audsolaris.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: audSolaris.cpp,v 1.4.8.1 2004/07/09 02:01:42 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
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 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
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 * will apply. You may also obtain the license terms directly from
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 * the rights, obligations and limitations governing use of the
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 * ***** END LICENSE BLOCK ***** */

#include "audSolaris.h"
#include "ihxpckts.h"
#include "hxstrutl.h"

#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/stropts.h> //for I_FLUSH

#include <stdio.h>


//------------------------------------------
// Ctors and Dtors.
//------------------------------------------
CAudioOutSolaris::CAudioOutSolaris() :
    CAudioOutUNIX(),
    m_nDevID(NO_FILE_DESCRIPTOR),
    m_nMixerID(NO_FILE_DESCRIPTOR),
    m_nBlockDivisions(2)
{
};

CAudioOutSolaris::~CAudioOutSolaris()
{
    //The mixer may be used without the audio device. Make sure
    //it gets closed here.
    _CloseMixer();
};

//-------------------------------------------------------
// These Device Specific methods must be implemented 
// by the platform specific sub-classes.
//-------------------------------------------------------
INT16 CAudioOutSolaris::_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 CAudioOutSolaris::_SetDeviceConfig( const HXAudioFormat* pFormat )
{
    HX_RESULT  retCode = RA_AOE_NOERR;    
    audio_info stAudioinfo;
        
    if( m_nDevID < 0 )
    {
        retCode = RA_AOE_DEVNOTOPEN;
    }
    else
    {
        AUDIO_INITINFO( &stAudioinfo );
        stAudioinfo.play.sample_rate      = pFormat->ulSamplesPerSec;
        stAudioinfo.record.sample_rate    = pFormat->ulSamplesPerSec;
        stAudioinfo.play.channels         = pFormat->uChannels;
        stAudioinfo.record.channels       = pFormat->uChannels;
        stAudioinfo.play.precision        = pFormat->uBitsPerSample;
        stAudioinfo.record.precision      = pFormat->uBitsPerSample;
        stAudioinfo.play.encoding         = AUDIO_ENCODING_LINEAR;
        stAudioinfo.record.encoding       = AUDIO_ENCODING_LINEAR;
//            stAudioinfo.play.buffer_size      = m_ulBytesPerGran;

            //Now set the new config.
        if( ::ioctl(m_nDevID, AUDIO_SETINFO, &stAudioinfo) < 0 ) 
        {
#ifdef _DEBUG                
            fprintf( stderr, "Error setting audio config\n");
#endif                
            retCode = RA_AOE_GENERAL;
        }
        else
        {
            //Set member vars from CAudioOutUNIX.
            m_wBlockSize         = m_ulBytesPerGran;
            m_unNumChannels      = pFormat->uChannels;
            m_uSampFrameSize     = pFormat->uBitsPerSample / 8;		
            m_unSampleRate       = pFormat->ulSamplesPerSec;
            //XXXgfw Is there a size? Doesn't look like it.
            //XXXgfw Lets just pick one that looks good.
            m_ulDeviceBufferSize = 1<<16;
        }

            
        AUDIO_INITINFO(&stAudioinfo);
        if( ::ioctl(m_nDevID, AUDIO_GETINFO, &stAudioinfo) < 0 ) 
        {
#ifdef _DEBUG            
            fprintf( stderr, "CAudioOutSolaris: Can't get audio configuration.\n");
#endif            
            retCode = RA_AOE_GENERAL;
        }
        else
        {
            HX_ASSERT( stAudioinfo.play.sample_rate == m_unSampleRate ); 
            HX_ASSERT( stAudioinfo.play.channels    == m_unNumChannels );
            HX_ASSERT( stAudioinfo.play.precision   == m_uSampFrameSize*8 );
            HX_ASSERT( stAudioinfo.play.encoding    == AUDIO_ENCODING_LINEAR );
//                HX_ASSERT( stAudioinfo.play.buffer_size == m_ulBytesPerGran );
        }
    }

    //XXXgfw 
//      fprintf( stderr, "channels: %d   FrameSize: %d   SampleRate: %d   BuffSize: %d BlockSize: %d\n",
//               m_unNumChannels, m_uSampFrameSize, m_unSampleRate, m_ulDeviceBufferSize, m_wBlockSize);


    m_wLastError = retCode;
    return m_wLastError;
}


ULONG32 CAudioOutSolaris::_WriteWithEOF(UCHAR* buffer, ULONG32 ulBuffLength )
{
    HX_ASSERT( ulBuffLength != 0 );
    
    ULONG32 lCount = ::write( m_nDevID, buffer, ulBuffLength);
    if( lCount > 0 )
    {
        //We wrote at least one byte. Write an EOF marker.
        char  szEOF[1]; /* Flawfinder: ignore */
        if( ::write( m_nDevID, szEOF, 0) < 0 )
        {
            //Some sort of error. This is going to throw off our
            //ability to report the number of bytes played. We could
            //keep track of how many times this happens and then just
            //force a restart of the playback or something.
            HX_ASSERT( "_WriteWithEOF: Failed to write EOF" == NULL );
        }
    }
    else
    {
        HX_ASSERT( "_WriteWithEOF: Can't write to device." == NULL );
    }
    return lCount;
}


//Device specific method to write bytes out to the audiodevice and return a 
//count of bytes written. 
HX_RESULT CAudioOutSolaris::_WriteBytes( UCHAR* buffer, ULONG32 ulBuffLength, LONG32& lCount )
{
    HX_ASSERT( ulBuffLength==m_wBlockSize);
    
    HX_RESULT retCode = RA_AOE_NOERR;

    if( m_nDevID < 0 )
    {
        retCode = RA_AOE_DEVNOTOPEN;
    }
    else if( ulBuffLength > 0 ) //Ignore all zero length writes. They screw up eof count.
    {
        //Try to increase resolution by splitting the write. ulBuffLength is 
        //always even.
        HX_ASSERT( (m_wBlockSize%m_nBlockDivisions) == 0 );
        
        int i=0;
        int nChunkSize = m_wBlockSize/m_nBlockDivisions;
        
        for( i=0 ; i< m_nBlockDivisions ; i++ )
        {
            lCount = _WriteWithEOF( buffer+i*nChunkSize, nChunkSize );
            if( lCount < 0 )
                break;
        }
        
        if( lCount < 0 )
        {
            //Error occurred.
            if( errno == EAGAIN )
                retCode = RA_AOE_NOERR;
            if( errno == EINTR )
                retCode = RA_AOE_DEVBUSY;
        }
        else 
        {
            lCount = m_wBlockSize/m_nBlockDivisions*i;
        }
    }
    
    
    return retCode;
}

//Device specific methods to open/close the mixer and audio devices.
HX_RESULT CAudioOutSolaris::_OpenAudio()
{
    HX_RESULT retCode = RA_AOE_NOERR;

    //Check the environmental variable to let user overide default device.
    char *pszOverrideName = getenv( "AUDIO" ); /* Flawfinder: ignore */
    char szDevName[MAX_DEV_NAME+1]; /* Flawfinder: ignore */
    
    // Use defaults if no environment variable is set.
    if ( pszOverrideName && strlen(pszOverrideName)>0 )
    {
        SafeStrCpy( szDevName, pszOverrideName, MAX_DEV_NAME );
    }
    else
    {
        pszOverrideName = getenv( "AUDIODEV" ); /* Flawfinder: ignore */
        if ( pszOverrideName && strlen(pszOverrideName)>0 )
        {
            SafeStrCpy( szDevName, pszOverrideName, MAX_DEV_NAME );
        }
        else
        {
            SafeStrCpy( szDevName, "/dev/audio", MAX_DEV_NAME);
        }
    }
    szDevName[MAX_DEV_NAME]='\0';
    
    // Open the audio device if it isn't already open
    if ( m_nDevID < 0 )
    {
        //We open in non block mode first, just to test wether or not
        //someone has the audio device. After that we must reopen it
        //so that our writes always block.
        m_nDevID = ::open( szDevName, O_WRONLY | O_EXCL | O_NONBLOCK );
        if( m_nDevID >= 0 )
        {
            //XXXgfw Yeah, I know, why don't I just use ioctl(....,FIONBIO, ...);
            //or fcntl? because it doesn't work!
            close(m_nDevID);
            m_nDevID = ::open( szDevName, O_WRONLY | O_EXCL);
        }
        
    }
    
    if ( m_nDevID < 0 )
    {
        //Error opening device.
        retCode = RA_AOE_BADOPEN;
    }

    m_wLastError = retCode;
    return m_wLastError;
}

HX_RESULT CAudioOutSolaris::_CloseAudio()
{