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beatsyncattackslope.m
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beatsyncattackslope.m
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function [at,as,bsas] = beatsyncattackslope(data, sr, bts)
% function [at,as,bsas] = beatsyncattackslope(data, sr, bts)
%
% Calculate the beat-synchronous attack-slope of the waveform data using
% the beat times (bts) in seconds and the sampling rate (sr). The
% attack slope features are calculated using the MIRtoolbox
% 'mirattackslope' algorithms. See
% http://www.jyu.fi/hum/laitokset/musiikki/en/research/coe/materials/mirtoolbox/mirtoolbox
% for more information.
%
% Parameters:
% data the audio waveform data
% sr the sampling rate
% bts the beat times (in seconds)
%
% Output:
% at the attack times
% as the attack slope values
% bsas the beat-synchronous attack slope values (the attack
% slopes closest to the beat times)
%
% License:
% UCCS MIR Key Detection
% Copyright (C) 2012 Devon Bryant
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU Affero 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 Affero General Public License for more details.
%
% You should have received a copy of the GNU Affero General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
a = miraudio(data,sr);
miras = mirattackslope(a);
as = mirgetdata(miras);
at_cell = get(miras, 'FramePos');
at = mean(at_cell{1}{1});
bsas = bts_align(bts,num2cell(at),num2cell(as));
for i=1:length(bsas)
if isempty(bsas{i})
bsas{i} = 0;
end
end
% Convert back to array
bsas = cell2mat(bsas);
end