audlinux_esound.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

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//===================================================================================
// 
//   	audESound.h
// 
//   	CLASS: CAudioOutESound
// 	
//   	Implements the sound subsystem for the Enlightenment Sound
//      Deamon.
//
//===================================================================================

#ifndef _ADUESOUND_H_
#define _ADUESOUND_H_


//-----------------------------------------------
// System includes.
//-----------------------------------------------
#include <esd.h>

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

#include "dllacces.h"
#include "dllpath.h"

#include "audUnix.h"

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

  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();

    //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.
    //-----------------------------------------------
    virtual HX_RESULT _Pause();
    virtual HX_RESULT _Resume();

    BOOL _IsSelectable() const;
    
    BOOL _HardwarePauseSupported() const;
  private:

    esd_player_info_t* _GetPlayerInfo() const;
    
    //protect the unintentional copy ctor.
    CAudioOutESound( const CAudioOutESound& );  //Not implemented.
      
    int m_nDevID;              //the FD for the audio stream
    int m_nESoundServerID;     //the FD for the esd deamon. 
    int m_nESoundPlayerID;     //the player ID for our steam inside the server. 

    ULONG32 m_ulTickCount;
    ULONG32 m_ulPausePosition;

    CHXString m_strRealplayerName; //A place to hold a per player unique name.
    
    //ESD Library symbols needed.
    DLLAccess* m_pESDLib;
    typedef int (*ESDPlayStreamType)(esd_format_t, int, const char *, const char *);
    typedef esd_info_t* (*ESDGetAllInfoType)( int );
    typedef void (*ESDFreeAllInfoType)( esd_info_t * );
    typedef int (*ESDCloseType)( int );
    typedef int (*ESDSetStreamPanType)( int, int, int, int );
    typedef void (*ESDAudioFlushType)( void );
    typedef int (*ESDOpenSoundType)( const char * );
    
    
    ESDPlayStreamType   m_fpESDPlayStream;
    ESDGetAllInfoType   m_fpESDGetAllInfo;
    ESDFreeAllInfoType  m_fpESDFreeAllInfo;
    ESDCloseType        m_fpESDClose;
    ESDSetStreamPanType m_fpESDSetStreamPan;
    ESDAudioFlushType   m_fpESDAudioFlush;
    ESDOpenSoundType    m_fpESDOpenSound;
    

};


#endif // _ADUESOUND_H_