Quick-Sonic-Worklet Library

Quick-Sonic-Worklet is a TypeScript library designed to streamline the downloading, decoding, and playback of audio files using Web Workers and AudioWorklet. It supports multi-track playback, master volume control, and professional-grade audio effects.

Features

• Worker-based Audio Downloading: Offload audio file downloads to a Web Worker for efficient background processing.
• Main Thread Decoding & Playback: Use decodeAudioData and AudioWorklet for high-performance audio decoding and playback.
• Multi-Track Support: Play multiple audio tracks simultaneously with individual controls.
• Professional Audio Effects: EQ, modulation (chorus/flanger/vibrato), Schroeder reverb, delay, echo, drive, and dynamics.
• Real-time Parameter Control: All effects can be adjusted in real-time during playback.
• Visualizer Integration: Real-time visualizer data handling for audio visualization.
• Master Volume & Low-Pass Filter: Control overall volume and apply global audio filters.

Installation

npm install quick-sonic-worklet

Usage

Importing the Library

import { AudioPreloader } from "./AudioPreloader";
import { AudioLoadWorker } from "./AudioLoader.worker";

Initialization

const fileMap = {
	track1: "audio/track1.mp3",
	track2: "audio/track2.mp3",
};

const preloader = new AudioPreloader(
	"https://example.com/",
	fileMap,
	AudioLoadWorker
);

Loading and Decoding Audio

await preloader.loadAll();
await preloader.decodeAll();
await preloader.initAudioWorklet(workletUrl);

Playing Audio

preloader.playAudio("track1", true, 1.5);  // loop, 1.5x speed
preloader.adjustVolume("track1", 0.8);
preloader.stopAudio("track1");

Audio Effects

EQ (Equalizer)

preloader.adjustEQ("track1", [
	{ frequency: 60, gain: 5 },      // Bass boost (+5dB)
	{ frequency: 1000, gain: -3 },   // Mid cut (-3dB)
	{ frequency: 8000, gain: 2 },    // Treble boost (+2dB)
]);

Modulation Effects

Type	Description
chorus	Rich, layered sound with delayed signal
flanger	Jet-like sweeping effect
vibrato	Pitch modulation
tremolo	Amplitude modulation
ring	Ring modulation
square / triangle / sawtooth	Waveform-based modulation

preloader.adjustModulation("track1", {
	type: "chorus",   // Modulation type
	depth: 0.5,       // 0.0 ~ 1.0
	rate: 2.0         // Hz
});

Reverb (Schroeder Reverb)

Using Presets

Preset	Decay	Diffusion	Description
small	0.70	0.40	Small room
medium	0.80	0.50	Medium room
large	0.85	0.55	Large room
hall	0.90	0.60	Concert hall
plate	0.88	0.70	Plate reverb
cathedral	0.95	0.65	Cathedral

preloader.adjustEffects("track1", {
	reverb: 0.5,        // Wet/dry mix (0~1)
	roomSize: "hall"    // Preset
});

Custom Parameters

preloader.adjustEffects("track1", {
	reverb: 0.5,
	reverbDecay: 0.9,      // Decay time (0~1)
	reverbDiffusion: 0.6   // Diffusion (0~1)
});

Delay & Echo

preloader.adjustEffects("track1", {
	delay: 300,   // Delay time in ms (0~2000)
	echo: 200     // Echo time in ms (0~1000, multi-tap)
});

Drive Effects

preloader.adjustDrive("track1", {
	distortion: 0.5,   // Hard clipping (0~1)
	overdrive: 0.3,    // Soft clipping (0~1)
	fuzz: 0.7          // Asymmetric clipping + harmonics (0~1)
});

Dynamics (Compressor)

preloader.adjustDynamics("track1", {
	threshold: -24,   // dB (-60 ~ 0)
	ratio: 4          // Compression ratio (1 ~ 20)
});

Latency Control

preloader.adjustLatency("track1", 50);         // 50ms delay
preloader.adjustLatencySamples("track1", 2400); // 2400 samples delay

Visualizer

preloader.setVisualizerDataHandler((data) => {
	console.log("Band levels:", data);
});

preloader.setVisualizerBands("", [
	{ startFrequency: 20, endFrequency: 200 },
	{ startFrequency: 200, endFrequency: 2000 },
	{ startFrequency: 2000, endFrequency: 20000 },
]);

preloader.setVisualizerBufferSize(256);  // 32~1024

API Reference

Methods

Method	Description
loadAll()	Download all audio files
decodeAll()	Decode all downloaded audio
initAudioWorklet(url)	Initialize AudioWorklet
playAudio(key, loop?, rate?)	Play a track
stopAudio(key)	Stop a track
clearAudio(key)	Remove track from memory
adjustVolume(key, volume)	Set track volume (0~1)
adjustEQ(key, bands)	Apply EQ settings
adjustModulation(key, settings)	Apply modulation
adjustEffects(key, settings)	Apply delay/reverb/echo
adjustDrive(key, settings)	Apply drive effects
adjustDynamics(key, settings)	Apply compression
adjustLatency(key, ms)	Set latency in ms
adjustLatencySamples(key, samples)	Set latency in samples
adjustNormalize(key, flag)	Enable/disable normalization
setMasterVolume(volume)	Set master volume
setLowPassFilter(cutoff, Q)	Apply low-pass filter
setVisualizerDataHandler(callback)	Set visualizer callback
setVisualizerBands(key, bands)	Configure visualizer bands
setVisualizerBufferSize(size)	Set FFT buffer size
resumeContext()	Resume AudioContext
suspendContext()	Suspend AudioContext
releaseAllResources()	Release all resources

Properties

Property	Description
progress	Loading progress (0~1)
downloadedCount	Downloaded file count
downloadedTotal	Total file count
loaded	All files loaded

License

MIT License