artcraft/app/pages/PageEnigma/js/audio_engine.ts

import { faL } from "@fortawesome/pro-solid-svg-icons";
import { AudioClip } from "../datastructures/clips/audio_clip";

class AudioEngine {
    clips: { [key: string]: AudioClip } = {};
    audio_sources: { [key: string]: AudioBufferSourceNode } = {};
    version: number;
    playing: string[];

    constructor() {
        this.clips = {};
        this.playing = [];
        this.audio_sources = {};
        this.version = 1.0;
    }

    // loads clips into the engine to cache
    loadClip(audio_media_id: string) {
        if(this.clips[audio_media_id] != null) { return; }
        this.clips[audio_media_id] = new AudioClip(this.version, audio_media_id, 1.0);
    }

    // plays from the timeline.
    playClip(audio_media_id: string) {
        if (this.clips[audio_media_id] == null) { this.loadClip(audio_media_id); }
        let clip = this.clips[audio_media_id];
        if (clip.audio_data?.audioContext) {
            if (this.playing.includes(audio_media_id)) { return; }
            this.playing.push(audio_media_id);
            clip.audio_data.source = clip.audio_data.audioContext.createBufferSource();
            clip.audio_data.source.buffer = clip.audio_data.audioBuffer;
            clip.audio_data.source.connect(clip.audio_data.audioContext.destination);
            clip.audio_data.source.start();
            clip.audio_data.source.onended = () => {
                this.playing = this.playing.filter(id => id !== audio_media_id);
            };
            
        } else {
            console.warn(`AudioManager: AudioClip buffer with id "${audio_media_id}" not found.`);
        }
    }

    // stops the clips
    stopClip(audio_media_id: string) {
        const clip = this.clips[audio_media_id];
        if (clip.audio_data?.source) {
            clip.audio_data.source.stop();
        } else {
            console.warn(`AudioManager: AudioClip with id "${audio_media_id}" not found.`);
        }
    }
}

export default AudioEngine;