smppkfdr.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** 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 ***** */ 

/****************************************************************************
 *  Includes
 */
#include "raformat.h"

#include "smppkfdr.h"


/****************************************************************************
 *  Defines
 */


/****************************************************************************
 *  CRealAudioSimplePacketFeeder
 */
/****************************************************************************
 *  Constructor & Destructor
 */
CRealAudioSimplePacketFeeder::CRealAudioSimplePacketFeeder
(
    CStreamParam& refStreamParam,
    CInterleaveBufs& refIBufs,
    UINT16* pRuleToFlagMap,
    UINT16 uStreamNumber
)
    : m_StreamParam(refStreamParam)
    , m_IBufs(refIBufs)
    , m_pRuleToFlagMap(pRuleToFlagMap)
    , m_pPendingPacketQueue(NULL)
    , m_ulContinueDiscardUntilTime(NO_TIME_SET)
    , m_ulSequence(0)
    , m_uStreamNumber(uStreamNumber)
    , m_bEndOfPackets(FALSE)
    , m_ulLastPacketTime(NO_TIME_SET)
{
    m_pPendingPacketQueue = new CHXSimpleList;
}

CRealAudioSimplePacketFeeder::~CRealAudioSimplePacketFeeder(void)
{
    _Reset();

    HX_DELETE(m_pPendingPacketQueue);
}


/****************************************************************************
 *  Interface methods
 */
HX_RESULT CRealAudioSimplePacketFeeder::OnPacket(IHXPacket* pPacket, 
						   LONG32 lTimeOffset, 
						   UINT16* rule_to_flag_map)
{
    HX_RESULT retVal = HXR_OK;

    if (m_ulContinueDiscardUntilTime != NO_TIME_SET)
    {
	// when we find the superblock that contins the discard until time
	// we are done and should start putting packets into the queue again
	if (pPacket &&
	    (!pPacket->IsLost()))
	{
	    if (IsTimeGreater(pPacket->GetTime() + GetSuperBlockTime(),
			      m_ulContinueDiscardUntilTime) &&
		((rule_to_flag_map == NULL) ||
		 (rule_to_flag_map[pPacket->GetASMRuleNumber()] & HX_KEYFRAME_FLAG)))
	    {
		m_ulContinueDiscardUntilTime = NO_TIME_SET;
	    }
	}

	if (m_ulContinueDiscardUntilTime != NO_TIME_SET)
	{
	    // Discard this packet
	    pPacket = NULL;
	}
    }

    if (pPacket)
    {
	if (!pPacket->IsLost())
	{
	    m_ulLastPacketTime = pPacket->GetTime();
	}
	m_pPendingPacketQueue->AddTail(pPacket);
	pPacket->AddRef();
    }

    // fill up the interleave buffer from the packet queue
    FillISuperBlock();
    
    return retVal;
}

void CRealAudioSimplePacketFeeder::LossOccured(void)
{
    ;
}

void CRealAudioSimplePacketFeeder::Reset(void)
{
    _Reset();
}

void CRealAudioSimplePacketFeeder::OnEndOfPackets(void)
{
    m_bEndOfPackets = TRUE;
}

BOOL CRealAudioSimplePacketFeeder::IsActive(void)
{
    BOOL bRetVal = (!m_pPendingPacketQueue->IsEmpty());

    return bRetVal;
}

BOOL
CRealAudioSimplePacketFeeder::FillISuperBlock(void)
{    
    BOOL bIsLost;
    UINT16 usFlag;
    UINT32 ulDataSize;
    UINT8* pPacketData;
    IHXBuffer* pPacketBuffer;
    IHXPacket* pPacket;
    HX_RESULT status;

    while ((!m_IBufs.IsISuperBlockDone()) &&
	   (!m_pPendingPacketQueue->IsEmpty()))
    {
	pPacket = (IHXPacket*) m_pPendingPacketQueue->RemoveHead();
	pPacketBuffer = pPacket->GetBuffer();

	bIsLost = TRUE;
	ulDataSize = 0;
	pPacketData = NULL;
	usFlag = 0;

	if ((!pPacket->IsLost()) && pPacketBuffer)
	{
	    bIsLost = FALSE;
	    ulDataSize = pPacketBuffer->GetSize();
	    pPacketData = pPacketBuffer->GetBuffer();
	    if (m_pRuleToFlagMap)
	    {
		usFlag = m_pRuleToFlagMap[pPacket->GetASMRuleNumber()];
	    }
	}

	status = m_IBufs.OnPacket(pPacketData,
				  ulDataSize,
				  m_ulSequence,
				  pPacket->GetTime(),
				  bIsLost,
				  usFlag);

	if (SUCCEEDED(status))
	{
	    m_ulSequence++;
	}
	else
	{
	    if (m_IBufs.IsISuperBlockDone())
	    {
		m_pPendingPacketQueue->AddHead(pPacket);
		pPacket = NULL;
		pPacketBuffer = NULL;
	    }
	    else
	    {
		// Packet was rejected and did not accomplish completion
		// of a super-block.  Throw it away.
		m_ulSequence++;
	    }
	}

	HX_RELEASE(pPacketBuffer);
	HX_RELEASE(pPacket);
    }

    return m_IBufs.IsISuperBlockFilled();
}

BOOL
CRealAudioSimplePacketFeeder::IsCurrentTimeRangeEnded(void)
{
    BOOL bTimeRangeEnded = m_bEndOfPackets;

    return bTimeRangeEnded;
}

BOOL
CRealAudioSimplePacketFeeder::IsCurrentTimeRangeEmpty(void)
{
    BOOL bTimeRangeEmpty = m_pPendingPacketQueue->IsEmpty();

    return bTimeRangeEmpty;
}

UINT32
CRealAudioSimplePacketFeeder::GetCurrentTimeRangeEnd(void)
{
    UINT32 ulPacketEndTime = m_ulLastPacketTime + ((UINT32) GetMSPerBlock());
    UINT32 ulBufferEndTime = m_IBufs.m_IBlockTimeRange.m_ulEnd;

    UINT32 ulRet = (((ulBufferEndTime != NO_TIME_SET) && 
		     IsTimeGreater(ulBufferEndTime, ulPacketEndTime)) ? 
		    ulBufferEndTime : ulPacketEndTime);
				 
    return ulRet;
}

BOOL
CRealAudioSimplePacketFeeder::SetCrossFadeEndTime(UINT32 ulTimestamp)
{
    // move data forward if we can
    FillISuperBlock();

    return Discard(ulTimestamp, FALSE);	// Discard after time
}

BOOL
CRealAudioSimplePacketFeeder::Discard(UINT32 ulTimestamp, BOOL bBefore)
{
    IHXPacket* pPacket;
    BOOL bDone = FALSE;
    BOOL bDiscard = FALSE;

    if (!m_pPendingPacketQueue->IsEmpty())
    {
	// Remove from the unregistration queue if in there
	LISTPOSITION currentPosition = NULL;
	LISTPOSITION nextPosition = m_pPendingPacketQueue->GetHeadPosition();
	
	do
	{
	    currentPosition = nextPosition;
	    pPacket = (IHXPacket*) m_pPendingPacketQueue->GetNext(nextPosition);
	    
	    if ((!bDiscard && !bBefore) || (bDiscard && bBefore))
	    {
		if (!pPacket->IsLost())
		{
		    if (bBefore)
		    {
			bDiscard = IsTimeLess(pPacket->GetTime(), ulTimestamp);
		    }
		    else
		    {
			bDiscard = IsTimeGreaterOrEqual(pPacket->GetTime(), ulTimestamp);
		    }

		    if (!bDone)
		    {
			// We are done if packets exist preceeding the discard point
			bDone = (!bDiscard);
		    }
		}
	    }

	    if (bDiscard)
	    {
		m_pPendingPacketQueue->RemoveAt(currentPosition);
		HX_RELEASE(pPacket);
	    }
	} while (nextPosition);
    }

    return bDone;
}

BOOL
CRealAudioSimplePacketFeeder::DiscardTillEndOfCrossFade(UINT32 ulTimestamp,
							BOOL bHandled)
{
    m_ulContinueDiscardUntilTime = NO_TIME_SET;

    if (!bHandled)
    {
	bHandled = Discard(ulTimestamp, TRUE);  // Discard before time
    }

    // if still not done, continue discard until done
    if (!bHandled)
    {
	// this means we have to watch packets coming into the format
	// and toss out blocks for superblocks that are earlier than
	// this time
	m_ulContinueDiscardUntilTime = ulTimestamp;
    }

    return bHandled;
}

HX_RESULT 
CRealAudioSimplePacketFeeder::SetupForNextTimeRange(void)
{
    m_ulContinueDiscardUntilTime = NO_TIME_SET;

    return HXR_OK;
}

/****************************************************************************
 *  Protected methods
 */
void
CRealAudioSimplePacketFeeder::_Reset(void)
{
    IHXPacket* pPacket;

    if (m_pPendingPacketQueue != NULL)
    {
	while (!m_pPendingPacketQueue->IsEmpty())
	{
	    pPacket = (IHXPacket*)m_pPendingPacketQueue->RemoveHead();
	    HX_RELEASE(pPacket);
	}
    }

    m_ulContinueDiscardUntilTime = NO_TIME_SET;
    m_ulLastPacketTime = NO_TIME_SET;
    m_bEndOfPackets = FALSE;
}