f = gspi;
a = 128;
M = 2048;
M2 = floor(M/2) + 1; 
gl = 2048;
L = dgtlength(numel(f),a,M);
g = firwin('hann',gl);
gamma = 0.25645*gl^2;
gd = long2fir(gabdual(g,a,M),gl);
N = L/a;
lookahead = 7;
maxit = 1;

corig = dgtreal(f,{'hann',gl},a,M,'timeinv');
s = abs(corig);

cout = zeros(2*M2,N);
coutPtr = libpointer('doublePtr',cout);

coutsingle = zeros(2*M2,N,'single');
coutsinglePtr = libpointer('singlePtr',coutsingle);

tic
calllib('libphaseret','phaseret_gsrtisilapghioffline_d',s,g,L,gl,0,a,M,lookahead,maxit,...
                      gamma, 1e-6, 0, coutPtr);
toc
                  
coutsingle = zeros(2*M2,N,'single');
coutsinglePtr = libpointer('singlePtr',coutsingle);
ssingle = cast(s,'single');

tic
calllib('libphaseret','phaseret_gsrtisilapghioffline_s',ssingle,cast(g,'single'),L,gl,1,a,M,lookahead,maxit,...
                      gamma, 1e-6, 0, coutsinglePtr);
toc

coutsingle2 = interleaved2complex(coutsinglePtr.Value);
cout2 = interleaved2complex(coutPtr.Value);

frec = idgtreal(coutsingle2,{'dual',{'hann',gl}},a,M,'timeinv');

s2 = abs(dgtreal(frec,{'hann',gl},a,M,'timeinv'));
magnitudeerrdb(s,s2)



c=gsrtisila(s,g,a,M,'lookahead',lookahead,'maxit',maxit,'timeinv','rtpghi',{gamma});

frec = idgtreal(c,{'dual',{'hann',gl}},a,M,'timeinv');
s3 = abs(dgtreal(frec,{'hann',gl},a,M,'timeinv'));
magnitudeerrdb(s,s3)



%-*- texinfo -*-
%@deftypefn {Function} test_libphaseret_gsrtisilapghi
%@verbatim
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/libltfat/modules/libphaseret/testing/mUnit/test_libphaseret_gsrtisilapghi.html}
%@end deftypefn

% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.0
%
% 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 3 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, see <http://www.gnu.org/licenses/>.

