Mauch MIREX 2010

%

%CHORD2FIFTHPOSITIONS Convert chord symbol to pitch positions on line of fifths

% 

% [fifthpostions, bass, success, errormessage] = chord2fifthpostions(chordsymbol, {verbose})

% 

% Converts a chord symbol to an array of integer positions on the line of fifths.

% C is the reference position 0.

%

% In the case of the 'no chord' symbol 'N' function returns an empty array

%

% Success = 1 if notes extracted from chordsymbol correctly, 0 otherwise.

% 

% If optional argument 'verbose' is 1, function prints any errormessage to 

% the screen.

% 

% calls:    chord2notes

%           notes2fifthpositions

% 

% returns:  fifthpostions (array of integers)           

%           success (boolean)

%           errormessage (string)

%

%

% Author: Christopher Harte,  August 2005

% 

% Copyright: Centre for Digital Music, Queen Mary University of London 2005 

%

% This file is part of the C4DM Chord Toolkit.  

%

% The C4DM Chord Toolkit 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 2 of the License, or

% (at your option) any later version.

%

% The C4DM Chord Toolkit 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 for more details.

%

% You should have received a copy of the GNU General Public License

% along with the C4DM Toolkit; if not, write to the Free Software

% Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

%             

function [fifthpostions, bass, success, errormessage] = chord2fifthpostions(chordsymbol, verbose)

% set verbose default to 0

if nargin < 2

    verbose = 0;

end

errormessage = '';

mainlist = '';

success = 1;

fifthpostions = [];

bass = '';

% get constituent notes

[chordnotes, bassnote, success, errormessage] = chord2notes(chordsymbol);

if success && ~isempty(chordnotes)

% find fifthpostions of notes

[fifthpostions, success, errormessage] = notes2fifthpositions(chordnotes);

end

if success && ~isempty(bassnote)

[bass, success, errormessage] = note2fifthposition(char(bassnote));

end

if success == 0

    errormessage = [errormessage sprintf(['Error in chord2fifthpostions: Couldn''t convert chord"' chordsymbol '"\n'])];   

    if verbose ==1

       fprintf(1,errormessage);

    end

end