audirix.h

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

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
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 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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#ifndef _AUDIRIX
#define _AUDIRIX

//-----------------------------------------------
// System includes.
//-----------------------------------------------
#define _LANGUAGE_C_PLUS_PLUS
#include <dmedia/audio.h>

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

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

  protected:

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

    //This ones important.
    virtual ULONG32 _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 );

    //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.
    //-----------------------------------------------

  private:
  
    //protect the unintentional copy ctor.
    CAudioOutIrix( const CAudioOutIrix& );  //Not implemented.

    ALport m_pALPort;
    int    m_nDevID;
    int    m_nMixerID;
};

#endif 	//_AUDIOOUTIRIX