (this._audioNode) {
this._audioNode.loop = value;
}
}
public get isPlaying(): boolean {
return this._isPlaying;
}
public constructor(audioBuffer: AudioBuffer, audioContext: AudioContext) {
this._volume = 1.0;
this._startTime = 0.0;
this._endTime = 0.0;
this._isPlaying = false;
this._isPaused = false;
this._audioBuffer = audioBuffer;
this._audioContext = audioContext;
this._ended = (event: Event): void => this.onEnded(event);
this.createAudioNodes();
}
public play(delay?: number, offset?: number, duration?: number): void {
if (!this._audioNode)
return;
if (this._isPlaying) {
this._audioNode.stop();
this.createAudioNodes();
}
this._isPlaying = true;
const pausedTime = this._isPaused ? this._endTime : undefined;
const offsetTime = offset ?? pausedTime;
this._audioContext.resume();
this._startTime = Date.now();
this._audioNode.addEventListener("ended", this._ended);
this._audioNode.start(delay, offsetTime, duration);
this._isPaused = false;
}
public pause(): void {
this._isPaused = true;
this._audioNode?.stop();
}
public stop(): void {
this._isPaused = false;
this._audioNode?.stop();
}
private createAudioNodes(): void {
let volume = 1.0;
let loop = false;
if (this._audioNode) {
loop = this._audioNode.loop;
}
if (this._gaineNode) {
volume = this._gaineNode.gain.value;
}
this._gaineNode = this._audioContext.createGain();
this._audioNode = this._audioContext.createBufferSource();
this._audioNode.buffer = this._audioBuffer;
this._audioNode.connect(this._gaineNode);
this._gaineNode.connect(this._audioContext.destination);
this.loop = loop;
this.volume = volume;
}
private onEnded(event: Event): void {
this._isPlaying = false;
this._endTime = Date.now() - this._startTime;
const node = <AudioBufferSourceNode>event.target;
node.removeEventListener("ended", this._ended);
this.createAudioNodes();
}
} |