end_time_strategy.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: end_time_strategy.h,v 1.2.4.1 2004/11/24 18:02:52 acolwell Exp $
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 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * Source License (the "RPSL") available at
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 * the file under the current version of the RealNetworks Community
 * Source License (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
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
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 * "GPL") in which case the provisions of the GPL are applicable
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 * ***** END LICENSE BLOCK ***** */
#ifndef END_TIME_STRATEGY_H
#define END_TIME_STRATEGY_H

#include "page_strategy.h"
#include "ogg_timestamp.h"

class COggCodecInfo;

class COggGroupEndTimeStrategy : public COggPageStrategy
{
public:
    COggGroupEndTimeStrategy();
    virtual ~COggGroupEndTimeStrategy();

    // COggPageStrategy methods
    virtual HX_RESULT ReadNextPageDone(HX_RESULT status,
                                       ULONG32 ulFileOffset,
                                       UINT32 ulPageSize,
                                       ogg_page* pPage);
    virtual BOOL Done() const;
    virtual void Close();

    // COggGroupEndTimeStrategy methods
    HX_RESULT Init(COggPageReader* pPageReader, ULONG32 ulStartOffset,  
                   ULONG32 ulLastPageOffset, UINT32 uLastPageSize,
                   int serialNum, const COggCodecInfo* pCodecInfo);

    HX_RESULT GetDuration(COggTimestamp& duration) const;

private:
    typedef enum {
        ssStart,
        ssInitialized,
        ssSearchingForValidGranule,
        ssComputingEndTime,
        ssDone,
    } StrategyState;

    void changeState(StrategyState newState);
    HX_RESULT seekBackMore();
    HX_RESULT handleSearchForValidGranule(HX_RESULT status,
                                          ULONG32 ulFileOffset,
                                          UINT32 ulPageSize,
                                          ogg_page* pPage);
    HX_RESULT handleComputingEndTime(HX_RESULT status,
                                     ULONG32 ulFileOffset,
                                     UINT32 ulPageSize,
                                     ogg_page* pPage);

    COggPageReader* m_pPageReader;
    StrategyState m_state;
    
    ULONG32 m_ulStartOffset;
    ULONG32 m_ulLastPageOffset;
    UINT32 m_uLastPageSize;
    int m_serialNum;
    COggCodecInfo* m_pCodecInfo;

    ogg_int64_t m_endGranulePos;

    ULONG32 m_ulLastSeekOffset;
    ULONG32 m_ulLastOffsetChecked;

    ogg_stream_state m_os;
};

#endif /* END_TIME_STRATEGY_H */