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diff --git a/audio/tests/KSPosTst/PreComp.h b/audio/tests/KSPosTst/PreComp.h
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+// ------------------------------------------------------------------------------
+//
+// Copyright (C) Microsoft Corporation. All rights reserved.
+//
+// File Name:
+//
+//  PreComp.h
+//
+// Abstract:
+//
+//  Precompiled common headers
+//
+// -------------------------------------------------------------------------------
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+// Number of milliseconds that the test will be delayed to wait for the stream to stabilize
+#define DELAY_FOR_STABILIZE 100
+
+// Number of milliseconds in a second
+#define MILLISECONDS_PER_SECOND 1000
+
+// Number of HNS units in one second
+#define HNSTIME_UNITS_PER_SECOND 10000000
+
+// Number of HNS units in one millisecond
+#define HNSTIME_UNITS_PER_MILLISECOND 10000
+
+typedef double (*TIMEPROC) (void);
+double  tpQPC(void);
+
+typedef struct _tag_tm
+{
+    TIMEPROC    Proc;
+    LPCSTR      strRep;
+} TIMER_MECHANISM, * PTIMER_MECHANISM;
+
+// ----------------------------------------------------------
+// Timer functions
+extern "C" __kernel_entry NTSYSCALLAPI NTSTATUS NTAPI NtSetTimerResolution(
+    _In_ ULONG DesiredTime, _In_ BOOLEAN SetResolution, _Out_ PULONG ActualTime);
+
+// 1 ms timer resolution
+static ULONG timerResolution = (1 * 10000);
+static ULONG actualTimerResolution;
+
+// ------------------------------------------------------------------------------
+// structs used to hold results of perf tests
+#define DATA_POINTS     100
+
+typedef struct
+{
+    double testTime;     // Time the sample was taken, in milliseconds, relative to the start of the sample collection
+    double positionTime; // Time of the reported position, in milliseconds, relative to the start of the sample collection
+    double position;     // Position, in seconds, relative to the start of the sample collection
+} POSITION_SET, * PPOSITION_SET;
+
+typedef struct
+{
+    PPOSITION_SET   argPosSets;
+    ULONG           cPosSets;
+    ULONG           ctLatencyMeas;
+    ULONG           csBufferMeas;
+    double          bytesPerSecond; // measured (in bytes/sec, NOT samples/sec)
+    double          dOffset;        // measured
+} PERF_RESULTS, * PPERF_RESULTS;
+
+typedef struct
+{
+    WAVEFORMATEXTENSIBLE    wfxFormat;
+    PERF_RESULTS            perfResults;        // 
+} FORMAT_ENTRY, * PFORMAT_ENTRY;