audlinux_oss.h

来自「symbian 下的helix player源代码」· C头文件 代码 · 共 157 行

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: audlinux_oss.h,v 1.4.18.1 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
 * 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
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 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
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 * ***** END LICENSE BLOCK ***** */

#ifndef _AUDLINUX
#define _AUDLINUX

//-----------------------------------------------
// System includes.
//-----------------------------------------------
#if defined( _LINUX ) && !defined( __powerpc__ )  && !defined __alpha && !defined __sparc__
#include "linux/soundcard.h"
#elif defined(__powerpc__)
#include "sys/soundcard.h"
#elif defined _NETBSD
#include "soundcard.h"
#elif defined _FREEBSD || defined __alpha || defined __sparc__
#include "machine/soundcard.h"
#else 
#include "machine/soundcard.h"
#endif

//------------------------------------------------
// local includes
//------------------------------------------------
#include "hxcom.h"
#include "hxslist.h"
#include "audUnix.h"

class CAudioOutLinux : public CAudioOutUNIX
{
  public:
    CAudioOutLinux();
    virtual ~CAudioOutLinux();

  protected:

    
    //-------------------------------------------------------
    //
    // Pure virtuals from CAudioOutUNIX.
    //
    //-------------------------------------------------------
    virtual INT16 _Imp_GetAudioFd(void);

    //This ones important.
    virtual UINT64 _GetBytesActualyPlayed(void) const;

    //Devic specific method to set the audio device characteristics. Sample rate,
    //bits-per-sample, etc.
    //Method *must* set member vars. m_unSampleRate and m_unNumChannels.
    virtual HX_RESULT _SetDeviceConfig( const HXAudioFormat* pFormat );

    //Device specific method to test wether or not the device supports the
    //give sample rate. If the device can not be opened, or otherwise tested,
    //it should return RA_AOE_DEVBUSY.
    virtual HX_RESULT _CheckSampleRate( ULONG32 ulSampleRate );
    virtual HX_RESULT _CheckFormat( const HXAudioFormat* pFormat );

    //Device specific method to write bytes out to the audiodevice and return a
    //count of bytes written. 
    virtual HX_RESULT _WriteBytes( UCHAR* buffer, ULONG32 ulBuffLength, LONG32& lCount );

    //Device specific methods to open/close the mixer and audio devices.
    virtual HX_RESULT _OpenAudio();
    virtual HX_RESULT _CloseAudio();
    virtual HX_RESULT _OpenMixer();
    virtual HX_RESULT _CloseMixer();

    //Device specific method to reset device and return it to a state that it 
    //can accept new sample rates, num channels, etc.
    virtual HX_RESULT _Reset();
    virtual HX_RESULT _Pause();
    virtual HX_RESULT _Resume();

    //Device specific method to get/set the devices current volume.
    virtual UINT16    _GetVolume() const;
    virtual HX_RESULT _SetVolume(UINT16 volume);

    //Device specific method to drain a device. This should play the remaining
    //bytes in the devices buffer and then return.
    virtual HX_RESULT _Drain();

    //Device specific method to return the amount of room available on the
    //audio device that can be written without blocking.
    virtual HX_RESULT _GetRoomOnDevice( ULONG32& ulBytes) const;

    //-----------------------------------------------
    // Some helper methods.
    //-----------------------------------------------
    void _SyncUpTimeStamps(ULONG32 lCount=0);
    
  private:
  
    //protect the unintentional copy ctor.
    CAudioOutLinux( const CAudioOutLinux& );  //Not implemented.

    ULONG32 m_ulLastTimeStamp;
    ULONG32 m_ulTickCount;
    UINT64  m_ulPausePosition;
    UINT64  m_ulLastBytesPlayed;

    int  m_nDevID;
    int  m_nMixerID;
    mutable BOOL m_bGetODelayFailed;
    mutable BOOL m_bGetOSpaceFailed;
    BOOL m_bTestGetODelay;
};


#endif 	//_AUDIOOUTLINUX