Lofi_Generator/lib/audio/ambientLayer.ts

import * as Tone from 'tone';

export class AmbientLayer {
  private rainNoise: Tone.Noise;
  private vinylNoise: Tone.Noise;
  private rainFilter: Tone.Filter;
  private vinylFilter: Tone.Filter;
  private rainGain: Tone.Gain;
  private vinylGain: Tone.Gain;
  private output: Tone.Gain;
  private lfo: Tone.LFO;

  constructor(destination: Tone.InputNode) {
    this.output = new Tone.Gain(0.4);

    // Rain sound - filtered pink noise
    this.rainNoise = new Tone.Noise('pink');
    this.rainFilter = new Tone.Filter({
      frequency: 3000,
      type: 'lowpass',
      rolloff: -24,
    });
    this.rainGain = new Tone.Gain(0.15);

    // Vinyl crackle - filtered brown noise with modulation
    this.vinylNoise = new Tone.Noise('brown');
    this.vinylFilter = new Tone.Filter({
      frequency: 1500,
      type: 'bandpass',
      Q: 2,
    });
    this.vinylGain = new Tone.Gain(0.1);

    // LFO for subtle rain intensity variation
    this.lfo = new Tone.LFO({
      frequency: 0.1,
      min: 0.1,
      max: 0.2,
    });
    this.lfo.connect(this.rainGain.gain);

    // Chain rain: noise -> filter -> gain -> output
    this.rainNoise.connect(this.rainFilter);
    this.rainFilter.connect(this.rainGain);
    this.rainGain.connect(this.output);

    // Chain vinyl: noise -> filter -> gain -> output
    this.vinylNoise.connect(this.vinylFilter);
    this.vinylFilter.connect(this.vinylGain);
    this.vinylGain.connect(this.output);

    // Output to destination
    this.output.connect(destination);
  }

  start(): void {
    this.rainNoise.start();
    this.vinylNoise.start();
    this.lfo.start();
  }

  stop(): void {
    this.rainNoise.stop();
    this.vinylNoise.stop();
    this.lfo.stop();
  }

  setVolume(volume: number): void {
    this.output.gain.rampTo(volume, 0.1);
  }

  mute(muted: boolean): void {
    this.output.gain.rampTo(muted ? 0 : 0.4, 0.1);
  }

  setRainIntensity(intensity: number): void {
    this.rainGain.gain.rampTo(intensity * 0.2, 0.5);
  }

  setVinylIntensity(intensity: number): void {
    this.vinylGain.gain.rampTo(intensity * 0.15, 0.5);
  }

  dispose(): void {
    this.rainNoise.stop();
    this.vinylNoise.stop();
    this.lfo.stop();
    this.rainNoise.dispose();
    this.vinylNoise.dispose();
    this.rainFilter.dispose();
    this.vinylFilter.dispose();
    this.rainGain.dispose();
    this.vinylGain.dispose();
    this.lfo.dispose();
    this.output.dispose();
  }
}