matthiasm@8: %
matthiasm@8: %CHORD2MIDINOTES Generate MIDI note values for a given chord symbol
matthiasm@8: % 
matthiasm@8: % [midinotes, success, errormessage] = chord2midinotes(chordsymbol, {verbose})
matthiasm@8: % 
matthiasm@8: % Obtains a set of midi note values for notes present in chord "chordsymbol".
matthiasm@8: % The voicing is built on the rootnote with all other degrees occuring 
matthiasm@8: % above in number order unless a bass degree is specified.
matthiasm@8: %
matthiasm@8: % In the case of the 'no chord' symbol 'N' function returns midinote -1
matthiasm@8: %
matthiasm@8: % Success = 1 if chord is converted correctly else 0.
matthiasm@8: % 
matthiasm@8: % If optional argument 'verbose' is 1, function prints any errormessage to 
matthiasm@8: % the screen.
matthiasm@8: %
matthiasm@8: % Returns:  midinotes (array of integers)
matthiasm@8: %           success (boolean)
matthiasm@8: %           errormessage (string)
matthiasm@8: %
matthiasm@8: %
matthiasm@8: % % Author: Christopher Harte,  August 2005
matthiasm@8: % 
matthiasm@8: % Copyright: Centre for Digital Music, Queen Mary University of London 2005 
matthiasm@8: %
matthiasm@8: % This file is part of the C4DM Chord Toolkit.  
matthiasm@8: %
matthiasm@8: % The C4DM Chord Toolkit is free software; you can redistribute it and/or 
matthiasm@8: % modify it under the terms of the GNU General Public License as published 
matthiasm@8: % by the Free Software Foundation; either version 2 of the License, or
matthiasm@8: % (at your option) any later version.
matthiasm@8: %
matthiasm@8: % The C4DM Chord Toolkit is distributed in the hope that it will be useful,
matthiasm@8: % but WITHOUT ANY WARRANTY; without even the implied warranty of
matthiasm@8: % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
matthiasm@8: % GNU General Public License for more details.
matthiasm@8: %
matthiasm@8: % You should have received a copy of the GNU General Public License
matthiasm@8: % along with the C4DM Toolkit; if not, write to the Free Software
matthiasm@8: % Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
matthiasm@8: 
matthiasm@8: %
matthiasm@8: function [midinotes, success,errormessage] = chord2midinotes(chordsymbol, verbose)
matthiasm@8: 
matthiasm@8: % set verbose default to 0
matthiasm@8: if nargin < 2
matthiasm@8:     verbose = 0;
matthiasm@8: end
matthiasm@8: 
matthiasm@8: errormessage = '';
matthiasm@8: mainlist = '';
matthiasm@8: success = 1;
matthiasm@8: midinotes = 0;
matthiasm@8: 
matthiasm@8: % parse the chordsymbol
matthiasm@8: [rootnote,shorthand,degreelist,bass, success, errormessage] = getchordinfo(chordsymbol);
matthiasm@8: 
matthiasm@8: if success
matthiasm@8: 
matthiasm@8: 
matthiasm@8:     %if 'no chord' then return -1
matthiasm@8:     if rootnote == 'N'
matthiasm@8: 
matthiasm@8:         midinotes = -1;
matthiasm@8:     else
matthiasm@8: 
matthiasm@8:         % get root's pitchclass with respect to middle C and calculate absolute
matthiasm@8:         % pitch of root in that octave   
matthiasm@8:         if success
matthiasm@8: 
matthiasm@8:         [rootpitchclass, success, errormessage] = note2pitchclass(rootnote);
matthiasm@8: 
matthiasm@8:         % midinote C4 = 60 so add pitchclass to calculate rootpitch
matthiasm@8:         rootpitch = 60 + rootpitchclass;
matthiasm@8: 
matthiasm@8:         end
matthiasm@8: 
matthiasm@8: 
matthiasm@8:         % combine shorthand and degreelist and obtain semitone values for each
matthiasm@8:         % degree
matthiasm@8:         if success
matthiasm@8: 
matthiasm@8:             [mainlist, success, errormessage] = addshort2list(shorthand, degreelist);
matthiasm@8: 
matthiasm@8:             if success
matthiasm@8: 
matthiasm@8:                 [semitones,success,errormessage] = degrees2semitones(mainlist);
matthiasm@8: 
matthiasm@8:                 % add rootpitch to obtain midinotes
matthiasm@8:                 chordpitches = semitones + rootpitch;
matthiasm@8: 
matthiasm@8:             end
matthiasm@8: 
matthiasm@8:         end
matthiasm@8: 
matthiasm@8:         % Now find the bass note
matthiasm@8: 
matthiasm@8:         if success
matthiasm@8: 
matthiasm@8:             % if we haven't got a bass degree then play the rootnote as the
matthiasm@8:             % bassnote
matthiasm@8:             if isempty(bass)
matthiasm@8:                 basspitchclass = rootpitchclass;
matthiasm@8:             else
matthiasm@8:                 % otherwise convert the bassdegree to a note
matthiasm@8:                 [bassnote,success,errormessage] = degree2note(bass, rootnote);
matthiasm@8: 
matthiasm@8:                 if success
matthiasm@8: 
matthiasm@8:                     [basspitchclass, success, errormessage] = note2pitchclass(char(bassnote));
matthiasm@8: 
matthiasm@8:                 end
matthiasm@8:             end
matthiasm@8: 
matthiasm@8:             if success
matthiasm@8:                 % calculate bass note so that it is in the octave below the
matthiasm@8:                 % rest of the chord i.e. add to C3 midinote 48
matthiasm@8:                 basspitch = basspitchclass + 48;
matthiasm@8: 
matthiasm@8:                 % Put midinote list together
matthiasm@8:                 midinotes = [basspitch, rootpitch];
matthiasm@8:                 
matthiasm@8:                 for index = 1:length(chordpitches)
matthiasm@8:                     if chordpitches(index) ~= rootpitch
matthiasm@8:                        midinotes = [midinotes, chordpitches(index)];
matthiasm@8:                     end
matthiasm@8:                 end
matthiasm@8:             end
matthiasm@8: 
matthiasm@8:         end
matthiasm@8:     end
matthiasm@8: 
matthiasm@8: %alter pitches for chords with high roots
matthiasm@8: if rootpitchclass > 6
matthiasm@8:     midinotes = midinotes-12;
matthiasm@8: end
matthiasm@8: 
matthiasm@8: end
matthiasm@8:     
matthiasm@8: if success == 0
matthiasm@8:     errormessage = [errormessage sprintf(['Error in chord2midinotes: Couldn''t convert chord"' chordsymbol '"\n'])];   
matthiasm@8:     if verbose ==1
matthiasm@8:        fprintf(1,errormessage);
matthiasm@8:     end
matthiasm@8: end  
matthiasm@8:     
matthiasm@8:     
matthiasm@8: