test/test_pcm: add pcm_volume tests

Makefile.am

@@ -1316,6 +1316,7 @@ test_test_pcm_SOURCES = \
 	test/test_pcm_dither.c \
 	test/test_pcm_pack.c \
 	test/test_pcm_channels.c \
+	test/test_pcm_volume.c \
 	test/test_pcm_all.h \
 	test/test_pcm_main.c
 test_test_pcm_LDADD = \

test/test_pcm_all.h

@@ -38,4 +38,19 @@ test_pcm_channels_16(void);
 void
 test_pcm_channels_32(void);
 
+void
+test_pcm_volume_8(void);
+
+void
+test_pcm_volume_16(void);
+
+void
+test_pcm_volume_24(void);
+
+void
+test_pcm_volume_32(void);
+
+void
+test_pcm_volume_float(void);
+
 #endif

test/test_pcm_main.c

@@ -32,5 +32,11 @@ main(int argc, char **argv)
 	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/volume/8", test_pcm_volume_8);
+	g_test_add_func("/pcm/volume/16", test_pcm_volume_16);
+	g_test_add_func("/pcm/volume/24", test_pcm_volume_24);
+	g_test_add_func("/pcm/volume/32", test_pcm_volume_32);
+	g_test_add_func("/pcm/volume/float", test_pcm_volume_float);
+
 	g_test_run();
 }

test/test_pcm_volume.c

@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2003-2012 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_volume.h"
+
+#include <glib.h>
+
+#include <string.h>
+
+void
+test_pcm_volume_8(void)
+{
+	enum { N = 256 };
+	static const int8_t zero[N];
+	int8_t src[N];
+	for (unsigned i = 0; i < N; ++i)
+		src[i] = g_random_int();
+
+	int8_t dest[N];
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S8,
+				   0), ==, true);
+	g_assert_cmpint(memcmp(dest, zero, sizeof(zero)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S8,
+				   PCM_VOLUME_1), ==, true);
+	g_assert_cmpint(memcmp(dest, src, sizeof(src)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S8,
+				   PCM_VOLUME_1 / 2), ==, true);
+
+	for (unsigned i = 0; i < N; ++i) {
+		g_assert_cmpint(dest[i], >=, (src[i] - 1) / 2);
+		g_assert_cmpint(dest[i], <=, src[i] / 2 + 1);
+	}
+}
+
+void
+test_pcm_volume_16(void)
+{
+	enum { N = 256 };
+	static const int16_t zero[N];
+	int16_t src[N];
+	for (unsigned i = 0; i < N; ++i)
+		src[i] = g_random_int();
+
+	int16_t dest[N];
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S16,
+				   0), ==, true);
+	g_assert_cmpint(memcmp(dest, zero, sizeof(zero)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S16,
+				   PCM_VOLUME_1), ==, true);
+	g_assert_cmpint(memcmp(dest, src, sizeof(src)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S16,
+				   PCM_VOLUME_1 / 2), ==, true);
+
+	for (unsigned i = 0; i < N; ++i) {
+		g_assert_cmpint(dest[i], >=, (src[i] - 1) / 2);
+		g_assert_cmpint(dest[i], <=, src[i] / 2 + 1);
+	}
+}
+
+/**
+ * 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_volume_24(void)
+{
+	enum { N = 256 };
+	static const int32_t zero[N];
+	int32_t src[N];
+	for (unsigned i = 0; i < N; ++i)
+		src[i] = random24();
+
+	int32_t dest[N];
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S24_P32,
+				   0), ==, true);
+	g_assert_cmpint(memcmp(dest, zero, sizeof(zero)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S24_P32,
+				   PCM_VOLUME_1), ==, true);
+	g_assert_cmpint(memcmp(dest, src, sizeof(src)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S24_P32,
+				   PCM_VOLUME_1 / 2), ==, true);
+
+	for (unsigned i = 0; i < N; ++i) {
+		g_assert_cmpint(dest[i], >=, (src[i] - 1) / 2);
+		g_assert_cmpint(dest[i], <=, src[i] / 2 + 1);
+	}
+}
+
+void
+test_pcm_volume_32(void)
+{
+	enum { N = 256 };
+	static const int32_t zero[N];
+	int32_t src[N];
+	for (unsigned i = 0; i < N; ++i)
+		src[i] = g_random_int();
+
+	int32_t dest[N];
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S32,
+				   0), ==, true);
+	g_assert_cmpint(memcmp(dest, zero, sizeof(zero)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S32,
+				   PCM_VOLUME_1), ==, true);
+	g_assert_cmpint(memcmp(dest, src, sizeof(src)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_S32,
+				   PCM_VOLUME_1 / 2), ==, true);
+
+	for (unsigned i = 0; i < N; ++i) {
+		g_assert_cmpint(dest[i], >=, (src[i] - 1) / 2);
+		g_assert_cmpint(dest[i], <=, src[i] / 2 + 1);
+	}
+}
+
+void
+test_pcm_volume_float(void)
+{
+	enum { N = 256 };
+	static const float zero[N];
+	float src[N];
+	for (unsigned i = 0; i < N; ++i)
+		src[i] = g_random_double_range(-1.0, 1.0);
+
+	float dest[N];
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_FLOAT,
+				   0), ==, true);
+	g_assert_cmpint(memcmp(dest, zero, sizeof(zero)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_FLOAT,
+				   PCM_VOLUME_1), ==, true);
+	g_assert_cmpint(memcmp(dest, src, sizeof(src)), ==, 0);
+
+	memcpy(dest, src, sizeof(src));
+	g_assert_cmpint(pcm_volume(dest, sizeof(dest), SAMPLE_FORMAT_FLOAT,
+				   PCM_VOLUME_1 / 2), ==, true);
+
+	for (unsigned i = 0; i < N; ++i)
+		g_assert_cmpfloat(dest[i], ==, src[i] / 2);
+}