Voice are not clear. Audio having distortion

[durgadp]

I am using your lamejs for recording voice and convert into mp3. Below is audio link what i am exactly facing the problem after recording Distorted Audio : https://www.ptemocktest.com/pte/uploaddata/answer-audio/d3cd0a153620a3ddb12e09c31c3f7bbd.mp3

This is configuration i am using to record

var mp3Encoder, maxSamples = 1152, samplesMono, config, dataBuffer; var clearBuffer = function () { dataBuffer = []; };

var appendToBuffer = function (mp3Buf) { dataBuffer.push(new Int8Array(mp3Buf)); };

var init = function (prefConfig) { config = prefConfig || {debug: true}; mp3Encoder = new lamejs.Mp3Encoder(1, config.sampleRate || 48000, config.bitRate || 128); clearBuffer(); };

Please help where i am doing wrong with configuration.

[zhuker]

i cant tell from looking at the code but it looks like you are not feeding the encoder properly

[durgadp]

Please let me help what i need to be code for encoder properly

[zhuker]

sounds like you are calling flush() too often, try calling it only at the end of encode

[durgadp]

Can I share the code file with you? You want me to call flush after sending to the server or before.

[zhuker]

Can I share the code file with you? You want me to call flush after sending to the server or before.

Post the most relevant snippet here, i'll take a look

[durgadp]

/**

• Created by intelWorx on 27/10/2015. */ (function () { 'use strict';

console.log('MP3 conversion worker started.'); importScripts('https://www.ptemocktest.com/pte/public/customjs/js/lame.min.js');

var mp3Encoder, maxSamples = 1152, samplesMono, config, dataBuffer; var clearBuffer = function () { dataBuffer = []; };

var appendToBuffer = function (mp3Buf) { dataBuffer.push(new Int8Array(mp3Buf)); };

var init = function (prefConfig) { config = prefConfig || {debug: true}; mp3Encoder = new lamejs.Mp3Encoder(1, config.sampleRate || 48000, config.bitRate || 128); clearBuffer(); };

var floatTo16BitPCM = function floatTo16BitPCM(input, output) { //var offset = 0; for (var i = 0; i < input.length; i++) { var s = Math.max(-1, Math.min(1, input[i])); output[i] = (s < 0 ? s * 0x8000 : s * 0x7FFF); } };

var convertBuffer = function(arrayBuffer){ var data = new Float32Array(arrayBuffer); var out = new Int16Array(arrayBuffer.length); floatTo16BitPCM(data, out) return out; };

var encode = function (arrayBuffer) { samplesMono = convertBuffer(arrayBuffer); var remaining = samplesMono.length; for (var i = 0; remaining >= 0; i += maxSamples) { var left = samplesMono.subarray(i, i + maxSamples); var mp3buf = mp3Encoder.encodeBuffer(left); appendToBuffer(mp3buf); remaining -= maxSamples; }

};

var finish = function () { appendToBuffer(mp3Encoder.flush()); self.postMessage({ cmd: 'end', buf: dataBuffer }); if (config.debug) { console.log('Sending finished command'); } clearBuffer(); //free up memory };

self.onmessage = function (e) { switch (e.data.cmd) { case 'init': init(e.data.config); break;

  case 'encode':
    encode(e.data.buf);
    break;

  case 'finish':
    finish();
    break;
}

};

})();

[zhuker]

    var data = new Float32Array(arrayBuffer);
    var out = new Int16Array(arrayBuffer.length);

change to

    var data = new Float32Array(arrayBuffer);
    var out = new Int16Array(data.length);

[durgadp]

I have tried by replace this code but still facing same issue. Please let me know where i am doing wrong with code.

[zhuker]

can you create an end-to-end example i can reproduce here? i mean no worker code, no messages

[durgadp]

Above is my file please let me know which code i need to remove from it.

[zhuker]

I can’t reproduce the problem using the code you posted.

Sent from my iPhone

On Sep 16, 2019, at 6:05 PM, Durga Parshad [email protected] wrote:

Above is my file please let me know which code i need to remove from it.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

[zhuker]

arrayBuffer passed to your var encode = function (arrayBuffer) { must be of size divisible by 1152 * 4 if size is different encoder will produce the clicks you are hearing

[durgadp]

What i need to do for 1152 * 4 into my encode function so it will ignore

[lostrepo]

@durgadp I'm testing lamejs as fallback for vmsgjs right now. Here is my handling of this limitation (mono sound example).

// assumes that t - is some sort of object, in my case it's vmsgjs Recorder instance
t.len = 0;
// List of valid buffSize values can be found here:
// https://developer.mozilla.org/en-US/docs/Web/API/BaseAudioContext/createScriptProcessor
// To use buffSize = 256 change t.samplesInFrame to 18. In other cases you don't change it
t.buffSize = 1024;
t.samplesInFrame = 9;
t.sampleFrameSize = t.buffSize * t.samplesInFrame;
t.unsentSamples = [];

function startRecording(){
  // assumes that
  //  t.encNode = (t.audioCtx.createScriptProcessor || t.audioCtx.createJavaScriptNode)
  //              .call(t.audioCtx, t.buffSize, inputChannelsNumber, outputChannelsNumber)
  t.encNode.onaudioprocess = function(e){
   // create new array so data won't be corrupted, references suck sometimes
   t.unsentSamples[t.len++]	=	new Float32Array(e.inputBuffer.getChannelData(0));
    if (!(t.len % t.samplesInFrame)){
      t.worker.postMessage({
         cmd: 'encode',
         data: { buf: concatSamples(t.unsentSamples, t.sampleFrameSize) }
      });
      t.len = 0;
      t.unsentSamples = [];
    }
  }
  t.encNode.connect(t.audioCtx.destination);
}

function stopRecording(){
  t.len = 0;
  t.unsentSamples = [];
  t.encNode.onaudioprocess = null;
  t.unsentSamples && t.unsentSamples.length && t.worker.postMessage({
    cmd: 'encode',
    data: {
       buf: concatSamples(t.unsentSamples, t.sampleFrameSize)
    }
 });
 t.worker.postMessage({ cmd: 'finish' });
 // disconnect Nodes, destroy stuff
}

// concatenate audio samples
// if not enough samples passed we will still return valid Float32Array
// when totalLength passed divisible by 4608 = 1152*4
// samples - array of Float32Arrays
// totalLength - combined length of Float32Arrays in samples
function concatSamples(samples, totalLength){
  var l = samples.length,
  len = 0,
  res = new Float32Array(totalLength);		
  for (var i = 0; i < l; i++){
    res.set(samples[i], len);
    len += samples[i].length;
  }
  return res;
}

Hope this helps others to work around this limitation.

[durgadp]

sounds like you are calling flush() too often, try calling it only at the end of encode

What do you mean by calling flush() too often?

[durgadp]

t.sampleFrameSize

var remaining = samplesMono.length; I am getting 2048 length here which is divisible by 4. Help me if i am doing any thing wrong.