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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:
PositionSimClock.cpp
Abstract:
Simulated clock for keeping track of stream position.
Environment:
Kernel mode
--*/
#include "private.h"
#include "PositionSimClock.h"
#ifndef __INTELLISENSE__
#include "positionsimclock.tmh"
#endif
_Use_decl_annotations_
PAGED_CODE_SEG
CPositionSimClock::CPositionSimClock()
{
PAGED_CODE();
m_State = SIM_CLOCK_STATE_STOP;
m_ElapsedTimeWhenPaused = 0;
m_StartTime = 0;
m_QpcTimeStamp = 0;
KeInitializeSpinLock(&m_Lock);
}
#pragma code_seg()
_Use_decl_annotations_
CPositionSimClock::~CPositionSimClock()
{
}
#pragma code_seg()
_Use_decl_annotations_
void CPositionSimClock::Run()
{
KIRQL irql = PASSIVE_LEVEL;
KeAcquireSpinLock(&m_Lock, &irql);
if (m_State == SIM_CLOCK_STATE_STOP ||
m_State == SIM_CLOCK_STATE_PAUSE)
{
m_StartTime = KeQueryInterruptTimePrecise(&m_QpcTimeStamp);
}
m_State = SIM_CLOCK_STATE_RUN;
DrvLogInfo(g_SDCAVDspLog, FLAG_STREAM, L"CPositionSimClock::Run SIM_CLOCK_STATE_RUN : %lld", m_StartTime);
KeReleaseSpinLock(&m_Lock, irql);
}
#pragma code_seg()
_Use_decl_annotations_
void CPositionSimClock::Pause()
{
KIRQL irql = PASSIVE_LEVEL;
KeAcquireSpinLock(&m_Lock, &irql);
if (m_State == SIM_CLOCK_STATE_RUN)
{
m_ElapsedTimeWhenPaused = GetElapsedTimeUnlocked();
DrvLogInfo(g_SDCAVDspLog, FLAG_STREAM, L"CPositionSimClock::Pause ElapsedTimeWhenPaused : %lld", m_ElapsedTimeWhenPaused);
}
m_State = SIM_CLOCK_STATE_PAUSE;
KeReleaseSpinLock(&m_Lock, irql);
}
#pragma code_seg()
_Use_decl_annotations_
void CPositionSimClock::Stop()
{
KIRQL irql = PASSIVE_LEVEL;
KeAcquireSpinLock(&m_Lock, &irql);
m_State = SIM_CLOCK_STATE_STOP;
m_StartTime = 0;
m_ElapsedTimeWhenPaused = 0;
DrvLogInfo(g_SDCAVDspLog, FLAG_STREAM, L"CPositionSimClock::Stop");
KeReleaseSpinLock(&m_Lock, irql);
}
#pragma code_seg()
_Use_decl_annotations_
ULONGLONG CPositionSimClock::GetElapsedTimeUnlocked()
{
ULONGLONG current_time = KeQueryInterruptTimePrecise(&m_QpcTimeStamp);
ULONGLONG elapsedTime = (current_time - m_StartTime) + m_ElapsedTimeWhenPaused;
return elapsedTime;
}
#pragma code_seg()
_Use_decl_annotations_
ULONGLONG CPositionSimClock::GetElapsedTime(PULONGLONG pQpcTimeStamp)
{
KIRQL irql = PASSIVE_LEVEL;
KeAcquireSpinLock(&m_Lock, &irql);
ULONGLONG elapsedTime = 0;
if (m_State == SIM_CLOCK_STATE_RUN)
{
elapsedTime = GetElapsedTimeUnlocked();
}
else
{
elapsedTime = m_ElapsedTimeWhenPaused;
}
if (pQpcTimeStamp)
{
*pQpcTimeStamp = m_QpcTimeStamp;
}
KeReleaseSpinLock(&m_Lock, irql);
return elapsedTime;
}
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