messages.c

video linux conference

/**
 * Add a message to a queue
 *
 * This function provides basic functionnalities to other msg_* functions.
 * It adds a message to a queue (after having printed all stored messages if it
 * is full). If the message can't be converted to string in memory, it issues
 * a warning.
 */
static void QueueMsg( vlc_object_t *p_this, int i_type, const char *psz_module,
                      const char *psz_format, va_list _args )
{
    msg_bank_t * p_bank = &p_this->p_libvlc->msg_bank;       /* message bank */
    char *       psz_str = NULL;                 /* formatted message string */
    va_list      args;
    msg_item_t * p_item = NULL;                        /* pointer to message */
    msg_item_t   item;                    /* message in case of a full queue */

#if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
    int          i_size = strlen(psz_format) + INTF_MAX_MSG_SIZE;
#endif

    /*
     * Convert message to string
     */
#if defined(HAVE_VASPRINTF) && !defined(SYS_DARWIN) && !defined( SYS_BEOS )
    vlc_va_copy( args, _args );
    vasprintf( &psz_str, psz_format, args );
    va_end( args );
#else
    psz_str = (char*) malloc( i_size * sizeof(char) );
#endif

    if( psz_str == NULL )
    {
        fprintf( stderr, "main warning: can't store message (%s): ",
                 strerror(errno) );
        vlc_va_copy( args, _args );
        vfprintf( stderr, psz_format, args );
        va_end( args );
        fprintf( stderr, "\n" );
        return;
    }

#if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
    vlc_va_copy( args, _args );
    vsnprintf( psz_str, i_size, psz_format, args );
    va_end( args );
    psz_str[ i_size - 1 ] = 0; /* Just in case */
#endif

    /* Put message in queue */
    vlc_mutex_lock( &p_bank->lock );

    /* Check there is room in the queue for our message */
    if( p_bank->b_overflow )
    {
        FlushMsg( p_bank );

        if( ((p_bank->i_stop - p_bank->i_start + 1) % VLC_MSG_QSIZE) == 0 )
        {
            /* Still in overflow mode, print from a dummy item */
            p_item = &item;
        }
        else
        {
            /* Pheeew, at last, there is room in the queue! */
            p_bank->b_overflow = VLC_FALSE;
        }
    }
    else if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
    {
        FlushMsg( p_bank );

        if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
        {
            p_bank->b_overflow = VLC_TRUE;

            /* Put the overflow message in the queue */
            p_item = p_bank->msg + p_bank->i_stop;
            p_bank->i_stop = (p_bank->i_stop + 1) % VLC_MSG_QSIZE;

            p_item->i_type =        VLC_MSG_WARN;
            p_item->i_object_id =   p_this->i_object_id;
            p_item->i_object_type = p_this->i_object_type;
            p_item->psz_module =    strdup( "message" );
            p_item->psz_msg =       strdup( "message queue overflowed" );

            PrintMsg( p_this, p_item );

            /* We print from a dummy item */
            p_item = &item;
        }
    }

    if( !p_bank->b_overflow )
    {
        /* Put the message in the queue */
        p_item = p_bank->msg + p_bank->i_stop;
        p_bank->i_stop = (p_bank->i_stop + 1) % VLC_MSG_QSIZE;
    }

    /* Fill message information fields */
    p_item->i_type =        i_type;
    p_item->i_object_id =   p_this->i_object_id;
    p_item->i_object_type = p_this->i_object_type;
    p_item->psz_module =    strdup( psz_module );
    p_item->psz_msg =       psz_str;

    PrintMsg( p_this, p_item );

    if( p_bank->b_overflow )
    {
        free( p_item->psz_module );
        free( p_item->psz_msg );
    }

    vlc_mutex_unlock( &p_bank->lock );
}

/* following functions are local */

/*****************************************************************************
 * FlushMsg
 *****************************************************************************
 * Print all messages remaining in queue. MESSAGE QUEUE MUST BE LOCKED, since
 * this function does not check the lock.
 *****************************************************************************/
static void FlushMsg ( msg_bank_t *p_bank )
{
    int i_index, i_start, i_stop;

    /* Only flush the queue if it has been properly configured */
    if( !p_bank->b_configured )
    {
        return;
    }

    /* Get the maximum message index that can be freed */
    i_stop = p_bank->i_stop;

    /* Check until which value we can free messages */
    for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
    {
        i_start = p_bank->pp_sub[ i_index ]->i_start;

        /* If this subscriber is late, we don't free messages before
         * his i_start value, otherwise he'll miss messages */
        if(   ( i_start < i_stop
               && (p_bank->i_stop <= i_start || i_stop <= p_bank->i_stop) )
           || ( i_stop < i_start
               && (i_stop <= p_bank->i_stop && p_bank->i_stop <= i_start) ) )
        {
            i_stop = i_start;
        }
    }

    /* Free message data */
    for( i_index = p_bank->i_start;
         i_index != i_stop;
         i_index = (i_index+1) % VLC_MSG_QSIZE )
    {
        free( p_bank->msg[i_index].psz_msg );
        free( p_bank->msg[i_index].psz_module );
    }

    /* Update the new start value */
    p_bank->i_start = i_index;
}

/*****************************************************************************
 * PrintMsg: output a message item to stderr
 *****************************************************************************
 * Print a message to stderr, with colour formatting if needed.
 *****************************************************************************/
static void PrintMsg ( vlc_object_t * p_this, msg_item_t * p_item )
{
#   define COL(x)  "\033[" #x ";1m"
#   define RED     COL(31)
#   define GREEN   COL(32)
#   define YELLOW  COL(33)
#   define WHITE   COL(37)
#   define GRAY    "\033[0m"

#ifdef UNDER_CE
    int i_dummy;
#endif
    static const char * ppsz_type[4] = { "", " error", " warning", " debug" };
    static const char *ppsz_color[4] = { WHITE, RED, YELLOW, GRAY };
    char *psz_object = "private";
    int i_type = p_item->i_type;

    switch( i_type )
    {
        case VLC_MSG_ERR:
            if( p_this->p_libvlc->i_verbose < 0 ) return;
            break;
        case VLC_MSG_INFO:
            if( p_this->p_libvlc->i_verbose < 0 ) return;
            break;
        case VLC_MSG_WARN:
            if( p_this->p_libvlc->i_verbose < 1 ) return;
            break;
        case VLC_MSG_DBG:
            if( p_this->p_libvlc->i_verbose < 2 ) return;
            break;
    }

    switch( p_item->i_object_type )
    {
        case VLC_OBJECT_ROOT: psz_object = "root"; break;
        case VLC_OBJECT_VLC: psz_object = "vlc"; break;
        case VLC_OBJECT_MODULE: psz_object = "module"; break;
        case VLC_OBJECT_INTF: psz_object = "interface"; break;
        case VLC_OBJECT_PLAYLIST: psz_object = "playlist"; break;
        case VLC_OBJECT_ITEM: psz_object = "item"; break;
        case VLC_OBJECT_INPUT: psz_object = "input"; break;
        case VLC_OBJECT_DECODER: psz_object = "decoder"; break;
        case VLC_OBJECT_PACKETIZER: psz_object = "packetizer"; break;
        case VLC_OBJECT_ENCODER: psz_object = "encoder"; break;
        case VLC_OBJECT_VOUT: psz_object = "video output"; break;
        case VLC_OBJECT_AOUT: psz_object = "audio output"; break;
        case VLC_OBJECT_SOUT: psz_object = "stream output"; break;
        case VLC_OBJECT_HTTPD: psz_object = "http daemon"; break;
        case VLC_OBJECT_DIALOGS: psz_object = "dialogs provider"; break;
        case VLC_OBJECT_VLM: psz_object = "vlm"; break;
        case VLC_OBJECT_ANNOUNCE: psz_object = "announce handler"; break;
        case VLC_OBJECT_DEMUX: psz_object = "demuxer"; break;
        case VLC_OBJECT_ACCESS: psz_object = "access"; break;
    }

#ifdef UNDER_CE
#   define CE_WRITE(str) WriteFile( p_this->p_libvlc->msg_bank.logfile, \
                                    str, strlen(str), &i_dummy, NULL );
    CE_WRITE( p_item->psz_module );
    CE_WRITE( " " );
    CE_WRITE( psz_object );
    CE_WRITE( ppsz_type[i_type] );
    CE_WRITE( ": " );
    CE_WRITE( p_item->psz_msg );
    CE_WRITE( "\r\n" );
    FlushFileBuffers( p_this->p_libvlc->msg_bank.logfile );

#else
    /* Send the message to stderr */
    if( p_this->p_libvlc->b_color )
    {
        fprintf( stderr, "[" GREEN "%.8i" GRAY "] %s %s%s: %s%s" GRAY "\n",
                         p_item->i_object_id, p_item->psz_module, psz_object,
                         ppsz_type[i_type], ppsz_color[i_type],
                         p_item->psz_msg );
    }
    else
    {
        fprintf( stderr, "[%.8i] %s %s%s: %s\n", p_item->i_object_id,
                         p_item->psz_module, psz_object, ppsz_type[i_type],
                         p_item->psz_msg );
    }

#   if defined(WIN32)
    fflush( stderr );
#   endif
#endif
}