test_pcm_dither.cxx 1.56 KB
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/*
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 * Copyright (C) 2003-2015 The Music Player Daemon Project
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 * 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.
 */

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#include "test_pcm_all.hxx"
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#include "test_pcm_util.hxx"
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#include "pcm/PcmDither.cxx"
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void
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PcmDitherTest::TestDither24()
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{
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	constexpr unsigned N = 509;
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	const auto src = TestDataBuffer<int32_t, N>(RandomInt24());
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	int16_t dest[N];
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	PcmDither dither;
	dither.Dither24To16(dest, src.begin(), src.end());
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	for (unsigned i = 0; i < N; ++i) {
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		CPPUNIT_ASSERT(dest[i] >= (src[i] >> 8) - 8);
		CPPUNIT_ASSERT(dest[i] < (src[i] >> 8) + 8);
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	}
}

void
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PcmDitherTest::TestDither32()
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{
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	constexpr unsigned N = 509;
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	const auto src = TestDataBuffer<int32_t, N>();
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	int16_t dest[N];
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	PcmDither dither;
	dither.Dither32To16(dest, src.begin(), src.end());
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	for (unsigned i = 0; i < N; ++i) {
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		CPPUNIT_ASSERT(dest[i] >= (src[i] >> 16) - 8);
		CPPUNIT_ASSERT(dest[i] < (src[i] >> 16) + 8);
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	}
}