test: add unit test for the PCM library

Makefile.am

@@ -937,6 +937,7 @@ sparse-check:
 if ENABLE_TEST
 
 C_TESTS = \
+	test/test_pcm \
 	test/test_queue_priority
 
 TESTS = $(C_TESTS)
@@ -1193,6 +1194,17 @@ test_run_inotify_SOURCES = test/run_inotify.c \
 test_run_inotify_LDADD = $(GLIB_LIBS)
 endif
 
+test_test_pcm_SOURCES = \
+	test/test_pcm_dither.c \
+	test/test_pcm_pack.c \
+	test/test_pcm_channels.c \
+	test/test_pcm_byteswap.c \
+	test/test_pcm_all.h \
+	test/test_pcm_main.c
+test_test_pcm_LDADD = \
+	$(PCM_LIBS) \
+	$(GLIB_LIBS)
+
 test_test_queue_priority_SOURCES = \
 	src/queue.c \
 	test/test_queue_priority.c

test/test_pcm_all.h

@@ -0,0 +1,47 @@
+/*
+ * 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.
+ */
+
+#ifndef MPD_TEST_PCM_ALL_H
+#define MPD_TEST_PCM_ALL_H
+
+void
+test_pcm_dither_24(void);
+
+void
+test_pcm_dither_32(void);
+
+void
+test_pcm_pack_24(void);
+
+void
+test_pcm_unpack_24(void);
+
+void
+test_pcm_channels_16(void);
+
+void
+test_pcm_channels_32(void);
+
+void
+test_pcm_byteswap_16(void);
+
+void
+test_pcm_byteswap_32(void);
+
+#endif

test/test_pcm_byteswap.c

@@ -0,0 +1,62 @@
+/*
+ * 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_byteswap.h"
+#include "pcm_buffer.h"
+
+#include <glib.h>
+
+void
+test_pcm_byteswap_16(void)
+{
+	enum { N = 256 };
+	int16_t src[N];
+
+	for (unsigned i = 0; i < G_N_ELEMENTS(src); ++i)
+		src[i] = g_random_int();
+
+	struct pcm_buffer buffer;
+	pcm_buffer_init(&buffer);
+
+	const int16_t *dest = pcm_byteswap_16(&buffer, src, sizeof(src));
+	g_assert(dest != NULL);
+	for (unsigned i = 0; i < N; ++i)
+		g_assert_cmpint(dest[i], ==,
+				(int16_t)GUINT16_SWAP_LE_BE(src[i]));
+}
+
+void
+test_pcm_byteswap_32(void)
+{
+	enum { N = 256 };
+	int32_t src[N];
+
+	for (unsigned i = 0; i < G_N_ELEMENTS(src); ++i)
+		src[i] = g_random_int();
+
+	struct pcm_buffer buffer;
+	pcm_buffer_init(&buffer);
+
+	const int32_t *dest = pcm_byteswap_32(&buffer, src, sizeof(src));
+	g_assert(dest != NULL);
+	for (unsigned i = 0; i < N; ++i)
+		g_assert_cmpint(dest[i], ==,
+				(int32_t)GUINT32_SWAP_LE_BE(src[i]));
+}

test/test_pcm_channels.c

@@ -0,0 +1,100 @@
+/*
+ * 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_channels.h"
+#include "pcm_buffer.h"
+
+#include <glib.h>
+
+void
+test_pcm_channels_16(void)
+{
+	enum { N = 256 };
+	int16_t src[N * 2];
+
+	for (unsigned i = 0; i < G_N_ELEMENTS(src); ++i)
+		src[i] = g_random_int();
+
+	struct pcm_buffer buffer;
+	pcm_buffer_init(&buffer);
+
+	/* stereo to mono */
+
+	size_t dest_size;
+	const int16_t *dest =
+		pcm_convert_channels_16(&buffer, 1, 2, src, sizeof(src),
+					&dest_size);
+	g_assert(dest != NULL);
+	g_assert_cmpint(dest_size, ==, sizeof(src) / 2);
+	for (unsigned i = 0; i < N; ++i)
+		g_assert_cmpint(dest[i], ==,
+				(src[i * 2] + src[i * 2 + 1]) / 2);
+
+	/* mono to stereo */
+
+	dest = pcm_convert_channels_16(&buffer, 2, 1, src, sizeof(src),
+				       &dest_size);
+	g_assert(dest != NULL);
+	g_assert_cmpint(dest_size, ==, sizeof(src) * 2);
+	for (unsigned i = 0; i < N; ++i) {
+		g_assert_cmpint(dest[i * 2], ==, src[i]);
+		g_assert_cmpint(dest[i * 2 + 1], ==, src[i]);
+	}
+
+	pcm_buffer_deinit(&buffer);
+}
+
+void
+test_pcm_channels_32(void)
+{
+	enum { N = 256 };
+	int32_t src[N * 2];
+
+	for (unsigned i = 0; i < G_N_ELEMENTS(src); ++i)
+		src[i] = g_random_int();
+
+	struct pcm_buffer buffer;
+	pcm_buffer_init(&buffer);
+
+	/* stereo to mono */
+
+	size_t dest_size;
+	const int32_t *dest =
+		pcm_convert_channels_32(&buffer, 1, 2, src, sizeof(src),
+					&dest_size);
+	g_assert(dest != NULL);
+	g_assert_cmpint(dest_size, ==, sizeof(src) / 2);
+	for (unsigned i = 0; i < N; ++i)
+		g_assert_cmpint(dest[i], ==,
+				((int64_t)src[i * 2] + (int64_t)src[i * 2 + 1]) / 2);
+
+	/* mono to stereo */
+
+	dest = pcm_convert_channels_32(&buffer, 2, 1, src, sizeof(src),
+				       &dest_size);
+	g_assert(dest != NULL);
+	g_assert_cmpint(dest_size, ==, sizeof(src) * 2);
+	for (unsigned i = 0; i < N; ++i) {
+		g_assert_cmpint(dest[i * 2], ==, src[i]);
+		g_assert_cmpint(dest[i * 2 + 1], ==, src[i]);
+	}
+
+	pcm_buffer_deinit(&buffer);
+}

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 <glib.h>
+
+/**
+ * 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);
+	}
+}

test/test_pcm_main.c

@@ -0,0 +1,38 @@
+/*
+ * 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 <glib.h>
+
+int
+main(int argc, char **argv)
+{
+	g_test_init (&argc, &argv, NULL);
+	g_test_add_func("/pcm/dither/24", test_pcm_dither_24);
+	g_test_add_func("/pcm/dither/32", test_pcm_dither_32);
+	g_test_add_func("/pcm/pack/pack24", test_pcm_pack_24);
+	g_test_add_func("/pcm/pack/unpack24", test_pcm_unpack_24);
+	g_test_add_func("/pcm/channels/16", test_pcm_channels_16);
+	g_test_add_func("/pcm/channels/32", test_pcm_channels_32);
+	g_test_add_func("/pcm/byteswap/16", test_pcm_byteswap_16);
+	g_test_add_func("/pcm/byteswap/32", test_pcm_byteswap_32);
+
+	g_test_run();
+}

test/test_pcm_pack.c

@@ -0,0 +1,89 @@
+/*
+ * 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_pack.h"
+
+#include <glib.h>
+
+/**
+ * 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_pack_24(void)
+{
+	enum { N = 256 };
+	int32_t src[N * 3];
+	for (unsigned i = 0; i < N; ++i)
+		src[i] = random24();
+
+	uint8_t dest[N * 3];
+
+	pcm_pack_24(dest, src, N, false);
+
+	for (unsigned i = 0; i < N; ++i) {
+		int32_t d;
+		if (G_BYTE_ORDER == G_BIG_ENDIAN)
+			d = (dest[i * 3] << 16) | (dest[i * 3 + 1] << 8)
+				| dest[i * 3 + 2];
+		else
+			d = (dest[i * 3 + 2] << 16) | (dest[i * 3 + 1] << 8)
+				| dest[i * 3];
+		if (d & 0x800000)
+			d |= 0xff000000;
+
+		g_assert_cmpint(d, ==, src[i]);
+	}
+}
+
+void
+test_pcm_unpack_24(void)
+{
+	enum { N = 256 };
+	uint8_t src[N * 3];
+	for (unsigned i = 0; i < G_N_ELEMENTS(src); ++i)
+		src[i] = g_random_int_range(0, 256);
+
+	int32_t dest[N];
+
+	pcm_unpack_24(dest, src, N, false);
+
+	for (unsigned i = 0; i < N; ++i) {
+		int32_t s;
+		if (G_BYTE_ORDER == G_BIG_ENDIAN)
+			s = (src[i * 3] << 16) | (src[i * 3 + 1] << 8)
+				| src[i * 3 + 2];
+		else
+			s = (src[i * 3 + 2] << 16) | (src[i * 3 + 1] << 8)
+				| src[i * 3];
+		if (s & 0x800000)
+			s |= 0xff000000;
+
+		g_assert_cmpint(s, ==, dest[i]);
+	}
+}