1 files changed, 114 insertions, 0 deletions
diff --git a/src/tests/mult-s16-test.c b/src/tests/mult-s16-test.c
new file mode 100644
index 0000000..91740c2
--- /dev/null
+++ b/src/tests/mult-s16-test.c
@@ -0,0 +1,114 @@
+/***
+  This file is part of PulseAudio.
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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 Lesser General Public License
+  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <check.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include <pulse/rtclock.h>
+#include <pulsecore/random.h>
+#include <pulsecore/macro.h>
+
+#include "runtime-test-util.h"
+
+static inline int32_t pa_mult_s16_volume_32(int16_t v, int32_t cv) {
+    /* Multiplying the 32 bit volume factor with the
+     * 16 bit sample might result in an 48 bit value. We
+     * want to do without 64 bit integers and hence do
+     * the multiplication independently for the HI and
+     * LO part of the volume. */
+    int32_t hi = cv >> 16;
+    int32_t lo = cv & 0xFFFF;
+    return ((v * lo) >> 16) + (v * hi);
+}
+
+static inline int32_t pa_mult_s16_volume_64(int16_t v, int32_t cv) {
+    /* Multiply with 64 bit integers on 64 bit platforms */
+    return (v * (int64_t) cv) >> 16;
+}
+
+#define SAMPLES 1028
+#define TIMES 10000
+#define TIMES2 100
+
+START_TEST (mult_s16_test) {
+    int16_t samples[SAMPLES];
+    int32_t volumes[SAMPLES];
+    int32_t sum1 = 0, sum2 = 0;
+    int i;
+
+    pa_random(samples, sizeof(samples));
+    pa_random(volumes, sizeof(volumes));
+
+    for (i = 0; i < SAMPLES; i++) {
+        int32_t a = pa_mult_s16_volume_32(samples[i], volumes[i]);
+        int32_t b = pa_mult_s16_volume_64(samples[i], volumes[i]);
+
+        if (a != b) {
+            pa_log_debug("%d: %d != %d", i, a, b);
+            ck_abort();
+        }
+    }
+
+    PA_RUNTIME_TEST_RUN_START("32 bit mult", TIMES, TIMES2) {
+        for (i = 0; i < SAMPLES; i++) {
+            sum1 += pa_mult_s16_volume_32(samples[i], volumes[i]);
+        }
+    } PA_RUNTIME_TEST_RUN_STOP
+
+    PA_RUNTIME_TEST_RUN_START("64 bit mult", TIMES, TIMES2) {
+        for (i = 0; i < SAMPLES; i++)
+            sum2 += pa_mult_s16_volume_64(samples[i], volumes[i]);
+    } PA_RUNTIME_TEST_RUN_STOP
+
+    fail_unless(sum1 == sum2);
+}
+END_TEST
+
+int main(int argc, char *argv[]) {
+    int failed = 0;
+    Suite *s;
+    TCase *tc;
+    SRunner *sr;
+
+    if (!getenv("MAKE_CHECK"))
+        pa_log_set_level(PA_LOG_DEBUG);
+
+#ifdef HAVE_FAST_64BIT_OPERATIONS
+    pa_log_debug("Detected CPU with fast 64-bit operations.");
+#else
+    pa_log_debug("Not detected CPU with fast 64-bit operations.");
+#endif
+
+    s = suite_create("Mult-s16");
+    tc = tcase_create("mult-s16");
+    tcase_add_test(tc, mult_s16_test);
+    tcase_set_timeout(tc, 120);
+    suite_add_tcase(s, tc);
+
+    sr = srunner_create(s);
+    srunner_run_all(sr, CK_NORMAL);
+    failed = srunner_ntests_failed(sr);
+    srunner_free(sr);
+
+    return (failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
+}