function [DAT,H1]=openbdf(FILENAME)% EDF=openedf(FILENAME)% Opens an EDF File (European Data Format for Biosignals) in MATLAB (R)% <A HREF="http://www.medfac.leidenuniv.nl/neurology/knf/kemp/edf.htm">About EDF</A> %	Copyright (C) 1997-1998 by Alois Schloegl%	a.schloegl@ieee.org%	Ver 2.20 	18.Aug.1998%	Ver 2.21 	10.Oct.1998%	Ver 2.30 	 5.Nov.1998%%	For use under Octave define the following function% function s=upper(s); s=toupper(s); end;% V2.12    Warning for missing Header information  
% V2.20    EDF.AS.* changed
% V2.30    EDF.T0 made Y2K compatible until Year 2090

% 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 2% 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 for more details.% % You should have received a copy of the GNU General Public License% along with this program; if not, write to the Free Software% Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.% Name changed Sept 6,2002  T.S. LorigSLASH='/';		% defines Seperator for SubdirectoriesBSLASH=setstr(92);cname=computer;if cname(1:2)=='PC' SLASH=BSLASH; end;fid=fopen(FILENAME,'r','ieee-le');          if fid<0 	fprintf(2,['Error LOADEDF: File ' FILENAME ' not found\n']);  	return;end;EDF.FILE.FID=fid;EDF.FILE.OPEN = 1;EDF.FileName = FILENAME;PPos=min([max(find(FILENAME=='.')) length(FILENAME)+1]);SPos=max([0 find((FILENAME=='/') | (FILENAME==BSLASH))]);EDF.FILE.Ext = FILENAME(PPos+1:length(FILENAME));EDF.FILE.Name = FILENAME(SPos+1:PPos-1);if SPos==0	EDF.FILE.Path = pwd;else	EDF.FILE.Path = FILENAME(1:SPos-1);end;EDF.FileName = [EDF.FILE.Path SLASH EDF.FILE.Name '.' EDF.FILE.Ext];H1=setstr(fread(EDF.FILE.FID,256,'char')');     %EDF.VERSION=H1(1:8);                     % 8 Byte  Versionsnummer %if 0 fprintf(2,'LOADEDF: WARNING  Version EDF Format %i',ver); end;EDF.PID = deblank(H1(9:88));                  % 80 Byte local patient identificationEDF.RID = deblank(H1(89:168));                % 80 Byte local recording identification%EDF.H.StartDate = H1(169:176);         % 8 Byte		%EDF.H.StartTime = H1(177:184);         % 8 Byte		EDF.T0=[str2num(H1(168+[7 8])) str2num(H1(168+[4 5])) str2num(H1(168+[1 2])) str2num(H1(168+[9 10])) str2num(H1(168+[12 13])) str2num(H1(168+[15 16])) ];
% Y2K compatibility until year 2090
if EDF.VERSION(1)=='0'
        if EDF.T0(1) < 91
                EDF.T0(1)=2000+EDF.T0(1);
        else
                EDF.T0(1)=1900+EDF.T0(1);
        end;
else ;
        % in a future version, this is hopefully not needed   
end;
EDF.HeadLen = str2num(H1(185:192));  % 8 Byte  Length of Header% reserved = H1(193:236);	         % 44 Byte		EDF.NRec = str2num(H1(237:244));     % 8 Byte  # of data recordsEDF.Dur = str2num(H1(245:252));      % 8 Byte  # duration of data record in secEDF.NS = str2num(H1(253:256));       % 8 Byte  # of signalsEDF.Label = setstr(fread(EDF.FILE.FID,[16,EDF.NS],'char')');		EDF.Transducer = setstr(fread(EDF.FILE.FID,[80,EDF.NS],'char')');	EDF.PhysDim = setstr(fread(EDF.FILE.FID,[8,EDF.NS],'char')');	EDF.PhysMin= str2num(setstr(fread(EDF.FILE.FID,[8,EDF.NS],'char')'));	EDF.PhysMax= str2num(setstr(fread(EDF.FILE.FID,[8,EDF.NS],'char')'));	EDF.DigMin = str2num(setstr(fread(EDF.FILE.FID,[8,EDF.NS],'char')'));	%	EDF.DigMax = str2num(setstr(fread(EDF.FILE.FID,[8,EDF.NS],'char')'));	%	% check validity of DigMin and DigMaxif (length(EDF.DigMin) ~= EDF.NS)        fprintf(2,'Warning OPENEDF: Failing Digital Minimum\n');        EDF.DigMin = -(2^15)*ones(EDF.NS,1);endif (length(EDF.DigMax) ~= EDF.NS)        fprintf(2,'Warning OPENEDF: Failing Digital Maximum\n');        EDF.DigMax = (2^15-1)*ones(EDF.NS,1);endif (any(EDF.DigMin >= EDF.DigMax))        fprintf(2,'Warning OPENEDF: Digital Minimum larger than Maximum\n');end  % check validity of PhysMin and PhysMaxif (length(EDF.PhysMin) ~= EDF.NS)        fprintf(2,'Warning OPENEDF: Failing Physical Minimum\n');        EDF.PhysMin = EDF.DigMin;endif (length(EDF.PhysMax) ~= EDF.NS)        fprintf(2,'Warning OPENEDF: Failing Physical Maximum\n');        EDF.PhysMax = EDF.DigMax;endif (any(EDF.PhysMin >= EDF.PhysMax))        fprintf(2,'Warning OPENEDF: Physical Minimum larger than Maximum\n');        EDF.PhysMin = EDF.DigMin;        EDF.PhysMax = EDF.DigMax;end  EDF.PreFilt= setstr(fread(EDF.FILE.FID,[80,EDF.NS],'char')');	%	tmp = fread(EDF.FILE.FID,[8,EDF.NS],'char')';	%	samples per data recordEDF.SPR = str2num(setstr(tmp));	%	samples per data recordfseek(EDF.FILE.FID,32*EDF.NS,0);EDF.Cal = (EDF.PhysMax-EDF.PhysMin)./ ...    (EDF.DigMax-EDF.DigMin);EDF.Off = EDF.PhysMin - EDF.Cal .* EDF.DigMin;tmp = find(EDF.Cal < 0);EDF.Cal(tmp) = ones(size(tmp));EDF.Off(tmp) = zeros(size(tmp));EDF.Calib=[EDF.Off';(diag(EDF.Cal))];%EDF.Calib=sparse(diag([1; EDF.Cal]));%EDF.Calib(1,2:EDF.NS+1)=EDF.Off';EDF.SampleRate = EDF.SPR / EDF.Dur;EDF.FILE.POS = ftell(EDF.FILE.FID);if EDF.NRec == -1   % unknown record size, determine correct NRec  fseek(EDF.FILE.FID, 0, 'eof');  endpos = ftell(EDF.FILE.FID);  EDF.NRec = floor((endpos - EDF.FILE.POS) / (sum(EDF.SPR) * 2));  fseek(EDF.FILE.FID, EDF.FILE.POS, 'bof');  H1(237:244)=sprintf('%-8i',EDF.NRec);      % write number of records
end; EDF.Chan_Select=(EDF.SPR==max(EDF.SPR));for k=1:EDF.NS	if EDF.Chan_Select(k)	    EDF.ChanTyp(k)='N';	else	    EDF.ChanTyp(k)=' ';	end;         	if findstr(upper(EDF.Label(k,:)),'ECG')	    EDF.ChanTyp(k)='C';	elseif findstr(upper(EDF.Label(k,:)),'EKG')	    EDF.ChanTyp(k)='C';	elseif findstr(upper(EDF.Label(k,:)),'EEG')	    EDF.ChanTyp(k)='E';	elseif findstr(upper(EDF.Label(k,:)),'EOG')	    EDF.ChanTyp(k)='O';	elseif findstr(upper(EDF.Label(k,:)),'EMG')	    EDF.ChanTyp(k)='M';	end;end;EDF.AS.spb = sum(EDF.SPR);	% Samples per Blockbi=[0;cumsum(EDF.SPR)]; 

idx=[];idx2=[];for k=1:EDF.NS, 	idx2=[idx2, (k-1)*max(EDF.SPR)+(1:EDF.SPR(k))];end;
maxspr=max(EDF.SPR);idx3=zeros(EDF.NS*maxspr,1);
for k=1:EDF.NS, idx3(maxspr*(k-1)+(1:maxspr))=bi(k)+ceil((1:maxspr)'/maxspr*EDF.SPR(k));end;

%EDF.AS.bi=bi;
EDF.AS.IDX2=idx2;%EDF.AS.IDX3=idx3;
DAT.Head=EDF;  DAT.MX.ReRef=1;%DAT.MX=feval('loadxcm',EDF);return;