tune/eq/eq_coef_quant.m

function qc = eq_coef_quant(c, bits, qf)

%%
% Copyright (c) 2016, Intel Corporation
% All rights reserved.
%
% Redistribution and use in source and binary forms, with or without
% modification, are permitted provided that the following conditions are met:
%   * Redistributions of source code must retain the above copyright
%     notice, this list of conditions and the following disclaimer.
%   * Redistributions in binary form must reproduce the above copyright
%     notice, this list of conditions and the following disclaimer in the
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%   * Neither the name of the Intel Corporation nor the
%     names of its contributors may be used to endorse or promote products
%     derived from this software without specific prior written permission.
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% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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%
% Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
%

scale = 2^qf;
cmax =  2^(bits-1)-1;
cmin = -2^(bits-1);
qc = int64(round(c*scale));
idx = find(qc > cmax);
if ~isempty(idx)
        fprintf('Warning: Max. value of Q format is exceeded: %d (%d)\n', ...
                qc(idx(1)), cmax);
        qc(idx) = cmax;
end
idx = find(qc < cmin);
if ~isempty(idx)
        fprintf('Warning: Min. value of Q format is exceeded: %d (%d)\n', ...
                qc(idx(1)), cmin);
        qc(idx) = cmin;
end

end