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/****************************************************************************
* *
* PrimeSense Sensor 5.x Alpha *
* Copyright (C) 2011 PrimeSense Ltd. *
* *
* This file is part of PrimeSense Sensor. *
* *
* PrimeSense Sensor is free software: you can redistribute it and/or modify*
* it under the terms of the GNU Lesser General Public License as published *
* by the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* PrimeSense Sensor is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with PrimeSense Sensor. If not, see <http://www.gnu.org/licenses/>.*
* *
****************************************************************************/
//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include "XnFrameBufferManager.h"
#include <XnLog.h>
#include <XnDDK.h>
//---------------------------------------------------------------------------
// Code
//---------------------------------------------------------------------------
XnFrameBufferManager::XnFrameBufferManager(XnBufferPool* pBufferPool) :
m_pBufferPool(pBufferPool),
m_pWorkingBuffer(NULL),
m_pStableBuffer(NULL),
m_nStableFrameID(0),
m_nStableTimestamp(0),
m_hLock(NULL)
{
}
XnFrameBufferManager::~XnFrameBufferManager()
{
Free();
}
XnStatus XnFrameBufferManager::Init(XnUInt32 nBufferSize)
{
XnStatus nRetVal = XN_STATUS_OK;
nRetVal = xnOSCreateCriticalSection(&m_hLock);
XN_IS_STATUS_OK(nRetVal);
nRetVal = m_pBufferPool->Init(nBufferSize);
XN_IS_STATUS_OK(nRetVal);
nRetVal = Reallocate(nBufferSize);
XN_IS_STATUS_OK(nRetVal);
return (XN_STATUS_OK);
}
void XnFrameBufferManager::Free()
{
if (m_hLock != NULL)
{
xnOSCloseCriticalSection(&m_hLock);
m_hLock = NULL;
}
}
XnStatus XnFrameBufferManager::Reallocate(XnUInt32 nBufferSize)
{
XnStatus nRetVal = XN_STATUS_OK;
xnOSEnterCriticalSection(&m_hLock);
nRetVal = m_pBufferPool->ChangeBufferSize(nBufferSize);
if (nRetVal != XN_STATUS_OK)
{
xnOSLeaveCriticalSection(&m_hLock);
return (nRetVal);
}
// release current ones
if (m_pWorkingBuffer != NULL)
{
m_pBufferPool->DecRef(m_pWorkingBuffer);
}
if (m_pStableBuffer != NULL)
{
m_pBufferPool->DecRef(m_pStableBuffer);
}
// and take one
if (nBufferSize == 0)
{
m_pWorkingBuffer = NULL;
m_pStableBuffer = NULL;
}
else
{
// take working buffer
nRetVal = m_pBufferPool->GetBuffer(&m_pWorkingBuffer);
XN_IS_STATUS_OK(nRetVal);
}
xnOSLeaveCriticalSection(&m_hLock);
return (XN_STATUS_OK);
}
void XnFrameBufferManager::MarkWriteBufferAsStable(XnUInt64 nTimestamp, XnUInt32* pnFrameID)
{
xnOSEnterCriticalSection(&m_hLock);
// lock buffer pool (for rollback option)
m_pBufferPool->Lock();
XnBuffer* pPrevStable = m_pStableBuffer;
// release previous stable
if (m_pStableBuffer != NULL)
{
m_pBufferPool->DecRef(m_pStableBuffer);
}
// mark working as stable
m_nStableFrameID++;
m_nStableTimestamp = nTimestamp;
*pnFrameID = m_nStableFrameID;
m_pStableBuffer = m_pWorkingBuffer; // no need to add ref, working buffer will be replaced in a moment
// take a new working buffer
XnStatus nRetVal = m_pBufferPool->GetBuffer(&m_pWorkingBuffer);
if (nRetVal != XN_STATUS_OK)
{
xnLogError(XN_MASK_DDK, "Failed to get new working buffer!");
// we'll return back to our old working one
m_pWorkingBuffer->Reset();
m_pStableBuffer = pPrevStable;
m_pBufferPool->AddRef(m_pStableBuffer);
m_pBufferPool->Unlock();
return;
}
m_pBufferPool->Unlock();
xnOSLeaveCriticalSection(&m_hLock);
// reset new working
m_pWorkingBuffer->Reset();
// notify stream that new data is available
m_NewFrameEvent.Raise(this, m_nStableTimestamp);
}
void XnFrameBufferManager::ReadLastStableBuffer(XnBuffer** ppBuffer, XnUInt64* pnTimestamp, XnUInt32* pnFrameID)
{
xnOSEnterCriticalSection(&m_hLock);
// take a pointer to stable one
*ppBuffer = m_pStableBuffer;
// and add ref to it (so it wouldn't be deleted)
if (m_pStableBuffer != NULL)
{
m_pBufferPool->AddRef(m_pStableBuffer);
}
// take props
*pnTimestamp = m_nStableTimestamp;
*pnFrameID = m_nStableFrameID;
xnOSLeaveCriticalSection(&m_hLock);
}
XnStatus XnFrameBufferManager::CopyLastStableBuffer(void* pDest, XnUInt32 nDestSize, XnUInt32* pnWritten)
{
// do this inside a lock (so we won't erase memory during copy)
xnOSEnterCriticalSection(&m_hLock);
// check size
if (nDestSize < m_pStableBuffer->GetSize())
{
xnOSLeaveCriticalSection(&m_hLock);
return (XN_STATUS_OUTPUT_BUFFER_OVERFLOW);
}
// copy
m_pStableBuffer->UnsafeCopy(pDest);
*pnWritten = m_pStableBuffer->GetSize();
xnOSLeaveCriticalSection(&m_hLock);
return XN_STATUS_OK;
}
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