2 Copyright (C) 2014 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/>.
21 /** @file test/audio_filter_test.cc
22 * @brief Basic tests of audio filters.
25 #include "lib/audio_filter.h"
26 #include "lib/audio_buffers.h"
27 #include <boost/test/unit_test.hpp>
28 #include <boost/make_shared.hpp>
30 using boost::shared_ptr;
31 using boost::make_shared;
34 audio_filter_impulse_test_one (AudioFilter& f, int block_size, int num_blocks)
38 for (int i = 0; i < num_blocks; ++i) {
40 shared_ptr<AudioBuffers> in = make_shared<AudioBuffers> (1, block_size);
41 for (int j = 0; j < block_size; ++j) {
42 in->data()[0][j] = c + j;
45 shared_ptr<AudioBuffers> out = f.run (in);
47 for (int j = 0; j < out->frames(); ++j) {
48 BOOST_CHECK_EQUAL (out->data()[0][j], c + j);
55 /** Create a filter with an impulse as a kernel and check that it
56 * passes data through unaltered.
58 BOOST_AUTO_TEST_CASE (audio_filter_impulse_kernel_test)
62 f._ir = new float[f._M + 1];
65 for (int i = 1; i <= f._M; ++i) {
69 audio_filter_impulse_test_one (f, 32, 1);
70 audio_filter_impulse_test_one (f, 256, 1);
71 audio_filter_impulse_test_one (f, 2048, 1);
74 /** Create filters and pass them impulses as input and check that
75 * the filter kernels comes back.
77 BOOST_AUTO_TEST_CASE (audio_filter_impulse_input_test)
79 LowPassAudioFilter lpf (0.02, 0.3);
81 shared_ptr<AudioBuffers> in = make_shared<AudioBuffers> (1, 1751);
85 shared_ptr<AudioBuffers> out = lpf.run (in);
86 for (int j = 0; j < out->frames(); ++j) {
88 BOOST_CHECK_EQUAL (out->data(0)[j], lpf._ir[j]);
90 BOOST_CHECK_EQUAL (out->data(0)[j], 0);
94 HighPassAudioFilter hpf (0.02, 0.3);
96 in.reset (new AudioBuffers (1, 9133));
101 for (int j = 0; j < out->frames(); ++j) {
103 BOOST_CHECK_EQUAL (out->data(0)[j], hpf._ir[j]);
105 BOOST_CHECK_EQUAL (out->data(0)[j], 0);