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