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/*++
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;
}
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