111 lines
2.8 KiB
JavaScript
111 lines
2.8 KiB
JavaScript
import fs from "node:fs";
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import exec from "node:child_process";
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import _ from "underscore";
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import PCMPlayer from 'pcm-player'
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import pcm from "pcm";
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var min = 1.0;
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var max = -1.0;
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const pcmData = []
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await pcm.getPcmData('/home/boazsender/Downloads/BlackPortal recording April 6 2025.wav', { stereo: true, sampleRate: 44100 },
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function(sample, channel) {
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// Sample is from [-1.0...1.0], channel is 0 for left and 1 for right
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pcmData.push(sample)
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min = Math.min(min, sample);
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max = Math.max(max, sample);
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},
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function(err, output) {
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if (err)
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throw new Error(err);
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console.log('min=' + min + ', max=' + max);
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}
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);
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console.log(pcmData)
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/**
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* [findPeaks Naive algo to identify peaks in the audio data, and wave]
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* @param {[type]} pcmdata [description]
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* @param {[type]} samplerate [description]
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* @return {[type]} [description]
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*/
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function findPeaks(pcmdata, samplerate) {
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const interval = 0.05 * 1000;
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index = 0;
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const step = Math.round(samplerate * (interval / 1000));
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const max = 0;
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const prevmax = 0;
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const prevdiffthreshold = 0.3;
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//loop through song in time with sample rate
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const samplesound = setInterval(
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function () {
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if (index >= pcmdata.length) {
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clearInterval(samplesound);
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console.log("finished sampling sound");
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return;
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}
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for (const i = index; i < index + step; i++) {
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max = pcmdata[i] > max ? pcmdata[i].toFixed(1) : max;
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}
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// Spot a significant increase? Potential peak
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bars = getbars(max);
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if (max - prevmax >= prevdiffthreshold) {
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bars = bars + " == peak == ";
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}
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// Print out mini equalizer on commandline
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console.log(bars, max);
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prevmax = max;
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max = 0;
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index += step;
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},
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interval,
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pcmdata
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);
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}
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/**
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* TBD
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* @return {[type]} [description]
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*/
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function detectBeats() {}
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/**
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* [getbars Visualize image sound using bars, from average pcmdata within a sample interval]
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* @param {[Number]} val [the pcmdata point to be visualized ]
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* @return {[string]} [a set of bars as string]
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*/
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function getbars(val) {
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bars = "";
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for (const i = 0; i < val * 50 + 2; i++) {
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bars = bars + "|";
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}
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return bars;
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}
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/**
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* [Plays a sound file]
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* @param {[string]} soundfile [file to be played]
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* @return {[type]} [void]
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*/
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function playsound(soundfile) {
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// linux or raspi
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// const create_audio = exec('aplay'+soundfile, {maxBuffer: 1024 * 500}, function (error, stdout, stderr) {
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const create_audio = exec(
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"mplayer -loop 0 " + soundfile,
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{ maxBuffer: 1024 * 500 },
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function (error, stdout, stderr) {
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if (error !== null) {
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console.log("exec error: " + error);
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} else {
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//console.log(" finshed ");
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//micInstance.resume();
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}
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}
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);
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}
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