audlinux_esound.cpp

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 contents of this file, and the files included with this file, are 
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 * Version 1.0 (the "RPSL") available at 
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 * the file under the RealNetworks Community Source License Version 1.0 
 * (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 RealNetworks.  You may not use this file except in 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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 * ***** END LICENSE BLOCK ***** */ 

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

#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <stdio.h> 
#include <dlfcn.h>


#include "audlinux_esound.h"
#include "ihxpckts.h"
#include "hxtick.h"

//------------------------------------------
// Ctors and Dtors.
//------------------------------------------
CAudioOutESound::CAudioOutESound() :
    CAudioOutUNIX(),
    m_nDevID(NO_FILE_DESCRIPTOR),
    m_nESoundServerID(NO_FILE_DESCRIPTOR),
    m_nESoundPlayerID(NO_FILE_DESCRIPTOR),
    m_ulTickCount(0),
    m_ulPausePosition(0),
    m_strRealplayerName(""),
    m_pESDLib(NULL),
    m_fpESDPlayStream(NULL),
    m_fpESDGetAllInfo(NULL),
    m_fpESDFreeAllInfo(NULL),
    m_fpESDClose(NULL),
    m_fpESDSetStreamPan(NULL),
    m_fpESDAudioFlush(NULL),
    m_fpESDOpenSound(NULL)
{
    //Construct a proccess specific name to register with ESD.
    m_strRealplayerName.Format( "%s-%d", "realplayer", getpid() );
};

CAudioOutESound::~CAudioOutESound()
{
    HX_DELETE( m_pESDLib );
};

//-------------------------------------------------------
// These Device Specific methods must be implemented 
// by the platform specific sub-classes.
//-------------------------------------------------------
INT16 CAudioOutESound::_Imp_GetAudioFd(void)
{
    return m_nDevID;
}

//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.
HX_RESULT CAudioOutESound::_SetDeviceConfig( const HXAudioFormat* pFormat )
{
    if ( m_nESoundServerID < 0 )
        return RA_AOE_DEVNOTOPEN;

    //We can only do this once after opening the audio device.
    if( m_nDevID != NO_FILE_DESCRIPTOR )
        return RA_AOE_DEVBUSY;
    
    // Open the audio device if it isn't already open
    esd_format_t format = ESD_STREAM | ESD_PLAY;

    //Set steareo or mono
    if( 2 == pFormat->uChannels )
    {
        format |= ESD_STEREO;
    }
    else
    {
        format |= ESD_MONO;
    }
    
    //Now set the format. Either 8-bit or 16-bit audio is supported.
    if( pFormat->uBitsPerSample == 16)
    {
        format |= ESD_BITS16;
    }
    else
    {
        format |= ESD_BITS8;
    }

    //Now open our connection with ESD on the local host.
    m_nDevID = m_fpESDPlayStream( format, pFormat->ulSamplesPerSec, NULL, (const char *)m_strRealplayerName);
    
    if ( m_nDevID < 0 )
    {
#ifdef _DEBUG        
        fprintf( stderr, "Failed to open audio!!!!!!! Code is: %d  errno: %d\n",
                 m_nDevID, errno );
#endif        
        
        //Error opening device.
        return RA_AOE_DEVNOTOPEN;
    }

    m_wBlockSize         = m_ulBytesPerGran;
    m_unNumChannels      = pFormat->uChannels;
    m_unSampleRate       = pFormat->ulSamplesPerSec;
    m_ulDeviceBufferSize = ESD_BUF_SIZE*4;
    m_uSampFrameSize     = pFormat->uBitsPerSample/8;

    //Now, here is the tricky part. We must get a list of players from
    //the esd deamon and interate through them until we find our self.
    //Was we find us we need to store the ID for later use in setting
    //the volume (panning).
    //n
    // From esd.h:
    //
    //      typedef struct esd_info {
    //        
    //          esd_server_info_t *server;
    //          esd_player_info_t *player_list;
    //          esd_sample_info_t *sample_list;
    //
    //      } esd_info_t;
    //
    //  typedef struct esd_player_info {
    //      struct esd_player_info *next; /* point to next entry in list */
    //      esd_server_info_t *server;	/* the server that contains this stream */
    //      int source_id;		/* either a stream fd or sample id */
    //      char name[ ESD_NAME_MAX ];	/* name of stream for remote control */
    //      int rate;			/* sample rate */
    //      int left_vol_scale;		/* volume scaling */
    //      int right_vol_scale;
    //      esd_format_t format;	/* magic int with the format info */
    //  } esd_player_info_t;

    esd_player_info_t *pPlayerInfo = _GetPlayerInfo();
    if( NULL == pPlayerInfo )
    {
        return RA_AOE_GENERAL;
    }

    m_nESoundPlayerID = pPlayerInfo->source_id;
    HX_DELETE( pPlayerInfo );

    if( m_nESoundPlayerID == NO_FILE_DESCRIPTOR )
    {
#ifdef _DEBUG        
        fprintf( stderr, "Can't find the realaudio stream in the ESD server list.\n");
#endif
        return RA_AOE_GENERAL;
    }

#ifdef _DEBUG
    fprintf( stderr, "Device Configured:\n");
    fprintf( stderr, "        Sample Rate: %d\n", m_unSampleRate);
    fprintf( stderr, "       Sample Width: %d\n", m_uSampFrameSize);
    fprintf( stderr, "       Num channels: %d\n", m_unNumChannels);
    fprintf( stderr, "         Block size: %d\n", m_wBlockSize);
    fprintf( stderr, "  Device buffer size: %lu\n", m_ulDeviceBufferSize);
#endif

    return RA_AOE_NOERR;
}

//FREE THE RETURNED POINTER!!!!!!!!!!!!!!!
esd_player_info_t* CAudioOutESound::_GetPlayerInfo() const
{
    
    esd_info_t       *pServerInfo  = NULL;
    esd_player_info_t *pPlayerInfo = NULL;
    esd_player_info_t *pRetVal     = NULL;

    pServerInfo = m_fpESDGetAllInfo(m_nESoundServerID);
    if( pServerInfo == NULL )
    {
#ifdef _DEBUG        
        fprintf( stderr, "Can't get server info from ESD.\n");
#endif
        return NULL;
    }
    if( pServerInfo->player_list == NULL )
    {
#ifdef _DEBUG        
        fprintf( stderr, "There seem to be no players connected to esd server.\n");
#endif
        m_fpESDFreeAllInfo( pServerInfo );
        return NULL;
    }
    pPlayerInfo = pServerInfo->player_list;
    while( pPlayerInfo )
    {
        if( strcmp( pPlayerInfo->name, (const char *)m_strRealplayerName ) == 0 )
        {
            //found it.
            break;
        }
        pPlayerInfo = pPlayerInfo->next;
    }

    //We found it. Make a new one and copy.
    pRetVal = new esd_player_info_t(*pPlayerInfo);

    if( NULL == pRetVal )
    {
        //OOps.
        return NULL;
    }
    
    pRetVal->next    = NULL; //Don't even think about it.
    pRetVal->server  = NULL;
//      pRetVal->source_id = pPlayerInfo->source_id;
//      strcpy(pRetVal->name, pPlayerInfo->name );
//      pRetVal->rate = pPlayerInfo->rate;
//      pRetVal->left_vol_scale = pPlayerInfo->left_vol_scale;
//      pRetVal->right_vol_scale = pPlayerInfo->right_vol_scale
//      pRetVal->format = pPlayerInfo->format;
    
    //Free the info struct.
    m_fpESDFreeAllInfo( pServerInfo );

    return pRetVal;
}

//Device specific method to write bytes out to the audiodevice and return a
//count of bytes written. 
HX_RESULT CAudioOutESound::_WriteBytes( UCHAR* buffer, ULONG32 ulBuffLength, LONG32& lCount )
{
    
    HX_RESULT retCode = RA_AOE_NOERR;
    if( m_nDevID < 0 )
    {
        retCode = RA_AOE_DEVNOTOPEN;
    }
    else
    {
        if( m_ulTickCount == 0 )
            m_ulTickCount = GetTickCount();
        
        lCount = ::write( m_nDevID, buffer, ulBuffLength);
        
        if( lCount < 0 )
        {
            //Error occurred.
            if( errno == EAGAIN )
                retCode = RA_AOE_NOERR;
            if( errno == EINTR )
                retCode = RA_AOE_DEVBUSY;
        }