buffmgr.h

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 ***** */ 

#ifndef _BUFFMGR_H_
#define _BUFFMGR_H_

class HXSource;

typedef enum _buffer_state
{
    BUFFMGR_READY = 0,
    BUFFMGR_SEEK, 
    BUFFMGR_REBUFFER
} BUFFER_STATE;

class CBufferManager
{
private:

    UINT32		m_ulMaxAdditionalBufferingInMs;
    UINT32		m_ulAdditionalBufferingInMs;
    INT64		m_llHighestTimeStamp;
    UINT32		m_ulTotalPauseTime;
    UINT32		m_ulLastPauseTime;
    UINT32		m_ulBufferingStartTime;
    UINT32		m_ulMinimumInitialAudioPreroll;
    UINT32		m_ulMinimumSourcePreroll;

    BUFFER_STATE	m_state;
    HX_BITFIELD		m_bLocalPlayback : 1;
    HX_BITFIELD		m_bPerfectPlay : 1;
    HX_BITFIELD		m_bPaused : 1;
    HX_BITFIELD		m_bBufferStartTimeToBeSet : 1;
    HX_BITFIELD		m_bFirstResumeDone : 1;
    HX_BITFIELD		m_bIsSeekPerformed : 1;
    
    HX_BITFIELD		m_bBufferedPlay : 1;
    HX_BITFIELD		m_bBufferCalcToBeChanged : 1;
    HX_BITFIELD		m_bIsInitialized : 1;
    UINT32		m_ulSeekTime;
    HXSource*		m_pParent;
    CHXMapLongToObj*	m_pStreamInfoTable;

protected:
    HX_RESULT	Reset(UINT32 ulSeekTime = 0, BOOL bSeekInsideRecordBuffer = FALSE);

    UINT32      GetElapsedTime(UINT32 ulCurrentTime);

    void        UpdateHighestTimestamps(INT64 llActualTimeStamp,
					STREAM_INFO* pStreamInfo);

    void        UpdateMinimumPreroll(BOOL bModifyStartTime);
    void        SetPerfectPlay(BOOL bPerfectPlay);
public:

    CBufferManager(HXSource* pParent);
    ~CBufferManager();

    // initialization
    HX_RESULT	Init(void);

    // set minimum preroll
    HX_RESULT	SetMinimumPreroll(BOOL bPerfectPlay, UINT32 ulSourcePreroll,
				  UINT32 ulInitialAudioPreroll,
				  BOOL	 bModifyStartTime = TRUE);

    // stop the buffering(i.e. reach the end of source)
    HX_RESULT	Stop(void);

    // notify the seek
    HX_RESULT	DoSeek(UINT32 ulSeekTime, BOOL bSeekInsideRecordBuffer = FALSE);

    // pause
    HX_RESULT	DoPause(void);

    // resume
    HX_RESULT	DoResume(void);

    // rebuffer
    HX_RESULT	ReBuffer(void);

    // update counters
    HX_RESULT	UpdateCounters(IHXPacket* pPacket);

    // get status
    HX_RESULT	GetStatus(REF(UINT16)	    uStatusCode,
			  REF(IHXBuffer*)  pStatusDesc,
			  REF(UINT16)	    uPercentDone);

    // get remain to buffer
    HX_RESULT	GetRemainToBuffer(REF(UINT32)	ulRemainToBufferInMs,
				  REF(UINT32)	ulRemainToBuffer);

    /* Get excess buffer info from Transport layer */
    HX_RESULT	GetExcessBufferInfo(REF(UINT32)	ulRemainToBufferInMs,
				    REF(UINT32)	ulRemainToBuffer,
				    REF(UINT32)	ulExcessBufferInMs,
				    REF(UINT32)	ulExcessBuffer,
				    REF(BOOL)	bValidInfo,
				    REF(UINT32)	ulActualExcessBufferInMs,
				    REF(UINT32) ulActualExcessBuffer);

    // get maximum preroll
    HX_RESULT	GetMaximumPreroll(REF(UINT32)	ulMaximumPrerollInMs);

    void	EnterBufferedPlay(void);
    void	LeaveBufferedPlay(void);
};

#endif /* _BUFFERMGR_H_ */