/*******************************************************************************
*  Copyright 2007 - 2011, Philip S. Considine                                  *
*  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, either version 3 of the License, or           *
*  (at your option) any later version.                                         *
*                                                                              *
*  This program is distributed in the hope that it will be useful,             *
*  but WITHOUT ANY WARRANTY; without even the implied warranty of              *
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                *
*  GNU General Public License (http://www.gnu.org/licenses/)for more details.  *
*******************************************************************************/

desc: MIDI Router with transpose

slider1:0<0,15,1{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}>Input Channel
slider2:0<0,15,1{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}>Output Channel
slider3:3<0,3,1{Off, Notes, Non-Notes, Both}>Mode
slider4:0<0,127,1>Note Min
slider5:127<0,127,1>Note Max

// Note min/max (names) (disabled)
//slider4:0<0,127,1{C0,C#0,D0,D#0,E0,F0,F#0,G0,G#0,A0,A#0,B0,C1,C#1,D1,D#1,E1,F1,F#1,G1,G#1,A1,A#1,B1,C2,C#2,D2,D#2,E2,F2,F#2,G2,G#2,A2,A#2,B2,C3,C#3,D3,D#3,E3,F3,F#3,G3,G#3,A3,A#3,B3,C4,C#4,D4,D#4,E4,F4,F#4,G4,G#4,A4,A#4,B4,C5,C#5,D5,D#5,E5,F5,F#5,G5,G#5,A5,A#5,B5,C6,C#6,D6,D#6,E6,F6,F#6,G6,G#6,A6,A#6,B6,C7,C#7,D7,D#7,E7,F7,F#7,G7,G#7,A7,A#7,B7,C8,C#8,D8,D#8,E8,F8,F#8,G8,G#8,A8,A#8,B8,C9,C#9,D9,D#9,E9,F9,F#9,G9,G#9,A9,A#9,B9,C10,C#10,D10,D#10,E10,F10,F#10,G10}>Note Min
//slider5:127<0,127,1{C0,C#0,D0,D#0,E0,F0,F#0,G0,G#0,A0,A#0,B0,C1,C#1,D1,D#1,E1,F1,F#1,G1,G#1,A1,A#1,B1,C2,C#2,D2,D#2,E2,F2,F#2,G2,G#2,A2,A#2,B2,C3,C#3,D3,D#3,E3,F3,F#3,G3,G#3,A3,A#3,B3,C4,C#4,D4,D#4,E4,F4,F#4,G4,G#4,A4,A#4,B4,C5,C#5,D5,D#5,E5,F5,F#5,G5,G#5,A5,A#5,B5,C6,C#6,D6,D#6,E6,F6,F#6,G6,G#6,A6,A#6,B6,C7,C#7,D7,D#7,E7,F7,F#7,G7,G#7,A7,A#7,B7,C8,C#8,D8,D#8,E8,F8,F#8,G8,G#8,A8,A#8,B8,C9,C#9,D9,D#9,E9,F9,F#9,G9,G#9,A9,A#9,B9,C10,C#10,D10,D#10,E10,F10,F#10,G10}>Note Max

slider6:0<-60,60,1>Transpose

////////////////////////////////////////////////////////////////////////////////
@init
statNoteOn = $x90;
statNoteOff = $x80;

////////////////////////////////////////////////////////////////////////////////
@slider

slider4 = min(max(slider4 | 0, 0), 127);	// Remove fractions and clamp to legal range
slider5 = min(max(slider5 | 0, 0), 127);
slider6 = min(max(slider6 | 0, -60), 60);

inChannel = slider1;
outChannel = slider2;
mode = slider3;
noteMin = slider4;
noteMax = slider5;
transpose = slider6;

////////////////////////////////////////////////////////////////////////////////
@block
while
(
	midirecv(offset, msg1, msg23) ?
	(	
		// Extract message type and channel
		status = msg1 & $xF0;
		channel = msg1 & $x0F;
			
		// Is it on our channel?
		channel == inChannel ? 
		(
			// Note events are always redirected
			(status == statNoteOn || status == statNoteOff) ?
			(
				// Extract note value
				note = msg23 & $x7F;
					
				// Is it within our note range?
				mode & 1 ?
				(
					note >= noteMin && note <= noteMax ?
					(	
						// Transpose and clamp
						note += transpose;
						note < 0 ? note = 0; note > 127 ? note = 127;

						// Modify MIDI message data
						msg1 = status + outChannel;
						msg23 = (msg23 & $xFF00) | note;
					);
				);
			)
			: mode & 2 ? // Redired non-note events if necessary
			(
				msg1 = status + outChannel;
			);
		);
		
		// Pass message on
		midisend(offset, msg1, msg23);
		
		1; // Force loop to continue until all messages have been processed
	);
);
