audbeos.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: audbeos.h,v 1.1.1.1.50.1 2004/07/09 02:02:00 hubbe 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
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
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 * "GPL") in which case the provisions of the GPL are applicable
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 * ***** END LICENSE BLOCK ***** */

/*******************************************************************
 *
 *	audbeos.h
 *
 *	CLASS: CAudioOutBeOS
 *	
 *	DESCRIPTION: Class definition for BeOS-specific audio devices 
 *
 *******************************************************************/

#ifndef _AUDBEOS_H_
#define _AUDBEOS_H_

#include <GameSoundDefs.h>

struct IHXCallback;
class BPushGameSound;

#define _BEOS_AUDIODEV_CALLBACK		0

class CAudioOutBeOS : public CHXAudioDevice
{
public:
	CAudioOutBeOS();

#if _BEOS_AUDIODEV_CALLBACK
	/* Create friend class for scheduled playback callback.
	*/
	class HXPlaybackCountCb : public IHXCallback
	{
	private:
		LONG32			m_lRefCount;
		~HXPlaybackCountCb();

		PRIVATE_DESTRUCTORS_ARE_NOT_A_CRIME

	public:
		HXPlaybackCountCb(BOOL timed = TRUE);

		BOOL			m_timed;
		CAudioOutBeOS	*m_pAudioDeviceObject;

		/*
		*  IUnknown methods
		*/
		STDMETHOD(QueryInterface) (THIS_
							REFIID riid,
							void** ppvObj);

		STDMETHOD_(ULONG32,AddRef) (THIS);

		STDMETHOD_(ULONG32,Release) (THIS);
		/*
		*  IHXCallback methods
		*/
		STDMETHOD(Func) (THIS);
	};
	friend HXPlaybackCountCb;
#endif

protected:
	virtual ~CAudioOutBeOS();

	HX_RESULT   	    _Imp_Open( const HXAudioFormat* pFormat );
	HX_RESULT   	    _Imp_Close( void );
	HX_RESULT	    _Imp_Seek(ULONG32 ulSeekTime);
	HX_RESULT   	    _Imp_Pause( void );
	HX_RESULT   	    _Imp_Resume( void );
	HX_RESULT   	    _Imp_Write( const HXAudioData* pAudioOutData );
	HX_RESULT   	    _Imp_Reset( void );
	HX_RESULT  	    _Imp_Drain( void );
	BOOL 		    _Imp_SupportsVolume( void );
	UINT16   	    _Imp_GetVolume( void );
	HX_RESULT   	    _Imp_SetVolume( const UINT16 uVolume );
	HX_RESULT   	    _Imp_CheckFormat( const HXAudioFormat* pFormat);
	HX_RESULT 	    _Imp_GetCurrentTime( ULONG32& ulCurrentTime);
	INT16		    _Imp_GetAudioFd(void) {return 0;};
	UINT16		    _NumberOfBlocksRemainingToPlay(void);

private:
    void		    SetFormat(const HXAudioFormat* pFormat);
	UINT32			CalculateElapsedBytes(UINT32 ulLastBytePos, UINT32 ulCurrentBytePos);
    UINT32		    CalcMs(ULONG32 ulNumBytes);
#if _BEOS_AUDIODEV_CALLBACK
	void			DoTimeSyncs(void);
	HX_RESULT		ReschedPlaybackCheck(void);
#endif

	BPushGameSound			*m_player;
	gs_audio_format			m_gameSoundFormat;
    CHXSimpleList			*m_pPendingBufferList;
    UINT32					m_ulLastPlayCursor;
    UINT32					m_ulCurrentPlayTime;
    UINT32					m_ulLastTimeSync;
	UINT32					m_ulBufferSize;
	UINT32					m_ulFrameSize;
	UINT32					m_ulNextWriteOffset;
	UINT32					m_ulOldBytesLeft;
	UINT32					m_ulBlockSize;
	HX_BITFIELD				m_bGotAWrite : 1;
    HX_BITFIELD				m_bFirstWrite : 1;
    HX_BITFIELD				m_bPlaying : 1;
#if _BEOS_AUDIODEV_CALLBACK
	Timeval					*m_pPlaybackCountCBTime;
	BOOL					m_bCallbackPending;
	ULONG32					m_PendingCallbackID;
#endif
};


#endif 	// _AUDBEOS_H_