smlelem.cpp

linux下的一款播放器

			// so that x.focusInEvent-5s would be used over
			// x.focusInEvent-3s if and only if (restart=="never"
			// OR (restart!="never" AND this's dur <=2s)):
			else if (lEffectiveResolvedToTime ==
				lResolvedToTimeOfTimeValFoundSoFar  &&
				lTimeOffset <
				pTimeValFoundSoFar->getTimeOffset())
			{
			    pTimeValFoundSoFar = pTmpVal;
			}
		    }
		}
		break;
	    }
	}
    	pWhichList->GetNext(lPos);
    } // /end while(lPos...).

    pValue = pTimeValFoundSoFar;

    if (NULL == pValue)
    {
	retval = HXR_FAILED;
    }

cleanup:
    return retval;
}

HX_RESULT
CSmilElement::resolveEventTimeValues(INT32 lCurTime,
				const char* pEventName,
				const char* pEventElementId,
				SmilTimingListType listType,
				REF(BOOL) bATimeWasResolved)
{
    HX_RESULT retval = HXR_OK;
    SmilTimeValue* pValue = NULL;
    CHXSimpleList* pWhichList = NULL;
    bATimeWasResolved = FALSE;
    LISTPOSITION lPos = NULL;

    if (NULL == pEventName  ||
	    // /pEventElementId can be NULL but not non-NULL and empty:
	    (pEventElementId  &&  '\0' == *pEventElementId) )
    {
	retval = HXR_FAILED;
	goto cleanup;
    }

    if (SmilBeginTimeList == listType) // /get begin time:
    {
	pWhichList = m_pBeginTimeList;
    }
    else if (SmilEndTimeList == listType)// /get end time:
    {
	pWhichList = m_pEndTimeList;
    }
    else
    {
	HX_ASSERT(SmilBeginTimeList == listType  ||
		SmilEndTimeList == listType);
    }
    if (NULL == pWhichList)
    {
	retval = HXR_FAILED;
	goto cleanup;
    }

    // /XXXEH- is there any reason we should start from tail instead?
    lPos = pWhichList->GetHeadPosition();

    if (NULL == lPos) // /list is empty.
    {
	retval = HXR_FAILED;
	goto cleanup;
    }

    while (lPos  &&  HXR_OK == retval)
    {
	pValue = (SmilTimeValue*)pWhichList->GetAt(lPos);

	// /If this begin or end time is a time event based on this event
	// from the element with pEventElementId, then we can (and do)
	// resolve it here:
	if(NULL!= pValue  &&  (SmilTimeEvent == pValue->m_type  ||
		(pValue->m_bTreatSyncArcAsEvent  &&
		pValue->isSyncBaseTimeVal()) ) )
	{
	    // /Now, see if we've got an element that is waiting for this
	    // event from the pEventElement:
	    if (!pValue->getIdRef()  ||  !pValue->getEventName())
	    {
		HX_ASSERT(pValue->getIdRef()  && pValue->getEventName());
		pWhichList->GetNext(lPos);
		continue;
	    }
	    if ((!pEventElementId  ||  strcmp(pValue->getIdRef(),
		    pEventElementId) == 0)  &&
		    strcmp(pValue->getEventName(), pEventName) == 0 )
	    {
		BOOL bIsResolvedAlready = pValue->isTimeResolved();
		INT32 lProirResolvedToTime = (bIsResolvedAlready?
			pValue->getResolvedToTimeWithoutOffset():-1);
		pValue->setIsTimeResolved(TRUE);
		pValue->setResolvedToTime(lCurTime);
		pValue->setWhenTimeWasResolved(lCurTime);
		// /[Optimization]: In case we get called twice with the
		// same event at the same resolved time, let's not force
		// a stop/start of the element:
		if (!bIsResolvedAlready  ||  lCurTime !=lProirResolvedToTime)
		{
		    bATimeWasResolved = TRUE;
		}
	    }
	}
    	pWhichList->GetNext(lPos);
    } // /end while(lPos...).

cleanup:
    return retval;
}


// /This method goes through the m_pEndTimeList to see if there's an
// event-arc end time or other unresolved end time; this is important
// for use in the algorithm for determining whether or not something
// should restart (see SMIL 2.0 Spec Timing Module's getNextInterval()
// pseudocode):
BOOL
CSmilElement::hasUnresolvedEndTime()
{
    BOOL bHasUnresolvedEndTime = FALSE;

    SmilTimeValue* pValue = NULL;
    LISTPOSITION lPos = NULL;

    if (NULL == m_pEndTimeList)
    {
	goto cleanup;
    }

    // /XXXEH- is there any reason we should start from tail instead?
    lPos = m_pEndTimeList->GetHeadPosition();

    if (NULL == lPos) // /list is empty.
    {
	goto cleanup;
    }

    while (lPos  &&  !bHasUnresolvedEndTime)
    {
	pValue = (SmilTimeValue*)m_pEndTimeList->GetAt(lPos);

	if(NULL == pValue)
	{
	    m_pEndTimeList->GetNext(lPos);
	    continue;
	}
	if (SmilTimeEvent == pValue->m_type)
	{
	    bHasUnresolvedEndTime = TRUE;
	}
	// /XXXEH- TODO: need to go through sync-arc element and see
	// if *it* has any unresolved time(s) (begin or end, depending
	// on this sync-arc time's position value) and, if not, then
	// DON'T claim bHasUnresolvedEndTime is TRUE:
	else if (pValue->m_bTreatSyncArcAsEvent  &&
		pValue->isSyncBaseTimeVal())
	{
	    if (!pValue->isTimeResolved())
	    {
		bHasUnresolvedEndTime = TRUE;
	    }
	}
    	m_pEndTimeList->GetNext(lPos);
    } // /end while(lPos...).

cleanup:
    return bHasUnresolvedEndTime;
}



// /This method returns the pure duration from the media's begin to its
// end, w/o any delay included:
ULONG32
CSmilElement::getPureDuration()
{
    HX_ASSERT(!m_bDurationIncludesDelayBeyondSyncbase  ||
	    m_bCurBeginIsOffsetFromSyncBase);
    if (m_bDurationIncludesDelayBeyondSyncbase)
    {
	return (m_ulDuration - m_ulBeginOffsetFromSyncBase);
    }
    else
    {
	return m_ulDuration;
    }
/*
    return (m_bDurationIncludesDelayBeyondSyncbase?
	    m_ulDuration-m_ulBeginOffsetFromSyncBase : m_ulDuration);
*/
}


HX_RESULT
CSmilElement::resolveSyncArcTimeValues(INT32 lResolvedToTime,
				const char* pSyncBaseElementId,
				SmilTimingListType listType,
				REF(BOOL) bATimeWasResolved,
				BOOL bMoveNewlyResolvedsToPendingTimesList,
				CSmilParser* pParser)
{
    HX_RESULT retval = HXR_OK;
    SmilTimeValue* pValue = NULL;
    CHXSimpleList* pWhichList = NULL;
    bATimeWasResolved = FALSE;
    LISTPOSITION lPos = NULL;

    if (NULL == pSyncBaseElementId)
    {
	retval = HXR_FAILED;
	goto cleanup;
    }

    if (SmilBeginTimeList == listType) // /get begin time:
    {
	pWhichList = m_pBeginTimeList;
    }
    else if (SmilEndTimeList == listType)// /get end time:
    {
	pWhichList = m_pEndTimeList;
    }

    else
    {
	HX_ASSERT(SmilBeginTimeList == listType  ||
		SmilEndTimeList == listType);
    }
    if (NULL == pWhichList)
    {
	retval = HXR_FAILED;
	goto cleanup;
    }

    // /XXXEH- is there any reason we should start from tail instead?
    lPos = pWhichList->GetHeadPosition();

    if (NULL == lPos) // /list is empty.
    {
	retval = HXR_FAILED;
	goto cleanup;
    }

    while (lPos  &&  HXR_OK == retval)
    {
	pValue = (SmilTimeValue*)pWhichList->GetAt(lPos);

	// /If this begin or end time is a time event based on this event
	// from the element with pSyncBaseElementId, then we can (and do)
	// resolve it here:
	if(NULL!= pValue  &&  pValue->isSyncBaseTimeVal())
	{
	    // /Now, see if we've got an element that is waiting for this
	    // event from the pEventElement:
	    if (!pValue->getIdRef())
	    {
		HX_ASSERT(pValue->getIdRef());
    		pWhichList->GetNext(lPos);
		continue;
	    }
	    if (strcmp(pValue->getIdRef(), pSyncBaseElementId) == 0)
	    {
		// /Helps fix SMIL 2.0 Interop Timing #15.13:
		// if we're resuming a paused element and its duration thus
		// got extended, don't re-resolve (and re-insert) other
		// elements who are sync-arc'd to the *begin* time of this
		// resumed element:
		if (pValue->isTimeResolved()  &&  lResolvedToTime ==
			pValue->getResolvedToTimeWithoutOffset()  &&
			SmilBeginTimeList == listType)
		{
		    bMoveNewlyResolvedsToPendingTimesList = FALSE;
		}

		pValue->setIsTimeResolved(TRUE);
		pValue->setResolvedToTime(lResolvedToTime);

		// /XXXEH- this shouldn't matter what we put here, but
		// we *should* fill this with the current time:
		pValue->setWhenTimeWasResolved(0);
		bATimeWasResolved = TRUE;

		if (pParser  &&  bMoveNewlyResolvedsToPendingTimesList)
		{
		    if (SmilBeginTimeList == listType)
		    {
			if (pParser->EstablishBeginTimeList())
			{
			    CHXSimpleList* pList =
				    pParser->GetPendingBeginTimeList();
			    // /Don't add if it's a duplicate:
			    if (!pParser->isDuplicateEntry(pList, pValue))
			    {
				pList->AddTail(pValue);
			    }
			}
		    }
		    else
		    {
			if (pParser->EstablishEndTimeList())
			{
			    CHXSimpleList* pList =
				    pParser->GetPendingEndTimeList();
			    // /Don't add if it's a duplicate:
			    if (!pParser->isDuplicateEntry(pList, pValue))
			    {
				pList->AddTail(pValue);
			    }
			}
		    }
		}
	    }
	}
    	pWhichList->GetNext(lPos);
    } // /end while(lPos...).

cleanup:
    return retval;
}

// /Returns HXR_FAILED if element or its parent don't exist.  The spec says
// that "always" is what is to be used for restart and restartDefault for the
// element if it has no parent or the parent has no restartDefault value:
HX_RESULT
CSmilElement::getParentRestartDefault()
{
    HX_RESULT ret = HXR_OK;
    if (NULL == m_pNode)
    {
	ret = HXR_FAILED;
    }
    else
    {
	SMILNode* pParent = m_pNode->m_pParent;
	if (!pParent  ||  !pParent->m_pElement)
	{
	    ret = HXR_FAILED;
	}
	else
	{
	    switch (pParent->m_pElement->m_restartDefaultBehavior)
	    {
		case SmilRestartNever:
		case SmilRestartWhenNotActive:
		case SmilRestartAlways:
		    // /Both restartDefault and restart behavior are assigned
		    // to parent's restartDefault behavior:
		    m_restartDefaultBehavior =
			    m_restartBehavior =
			    pParent->m_pElement->m_restartDefaultBehavior;
		    break;

		case SmilRestartInherit:
		    m_restartDefaultBehavior =
			    m_restartBehavior = SmilRestartAlways;
		    break;

		default:
		    HX_ASSERT(0);
		    break;
	    }
	}
    }

    return ret;
}

void CSmilElement::updateRemoveTime(UINT32 ulRemoveTime)
{
    m_ulRemoveTime = ulRemoveTime;
    if (m_pHandler)
    {
        m_pHandler->handleRemoveTimeUpdate(this, ulRemoveTime);
    }
}

void CSmilElement::handleXMMF(const char* pszID, const char* pszXMMFile, const char* pszSrc)
{
    if (m_pHandler)
    {
        m_pHandler->handleExternalMediaMarkerFile(this,
                                                  pszID,
                                                  pszXMMFile,
                                                  pszSrc);
    }
}

BOOL CSmilElement::hasEventBasedBeginTime()
{
    BOOL bRet = FALSE;

    if (m_pBeginTimeList)
    {
        LISTPOSITION pos = m_pBeginTimeList->GetHeadPosition();
        while (pos)
        {
            SmilTimeValue* pValue =
                (SmilTimeValue*) m_pBeginTimeList->GetNext(pos);
            if (pValue &&
                pValue->m_type == SmilTimeEvent)
            {
                bRet = TRUE;
                break;
            }
        }
    }
    // We also have to check our sync ancestor because
    // if our sync ancestor has an event based begin
    // time, then so do we. However, if we already
    // know we have an event based time, then we don't
    // need to check
    if (!bRet)
    {
        CSmilElement* pSyncAnc = getSyncAncestorElement();
        if (pSyncAnc)
        {
            bRet = pSyncAnc->hasEventBasedBeginTime();
        }
    }

    return bRet;
}

CSmilElement* CSmilElement::getSyncAncestorElement()
{
    CSmilElement* pRet = NULL;

    if (m_pNode)
    {
        BOOL bLegalMediaObjectChild = FALSE;
        if (m_pNode->m_tag == SMILArea         ||
            m_pNode->m_tag == SMILAnchor       ||
            m_pNode->m_tag == SMILAnimate      ||
            m_pNode->m_tag == SMILSet          ||
            m_pNode->m_tag == SMILAnimateColor ||
            m_pNode->m_tag == SMILAnimateMotion)
        {
            bLegalMediaObjectChild = TRUE;
        }
        SMILNode* pAnc = m_pNode->m_pParent;
        while (pAnc)
        {
            if (pAnc->m_tag == SMILPar  ||
                pAnc->m_tag == SMILExcl ||
                pAnc->m_tag == SMILSeq)
            {
                pRet = pAnc->m_pElement;
                break;
            }
            else if ((pAnc->m_tag == SMILRef        ||
                      pAnc->m_tag == SMILText       ||
                      pAnc->m_tag == SMILImg        ||
                      pAnc->m_tag == SMILAudio      ||
                      pAnc->m_tag == SMILVideo      ||