vdclback.cpp
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上传日期:2007-06-06
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文件大小:8k
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- /*
- * Class Implementation for CQTVideoRenderer::CVideoSchedulerCallback
- */
- #include "hxtypes.h"
- #include "hxwintyp.h"
- #include "hxresult.h"
- #include "hxcom.h"
- #include "hxevent.h"
- #include "hxcomm.h"
- #include "hxengin.h"
- #include "hxerror.h"
- #include "hxtick.h"
- #include "hxassert.h"
- #include "timeval.h"
- #include "vdclback.h"
- CVideoSchedulerCallback::CVideoSchedulerCallback
- (
- FP_CALLBACK pFunc,
- void* cookie,
- IUnknown* pIUnknown,
- BOOL bUseOptimizedScheduler
- )
- : m_lRefCount(0)
- , m_pScheduler(NULL)
- , m_pFunc(pFunc)
- , m_pOptimizedScheduler(NULL)
- , m_bPendingCallback(FALSE)
- , m_bInCallback(FALSE)
- , m_PendingHandle(0)
- , m_bIsInterruptSafe(bUseOptimizedScheduler)
- , m_cookie(cookie)
- {
- if (bUseOptimizedScheduler)
- {
- if (HXR_OK != pIUnknown->QueryInterface(IID_IHXOptimizedScheduler,
- (void **) &m_pOptimizedScheduler))
- {
- // just for good luck
- m_pOptimizedScheduler = NULL;
- }
- }
- if (m_pOptimizedScheduler == NULL)
- {
- if (HXR_OK != pIUnknown->QueryInterface(IID_IHXScheduler,
- (void **) &m_pScheduler))
- {
- m_pScheduler = NULL;
- }
- }
- }
- STDMETHODIMP
- CVideoSchedulerCallback::Close()
- {
- // the optimized scheduler has presidence so we check it first
- if (m_bPendingCallback && m_pOptimizedScheduler)
- {
- m_pOptimizedScheduler->Remove(m_PendingHandle);
- m_bPendingCallback = FALSE;
- m_PendingHandle = 0;
- }
- HX_RELEASE(m_pOptimizedScheduler);
- if (m_bPendingCallback && m_pScheduler)
- {
- m_pScheduler->Remove(m_PendingHandle);
- m_bPendingCallback = FALSE;
- m_PendingHandle = 0;
- }
- HX_RELEASE(m_pScheduler);
- return HXR_OK;
- }
- CVideoSchedulerCallback::~CVideoSchedulerCallback()
- {
- Close();
- }
- STDMETHODIMP
- CVideoSchedulerCallback::ScheduleCallback
- (
- UINT32 ulRelativeTime,
- UINT32 ulTicksTime
- )
- {
- // this new callback is going to take presidence over the
- // current one so remove it.
- if (m_pOptimizedScheduler != NULL || m_pScheduler != NULL)
- {
- IHXCallback* pCallback = NULL;
- if (HXR_OK == QueryInterface(IID_IHXCallback, (void**)&pCallback))
- {
- HXTimeval lTime;
- // Always use the optimized scheduler if we have one
- if (m_pOptimizedScheduler != NULL)
- {
- lTime = m_pOptimizedScheduler->GetCurrentSchedulerTime();
- }
- else
- {
- lTime = m_pScheduler->GetCurrentSchedulerTime();
- }
- UINT32 ulCurrentTime = HX_GET_BETTERTICKCOUNT();
- // if ulTicksTime is in the future, add the difference to lTime,
- // if it's in the past, don't add anything to lTime so we schedule
- // an imediate callback.
- if (ulCurrentTime < ulTicksTime)
- {
- UINT32 ulTimeDiff = CALCULATE_ELAPSED_TICKS(ulCurrentTime,
- ulTicksTime);
- lTime.tv_usec += ulTimeDiff * MILLISECOND;
- if (lTime.tv_usec >= SECOND)
- {
- lTime.tv_sec += lTime.tv_usec / SECOND;
- lTime.tv_usec %= SECOND;
- }
- }
-
- // we want to do the right thing here and remove a callback before we schedule a new one
- // but we should never do that.
- HX_ASSERT(!m_bPendingCallback);
- if (m_bPendingCallback)
- {
- // Always use the optimized scheduler if we have one
- if (m_pOptimizedScheduler != NULL)
- {
- m_pOptimizedScheduler->Remove(m_PendingHandle);
- }
- else if (m_pScheduler)
- {
- m_pScheduler->Remove(m_PendingHandle);
- }
- }
-
- m_bPendingCallback = TRUE;
- // Always use the optimized scheduler if we have one
- if (m_pOptimizedScheduler != NULL)
- {
- m_PendingHandle = m_pOptimizedScheduler->AbsoluteEnter(pCallback, lTime);
- }
- else
- {
- m_PendingHandle = m_pScheduler->AbsoluteEnter(pCallback, lTime);
- }
- }
- HX_RELEASE(pCallback);
- }
- return HXR_OK;
- }
- STDMETHODIMP
- CVideoSchedulerCallback::Func(void)
- {
- m_bInCallback = TRUE;
- if (m_pFunc != NULL )
- {
- HX_ASSERT(m_bPendingCallback);
-
- HXTimeval lTime;
- // Always use the optimized scheduler if we have one
- if (m_pOptimizedScheduler != NULL)
- {
- lTime = m_pOptimizedScheduler->GetCurrentSchedulerTime();
- }
- else
- {
- lTime = m_pScheduler->GetCurrentSchedulerTime();
- }
- m_PendingHandle = 0;
- m_bPendingCallback = FALSE;
- m_pFunc(m_cookie);
- }
- m_bInCallback = FALSE;
- return HXR_OK;
- }
- STDMETHODIMP_(BOOL)
- CVideoSchedulerCallback::ShouldKickStartScheduler()
- {
- return !(m_bPendingCallback || (!m_bPendingCallback && m_bInCallback));
- }
- /////////////////////////////////////////////////////////////////////////
- // Method:
- // IUnknown::QueryInterface
- // Purpose:
- // Implement this to export the interfaces supported by your
- // object.
- //
- STDMETHODIMP
- CVideoSchedulerCallback::QueryInterface
- (
- REFIID riid,
- void** ppvObj
- )
- {
- if (IsEqualIID(riid, IID_IUnknown))
- {
- AddRef();
- *ppvObj = this;
- return HXR_OK;
- }
- else if (IsEqualIID(riid, IID_IHXCallback))
- {
- AddRef();
- *ppvObj = (IHXCallback*)this;
- return HXR_OK;
- }
- else if (IsEqualIID(riid, IID_IHXInterruptSafe))
- {
- AddRef();
- *ppvObj = (IHXInterruptSafe*)this;
- return HXR_OK;
- }
- *ppvObj = NULL;
- return HXR_NOINTERFACE;
- }
- /////////////////////////////////////////////////////////////////////////
- // Method:
- // IUnknown::AddRef
- // Purpose:
- // Everyone usually implements this the same... feel free to use
- // this implementation.
- //
- STDMETHODIMP_(ULONG32)
- CVideoSchedulerCallback::AddRef()
- {
- return InterlockedIncrement(&m_lRefCount);
- }
- /////////////////////////////////////////////////////////////////////////
- // Method:
- // IUnknown::Release
- // Purpose:
- // Everyone usually implements this the same... feel free to use
- // this implementation.
- //
- STDMETHODIMP_(ULONG32)
- CVideoSchedulerCallback::Release()
- {
- if (InterlockedDecrement(&m_lRefCount) > 0)
- {
- return m_lRefCount;
- }
- delete this;
- return 0;
- }
- STDMETHODIMP_(BOOL)
- CVideoSchedulerCallback::IsInterruptSafe()
- {
- return m_bIsInterruptSafe;
- }