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function f=comp_iwfbt(c,wtNodes,outLens,rangeLoc,rangeOut,ext)
%-*- texinfo -*-
%@deftypefn {Function} comp_iwfbt
%@verbatim
%COMP_IWFBT Compute Inverse Wavelet Filter-Bank Tree
% Usage: f=comp_iwfbt(c,wtNodes,outLens,rangeLoc,rangeOut,ext)
%
% Input parameters:
% c : Coefficients stored in the cell array.
% wtNodes : Filterbank tree nodes (elementary filterbanks) in
% reverse BF order. Length nodeNo cell array of structures.
% outLens : Output lengths of each node. Length nodeNo array.
% rangeLoc : Idxs of each node inputs. Length nodeNo
% cell array of vectors.
% rangeOut : Input subband idxs of each node inputs.
% ext : Type of the forward transform boundary handling.
%
% Output parameters:
% f : Reconstructed outLens(end)*W array.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_iwfbt.html}
%@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/>.
% Do non-expansve transform if ext='per'
doPer = strcmp(ext,'per');
ca = {};
% Go over all nodes in breadth-first order
for jj=1:length(wtNodes)
% Node filters to a cell array
% gCell = cellfun(@(gEl) conj(flipud(gEl.h(:))),wtNodes{jj}.g(:),'UniformOutput',0);
gCell = cellfun(@(gEl) gEl.h(:),wtNodes{jj}.g(:),'UniformOutput',0);
% Node filters subs. factors
a = wtNodes{jj}.a;
% Node filters initial skips
if(doPer)
% offset = cellfun(@(gEl) 1-numel(gEl.h)-gEl.offset,wtNodes{jj}.g(:));
offset = cellfun(@(gEl) gEl.offset,wtNodes{jj}.g(:));
else
offset = -(a-1);
end
filtNo = numel(gCell);
% Prepare input cell-array
catmp = cell(filtNo,1);
% Read data from subbands
catmp(rangeLoc{jj}) = c(rangeOut{jj});
diffRange = 1:filtNo;
diffRange(rangeLoc{jj}) = [];
% Read data from intermediate outputs (filters are taken in reverse order)
catmp(diffRange(end:-1:1)) = ca(1:numel(diffRange));
%Run filterbank
catmp = comp_ifilterbank_td(catmp,gCell,a,outLens(jj),offset,ext);
%Save intermediate output
ca = [ca(numel(diffRange)+1:end);catmp];
end
f = catmp;
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