1function [l0, m0] = src_find_l0m0(L, M)
2
3% find_l0m0 - find l0, m0 to meet -l0*L + m0*M == 1
4%
5% [l0, m0] = find_l0m0(L, M)
6%
7% L - interpolatation factor
8% M - decimation factor
9%
10
11% Copyright (c) 2016, Intel Corporation
12% All rights reserved.
13%
14% Redistribution and use in source and binary forms, with or without
15% modification, are permitted provided that the following conditions are met:
16%   * Redistributions of source code must retain the above copyright
17%     notice, this list of conditions and the following disclaimer.
18%   * Redistributions in binary form must reproduce the above copyright
19%     notice, this list of conditions and the following disclaimer in the
20%     documentation and/or other materials provided with the distribution.
21%   * Neither the name of the Intel Corporation nor the
22%     names of its contributors may be used to endorse or promote products
23%     derived from this software without specific prior written permission.
24%
25% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35% POSSIBILITY OF SUCH DAMAGE.
36%
37% Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
38%
39
40if M == 1
41        l0 = 0;
42        m0 = 1;
43        return
44end
45
46if L == 1
47        l0 = 1;
48        m0 = 0;
49        return
50end
51
52l0 = [];
53m0 = [];
54for lt=1:4*L
55        mt = (1+lt*L)/M; % Check if -lt*L + mt*M == 1
56        if floor(mt) == mt
57                l0 = [l0 lt];
58                m0 = [m0 mt];
59        end
60end
61
62s = l0+m0;
63idx = find(s == min(s), 1, 'first');
64l0 = l0(idx);
65m0 = m0(idx);
66
67if -l0*L + m0*M ~= 1
68        error('Something went wrong!');
69end
70
71end
72