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audio-analyser

1.0.2 • Public • Published

Audio analyser stream. Provides API of the AnalyserNode for audio-streams. In all respects can be used in the same way.

Usage

npm install audio-analyser

var Analyser = require('audio-analyser');
var Generator = require('audio-generator');
 
 
var analyser = new Analyser({
    // Magnitude diapasone, in dB
    minDecibels: -100,
    maxDecibels: -30,
 
    // Number of time samples to transform to frequency
    fftSize: 1024,
 
    // Number of frequencies, twice less than fftSize
    frequencyBinCount: 1024/2,
 
    // Smoothing, or the priority of the old data over the new data
    smoothingTimeConstant: 0.2,
 
    // Number of channel to analyse
    channel: 0,
 
    // Size of time data to buffer
    bufferSize: 44100,
 
    // Windowing function for fft, https://github.com/scijs/window-functions
    applyWindow: function (sampleNumber, totalSamples) {
    }
 
    //...pcm-stream params, if required
});
 
 
//AnalyserNode methods
 
// Copies the current frequency data into a Float32Array array passed into it.
analyser.getFloatFrequencyData(arr);
 
// Copies the current frequency data into a Uint8Array passed into it.
analyser.getByteFrequencyData(arr);
 
// Copies the current waveform, or time-domain data into a Float32Array array passed into it.
analyser.getFloatTimeDomainData(arr);
 
// Copies the current waveform, or time-domain data into a Uint8Array passed into it.
analyser.getByteTimeDomainData(arr);
 
 
//Shortcut methods
 
//return array with frequency data in decibels of size <= fftSize
analyser.getFrequencyData(size);
 
//return array with time data of size <= self.bufferSize (way more than fftSize)
analyser.getTimeData(size);
 
 
//Can be used both as a sink or pass-through
Generator().pipe(analyser);

Related

audio-render — render audio streams.
audio-spectrum — render audio spectrum.
audio-spectrogram — render audio spectrogram.
audio-waveform — render audio waveform.
audio-stat — render any kind of audio info: waveform, spectrogram etc.
pcm-util — utils for work with pcm-streams.
ndarray-fft — implementation of fft for ndarrays.

Install

npm i audio-analyser

DownloadsWeekly Downloads

62

Version

1.0.2

License

MIT

Last publish

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