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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 "XnStreamReaderStream.h"
#include "XnStreamDataInternal.h"

//---------------------------------------------------------------------------
// Code
//---------------------------------------------------------------------------
XnStreamReaderStream::XnStreamReaderStream(const XnChar* strType, const XnChar* strName) :
XnDeviceStream(strType, strName),
m_pLastData(NULL),
m_nLastFrameIDFromStream(0)
{}

XnStreamReaderStream::~XnStreamReaderStream()
{
XnStreamReaderStream::Free();
}

XnStatus XnStreamReaderStream::Init()
{
XnStatus nRetVal = XN_STATUS_OK;

nRetVal = XnDeviceStream::Init();
XN_IS_STATUS_OK(nRetVal);

// register for size change (so we can realloc stream data)
XnCallbackHandle hCallback;
nRetVal = RequiredSizeProperty().OnChangeEvent().Register(RequiredSizeChangedCallback, this, hCallback);
XN_IS_STATUS_OK(nRetVal);

// and create stream data
nRetVal = XnStreamDataCreate(&m_pLastData, GetName(), GetRequiredDataSize());
XN_IS_STATUS_OK(nRetVal);

return (XN_STATUS_OK);
}

XnStatus XnStreamReaderStream::Free()
{
if (m_pLastData != NULL)
{
XnStreamDataDestroy(&m_pLastData);
m_pLastData = NULL;
}

return (XN_STATUS_OK);
}

XnStatus XnStreamReaderStream::ReadImpl(XnStreamData* pStreamData)
{
pStreamData->nFrameID = m_pLastData->nFrameID;
pStreamData->nTimestamp = m_pLastData->nTimestamp;

if (pStreamData->pInternal->bAllocated)
{
// don't take more than required size
pStreamData->nDataSize = XN_MIN(m_pLastData->nDataSize, GetRequiredDataSize());
xnOSMemCopy(pStreamData->pData, m_pLastData->pData, pStreamData->nDataSize);
}
else
{
pStreamData->nDataSize = m_pLastData->nDataSize;
pStreamData->pData = m_pLastData->pData;
}

return (XN_STATUS_OK);
}

XnStatus XnStreamReaderStream::CalcRequiredSize(XnUInt32* pnRequiredSize) const
{
// we use the same size we have now
*pnRequiredSize = GetRequiredDataSize();
return XN_STATUS_OK;
}

void XnStreamReaderStream::NewDataAvailable(XnUInt64 nTimestamp, XnUInt32 /*nFrameID*/)
{
m_pLastData->nTimestamp = nTimestamp;
m_pLastData->nFrameID = ++m_nLastFrameIDFromStream;
XnDeviceStream::NewDataAvailable(m_pLastData->nTimestamp, m_pLastData->nFrameID);
}

void XnStreamReaderStream::ReMarkDataAsNew()
{
XnDeviceStream::NewDataAvailable(m_pLastData->nTimestamp, m_pLastData->nFrameID);
}

void XnStreamReaderStream::Reset()
{
m_nLastFrameIDFromStream = 0;
xnOSMemSet(m_pLastData->pData, 0, m_pLastData->pInternal->nAllocSize);
m_pLastData->nDataSize = 0;
m_pLastData->nFrameID = 0;
m_pLastData->nTimestamp = 0;
m_pLastData->bIsNew = FALSE;
XnDeviceStream::ResetLastTimestampAndFrameID();
}

XnStatus XnStreamReaderStream::OnRequiredSizeChanged()
{
XnStatus nRetVal = XN_STATUS_OK;

nRetVal = XnStreamDataUpdateSize(m_pLastData, GetRequiredDataSize());
XN_IS_STATUS_OK(nRetVal);

return (XN_STATUS_OK);
}

XnStatus XnStreamReaderStream::RequiredSizeChangedCallback(const XnProperty* /*pSender*/, void* pCookie)
{
XnStreamReaderStream* pThis = (XnStreamReaderStream*)pCookie;
return pThis->OnRequiredSizeChanged();
}
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