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/**
* Neave Microphone
*
* Copyright (C) 2008 Paul Neave
* http://www.neave.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation at http://www.gnu.org/licenses/gpl.html
*/
package com.neave.media
{
import flash.events.*;
import flash.media.*;
import flash.system.*;
import flash.utils.*;
public class NeaveMicrophone
{
static private var mic:Microphone;
static private var gainTimer:Timer;
public function NeaveMicrophone() { }
/**
* Sets up and returns the microphone object
*
* @return A microphone object
*/
static public function getMicrophone():Microphone
{
// Return the same microphone if it has been successfully requested before
if (mic != null)
{
if (mic.muted) Security.showSettings(SecurityPanel.PRIVACY);
else NeaveMicrophone.startAutoGain();
return mic;
}
gainTimer = new Timer(100);
// Get the microphone
mic = Microphone.getMicrophone();
if (mic != null)
{
// Set properties if a microphone was found
mic.setLoopBack(true);
mic.rate = 44;
mic.gain = 25;
mic.setSilenceLevel(0);
mic.setUseEchoSuppression(true);
mic.soundTransform = new SoundTransform(0); // Mute microphone from sounding on speakers
mic.addEventListener(StatusEvent.STATUS, NeaveMicrophone.statusListener);
return mic;
}
else
{
// No microphone found
Security.showSettings(SecurityPanel.MICROPHONE);
return new Microphone();
}
}
/**
* Microphone status response
*/
static private function statusListener(e:StatusEvent):void
{
if (e.code == "Microphone.Unmuted") NeaveMicrophone.startAutoGain();
else NeaveMicrophone.stopAutoGain();
}
/**
* Set up gain control
*/
static public function startAutoGain():void
{
gainTimer.start();
if (!gainTimer.hasEventListener(TimerEvent.TIMER)) gainTimer.addEventListener(TimerEvent.TIMER, setGain);
}
/**
* Stop gain control
*/
static public function stopAutoGain():void
{
gainTimer.stop();
gainTimer.reset();
gainTimer.removeEventListener(TimerEvent.TIMER, setGain);
}
/**
* Dynamically adjust the microphone's gain value
*/
static private function setGain(e:TimerEvent):void
{
if (mic.activityLevel < 15) mic.gain = 30;
else if (mic.activityLevel > 90) mic.gain = 20;
else mic.gain = 25;
}
}
}
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