unnormalized / quiet video fix

audio-gain-eq-adjust.js

let nodes = {}
const audioCtx = new AudioContext()
const getNodes = ()=>{
  if(nodes.eq) return nodes
  const videoElement = document.querySelector("video")
  const source = audioCtx.createMediaElementSource(videoElement)
  nodes['gain'] = audioCtx.createGain()
  nodes['eq'] = audioCtx.createBiquadFilter();
  nodes['eq'].type = "bandpass";
  source.connect(nodes['gain'])
  nodes['gain'].connect(nodes['eq'])
  nodes['eq'].connect(audioCtx.destination)
  return nodes
}
const setDetune = (v) => { getNodes().eq.detune.setValueAtTime(v, audioCtx.currentTime); }
const setGain = (v) => { getNodes().eq.gain.setValueAtTime(v, audioCtx.currentTime) ;}
const setQ = (v) => { getNodes().eq.Q.setValueAtTime(v, audioCtx.currentTime); }
const setFreq = (v) => { getNodes().eq.frequency.setValueAtTime(v, audioCtx.currentTime); }
const eq = (f,q,g,d=0) => {
    setFreq(f);
    setQ(q);
    setGain(g);
    setDetune(d);
}

const incVol = (gain=2)=>{
  getNodes().gain.value *= gain
}
incVol(2)
eq(900, 1.5, 1)