1 files changed, 106 insertions, 0 deletions
diff --git a/audio/Acx/Samples/Common/SimPeakMeter.cpp b/audio/Acx/Samples/Common/SimPeakMeter.cpp
new file mode 100644
index 00000000..0dfbd4e5
--- /dev/null
+++ b/audio/Acx/Samples/Common/SimPeakMeter.cpp
@@ -0,0 +1,106 @@
+/*++
+
+    THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
+    KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
+    PURPOSE.
+
+Module Name:
+
+    SimPeakMeter.cpp
+
+Abstract:
+
+    Virtual Peakmeter - aggregates all streams
+
+Environment:
+
+    Kernel mode
+
+--*/
+
+#include "private.h"
+#include "SimPeakMeter.h"
+
+#ifndef __INTELLISENSE__
+#include "SimPeakMeter.tmh"
+#endif
+
+_Use_decl_annotations_
+PAGED_CODE_SEG
+CSimPeakMeter::CSimPeakMeter()
+{
+    PAGED_CODE();
+    m_NumStreams = 0;
+    m_PeakMeterIndex = 0;
+}
+
+_Use_decl_annotations_
+PAGED_CODE_SEG
+CSimPeakMeter::~CSimPeakMeter()
+{
+    PAGED_CODE();
+}
+
+_Use_decl_annotations_
+PAGED_CODE_SEG
+LONG CSimPeakMeter::GetValue(ULONG Channel)
+{
+    PAGED_CODE();
+
+    // Ignore channel
+    UNREFERENCED_PARAMETER(Channel);
+
+#define PEAKMETER_VALUE_FULL        (PEAKMETER_MAXIMUM / PEAKMETER_STEPPING_DELTA * PEAKMETER_STEPPING_DELTA)
+#define PEAKMETER_VALUE_HALF        (PEAKMETER_MAXIMUM / 2 / PEAKMETER_STEPPING_DELTA * PEAKMETER_STEPPING_DELTA)
+#define PEAKMETER_VALUE_QUARTER     (PEAKMETER_MAXIMUM / 4 / PEAKMETER_STEPPING_DELTA * PEAKMETER_STEPPING_DELTA)
+#define PEAKMETER_VALUE_ONE_EIGTH   (PEAKMETER_MAXIMUM / 8 / PEAKMETER_STEPPING_DELTA * PEAKMETER_STEPPING_DELTA)
+
+    LONG PeakMeterValues[] = {
+    PEAKMETER_VALUE_ONE_EIGTH,
+    PEAKMETER_VALUE_QUARTER,
+    PEAKMETER_VALUE_HALF,
+    PEAKMETER_VALUE_FULL,
+    PEAKMETER_VALUE_HALF,
+    PEAKMETER_VALUE_QUARTER
+    };
+
+    if (m_NumStreams)
+    {
+        LONG pmi = InterlockedIncrement(&m_PeakMeterIndex);
+        if (pmi == ARRAYSIZE(PeakMeterValues))
+        {
+            pmi = 0;
+            InterlockedExchange(&m_PeakMeterIndex, 0);
+        }
+
+        return PeakMeterValues[pmi];
+    }
+
+    //
+    // No active streams. Peak meter = 0
+    //
+    return 0;
+}
+
+_Use_decl_annotations_
+PAGED_CODE_SEG
+NTSTATUS CSimPeakMeter::StartStream()
+{
+    PAGED_CODE();
+    InterlockedIncrement(&m_NumStreams);
+
+    return STATUS_SUCCESS;
+}
+
+_Use_decl_annotations_
+PAGED_CODE_SEG
+NTSTATUS CSimPeakMeter::StopStream()
+{
+    PAGED_CODE();
+
+    ASSERT(m_NumStreams);
+    InterlockedDecrement(&m_NumStreams);
+
+    return STATUS_SUCCESS;
+}