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/*
* Copyright (C) 2003-2013 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_all.hxx"
extern "C" {
#include "pcm_dither.h"
}
#include <glib.h>
/**
* Generate a random 24 bit PCM sample.
*/
static int32_t
random24()
{
int32_t x = g_random_int() & 0xffffff;
if (x & 0x800000)
x |= 0xff000000;
return x;
}
void
test_pcm_dither_24()
{
struct pcm_dither dither;
pcm_dither_24_init(&dither);
enum { N = 256 };
int32_t src[N];
for (unsigned i = 0; i < N; ++i)
src[i] = random24();
int16_t dest[N];
pcm_dither_24_to_16(&dither, dest, src, src + N);
for (unsigned i = 0; i < N; ++i) {
g_assert_cmpint(dest[i], >=, (src[i] >> 8) - 8);
g_assert_cmpint(dest[i], <, (src[i] >> 8) + 8);
}
}
void
test_pcm_dither_32()
{
struct pcm_dither dither;
pcm_dither_24_init(&dither);
enum { N = 256 };
int32_t src[N];
for (unsigned i = 0; i < N; ++i)
src[i] = g_random_int();
int16_t dest[N];
pcm_dither_32_to_16(&dither, dest, src, src + N);
for (unsigned i = 0; i < N; ++i) {
g_assert_cmpint(dest[i], >=, (src[i] >> 16) - 8);
g_assert_cmpint(dest[i], <, (src[i] >> 16) + 8);
}
}
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