Georg Feil - Synth Sample 1985

Georg Feil - Synth Sample 1985

This is not considered as a tutorial rather optimized to smaller file size.

FP10 Sound Demo

@author Andre Michelle - http://blog.andre-michelle.com
@author Martin Jonasson - (slimmed down 469 bytes or about 20%) http://prototyprally.com/

grapefrukt

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license : All rights reserved
modified : 2009-02-28 22:16:27

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package  
{
	import flash.display.Sprite;
	import flash.media.Sound;
	import flash.utils.ByteArray;

/**
	 * Georg Feil - Synth Sample 1985
	 * 
	 * This is not considered as a tutorial rather optimized to smaller file size.
	 * 
	 * FP10 Sound Demo
	 * 
	 * @author Andre Michelle - http://blog.andre-michelle.com
	 * @author Martin Jonasson - (slimmed down 469 bytes or about 20%) http://prototyprally.com/
	 */
	[SWF(width='408',height='284',frameRate='44',backgroundColor='0xa0a0ff')]
	public class SS extends Sprite 
	{
		//-- SOUND REGISTER
		//-- PitchPhase, PitchPhaseIncr, PulsePhase, Volume, Pan, LowPass
		private const sr: Vector.<Number> = new Vector.<Number>( 18, true );

//-- DATA
		private const bd: ByteArray = new ByteArray;
		private const md: ByteArray = new ByteArray;
		
		//-- QUARTER INDEX AND SAMPLE POSITION
		private var qi: int;
		private var qs: int;
		
		//-- MELODY SHORT AND SAMPLE POSITION
		private var msh: int;
		private var ms: int;
		
		//-- MASTER MIXER
		private var run: Boolean;
		private var vol: Number;

public function SS()
		{
			bd.writeUTFBytes("'.3.'.3.'.3.'.3.'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6,383,383(/4/(/4/#*/6#*/6'.3.'.3.'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6'.3.'.3.#*/6#*/6'.3.'.3.")
			md.writeUTFBytes("`?=;@?DBFDFG\nDGPNKBDKIF;?=;@?FDXWZh\nfdc\n_S ca_dc$cZ\\_\\ZWZW_^WZ^_\nac\\_acZX\nZ\\XWSWXZ\n\\_hfcZ\\cacWWUSXW\\Z^\\\\^_\\_hfc_^ZWZ^_ZWZ_^ZW^ZWZ^_ZWSSUWS\\ZWWXZW^Zchfdcac_\\ch\nfdc\n_S ca_dc$cZ\\_\\ZWZW_^WZ^_\nac\\_acZX\nZ\\XWSWXZ\n\\_hfcZ\\cacWWUSXW\\Z^\\\\^_\\_hfc_^ZWZ^_ZWZ_^ZW^ZWZ^_ZWSSUWS\\ZWWXZW^Zchfdcac_\\c");
			md.position = 0;
			
			graphics.beginFill( 0x4040e0 );
			graphics.drawRect( 44, 42, 320, 200 );
			
			//-- FIRST MELO NOTE
			msh = md.readShort();
			ms = int( ( ( ( msh >> 8 & 0xFF ) * .125 ) * 10584000 ) / 170 );
			
			//-- PANNING
			sr[4] = .25;
			sr[10] = -.25;
			
			run = true;
			vol = .2;
			
			var snd:* = new Sound();
			snd.addEventListener( 'sampleData', sd );
			snd.play();
		}

private function sd( e:* ): void
		{
			var amp: Number;
			var ml: Number;
			var mr: Number;
			var pl: Number;
			var vi: int;
			var vn: int;
			
			for( var i: int = 0 ; i < 4096 ; ++i )
			{
				if( --qs < 0 ) //-- NEXT QUARTER NOTE
				{
					//-- SET REGISTER
					vn = (qi&1) * 6;
					
					// PitchPhase
					sr[int(vn+0)] = 0;
					
					// PitchPhaseIncr
					sr[int(vn+1)] = 440 * Math.pow( 2, ( bd[ qi ] - 69 ) / 12 ) / 44100;
					
					// Volume
					sr[int(vn+3)] = .25;
					
					// QUATER NOTE IN SAMPLES (170BPM)
					qs = int( ( .25 * 10584000 ) / 170 );
					++qi;
				}
				
				if( md.bytesAvailable >= 2 ) // MELODY DATA AVAIABLE
				{
					if( --ms < 0 )  // NEXT MELODY NOTE
					{
						// PitchPhase
						sr[12] = 0;

// PitchPhaseIncr
						sr[13] = 440 * Math.pow( 2, ( ( msh & 0xFF ) - 69 ) / 12 ) / 44100;
						
						// Volume
						sr[15] = .175;
						
						//-- COMPUTE SAMPLE OFFSET TO NEXT NOTE
						msh = md.readShort();
						ms = int( ( ( ( msh >> 8 & 0xFF ) * .125 ) * 10584000 ) / 170 );
					}
				}
				else
					run = false;
				
				//-- MASTER VOLUME
				run ? vol += ( 1 - vol ) * .000003 : vol -= vol * .000003;
				
				//-- MIX UP THE 3 CHANNELS
				ml = 0;
				mr = 0;
				
				for( vi = 0 ; vi < 3 ; ++vi )
				{
					vn = vi * 6;
					
					//-- PULSE
					if( ( pl = sr[int(vn+2)] * 2 ) > 1 ) pl = 2 - pl;
					
					//-- WAVEFORM (SQUARE WITH PULSE-MODULATION)
					amp = sr[vn] < ( .2 + pl * .3 ) ? vol : -vol;
					
					//-- VOLUME DECAY ENVELOPE
					amp *= sr[int(vn+3)] *= .99996;
					
					//-- LOWPASS FILTER TO AVOID ANTIALIASING
					sr[int(vn+5)] += ( amp - sr[int(vn+5)] ) * .3;
					
					//-- VOICE MIX
					ml += ( 1 - sr[int(vn+4)] ) * sr[int(vn+5)];
					mr += ( sr[int(vn+4)] + 1 ) * sr[int(vn+5)];

//-- PULSE INCR
					if( ( sr[int(vn+2)] += .000033 ) >= 1 )
						--sr[int(vn+2)];

//-- PITCH INCR
					if( ( sr[vn] += sr[int(vn+1)] ) >= 1 )
						--sr[vn];
				}

//-- WRITE OUTPUT STREAM
				e.data.writeFloat( ml );
				e.data.writeFloat( mr );
			}
			
			if( vol < .001 )
				e.target.removeEventListener( 'sampleData', sd );
		}
	}
}

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