Hi Guys,

All the posts in my blog are related to those topics which I was not knowing and I didn’t even find any good source from where I can get a good solution. I used to post all those issues here so that you may not face the same problem. I got totally frustrated with this issue as well as I found solutions for this but all of them were leading to recording with a heavy noise in them (which is of no profit to me). Finally I got a solution for this which is easy to use and records a clear voice and finally store them as an audio file.

The code is as follows:-

Make variables as follows:

var soundBytes:ByteArray;
var mic:Microphone;

On Start Event:-

soundBytes = new ByteArray();
mic = Microphone.getMicrophone();
mic.encodeQuality = 100;
mic.setSilenceLevel( 0, 6000 );
mic.gain = 60;
mic.rate = 44;

Create a function mic_sampleDataHandler as follows:

function mic_sampleDataHandler(event:SampleDataEvent):void
while (event.data.bytesAvailable)
var sample:Number = event.data.readFloat();

On Stop Event :

soundBytes.position = 0;
var wav:ByteArray = encodeToWav(soundBytes);
var appheader:URLRequestHeader = new URLRequestHeader(“Content-type”,”application/octet-stream”);
var jpgUrlRequest:URLRequest = new URLRequest(‘saveSound.php’);// saveSound.php is the file where you will write the code to save this audio file
jpgUrlRequest.requestHeaders.push( appheader );
jpgUrlRequest.method = “POST”;
jpgUrlRequest.data = wav;
var urlLoader:URLLoader = new URLLoader();
urlLoader.addEventListener( Event.COMPLETE, handleSaveVoiceComplete );
urlLoader.load( jpgUrlRequest );

Function to encode the byte code into wav format

function encodeToWav( data:ByteArray ):ByteArray
var channels:uint = 2;
var BitsPerSample:uint = 16;
var SampleRate:uint = 44100;
var bytes: ByteArray = new ByteArray();
bytes.endian = Endian.LITTLE_ENDIAN;
bytes.writeUTFBytes( ‘RIFF’ );
bytes.writeInt( data.length );
bytes.writeUTFBytes( ‘WAVE’ );
bytes.writeUTFBytes( ‘fmt ‘ );
bytes.writeInt( 16 );
bytes.writeShort( 1 );
bytes.writeShort( channels );
bytes.writeInt( SampleRate );
bytes.writeInt( SampleRate * channels * BitsPerSample / 8 );
bytes.writeShort( channels * BitsPerSample / 8 ); bytes.writeShort( 16 );
bytes.writeUTFBytes( ‘data’ );
bytes.writeUnsignedInt( data.length );
bytes.writeBytes( soundBytes );
bytes.position = 0;
return bytes;

Write the following code in saveSound.php

$name = ‘voice_messages/’. date(‘Uu’). ‘.wav’;

$f = fopen( $name, ‘w+’);

if( fwrite( $f, $GLOBALS[‘HTTP_RAW_POST_DATA’] ) )
echo “path=”.$name;
echo 0;


Hopefully this will help you a lot!!!!!

Posted in: Uncategorized.
Last Modified: September 11, 2014

12 comments on “Audio Recording in flash using AS3

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    1. Kelvin

      This is a great tip. But I was caught more by the psd pesrar you mentioned. I wish I was more proficient with byte arrays. I’ve been looking for a starting point for writing/reading similar data structures. Specifically, compressing files and folders to simulate a file type. Do you know of any libraries or resources for writing and extracting compressed files? Thanks again

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    1. amanchhabra Post author


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