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#include "pch.h"
#include "MyClock.h"
namespace SaneAudioRenderer
{
MyClock::MyClock(IUnknown* pUnknown, HRESULT& result)
: CBaseReferenceClock(L"SaneAudioRenderer::MyClock", pUnknown, &result)
, m_performanceFrequency(GetPerformanceFrequency())
{
}
STDMETHODIMP MyClock::NonDelegatingQueryInterface(REFIID riid, void** ppv)
{
return CBaseReferenceClock::NonDelegatingQueryInterface(riid, ppv);
}
REFERENCE_TIME MyClock::GetPrivateTime()
{
CAutoLock lock(this);
REFERENCE_TIME audioClockTime, audioClockCounterTime;
if (SUCCEEDED(GetAudioClockTime(&audioClockTime, &audioClockCounterTime)))
{
m_counterOffset = audioClockTime - audioClockCounterTime;
return audioClockTime;
}
return m_counterOffset + llMulDiv(GetPerformanceCounter(), OneSecond, m_performanceFrequency, 0);
}
void MyClock::SlaveClockToAudio(IAudioClock* pAudioClock, int64_t audioStart)
{
CAutoLock lock(this);
m_audioClock = pAudioClock;
m_audioStart = audioStart;
m_audioOffset = 0;
}
void MyClock::UnslaveClockFromAudio()
{
CAutoLock lock(this);
m_audioClock = nullptr;
}
void MyClock::OffsetSlavedClock(REFERENCE_TIME offsetTime)
{
CAutoLock lock(this);
m_audioOffset += offsetTime;
}
HRESULT MyClock::GetAudioClockTime(REFERENCE_TIME* pAudioTime, REFERENCE_TIME* pCounterTime)
{
CheckPointer(pAudioTime, E_POINTER);
CAutoLock lock(this);
if (m_audioClock)
{
uint64_t audioFrequency, audioPosition, audioTime;
if (SUCCEEDED(m_audioClock->GetFrequency(&audioFrequency)) &&
SUCCEEDED(m_audioClock->GetPosition(&audioPosition, &audioTime)))
{
int64_t counterTime = llMulDiv(GetPerformanceCounter(), OneSecond, m_performanceFrequency, 0);
int64_t clockTime = llMulDiv(audioPosition, OneSecond, audioFrequency, 0) +
m_audioStart + (audioPosition > 0 ? m_audioOffset + counterTime - audioTime : 0);
*pAudioTime = clockTime;
if (pCounterTime)
*pCounterTime = counterTime;
return S_OK;
}
}
return E_FAIL;
}
HRESULT MyClock::GetAudioClockStartTime(REFERENCE_TIME* pStartTime)
{
CheckPointer(pStartTime, E_POINTER);
CAutoLock lock(this);
if (m_audioClock)
{
*pStartTime = m_audioStart;
return S_OK;
}
return E_FAIL;
}
}
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