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/*
Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file test/audio_filter_test.cc
* @brief Test AudioFilter, LowPassAudioFilter, HighPassAudioFilter classes.
* @ingroup selfcontained
*/
#include <boost/test/unit_test.hpp>
#include "lib/audio_filter.h"
#include "lib/audio_buffers.h"
using std::make_shared;
static void
audio_filter_impulse_test_one (AudioFilter& f, int block_size, int num_blocks)
{
int c = 0;
for (int i = 0; i < num_blocks; ++i) {
auto in = make_shared<AudioBuffers>(1, block_size);
for (int j = 0; j < block_size; ++j) {
in->data()[0][j] = c + j;
}
auto out = f.run (in);
for (int j = 0; j < out->frames(); ++j) {
BOOST_CHECK_EQUAL (out->data()[0][j], c + j);
}
c += block_size;
}
}
/** Create a filter with an impulse as a kernel and check that it
* passes data through unaltered.
*/
BOOST_AUTO_TEST_CASE (audio_filter_impulse_kernel_test)
{
AudioFilter f (0.02);
f._ir.resize(f._M + 1);
f._ir[0] = 1;
for (int i = 1; i <= f._M; ++i) {
f._ir[i] = 0;
}
audio_filter_impulse_test_one (f, 32, 1);
audio_filter_impulse_test_one (f, 256, 1);
audio_filter_impulse_test_one (f, 2048, 1);
}
/** Create filters and pass them impulses as input and check that
* the filter kernels comes back.
*/
BOOST_AUTO_TEST_CASE (audio_filter_impulse_input_test)
{
LowPassAudioFilter lpf (0.02, 0.3);
auto in = make_shared<AudioBuffers>(1, 1751);
in->make_silent ();
in->data(0)[0] = 1;
auto out = lpf.run (in);
for (int j = 0; j < out->frames(); ++j) {
if (j <= lpf._M) {
BOOST_CHECK_EQUAL (out->data(0)[j], lpf._ir[j]);
} else {
BOOST_CHECK_EQUAL (out->data(0)[j], 0);
}
}
HighPassAudioFilter hpf (0.02, 0.3);
in = make_shared<AudioBuffers>(1, 9133);
in->make_silent ();
in->data(0)[0] = 1;
out = hpf.run (in);
for (int j = 0; j < out->frames(); ++j) {
if (j <= hpf._M) {
BOOST_CHECK_EQUAL (out->data(0)[j], hpf._ir[j]);
} else {
BOOST_CHECK_EQUAL (out->data(0)[j], 0);
}
}
}
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