comparison toolboxes/MIRtoolbox1.3.2/MIRToolbox/openbdf.m @ 0:e9a9cd732c1e tip

first hg version after svn

+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
+%	[e-mail]
+%	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. Lorig
+
+SLASH='/';		% defines Seperator for Subdirectories
+BSLASH=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']);  
+    % Warning desactivated in MIRtoolbox
+	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 identification
+EDF.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 records
+EDF.Dur = str2num(H1(245:252));      % 8 Byte  # duration of data record in sec
+EDF.NS = str2num(H1(253:256));       % 8 Byte  # of signals
+
+EDF.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 DigMax
+if (length(EDF.DigMin) ~= EDF.NS)
+        fprintf(2,'Warning OPENEDF: Failing Digital Minimum\n');
+        EDF.DigMin = -(2^15)*ones(EDF.NS,1);
+end
+if (length(EDF.DigMax) ~= EDF.NS)
+        fprintf(2,'Warning OPENEDF: Failing Digital Maximum\n');
+        EDF.DigMax = (2^15-1)*ones(EDF.NS,1);
+end
+if (any(EDF.DigMin >= EDF.DigMax))
+        fprintf(2,'Warning OPENEDF: Digital Minimum larger than Maximum\n');
+end  
+% check validity of PhysMin and PhysMax
+if (length(EDF.PhysMin) ~= EDF.NS)
+        fprintf(2,'Warning OPENEDF: Failing Physical Minimum\n');
+        EDF.PhysMin = EDF.DigMin;
+end
+if (length(EDF.PhysMax) ~= EDF.NS)
+        fprintf(2,'Warning OPENEDF: Failing Physical Maximum\n');
+        EDF.PhysMax = EDF.DigMax;
+end
+if (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 record
+EDF.SPR = str2num(setstr(tmp));	%	samples per data record
+
+fseek(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 Block
+bi=[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;