mirror of https://github.com/thesofproject/sof.git
72 lines
2.2 KiB
Matlab
72 lines
2.2 KiB
Matlab
function [l0, m0] = src_find_l0m0(L, M)
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% find_l0m0 - find l0, m0 to meet -l0*L + m0*M == 1
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%
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% [l0, m0] = find_l0m0(L, M)
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%
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% L - interpolatation factor
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% M - decimation factor
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%
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% Copyright (c) 2016, Intel Corporation
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% All rights reserved.
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%
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% Redistribution and use in source and binary forms, with or without
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% modification, are permitted provided that the following conditions are met:
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% * Redistributions of source code must retain the above copyright
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% notice, this list of conditions and the following disclaimer.
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% * Redistributions in binary form must reproduce the above copyright
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% notice, this list of conditions and the following disclaimer in the
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% documentation and/or other materials provided with the distribution.
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% * Neither the name of the Intel Corporation nor the
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% names of its contributors may be used to endorse or promote products
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% derived from this software without specific prior written permission.
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%
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% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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% POSSIBILITY OF SUCH DAMAGE.
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%
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% Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
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%
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if M == 1
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l0 = 0;
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m0 = 1;
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return
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end
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if L == 1
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l0 = 1;
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m0 = 0;
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return
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end
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l0 = [];
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m0 = [];
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for lt=1:4*L
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mt = (1+lt*L)/M; % Check if -lt*L + mt*M == 1
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if floor(mt) == mt
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l0 = [l0 lt];
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m0 = [m0 mt];
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end
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end
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s = l0+m0;
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idx = find(s == min(s), 1, 'first');
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l0 = l0(idx);
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m0 = m0(idx);
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if -l0*L + m0*M ~= 1
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error('Something went wrong!');
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end
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end
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