audsolaris.cpp

linux下的一款播放器

    HX_RESULT retCode = RA_AOE_NOERR; 
    
    if( m_nDevID >= 0 )
    {
        ::close( m_nDevID );
        m_nDevID = NO_FILE_DESCRIPTOR;
    }
    else
    {
        retCode = RA_AOE_DEVNOTOPEN;
    }
    m_wLastError = retCode;
    return m_wLastError;
}

HX_RESULT CAudioOutSolaris::_OpenMixer()
{
    HX_RESULT retCode = RA_AOE_NOERR;

    if(!m_bMixerPresent)
    {
        //Let user override default device with environ variable.
        char *pszOverrideName = getenv( "MIXER" ); /* Flawfinder: ignore */
        char szDevCtlName[MAX_DEV_NAME]; /* Flawfinder: ignore */
        
        if (pszOverrideName && strlen(pszOverrideName)>0 )
        {
            SafeStrCpy( szDevCtlName , pszOverrideName, MAX_DEV_NAME );
        }
        else
        {
            SafeStrCpy( szDevCtlName, "/dev/audioctl", MAX_DEV_NAME);	// default for volume
        }
        
        m_nMixerID = ::open( szDevCtlName, O_RDWR );
        
        if (m_nMixerID > 0)
        {
            m_bMixerPresent = 1;
            _Imp_GetVolume();
        }
        else
        {
            m_nMixerID = NO_FILE_DESCRIPTOR;
            m_bMixerPresent = 0;
        }
    }

    m_wLastError = retCode;
    return m_wLastError;
}

HX_RESULT CAudioOutSolaris::_CloseMixer()
{
    HX_RESULT retCode = RA_AOE_NOERR;

    if( m_nMixerID >= 0 )
    {
        ::close( m_nMixerID );
        m_nMixerID = NO_FILE_DESCRIPTOR;
    }
    
    m_wLastError = retCode;
    return m_wLastError;
}

//Device specific method to reset device and return it to a state that it 
//can accept new sample rates, num channels, etc.
HX_RESULT CAudioOutSolaris::_Reset()
{
    HX_RESULT retCode = RA_AOE_NOERR;
    
    if ( m_nDevID < 0 )
    {
        retCode = RA_AOE_DEVNOTOPEN;
    }
    else if( ::ioctl(m_nDevID, I_FLUSH, FLUSHW) == -1 )
    {
        retCode = RA_AOE_GENERAL;
    }

    //Now, m_ulTotalWritten is going to go to Zero in CAudioOutUNIX.
    //So, we must reset the EOF marker.
    audio_info stAudioInfo;
    AUDIO_INITINFO( &stAudioInfo );
    
    //Fill in the structure with current settings.
    if (::ioctl(m_nDevID, AUDIO_GETINFO, &stAudioInfo) < 0) 
    {
#ifdef _DEBUG        
	fprintf( stderr, "CAudioOutSolaris: Just trying to reset EOF in _Reset.\n");
#endif        
    }

    //Just change the gain setting. Must map incoming [0,100]-->[0,255]
    stAudioInfo.play.eof     = 0;
    stAudioInfo.play.samples = 0;

    //Now store the new settings.
    if( ::ioctl(m_nMixerID, AUDIO_SETINFO, &stAudioInfo)<0 ) 
    {
#ifdef _DEBUG        
	fprintf( stderr, "CAudioOutSolaris: just trying to reset EOF\n");
#endif        
    }

    m_wLastError = retCode;
    return m_wLastError;
}

//Device specific method to get/set the devices current volume.
UINT16 CAudioOutSolaris::_GetVolume() const
{
    UINT16     unVolume = 0;
    audio_info stAudioInfo;
    
    if (::ioctl( m_nMixerID, AUDIO_GETINFO, &stAudioInfo) < 0)
    {
        //What to do here? Should we close the mixer and pretend
        //we don't have one anymore?
        unVolume = m_uCurVolume;
    }
    else
    {
        //Map device specific volume levels to [0,100]. 
        unVolume = (UINT16) (((float)(stAudioInfo.play.gain-AUDIO_MIN_GAIN))*100.0 / (float)(AUDIO_MAX_GAIN-AUDIO_MIN_GAIN) + 0.5);
        
    }

    return unVolume;
}

HX_RESULT CAudioOutSolaris::_SetVolume(UINT16 unVolume)
{
    HX_RESULT  retCode = RA_AOE_NOERR;
    audio_info stAudioInfo;

    //Fill in the structure with current settings.
    if (::ioctl(m_nMixerID, AUDIO_GETINFO, &stAudioInfo) < 0) 
    {
#ifdef _DEBUG        
	fprintf( stderr, "CAudioOutSolaris: Can't get the audio configuration\n");
#endif        
	retCode = RA_AOE_NOTSUPPORTED;
    }

    //Just change the gain setting. Must map incoming [0,100]-->[0,255]
    stAudioInfo.play.gain = (UINT16)((float)unVolume/100.0 *(float)(AUDIO_MAX_GAIN-AUDIO_MIN_GAIN) + AUDIO_MIN_GAIN + 0.5);

    //Now store the new settings.
    if( ::ioctl(m_nMixerID, AUDIO_SETINFO, &stAudioInfo)<0 ) 
    {
#ifdef _DEBUG        
	fprintf( stderr, "CAudioOutSolaris: Can't set the audio configuration.\n");
#endif        
        retCode = RA_AOE_NOTSUPPORTED;
    }
    
    m_wLastError = retCode;
    return m_wLastError;
}

//Device specific method to drain a device. This should play the remaining
//bytes in the devices buffer and then return.
HX_RESULT CAudioOutSolaris::_Drain()
{
    HX_RESULT retCode = RA_AOE_NOERR;
    
    if ( m_nDevID < 0 )
    {
        retCode = RA_AOE_DEVNOTOPEN;
    }

    //XXXgfw We don't use _Drain anywhere right now. The problem
    //XXXgfw is that drain will block the proc until the buffers
    //XXXgfw are all drained. We don't want that. Just let it
    //XXXgfw play.
//      else if( ::ioctl (m_nDevID, AUDIO_DRAIN, 0) == -1 )
//      {
//          retCode = RA_AOE_GENERAL;
//      }

    m_wLastError = retCode;
    return m_wLastError;
}


UINT64 CAudioOutSolaris::_GetBytesActualyPlayed(void) const
{
    UINT64    ulTheAnswer = 0;
    audio_info stAudioInfo;


    //Fill in the structure with current settings.
    AUDIO_INITINFO( &stAudioInfo );
    if (::ioctl(m_nDevID, AUDIO_GETINFO, &stAudioInfo) < 0) 
    {
#ifdef _DEBUG        
	fprintf( stderr, "CAudioOutSolaris::_GetBytesActualyPlayed: Failure.\n");
#endif
        HX_ASSERT( "_GetBytesActualyPlayed: Error reading audio device"==NULL );
        ulTheAnswer = 0;
    }

    if( stAudioInfo.play.error )
    {
        //Underflow has occured.
        HX_ASSERT( "_GetBytesActualyPlayed: underflow in audio device"==NULL);
    }
    
    //We *always* right full blocks to the device. Well, in the
    //case of solaris, we don't use the rewind mechinism of CAudioOutUNIX 
    //so this is true.
    ulTheAnswer = stAudioInfo.play.eof*m_wBlockSize/m_nBlockDivisions;

    //XXXgfw It would be so cool of we could count on the samples field.
//    ulTheAnswer = (ULONG32)stAudioInfo.play.samples*m_unNumChannels*m_uSampFrameSize;

//        fprintf( stderr, "m_ulTotalWritten: %lu  Bytesplayed:%lu   eof: %d  samples: %d \n",
//                 m_ulTotalWritten, ulTheAnswer, stAudioInfo.play.eof, stAudioInfo.play.samples );
    
    return  ulTheAnswer; 
}


HX_RESULT CAudioOutSolaris::_GetRoomOnDevice(ULONG32& ulBytes) const 
{
    HX_RESULT      retCode = RA_AOE_NOERR;
    
    ulBytes = m_ulDeviceBufferSize-(m_ulTotalWritten-_GetBytesActualyPlayed());
    m_wLastError = retCode;
    return m_wLastError;
}
HX_RESULT CAudioOutSolaris::_CheckFormat( const HXAudioFormat* pFormat )
{
    m_wLastError = RA_AOE_NOERR;
    return m_wLastError;
}


HX_RESULT CAudioOutSolaris::_CheckSampleRate( ULONG32 ulSampleRate ) 
{

    m_wLastError = RA_AOE_NOERR;

    //XXXgfw For now, just assume that it is supported.
    
    return m_wLastError;
}

HX_RESULT CAudioOutSolaris::_Pause() 
{
    audio_info_t stAudioInfo;
    m_wLastError = HXR_OK;

    AUDIO_INITINFO(&stAudioInfo);
    stAudioInfo.play.pause = 1;

    if( ::ioctl(m_nDevID, AUDIO_SETINFO, &stAudioInfo) < 0 )
    {
        m_wLastError = RA_AOE_NOTSUPPORTED;
    }
    return m_wLastError;
}

HX_RESULT CAudioOutSolaris::_Resume()
{
    audio_info_t stAudioInfo;
    m_wLastError = HXR_OK;

    AUDIO_INITINFO(&stAudioInfo);
    stAudioInfo.play.pause = 0;

    if( ::ioctl(m_nDevID, AUDIO_SETINFO, &stAudioInfo) < 0 ) 
    {
        m_wLastError = RA_AOE_NOTSUPPORTED;
    }
    return m_wLastError;
}

BOOL CAudioOutSolaris::_IsSelectable() const
{
    return FALSE;
}

BOOL CAudioOutSolaris::_HardwarePauseSupported() const
{
    return TRUE;
}