Collect audio property values

[abrahamjuliot]

No description provided.

[abrahamjuliot]

Concept inspired by https://audiofingerprint.openwpm.com:
https://es6console.com/kd9pjq7z/

const hashMini = str => {
  const json = `${JSON.stringify(str)}`
  let i, len, hash = 0x811c9dc5
  for (i = 0, len = json.length; i < len; i++) {
    hash = Math.imul(31, hash) + json.charCodeAt(i) | 0
  }
  return ('0000000' + (hash >>> 0).toString(16)).substr(-8)
}

const getAudioProps = () => {
  const contextOffline = OfflineAudioContext || webkitOfflineAudioContext
  const audioOffline = new contextOffline(1, 44100, 44100)
  const oscillator = audioOffline.createOscillator()
  const dynamicsCompressor = audioOffline.createDynamicsCompressor()
  const analyser = audioOffline.createAnalyser()
  const biquadFilter = audioOffline.createBiquadFilter()

  const audioData = {
    analyserChannelCount: analyser.channelCount,
    analyserChannelCountMode: analyser.channelCountMode,
    analyserChannelInterpretation: analyser.channelInterpretation,
    analyserSampleRate: analyser.context.sampleRate,
    analyserFftSize: analyser.fftSize,
    analyserFrequencyBinCount: analyser.frequencyBinCount,
    analyserMaxDecibels: analyser.maxDecibels,
    analyserMinDecibels: analyser.minDecibels,
    analyserNumberOfInputs: analyser.numberOfInputs,
    analyserNumberOfOutputs: analyser.numberOfOutputs,
    analyserSmoothingTimeConstant: analyser.smoothingTimeConstant,
    analyserContextListenerForwardXMax: analyser.context.listener.forwardX.maxValue,
    dynamicsCompressorAttackDefault: dynamicsCompressor.attack.defaultValue,
    dynamicsCompressorKneeDefault: dynamicsCompressor.knee.defaultValue,
    dynamicsCompressorKneeMax: dynamicsCompressor.knee.maxValue,
    dynamicsCompressorRatioDefault: dynamicsCompressor.ratio.defaultValue,
    dynamicsCompressorRatioMax: dynamicsCompressor.ratio.maxValue,
    dynamicsCompressorReleaseDefault: dynamicsCompressor.release.defaultValue,
    dynamicsCompressorReleaseMax: dynamicsCompressor.release.maxValue,
    dynamicsCompressorThresholdDefault: dynamicsCompressor.threshold.defaultValue,
    dynamicsCompressorThresholdMin: dynamicsCompressor.threshold.minValue,
    oscillatorDetuneMax: oscillator.detune.maxValue,
    oscillatorDetuneMin: oscillator.detune.minValue,
    oscillatorFrequencyDefault: oscillator.frequency.defaultValue,
    oscillatorFrequencyMax: oscillator.frequency.maxValue,
    oscillatorFrequencyMin: oscillator.frequency.minValue,
    biquadFilterGainMax: biquadFilter.gain.maxValue,
    biquadFilterFrequencyMax: biquadFilter.frequency.maxValue,
    biquadFilterFrequencyMin: biquadFilter.frequency.minValue
  }
  //console.log(biquadFilter)
  
  return audioData

}

a = getAudioProps()
console.log(a)