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hxaudses.h：源码内容
							/* ***** 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 
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 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 
#ifndef _HXAUDSES_H
#define _HXAUDSES_H
#include "hxaudtyp.h" 
#ifdef _UNIX
#include <fcntl.h>
#include <sys/stat.h>
#endif
// foward decls.
struct IHXCallback;
struct IHXScheduler;
struct IHXPreferences;
struct IHXAudioDeviceResponse;
struct IHXAudioPlayerResponse;
struct IHXAudioAdviseSink;
struct IHXAudioDeviceManager;
struct IHXAudioHook;
struct IHXInterruptState;
typedef struct _HXAudioFormat HXAudioFormat;
class CHXAudioPlayer;
class CHXAudioDevice;
class CHXAudioStream;
class CHXSimpleList;
class HXVolumeAdviseSink;
struct IHXBuffer;
class Timeval;
class HXThread;
class HXMutex;
class HXEvent;
#ifdef HELIX_CONFIG_MIN_PCM_PUSHDOWN_BYTES
#define MINIMUM_INITIAL_PUSHDOWN    100
#else
#define MINIMUM_INITIAL_PUSHDOWN    4000
#endif
typedef enum
{
    BUFFER_NONE     = 0,
    BUFFER_PLAYER   = 1,
    BUFFER_SESSION  = 2
} BufType;
class   CHXAudioSession : public IHXAudioDeviceResponse, 
                          public IHXAudioDeviceManager,
                          public IHXAudioHookManager,
                          public IHXAudioDeviceManager2,
#ifdef HELIX_FEATURE_VOLUME                          
                          public IHXVolumeAdviseSink,
#endif                          
                          public IHXCallback,
                          public IHXAudioResamplerManager,
                          public IHXAudioPushdown2
{
  public:
    /*
     *      IUnknown methods
     */
    STDMETHOD(QueryInterface)   (THIS_
                                 REFIID riid,
                                 void** ppvObj);
    STDMETHOD_(ULONG32,AddRef)  (THIS);
    STDMETHOD_(ULONG32,Release) (THIS);
    CHXAudioSession(void);
#ifdef HELIX_FEATURE_VOLUME                          
    //IHXVolumeAdviseSink methods
    inline STDMETHOD(OnVolumeChange) (THIS_ const UINT16 uVolume )
    {
        SetVolume(uVolume);
        return HXR_OK;
    }
    inline STDMETHOD(OnMuteChange)(THIS_ const BOOL bMute )
    {
        SetMute(bMute);
        return HXR_OK;
    }
#endif
    
    /*
     *      IHXAudioDeviceManager methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioDeviceManager::Replace
     *  Purpose:
     *  This is used to replace the default implementation of the audio
     *  device by the given audio device interface. 
     */
    STDMETHOD(Replace) (THIS_
                        IHXAudioDevice*    /*IN*/ pAudioDevice);
    /************************************************************************
     *  Method:
     *      IHXAudioDeviceManager::Remove
     *  Purpose:
     *  This is used to remove the audio device given to the manager in
     *  the earlier call to Replace.
     */
    STDMETHOD(Remove) (THIS_
                       IHXAudioDevice*    /*IN*/ pAudioDevice);
    /************************************************************************
     *  Method:
     *   IHXAudioDeviceManager::AddFinalHook
     *  Purpose:
     *       One last chance to modify data being written to the audio device.
     *       This hook allows the user to change the audio format that
     *   is to be written to the audio device. This can be done in call
     *   to OnInit() in IHXAudioHook.
     */
    STDMETHOD(SetFinalHook) (THIS_
                             IHXAudioHook*      /*IN*/ pHook
                             );
    /************************************************************************
     *  Method:
     *   IHXAudioDeviceManager::RemoveFinalHook
     *  Purpose:
     *       Remove final hook
     */
    STDMETHOD(RemoveFinalHook)  (THIS_
                                 IHXAudioHook*    /*IN*/ pHook
                                 );
    /************************************************************************
     *  Method:
     *      IHXAudioDeviceManager::GetAudioFormat
     *  Purpose:
     *           Returns the audio format in which the audio device is opened.
     *           This function will fill in the pre-allocated HXAudioFormat 
     *           structure passed in.
     */
    STDMETHOD(GetAudioFormat)   (THIS_
                                 HXAudioFormat*      /*IN/OUT*/pAudioFormat);
    /*
     *      IHXAudioDeviceResponse methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioDeviceResponse::OnTimeSync
     *  Purpose:
     *      Notification interface provided by users of the IHXAudioDevice
     *      interface. This method is called by the IHXAudioDevice when
     *      audio playback occurs.
     */
    STDMETHOD(OnTimeSync) (THIS_
                           ULONG32                         /*IN*/ ulTimeEnd);
    /*
     *  IHXAudioHookManager methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioHookManager::AddHook
     *  Purpose:
     *           Use this to add a hook 
     */
    STDMETHOD(AddHook)   (THIS_
                          IHXAudioHook* /*IN*/ pHook);
    /************************************************************************
     *  Method:
     *      IHXAudioHookManager::RemoveHook
     *  Purpose:
     *           Use this to remove a hook 
     */
    STDMETHOD(RemoveHook) (THIS_
                           IHXAudioHook* /*IN*/ pHook);
    /*
     *  IHXAudioDeviceManager2 methods
     */
    /**********************************************************************
     *  Method:
     *      IHXAudioDeviceManager2::IsReplacedDevice
     *  Purpose:
     *  This is used to determine if the audio device has been replaced.
     */
    STDMETHOD_(BOOL, IsReplacedDevice) (THIS);
    /*
     *  IHXAudioResamplerManager methods
     *
     */
    STDMETHOD(CreateResampler) (THIS_
                                HXAudioFormat               inAudioFormat,
                                REF(HXAudioFormat)          outAudioFormat,
                                REF(IHXAudioResampler*)    pResampler);
    /*
     *  IHXAudioPushdown methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioPushdown::SetAudioPushdown
     *  Purpose:
     *           Use this to set the minimum audio pushdown value in ms.
     *           This is the amount of audio data that is being written 
     *           to the audio device before starting playback.
     */
    STDMETHOD(SetAudioPushdown) (THIS_
                                 UINT32 /*IN*/ ulMinimumPushdown);
    /************************************************************************
     *  Method:
     *      IHXAudioPushdown2::GetAudioPushdown
     *  Purpose:
     *           Use this to get the minimum audio pushdown value in ms.
     *           This is the amount of audio data that is being written 
     *           to the audio device before starting playback.
     */
    STDMETHOD(GetAudioPushdown) (THIS_
                                 REF(UINT32) /*OUT*/ ulAudioPushdown);
    /************************************************************************
     *  Method:
     *      IHXAudioPushdown2::GetCurrentAudioDevicePushdown
     *  Purpose:
     *           Use this to get the audio pushed down to the audio device and haven't
     *           been played yet
     */
    STDMETHOD(GetCurrentAudioDevicePushdown)   (THIS_
                                                REF(UINT32) /*OUT*/ ulAudioPusheddown);
    /* It gets Scheduler interface from the context.
     * The session object keeps a list of audio player objects.
     * Create a session list; add this session to the list.
     */
    HX_RESULT Init(IUnknown* pContext);
    /* Setup is called by Audio Player object.
     */
    HX_RESULT Setup (BOOL bHasStreams);
    /* Create audio player. The RMA session object calls this
     * for each Player it knows about.
     */
    virtual HX_RESULT CreateAudioPlayer(CHXAudioPlayer**  ppAudioPlayer);
    HX_RESULT         _CreateAudioPlayer(CHXAudioPlayer** ppAudioPlayer);
    HX_RESULT       CloseAudioPlayer( CHXAudioPlayer*   pAudioPlayer);
    void            Close(void);
    /* The session object determines the audio device format based
     * on all of its players.
     */
    HX_RESULT       GetDeviceFormat(void);
    /* Open is called to open the audio device.
     */
    HX_RESULT       OpenAudio    (void);
    HX_RESULT       OpenDevice   (void);
        
    /* PlayAudio is called by Audio Player object.
     */
    HX_RESULT       PlayAudio    (UINT16 uNumBlocks = 1);
    /* Pause is called by Audio Player object.
     */
    HX_RESULT       Pause (CHXAudioPlayer* p);
    /* Resume is called by Audio Player object.
     */
    HX_RESULT       Resume (CHXAudioPlayer* pPlayer = NULL);
    /* Stop is called by Audio Player object.
     */
    HX_RESULT       Stop  (CHXAudioPlayer* p, BOOL bFlush);
    /* Seek is called by Audio Player object.
     */
    HX_RESULT       Seek    (
        CHXAudioPlayer* pPlayerToExclude, 
        const UINT32    ulSeekTime
        );
    /* Return the device volume interface */
    inline IHXVolume* GetDeviceVolume()
    {
#if defined(HELIX_FEATURE_VOLUME)
        if( m_pDeviceVolume )
            m_pDeviceVolume->AddRef();
        return m_pDeviceVolume;
#else
        return NULL;
#endif /* HELIX_FEATURE_VOLUME */
    }
    /* The player object sets the granularity; I think the RMA session
     * object should do this after it resolves the granularity amongst
     * all of its players.
     */
    /* Granularity is always 100ms now...
     * The core keeps track of the granularity requirements for each 
     * renderer and queries audio sesssion. 
     */
    ULONG32         SetGranularity(ULONG32 ulGranularity);
    /* Reset audio session; flush buffers, etc.
     */
    virtual void        ResetSession(void);
    virtual HX_RESULT   ProcessAudioHook(PROCESS_ACTION action, 
                                         IHXAudioHook* pAudioHook);
    virtual HX_RESULT   ProcessAudioDevice(PROCESS_ACTION action, 
                                           IHXAudioDevice* pAudioDevice);
    virtual HX_RESULT   CreateAudioDevice();
    void                ReleaseAudioDevice();
    void                RestoreReplacedDevice();
    ULONG32         GetCurrentPlayBackTime(void);
    /* Get format that audio device was opened with. */
    void GetFormat( HXAudioFormat*       pAudioFmt );
    /* Return the core scheduler interface.
     */
    inline void GetScheduler(IHXScheduler** pScheduler)
    {
        *pScheduler = m_pScheduler;
    };
    void SetVolume(const UINT16 uVolume );
    UINT16 GetVolume();
    void SetMute(const BOOL bMute);
    inline BOOL GetMute()
    {
        return m_bMute;
    }
    
    /* Return the current time in timeline. */
    //ULONG32       GetCurrentPlaybackTime(void);
    /* Returns true if any audio player is playing... */
    BOOL            IsPlaying(void);
    /* Returns number of active players (which are not is a STOP state).*/
    UINT16          NumberOfActivePlayers(void);
    UINT16          NumberOfResumedPlayers(void);
    inline void     ToBeRewound() {m_bToBeRewound = TRUE;};
    BOOL            CheckDisableWrite(void);
    ULONG32         GetInitialPushdown(BOOL bAtStart = FALSE);
    HX_RESULT       CheckToPlayMoreAudio();
    HX_RESULT       TryOpenAudio    (void); // attempt to open audio
        
    void            StopAllOtherPlayers();
    inline HX_RESULT     CheckForBufferReuse();
    void            ConvertTo8BitAndOrMono(HXAudioData* pAudioData);
    
    double          ConvertMsToBytes(UINT32 ulCurrentTime);
    inline double          NumberOfBytesWritten() {return m_dNumBytesWritten;};
    inline double          GetNumBytesPlayed() {return m_dNumBytesPlayed;};
    void            SetCoreMutex(HXMutex* pMutex) {m_pCoreMutex = pMutex;};
    void            CheckIfLastNMilliSecsToBeStored();
    void            RewindSession(CHXAudioPlayer* pPlayerToExclude = NULL);
    void            RewindAllPlayers(UINT32 ulCurTime,
                                     UINT32 ulTimeToRewind,
                                     CHXAudioPlayer* pPlayerToExclude);
    HX_RESULT       ActualResume();
    inline UINT32   GetLastRewindTimestamp(void) {return m_ulLastRewindTimestamp;};
    BOOL            ReallyNeedData();
    inline void     UseCoreThread() {m_bShouldOpenOnCoreThread = TRUE;};
    inline void     PostMixHooksUpdated(void) { m_bPostMixHooksUpdated = TRUE; };
    BOOL GetDisableMultiPlayPauseSupport();
    //IHXCallback stuff
    STDMETHOD(Func) (THIS);
    IUnknown*                       m_pContext;
    class HXDeviceSetupCallback :
        public IHXCallback,
        public IHXInterruptSafe
    {
    private:
        ~HXDeviceSetupCallback();
        PRIVATE_DESTRUCTORS_ARE_NOT_A_CRIME
        
        CHXAudioSession* m_pAudioSessionObject;
        ULONG32          m_ulCallbackID;
        LONG32           m_lRefCount;
    public:
        HXDeviceSetupCallback(CHXAudioSession* it);
        STDMETHOD(QueryInterface) (THIS_ REFIID riid, void** ppvObj);
        STDMETHOD_(ULONG32,AddRef) (THIS);
        STDMETHOD_(ULONG32,Release) (THIS);
        STDMETHOD(Func) (THIS);
        STDMETHOD_(BOOL,IsInterruptSafe) (THIS);
        void PendingID(ULONG32 it )
            { m_ulCallbackID = it;}
        ULONG32 PendingID()
            { return m_ulCallbackID; }
        
    };
    friend class CHXAudioSession::HXDeviceSetupCallback;
  protected:
    ~CHXAudioSession(void);
    PRIVATE_DESTRUCTORS_ARE_NOT_A_CRIME
    void _ConstructIfNeeded();
    
        private:
#ifdef _MACINTOSH
    static  BOOL                                    zm_Locked;
#endif
    LONG32                          m_lRefCount;
    IHXScheduler*                   m_pScheduler;
    IHXPreferences*         m_pPreferences;
    IHXInterruptState*              m_pInterruptState;
    HXAudioFormat                  m_BeforeHookDeviceFmt;       // Actual Audio device format.
    HXAudioFormat                  m_ActualDeviceFmt;       // Actual Audio device format.
    HXAudioFormat                  m_DeviceFmt;            // Audio device format used for all calculations.
    IHXBuffer*                      m_pPlayerBuf;
    IHXBuffer*                      m_pSessionBuf;
    ULONG32                         m_ulGranularity;         // Amount of audio to push (ms).
    double                          m_dGranularity;
    ULONG32                         m_ulMinimumPushdown;
    ULONG32                         m_ulIdealMinimumPushdown;
    ULONG32                         m_ulMinBlocksTobeQueued;
    ULONG32                         m_ulMinBlocksTobeQueuedAtStart;
    ULONG32                         m_ulBytesPerGran;       // Number of bytes in gran
    ULONG32                         m_ulBlocksWritten;      // Number of blocks written so far
    ULONG32 m_ulCallbackID;
    BOOL    m_bFakeAudioTimeline;
    
    BOOL                            m_bShouldOpenOnCoreThread;
    BOOL                            m_bToBeReOpened;
    HXDeviceSetupCallback*          m_pDeviceCallback;
    BOOL                            m_bHasStreams;          // True if there are audio streams
    /* We keep a track of the current time when we use Scheduler for 
     * genertaing time syncs.
     */
    ULONG32                         m_ulIncreasingTimer;
    /* This is the actual time we report back to the player->renderers
     * It gets set in the OnTimeSync
     */
    ULONG32                         m_ulCurrentTime;
    ULONG32                         m_ulLastAudioTime;
    ULONG32                         m_ulLastAudioReturnTime;
    ULONG32                         m_ulLastSystemTime;
    BOOL                            m_bAtLeastOneTimeReceived;
    ULONG32                         m_ulStartTime;
    BOOL                            m_bTimeSyncReceived;
    BOOL                            m_bPaused;
    BOOL                            m_bStoppedDuringPause;
    ULONG32                         m_ulLastFakeCallbackTime;
    Timeval*                        m_pFakeAudioCBTime;
    HXAudioData*                    m_pInDataPtr;
    HXAudioData*                    m_pOutDataPtr;
    /*
     * Should be in a data structure with the player objects and stuffed
     * on the list.
     */
    IHXAudioPlayerResponse*         m_pPlayerResponse; // Notification interface
    BOOL                            m_bFirstPlayAudio;
    UINT16                          m_uVolume;              // Default volume
    BOOL                            m_bMute;                // the mute state
    BOOL                            m_bAudioDeviceSupportsVolume;
    /*
     * Continuous session play back time. This is the time written to the audio
     * device object for each buffer. This is the time that each audio player 
     * retrieves as its start time.
     */
    double                          m_dBufEndTime;
    BOOL                            m_bDisableWrite;
    BOOL                            m_bInPlayAudio;
    BOOL                            m_bInActualResume;
    double                          m_dNumBytesWritten;
    double                          m_dNumBytesPlayed;
    /* CheckAudioFormat Interface is called by audio player to 
     * check resample audio format with audio device format.
     */
    HX_RESULT               CheckAudioFormat( 
        HXAudioFormat* pAudioFormat );
    /* Create the playback buffer.
     */
    HX_RESULT               CreatePlaybackBuffer(void);
    void                    OnTimerCallback();
    inline void CheckAudioVolume()
    {}
    
    /* Write audio data to post mix hooks. */
    HX_RESULT               ProcessPostMixHooks(
        CHXAudioPlayer* pPlayer,
        IHXBuffer*&    pInBuffer,
        BOOL*           bDisableWrite,
        UINT32          ulBufTime,
        BOOL&           bChanged);
        
    void                    InitHooks();
    void                    ProcessHooks(HXAudioData* pAudioData);
    /* Convert 16-bit buffer to 8-bit */
    void                    ConvertToEight(void);
    BOOL                    IsAudioOnlyTrue(void);
        
    UINT32                  AnchorDeviceTime(UINT32 ulCurTime);
    void                    AdjustInRealTime();
    HX_RESULT               Rewind();
    void                    UpdateMinimumPushdown();
    void                    ReopenDevice();
    
  protected:
    BOOL                m_bInited;          // is audio setup?
    IHXAudioDevice*    m_pAudioDev; // device layer
    IHXAudioDevice*    m_pCurrentAudioDev;  // keep track of the current device layer
    IHXAudioDevice*    m_pReplacedAudioDev; // keep track of replaced audio device
    BOOL                m_bReplacedDev;     // is audio device replaced?
    CHXSimpleList*      m_pPlayerList;      // list of player audio sessions
    CHXSimpleList*      m_pHookList;        // hook list
    // Any audio buffers that we were not able to write to the audio 
    // device successfully
    CHXSimpleList*      m_pAuxiliaryAudioBuffers;
    HXMutex*            m_pMutex;
    IHXAudioHook*       m_pFinalHook;
    BOOL                m_bUseFinalHook;
    HXMutex*            m_pCoreMutex;
    UINT16              m_uAskFromAudioDevice;
    BOOL                m_bDeferActualResume;
    CHXAudioPlayer*     m_pLastPausedPlayer;
    BOOL                m_bUsingReplacedDevice;
    BOOL                m_bToBeRewound;
    UINT32              m_ulLastRewindTimestamp;
    UINT16              m_uNumToBePushed;
    BOOL                m_bSessionBufferDirty;
    BOOL                m_bPostMixHooksUpdated;
    IHXMultiPlayPauseSupport* m_pMPPSupport;
#ifdef HELIX_FEATURE_VOLUME
    IHXVolume*          m_pDeviceVolume;
#endif    
};
#endif  // _HXAUDSES_H

						