test: add unit test for the PCM library

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]);
+	}
+}