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function demo_blockproc_slidingsgram(source,varargin)
%-*- texinfo -*-
%@deftypefn {Function} demo_blockproc_slidingsgram
%@verbatim
%DEMO_BLOCKPROC_SLIDINGSGRAM Basic real-time rolling spectrogram visualization
% Usage: demo_blockproc_slidingsgram('gspi.wav')
%
% For additional help call DEMO_BLOCKPROC_SLIDINGSGRAM without arguments.
%
% This demo shows a simple rolling spectrogram of whatever is specified in
% source.
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/demos/demo_blockproc_slidingsgram.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/>.
if demo_blockproc_header(mfilename,nargin)
return;
end
% Basic Control pannel (Java object)
p = blockpanel({
{'GdB','Gain',-20,20,0,21},...
});
% Basic sepctrogram figure (Java object)
fobj = blockfigure();
% Setup blockstream
try
fs=block(source,varargin{:},'loadind',p);
catch
% Close the windows if initialization fails
blockdone(p,fobj);
err = lasterror;
error(err.message);
end
% 30 ms
bufLen = floor(30e-3*fs);
% Using dgtreal with 20ms hann window, hop factor 80, 1000 channels.
% Redundancy factor 12.5
winLenms = 40;
a = 100;
M = 3000;
F = frame('dgtreal',{'hann',floor(fs*winLenms/1e3)},a,M);
F = blockframeaccel(F, bufLen,'segola');
flag = 1;
%Loop until end of the stream (flag) and until panel is opened
while flag && p.flag
% Obtain the global gain value
gain = blockpanelget(p,'GdB');
gain = 10^(gain/20);
% Read the next block of samples
[f,flag] = blockread(bufLen);
f=f*gain;
% Do analysis using the specified frame.
c = blockana(F, f);
% Draw the first channel coefficients
blockplot(fobj,F,c(:,1));
% Enqueue to play
blockplay(f);
end
blockdone(p,fobj);
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