From 572d8d0cc486dce64c0f6239cc27598068c1085d Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Sun, 9 Oct 2011 13:22:08 +0200 Subject: test: add unit test for the PCM library --- test/test_pcm_dither.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 test/test_pcm_dither.c (limited to 'test/test_pcm_dither.c') diff --git a/test/test_pcm_dither.c b/test/test_pcm_dither.c new file mode 100644 index 000000000..889c61ccd --- /dev/null +++ b/test/test_pcm_dither.c @@ -0,0 +1,79 @@ +/* + * Copyright (C) 2003-2011 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.h" +#include "pcm_dither.h" + +#include + +/** + * Generate a random 24 bit PCM sample. + */ +static int32_t +random24(void) +{ + int32_t x = g_random_int() & 0xffffff; + if (x & 0x800000) + x |= 0xff000000; + return x; +} + +void +test_pcm_dither_24(void) +{ + 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, 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(void) +{ + 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, 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); + } +} -- cgit v1.2.3