2 Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 /** @file test/audio_filter_test.cc
23 * @brief Test AudioFilter, LowPassAudioFilter, HighPassAudioFilter classes.
24 * @ingroup selfcontained
28 #include <boost/test/unit_test.hpp>
29 #include "lib/audio_filter.h"
30 #include "lib/audio_buffers.h"
33 using std::make_shared;
34 using std::shared_ptr;
38 audio_filter_impulse_test_one (AudioFilter& f, int block_size, int num_blocks)
42 for (int i = 0; i < num_blocks; ++i) {
44 auto in = make_shared<AudioBuffers>(1, block_size);
45 for (int j = 0; j < block_size; ++j) {
46 in->data()[0][j] = c + j;
49 auto out = f.run (in);
51 for (int j = 0; j < out->frames(); ++j) {
52 BOOST_CHECK_EQUAL (out->data()[0][j], c + j);
60 /** Create a filter with an impulse as a kernel and check that it
61 * passes data through unaltered.
63 BOOST_AUTO_TEST_CASE (audio_filter_impulse_kernel_test)
67 f._ir.reserve(f._M + 1);
69 for (int i = 1; i <= f._M; ++i) {
73 audio_filter_impulse_test_one (f, 32, 1);
74 audio_filter_impulse_test_one (f, 256, 1);
75 audio_filter_impulse_test_one (f, 2048, 1);
79 /** Create filters and pass them impulses as input and check that
80 * the filter kernels comes back.
82 BOOST_AUTO_TEST_CASE (audio_filter_impulse_input_test)
84 LowPassAudioFilter lpf (0.02, 0.3);
86 auto in = make_shared<AudioBuffers>(1, 1751);
90 auto out = lpf.run (in);
91 for (int j = 0; j < out->frames(); ++j) {
93 BOOST_CHECK_EQUAL (out->data(0)[j], lpf._ir[j]);
95 BOOST_CHECK_EQUAL (out->data(0)[j], 0);
99 HighPassAudioFilter hpf (0.02, 0.3);
101 in = make_shared<AudioBuffers>(1, 9133);
106 for (int j = 0; j < out->frames(); ++j) {
108 BOOST_CHECK_EQUAL (out->data(0)[j], hpf._ir[j]);
110 BOOST_CHECK_EQUAL (out->data(0)[j], 0);