audrend.h

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

    //
    STDMETHOD (OnPacket)	(THIS_
				IHXPacket*	    pPacket,
				LONG32		    lTimeOffset);

    /////////////////////////////////////////////////////////////////////////
    //	Method:
    //	    IHXRenderer::OnTimeSync
    //	Purpose:
    //	    Called by client engine to inform the renderer of the current
    //	    time relative to the streams synchronized time-line. The 
    //	    renderer should use this time value to update its display or
    //	    render it's stream data accordingly.
    //
    STDMETHOD (OnTimeSync)	(THIS_
				ULONG32		    ulTime);

    /////////////////////////////////////////////////////////////////////////
    //  Method:
    //	    IHXRenderer::OnPreSeek
    //  Purpose:
    //	    Called by client engine to inform the renderer that a seek is
    //	    about to occur. The render is informed the last time for the 
    //	    stream's time line before the seek, as well as the first new
    //	    time for the stream's time line after the seek will be completed.
    //
    STDMETHOD (OnPreSeek)	(THIS_
				ULONG32		    ulOldTime,
				ULONG32		    ulNewTime);

    /////////////////////////////////////////////////////////////////////////
    //	Method:
    //	    IHXRenderer::OnPostSeek
    //	Purpose:
    //	    Called by client engine to inform the renderer that a seek has
    //	    just occured. The render is informed the last time for the 
    //	    stream's time line before the seek, as well as the first new
    //	    time for the stream's time line after the seek.
    //
    STDMETHOD (OnPostSeek)	(THIS_
				ULONG32		    ulOldTime,
				ULONG32		    ulNewTime);

    /////////////////////////////////////////////////////////////////////////
    //	Method:
    //	    IHXRenderer::OnPause
    //	Purpose:
    //	    Called by client engine to inform the renderer that a pause has
    //	    just occured. The render is informed the last time for the 
    //	    stream's time line before the pause.
    //
    STDMETHOD (OnPause)		(THIS_
				ULONG32		    ulTime);

    /////////////////////////////////////////////////////////////////////////
    //	Method:
    //		IHXRenderer::OnBegin
    //	Purpose:
    //		Called by client engine to inform the renderer that a begin or
    //		resume has just occured. The render is informed the first time 
    //		for the stream's time line after the resume.
    //
    STDMETHOD (OnBegin)		(THIS_
				ULONG32		    ulTime);

    /////////////////////////////////////////////////////////////////////////
    //	Method:
    //		IHXRenderer::OnBuffering
    //	Purpose:
    //		Called by client engine to inform the renderer that buffering
    //		of data is occuring. The render is informed of the reason for
    //		the buffering (start-up of stream, seek has occured, network
    //		congestion, etc.), as well as percentage complete of the 
    //		buffering process.
    //
    STDMETHOD (OnBuffering)	(THIS_
				ULONG32		    ulFlags,
				UINT16		    unPercentComplete);

    /////////////////////////////////////////////////////////////////////////
    //	Method:
    //		IHXRenderer::GetDisplayType
    //	Purpose:
    //		Called by client engine to ask the renderer for it's preferred
    //		display type. When layout information is not present, the 
    //		renderer will be asked for it's prefered display type. Depending
    //		on the display type a buffer of additional information may be 
    //		needed. This buffer could contain information about preferred
    //		window size.
    //
    STDMETHOD (GetDisplayType)	(THIS_
				REF(HX_DISPLAY_TYPE)	ulFlags,
				REF(IHXBuffer*)	pBuffer);

    /************************************************************************
     *	Method:
     *	    IHXRenderer::OnEndofPackets
     *	Purpose:
     *	    Called by client engine to inform the renderer that all the
     *	    packets have been delivered. However, if the user seeks before
     *	    EndStream() is called, renderer may start getting packets again
     *	    and the client engine will eventually call this function again.
     */
    STDMETHOD(OnEndofPackets)	(THIS);
    
    /*
     *  IHXDryNotification methods
     */
    /************************************************************************
     *  Method:
     *      IHXDryNotificationOnDryNotification
     *  Purpose:
     *	    This function is called when it is time to write to audio device 
     *	    and there is not enough data in the audio stream. The renderer can
     *	    then decide to add more data to the audio stream. This should be 
     *	    done synchronously within the call to this function.
     *	    It is OK to not write any data. Silence will be played instead.
     */
    STDMETHOD(OnDryNotification) (THIS_
				  UINT32 /*IN*/ ulCurrentStreamTime,
				  UINT32 /*IN*/ ulMinimumDurationRequired);

    /*
     * IHXStatistics methods
     */
    STDMETHOD(InitializeStatistics) (THIS_ UINT32 ulRegistryID);
    STDMETHOD(UpdateStatistics)     (THIS);

    /*
     *	IHXInterruptSafe methods
     */
    /************************************************************************
     *	Method:
     *	    IHXInterruptSafe::IsInterruptSafe
     *	Purpose:
     *	    This is the function that will be called to determine if
     *	    interrupt time execution is supported.
     */
    STDMETHOD_(BOOL,IsInterruptSafe)	(THIS) 
    					{ return TRUE; };

    IUnknown* GetContext(void)
    {
	return m_pContext;
    }

    static LONG32 CmpTime(ULONG32 ulTime1, ULONG32 ulTime2)
    {
	return ((LONG32) (ulTime1 - ulTime2));
    }

    /************************************************************************
     *	Public Statistics Methods
     */
#if defined(HELIX_FEATURE_STATS)
    HX_RESULT ReportStat(AudioStatEntryID eEntryID, char* pVal)
    {
	return m_pAudioStats->ReportStat(eEntryID, pVal);
    }
    
    HX_RESULT ReportStat(AudioStatEntryID eEntryID, INT32 lVal)
    {
	return m_pAudioStats->ReportStat(eEntryID, lVal);
    }
#else	// HELIX_FEATURE_STATS

    HX_RESULT ReportStat(AudioStatEntryID eEntryID, char* pVal)
    {
	return HXR_OK;
    }
    
    HX_RESULT ReportStat(AudioStatEntryID eEntryID, INT32 lVal)
    {
	return HXR_OK;
    }
#endif	// HELIX_FEATURE_STATS

protected:
    virtual ~CAudioRenderer();

    /*
     *	Renderer's customizable fuctions - can be called any time
     */
    /*
     *	Fixed Renderer Configuration - must be callable at any time
     */
    virtual const char* GetUpgradeMimeType(void);

    virtual const char* GetRendererName(void);

    virtual const char* GetCodecName(void);

    virtual const char* GetCodecFourCC(void);

    /*
     *	Renderer Configuration - must be callable any time
     *                           after reception of the header
     */
    virtual void GetStreamVersion(ULONG32 &ulThisMajorVersion, 
				  ULONG32 &ulThisMinorVersion);

    virtual void GetContentVersion(ULONG32 &ulThisMajorVersion, 
				   ULONG32 &ulThisMinorVersion);

    virtual CAudioFormat* CreateFormatObject(IHXValues* pHeader);

    /*
     *	Renderer's member variables sharable with the derived renderer
     */
    IUnknown*				m_pContext;
    IHXStream*				m_pStream;
    IHXBackChannel*			m_pBackChannel;
    IHXValues*				m_pHeader;
    IHXErrorMessages*                   m_pErrorMessages;
    IHXCommonClassFactory*		m_pCommonClassFactory;
    IHXPreferences*			m_pPreferences;
    IHXRegistry*			m_pRegistry;
    ULONG32				m_ulRegistryID;

    CAudioFormat*			m_pAudioFormat;

#if defined(HELIX_FEATURE_STATS)
    CAudioStatistics*			m_pAudioStats;
#else
    void*                               m_pAudioStats;
#endif /* HELIX_FEATURE_STATS */

    LONG32				m_lRefCount;
};

#endif // _AUDREND_H_