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/*****************************************************************************
* *
* OpenNI 2.x Alpha *
* Copyright (C) 2012 PrimeSense Ltd. *
* *
* This file is part of OpenNI. *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); *
* you may not use this file except in compliance with the License. *
* You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* *
*****************************************************************************/
//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include "XnFrameBufferManager.h"
#include <XnLog.h>
#include <XnDDK.h>
//---------------------------------------------------------------------------
// Code
//---------------------------------------------------------------------------
XnFrameBufferManager::XnFrameBufferManager() :
m_pServices(NULL),
m_pWorkingBuffer(NULL),
m_nStableFrameID(0),
m_newFrameCallback(NULL),
m_newFrameCallbackCookie(NULL),
m_hLock(NULL)
{
}
XnFrameBufferManager::~XnFrameBufferManager()
{
Free();
}
void XnFrameBufferManager::SetNewFrameCallback(NewFrameCallback func, void* pCookie)
{
m_newFrameCallback = func;
m_newFrameCallbackCookie = pCookie;
}
XnStatus XnFrameBufferManager::Init()
{
XnStatus nRetVal = XN_STATUS_OK;
nRetVal = xnOSCreateCriticalSection(&m_hLock);
XN_IS_STATUS_OK(nRetVal);
return (XN_STATUS_OK);
}
void XnFrameBufferManager::Free()
{
Stop();
if (m_hLock != NULL)
{
xnOSCloseCriticalSection(&m_hLock);
m_hLock = NULL;
}
}
XnStatus XnFrameBufferManager::Start(oni::driver::StreamServices& services)
{
m_pServices = &services;
// take working buffer
m_pWorkingBuffer = m_pServices->acquireFrame();
if (m_pWorkingBuffer == NULL)
{
XN_ASSERT(FALSE);
return XN_STATUS_ERROR;
}
m_writeBuffer.SetExternalBuffer((XnUChar*)m_pWorkingBuffer->data, m_pWorkingBuffer->dataSize);
return (XN_STATUS_OK);
}
void XnFrameBufferManager::Stop()
{
if (m_pWorkingBuffer != NULL)
{
m_pServices->releaseFrame(m_pWorkingBuffer);
m_pWorkingBuffer = NULL;
}
m_pServices = NULL;
}
void XnFrameBufferManager::MarkWriteBufferAsStable(XnUInt32* pnFrameID)
{
xnOSEnterCriticalSection(&m_hLock);
OniFrame* pStableBuffer = m_pWorkingBuffer;
pStableBuffer->dataSize = m_writeBuffer.GetSize();
// mark working as stable
m_nStableFrameID++;
*pnFrameID = m_nStableFrameID;
pStableBuffer->frameIndex = m_nStableFrameID;
// take a new working buffer
m_pWorkingBuffer = m_pServices->acquireFrame();
if (m_pWorkingBuffer == NULL)
{
xnLogError(XN_MASK_DDK, "Failed to get new working buffer!");
// we'll return back to our old working one
m_pWorkingBuffer = pStableBuffer;
m_pWorkingBuffer->dataSize = 0;
XN_ASSERT(FALSE);
return;
}
m_writeBuffer.SetExternalBuffer((XnUChar*)m_pWorkingBuffer->data, m_pWorkingBuffer->dataSize);
xnOSLeaveCriticalSection(&m_hLock);
// reset new working
m_pWorkingBuffer->dataSize = 0;
// notify stream that new data is available
if (m_newFrameCallback != NULL)
{
m_newFrameCallback(pStableBuffer, m_newFrameCallbackCookie);
}
// and release our reference
m_pServices->releaseFrame(pStableBuffer);
}
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