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function [Lc,L]=wfbtclength(Ls,wt,varargin)
%-*- texinfo -*-
%@deftypefn {Function} wfbtclength
%@verbatim
%WFBTCLENGTH WFBT subband lengths from a signal length
% Usage: Lc=wfbtclength(Ls,wt);
% [Lc,L]=wfbtclength(...);
%
% Lc=WFBTCLENGTH(Ls,wt) returns the lengths of coefficient subbands
% obtained from WFBT for a signal of length Ls. Please see the help
% on WFBT for an explanation of the parameters wt.
%
% [Lc,L]=WFBTCLENGTH(...) additionally returns the next legal length
% of the input signal for the given extension type.
%
% The function support the same boundary-handling flags as the FWT
% does.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/wavelets/wfbtclength.html}
%@seealso{wfbt, wfbtlength}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% 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/>.
% AUTHOR: Zdenek Prusa
complainif_notposint(Ls,'Ls','WFBTCLENGTH');
definput.import = {'fwt'};
[flags,kv]=ltfatarghelper({},definput,varargin);
% Initialize the wavelet filters structure
wt = wfbtinit(wt);
if(flags.do_per)
a = treeSub(wt);
L = filterbanklength(Ls,a);
Lc = L./a;
else
L = Ls;
Lc = treeOutLen(L,0,wt);
end
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