80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "test_pcm_all.h"
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#include "pcm_dither.h"
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#include <glib.h>
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/**
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* Generate a random 24 bit PCM sample.
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*/
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static int32_t
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random24(void)
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{
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int32_t x = g_random_int() & 0xffffff;
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if (x & 0x800000)
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x |= 0xff000000;
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return x;
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}
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void
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test_pcm_dither_24(void)
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{
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struct pcm_dither dither;
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pcm_dither_24_init(&dither);
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enum { N = 256 };
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int32_t src[N];
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for (unsigned i = 0; i < N; ++i)
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src[i] = random24();
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int16_t dest[N];
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pcm_dither_24_to_16(&dither, dest, src, src + N);
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for (unsigned i = 0; i < N; ++i) {
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g_assert_cmpint(dest[i], >=, (src[i] >> 8) - 8);
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g_assert_cmpint(dest[i], <, (src[i] >> 8) + 8);
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}
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}
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void
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test_pcm_dither_32(void)
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{
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struct pcm_dither dither;
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pcm_dither_24_init(&dither);
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enum { N = 256 };
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int32_t src[N];
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for (unsigned i = 0; i < N; ++i)
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src[i] = g_random_int();
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int16_t dest[N];
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pcm_dither_32_to_16(&dither, dest, src, src + N);
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for (unsigned i = 0; i < N; ++i) {
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g_assert_cmpint(dest[i], >=, (src[i] >> 16) - 8);
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g_assert_cmpint(dest[i], <, (src[i] >> 16) + 8);
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}
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}
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