topical media & game development
#graphic-player-10-cube-com-adobe-flash-samples-MorseCode.ax
#graphic-player-10-cube-com-adobe-flash-samples-MorseCode.ax
[swf]
[flash]
flex
package com.adobe.flash.samples
{
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.net.URLRequest;
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.events.SampleDataEvent;
import flash.utils.ByteArray;
Used in the Adobe Dynamic Sound quick start example applications.
The class includes a morsePlayString() function, which generates International
Morse Code audio based on a string.
public class @ax-graphic-player-10-cube-com-adobe-flash-samples-MorseCode extends EventDispatcher
{
An array that maps Morse codes to characters.
public static var codes:Array = [];
codes["a"] = ".-"; codes["b"] = "-..."; codes["c"] = "-.-."; codes["d"] = "-..";
codes["e"] = "."; codes["f"] = "..-."; codes["g"] = "--."; codes["h"] = "....";
codes["i"] = ".."; codes["j"] = ".---"; codes["k"] = "-.-"; codes["l"] = ".-..";
codes["m"] = "--"; codes["n"] = "-."; codes["o"] = "---"; codes["p"] = ".--.";
codes["q"] = "--.-"; codes["r"] = ".-."; codes["s"] = "..."; codes["t"] = "-";
codes["u"] = "..-"; codes["v"] = "...-"; codes["w"] = "..-"; codes["x"] = "-..-";
codes["y"] = "-.--"; codes["z"] = "--.."; codes["0"] = "-----"; codes["1"] = ".----";
codes["2"] = "..---"; codes["3"] = "...--"; codes["4"] = "....-"; codes["5"] = ".....";
codes["6"] = "-...."; codes["7"] = "--..."; codes["8"] = "---.."; codes["9"] = "----.";
codes["."] = ".-.-.-"; codes[","] = "--..--"; codes["?"] = "..--.."; codes["-"] = "-....-";
codes["'"] = ".---."; codes["!"] = "-.-.--"; codes[" "] = " ";
private var codeSound:Sound; // Used to play the Morse code audio.
private var soundChannel:SoundChannel; // Used to stop the sound.
private var soundBytes:ByteArray; // Used to store the audio sample bytes used by the codeSound object.
public function @ax-graphic-player-10-cube-com-adobe-flash-samples-MorseCode():void
{
}
Generates Morse code audio based on a string. The sampleData event handler
for the codeSound object generates audio sample data used by the codeSound object.
public function playString(string:String):void
{
var codeString:String = stringToCode(string);
soundBytes = codeStringToBytes(codeString);
soundBytes.position = 0;
codeSound = new Sound();
codeSound.addEventListener(SampleDataEvent.SAMPLE_DATA, addSoundBytesToSound);
soundChannel = codeSound.play();
soundChannel.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);
}
Notifies the host application that the sound is done playing.
public function soundCompleteHandler(event:Event):void
{
dispatchEvent(event);
}
Stops the sound, and notifies the host application that the sound is done playing.
public function stop():void
{
soundChannel.stop();
dispatchEvent(new Event(Event.SOUND_COMPLETE));
}
Converts a String, such as "abc 123", into a Morse code string, such as
".- -... -.-. .---- ..--- ...--". The codes Array maps characters to
their Morse code equivalents.
public static function stringToCode(string:String):String
{
var returnString:String = "";
for (var i:int = 0; i < string.length; i++)
{
var char:String = string.charAt(i).toLowerCase();
if (codes[char] != undefined)
{
returnString += codes[char] + " ";
}
else
{
returnString += " ";
}
}
return returnString;
}
Converts a string of Morse code characters, such as "".- -... -.-.", into a byte array
of audio data that can be played by a Sound object.
private function codeStringToBytes(string:String):ByteArray
{
var returnBytes:ByteArray = new ByteArray();
for (var i:int = 0; i < string.length; i++)
{
var char:String = string.charAt(i);
switch (char)
{
case "." :
returnBytes.writeBytes(sineWaveGenerator(1))
returnBytes.writeBytes(silenceGenerator(1));
break;
case "-" :
returnBytes.writeBytes(sineWaveGenerator(3));
returnBytes.writeBytes(silenceGenerator(1));
break;
default :
returnBytes.writeBytes(silenceGenerator(2));
}
}
return returnBytes;
}
Event handler for the sampleData event, which the codeSound Sound object dispatches
to request audio data. The method adds 8192 audio samples to the audio buffer of the
Sound object. (Each sample is two four-byte floating point numbers).
private function addSoundBytesToSound(event:SampleDataEvent):void
{
var bytes:ByteArray = new ByteArray();
soundBytes.readBytes(bytes, 0, Math.min(soundBytes.bytesAvailable, 8 * 8192));
event.data.writeBytes(bytes, 0, bytes.length);
}
Generates sine wave audio data of a specified length. A short Morse code character (".")
has lenth == 1, generating a sine wave of 2000 samples. A long Morse code character ("-")
has lenth == 3, generating a sine wave of 6000 samples.
private function sineWaveGenerator(length:Number):ByteArray {
var returnBytes:ByteArray = new ByteArray();
for ( var i:int = 0; i < length * 2400; i++ )
{
var value:Number = Math.sin( i / 6) * 0.5;
returnBytes.writeFloat(value);
returnBytes.writeFloat(value);
}
return returnBytes;
}
Generates silent audio data of a specified length.
private function silenceGenerator(length:Number):ByteArray
{
var returnBytes:ByteArray = new ByteArray();
for (var i:int=0; i < length * 2400; i++ )
{
returnBytes.writeFloat(0);
returnBytes.writeFloat(0);
}
return returnBytes;
}
}
}
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
