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hxaudses.cpp

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: hxaudses.cpp,v 1.39.2.6 2004/10/25 21:32:40 gwright Exp $
 * 
 * Portions Copyright (c) 1995-2004 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 (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * 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
 * 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.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * 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 ***** */

#include "hxtypes.h"
#include "safestring.h"
#include "hlxclib/stdio.h"
#include "hlxclib/string.h"
#include "hlxclib/stdlib.h"


#ifndef WIN32_PLATFORM_PSPC
#include "hlxclib/signal.h"
#else
#include <winbase.h>
#include <dbgapi.h>
#endif

//#define _TESTING    1
#ifdef _TESTING
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

#if defined (_WINDOWS) || defined (_WIN32)

#include <io.h>

#endif

#endif

//#include "racodec.h"
#include "hxresult.h"

#include "hxcom.h"

#include "hxshtdn.h"
#include "hxengin.h"
#include "hxausvc.h"
#include "hxrasyn.h"
#include "hxprefs.h"
#include "ihxpckts.h"
#include "chxpckts.h"

#include "auderrs.h"
#include "hxslist.h"
#include "hxtick.h"

#ifdef _SYMBIAN
#include "audsymbian.h"
#else
#include "hxaudev.h"
#endif

#include "hxaudply.h"
#include "hxaudstr.h"
#include "hxaudvol.h"

#include "timeval.h"

#include "hxaudses.h"
#include "hxaudtyp.h"

#include "hxmixer.h"
#include "hxthread.h"
#if defined (HELIX_FEATURE_RESAMPLER) && !defined (HELIX_CONFIG_FIXEDPOINT)
#include "hxrsmp2.h"
#endif /* HELIX_FEATURE_RESAMPLER && !HELIX_CONFIG_FIXEDPOINT */

#include "hxprefs.h"
#include "hxprefutil.h"

class CHXAudioPlayer;

#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE
static const char HX_THIS_FILE[] = __FILE__;
#endif

#if defined(HELIX_CONFIG_MIN_PCM_PUSHDOWN_BYTES)
// The following value was arrived at via trial and error and has been
// demonstrated to give optimal heap usage values for RA8, ATRAC3, & MP3.
#define IDEAL_MINIMAL_INITIAL_PUSHDOWN  500 //ms
#else
#define IDEAL_MINIMAL_INITIAL_PUSHDOWN  1000 // ms
#endif
#define MIN_BLOCKS_TOBEQUEUED   (m_ulMinimumPushdown*1.0/m_ulGranularity)
#define SOME_INSANELY_LARGE_VALUE       3600000 /* 1 hour */

#ifdef _WIN32
#define HXMSG_QUIT              (WM_USER + 200) /* Exit from the thread */
#define HXMSG_RESUME            (WM_USER + 201) /* Resume audio thread */
#define HXMSG_STOP              (WM_USER + 202) /* Stop audio thread */
#else
#define HXMSG_QUIT              200             /* Exit from the thread */
#define HXMSG_RESUME            201             /* Change timer value */
#define HXMSG_STOP              202             /* Stop audio thread */
#endif /*_WIN32*/

#ifdef _MACINTOSH
BOOL    CHXAudioSession::zm_Locked=FALSE;
#endif /* _MACINTOSH */

#ifdef _UNIX
IHXPreferences* z_pIHXPrefs =  NULL;
#endif


//XXXgfw can whatever this SH4 is be moved down into the audio device
//code for this chipset? This is how we don't allow certain sample
//rates in other devices; by returning HXR_FAIL from _imp_checkformat.
#if !defined(SH4)
const unsigned short z_anValidSampleRates[] = { 8000,
                                                11025,
                                                16000,
                                                22050,
                                                32000,
                                                44100
                                                };
#else
const unsigned short z_anValidSampleRates[] = { 11025,
                                                22050,
                                                44100
                                                };
#endif

struct tableEntry
{
    UINT16 usSampleRate;
    UINT8  usChannels;
    UINT8  usBits;

    inline void set(UINT16 sr,
                    UINT8  chan,
                    UINT8  bits
                    )
        {
            usSampleRate = sr;
            usChannels   = chan;
            usBits       = bits;
        }
};




/*
 *  HXAudioSession methods
 */
/************************************************************************
 *  Method:
 *              CHXAudioSession::CHXAudioSession()
 *      Purpose:
 *              Constructor. Create player list.
 */
CHXAudioSession::CHXAudioSession()
    : m_pContext(NULL)
    , m_lRefCount(0)
    , m_pScheduler (0)
    , m_pPreferences(0)
    , m_pInterruptState(0)
    , m_pPlayerBuf (NULL)
    , m_pSessionBuf (NULL)
    , m_ulGranularity(0)
    , m_dGranularity((double) 0.)
    , m_ulMinimumPushdown(MINIMUM_INITIAL_PUSHDOWN)
    , m_ulIdealMinimumPushdown(IDEAL_MINIMAL_INITIAL_PUSHDOWN)
    , m_ulMinBlocksTobeQueued(1)
    , m_ulMinBlocksTobeQueuedAtStart(1)
    , m_ulBytesPerGran(0)
    , m_ulBlocksWritten(0)
    , m_ulCallbackID(0)
    , m_bFakeAudioTimeline(FALSE)
    , m_bShouldOpenOnCoreThread(FALSE)
    , m_bToBeReOpened(FALSE)
    , m_pDeviceCallback(NULL)
    , m_bHasStreams(FALSE)
    , m_ulIncreasingTimer (0)
    , m_ulCurrentTime (0)
    , m_ulLastAudioTime(0)
    , m_ulLastAudioReturnTime(0)
    , m_ulLastSystemTime(0)
    , m_bAtLeastOneTimeReceived(FALSE)
    , m_ulStartTime(0)
    , m_bTimeSyncReceived(FALSE)
    , m_bPaused(TRUE)
    , m_bStoppedDuringPause(FALSE)
    , m_ulLastFakeCallbackTime(0)
    , m_pFakeAudioCBTime(0)
    , m_pInDataPtr(0)
    , m_pOutDataPtr(0)
    , m_pPlayerResponse(0)
    , m_bFirstPlayAudio(TRUE)
    , m_uVolume(HX_INIT_VOLUME)
    , m_bMute(FALSE)
    , m_bAudioDeviceSupportsVolume(TRUE)
    , m_dBufEndTime((double) 0.)
    , m_bDisableWrite(FALSE)
    , m_bInPlayAudio(FALSE)
    , m_bInActualResume(FALSE)
    , m_dNumBytesWritten((double)0)
    , m_dNumBytesPlayed((double)0)
    , m_bInited(FALSE)
    , m_pAudioDev(0)
    , m_pCurrentAudioDev(NULL)
    , m_pReplacedAudioDev(NULL)
    , m_bReplacedDev(FALSE)
    , m_pPlayerList(0)
    , m_pHookList(NULL)
    , m_pAuxiliaryAudioBuffers(0)
    , m_pMutex(NULL)
    , m_pFinalHook(NULL)
    , m_bUseFinalHook(FALSE)
    , m_pCoreMutex(NULL)
    , m_uAskFromAudioDevice(0)
    , m_bDeferActualResume(FALSE)
    , m_pLastPausedPlayer(NULL)
    , m_bUsingReplacedDevice(FALSE)
    , m_bToBeRewound(FALSE)
    , m_ulLastRewindTimestamp(0)
    , m_uNumToBePushed(0)
    , m_bSessionBufferDirty(FALSE)
    , m_bPostMixHooksUpdated(FALSE)
    , m_pMPPSupport(NULL)
#if defined(HELIX_FEATURE_TIMELINE_WATCHER)
    , m_pTimeLineWatchers(NULL)
#endif    
{
    m_pFakeAudioCBTime                  = new Timeval;
    m_pInDataPtr                        = new HXAudioData;
    m_pOutDataPtr                       = new HXAudioData;
    m_pInDataPtr->pData                 = 0;
    m_pInDataPtr->ulAudioTime           = 0;
    m_pInDataPtr->uAudioStreamType      = STREAMING_AUDIO;
    m_pOutDataPtr->ulAudioTime          = 0;
    m_pOutDataPtr->pData                = 0;
    m_pOutDataPtr->uAudioStreamType     = STREAMING_AUDIO;

    /* Default value of Device format */
    m_DeviceFmt.uChannels       = 2;
    m_DeviceFmt.uBitsPerSample  = 16;
    m_DeviceFmt.ulSamplesPerSec = 16000;
    m_DeviceFmt.uMaxBlockSize   = 64000;
#ifdef HELIX_FEATURE_VOLUME
    m_pDeviceVolume = NULL;
#endif

#ifdef THREADS_SUPPORTED
    HXMutex::MakeMutex(m_pMutex);
#else
    HXMutex::MakeStubMutex(m_pMutex);
#endif
};


/************************************************************************
 *  Method:
 *              CHXAudioSession::~CHXAudioSession()
 *      Purpose:
 *              Destructor. Clean up and set free.
 */
CHXAudioSession::~CHXAudioSession()
{
    Close();
}

void
CHXAudioSession::Close(void)
{
    // Delete all player items
    if ( m_pPlayerList )
    {
        CHXAudioPlayer* p = 0;
        CHXSimpleList::Iterator lIter = m_pPlayerList->Begin();
        for (; lIter != m_pPlayerList->End(); ++lIter)
        {
            p = (CHXAudioPlayer*) (*lIter);
            if ( p )
                p->Release();
        }
        delete m_pPlayerList;
        m_pPlayerList = 0;
    }

    while (m_pHookList && m_pHookList->GetCount() > 0)
    {
        HXAudioHookInfo* pHookInfo = (HXAudioHookInfo*) m_pHookList->RemoveHead();
        pHookInfo->pHook->Release();
        delete pHookInfo;
    }

    HX_DELETE(m_pHookList);

    if (m_pAuxiliaryAudioBuffers)
    {
        while (m_pAuxiliaryAudioBuffers->GetCount() > 0)
        {
            HXAudioData* pAudioData =
                (HXAudioData*) m_pAuxiliaryAudioBuffers->RemoveHead();
            pAudioData->pData->Release();
            delete pAudioData;
        }

        delete m_pAuxiliaryAudioBuffers;
        m_pAuxiliaryAudioBuffers    = 0;
    }

    ResetSession();

    if( m_ulCallbackID && m_pScheduler)
    {
        m_pScheduler->Remove(m_ulCallbackID);
        m_ulCallbackID = 0;
    }

#ifdef HELIX_FEATURE_VOLUME
    if( m_pDeviceVolume )
    {
        m_pDeviceVolume->RemoveAdviseSink(this);
        HX_RELEASE(m_pDeviceVolume);
    }
#endif


    if (m_pDeviceCallback && m_pDeviceCallback->PendingID())
    {
        m_pScheduler->Remove(m_pDeviceCallback->PendingID());
    }
    HX_RELEASE(m_pDeviceCallback);

    HX_RELEASE(m_pScheduler);
    HX_RELEASE(m_pInterruptState);

#if defined(HELIX_FEATURE_PREFERENCES)
    if (m_pPreferences)
    {
        /* Store the last volume setting */
        IHXBuffer* pBuffer = new CHXBuffer;
        pBuffer->AddRef();
        pBuffer->SetSize(16);
        SafeSprintf((char*) pBuffer->GetBuffer(),16,"%d",(int) m_uVolume); /* Flawfinder: ignore */
        m_pPreferences->WritePref("Volume", pBuffer);
        pBuffer->Release();

#if defined(HELIX_FEATURE_MUTE_PREFERENCE)
        /* Store the last mute setting */
        IHXBuffer* pMuteBuffer = new CHXBuffer;
        pMuteBuffer->AddRef();
        pMuteBuffer->SetSize(16);
        SafeSprintf((char*) pMuteBuffer->GetBuffer(),16,"%d",(int) m_bMute);
        m_pPreferences->WritePref("Mute", pMuteBuffer);
        pMuteBuffer->Release();
#endif /* HELIX_FEATURE_MUTE_PREFERENCE */

        HX_RELEASE(m_pPreferences);
#ifdef _UNIX
        z_pIHXPrefs = NULL;
#endif
    }
#endif /* HELIX_FEATURE_PREFERENCES */


#if defined(HELIX_FEATURE_TIMELINE_WATCHER)
    //IHXTimelineManager
    while( m_pTimeLineWatchers && m_pTimeLineWatchers->GetCount() )
    {
        IHXTimelineWatcher* pWatcher = (IHXTimelineWatcher*)m_pTimeLineWatchers->RemoveHead();
        HX_RELEASE(pWatcher);
    }
    HX_DELETE(m_pTimeLineWatchers);

#endif
    
    HX_DELETE(m_pFakeAudioCBTime);
    HX_DELETE(m_pInDataPtr);
    HX_DELETE(m_pOutDataPtr);
    HX_RELEASE(m_pContext);
    HX_DELETE(m_pMutex);
    HX_RELEASE(m_pFinalHook);
    HX_RELEASE(m_pMPPSupport);
}
/////////////////////////////////////////////////////////////////////////
//  Method:
//      IUnknown::QueryInterface
//  Purpose:
//      Implement this to export the interfaces supported by your
//      object.
//

STDMETHODIMP CHXAudioSession::QueryInterface(REFIID riid, void** ppvObj)
{
    QInterfaceList  qiList[] =
        {
            { GET_IIDHANDLE(IID_IUnknown), (IUnknown*)(IHXAudioDeviceResponse*)this},
            { GET_IIDHANDLE(IID_IHXAudioDeviceResponse), (IHXAudioDeviceResponse*)this  },
            { GET_IIDHANDLE(IID_IHXAudioDeviceManager),  (IHXAudioDeviceManager*)this   },
            { GET_IIDHANDLE(IID_IHXAudioDeviceManager2), (IHXAudioDeviceManager2*)this  },
            { GET_IIDHANDLE(IID_IHXAudioPushdown),       (IHXAudioPushdown*)this        },
#ifdef HELIX_FEATURE_VOLUME
            { GET_IIDHANDLE(IID_IHXVolumeAdviseSink), (IHXVolumeAdviseSink*)this        },
#endif
#if defined(HELIX_FEATURE_AUDIO_POSTMIXHOOK)
            { GET_IIDHANDLE(IID_IHXAudioHookManager),    (IHXAudioHookManager*)this     },
#endif
#if defined(HELIX_FEATURE_RESAMPLER) && !defined (HELIX_CONFIG_FIXEDPOINT)
              { GET_IIDHANDLE(IID_IHXAudioResamplerManager), (IHXAudioResamplerManager*)this },
#endif
#if defined(HELIX_FEATURE_TIMELINE_WATCHER)
            { GET_IIDHANDLE(IID_IHXTimelineManager),      (IHXTimelineManager*)this       },
#endif
            { GET_IIDHANDLE(IID_IHXAudioPushdown2),      (IHXAudioPushdown2*)this       }
        };

    return ::QIFind(qiList, QILISTSIZE(qiList), riid, ppvObj);
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//      IUnknown::AddRef
//  Purpose:
//      Everyone usually implements this the same... feel free to use
//      this implementation.
//
STDMETHODIMP_(ULONG32) CHXAudioSession::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//      IUnknown::Release
//  Purpose:
//      Everyone usually implements this the same... feel free to use
//      this implementation.
//
STDMETHODIMP_(ULONG32) CHXAudioSession::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }

    delete this;
    return 0;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::SetVolume
 *      Purpose:
 *              Set device volume. This is the audio device volume.
 *
 */
void CHXAudioSession::SetVolume( const UINT16 uVolume)
{
    m_uVolume = uVolume;

    // only set the volume of not muted
    if (!m_bMute)
    {
        HX_ASSERT(m_pCurrentAudioDev || !m_bReplacedDev);
        _ConstructIfNeeded();
        if (m_pCurrentAudioDev)
        {
            m_pCurrentAudioDev->SetVolume(uVolume);
        }
    }
}

void CHXAudioSession::_ConstructIfNeeded()
{
    if (!m_pCurrentAudioDev)
    {
        CreateAudioDevice();
        if (!m_bAudioDeviceSupportsVolume)
        {
            ReleaseAudioDevice();
        }
    }
}


/************************************************************************
 *  Method:
 *              CHXAudioSession::GetVolume
 *      Purpose:
 *              Get device volume. This is the audio device volume.
 *
 */
UINT16 CHXAudioSession::GetVolume()
{
    if(!m_bMute)
    {
        HX_ASSERT(m_pCurrentAudioDev || !m_bReplacedDev);
        _ConstructIfNeeded();
        if (m_pCurrentAudioDev)
        {
            m_uVolume = m_pCurrentAudioDev->GetVolume();
        }
    }
    return m_uVolume;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::SetMute
 *      Purpose:
 *              Mute device volume. This is the audio device volume.
 *
 */
void CHXAudioSession::SetMute( const BOOL bMute)
{
    if (bMute != m_bMute)
    {
        m_bMute = bMute;

        UINT16 volLevel = (m_bMute ? 0 : m_uVolume);
        HX_ASSERT(m_pCurrentAudioDev || !m_bReplacedDev);
        _ConstructIfNeeded();
        if (m_pCurrentAudioDev)
        {
            m_pCurrentAudioDev->SetVolume( volLevel );
        }
    }
}




/************************************************************************
 *  Method:
 *              CHXAudioSession::Init
 *      Purpose:
 *              Setup the Audio Player list.
 */
HX_RESULT CHXAudioSession::Init(IUnknown* pContext)
{
    HX_RESULT   theErr  = HXR_OK;
    IHXBuffer* pBuffer = 0;

    if (!pContext)
    {
        theErr = HXR_INVALID_PARAMETER;
        goto cleanup;
    }

    m_pContext = pContext;
    m_pContext->AddRef();

#if defined(HELIX_FEATURE_PREFERENCES)
    // Get preferences interface and info..
    pContext->QueryInterface(IID_IHXPreferences, (void **) &m_pPreferences);

#ifdef _UNIX
    //Set up a global so we can read the ESDSupport pref
    //when we create the audio device
    z_pIHXPrefs = m_pPreferences;
#endif
#endif /* HELIX_FEATURE_PREFERENCES */

    if (HXR_OK != pContext->QueryInterface(IID_IHXScheduler,
                            (void**) &m_pScheduler))
    {
        theErr = HXR_INVALID_PARAMETER;
        goto cleanup;
    }

    pContext->QueryInterface(IID_IHXInterruptState, (void**) &m_pInterruptState);

    // Create audio player list.
    m_pPlayerList = new CHXSimpleList;
    if (!m_pPlayerList || !m_pPlayerList->IsPtrListValid())
    {
        theErr = HXR_OUTOFMEMORY;
        goto cleanup;
    }

#if defined(HELIX_FEATURE_PREFERENCES)
    if (m_pPreferences)
    {
        ReadPrefINT32(m_pPreferences, "MinimumInitalPushdown", m_ulMinimumPushdown);
        ReadPrefINT32(m_pPreferences, "IdealMinimumInitalPushdown", m_ulIdealMinimumPushdown);

        if (m_ulIdealMinimumPushdown > m_ulMinimumPushdown)
        {
            m_ulMinimumPushdown = m_ulIdealMinimumPushdown;
        }
    }
#endif /* HELIX_FEATURE_PREFERENCES */

    // Create a device volume interface.
    if ( !theErr )
    {
#if defined(HELIX_FEATURE_VOLUME)
#if defined(HELIX_FEATURE_PREFERENCES)
        if (m_pPreferences)
        {
            BOOL bOpenAudioDeviceOnPlayback = TRUE;

            ReadPrefBOOL(m_pPreferences, "OpenAudioDeviceOnPlayback", bOpenAudioDeviceOnPlayback);

            if (!bOpenAudioDeviceOnPlayback)
            {
                // rgammon 12/17/03
                // Create audio device on init if OpenAudioDeviceOnPlayback is
                // false. This means that we will be able to query the volume
                // successfully on startup. It also means that if there are
                // errors opening the audio device, they will show up at
                // startup. Some players (the windows player, for example),
                // save the system volume at shutdown and use that volume for
                // the ui on startup.
                CreateAudioDevice();

                m_uVolume = GetVolume();
            }
        }

        if (m_pPreferences)
        {
            if (ReadPrefINT16(m_pPreferences, "Volume", m_uVolume) != HXR_OK)
            {
                BOOL bUseDS = FALSE;
                ReadPrefBOOL(m_pPreferences, "UseDirectSound", bUseDS);
                if(bUseDS)
                {
                    m_uVolume = HX_MAX_VOLUME;
                }
            }
#if defined(HELIX_FEATURE_MUTE_PREFERENCE )
            ReadPrefBOOL(m_pPreferences, "Mute", m_bMute);
#endif /* HELIX_FEATURE_MUTE_PREFERENCE */

        }
#endif /* HELIX_FEATURE_PREFERENCES */

        m_pDeviceVolume = (IHXVolume*)new CHXVolume;
        if( m_pDeviceVolume )
        {
            m_pDeviceVolume->AddRef();
            m_pDeviceVolume->SetVolume(m_uVolume);
#if defined(HELIX_FEATURE_MUTE_PREFERENCE )
            m_pDeviceVolume->SetMute(m_bMute);
#endif /* HELIX_FEATURE_MUTE_PREFERENCE */
            m_pDeviceVolume->AddAdviseSink((IHXVolumeAdviseSink*)this);
        }
        else
            theErr = HXR_OUTOFMEMORY;

#endif /* HELIX_FEATURE_VOLUME */
    }

cleanup:
    return theErr;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::CreateAudioPlayer
 *      Purpose:
 *       The RMA session object calls this to create an audio player. Each
 *       audio player represents a unique time-line.
 */
HX_RESULT CHXAudioSession::CreateAudioPlayer
(
    CHXAudioPlayer**  ppAudioPlayer
)
{
    m_pMutex->Lock();

    HX_RESULT theErr = HXR_OK;

    // Create a new audio player.
    *ppAudioPlayer= 0;
    *ppAudioPlayer = new CHXAudioPlayer( this );
    if ( !(*ppAudioPlayer) )
        theErr = HXR_OUTOFMEMORY;

    // Add new player to player list.
    if (!theErr)
    {
        theErr = _CreateAudioPlayer(ppAudioPlayer);
    }

    m_pMutex->Unlock();

    return theErr;
}

HX_RESULT
CHXAudioSession::_CreateAudioPlayer(CHXAudioPlayer** ppAudioPlayer)
{
    HX_RESULT   theErr = HXR_OK;

    // Add new player to player list.
    // Setup internal lists, etc.
    theErr = (*ppAudioPlayer)->InitializeStructures();

    if (!theErr)
    {
        // This one to keep it around.
        (*ppAudioPlayer)->AddRef();

        // This one to return back to the caller of CreateAudioPlayer.
        (*ppAudioPlayer)->AddRef();
    }

    // Add new player to player list.
    if ( !theErr && m_pPlayerList )
    {
        m_pPlayerList->AddTail((void*) *ppAudioPlayer);
    }

    if (theErr && *ppAudioPlayer)
    {
        /* Destructor is private. so this is the only way of destructing it */
        (*ppAudioPlayer)->AddRef();
        (*ppAudioPlayer)->Release();

        *ppAudioPlayer = 0;
    }

    return theErr;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::CreateAudioPlayer
 *      Purpose:
 *       The RMA session object calls this to create an audio player. Each
 *       audio player represents a unique time-line.
 */
HX_RESULT CHXAudioSession::CloseAudioPlayer
(
    CHXAudioPlayer*  pAudioPlayer
)
{
    m_pMutex->Lock();

    if ( m_pPlayerList )
    {
        LISTPOSITION lPosition = NULL;
        lPosition = m_pPlayerList->Find(pAudioPlayer);
        if (lPosition)
        {
            m_pPlayerList->RemoveAt(lPosition);
            pAudioPlayer->Close();
            _NotifyTimelineWatchers( TLW_CLOSE );
            pAudioPlayer->Release();
        }
    }

    m_pMutex->Unlock();
    return HXR_OK;
}


/* ***********************************************************************
 *  Method:
 *              CHXAudioSession::Setup
 *      Purpose:
 *              Create the audio buffer..
 */
HX_RESULT CHXAudioSession::Setup(BOOL bHasStreams)
{
    HX_RESULT theErr = HXR_OK;

    // A new audio player may start while an existing player is
    // already playing.
    if ( m_bInited )
        return HXR_OK;

    /* Only do all of this if there are audio streams... */
    m_bHasStreams = bHasStreams;
    if (m_bHasStreams)
    {
        // Get the audio device format
        // NOTE: The order of these function calls is important.
        // Specifically, the GetDeviceFormat() must precede any of
        // these calls because GetDeviceFormat() determines the
        // final device audio format.
        if (!theErr)
            theErr = GetDeviceFormat();

        // Create the playback buffers
        /* We still need to create playback buffers since we will use the
         * fake timeline if the presentation has atleast one media type other
         * than audio
         */
        if (!theErr || theErr == HXR_AUDIO_DRIVER)
        {
            CreatePlaybackBuffer();
        }

        // Reset the number of blocks we've written
        m_ulBlocksWritten = 0;

        // Open the audio device only if DisableWrite is OFF
        /* This probably needs to be moved at the top so that
         * when second player comes in and we are already intialized,
         * we check for new value of disablewrite again
         */
        CheckDisableWrite();

        m_bUseFinalHook         = FALSE;

        if (!theErr && !m_bDisableWrite)
        {
            theErr = OpenDevice();
        } /* If disable wirte is ON, release the audio device */
        else if (!theErr)
        {
            m_pAudioDev = 0;
        }

        /* If the audio device is busy, check if we have
         * anything other than audio in the presentation.
         * If TRUE, play silence so that the rest of the
         * presentation can be played.
         */
        if (theErr == HXR_AUDIO_DRIVER && !m_bDisableWrite)
        {
            if (!IsAudioOnlyTrue())
            {
                m_bDisableWrite = TRUE;
                m_pAudioDev         = 0;
                theErr      = HXR_OK;
            }
        }
    }

    m_bInited = (!theErr) ? TRUE : FALSE;

    if (!theErr && m_pAudioDev && m_pHookList)
    {
        InitHooks();
    }

    if (!theErr && m_pAudioDev && m_pFinalHook)
    {
        ProcessAudioHook(ACTION_ADD, m_pFinalHook);
    }

    if(m_pContext)
    {
        HX_RELEASE(m_pMPPSupport);
        m_pContext->QueryInterface(IID_IHXMultiPlayPauseSupport, (void**)&m_pMPPSupport);
    }

    return theErr;
}

HX_RESULT
CHXAudioSession::OpenDevice()
{
    HX_RESULT       theErr = HXR_OK;
    HXAudioFormat  audioFormat;

    if (m_pFinalHook)
    {
        m_bUseFinalHook = TRUE;

        if (HXR_OK != ProcessAudioHook(ACTION_CHECK, m_pFinalHook))
        {
            m_bUseFinalHook = FALSE;
        }

        if (m_bUseFinalHook)
        {
            memcpy( &audioFormat, &m_ActualDeviceFmt, sizeof(HXAudioFormat));
            theErr = m_pFinalHook->OnInit(&audioFormat);
        }
    }

    if (!theErr && m_pFinalHook && m_bUseFinalHook)
    {
        m_bUseFinalHook = TRUE;
        /* Did the hook change the data format? */
        if( 0!=memcmp(&audioFormat, &m_ActualDeviceFmt, sizeof(HXAudioFormat)))
        {
            memcpy( &m_BeforeHookDeviceFmt, &m_ActualDeviceFmt, sizeof(HXAudioFormat));
            memcpy( &m_ActualDeviceFmt, &audioFormat, sizeof(HXAudioFormat));
        }
    }
    else
    {
        m_bUseFinalHook = FALSE;
    }

    theErr = OpenAudio();

    if (theErr && m_pFinalHook && m_bUseFinalHook)
    {
        /* Looks like the audio device does not support the format
         * specified by the final Hook
         * Revert back to the original format and try again
         */
        memcpy( &m_ActualDeviceFmt, &m_BeforeHookDeviceFmt, sizeof(HXAudioFormat));
        m_bUseFinalHook         = FALSE;
        theErr = OpenAudio();
    }

    return theErr;
}


/* ***********************************************************************
 *  Method:
 *              CHXAudioSession::GetDeviceFormat
 *      Purpose:
 *              Determine the device format for this session.
 *              The session object needs to resolve the device format
 *              among multiple players.
 */
HX_RESULT CHXAudioSession::GetDeviceFormat()
{
    HX_RESULT       theErr          = HXR_OK;
    UINT16          uOrigSampleRate = 0;
    CHXAudioPlayer* p               = NULL;
    UINT16          bAutoUpsampling = FALSE;
    HXAudioFormat   audioFmt;

    // We no longer force audio device in stereo mode.  However we
    // still try to open it in 16-bit mode since all of our processing
    // is done in 16 bit.
    m_DeviceFmt.uBitsPerSample  = 16;

    //Just grab the first players stats to use as maximums.
    LISTPOSITION lp = m_pPlayerList->GetHeadPosition();
    while(lp)
    {
        p = (CHXAudioPlayer*) m_pPlayerList->GetNext(lp);
        if(0!=p->GetStreamCount())
        {
            p->GetFormat( &audioFmt );
            m_DeviceFmt.uChannels       = audioFmt.uChannels;
            m_DeviceFmt.ulSamplesPerSec = audioFmt.ulSamplesPerSec;
            m_DeviceFmt.uMaxBlockSize   = audioFmt.uMaxBlockSize;
            break;
        }
    }

    //Now loop through the rest of the players and find all the
    //maximums.
    while(lp)
    {
        p = (CHXAudioPlayer*) m_pPlayerList->GetNext(lp);
        if( 0 != p->GetStreamCount() )
        {
            p->GetFormat( &audioFmt );
            m_DeviceFmt.uChannels       = max(m_DeviceFmt.uChannels,
                                              audioFmt.uChannels);
            m_DeviceFmt.ulSamplesPerSec = max(m_DeviceFmt.ulSamplesPerSec,
                                              audioFmt.ulSamplesPerSec);
            m_DeviceFmt.uMaxBlockSize   = max(m_DeviceFmt.uMaxBlockSize,
                                              audioFmt.uMaxBlockSize);
        }
    }

    // turn on the default upsampling to 44K only on IX86 platforms
    // which support MMX
    // XXXgfw this also uses more memory for each block we push down
    // XXXgfw to the audio device. You might not want it on MIN_HEAP
    // XXXgfw kind of MMX devices, if there are any.
#if defined(_M_IX86)
    ReadPrefINT16(m_pPreferences, "AutoAudioUpsampling", bAutoUpsampling );
#endif
    if(bAutoUpsampling)
    {
        //force 44khz as our first attempt to open audio device
        uOrigSampleRate = (UINT16)m_DeviceFmt.ulSamplesPerSec;
        m_DeviceFmt.ulSamplesPerSec = 44100;
    }
#if defined(HELIX_FEATURE_PREFERENCES)
    else
    {
        UINT16 ulSamplesPerSecPreference = 0;
        ReadPrefINT16(m_pPreferences, "AudioDeviceSamplesPerSec", ulSamplesPerSecPreference );
        if(ulSamplesPerSecPreference)
        {
            uOrigSampleRate = (UINT16)m_DeviceFmt.ulSamplesPerSec;
            m_DeviceFmt.ulSamplesPerSec = ulSamplesPerSecPreference;
        }
    }
#endif /* HELIX_FEATURE_PREFERENCES */

    //Start negotiating with the device. Generate a table that will
    //drive the different formats we want to try.  Start with the
    //native rate (and any mods from the pref stuff above) and go up
    //in samplerate. If that fails, go down in sample rate.
    const int nNumberOfRates = sizeof(z_anValidSampleRates)/sizeof(z_anValidSampleRates[0]);
    //Total number of table entries per sample rate will be:
    //nNumberOfRates*4 (mono/16, mono/8, stereo/16, stereo/8) plus
    //native format + user defined samplerate entry.
    const int      nTmp       = nNumberOfRates*4+2;
    unsigned short nTableSize = 0;
    tableEntry* table = new tableEntry[nTmp];

    HX_ASSERT(table);
    if( NULL == table )
        return HXR_OUTOFMEMORY;


    //First entry is always our native format from above with any
    //samplerate changes the user made via prefs.
    table[nTableSize++].set( (UINT16)m_DeviceFmt.ulSamplesPerSec,
                             (UINT8)m_DeviceFmt.uChannels,
                             (UINT8)m_DeviceFmt.uBitsPerSample
                             );

    //Second entry is always the above with the clip's original
    //sample rate, if we changed it.
    if( uOrigSampleRate )
        table[nTableSize++].set(uOrigSampleRate,
                                (UINT8)m_DeviceFmt.uChannels,
                                (UINT8)m_DeviceFmt.uBitsPerSample
                                );

    //Now generate the rest of the format table....
    const UINT8 usNativeChannel = (UINT8)m_DeviceFmt.uChannels;
    const UINT8 usAltChannel    = (2==m_DeviceFmt.uChannels)?1:2;
    const UINT8 usNativeBits    = (UINT8)m_DeviceFmt.uBitsPerSample;
    const UINT8 usAltBits       = (8==m_DeviceFmt.uBitsPerSample)?16:8;

    //First use all equal or higher sample rates.
    short nIdx = 0;
    while( nIdx<nNumberOfRates )
    {
        UINT16 usRate = z_anValidSampleRates[nIdx];
        if( usRate >= m_DeviceFmt.ulSamplesPerSec )
        {
            table[nTableSize++].set(usRate, usNativeChannel, usNativeBits );
            table[nTableSize++].set(usRate, usAltChannel,    usNativeBits );
            table[nTableSize++].set(usRate, usNativeChannel, usAltBits  );
            table[nTableSize++].set(usRate, usAltChannel,    usAltBits  );
        }
        nIdx++;
    }
    //Now all the samle rates lower then the native rate.
    nIdx = nNumberOfRates-1;
    while( nIdx>=0)
    {
        UINT16 usRate = z_anValidSampleRates[nIdx];
        if( usRate < m_DeviceFmt.ulSamplesPerSec )
        {
            table[nTableSize++].set(usRate, usNativeChannel, usNativeBits );
            table[nTableSize++].set(usRate, usAltChannel,    usNativeBits );
            table[nTableSize++].set(usRate, usNativeChannel, usAltBits  );
            table[nTableSize++].set(usRate, usAltChannel,    usAltBits  );
        }
        nIdx--;
    }

    //Now loop through our table and find a supported format.
    nIdx = 0;
    theErr = HXR_FAIL;
    while( FAILED(theErr) && nIdx<nTableSize)
    {
        m_DeviceFmt.ulSamplesPerSec = table[nIdx].usSampleRate;
        m_DeviceFmt.uChannels       = table[nIdx].usChannels;
        m_DeviceFmt.uBitsPerSample  = table[nIdx].usBits;
        theErr = CheckAudioFormat(&m_DeviceFmt);
        nIdx++;
    }

    //We still need to create playback buffers since we will use the
    //fake timeline if the presentation has atleast one media type
    //other than audio
    //XXXgfw this code below needs to be looked at. I Don't want to
    //touch it now for fear of breaking something that will take
    //a long time to fix.
    if (!theErr || theErr == HXR_AUDIO_DRIVER)
    {
        m_ActualDeviceFmt = m_DeviceFmt;

        //All the calculations are done for 16 bit stereo. There are
        //VERY FEW sound cards out there which do not support 16 bit
        //stereo. They will incur a high performace hit because of
        //possible unnecessary up/down conversion. For now we will
        //live with that.
        //XXXgfw wrong. lots of handhelds/phones don't do 16bit-2
        //channel output.
        m_DeviceFmt.uBitsPerSample  = 16;

        m_BeforeHookDeviceFmt = m_ActualDeviceFmt;
    }

    HX_VECTOR_DELETE(table);
    return theErr;
}


/************************************************************************
 *  Method:
 *              CHXAudioSession::CheckAudioFormat
 *      Purpose:
 *       The audio player calls this to check its audio format with the
 *       the audio device.
 */
HX_RESULT CHXAudioSession::CheckAudioFormat
(
    HXAudioFormat*    pAudioFormat
)
{
    HX_RESULT theErr = HXR_OK;

    if (!m_pAudioDev)
    {
        CreateAudioDevice();
        m_pAudioDev = m_pCurrentAudioDev;
    }

    if (m_pAudioDev)
    {
        theErr = m_pAudioDev->CheckFormat(pAudioFormat);
        /* Any error from audio device other than memory error is
         * returned as HXR_AUDIO_DRIVER
         */
        if (theErr != HXR_OK && theErr != HXR_OUTOFMEMORY)
        {
            theErr = HXR_AUDIO_DRIVER;
        }
    }

    return theErr;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::PlayAudio
 *      Purpose:
 *       The player object call this to play audio. This method is called
 *       again in the playback response function.
 */
HX_RESULT CHXAudioSession::PlayAudio(UINT16 uNumBlocks)
{
    HX_RESULT theErr        = HXR_OK;
    BOOL      bDisableWrite = FALSE;

    if ( !m_bInited )
        return theErr;

    if (m_bInPlayAudio)
    {
        return HXR_OK;
    }

    m_pMutex->Lock();

    if (m_bToBeRewound)
    {
        theErr = Rewind();
        goto exit;
    }

    m_bInPlayAudio = TRUE;

    if (m_pAuxiliaryAudioBuffers &&
        m_pAuxiliaryAudioBuffers->GetCount() > 0 && m_pAudioDev && !m_bDisableWrite)
    {
        if (HXR_OK == ProcessAudioDevice(ACTION_CHECK, m_pAudioDev))
        {
            /* Try to stuff in as much backlog as possible */
            while (!theErr && m_pAuxiliaryAudioBuffers->GetCount() > 0)
            {
                HXAudioData* pAudioData =
                    (HXAudioData*) m_pAuxiliaryAudioBuffers->GetHead();

                // Write session audio data to device.
                theErr = m_pAudioDev->Write(pAudioData);
                if( theErr == HXR_OUTOFMEMORY )
                {
                    goto exit;
                }

                if (!theErr)
                {
                    m_ulBlocksWritten++;
                    m_dNumBytesWritten  += pAudioData->pData->GetSize();

                    m_pAuxiliaryAudioBuffers->RemoveHead();
                    pAudioData->pData->Release();
                    delete pAudioData;
                }
                /*All other error codes are translated into audio driver error*/
                else if (theErr != HXR_OUTOFMEMORY && theErr != HXR_WOULD_BLOCK)
                {
                    theErr = HXR_AUDIO_DRIVER;
                }
            }
        }
    }

    // If we have audio streams then play audio.
    if (!theErr && m_bHasStreams)
    {
        // Push down at least 3 secs of audio.
        UINT16 uPush = uNumBlocks;
        if (m_bFirstPlayAudio)
        {
            uPush = (UINT16) m_ulMinBlocksTobeQueued;
        }

        HXAudioData audioData;
        CHXAudioPlayer* pPlayer = 0;
        CHXAudioStream* pStream = 0;
        CHXSimpleList*  pStreamList = 0;
#if defined(HELIX_FEATURE_VOLUME) || defined(HELIX_FEATURE_MIXER)
        UINT16  uPlayerVolume = HX_INIT_VOLUME;
#endif
        UCHAR*  pMixBuffer = 0;
        UCHAR*  pPlayerBuf = NULL;
        UCHAR*  pSessionBuf = NULL;
        IHXBuffer* pMixIHXBuffer = NULL;
        BufType bufType = BUFFER_NONE;

        for (UINT16 i = 0; !theErr && i < uPush; i++ )
        {
            m_uNumToBePushed = uPush - i;
            m_bSessionBufferDirty = FALSE; // only used for multi-player case

            UINT32  ulNumBytesWritten = m_ulBytesPerGran;
            BOOL    bAtLeastOnePlayerActive = FALSE;

            theErr = m_pSessionBuf->SetSize(m_ulBytesPerGran);
            if( theErr == HXR_OUTOFMEMORY )
            {
                theErr = HXR_OUTOFMEMORY;
                goto exit;
            }

            pSessionBuf = m_pSessionBuf->GetBuffer();

            // Zero session buffer.
            //memset(pSessionBuf, 0, HX_SAFESIZE_T(m_ulBytesPerGran));

            // Get each player
            pPlayer = 0;
            CHXSimpleList::Iterator lIter = m_pPlayerList->Begin();
            for (; lIter != m_pPlayerList->End(); ++lIter)
            {
                BOOL bStalled = FALSE;
                pPlayer = (CHXAudioPlayer*) (*lIter);
                if (pPlayer->GetStreamCount() == 0 ||
                    pPlayer->IsDonePlayback() ||
                    pPlayer->GetState() != E_PLAYING)
                {
                    continue;
                }

                bAtLeastOnePlayerActive = TRUE;

                if (m_pPlayerList->GetCount() == 1)
                {
                    pMixIHXBuffer = m_pSessionBuf;
                    bufType = BUFFER_SESSION;
                }
                else
                {
                    if (!m_pPlayerBuf)
                    {
                        m_pPlayerBuf = new CHXBuffer;
                        m_pPlayerBuf->AddRef();
                    }

                    m_pPlayerBuf->SetSize(m_ulBytesPerGran);

                    pPlayerBuf = m_pPlayerBuf->GetBuffer();
                    // Zero play buffer.
//                  memset(pPlayerBuf, 0, HX_SAFESIZE_T(m_ulBytesPerGran));
                    pMixIHXBuffer = m_pPlayerBuf;
                    bufType = BUFFER_PLAYER;
                }

                pMixBuffer = pMixIHXBuffer->GetBuffer();
                BOOL bIsMixBufferDirty = FALSE;
                BOOL bMayNeedToRollbackTimestamp = FALSE;

                if (pPlayer->GetState() == E_PLAYING)
                {
                    UINT32  ulBufTime = 0;
                    // Get each stream associated with this player
                    pStreamList = pPlayer->GetStreamList();
                    if (pStreamList)
                    {
                    CHXSimpleList::Iterator lIter = pStreamList->Begin();
                    for (; lIter != pStreamList->End(); ++lIter)
                    {
                        pStream = (CHXAudioStream*) (*lIter);
                        pStream->m_bMayNeedToRollbackTimestamp = FALSE;

                        // don't mix paused audio streams
                        if (pStream->GetState() != E_PAUSED)
                        {
                            theErr = pStream->MixIntoBuffer( pMixBuffer, m_ulBytesPerGran, ulBufTime, bIsMixBufferDirty);

                            // so as not to trigger ReallyNeedData
                            // since one of the streams internal m_llLastwritetime
                            // has been updated even though this flag is set to FALSE.
#if 0
                            if (!bIsMixBufferDirty &&
                                (theErr == HXR_OK || theErr == HXR_NO_DATA))
                            {
                                bIsMixBufferDirty = TRUE;
                                ::memset(pMixBuffer, 0, HX_SAFESIZE_T(m_ulBytesPerGran));
                            }
#endif

                            if (theErr == HXR_NO_DATA)
                            {
                                pStream->m_bMayNeedToRollbackTimestamp = TRUE;
                                bMayNeedToRollbackTimestamp = TRUE;
                                theErr = HXR_OK;
                                continue;
                            }

                            if (theErr == HXR_FAIL)
                            {
                                theErr = HXR_OK;
                                goto exit;
                            }

                            if (theErr == HXR_OUTOFMEMORY)
                            {
                                goto exit;
                            }

                            if (theErr == HXR_WOULD_BLOCK)
                            {
#ifdef _RAHULDEBUG
                                {
                                    char str[255]; /* Flawfinder: ignore */
                                    ::sprintf(str, "Num to be pushed remaining: %lu\n", m_uNumToBePushed); /* Flawfinder: ignore */
                                    OutputDebugString(str);
                                }
#endif

                                if (bMayNeedToRollbackTimestamp)
                                {
                                    bMayNeedToRollbackTimestamp = FALSE;
                                    lIter = pStreamList->Begin();
                                    for (; lIter != pStreamList->End(); ++lIter)
                                    {
                                        pStream = (CHXAudioStream*) (*lIter);
                                        if (pStream->m_bMayNeedToRollbackTimestamp)
                                        {
                                            pStream->m_bMayNeedToRollbackTimestamp = FALSE;
                                            pStream->RollBackTimestamp();
                                        }
                                    }
                                }

                                goto handlewouldblock;
                            }
                        }

                        if (pPlayer->GetState() != E_PLAYING)
                        {
                            /* We should keep the last buffer around and the last stream
                             * to be mixed again...TBD XXX Rahul
                             */
                            //pPlayer->SetLastMixedBuffer(pMixBuffer, pStream);
                            bStalled = TRUE;
                            break;
                        }
                    }
                    } //if (pStreamList)

                    /* This pause may have happended due to ondrynotification */
                    if (m_bPaused || m_bStoppedDuringPause)
                    {
                        /* This would happen ONLY IF THERE IS ONE AUDIO PLAYER
                         * and that has been paused. So simply break
                         */
                        goto exit;
                        //break;
                    }

                    /* hmmm... looks like there are more than one audio player.
                     * continue with the next one
                     */
                    if (bStalled)
                    {
                        continue;
                    }

                    /* If the mixer buffer was not used, make sure it is initialized
                     * to silence since we pass it to post process hooks
                     */
                    if (!bIsMixBufferDirty)
                    {
//{FILE* f1 = ::fopen("e:\\audioses.txt", "a+"); ::fprintf(f1, "%lu\t%p\tsilence in mix buffer\n", HX_GET_BETTERTICKCOUNT(), this);::fclose(f1);}
                        ::memset(pMixBuffer, 0, HX_SAFESIZE_T(m_ulBytesPerGran));
                    }

#if defined(HELIX_FEATURE_VOLUME) && defined(HELIX_FEATURE_MIXER)
                    // Apply Player volume to buffer; do this before we call
                    // the post mix hooks.
                    uPlayerVolume = pPlayer->GetVolume();

                    if (uPlayerVolume != 100 && bIsMixBufferDirty)
                    {
                        CHXMixer::ApplyVolume(pMixBuffer, m_ulBytesPerGran, uPlayerVolume, m_DeviceFmt.uBitsPerSample);
                    }
#endif /* HELIX_FEATURE_VOLUME && HELIX_FEATURE_MIXER */

                    // Give data to this AudioPlayer's post mix hooks
                    // (do they want 8 or 16 bit?)
                    BOOL bChanged = FALSE;
                    ProcessPostMixHooks(pPlayer, pMixIHXBuffer, &bDisableWrite, ulBufTime, bChanged);

                    /*
                     * If the mixer buffer changed (because of a post mix hook)
                     * make sure to point the player/session buffer to this
                     * modified buffer
                     */
                    if (bChanged)
                    {
                        pMixBuffer = pMixIHXBuffer->GetBuffer();

                        if (bufType == BUFFER_PLAYER)
                        {
                            m_pPlayerBuf = pMixIHXBuffer;
                            pPlayerBuf = pMixIHXBuffer->GetBuffer();
                        }
                        else
                        {
                            m_pSessionBuf = pMixIHXBuffer;
                            pSessionBuf = pMixIHXBuffer->GetBuffer();
                        }
                    }
                }

#if defined(HELIX_FEATURE_MIXER)
                // Don't mix if volume is 0.
                // Don't mix if this player has disabled device write.
                // Don't mix if there is only one player since we would have
                // written data into session buf instead of player buffer
                if (m_pPlayerList->GetCount() > 1 && uPlayerVolume > 0 && !bDisableWrite)
                {
                    /* We always set a volume of 100 since we have already applied volume
                     * to player buffer
                     */
                    CHXMixer::MixBuffer( pPlayerBuf, pSessionBuf,
                                m_ulBytesPerGran, FALSE, 100, m_DeviceFmt.uBitsPerSample, m_bSessionBufferDirty);
                }
#endif /* HELIX_FEATURE_MIXER */

                pPlayer->UpdateLastWriteTime(m_ulGranularity);
            }

            if (!bAtLeastOnePlayerActive)
            {
                goto exit;
            }

            /* did we ever write to the session buffer ? */
            if (m_pPlayerList->GetCount() > 1 && !m_bSessionBufferDirty)
            {
//{FILE* f1 = ::fopen("e:\\audioses.txt", "a+"); ::fprintf(f1, "%lu\t%p\tsilence in session buffer\n", HX_GET_BETTERTICKCOUNT(), this);::fclose(f1);}
                ::memset(pSessionBuf, 0, HX_SAFESIZE_T(m_ulBytesPerGran));
            }

            // This increments with each buffered played.
            m_dBufEndTime   += m_dGranularity;

            // Set the session buffer to the IRMA buffer.
            audioData.pData       = m_pSessionBuf;
            audioData.ulAudioTime = (ULONG32)m_dBufEndTime;

            if (m_pAudioDev && !m_bDisableWrite)
            {
                /* are we dealing with a f*%$'ed up sound card */
                if ((m_BeforeHookDeviceFmt.uChannels == 1 && m_DeviceFmt.uChannels == 2)||
                    m_BeforeHookDeviceFmt.uBitsPerSample == 8)
                {
                    ConvertTo8BitAndOrMono(&audioData);
                }

                if (m_pFinalHook && m_bUseFinalHook)
                {
                    if (HXR_OK == ProcessAudioHook(ACTION_CHECK, m_pFinalHook))
                    {
                        m_pOutDataPtr->pData        = NULL;
                        m_pOutDataPtr->ulAudioTime          = audioData.ulAudioTime;
                        m_pOutDataPtr->uAudioStreamType = audioData.uAudioStreamType;

                        m_pFinalHook->OnBuffer(&audioData, m_pOutDataPtr);

                        HX_ASSERT(m_pOutDataPtr->pData);
                        if (m_pOutDataPtr->pData)
                        {
                            HX_RELEASE(audioData.pData);
                            m_pSessionBuf = audioData.pData = m_pOutDataPtr->pData;
                        }
                        else
                        {
                            /* This is a screwed up Hook. Disable it */
                            m_bUseFinalHook = FALSE;
                        }
                    }
                }

                if (m_pHookList)
                {
                    ProcessHooks(&audioData);
                }

                ulNumBytesWritten    = audioData.pData->GetSize();
                if (HXR_OK == ProcessAudioDevice(ACTION_CHECK, m_pAudioDev))
                {
                    // Write session audio data to device.
                    theErr = m_pAudioDev->Write(&audioData);
                    if( theErr == HXR_OUTOFMEMORY )
                    {
                        goto exit;
                    }
                }

                if (theErr == HXR_WOULD_BLOCK)
                {
                    HXAudioData* pAudioData     = new HXAudioData;
                    pAudioData->pData           = audioData.pData;
                    pAudioData->pData->AddRef();
                    pAudioData->ulAudioTime     = audioData.ulAudioTime;
                    pAudioData->uAudioStreamType= audioData.uAudioStreamType;

                    // Create auxiliary buffer list, if one is not already created
                    if (!m_pAuxiliaryAudioBuffers)
                    {
                        m_pAuxiliaryAudioBuffers = new CHXSimpleList;
                    }
                    if( NULL == m_pAuxiliaryAudioBuffers->AddTail(pAudioData) )
                    {
                        theErr = HXR_OUTOFMEMORY;
                        goto exit;
                    }

                    HX_RELEASE(m_pSessionBuf);
                }
                /* Any error from audio device other than memory error is
                 * returned as HXR_AUDIO_DRIVER
                 */
                if (theErr != HXR_OK && theErr != HXR_WOULD_BLOCK &&
                    theErr != HXR_OUTOFMEMORY)
                {
                    theErr = HXR_AUDIO_DRIVER;
                }
            }

            if (!theErr)
            {
                m_ulBlocksWritten++;
                m_dNumBytesWritten  += ulNumBytesWritten;
            }

            // So this function is good in theory, but in practice we find in
            // heap-optimized mode it is not necessary, and it leads to
            // unnecessary heap fragmentation.
#if !defined(HELIX_CONFIG_MIN_HEAP_FRAG)
            theErr = CheckForBufferReuse();
#endif
        }  // for loop
    }     //  end if we have audio streams

handlewouldblock:
    // mask this error
    if (theErr == HXR_WOULD_BLOCK)
    {
        theErr = HXR_OK;
    }

    // If we do not have audio.. OR  if we do have audio but
    // we have disabled writing to the device, then we need to
    // fake the timeline.
    if (!theErr && !m_ulCallbackID && (!m_bHasStreams || m_bDisableWrite))
    {
        if (m_bFirstPlayAudio)
        {
            // First time thru, we initialize callback time.
            HXTimeval lTime = m_pScheduler->GetCurrentSchedulerTime();
            m_pFakeAudioCBTime->tv_sec = lTime.tv_sec;
            m_pFakeAudioCBTime->tv_usec = lTime.tv_usec;

            m_ulIncreasingTimer = 0;
            m_ulLastFakeCallbackTime    = HX_GET_TICKCOUNT();

            *m_pFakeAudioCBTime += (int) (m_ulGranularity*1000);
        }
        m_bFakeAudioTimeline =  TRUE;
        m_ulCallbackID = m_pScheduler->RelativeEnter( this, m_ulGranularity);
        if (m_bFirstPlayAudio)
        {
            OnTimeSync(m_ulIncreasingTimer);
        }
    }
    else if (!theErr && !m_ulCallbackID && m_bHasStreams && !m_bDisableWrite)
    {
        m_bFakeAudioTimeline =  FALSE;
        m_ulCallbackID = m_pScheduler->RelativeEnter(this, m_ulGranularity*9/10);

#if 0   // XXX HP don't send OnTimeSync() untill we resume the audio device
        // the following logic caused OnTimeSync() sent to video renderer before the audio
        // timeline is started after seeking, as a consequence, the A/V could be out of
        // sync, video could be frozen for short period time in order to wait the audio
        // timeline to catch up
        if (m_bFirstPlayAudio)
        {
            OnTimeSync(m_ulIncreasingTimer);
        }
#endif
    }

exit:
    m_bInPlayAudio      = FALSE;

    // can only happen in multi-player pause/resume/stop case
    if (m_bDeferActualResume && theErr != HXR_OUTOFMEMORY)
    {
        m_bDeferActualResume = FALSE;
        theErr = ActualResume();
    }

    m_bFirstPlayAudio   = FALSE;

    m_pMutex->Unlock();

    return theErr;
}

HX_RESULT
CHXAudioSession::CheckForBufferReuse()
{
    if (m_pSessionBuf)
    {
        m_pSessionBuf->AddRef();
        if (m_pSessionBuf->Release() > 1)
        {
            /*
             * Cannot use this buffer the next time
             * release our reference and  create a new one
             */
            m_pSessionBuf->Release();

            m_pSessionBuf = (IHXBuffer*) new CHXBuffer;
            if( m_pSessionBuf )
            {
            m_pSessionBuf->AddRef();
        }
            else
            {
                return HXR_OUTOFMEMORY;
            }
        }
    }
    else
    {
        /* create this buffer */
        m_pSessionBuf = (IHXBuffer*) new CHXBuffer;
        if( m_pSessionBuf )
        {
        m_pSessionBuf->AddRef();
    }
        else
        {
            return HXR_OUTOFMEMORY;
        }
    }

    if (m_pPlayerBuf)
    {
        m_pPlayerBuf->AddRef();
        if (m_pPlayerBuf->Release() > 1)
        {
            /*
             * Cannot use this buffer the next time
             * release our reference and  create a new one
             */
            m_pPlayerBuf->Release();

            m_pPlayerBuf = (IHXBuffer*) new CHXBuffer;
            if( m_pSessionBuf )
            {
            m_pPlayerBuf->AddRef();
        }
            else
            {
                return HXR_OUTOFMEMORY;
            }
    }
    }
    return HXR_OK;
}

void CHXAudioSession::ConvertTo8BitAndOrMono(HXAudioData* pAudioData)
{
    BOOL bChannelConversion = (m_BeforeHookDeviceFmt.uChannels == 1) &&
                              (m_DeviceFmt.uChannels == 2);
    BOOL bBitConversion     = m_BeforeHookDeviceFmt.uBitsPerSample == 8;

    /* Atleast one of them should be true to be in this function */
    HX_ASSERT(bChannelConversion || bBitConversion);

    ULONG32     ulLen           = pAudioData->pData->GetSize();
    short int*  pShortBuf       = (short int*) pAudioData->pData->GetBuffer();
    UCHAR*      pOutUCharBuf    = pAudioData->pData->GetBuffer();
    short int*  pOutShortBuf    = (short int*) pAudioData->pData->GetBuffer();
    ULONG32     ulLoopCount     = ulLen;

    if (bBitConversion && bChannelConversion)
    {
        ulLen       =  pAudioData->pData->GetSize() / 4;
        ulLoopCount = pAudioData->pData->GetSize() / 4;
    }
    else if (bBitConversion && !bChannelConversion)
    {
        ulLen       = pAudioData->pData->GetSize() / 2;
        ulLoopCount = pAudioData->pData->GetSize() / 2;
    }
    else /*if (!bBitConversion && bChannelConversion) */
    {
        ulLen       = pAudioData->pData->GetSize() / 2;
        ulLoopCount = pAudioData->pData->GetSize() / 4;
    }

    for(ULONG32 j = 0; j < ulLoopCount; j++)
    {
        if (bBitConversion && bChannelConversion)
        {
            *pOutUCharBuf++ = (UCHAR)   (
                                ((LONG32) ((*pShortBuf++  + 32768L) >> 8) +
                                 (LONG32) ((*pShortBuf++  + 32768L) >> 8))/2
                                        );
        }
        else if (bBitConversion && !bChannelConversion)
        {
            *pOutUCharBuf++ = (UCHAR)((*pShortBuf++  + 32768L) >> 8);
        }
        else /*if (!bBitConversion && bChannelConversion) */
        {
            *pOutShortBuf++ = (short int) (((LONG32) *pShortBuf++  + (LONG32) *pShortBuf++)/2);
        }
    }

    pAudioData->pData->SetSize(ulLen);
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::ConvertToEight
 *      Purpose:
 */
void CHXAudioSession::ConvertToEight()
{
    UCHAR* pSessionBuf = m_pSessionBuf->GetBuffer();
    ULONG32 ulLen = m_ulBytesPerGran / sizeof(short);
    short int* iTmp = (short int*) pSessionBuf;

    for(ULONG32 j = 0; j < ulLen; j++ )
    {
        pSessionBuf[j] = (UCHAR) ((*iTmp++  + 32768L) >> 8);
    }
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::TryOpenAudio
 *      Purpose:
 *       Try to open the audio device.
 */
HX_RESULT CHXAudioSession::TryOpenAudio()
{
    HX_RESULT theErr = HXR_OK;
    BOOL bDeviceOpened = FALSE;

    // Free the audio device if it is ours so that we can create it on the core thread!
    if ((!m_bReplacedDev || !m_bUsingReplacedDevice) && m_pCurrentAudioDev)
    {

        ReleaseAudioDevice();
        RestoreReplacedDevice();
        m_pAudioDev = NULL;
    }

    theErr = CreateAudioDevice();

    if (!theErr && m_pCurrentAudioDev)
    {
        m_pAudioDev = m_pCurrentAudioDev;

        if (!m_bReplacedDev || !m_bUsingReplacedDevice)
        {
            ((CHXAudioDevice*)m_pAudioDev)->SetGranularity( m_ulGranularity, m_ulBytesPerGran);
        }
        theErr = m_pAudioDev->Open( &m_ActualDeviceFmt, this );
        bDeviceOpened = TRUE;
        m_ulBlocksWritten = 0;

        /* we always open in a PAUSED state */
        if (!theErr)
        {
            theErr = m_pAudioDev->Pause();
            _NotifyTimelineWatchers(TLW_PAUSE);
        }

        if (theErr != HXR_OK)
        {
            m_pAudioDev = NULL;
        }

        if (!theErr && m_pAudioDev)
        {
            /* Set the initial device volume */
            m_pAudioDev->SetVolume(m_bMute ? 0 : m_uVolume);
        }
    }

    /* Any error from audio device other than memory error is returned
     * as HXR_AUDIO_DRIVER
     */
    if (theErr != HXR_OK && theErr != HXR_OUTOFMEMORY)
    {
        theErr = HXR_AUDIO_DRIVER;
    }

#ifndef _CARBON
    if (!theErr && bDeviceOpened && m_bShouldOpenOnCoreThread &&
        m_pInterruptState && !m_pInterruptState->AtInterruptTime())
    {
        // we should re-open on the core thread!!!
        m_bToBeReOpened = TRUE;
        if( !m_pDeviceCallback )
        {
            m_pDeviceCallback = new HXDeviceSetupCallback(this);
            m_pDeviceCallback->AddRef();
        }
        if (!m_pDeviceCallback->PendingID())
        {
            m_pDeviceCallback->PendingID( m_pScheduler->RelativeEnter(m_pDeviceCallback, 0));
        }

    }
    else
#endif
    {
        m_bToBeReOpened = FALSE;
    }

    return theErr;
}

HX_RESULT
CHXAudioSession::CreateAudioDevice()
{
    HX_RESULT theErr = HXR_OK;

    if (!m_pCurrentAudioDev)
    {
        // create the audioout object
        CHXAudioDevice* pAudioDev = CHXAudioDevice::Create(m_pPreferences);
        if (pAudioDev)
        {
            pAudioDev->AddRef();
            pAudioDev->Init(m_pContext);
            if (pAudioDev->InitVolume(0, 100) == TRUE)
            {
                m_bAudioDeviceSupportsVolume = TRUE;
            }
            else
            {
                m_bAudioDeviceSupportsVolume = FALSE;
            }

            m_pCurrentAudioDev = (IHXAudioDevice*) pAudioDev;
        }
        else
        {
            theErr = HXR_OUTOFMEMORY;
        }
    }

    return theErr;
}

void
CHXAudioSession::ReleaseAudioDevice()
{
    if (m_pCurrentAudioDev)
    {
        ProcessAudioDevice(ACTION_REMOVE, m_pCurrentAudioDev);
    }

    m_pCurrentAudioDev->Close(FALSE);
    _NotifyTimelineWatchers( TLW_CLOSE );
    HX_RELEASE(m_pCurrentAudioDev);

    m_bToBeReOpened = FALSE;
    if (m_pDeviceCallback && m_pDeviceCallback->PendingID())
    {
        m_pScheduler->Remove(m_pDeviceCallback->PendingID());
        m_pDeviceCallback->PendingID(0);
    }
}

void
CHXAudioSession::RestoreReplacedDevice()
{
    if (m_bReplacedDev && !m_bUsingReplacedDevice && !m_pCurrentAudioDev)
    {
        m_pCurrentAudioDev = m_pReplacedAudioDev;
        m_pCurrentAudioDev->AddRef();
        m_bUsingReplacedDevice = TRUE;
    }
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::OpenAudio
 *      Purpose:
 *       Open the audio device.
 */
HX_RESULT CHXAudioSession::OpenAudio()
{
    HX_RESULT theErr = TryOpenAudio();

    if (theErr == HXR_AUDIO_DRIVER)
    {
        StopAllOtherPlayers();
        theErr = TryOpenAudio();
    }

    return theErr;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::CreatePlaybackBuffer
 *      Purpose:
 *              This is the buffer that we mix all player buffers into
 *              and the one we write to the audio device.
 */
HX_RESULT CHXAudioSession::CreatePlaybackBuffer()
{
    // Calculate the number of bytes per granularity.
    m_ulBytesPerGran = (ULONG32)
            (((m_DeviceFmt.uChannels * ((m_DeviceFmt.uBitsPerSample==8)?1:2) *  m_DeviceFmt.ulSamplesPerSec)
                            / 1000.0) * m_ulGranularity);

    /* Number of samples required at output should be a multiple of 8 if
     * sampling rate is 8K/16K/32K...or a multiple of 11 for 11K/22K...
     * This is needed since the resamplerequires works reliably ONLY if
     * this condition is true. Ken is working on this problem. This is
     * an interim fix
     */
    ULONG32 ulExtraGranularity = 1;
    if (m_DeviceFmt.ulSamplesPerSec % 8 == 0)
    {
        ulExtraGranularity = 8;
    }
    else
    {
        ulExtraGranularity = 11;
    }


    if (m_ulBytesPerGran % (2*m_DeviceFmt.uChannels*ulExtraGranularity) != 0)
    {
        m_ulBytesPerGran -= m_ulBytesPerGran % (2*m_DeviceFmt.uChannels*ulExtraGranularity);

        m_dGranularity = (double) m_ulBytesPerGran / (double) ((double) (m_DeviceFmt.uChannels * ((m_DeviceFmt.uBitsPerSample==8)?1:2) *  m_DeviceFmt.ulSamplesPerSec)
                                / 1000.0);
    }

    // Readjust the max size of the block
    m_ActualDeviceFmt.uMaxBlockSize = (UINT16) m_ulBytesPerGran;

    HX_RELEASE(m_pSessionBuf);
    HX_RELEASE(m_pPlayerBuf);

    m_pSessionBuf = new CHXBuffer;
    m_pSessionBuf->AddRef();
    m_pSessionBuf->SetSize(m_ulBytesPerGran);

    m_DeviceFmt.uMaxBlockSize   = (UINT16) m_ulBytesPerGran;
    m_ActualDeviceFmt.uMaxBlockSize = m_DeviceFmt.uMaxBlockSize;

    return HXR_OK;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::Pause
 *      Purpose:
 *       Pause playback of this Player's audio.
 */
HX_RESULT CHXAudioSession::Pause( CHXAudioPlayer* p)
{
    m_pMutex->Lock();

    BOOL bUseStopInPause = FALSE;

#if defined _DEBUG && defined HELIX_FEATURE_AUDIO_MULTIPLAYER_PAUSE
    bUseStopInPause = HXDebugOptionEnabled("zUseStopInPause");
#endif

    if (!bUseStopInPause && NumberOfResumedPlayers() == 0)
    {
        m_bPaused = TRUE;

        if(m_ulCallbackID)
        {
            m_pScheduler->Remove(m_ulCallbackID);
            m_ulCallbackID = 0;
        }

        // Check to see if all audio players are paused, then and only
        // then will we pause the device
        if ( m_pAudioDev )
        {
            m_pAudioDev->Pause();
            _NotifyTimelineWatchers(TLW_PAUSE);
        }

        m_bAtLeastOneTimeReceived = FALSE;
        m_pLastPausedPlayer = p;
    }
    /*
     * more than one audio player is currently active.
     * We need to do the following:
     * 1. get the current time from the device
     * 2. get the time for data we have already pushed down to the device
     * 3. flush the audio device
     * 4. instruct all streams to "rewind" by the "written but not played" duration
     */
#ifdef HELIX_FEATURE_AUDIO_MULTIPLAYER_PAUSE
    else if (!GetDisableMultiPlayPauseSupport() && m_pAudioDev && p->HasDataInAudioDevice())
    {
        HX_ASSERT(!m_bPaused && !m_bStoppedDuringPause);
        RewindSession();

        // this if is temporary
        if (NumberOfResumedPlayers() > 0)
        {
            ActualResume();
        }
    }
#endif

    m_pMutex->Unlock();
    return HXR_OK;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::Resume
 *      Purpose:
 *       Resume playback of this Player's audio.
 */
HX_RESULT CHXAudioSession::Resume(CHXAudioPlayer* pPlayerToExclude)
{
    HX_RESULT theErr = HXR_OK;

    if ((m_bPaused || m_bStoppedDuringPause) &&
        (!m_pLastPausedPlayer || (m_pLastPausedPlayer == pPlayerToExclude)))
    {
        theErr = ActualResume();
    }
#ifdef HELIX_FEATURE_AUDIO_MULTIPLAYER_PAUSE
    /*
     * we need to re-mix to start the newly resumed player instantly
     * and not delay it by pushdown
     */
    else if (!GetDisableMultiPlayPauseSupport() &&
             (NumberOfResumedPlayers() > 1 ||
            (m_pLastPausedPlayer && m_pLastPausedPlayer != pPlayerToExclude)))
    {
        RewindSession(pPlayerToExclude);
        theErr = ActualResume();
    }
#endif

    return theErr;
}

HX_RESULT
CHXAudioSession::ActualResume()
{
    HX_RESULT   theErr  = HXR_OK;

    if (m_bInPlayAudio)
    {
        // can only happen in multi-player pause/resume/stop case
        m_bDeferActualResume = TRUE;
        return HXR_OK;
    }

    m_bPaused = FALSE;
    m_bStoppedDuringPause = FALSE;

    if (m_bToBeReOpened)
    {
        m_bDeferActualResume = TRUE;
        goto exit;
    }

    if (m_bInActualResume)
    {
        return HXR_OK;
    }

    m_bInActualResume = TRUE;

    theErr = PlayAudio();

    m_bInActualResume = FALSE;

    /*
     * we may "re-pause" the player in PlayAudio if we need to buffer more
     * data to play, if we are paused now, don't resume the audio device now
     * or we will play data that we don't account for.  Fixes the G2 B2
     * Live pause video sync bug.  JEFFA & RAHUL 11/4/98
     */
    if (theErr || m_bPaused || m_bStoppedDuringPause)
    {
        goto exit;
    }

    // Get the initial system time.
    if (m_pAudioDev)
    {
        m_pAudioDev->Resume();
        _NotifyTimelineWatchers(TLW_RESUME);
    }

    m_pLastPausedPlayer      = NULL;
    m_ulLastFakeCallbackTime = HX_GET_TICKCOUNT();

exit:
    return theErr;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::Seek
 *      Purpose:
 *       Seek playback of this Player's audio.   TBD
 */
HX_RESULT CHXAudioSession::Seek(CHXAudioPlayer* pPlayerToExclude, const UINT32  ulSeekTime)
{
    m_pMutex->Lock();
    if (NumberOfActivePlayers() <= 1)
    {
        m_ulStartTime   = m_ulCurrentTime = 0;
        m_dBufEndTime   = 0.;

        if (m_pAudioDev)
        {
            m_pAudioDev->Reset();
        }

        m_ulBlocksWritten       = 0;
        m_dNumBytesWritten      = (double) 0;
        m_dNumBytesPlayed       = (double) 0;

        while (m_pAuxiliaryAudioBuffers &&
               m_pAuxiliaryAudioBuffers->GetCount() > 0)
        {
            HXAudioData* pAudioData =
                (HXAudioData*) m_pAuxiliaryAudioBuffers->RemoveHead();
            pAudioData->pData->Release();
            delete pAudioData;
        }

        m_bFirstPlayAudio           = TRUE;

        m_bTimeSyncReceived         = FALSE;
        m_bAtLeastOneTimeReceived   = FALSE;
        m_ulLastAudioTime           = 0;
    }
    /*
     * more than one audio player is currently active.
     * We need to do the following:
     * 1. get the current time from the device
     * 2. get the time for data we have already pushed down to the device
     * 3. flush the audio device
     * 4. instruct all streams to "rewind" by the "written but not played" duration
     */
#ifdef HELIX_FEATURE_AUDIO_MULTIPLAYER_PAUSE
    else if (!GetDisableMultiPlayPauseSupport() && m_pAudioDev)
    {
        /* nothing needs to be done here..
         * it has already been taken care of udring Pause()!!
         *
         * this comment is here for the sake of completeness
         */
    }
#endif

    m_pMutex->Unlock();

    return HXR_OK;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::Stop
 *      Purpose:
 *       Stop playback of this Player's audio.
 */
HX_RESULT CHXAudioSession::Stop( CHXAudioPlayer* p, BOOL bFlush )
{
    m_pMutex->Lock();
    if (NumberOfActivePlayers() == 0)
    {
        if(m_ulCallbackID)
        {
            m_pScheduler->Remove(m_ulCallbackID);
            m_ulCallbackID = 0;
        }

        // Close the audio device only if all players are not playing.
        if ( !IsPlaying() && m_pAudioDev )
        {
            m_pAudioDev->Close(bFlush);
            _NotifyTimelineWatchers( TLW_CLOSE );
            m_ulBlocksWritten = 0;
            m_pAudioDev = NULL;
        }

        // Reset the session ...
        ResetSession();
    }
    /*
     * more than one audio player is currently active.
     * We need to do the following:
     * 1. get the current time from the device
     * 2. get the time for data we have already pushed down to the device
     * 3. flush the audio device
     * 4. instruct all streams to "rewind" by the "written but not played" duration
     */
#ifdef HELIX_FEATURE_AUDIO_MULTIPLAYER_PAUSE
    else if (!GetDisableMultiPlayPauseSupport() && m_pAudioDev && p->HasDataInAudioDevice())
    {
        RewindSession(p);
        if (NumberOfResumedPlayers() > 0)
        {
            HX_ASSERT(m_bPaused == FALSE);
            ActualResume();
        }
    }
#endif

    m_pMutex->Unlock();
    return HXR_OK;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::ResetSession
 *      Purpose:
 */
void CHXAudioSession::ResetSession(void)
{

    // We only want to reset session if we are no longer playing anything.
    if ( IsPlaying() )
        return;

    m_bInited       = FALSE;
    m_bDisableWrite = FALSE;

    // Free the audio device if it is ours
    if ((!m_bReplacedDev || !m_bUsingReplacedDevice) && m_pCurrentAudioDev)
    {
        ReleaseAudioDevice();
    }

    RestoreReplacedDevice();

    m_pAudioDev = 0;

    // Delete the player mixer buffer
    HX_RELEASE(m_pPlayerBuf);

    // Delete the session mixer buffer
    HX_RELEASE(m_pSessionBuf);

    m_ulIncreasingTimer = 0;
    m_ulStartTime       = 0;
    m_ulCurrentTime     = 0;
    m_ulBytesPerGran    = 0;
    m_bHasStreams       = FALSE;
    m_bPaused            = TRUE;
    m_bStoppedDuringPause = FALSE;
    m_bTimeSyncReceived  = FALSE;
    m_bAtLeastOneTimeReceived = FALSE;
    m_ulLastAudioTime         = 0;
    m_bShouldOpenOnCoreThread = FALSE;

    if(m_ulCallbackID && m_pScheduler)
    {
        m_pScheduler->Remove(m_ulCallbackID);
        m_ulCallbackID = 0;
    }

    if (m_pDeviceCallback && m_pDeviceCallback->PendingID())
    {
        m_pScheduler->Remove(m_pDeviceCallback->PendingID());
        m_pDeviceCallback->PendingID(0);
    }

    m_bFirstPlayAudio       = TRUE;
    m_dBufEndTime = 0.;

    if (m_pAuxiliaryAudioBuffers)
    {
        while (m_pAuxiliaryAudioBuffers->GetCount() > 0)
        {
            HXAudioData* pAudioData =
                (HXAudioData*) m_pAuxiliaryAudioBuffers->RemoveHead();
            pAudioData->pData->Release();
            delete pAudioData;
        }

        HX_DELETE(m_pAuxiliaryAudioBuffers);
    }

    /* Default value of Device format */
    m_DeviceFmt.uChannels       = 2;
    m_DeviceFmt.uBitsPerSample  = 16;
    m_DeviceFmt.ulSamplesPerSec = 16000;
    m_DeviceFmt.uMaxBlockSize   = 64000;

    m_ulBlocksWritten           = 0;
    m_dNumBytesWritten          = (double) 0;
    m_dNumBytesPlayed           = (double) 0;
    m_bDeferActualResume        = FALSE;
    m_pLastPausedPlayer         = NULL;


    HX_RELEASE(m_pMPPSupport);

    return;
}

HX_RESULT
CHXAudioSession::ProcessAudioHook(PROCESS_ACTION action,
                                  IHXAudioHook* pAudioHook)
{
    return HXR_OK;
}

HX_RESULT
CHXAudioSession::ProcessAudioDevice(PROCESS_ACTION    action,
                                    IHXAudioDevice*  pAudioDevice)
{
    return HXR_OK;
}

/************************************************************************
 *  Method:
 *      CHXAudioSession::Replace
 *  Purpose:
 *      Used to replace the default audio device.
 *      This method will fail if the audio device is in use or it has
 *      already been replaced.
 */
STDMETHODIMP
CHXAudioSession::Replace(IHXAudioDevice* /*IN*/ pAudioDevice)
{
    if (!pAudioDevice)
    {
        return HXR_POINTER;
    }

    // Have we already replaced the audio device?
    if (m_bReplacedDev)
    {
        return HXR_UNEXPECTED;
    }

    // Is the audio device in use?
    if (m_pAudioDev)
    {
        return HXR_FAIL;
    }

    // make sure the new audio device is initialized.
    m_bReplacedDev = TRUE;
    m_bUsingReplacedDevice = TRUE;

    if (m_pCurrentAudioDev)
    {
        // XXXNH: if we've already created an audio device, then shut it down
        m_pCurrentAudioDev->Close(TRUE);
        _NotifyTimelineWatchers( TLW_CLOSE );
        HX_RELEASE(m_pCurrentAudioDev);
    }

    m_pCurrentAudioDev = pAudioDevice;
    m_pCurrentAudioDev->AddRef();

    m_pReplacedAudioDev = pAudioDevice;
    m_pReplacedAudioDev->AddRef();

    m_bAudioDeviceSupportsVolume = FALSE;
    if (m_pCurrentAudioDev->InitVolume(HX_MIN_VOLUME, HX_MAX_VOLUME) == TRUE)
    {
        m_bAudioDeviceSupportsVolume = TRUE;
        /* Is our current volume setting different ?*/
        UINT16 uNewVolume = m_pCurrentAudioDev->GetVolume();
        if (uNewVolume != m_uVolume)
        {
            m_uVolume = uNewVolume;
#ifdef HELIX_FEATURE_VOLUME
            if( m_pDeviceVolume )
            {
                m_pDeviceVolume->SetVolume(m_uVolume);
            }
#endif
        }
    }

    return HXR_OK;
}


/************************************************************************
 *  Method:
 *      CHXAudioSession::Remove
 *  Purpose:
 *      Used to restore the default audio device.  A pointer to the
 *      original replacement audio device must be passed in for
 *      authentication purposes- we can't have just anyone reseting
 *      the audio device.
 *      This method will fail if the interface passed in is not the
 *      current audio device or if the current audio device is in use.
 */
STDMETHODIMP
CHXAudioSession::Remove(IHXAudioDevice* /*IN*/ pAudioDevice)
{
    if (!pAudioDevice)
    {
        return HXR_POINTER;
    }

    // If we're using the audio service fail.
    if (m_pAudioDev)
    {
        return HXR_FAIL;
    }

    // Have we not replaced the audio device?
    if (!m_bReplacedDev)
    {
        return HXR_UNEXPECTED;
    }

    // make sure the it's the same audio device
    if (m_pReplacedAudioDev != pAudioDevice)
    {
        return HXR_INVALID_PARAMETER;
    }

    if (m_pCurrentAudioDev)
    {
        ProcessAudioDevice(ACTION_REMOVE, m_pCurrentAudioDev);
    }

    if (m_pCurrentAudioDev == m_pReplacedAudioDev)
    {
        // Close the audio device
        HX_RELEASE(m_pCurrentAudioDev);
    }

    HX_RELEASE(m_pReplacedAudioDev);
    m_bReplacedDev = FALSE;

    return HXR_OK;
}


/************************************************************************
*  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.
*/
STDMETHODIMP
CHXAudioSession::SetFinalHook(IHXAudioHook* /*IN*/ pHook)
{
    if (m_pFinalHook || !pHook)
    {
        return HXR_UNEXPECTED;
    }

    m_pFinalHook = pHook;
    m_pFinalHook->AddRef();

    BOOL bIsInterruptSafe = FALSE;
    IHXInterruptSafe* pInterruptSafe = NULL;

    if (m_pFinalHook->QueryInterface(IID_IHXInterruptSafe,
                                    (void**) &pInterruptSafe) == HXR_OK)
    {
        bIsInterruptSafe = pInterruptSafe->IsInterruptSafe();
        pInterruptSafe->Release();
    }

    if (!bIsInterruptSafe)
    {
        IHXInterruptState* pState = NULL;
        HX_VERIFY(m_pContext->QueryInterface(IID_IHXInterruptState,
                            (void**) &pState) == HXR_OK);

        pState->EnableInterrupt(FALSE);
        pState->Release();
    }

    ProcessAudioHook(ACTION_ADD, m_pFinalHook);

    return HXR_OK;
}

/************************************************************************
*  Method:
*   IHXAudioDeviceManager::RemoveFinalHook
*  Purpose:
*       Remove final hook
*/
STDMETHODIMP
CHXAudioSession::RemoveFinalHook(IHXAudioHook* /*IN*/ pHook)
{
    if (!m_pFinalHook || m_pFinalHook != pHook)
    {
        return HXR_UNEXPECTED;
    }

    ProcessAudioHook(ACTION_REMOVE, m_pFinalHook);

    HX_RELEASE(m_pFinalHook);

    return HXR_OK;
}

/************************************************************************
*  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.
*/
STDMETHODIMP
CHXAudioSession::GetAudioFormat(HXAudioFormat*  /*IN/OUT*/pAudioFormat)
{
    if (!pAudioFormat)
    {
        return HXR_UNEXPECTED;
    }

    memcpy( pAudioFormat, &m_ActualDeviceFmt, sizeof( HXAudioFormat ));
    return HXR_OK;
}

/**********************************************************************
 *  Method:
 *      IHXAudioDeviceManager2::IsReplacedDevice
 *  Purpose:
 *  This is used to determine if the audio device has been replaced.
 */
STDMETHODIMP_(BOOL) CHXAudioSession::IsReplacedDevice()
{
    if (m_bUsingReplacedDevice && m_pReplacedAudioDev)
    {
        return TRUE;
    }

    return FALSE;
}

/*
 *  IHXAudioResamplerManager methods
 *
 */
STDMETHODIMP
CHXAudioSession::CreateResampler(HXAudioFormat              inAudioFormat,
                                 REF(HXAudioFormat)         outAudioFormat,
                                 REF(IHXAudioResampler*)   pResampler)
{
    HX_RESULT                   rc = HXR_FAILED;
#if defined(HELIX_FEATURE_RESAMPLER) && !defined(HELIX_CONFIG_FIXEDPOINT)
    HXCDQualityResampler*       pNewResampler = NULL;

    pResampler = NULL;

    pNewResampler = new HXCDQualityResampler();
    if (pNewResampler &&
        HXR_OK == pNewResampler->Init(inAudioFormat, outAudioFormat))
    {
        rc = pNewResampler->QueryInterface(IID_IHXAudioResampler, (void**)&pResampler);
    }
    else
    {
        HX_DELETE(pNewResampler);
        rc = HXR_FAILED;
    }
#endif /* HELIX_FEATURE_RESAMPLER && !HELIX_CONFIG_FIXEDPOINT*/

    return rc;
}

/*
 *  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.
*/
STDMETHODIMP CHXAudioSession::SetAudioPushdown(
                                        UINT32 /*IN*/ ulMinimumPushdown)
{
    m_ulMinimumPushdown = ulMinimumPushdown;

    UpdateMinimumPushdown();
    return HXR_OK;
}

/************************************************************************
*  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.
*/
STDMETHODIMP
CHXAudioSession::GetAudioPushdown(REF(UINT32) /*OUT*/ ulAudioPushdown)
{
    ulAudioPushdown = m_ulMinimumPushdown;
    return HXR_OK;
}

/************************************************************************
*  Method:
*      IHXAudioPushdown2::GetCurrentAudioDevicePushdown
*  Purpose:
*           Use this to get the audio pushed down to the audio device and haven't
*           been played yet
*/
STDMETHODIMP
CHXAudioSession::GetCurrentAudioDevicePushdown(REF(UINT32) /*OUT*/ ulAudioPusheddown)
{
    HX_RESULT   rc = HXR_OK;
    UINT16      uNumBlocks = 0;
    UINT32      ulNumBlocksPlayed = 0;
    UINT32      ulCurTime = 0;

    ulAudioPusheddown = 0;

    if (m_bToBeReOpened || !m_pAudioDev)
    {
        goto cleanup;
    }

    if ( (!m_bReplacedDev) && (((CHXAudioDevice*)m_pAudioDev)->IsWaveOutDevice()) )
    {
        uNumBlocks = ((CHXAudioDevice*)m_pAudioDev)->NumberOfBlocksRemainingToPlay();
    }
    else
    {
        if (m_pAudioDev->GetCurrentAudioTime(ulCurTime) == HXR_OK)
        {
            ulNumBlocksPlayed = (UINT32) ((double) ulCurTime / m_dGranularity);
            if (m_ulBlocksWritten > ulNumBlocksPlayed)
            {
                uNumBlocks = (UINT16) (m_ulBlocksWritten - ulNumBlocksPlayed);
            }
        }
    }

    ulAudioPusheddown = (UINT32)(uNumBlocks * m_dGranularity);

cleanup:

    return rc;
}

/************************************************************************
 *  Method:
 *      CHXAudioSession::OnTimeSync
 *  Purpose:
 *      Notification interface provided by users of the IHXAudioDevice
 *      interface. This method is called by the IHXAudioDevice when
 *      audio playback occurs.
 */
STDMETHODIMP CHXAudioSession::OnTimeSync(ULONG32 /*IN*/ ulCurrentTime)
{
    HX_RESULT theErr = HXR_OK;
    if (m_pCoreMutex)
    {
        m_pCoreMutex->Lock();
    }

     m_bTimeSyncReceived = TRUE;
#ifdef _MACINTOSH
     if (zm_Locked)
     {
        m_pCoreMutex->Unlock();
        return HXR_OK;
     }

     zm_Locked=TRUE;
#endif

    CHXAudioPlayer* pPlayer;
    CHXSimpleList::Iterator lIter;

    /*
     * We may reach here from a WOM_DONE callback from audio thread AFTER
     * stopping the audio device and resetting our member variables.
     * This is because we may be waiting on m_pCoreMutex owned by the main
     * thread (where we stop the audio device).
     * Do not update any member variables in this case since this may screw
     * up subsequent playback.
     */

    /* On Mac, we may have been paused but have not yet issued
     * pause on the audio device (due to interrupt time conflicts).
     * Ignore any more timesyncs and do not pump any more data
     * to the audio device.
     */
    if (!m_bInited || m_bPaused || m_bStoppedDuringPause)
    {
        goto exit;
    }

    /* This is only set in rewindsession - used in pause/resume for multiple
     * players. We may be waiting on te core mutex on a timesync callback
     * from the audio device when we reset/resume the audio device since
     * someone hit pause/resume. In this case, the time passed into
     * OnTimeSync is still from previous generation and we need to resync.
     */
    if (m_uAskFromAudioDevice > 0 && m_pAudioDev)
    {
        m_uAskFromAudioDevice--;
        m_pAudioDev->GetCurrentAudioTime(ulCurrentTime);
    }


#if defined(_WINDOWS) || defined(_WIN32) || defined(_MACINTOSH)
    ulCurrentTime = AnchorDeviceTime(ulCurrentTime);
#endif /*defined(_WINDOWS) || defined(_WIN32)*/

    /* Adjust current time to new larger time. */
    if (ulCurrentTime+m_ulStartTime > m_ulCurrentTime)
    {
        /* Check for a messed up time here...
         * Sometimes, Audio cards may give out some insane value for
         * the number of bytes played...
         */
        if (CALCULATE_ELAPSED_TICKS(
                    m_ulCurrentTime, ulCurrentTime+m_ulStartTime) >
                SOME_INSANELY_LARGE_VALUE)
        {
            /* THIS SOUND CARD IS GOING CRAZY...
             * ATLEAST FOR A WHILE....
             * Ignore this timesync...
             */
//          HX_ASSERT(FALSE);
        }
        else
        {
            m_ulCurrentTime = ulCurrentTime+m_ulStartTime;
        }
    }

    m_dNumBytesPlayed = ConvertMsToBytes(m_ulCurrentTime - m_ulStartTime);

    /* Notify each audio player in the session about the current
     * time.
     */
    lIter = m_pPlayerList->Begin();
    pPlayer = NULL;
    for (; lIter != m_pPlayerList->End(); ++lIter)
    {
        pPlayer = (CHXAudioPlayer*) (*lIter);
        /* Only if the player is in *PLAY* state, send a timesync*/
        if (pPlayer->GetState() == E_PLAYING && pPlayer->GetStreamCount() > 0)
        {
            theErr = pPlayer->OnTimeSync(m_ulCurrentTime);
        }
    }

    //Let all the timeline watchers know..
    _NotifyTimelineWatchers( TLW_TIMESYNC, m_ulCurrentTime);
    
    /* Start playback of next buffer.    */
    if (theErr == HXR_OK && m_bHasStreams)
    {
        theErr = CheckToPlayMoreAudio();
    }

exit:

#ifdef _MACINTOSH
    zm_Locked=FALSE;
#endif

    if (m_pCoreMutex)
    {
        m_pCoreMutex->Unlock();
    }

    lIter = m_pPlayerList->Begin();
    if( theErr )
    {
        for (; lIter != m_pPlayerList->End(); ++lIter)
        {
            pPlayer = (CHXAudioPlayer*) (*lIter);
            if( pPlayer )
            {
                pPlayer->SetError(theErr);
            }
        }
    }
    return theErr;
}

void
CHXAudioSession::UpdateMinimumPushdown()
{
    if (m_ulGranularity)
    {
        m_ulMinBlocksTobeQueued = (UINT32) (m_ulMinimumPushdown*1.0/m_ulGranularity);
        if ((m_ulMinBlocksTobeQueued == 0) ||
            (m_ulMinBlocksTobeQueued*m_ulGranularity < m_ulMinimumPushdown))
        {
            m_ulMinBlocksTobeQueued++;
        }

        if ((m_ulMinBlocksTobeQueued * m_ulGranularity) >= m_ulIdealMinimumPushdown)
        {
            m_ulMinBlocksTobeQueuedAtStart = (UINT32) (m_ulIdealMinimumPushdown*1.0/m_ulGranularity);
        }
        else
        {
            m_ulMinBlocksTobeQueuedAtStart = m_ulMinBlocksTobeQueued;
        }

#if defined(HELIX_FEATURE_PREFERENCES)
        IHXBuffer* pBuffer = NULL;
        if (m_pPreferences &&
            m_pPreferences->ReadPref("RestoreMinimumPushdown", pBuffer) == HXR_OK &&
            pBuffer &&
            ::atoi((char*) pBuffer->GetBuffer()) == 1)
        {
            m_ulMinBlocksTobeQueuedAtStart = m_ulMinBlocksTobeQueued;
        }

        HX_RELEASE(pBuffer);
#endif /* HELIX_FEATURE_PREFERENCES */
    }
}

/*
 *  IHXAudioHookManager methods
 */
/************************************************************************
*  Method:
*      IHXAudioHookManager::AddHook
*  Purpose:
*           Use this to add a hook
*/
STDMETHODIMP CHXAudioSession::AddHook(IHXAudioHook* /*IN*/ pHook)
{
#if defined(HELIX_FEATURE_AUDIO_POSTMIXHOOK)
    if (!pHook)
    {
        return HXR_INVALID_PARAMETER;
    }

    if (!m_pHookList)
    {
        m_pHookList = new CHXSimpleList;
    }

    HXAudioHookInfo* pHookInfo = new HXAudioHookInfo;
    pHookInfo->pHook = pHook;
    pHookInfo->pHook->AddRef();

    pHookInfo->bDisableWrite = FALSE;
    pHookInfo->bFinal   = FALSE;
    pHookInfo->bIgnoreAudioData = FALSE;
    pHookInfo->bMultiChannelSupport = FALSE;

    IHXValues* pValues = NULL;
    if (pHook && pHook->QueryInterface(IID_IHXValues, (void**) &pValues) == HXR_OK)
    {
        UINT32 ulValue = 0;
        pValues->GetPropertyULONG32("IgnoreAudioData", ulValue);
        pHookInfo->bIgnoreAudioData = (ulValue == 1);
        HX_RELEASE(pValues);
    }

    IHXAudioMultiChannel* pMultiChannel = NULL;
    if (pHook && HXR_OK == pHook->QueryInterface(IID_IHXAudioMultiChannel, (void**) &pMultiChannel))
    {
        pHookInfo->bMultiChannelSupport = pMultiChannel->GetMultiChannelSupport();
    }
    HX_RELEASE(pMultiChannel);

    m_pHookList->AddTail(pHookInfo);

    ProcessAudioHook(ACTION_ADD, pHook);

    // if have already been initialzied...
    if (m_bInited && m_pAudioDev)
    {
        if (pHookInfo->bIgnoreAudioData ||
            HXR_OK == ProcessAudioHook(ACTION_CHECK, pHook))
        {
            HXAudioFormat audioFormat;
            memcpy( &audioFormat, &m_ActualDeviceFmt, sizeof(HXAudioFormat) );
            pHook->OnInit(&audioFormat);
        }
    }
#endif /* HELIX_FEATURE_AUDIO_POSTMIXHOOK */

    return HXR_OK;
}

/************************************************************************
*  Method:
*      IHXAudioHookManager::RemoveHook
*  Purpose:
*           Use this to remove a hook
*/
STDMETHODIMP CHXAudioSession::RemoveHook(IHXAudioHook* /*IN*/ pHook)
{
#if defined(HELIX_FEATURE_AUDIO_POSTMIXHOOK)
    if (!pHook || !m_pHookList)
    {
        return HXR_UNEXPECTED;
    }

    BOOL bFound = FALSE;
    HXAudioHookInfo* h = 0;
    LISTPOSITION lp, lastlp;
    lp = lastlp = 0;
    lp = m_pHookList->GetHeadPosition();
    while( lp )
    {
        lastlp = lp;
        h = (HXAudioHookInfo*) m_pHookList->GetNext(lp);
        if ( pHook == h->pHook )
        {
            ProcessAudioHook(ACTION_REMOVE, pHook);

            h->pHook->Release();
            delete h;
            h = 0;
            m_pHookList->RemoveAt(lastlp);
            bFound = TRUE;
            break;
        }
    }

    if (!bFound)
    {
        return HXR_FAILED;
    }
#endif /* HELIX_FEATURE_AUDIO_POSTMIXHOOK */

    return HXR_OK;
}

/************************************************************************
 *  Method:
 *      CHXAudioSession::OnTimerCallback
 *  Purpose:
 *      Timer callback when implementing fake timeline.
 */
void    CHXAudioSession::OnTimerCallback()
{
    // NOTE: we are ignoring an HX_RESULT return value here.
    OnTimeSync(m_ulIncreasingTimer);
    /* A call to timesync may result in stopping
     * playback and we do not want to have any more
     * time syncs.
     */
    if (!m_bInited)
    {
        return;
    }

    /* Put this back in the scheduler.
     */
    if(0==m_ulCallbackID)
    {
        *m_pFakeAudioCBTime += (int) (m_ulGranularity*1000);
        m_ulCallbackID = m_pScheduler->RelativeEnter( this, m_ulGranularity);
    }

   ULONG32 ulCurrentTime = HX_GET_TICKCOUNT();

    m_ulIncreasingTimer         += (ulCurrentTime - m_ulLastFakeCallbackTime);
    m_ulLastFakeCallbackTime     = ulCurrentTime;
}

/************************************************************************
 *  Method:
 *      CHXAudioSession::GetCurrentPlaybackTime
 *  Purpose:
 */
ULONG32 CHXAudioSession::GetCurrentPlayBackTime(void)
{
    m_pMutex->Lock();
    //#ifndef _LINUX

    if (!m_bPaused && !m_bStoppedDuringPause)
    {
        ULONG32 ulCurTime = 0;

        /* Get audio device time. */
        if ( m_pAudioDev )
        {
//#if !defined(_WINDOWS) && !defined(_WIN32)
#if !defined(_WINDOWS) && !defined(_WIN32) && !defined(_MACINTOSH)
            if (m_bTimeSyncReceived)
            {
                m_pAudioDev->GetCurrentAudioTime(ulCurTime);

                if (m_ulCurrentTime < ulCurTime+m_ulStartTime)
                {
                    /* Check for a messed up time here...
                     * Sometimes, Audio cards may give out some insane value for
                     * the number of bytes played...
                     */
                    if (CALCULATE_ELAPSED_TICKS(
                                m_ulCurrentTime, ulCurTime+m_ulStartTime) >
                            SOME_INSANELY_LARGE_VALUE)
                    {
                        /* THIS SOUND CARD IS GOING CRAZY...
                         * ATLEAST FOR A WHILE....
                         * Ignore this timesync...
                         */

                        //HX_ASSERT(FALSE);
                    }
                    else
                    {
                        m_ulCurrentTime = ulCurTime+m_ulStartTime;
                    }
                }
            }

#else
            AdjustInRealTime();
#endif /*!defined(_WINDOWS) && !defined(_WIN32)*/
        }
        else
        {
            /* Get current system time. */
            ULONG32 ulCurrentSysTime = HX_GET_TICKCOUNT();
            m_ulIncreasingTimer         += CALCULATE_ELAPSED_TICKS(m_ulLastFakeCallbackTime, ulCurrentSysTime);
            m_ulLastFakeCallbackTime    = ulCurrentSysTime;
            m_ulCurrentTime             = m_ulIncreasingTimer+m_ulStartTime;
        }
    }
    //#endif

    m_dNumBytesPlayed = ConvertMsToBytes(m_ulCurrentTime - m_ulStartTime);
    m_pMutex->Unlock();
    return m_ulCurrentTime;
}


UINT32
CHXAudioSession::AnchorDeviceTime(UINT32 ulCurTime)
{
    UINT32  ulAdjustTime            = ulCurTime;
    UINT32  ulCurrentSystemTime     = HX_GET_TICKCOUNT();

    if (CALCULATE_ELAPSED_TICKS(m_ulLastAudioTime, ulCurTime) >
                SOME_INSANELY_LARGE_VALUE)
    {
        goto exit;
    }

    if (m_bAtLeastOneTimeReceived)
    {
        if (m_ulLastAudioTime == ulCurTime)
        {
            UINT32 ulElapsedTime = CALCULATE_ELAPSED_TICKS(m_ulLastSystemTime, ulCurrentSystemTime);
            ulAdjustTime        += ulElapsedTime;
        }

        if (ulAdjustTime < m_ulLastAudioReturnTime)
        {
            ulAdjustTime = m_ulLastAudioReturnTime;
        }
    }

    m_ulLastAudioTime           = ulCurTime;
    m_ulLastSystemTime          = ulCurrentSystemTime;
    m_ulLastAudioReturnTime     = ulAdjustTime;
    m_bAtLeastOneTimeReceived   = TRUE;

//{FILE* f1 = ::fopen("c:\\audio.txt", "a+"); ::fprintf(f1, "%lu\t%lu\t%lu\n", m_ulLastSystemTime, ulCurTime, ulAdjustTime);::fclose(f1);}

exit:
    return ulAdjustTime;
}

void
CHXAudioSession::AdjustInRealTime()
{
    if (m_bAtLeastOneTimeReceived)
    {
        UINT32  ulCurrentSystemTime = HX_GET_TICKCOUNT();
        UINT32 ulElapsedTime = CALCULATE_ELAPSED_TICKS(m_ulLastSystemTime, ulCurrentSystemTime);
        ulElapsedTime   = m_ulLastAudioTime + ulElapsedTime + m_ulStartTime;
        if (m_ulCurrentTime < ulElapsedTime)
        {
            m_ulCurrentTime     = ulElapsedTime;
        }
    }
}

/************************************************************************
 *  Method:
 *      CHXAudioSession::IsPlaying()
 *  Purpose:
 *      Returns TRUE if any audio player is playing.
 */
BOOL CHXAudioSession::IsPlaying()
{
    if (m_pPlayerList)
    {
        CHXAudioPlayer* pPlayer = 0;
        CHXSimpleList::Iterator lIter = m_pPlayerList->Begin();
        for (; lIter != m_pPlayerList->End(); ++lIter)
        {
            pPlayer = (CHXAudioPlayer*) (*lIter);
            if (pPlayer->GetState() == E_PLAYING && pPlayer->GetStreamCount() > 0)
                return TRUE;
        }
    }
    return FALSE;
}

/************************************************************************
 *  Method:
 *      CHXAudioSession::NumberOfActivePlayers()
 *  Purpose:
 *      Returns number of active players (which are not is a STOP state).
 */
UINT16 CHXAudioSession::NumberOfActivePlayers()
{
    UINT16 uNumActive = 0;
    if (m_pPlayerList && m_pPlayerList->GetCount() > 0)
    {
        CHXAudioPlayer* pPlayer = 0;
        CHXSimpleList::Iterator lIter = m_pPlayerList->Begin();
        for (; lIter != m_pPlayerList->End(); ++lIter)
        {
            pPlayer = (CHXAudioPlayer*) (*lIter);
            if (pPlayer->GetState() != E_STOPPED && pPlayer->GetStreamCount() > 0)
            {
                uNumActive++;
            }
        }
    }

    return uNumActive;
}

/************************************************************************
 *  Method:
 *      CHXAudioSession::NumberOfResumedPlayers()
 *  Purpose:
 *      Returns number of resumed players (which are in a PLAY state).
 */
UINT16 CHXAudioSession::NumberOfResumedPlayers()
{
    UINT16 uNumActive = 0;
    if (m_pPlayerList && m_pPlayerList->GetCount() > 0)
    {
        CHXAudioPlayer* pPlayer = 0;
        CHXSimpleList::Iterator lIter = m_pPlayerList->Begin();
        for (; lIter != m_pPlayerList->End(); ++lIter)
        {
            pPlayer = (CHXAudioPlayer*) (*lIter);
            if (pPlayer->GetState() == E_PLAYING && pPlayer->GetStreamCount() > 0)
            {
                uNumActive++;
            }
        }
    }

    return uNumActive;
}

/************************************************************************
 *  Method:
 *      CHXAudioSession::CheckDisableWrite()
 *  Purpose:
 *      TRUE:  If ALL of the players have PostProcessHook with
 *             DisableWrite flag ON.
 *      FALSE: Otherwise
 */
BOOL CHXAudioSession::CheckDisableWrite()
{
    BOOL bDisableWrite = FALSE;
    if ( m_pPlayerList && m_pPlayerList->GetCount() > 0)
    {
        CHXAudioPlayer* pPlayer = 0;
        CHXSimpleList::Iterator lIter = m_pPlayerList->Begin();
        for (; lIter != m_pPlayerList->End(); ++lIter)
        {
            pPlayer = (CHXAudioPlayer*) (*lIter);
            if (pPlayer->GetStreamCount() == 0)
            {
                continue;
            }
            /* If ANY ONE of them is not disabled, return FALSE */
            if (!pPlayer->IsDisableWrite())
            {
                bDisableWrite = FALSE;
                break;
            }
            else
            {
                bDisableWrite = TRUE;
            }
        }
    }

    m_bDisableWrite = bDisableWrite;

    return bDisableWrite;
}

HX_RESULT
CHXAudioSession::CheckToPlayMoreAudio()
{
    HX_RESULT theErr = HXR_OK;

    if (m_bToBeReOpened)
    {
        return HXR_OK;
    }

    BOOL bPlay = FALSE;
    UINT16 uNumBlocks = 0;
    if (!m_pAudioDev)
    {
        bPlay = TRUE;
    }
    else
    {
        if ( (!m_bReplacedDev) && (((CHXAudioDevice*)m_pAudioDev)->IsWaveOutDevice()) )
        {
            uNumBlocks = ((CHXAudioDevice*)m_pAudioDev)->NumberOfBlocksRemainingToPlay();

            /* Now that m_ulMinimumPushdown can be set by the user, it is possible
             * for MIN_BLOCKS_TOBEQUEUED to be 0.
             */
            if (uNumBlocks == 0 ||
                uNumBlocks < m_ulMinBlocksTobeQueued)
            {
                bPlay = TRUE;
            }
        }
        else
        {
            ULONG32 ulCurTime;
            if (m_pAudioDev->GetCurrentAudioTime(ulCurTime) == HXR_OK)
            {
                UINT32 ulNumBlocksPlayed = (UINT32) ((double) ulCurTime / m_dGranularity);
                if (m_ulBlocksWritten > ulNumBlocksPlayed)
                {
                    uNumBlocks = (UINT16) (m_ulBlocksWritten - ulNumBlocksPlayed);
                }

                /* Now that m_ulMinimumPushdown can be set by the user, it is possible
                 * for MIN_BLOCKS_TOBEQUEUED to be 0.
                 */
                if (uNumBlocks == 0 ||
                    uNumBlocks < m_ulMinBlocksTobeQueued)
                {
                    bPlay = TRUE;
                }
            }
            else
            {
                bPlay = FALSE;
            }
        }
    }

//{FILE* f1 = ::fopen("c:\\temp\\play.txt", "a+"); ::fprintf(f1, "%s::CheckToPlayMoreAudio: TickCount: %lu m_ulCurrentTime: %lu Played: %d\n",
//                                                         bCalledFromAudioThread ? "AudioThread" : "MainThread", HX_GET_TICKCOUNT(), m_ulCurrentTime, (int) bPlay);::fclose(f1);}

    if (bPlay)
    {
        HX_ASSERT(!m_pAudioDev || m_ulMinBlocksTobeQueued > uNumBlocks);
        /* Currently we break transcoding feature of jukwbox because:
         * - overriden audio device plays much faster than realtime
         * - mp3 datatype does not implement drynotification interface.
         * - we therefore play silence instead of halting the timeline
         *   when we run out of data.
         *
         * Patch: revert back to old behavior: i.e. push only one
         * block at a time for replaced audio device
         *
         * correct fix: We should fix mp3 renderer to support drynotification
         *
         * XXXRA
         *
         * Update Removing this hack for replaced devices since MP3 renderer
         * now supports dry notification. -- RA 07/18/01:
         */
        if (m_pAudioDev && m_ulMinBlocksTobeQueued > uNumBlocks)
        {
            uNumBlocks = (UINT16) m_ulMinBlocksTobeQueued - uNumBlocks;
        }
        else
        {
            uNumBlocks = 1;
        }

        theErr = PlayAudio(uNumBlocks);
    }

    /* Put this back in the scheduler only if audio streams are present AND disable write
     * is OFF. If disable write is ON, audio data is written in fake timer callbacks
     */
    if (!m_ulCallbackID && m_bHasStreams && !m_bDisableWrite)
    {
        m_bFakeAudioTimeline = FALSE;
        m_ulCallbackID = m_pScheduler->RelativeEnter(this, m_ulGranularity*9/10);
    }

    return theErr;
}


ULONG32 CHXAudioSession::GetInitialPushdown(BOOL bAtStart /* = FALSE*/)
{
    UINT32 uPush = 0;

    if (m_ulGranularity == 0)
    {
        return 0;
    }

    if (bAtStart)
    {
        uPush = m_ulMinBlocksTobeQueuedAtStart;
    }
    else
    {
        uPush = m_ulMinBlocksTobeQueued;
    }

    return (ULONG32) (uPush * m_ulGranularity);
}

STDMETHODIMP CHXAudioSession::Func(void)
{
    HX_RESULT theErr    = HXR_OK;

    m_ulCallbackID = 0;

    if( m_bFakeAudioTimeline )
    {
        OnTimerCallback();
    }
    else
    {
        theErr = CheckToPlayMoreAudio();
        if( theErr != HXR_OK )
        {
            CHXSimpleList::Iterator lIter = m_pPlayerList->Begin();
            CHXAudioPlayer* pPlayer = NULL;
            for (; lIter != m_pPlayerList->End(); ++lIter)
            {
                pPlayer = (CHXAudioPlayer*) (*lIter);
                if( pPlayer )
                {
                    pPlayer->SetError(theErr);
                }
            }
        }
    }
    return theErr;
}

ULONG32
CHXAudioSession::SetGranularity(ULONG32 ulGranularity)
{
    /* DO NOT change Granularity in the midst of a presentation*/
    if (!m_bInited)
    {
        m_ulGranularity = ulGranularity;
        m_dGranularity = m_ulGranularity;

        UpdateMinimumPushdown();
    }

    return m_ulGranularity;
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::GetFormat
 *      Purpose:
 *              Return the session's audio device format.
 */
void CHXAudioSession::GetFormat
(
        HXAudioFormat*   pAudioFormat
)
{
    memcpy(pAudioFormat, &m_DeviceFmt, sizeof( HXAudioFormat) );
}

/************************************************************************
 *  Method:
 *              CHXAudioSession::ProcessPostMixHooks
 *      Purpose:
 *              Send audio data to this player's post mix data hook.
 *
 */
HX_RESULT CHXAudioSession::ProcessPostMixHooks
(
    CHXAudioPlayer* pAudioPlayer,
    IHXBuffer*&    pInBuffer,
    BOOL*           bDisableWrite,
    UINT32          ulBufTime,
    BOOL&           bChanged
)
{
#if defined(HELIX_FEATURE_AUDIO_POSTMIXHOOK)
    HX_RESULT           theErr      = HXR_OK;
    CHXSimpleList*      pHookList   = 0;
    HXAudioHookInfo*     h           = 0;
    UCHAR*              pInData     = pInBuffer->GetBuffer();

    bChanged        = FALSE;
    *bDisableWrite  = FALSE;

    pHookList = pAudioPlayer->GetPostMixHookList();
    if ( pHookList && pHookList->GetCount() > 0)
    {
        pInBuffer->AddRef();

        m_pInDataPtr->pData             = pInBuffer;
        m_pInDataPtr->ulAudioTime       = ulBufTime;
        m_pOutDataPtr->pData            = NULL;

        m_bPostMixHooksUpdated = FALSE;

        // Each hook associated with this player gets the data.
        CHXSimpleList::Iterator lIter = pHookList->Begin();
        for (; !theErr && lIter != pHookList->End(); ++lIter)
        {
            h = (HXAudioHookInfo*) (*lIter);

            if (HXR_OK == ProcessAudioHook(ACTION_CHECK, h->pHook))
            {
                // XXXHP, disable hooks when it doesn't support multi-channel
                if (m_ActualDeviceFmt.uChannels <= 2 || h->bMultiChannelSupport)
                {
                    if ( h->bDisableWrite )
                    {
                        *bDisableWrite = TRUE;
                    }

                    theErr = h->pHook->OnBuffer( m_pInDataPtr, m_pOutDataPtr );
        /*
         // Testing code to simulate post hook
                    static int copy = 1;

                    if (copy == 1)
                    {
                        m_pOutDataPtr->pData = m_pInDataPtr->pData;
                        m_pOutDataPtr->pData->AddRef();
                        m_pOutDataPtr->ulAudioTime  = m_pInDataPtr->ulAudioTime;
                    }
                    else if (copy ==2)
                    {
                        m_pOutDataPtr->pData = new CHXBuffer;
                        m_pOutDataPtr->pData->AddRef();
                        m_pOutDataPtr->pData->Set(m_pInDataPtr->pData->GetBuffer(), m_pInDataPtr->pData->GetSize());
                        m_pOutDataPtr->ulAudioTime  = m_pInDataPtr->ulAudioTime;
                    }
        */

                    /* Check to see if post hook changed the buffer. If so, then
                     * make this output as input to the next Hook.
                     */
                    if (!theErr && m_pOutDataPtr->pData)
                    {
                        /* HACK HACK HACK!!!!!
                         *
                         * RealJukeBox Beta Release 1 has a bug in equalizer
                         * where it passes a buffer without addrefing it....
                         * i.e. refcount of 0.
                         *
                         * We detect this and do this work for them
                         *
                         * This code will be removed post RealPlayer Beta 2
                         * (that is when RealJukeBox Beta 1 expires)
                         *
                         * - XXXRA
                         */
                        m_pOutDataPtr->pData->AddRef();
                        m_pOutDataPtr->pData->AddRef();

                        if (m_pOutDataPtr->pData->Release() > 1)
                        {
                            m_pOutDataPtr->pData->Release();
                        }

                        m_pInDataPtr->pData->Release();
                        m_pInDataPtr->pData         = m_pOutDataPtr->pData;
                        m_pInDataPtr->ulAudioTime   = m_pOutDataPtr->ulAudioTime;

                        m_pOutDataPtr->pData        = 0;

                        bChanged = TRUE;
                    }
                }
            }
            else if (h->bIgnoreAudioData)
            {
                IHXBuffer* pTempBuf = m_pInDataPtr->pData;
                m_pInDataPtr->pData = NULL;
                theErr = h->pHook->OnBuffer( m_pInDataPtr, m_pOutDataPtr);
                m_pInDataPtr->pData = pTempBuf;
            }

            // the PostMixHook list could be altered in OnBuffer() call
            // during SoundAnimation
            if (m_bPostMixHooksUpdated)
            {
                break;
            }
        }
    }

    // Copy the data back to the input structure.
    if (!theErr && bChanged && m_pInDataPtr->pData)
    {
        ULONG32 ulSize = m_pInDataPtr->pData->GetSize();

        HX_ASSERT(ulSize <= m_ulBytesPerGran);

        HX_RELEASE(pInBuffer);

        /* limit size of the buffer to granularity */
        if (ulSize > m_ulBytesPerGran)
        {
            pInBuffer = new CHXBuffer;
            pInBuffer->AddRef();
            pInBuffer->Set(m_pInDataPtr->pData->GetBuffer(), m_ulBytesPerGran);
        }
        else
        {
            m_pInDataPtr->pData->AddRef();
            pInBuffer = m_pInDataPtr->pData;
        }
    }

    HX_RELEASE(m_pInDataPtr->pData);

    return theErr;
#else
    return HXR_NOTIMPL;
#endif /* HELIX_FEATURE_AUDIO_POSTMIXHOOK */
}

void
CHXAudioSession::InitHooks()
{
    CHXSimpleList::Iterator ndx = m_pHookList->Begin();
    for (; ndx != m_pHookList->End(); ++ndx)
    {
        HXAudioHookInfo* pHookInfo = (HXAudioHookInfo*) (*ndx);

        if (pHookInfo->bIgnoreAudioData ||
            HXR_OK == ProcessAudioHook(ACTION_CHECK, pHookInfo->pHook))
        {
            HXAudioFormat audioFormat;
            memcpy( &audioFormat, &m_ActualDeviceFmt, sizeof( HXAudioFormat ));
            pHookInfo->pHook->OnInit(&audioFormat);
            // we do not allow these hooks to change the format on us
            HX_ASSERT(audioFormat.uChannels             == m_ActualDeviceFmt.uChannels &&
                     audioFormat.uBitsPerSample == m_ActualDeviceFmt.uBitsPerSample &&
                     audioFormat.ulSamplesPerSec        == m_ActualDeviceFmt.ulSamplesPerSec &&
                     audioFormat.uMaxBlockSize  == m_ActualDeviceFmt.uMaxBlockSize);
        }
    }
}

void
CHXAudioSession::ProcessHooks(HXAudioData* pAudioData)
{
#if defined(HELIX_FEATURE_AUDIO_POSTMIXHOOK)
    HX_RESULT theErr = HXR_OK;
    CHXSimpleList::Iterator ndx = m_pHookList->Begin();
    for (; ndx != m_pHookList->End(); ++ndx)
    {
        HXAudioHookInfo* pHookInfo = (HXAudioHookInfo*) (*ndx);

        if (HXR_OK == ProcessAudioHook(ACTION_CHECK, pHookInfo->pHook))
        {
            // XXXHP, disable hooks when it doesn't support multi-channel
            if (m_ActualDeviceFmt.uChannels <= 2 || pHookInfo->bMultiChannelSupport)
            {
                m_pOutDataPtr->pData        = NULL;
                m_pOutDataPtr->ulAudioTime  = pAudioData->ulAudioTime;
                m_pOutDataPtr->uAudioStreamType = pAudioData->uAudioStreamType;

                theErr = pHookInfo->pHook->OnBuffer(pAudioData, m_pOutDataPtr);
                if (!theErr && m_pOutDataPtr->pData)
                {
                    HX_RELEASE(pAudioData->pData);
                    m_pSessionBuf = pAudioData->pData = m_pOutDataPtr->pData;
                }
            }
        }
        else if (pHookInfo->bIgnoreAudioData)
        {
            m_pOutDataPtr->pData        = NULL;
            m_pOutDataPtr->ulAudioTime  = pAudioData->ulAudioTime;
            m_pOutDataPtr->uAudioStreamType = pAudioData->uAudioStreamType;

            IHXBuffer* pTmpBuffer = pAudioData->pData;
            pAudioData->pData = NULL;
            theErr = pHookInfo->pHook->OnBuffer(pAudioData, m_pOutDataPtr);
            pAudioData->pData = pTmpBuffer;
        }
    }
#endif /* HELIX_FEATURE_AUDIO_POSTMIXHOOK */
}

double
CHXAudioSession::ConvertMsToBytes(UINT32 ulCurrentTime)
{
    UINT32 ulBytesPerSecond = m_ActualDeviceFmt.uChannels *
                             (m_ActualDeviceFmt.uBitsPerSample / 8) *
                             m_ActualDeviceFmt.ulSamplesPerSec;

    return (double)((ulCurrentTime * 1.0 / 1000) * ulBytesPerSecond);
}


BOOL
CHXAudioSession::IsAudioOnlyTrue(void)
{
    CHXSimpleList::Iterator lIter = m_pPlayerList->Begin();
    for (; lIter != m_pPlayerList->End(); ++lIter)
    {
        CHXAudioPlayer* pPlayer = (CHXAudioPlayer*) (*lIter);

        /* If anyone of them is TRUE, return TRUE */
        if (pPlayer->IsAudioOnlyTrue())
        {
            return TRUE;
        }
    }

    return FALSE;
}

void
CHXAudioSession::StopAllOtherPlayers()
{
    if (m_pContext)
    {
        IHXShutDownEverything* pShutdown;

        if (m_pContext->QueryInterface(IID_IHXShutDownEverything, (void**)&pShutdown) == HXR_OK)
        {
            HX_ASSERT(pShutdown);

            pShutdown->StopAllOtherPlayers();

            pShutdown->Release();
        }

    }

}

void
CHXAudioSession::CheckIfLastNMilliSecsToBeStored()
{
    if (!m_pPlayerList)
    {
        return;
    }

    BOOL bToBeStored = FALSE;
#ifdef HELIX_FEATURE_AUDIO_MULTIPLAYER_PAUSE
    UINT16 uNumPlayersWithStreams = 0;
#endif
    CHXSimpleList::Iterator ndx = m_pPlayerList->Begin();
    for (; ndx != m_pPlayerList->End(); ++ndx)
    {
        CHXAudioPlayer* pPlayer = (CHXAudioPlayer*) (*ndx);

        if (pPlayer->IsLastNMilliSecsToBeStored())
        {
            bToBeStored = TRUE;
            break;
        }

#ifdef HELIX_FEATURE_AUDIO_MULTIPLAYER_PAUSE
        if (!GetDisableMultiPlayPauseSupport() &&
            pPlayer->GetStreamCount() > 0)
        {
            uNumPlayersWithStreams++;
            if (uNumPlayersWithStreams > 1)
            {
                bToBeStored = TRUE;
                break;
            }
        }
#endif
    }

    ndx = m_pPlayerList->Begin();
    for (; ndx != m_pPlayerList->End(); ++ndx)
    {
        CHXAudioPlayer* pPlayer = (CHXAudioPlayer*) (*ndx);
        // pushdown + additional 500 ms...why? i don't know! ;)
        pPlayer->SaveLastNMilliSeconds(bToBeStored, m_ulMinimumPushdown+500);
    }
}

void
CHXAudioSession::RewindSession(CHXAudioPlayer* pPlayerToExclude)
{
    UINT32 ulCurTime        = m_ulCurrentTime;
    UINT32 ulTimeToRewind   = 0;

    m_ulLastRewindTimestamp = HX_GET_TICKCOUNT();

    // Close the audio device only if all players are not playing.
    if (m_pAudioDev)
    {
        m_pAudioDev->Reset();
    }

    m_uAskFromAudioDevice   = 5;

    /* We should have always be writing AHEAD*/
    HX_ASSERT((ULONG32) m_dBufEndTime >= ulCurTime);

    m_bStoppedDuringPause = TRUE;

    if ((ULONG32) m_dBufEndTime > ulCurTime)
    {
        ulTimeToRewind = (ULONG32) m_dBufEndTime - ulCurTime;
        RewindAllPlayers(ulCurTime, ulTimeToRewind, pPlayerToExclude);
    }

    if(m_ulCallbackID )
    {
        m_pScheduler->Remove(m_ulCallbackID);
        m_ulCallbackID = 0;
    }

    m_bFirstPlayAudio       = TRUE;
    m_bTimeSyncReceived     = FALSE;
    m_bAtLeastOneTimeReceived   = FALSE;
    m_dBufEndTime           = m_ulCurrentTime;
    m_ulStartTime           = m_ulCurrentTime;
    m_dNumBytesPlayed       = (double) 0;
    m_ulBlocksWritten       = 0;
    m_dNumBytesWritten      = 0;
    m_ulLastAudioTime       = 0;
//{FILE* f1 = ::fopen("d:\\temp\\multi.txt", "a+"); ::fprintf(f1, "RewindSession %lu\n", m_ulStartTime);::fclose(f1);}
}

void
CHXAudioSession::RewindAllPlayers(UINT32 ulCurTime, UINT32 ulTimeToRewind, CHXAudioPlayer* pPlayerToExclude)
{
    CHXSimpleList::Iterator ndx = m_pPlayerList->Begin();
    for (; ndx != m_pPlayerList->End(); ++ndx)
    {
        CHXAudioPlayer* pPlayer = (CHXAudioPlayer*) (*ndx);
        if (pPlayer != pPlayerToExclude)
        {
            pPlayer->RewindPlayer(ulTimeToRewind);
        }
    }
}

HX_RESULT
CHXAudioSession::Rewind()
{
    HX_RESULT theErr = HXR_OK;

    m_bToBeRewound = FALSE;

#ifdef HELIX_FEATURE_AUDIO_MULTIPLAYER_PAUSE
    /*
     * we need to re-mix to start the newly resumed player instantly
     * and not delay it by pushdown
     */
    if (!GetDisableMultiPlayPauseSupport())
    {
        RewindSession();
        if (NumberOfResumedPlayers() > 0)
        {
            theErr = ActualResume();
        }
    }
#endif

    return theErr;
}

BOOL
CHXAudioSession::ReallyNeedData()
{
    return (m_bSessionBufferDirty ||
            (m_uNumToBePushed > (m_ulMinBlocksTobeQueued-m_ulMinBlocksTobeQueuedAtStart))) ? TRUE : FALSE;
}

BOOL CHXAudioSession::GetDisableMultiPlayPauseSupport()
{
    if(!m_pMPPSupport)
        return FALSE;

    return m_pMPPSupport->GetDisableMultiPlayPauseSupport();
}

void
CHXAudioSession::ReopenDevice()
{
#ifndef _CARBON
    if (m_bToBeReOpened &&
        m_pInterruptState && !m_pInterruptState->AtInterruptTime())
    {
        m_pDeviceCallback->PendingID(m_pScheduler->RelativeEnter(m_pDeviceCallback, 0));
        return;
    }
#endif

    if (m_bToBeReOpened)
    {
        TryOpenAudio();

        if (!m_bToBeReOpened && m_pAudioDev && m_bDeferActualResume)
        {
            ActualResume();
        }
    }
}



//
// HXDeviceSetupCallback

CHXAudioSession::HXDeviceSetupCallback::HXDeviceSetupCallback(CHXAudioSession* it) :
     m_lRefCount (0)
    ,m_pAudioSessionObject(it)
    ,m_ulCallbackID(0)
{
}

CHXAudioSession::HXDeviceSetupCallback::~HXDeviceSetupCallback()
{
    HX_ASSERT(m_ulCallbackID==0);
    m_pAudioSessionObject = NULL;
}

STDMETHODIMP CHXAudioSession::HXDeviceSetupCallback::QueryInterface(REFIID riid, void** ppvObj)
{
    QInterfaceList  qiList[] =
        {
            { GET_IIDHANDLE(IID_IUnknown), (IUnknown*)(IHXAudioDeviceResponse*)this},
            { GET_IIDHANDLE(IID_IHXInterruptSafe), (IHXInterruptSafe*)this  },
            { GET_IIDHANDLE(IID_IHXCallback),  (IHXCallback*)this   }
        };

    return ::QIFind(qiList, QILISTSIZE(qiList), riid, ppvObj);
}

STDMETHODIMP_(ULONG32) CHXAudioSession::HXDeviceSetupCallback::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

STDMETHODIMP_(ULONG32) CHXAudioSession::HXDeviceSetupCallback::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }

    delete this;
    return 0;
}

STDMETHODIMP CHXAudioSession::HXDeviceSetupCallback::Func(void)
{
    m_ulCallbackID = 0;
    if(m_pAudioSessionObject)
    {
        m_pAudioSessionObject->ReopenDevice();
    }
    return HXR_OK;
}

STDMETHODIMP_(BOOL) CHXAudioSession::HXDeviceSetupCallback::IsInterruptSafe()
{
    return TRUE;
}

#if defined(HELIX_FEATURE_TIMELINE_WATCHER)
HX_RESULT CHXAudioSession::AddTimelineWatcher( IHXTimelineWatcher* pWatcher )
{
    HX_RESULT res = HXR_FAIL;

    if( !m_pTimeLineWatchers )
    {
        m_pTimeLineWatchers = new CHXSimpleList();
        if( !m_pTimeLineWatchers )
        {
            return HXR_OUTOFMEMORY;
        }
    }
    
    
    LISTPOSITION lPosition = m_pTimeLineWatchers->Find(pWatcher);
    if(!lPosition)
    {
        res = HXR_OUTOFMEMORY;
        if( m_pTimeLineWatchers->AddTail(pWatcher) )
        {
            pWatcher->AddRef();
            res = HXR_OK;
        }
    }
    
    return res;
}

HX_RESULT CHXAudioSession::RemoveTimelineWatcher( IHXTimelineWatcher* pWatcher )
{
    HX_RESULT res = HXR_FAIL;

    if( m_pTimeLineWatchers )
    {
        LISTPOSITION lPosition = m_pTimeLineWatchers->Find(pWatcher);
        if(lPosition)
        {
            m_pTimeLineWatchers->RemoveAt(lPosition);
            HX_RELEASE(pWatcher);
            res = HXR_OK;
        }
    }
    return res;
}

void CHXAudioSession::_NotifyTimelineWatchers( const int nWhich, const UINT32 ulNow)
{
    if( m_pTimeLineWatchers )
    {
        
        LISTPOSITION pos = m_pTimeLineWatchers->GetHeadPosition();
        while( pos )
        {
            IHXTimelineWatcher* pWatcher = (IHXTimelineWatcher*)m_pTimeLineWatchers->GetNext(pos);
            switch( nWhich )
            {
               case TLW_PAUSE:
                   pWatcher->OnPause();
                   break;
               case TLW_RESUME:
                   pWatcher->OnResume();
                   break;
               case TLW_CLOSE:
                   pWatcher->OnClose();
                   break;
               case TLW_TIMESYNC:
                   pWatcher->OnTimeSync(ulNow);
                   break;
               default:
                   HX_ASSERT("Unknown timeline watcher action."==NULL);
            }
        }
    }
}
#endif

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