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

}