Конвертирование WAV в MP3

channels = 1; //1 for mono or 2 for stereo 
sampleRate = 44100; //44.1khz (normal mp3 samplerate) 
kbps = 128; //encode 128kbps mp3 
mp3encoder = new lamejs.Mp3Encoder(channels, sampleRate, kbps); 
var mp3Data = []; 
  
samples = new Int16Array(44100); //one second of silence (get your data from the source you have) 
sampleBlockSize = 1152; //can be anything but make it a multiple of 576 to make encoders life easier 
  
var mp3Data = []; 
for (var i = 0; i < samples.length; i += sampleBlockSize) { 
  sampleChunk = samples.subarray(i, i + sampleBlockSize); 
  var mp3buf = mp3encoder.encodeBuffer(sampleChunk); 
  if (mp3buf.length > 0) { 
      mp3Data.push(mp3buf); 
  } 
} 
var mp3buf = mp3encoder.flush();   //finish writing mp3 
  
if (mp3buf.length > 0) { 
    mp3Data.push(new Int8Array(mp3buf)); 
} 
  
var blob = new Blob(mp3Data, {type: 'audio/mp3'}); 
var url = window.URL.createObjectURL(blob); 
console.log('MP3 URl: ', url);

mp3encoder = new lamejs.Mp3Encoder(2, 44100, 128); 
var mp3Data = []; 
  
left = new Int16Array(44100); //one second of silence (get your data from the source you have) 
right = new Int16Array(44100); //one second of silence (get your data from the source you have) 
sampleBlockSize = 1152; //can be anything but make it a multiple of 576 to make encoders life easier 
  
for (var i = 0; i < samples.length; i += sampleBlockSize) { 
  leftChunk = left.subarray(i, i + sampleBlockSize); 
  rightChunk = right.subarray(i, i + sampleBlockSize); 
  var mp3buf = mp3encoder.encodeBuffer(leftChunk, rightChunk); 
  if (mp3buf.length > 0) { 
    mp3Data.push(mp3buf); 
  } 
} 
var mp3buf = mp3encoder.flush();   //finish writing mp3 
  
if (mp3buf.length > 0) { 
    mp3Data.push(mp3buf); 
} 
  
console.log(mp3Data);

function convertWAVToMP3(audioData) 
{ 
    var wav = lamejs.WavHeader.readHeader(new DataView(audioData)) 
  
    var samples = new Int16Array(audioData, wav.dataOffset, wav.dataLen / 2) 
     
    var buffer = [] 
    var mp3enc = new lamejs.Mp3Encoder(wav.channels, wav.sampleRate, 128) 
    var remaining = samples.length 
    var maxSamples = 1152 
  
    for ( var i = 0; remaining >= maxSamples; i += maxSamples ) { 
        var mono = samples.subarray(i, i + maxSamples) 
        var mp3buf = mp3enc.encodeBuffer(mono) 
        if ( mp3buf.length > 0 ) { 
            buffer.push(new Int8Array(mp3buf)) 
        } 
        remaining -= maxSamples 
    } 
  
    var d = mp3enc.flush() 
    if ( d.length > 0 ) { 
        buffer.push(new Int8Array(d)) 
    } 
     
    return buffer 
}