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/*
* Copyright 2003-2018 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "test_pcm_util.hxx"
#include "pcm/PcmDither.cxx"
#include <gtest/gtest.h>
TEST(PcmTest, Dither24)
{
constexpr unsigned N = 509;
const auto src = TestDataBuffer<int32_t, N>(RandomInt24());
int16_t dest[N];
PcmDither dither;
dither.Dither24To16(dest, src.begin(), src.end());
for (unsigned i = 0; i < N; ++i) {
EXPECT_GE(dest[i], (src[i] >> 8) - 8);
EXPECT_LT(dest[i], (src[i] >> 8) + 8);
}
}
TEST(PcmTest, Dither32)
{
constexpr unsigned N = 509;
const auto src = TestDataBuffer<int32_t, N>();
int16_t dest[N];
PcmDither dither;
dither.Dither32To16(dest, src.begin(), src.end());
for (unsigned i = 0; i < N; ++i) {
EXPECT_GE(dest[i], (src[i] >> 16) - 8);
EXPECT_LT(dest[i], (src[i] >> 16) + 8);
}
}