1 files changed, 50 insertions, 0 deletions
diff --git a/audio/tests/KSPosTst/timetest.cpp b/audio/tests/KSPosTst/timetest.cpp
new file mode 100644
index 00000000..d8026716
--- /dev/null
+++ b/audio/tests/KSPosTst/timetest.cpp
@@ -0,0 +1,50 @@
+// ------------------------------------------------------------------------------
+//
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//
+// Module Name:
+//
+//  timetest.cpp
+//
+// Abstract:
+//
+//  Functions to precisely measure time.
+//
+// -------------------------------------------------------------------------------
+
+#include "PreComp.h"
+#include <math.h>
+
+// ------------------------------------------------------------------------------
+// returns millisecs
+double tpQPC (void)
+{
+    static LARGE_INTEGER liFrequency = { 0 };
+    static LARGE_INTEGER liStart = { 0 };
+    static bool bInitialized = false;
+
+    if (!bInitialized)
+    {
+        if (!QueryPerformanceFrequency(&liFrequency))
+        {
+            throw ("QueryPerformanceFrequency failed");
+        }
+        
+        if (!QueryPerformanceCounter(&liStart))
+        {
+            throw ("QueryPerformanceCounter failed");
+        }
+        
+        bInitialized = true;
+    }
+
+    LARGE_INTEGER liNow = { 0 };
+
+    if (!QueryPerformanceCounter(&liNow))
+    {
+        throw ("QueryPerformanceCounter failed");
+    }
+
+    // milliseconds since test start
+    return 1000.0 * (liNow.QuadPart - liStart.QuadPart) / liFrequency.QuadPart;
+}