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hxausvc.h：源码内容
							/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 
#ifndef _HXAUSVC_H_
#define _HXAUSVC_H_
#define     HX_MAX_VOLUME  100
#define     HX_INIT_VOLUME 50
#define     HX_MIN_VOLUME  0
/****************************************************************************
 *
 * Forward declarations of some interfaces defined here-in.
 */
typedef _INTERFACE   IHXAudioPlayer		    IHXAudioPlayer;
typedef _INTERFACE   IHXAudioPlayerResponse	    IHXAudioPlayerResponse;
typedef _INTERFACE   IHXAudioStream		    IHXAudioStream;
typedef _INTERFACE   IHXAudioStream2		    IHXAudioStream2;
typedef _INTERFACE   IHXAudioDevice		    IHXAudioDevice;
typedef _INTERFACE   IHXAudioDeviceResponse	    IHXAudioDeviceResponse;
typedef _INTERFACE   IHXAudioHook		    IHXAudioHook;
typedef _INTERFACE   IHXAudioStreamInfoResponse    IHXAudioStreamInfoResponse;
// $Private:
typedef _INTERFACE   IHXMultiPlayPauseSupport	    IHXMultiPlayPauseSupport;
typedef _INTERFACE   IHXAudioDeviceManager2	    IHXAudioDeviceManager2;
typedef _INTERFACE   IHXAudioResampler		    IHXAudioResampler;
typedef _INTERFACE   IHXAudioResamplerManager	    IHXAudioResamplerManager;
typedef _INTERFACE   IHXAudioPushdown2		    IHXAudioPushdown2;
// $EndPrivate.
typedef _INTERFACE   IHXVolume			    IHXVolume;
typedef _INTERFACE   IHXVolumeAdviseSink	    IHXVolumeAdviseSink;
typedef _INTERFACE   IHXDryNotification	    IHXDryNotification;
typedef _INTERFACE   IHXBuffer			    IHXBuffer;
typedef _INTERFACE   IHXValues			    IHXValues;
/****************************************************************************
 *
 *	Audio Services Data Structures
 */
typedef struct _HXAudioFormat
{
    UINT16	uChannels;	/* Num. of Channels (1=Mono, 2=Stereo, etc. */
    UINT16	uBitsPerSample;	/* 8 or 16				    */
    UINT32	ulSamplesPerSec;/* Sampling Rate			    */
    UINT16	uMaxBlockSize;	/* Max Blocksize			    */
} HXAudioFormat;
typedef enum _AudioStreamType
{
    STREAMING_AUDIO	= 0,
    INSTANTANEOUS_AUDIO = 1,
    TIMED_AUDIO		= 2,
    STREAMING_INSTANTANEOUS_AUDIO = 3
} AudioStreamType;
typedef struct _HXAudioData
{
    IHXBuffer*	    pData;		/* Audio data			    */ 
    ULONG32	    ulAudioTime;	/* Start time in milliseconds	    */
    AudioStreamType uAudioStreamType;
} HXAudioData;
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioPlayer
 * 
 *  Purpose:
 * 
 *  This interface provides access to the Audio Player services. Use this
 *  interface to create audio streams, "hook" post-mixed audio data, and to
 *  control volume levels.
 * 
 *  IID_IHXAudioPlayer:
 * 
 *  {00000700-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioPlayer, 0x00000700, 0x901, 0x11d1, 0x8b, 0x6, 0x0, 
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioPlayer
DECLARE_INTERFACE_(IHXAudioPlayer, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
                    REFIID riid,
                    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioPlayer methods
     */
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::CreateAudioStream
    *  Purpose:
    *		Call this to create an audio stream.
    */
    STDMETHOD(CreateAudioStream)    (THIS_
				    IHXAudioStream** /*OUT*/ pAudioStream
				    ) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::AddPostMixHook
    *  Purpose:
    *		Call this to hook audio data after all audio streams in this
    *		have been mixed.
    */
    STDMETHOD(AddPostMixHook)	(THIS_
				IHXAudioHook*	    /*IN*/ pHook,
				const BOOL	    /*IN*/ bDisableWrite,
				const BOOL	    /*IN*/ bFinal
				) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::RemovePostMixHook
    *  Purpose:
    *		Call this to remove an already added post hook.
    */
    STDMETHOD(RemovePostMixHook)    (THIS_
				    IHXAudioHook*    /*IN*/ pHook
				    ) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::GetAudioStreamCount
    *  Purpose:
    *		Get the number of audio streams currently active in the 
    *		audio player. Since streams can be added mid-presentation
    *		this function may return different values on different calls.
    *		If the user needs to know about all the streams as they get
    *		get added to the player, IHXAudioStreamInfoResponse should
    *		be implemented and passed in SetStreamInfoResponse.
    */
    STDMETHOD_(UINT16,GetAudioStreamCount) (THIS) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::GetAudioStream
    *  Purpose:
    *		Get an audio stream at position given. 
    */
    STDMETHOD_(IHXAudioStream*,GetAudioStream) (THIS_
						UINT16	/*IN*/ uIndex
						) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::SetStreamInfoResponse
    *  Purpose:
    *		Set a stream info response interface. A client must implement
    *		an IHXAudioStreamInfoResponse and then call this method with
    *		the IHXAudioStreamInfoResponse as the parameter. The audio
    *		player will call IHXAudioStreamInfoResponse::OnStreamsReady
    *		with the total number of audio streams associated with this 
    *		audio player.
    */
    STDMETHOD(SetStreamInfoResponse)	(THIS_
				IHXAudioStreamInfoResponse* /*IN*/ pResponse
					) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::RemoveStreamInfoResponse
    *  Purpose:
    *		Remove stream info response that was added earlier
    */
    STDMETHOD(RemoveStreamInfoResponse) (THIS_
				IHXAudioStreamInfoResponse* /*IN*/ pResponse
				) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::GetAudioVolume
    *  Purpose:
    *		Get the audio player's volume interface. This volume controls
    *		the volume level of all the mixed audio streams for this 
    *		audio player.
    */
    STDMETHOD_(IHXVolume*,GetAudioVolume) (THIS) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioPlayer::GetDeviceVolume
    *  Purpose:
    *		Get the audio device volume interface. This volume controls
    *		the audio device volume levels.
    */
    STDMETHOD_(IHXVolume*,GetDeviceVolume) (THIS) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioPlayerResponse
 * 
 *  Purpose:
 * 
 *  This interface provides access to the Audio Player Response. Use this 
 *  to receive audio player playback notifications. Your implementation of
 *  OnTimeSync() is called with the current audio playback time (millisecs).
 *  This interface is currently to be used ONLY by the RMA engine internally.
 * 
 *  IID_IHXAudioPlayerResponse:
 * 
 *  {00000701-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioPlayerResponse, 0x00000701, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioPlayerResponse
DECLARE_INTERFACE_(IHXAudioPlayerResponse, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
                    REFIID riid,
                    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioPlayerResponse methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioPlayerResponse::OnTimeSync
     *  Purpose:
     *	    This method is called with the current audio playback time.
     */
    STDMETHOD(OnTimeSync)   (THIS_
			    ULONG32 /*IN*/ ulTimeEnd
			    ) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *      IHXAudioStream
 * 
 *  Purpose:
 * 
 *  This interface provides access to an Audio Stream. Use this to play
 *  audio, "hook" audio stream data, and to get audio stream information.
 * 
 *  IID_IHXAudioStream:
 * 
 *      {00000702-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioStream, 0x00000702, 0x901, 0x11d1, 0x8b, 0x6, 0x0, 
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioStream
DECLARE_INTERFACE_(IHXAudioStream, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)		(THIS_
					REFIID riid,
					void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)		(THIS) PURE;
    STDMETHOD_(ULONG32,Release)		(THIS) PURE;
    
    /*
     *  IHXAudioStream methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioStream::Init
     *  Purpose:
     *	    Initialize an audio stream with the given audio format. The 
     *	    IHXValues contains stream identification information. 
     */
    STDMETHOD(Init)	(THIS_
			const HXAudioFormat* /*IN*/ pAudioFormat,
			IHXValues*	/*IN*/  pValues
			) PURE;
    /************************************************************************
     *  Method:
     *      IHXAudioStream::Write
     *  Purpose:
     *	    Write audio data to Audio Services. 
     *	    
     *	    NOTE: If the renderer loses packets and there is no loss
     *	    correction, then the renderer should write the next packet 
     *	    using a meaningful start time.  Audio Services will play 
     *      silence where packets are missing.
     */
    STDMETHOD(Write)	(THIS_
			HXAudioData*		/*IN*/	pAudioData
			) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioStream::AddPreMixHook
    *  Purpose:
    *		Use this to "hook" audio stream data prior to the mixing.
    *		Set bDisableWrite to TRUE to prevent this audio stream data
    *		from being mixed with other audio stream data associated
    *		with this audio player.
    */
    STDMETHOD(AddPreMixHook) (THIS_
                             IHXAudioHook*    	/*IN*/ pHook,
			     const BOOL	      	/*IN*/ bDisableWrite
			     ) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioStream::RemovePreMixHook
    *  Purpose:
    *		Use this to remove an already added "hook".
    */
    STDMETHOD(RemovePreMixHook) (THIS_
                            	IHXAudioHook*    	/*IN*/ pHook
			     	) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioStream::AddDryNotification
    *  Purpose:
    *	    Use this to add a notification response object to get 
    *	    notifications when audio stream is running dry.
    */
    STDMETHOD(AddDryNotification)   (THIS_
                            	    IHXDryNotification* /*IN*/ pNotification
			     	    ) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioStream::GetStreamInfo
    *  Purpose:
    *		Use this to get information specific to this audio stream.
    */
    STDMETHOD_(IHXValues*,GetStreamInfo)      	(THIS) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioStream::GetAudioVolume
    *  Purpose:
    *		Get the audio stream's volume interface. This volume controls
    *		the volume level for this audio stream.
    */
    STDMETHOD_(IHXVolume*,GetAudioVolume) (THIS) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *	IHXAudioDevice
 * 
 *  Purpose:
 * 
 *	Object that exports audio device API
 *	This interface is currently to be used ONLY by the RMA engine 
 *	internally.
 * 
 *  IID_IHXAudioDevice:
 * 
 *	{00000703-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioDevice, 0x00000703, 0x901, 0x11d1, 0x8b, 0x6, 0x0, 
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioDevice
DECLARE_INTERFACE_(IHXAudioDevice, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
                    REFIID riid,
                    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioDevice methods
     */
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::Open
    *  Purpose:
    *	    The caller calls this to open the audio device using the audio
    *	    format given.
    */
    STDMETHOD(Open) (THIS_
		    const HXAudioFormat*	/*IN*/ pAudioFormat,
		    IHXAudioDeviceResponse*	/*IN*/ pStreamResponse) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioDevice::Close
    *  Purpose:
    *		The caller calls this to close the audio device.
    */
    STDMETHOD(Close)	(THIS_
			const BOOL  /*IN*/ bFlush ) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::Resume
    *  Purpose:
    *	    The caller calls this to start or resume audio playback.
    */
    STDMETHOD(Resume)         (THIS) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::Pause
    *  Purpose:
    *	    The caller calls this to pause the audio device. If bFlush is
    *	    TRUE, any buffers in the audio device will be flushed; otherwise,
    *	    the buffers are played.
    */
    STDMETHOD(Pause)         (THIS) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::Write
    *  Purpose:
    *	    The caller calls this to write an audio buffer.
    */
    STDMETHOD(Write)         (THIS_
			     const HXAudioData* /*IN*/ pAudioData) PURE;
    /************************************************************************
    *  Method:
    *      IHXAudioDevice::InitVolume
    *  Purpose:
    *	    The caller calls this to inform the audio stream of the client's
    *	    volume range. The audio stream maps the client's volume range
    *	    into the audio device volume range. 
    *	    NOTE: This function returns TRUE if volume is supported by this 
    *	    audio device.
    */
    STDMETHOD_(BOOL,InitVolume)  (THIS_
				 const UINT16	/*IN*/ uMinVolume,
				 const UINT16	/*IN*/ uMaxVolume) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::SetVolume
    *  Purpose:
    *	    The caller calls this to set the audio device volume level.
    */
    STDMETHOD(SetVolume)         (THIS_
				 const UINT16    /*IN*/ uVolume) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::GetVolume
    *  Purpose:
    *	    The caller calls this to get the audio device volume level.
    */
    STDMETHOD_(UINT16,GetVolume) (THIS) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::Reset
    *  Purpose:
    *	    The caller calls this to reset the audio device.
    */
    STDMETHOD(Reset)		(THIS) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::Drain
    *  Purpose:
    *	    The caller calls this to drain the audio device.
    */
    STDMETHOD(Drain)		(THIS) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::CheckFormat
    *  Purpose:
    *	    The caller calls this to check the input format with the
    *	    audio device format.
    */
    STDMETHOD(CheckFormat)  (THIS_
			    const HXAudioFormat* /*IN*/ pAudioFormat ) PURE;
    /************************************************************************
    *  Method:
    *	    IHXAudioDevice::GetCurrentAudioTime
    *  Purpose:
    *	    The caller calls this to get current system audio time.
    */
    STDMETHOD(GetCurrentAudioTime)  (THIS_
				    REF(ULONG32) /*OUT*/ ulCurrentTime) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 *	IHXAudioDeviceResponse
 * 
 *  Purpose:
 * 
 *	Object that exports audio device Response API
 *	This interface is currently to be used ONLY by the RMA engine 
 *	internally.
 * 
 *  IID_IHXAudioDeviceResponse:
 * 
 *  {00000704-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioDeviceResponse, 0x00000704, 0x901, 0x11d1, 0x8b, 0x6, 
	    0x0, 0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioDeviceResponse
DECLARE_INTERFACE_(IHXAudioDeviceResponse, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
                    REFIID riid,
                    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioDeviceResponse methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioDeviceResponse::OnTimeSync
     *  Purpose:
     *      Notification interface provided by users of the IHXAudioDevice
     *      interface. This method is called by the IHXAudioDevice when
     *      audio playback occurs.
     */
    STDMETHOD(OnTimeSync)         (THIS_
                    		ULONG32         		/*IN*/ ulTimeEnd) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioHook
 * 
 *  Purpose:
 * 
 *  Clients must implement this interface to access pre- or post-mixed 
 *  audio data. Use this interface to get post processed audio buffers and
 *  their associated audio format.
 *
 *  IID_IHXAudioHook:
 * 
 *  {00000705-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioHook, 0x00000705, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioHook
DECLARE_INTERFACE_(IHXAudioHook, IUnknown)
{
    /*
     *  IUnknown methods!
     */
    STDMETHOD(QueryInterface)		(THIS_
                    REFIID riid,
                    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)		(THIS) PURE;
    STDMETHOD_(ULONG32,Release)		(THIS) PURE;
    /*
     *  IHXAudioHook methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioHook::OnInit
     *  Purpose:
     *      Audio Services calls OnInit() with the audio data format of the
     *	    audio data that will be provided in the OnBuffer() method.
     */
    STDMETHOD(OnInit)		(THIS_
                    		HXAudioFormat*	/*IN*/ pFormat) PURE;
    /************************************************************************
     *  Method:
     *      IHXAudioHook::OnBuffer
     *  Purpose:
     *      Audio Services calls OnBuffer() with audio data packets. The
     *	    renderer should not modify the data in the IHXBuffer part of
     *	    pAudioInData.  If the renderer wants to write a modified
     *	    version of the data back to Audio Services, then it should 
     *	    create its own IHXBuffer, modify the data and then associate 
     *	    this buffer with the pAudioOutData->pData member.
     */
    STDMETHOD(OnBuffer)		(THIS_
                    		HXAudioData*	/*IN*/   pAudioInData,
                    		HXAudioData*	/*OUT*/  pAudioOutData) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioStreamInfoResponse
 * 
 *  Purpose:
 * 
 *  Clients must implement this interface when interested in receiving
 *  notification of the total number of streams associated with this
 *  audio player.
 *
 *  IID_IHXAudioStreamInfoResponse:
 * 
 *  {00000706-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioStreamInfoResponse, 0x00000706, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioStreamInfoResponse
DECLARE_INTERFACE_(IHXAudioStreamInfoResponse, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
                    REFIID riid,
                    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioStreamInfoResponse methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioStreamInfoResponse::OnStream
     *  Purpose:
     *	    The client implements this to get notification of streams 
     *	    associated with this player. Use 
     *	    AudioPlayer::SetStreamInfoResponse() to register your 
     *	    implementation with the AudioPlayer. Once player has been 
     *	    initialized, it will call OnStream() multiple times to pass all 
     *	    the streams. Since a stream can be added mid-presentation, 
     *	    IHXAudioStreamInfoResponse object should be written to handle 
     *	    OnStream() in the midst of the presentation as well.
     */
    STDMETHOD(OnStream) (THIS_
			IHXAudioStream* /*IN*/ pAudioStream) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXVolume
 * 
 *  Purpose:
 * 
 *  This interface provides access to Audio Services volume control. Use this
 *  interface to get, set, or receive notifications of volume changes. Audio
 *  Services implements IHXVolume for IHXAudioPlayer, IHXAudioStream and 
 *  for the audio device. Clients can use the IHXVolume interface to get/set
 *  volume levels of each audio stream, to get/set volume levels for the 
 *  audio player's mixed data, or to get/set the volume levels of the audio 
 *  device. See AudioStream::GetStreamVolume() (TBD), AudioPlayer::
 *  GetAudioVolume() and AudioPlayer::GetDeviceVolume().
 *
 *  IID_IHXVolume:
 * 
 *  {00000707-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXVolume, 0x00000707, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXVolume
DECLARE_INTERFACE_(IHXVolume, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
                    REFIID riid,
                    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXVolume methods
     */
    /************************************************************************
     *  Method:
     *      IHXVolume::SetVolume
     *  Purpose:
     *	    Call this to set the volume level.
     */
    STDMETHOD(SetVolume) (THIS_
                         const	UINT16	/*IN*/ uVolume ) PURE;
    /************************************************************************
     *  Method:
     *      IHXVolume::GetVolume
     *  Purpose:
     *	    Call this to get the current volume level.
     */
    STDMETHOD_(UINT16,GetVolume)   (THIS) PURE;
     /************************************************************************
     *  Method:
     *      IHXVolume::SetMute
     *  Purpose:
     *	    Call this to mute the volume.
     */
    STDMETHOD(SetMute)   (THIS_
                         const	BOOL	/*IN*/ bMute ) PURE;
     /************************************************************************
     *  Method:
     *      IHXVolume::GetMute
     *  Purpose:
     *	    Call this to determine if the volume is muted.
     *	  
     */
    STDMETHOD_(BOOL,GetMute)       (THIS) PURE;
     /************************************************************************
     *  Method:
     *      IHXVolume::AddAdviseSink
     *  Purpose:
     *	    Call this to register an IHXVolumeAdviseSink. The advise sink
     *	    methods: OnVolumeChange() and OnMuteChange() are called when
     *	    ever IHXVolume::SetVolume() and IHXVolume::SetMute() are
     *	    called.
     */
    STDMETHOD(AddAdviseSink)	(THIS_
				 IHXVolumeAdviseSink* /*IN*/	pSink
				) PURE;
     /************************************************************************
     *  Method:
     *      IHXVolume::RemoveAdviseSink
     *  Purpose:
     *	    Call this to unregister an IHXVolumeAdviseSink. Use this when
     *	    you are no longer interested in receiving volume or mute change
     *	    notifications.
     */
    STDMETHOD(RemoveAdviseSink)	(THIS_
				 IHXVolumeAdviseSink* /*IN*/	pSink
				) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXVolumeAdviseSink
 * 
 *  Purpose:
 * 
 *  This interface provides access to notifications of volume changes. A 
 *  client must implement this interface if they are interested in receiving 
 *  notifications of volume level changes or mute state changes. A client must 
 *  register their volume advise sink using IHXVolume::AddAdviseSink().
 *  See the IHXVolume interface.
 * 
 *  IID_IHXVolumeAdviseSink:
 * 
 *  {00000708-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXVolumeAdviseSink, 0x00000708, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXVolumeAdviseSink
DECLARE_INTERFACE_(IHXVolumeAdviseSink, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
                    REFIID riid,
                    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXVolumeAdviseSink methods
     */
    /************************************************************************
     *  Method:
     *      IHXVolumeAdviseSink::OnVolumeChange
     *  Purpose:
     *	    This interface is called whenever the associated IHXVolume
     *	    SetVolume() is called.
     */
    STDMETHOD(OnVolumeChange)	(THIS_ 
				const UINT16 uVolume
				) PURE;
    /************************************************************************
     *  Method:
     *      IHXVolumeAdviseSink::OnMuteChange
     *  Purpose:
     *	    This interface is called whenever the associated IHXVolume
     *	    SetMute() is called.
     *    
     */
    STDMETHOD(OnMuteChange)     (THIS_
				const BOOL bMute
				) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXDryNotification
 * 
 *  Purpose:
 * 
 *  Audio Renderer should implement this if it needs notification when the 
 *  audio stream is running dry. 
 *
 *  IID_IHXDryNotification:
 * 
 *  {00000709-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXDryNotification, 0x00000709, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXDryNotification
DECLARE_INTERFACE_(IHXDryNotification, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
				    REFIID riid,
				    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXDryNotification methods
     */
    /************************************************************************
     *  Method:
     *      IHXDryNotification::OnDryNotification
     *  Purpose:
     *	    This function is called when it is time to write to audio device 
     *	    and there is not enough data in the audio stream. The renderer can
     *	    then decide to add more data to the audio stream. This should be 
     *	    done synchronously within the call to this function.
     *	    It is OK to not write any data. Silence will be played instead.
     */
    STDMETHOD(OnDryNotification)    (THIS_
				    UINT32 /*IN*/ ulCurrentStreamTime,
				    UINT32 /*IN*/ ulMinimumDurationRequired
				    ) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioDeviceManager
 * 
 *  Purpose:
 * 
 *  Allows the default audio device to be replaced.
 *
 *  IID_IHXAudioDeviceManager:
 * 
 *  {0000070A-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioDeviceManager, 0x0000070A, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioDeviceManager
DECLARE_INTERFACE_(IHXAudioDeviceManager, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
				    REFIID riid,
				    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioDeviceManager methods
     */
    /**********************************************************************
     *  Method:
     *      IHXAudioDeviceManager::Replace
     *  Purpose:
     *  This is used to replace the default implementation of the audio
     *  device by the given audio device interface. 
     */
    STDMETHOD(Replace)         (THIS_
		    IHXAudioDevice*    /*IN*/ pAudioDevice) PURE;
    /**********************************************************************
     *  Method:
     *      IHXAudioDeviceManager::Remove
     *  Purpose:
     *  This is used to remove the audio device given to the manager in
     *  the earlier call to Replace.
     */
    STDMETHOD(Remove)         (THIS_
		    IHXAudioDevice*    /*IN*/ pAudioDevice) PURE;
    /************************************************************************
    *  Method:
    *   IHXAudioDeviceManager::AddFinalHook
    *  Purpose:
    *	One last chance to modify data being written to the audio device.
    *	This hook allows the user to change the audio format that
    *   is to be written to the audio device. This can be done in call
    *   to OnInit() in IHXAudioHook.
    */
    STDMETHOD(SetFinalHook)	(THIS_
				IHXAudioHook*	    /*IN*/ pHook
				) PURE;
    /************************************************************************
    *  Method:
    *   IHXAudioDeviceManager::RemoveFinalHook
    *  Purpose:
    *	Remove final hook
    */
    STDMETHOD(RemoveFinalHook)	(THIS_
				IHXAudioHook*    /*IN*/ pHook
				) PURE;
   /************************************************************************
    *  Method:
    *   IHXAudioDeviceManager::GetAudioFormat
    *  Purpose:
    *	Returns the audio format in which the audio device is opened.
    *	This function will fill in the pre-allocated HXAudioFormat 
    *	structure passed in.
    */
    STDMETHOD(GetAudioFormat)   (THIS_
			        HXAudioFormat*	/*IN/OUT*/pAudioFormat) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *      IHXAudioCrossFade
 * 
 *  Purpose:
 *
 *  This interface can be used to cross-fade two audio streams. It is exposed 
 *  by IHXAudioPlayer
 * 
 *  IID_IHXAudioCrossFade:
 * 
 *  {0000070B-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioCrossFade, 0x0000070B, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioCrossFade
DECLARE_INTERFACE_(IHXAudioCrossFade, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)		(THIS_
					REFIID riid,
					void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)		(THIS) PURE;
    STDMETHOD_(ULONG32,Release)		(THIS) PURE;
    
    /*
     *  IHXAudioCrossFade methods
     */
    /************************************************************************
     *  Method:
     *      IHXAudioCrossFade::CrossFade
     *  Purpose:
     *	    Cross-fade two audio streams.
     *	    pStreamFrom		    - Stream to be cross faded from
     *	    pStreamTo		    - Stream to be cross faded to
     *	    ulFromCrossFadeStartTime- "From" Stream time when cross fade is 
     *				      to be started
     *	    ulToCrossFadeStartTime  - "To" Stream time when cross fade is to 
     *				      be started
     *	    ulCrossFadeDuration	    - Duration over which cross-fade needs
     *				      to be done
     *	    
     */
    STDMETHOD(CrossFade)	(THIS_
				IHXAudioStream* pStreamFrom,
				IHXAudioStream* pStreamTo,
				UINT32		 ulFromCrossFadeStartTime,
				UINT32		 ulToCrossFadeStartTime,
				UINT32		 ulCrossFadeDuration) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *      IHXAudioStream2
 * 
 *  Purpose:
 *
 *  This interface contains some last-minute added audio stream functions
 * 
 *  IID_IHXAudioStream2:
 * 
 *  {0000070C-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioStream2, 0x0000070C, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioStream2
DECLARE_INTERFACE_(IHXAudioStream2, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)		(THIS_
					REFIID riid,
					void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)		(THIS) PURE;
    STDMETHOD_(ULONG32,Release)		(THIS) PURE;
    
    /*
     *  IHXAudioStream2 methods
     */
   /************************************************************************
    *  Method:
    *      IHXAudioStream2::RemoveDryNotification
    *  Purpose:
    *	    Use this to remove itself from the notification response object
    *	    during the stream switching.
    */
    STDMETHOD(RemoveDryNotification)   (THIS_
				   IHXDryNotification* /*IN*/ pNotification
			     		) PURE;
   /************************************************************************
    *  Method:
    *      IHXAudioStream2::GetAudioFormat
    *  Purpose:
    *	    Returns the input audio format of the data written by the 
    *	    renderer. This function will fill in the pre-allocated 
    *	    HXAudioFormat structure passed in.
    */
    STDMETHOD(GetAudioFormat)   (THIS_
			        HXAudioFormat*	/*IN/OUT*/pAudioFormat) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *      IHXAudioPushdown
 * 
 *  Purpose:
 *
 *  This interface can be used to setup the audio pushdown time.
 * 
 *  IID_IHXAudioPushdown:
 * 
 *  {0000070D-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioPushdown, 0x0000070D, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioPushdown
DECLARE_INTERFACE_(IHXAudioPushdown, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)		(THIS_
					REFIID riid,
					void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)		(THIS) PURE;
    STDMETHOD_(ULONG32,Release)		(THIS) PURE;
    
    /*
     *  IHXAudioPushdown methods
     */
   /************************************************************************
    *  Method:
    *      IHXAudioPushdown::SetAudioPushdown
    *  Purpose:
    *	    Use this to set the minimum audio pushdown value in ms.
    *	    This is the amount of audio data that is being written 
    *	    to the audio device before starting playback.
    */
    STDMETHOD(SetAudioPushdown)   (THIS_
				   UINT32 /*IN*/ ulAudioPushdown
			     	  ) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *      IHXAudioHookManager
 * 
 *  Purpose:
 *
 *  This interface can be used to add a hook at the audio device layer.
 * 
 *  IID_IHXAudioHookManager:
 * 
 *  {0000070E-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioHookManager, 0x0000070E, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioHookManager
DECLARE_INTERFACE_(IHXAudioHookManager, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)		(THIS_
					REFIID riid,
					void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)		(THIS) PURE;
    STDMETHOD_(ULONG32,Release)		(THIS) PURE;
    
   /*
    *  IHXAudioHookManager methods
    */
   /************************************************************************
    *  Method:
    *      IHXAudioHookManager::AddHook
    *  Purpose:
    *	    Use this to add a hook 
    */
    STDMETHOD(AddHook)   (THIS_
			  IHXAudioHook* /*IN*/ pHook
			  ) PURE;
   /************************************************************************
    *  Method:
    *      IHXAudioHookManager::RemoveHook
    *  Purpose:
    *	    Use this to remove a hook 
    */
    STDMETHOD(RemoveHook) (THIS_
			  IHXAudioHook* /*IN*/ pHook
			  ) PURE;
};
// $Private:
/****************************************************************************
 * 
 *  Interface:
 * 
 *      IHXMultiPlayPauseSupport
 * 
 *  Purpose:
 *
 *  This interface can be used to control whether audio services handles multi-player pause / rewind support
 * 
 *  IID_IHXMultiPlayPauseSupport:
 * 
 *  {0000070F-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXMultiPlayPauseSupport, 
	    0x0000070F, 0x901, 0x11d1, 0x8b, 0x6, 0x0, 0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXMultiPlayPauseSupport
DECLARE_INTERFACE_(IHXMultiPlayPauseSupport, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)		(THIS_
					REFIID riid,
					void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)		(THIS) PURE;
    STDMETHOD_(ULONG32,Release)		(THIS) PURE;
    
   /*
    *  IHXMultiPlayPauseSupport methods
    */
    STDMETHOD_(BOOL,GetDisableMultiPlayPauseSupport)	(THIS) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioDeviceManager2
 * 
 *  Purpose:
 * 
 *  Audio Device Manager extension
 *
 *  IID_IHXAudioDeviceManager2:
 * 
 *  {00000710-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioDeviceManager2, 0x00000710, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioDeviceManager2
DECLARE_INTERFACE_(IHXAudioDeviceManager2, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
				    REFIID riid,
				    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioDeviceManager2 methods
     */
    /**********************************************************************
     *  Method:
     *      IHXAudioDeviceManager2::IsReplacedDevice
     *  Purpose:
     *  This is used to determine if the audio device has been replaced.
     */
    STDMETHOD_(BOOL, IsReplacedDevice)         (THIS) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioResampler
 * 
 *  Purpose:
 * 
 *  Audio Resampler
 *
 *  IID_IHXAudioResampler:
 * 
 *  {00000711-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioResampler, 0x00000711, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioResampler
DECLARE_INTERFACE_(IHXAudioResampler, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
				    REFIID riid,
				    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioResampler methods
     */
    /**********************************************************************
     *  Method:
     *      IHXAudioResampler::Resample
     *  Purpose:
     *  Will produce 1 output frame for every (upFactor/downFactor) inputs
     *  frames, straddling if not an integer.  Works down to 1 sample/call.
     * 
     *  Returns actual number of output frames.
     ***********************************************************************/
    STDMETHOD_(UINT32, Resample)    (   THIS_
                                        UINT16*	pInput, 
                                        UINT32	ulInputBytes, 
                                        UINT16*	pOutput) PURE;
    /**********************************************************************
     *  Method:
     *      IHXAudioResampler::Requires
     *  Purpose:
     *  Returns number of input frames required to produce this number
     *  of output frames, given the current state of the filter.
     */
    STDMETHOD_(UINT32, Requires)    (   THIS_
                                        UINT32	ulOutputFrames) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioResamplerManager
 * 
 *  Purpose:
 * 
 *  Audio Resampler Manager
 *
 *  IID_IHXAudioResamplerManager:
 * 
 *  {00000712-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioResamplerManager, 0x00000712, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioResamplerManager
DECLARE_INTERFACE_(IHXAudioResamplerManager, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
				    REFIID riid,
				    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
    /*
     *  IHXAudioResamplerManager methods
     *
     */
    STDMETHOD(CreateResampler)	(THIS_
				HXAudioFormat		    inAudioFormat,
				REF(HXAudioFormat)	    outAudioFormat,
				REF(IHXAudioResampler*)    pResampler) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioPushdown2
 * 
 *  Purpose:
 * 
 *  Audio PushDown access methods
 *
 *  IID_IHXAudioPushdown2:
 * 
 *  {00000713-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioPushdown2, 0x00000713, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioPushdown2
DECLARE_INTERFACE_(IHXAudioPushdown2, IHXAudioPushdown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
				    REFIID riid,
				    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
   /************************************************************************
    *  Method:
    *      IHXAudioPushdown::SetAudioPushdown
    *  Purpose:
    *	    Use this to set the minimum audio pushdown value in ms.
    *	    This is the amount of audio data that is being written 
    *	    to the audio device before starting playback.
    */
    STDMETHOD(SetAudioPushdown)			(THIS_
						UINT32	/*IN */ ulAudioPushdown) PURE;
   /************************************************************************
    *  Method:
    *      IHXAudioPushdown2::GetAudioPushdown
    *  Purpose:
    *	    Use this to get the minimum audio pushdown value in ms.
    *	    This is the amount of audio data that is being written 
    *	    to the audio device before starting playback.
    */
    STDMETHOD(GetAudioPushdown)			(THIS_
						REF(UINT32) /*OUT*/ ulAudioPushdown) PURE;
   /************************************************************************
    *  Method:
    *      IHXAudioPushdown2::GetCurrentAudioDevicePushdown
    *  Purpose:
    *	    Use this to get the audio pushed down to the audio device and haven't
    *	    been played yet
    */
    STDMETHOD(GetCurrentAudioDevicePushdown)   (THIS_
						REF(UINT32) /*OUT*/ ulAudioPusheddown) PURE;
};
/****************************************************************************
 * 
 *  Interface:
 * 
 *  IHXAudioMultiChannel
 * 
 *  Purpose:
 * 
 *  Multi-channel audio support
 *
 *  IID_IHXAudioMultiChannel:
 * 
 *  {00000714-0901-11d1-8B06-00A024406D59}
 * 
 */
DEFINE_GUID(IID_IHXAudioMultiChannel, 0x00000714, 0x901, 0x11d1, 0x8b, 0x6, 0x0,
            0xa0, 0x24, 0x40, 0x6d, 0x59);
#undef  INTERFACE
#define INTERFACE   IHXAudioMultiChannel
DECLARE_INTERFACE_(IHXAudioMultiChannel, IUnknown)
{
    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
				    REFIID riid,
				    void** ppvObj) PURE;
    STDMETHOD_(ULONG32,AddRef)      (THIS) PURE;
    STDMETHOD_(ULONG32,Release)     (THIS) PURE;
   /*
    *  IHXAudioMultiChannel methods
    */
    STDMETHOD_(BOOL,GetMultiChannelSupport)    (THIS) PURE;
};
// $EndPrivate.
#endif  /* _HXAUSVC_H_ */

						