christopherh@1: %
christopherh@1: %NOTE2PITCHCLASS convert a note to a pitchclass value w.r.t middle C
christopherh@1: % 
christopherh@1: % [pitchclass, success, errormessage] = note2pitchclass(note, {verbose})
christopherh@1: % 
christopherh@1: % Converts a note string to a pitch class (integer) with C as reference 
christopherh@1: % pitch class 0
christopherh@1: % 
christopherh@1: % Success = 1 if symbols parsed correctly, 0 otherwise.
christopherh@1: %
christopherh@1: % If optional argument 'verbose' is 1, function prints any errormessage to 
christopherh@1: % the screen.
christopherh@1: % 
christopherh@1: % returns:  pitchclass (integer)
christopherh@1: %           success (boolean)
christopherh@1: %           errormessage (string)
christopherh@1: %
christopherh@1: %
christopherh@1: % Author: Christopher Harte, March 2009
christopherh@1: % 
christopherh@1: % Copyright: Centre for Digital Music, Queen Mary University of London 2005 
christopherh@1: %
christopherh@1: % This file is part of the C4DM Chord Toolkit V2.0  
christopherh@1: %
christopherh@1: % The C4DM Chord Toolkit is free software; you can redistribute it and/or 
christopherh@1: % modify it under the terms of the GNU General Public License as published 
christopherh@1: % by the Free Software Foundation; either version 2 of the License, or
christopherh@1: % (at your option) any later version.
christopherh@1: %
christopherh@1: % The C4DM Chord Toolkit is distributed in the hope that it will be useful,
christopherh@1: % but WITHOUT ANY WARRANTY; without even the implied warranty of
christopherh@1: % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
christopherh@1: % GNU General Public License for more details.
christopherh@1: %
christopherh@1: % You should have received a copy of the GNU General Public License
christopherh@1: % along with the C4DM Toolkit; if not, write to the Free Software
christopherh@1: % Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
christopherh@1: 
christopherh@1: %
christopherh@1: function [pitchclass, success, errormessage] = note2pitchclass(note, verbose)
christopherh@1: 
christopherh@1: if nargin < 2
christopherh@1:     verbose = 0;
christopherh@1: end
christopherh@1: 
christopherh@1: errormessage = '';
christopherh@1: 
christopherh@1: ilength = length(note);
christopherh@1: 
christopherh@1: index = 1;
christopherh@1: success = 1;
christopherh@1: 
christopherh@1: 
christopherh@1: % first char should be a natural name A-G
christopherh@1: switch note(index)
christopherh@1: 
christopherh@1:     case 'C' % natural C
christopherh@1:             pitchclass = 0; 
christopherh@1:             index = index + 1;
christopherh@1: 
christopherh@1:     case 'D' % natural D
christopherh@1:             pitchclass = 2; 
christopherh@1:             index = index + 1;
christopherh@1:     
christopherh@1:     case 'E' % natural E
christopherh@1:             pitchclass = 4; 
christopherh@1:             index = index + 1;
christopherh@1:     
christopherh@1:     case 'F' % natural F
christopherh@1:             pitchclass = 5; 
christopherh@1:             index = index + 1;
christopherh@1:     
christopherh@1:     case 'G' % natural G
christopherh@1:             pitchclass = 7; 
christopherh@1:             index = index + 1;
christopherh@1:     
christopherh@1:     case 'A' % natural A
christopherh@1:             pitchclass = 9; 
christopherh@1:             index = index + 1;
christopherh@1:     
christopherh@1:     case 'B' % natural B
christopherh@1:             pitchclass = 11; 
christopherh@1:             index = index + 1;
christopherh@1:             
christopherh@1:     otherwise %Unrecognised character
christopherh@1:             errormessage = sprintf(['Error in Note2PitchClass: Unrecognised note "' note '"\n']);
christopherh@1:             index = ilength + 1;
christopherh@1:             pitchclass=-1;
christopherh@1:             success = 0;
christopherh@1:          
christopherh@1: end
christopherh@1: 
christopherh@1: % any other characters should be either flats or sharps
christopherh@1: while index <= ilength
christopherh@1:            
christopherh@1:     switch(note(index))
christopherh@1:         
christopherh@1:         case 'b' % FLAT
christopherh@1:             pitchclass = pitchclass - 1; %decrement pitchclass value
christopherh@1:             index = index + 1;
christopherh@1:             
christopherh@1:         case '#' % SHARP
christopherh@1:             pitchclass = pitchclass + 1; %increment pitchclass value
christopherh@1:             index = index + 1;
christopherh@1:         
christopherh@1:         otherwise % Unrecognised character
christopherh@1:             errormessage = sprintf(['Error in Note2PitchClass: Unrecognised note "' note '"\n']);
christopherh@1:             index = ilength + 1;
christopherh@1:             pitchclass=-1;
christopherh@1:             success = 0;
christopherh@1:     end        
christopherh@1:             
christopherh@1: end
christopherh@1: 
christopherh@1: % Use modulo command to make sure that we are back within range 0-12
christopherh@1: if(success == 1)
christopherh@1:     
christopherh@1:     pitchclass = mod(pitchclass,12);
christopherh@1:     
christopherh@1: else
christopherh@1:    if(verbose == 1)
christopherh@1:       fprintf(1,errormessage); 
christopherh@1:    end
christopherh@1: end
christopherh@1: 
christopherh@1: