input.c 38.7 KB
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/*****************************************************************************
 * input.c: input thread
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 * Read an MPEG2 stream, demultiplex and parse it before sending it to
 * decoders.
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 *****************************************************************************
 * Copyright (C) 1998, 1999, 2000 VideoLAN
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 * $Id: input.c,v 1.152 2001/11/09 13:49:26 massiot Exp $
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 *
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 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
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 * 
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 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
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 *****************************************************************************/
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/*****************************************************************************
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 * Preamble
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 *****************************************************************************/
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#include "defs.h"

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#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#   include <unistd.h>
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#elif defined( _MSC_VER ) && defined( _WIN32 )
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#   include <io.h>
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#endif

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#include <string.h>
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#include <errno.h>

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#ifdef STRNCASECMP_IN_STRINGS_H
#   include <strings.h>
#endif
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#ifdef WIN32
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#   include <winsock2.h>
#elif !defined( SYS_BEOS ) && !defined( SYS_NTO )
#   include <netdb.h>                                         /* hostent ... */
#   include <sys/socket.h>
#   include <netinet/in.h>
#   include <arpa/inet.h>
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#endif
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#ifdef HAVE_SYS_TIMES_H
#   include <sys/times.h>
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#endif
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#include "config.h"
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#include "common.h"
#include "threads.h"
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#include "mtime.h"
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#include "netutils.h"
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#include "modules.h"
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#include "intf_msg.h"
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#include "intf_playlist.h"
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#include "stream_control.h"
#include "input_ext-intf.h"
#include "input_ext-dec.h"
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#include "input_ext-plugins.h"
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#include "interface.h"

#include "main.h"
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/*****************************************************************************
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 * Local prototypes
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 *****************************************************************************/
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static void RunThread       ( input_thread_t *p_input );
static  int InitThread      ( input_thread_t *p_input );
static void ErrorThread     ( input_thread_t *p_input );
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static void CloseThread     ( input_thread_t *p_input );
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static void DestroyThread   ( input_thread_t *p_input );
static void EndThread       ( input_thread_t *p_input );
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static void FileOpen        ( input_thread_t *p_input );
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static void StdOpen         ( input_thread_t *p_input );
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static void FileClose       ( input_thread_t *p_input );
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#if !defined( SYS_BEOS ) && !defined( SYS_NTO )
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static void NetworkOpen     ( input_thread_t *p_input );
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static void HTTPOpen        ( input_thread_t *p_input );
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static void NetworkClose    ( input_thread_t *p_input );
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#endif
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/*****************************************************************************
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 * input_CreateThread: creates a new input thread
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 *****************************************************************************
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 * This function creates a new input, and returns a pointer
 * to its description. On error, it returns NULL.
 * If pi_status is NULL, then the function will block until the thread is ready.
 * If not, it will be updated using one of the THREAD_* constants.
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 *****************************************************************************/
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input_thread_t *input_CreateThread ( playlist_item_t *p_item, int *pi_status )
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{
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    input_thread_t *    p_input;                        /* thread descriptor */
    int                 i_status;                           /* thread status */

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    /* Allocate descriptor */
    p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
    if( p_input == NULL )
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    {
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        intf_ErrMsg( "input error: can't allocate input thread (%s)",
                     strerror(errno) );
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        return( NULL );
    }
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    /* Packets read once */
    p_input->i_read_once = INPUT_READ_ONCE;

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    /* Initialize thread properties */
    p_input->b_die              = 0;
    p_input->b_error            = 0;
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    p_input->b_eof              = 0;

    /* Set target */
    p_input->p_source           = p_item->psz_name;

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    /* I have never understood that stuff --Meuuh */
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    p_input->pi_status          = (pi_status != NULL) ? pi_status : &i_status;
    *p_input->pi_status         = THREAD_CREATE;
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    /* Initialize stream description */
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    p_input->stream.i_es_number = 0;
    p_input->stream.i_selected_es_number = 0;
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    p_input->stream.i_pgrm_number = 0;
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    p_input->stream.i_new_status = p_input->stream.i_new_rate = 0;
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    p_input->stream.b_new_mute = MUTE_NO_CHANGE;
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    p_input->stream.i_mux_rate = 0;
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    /* no stream, no area */
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    p_input->stream.i_area_nb = 0;
    p_input->stream.pp_areas = NULL;
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    p_input->stream.p_selected_area = NULL;
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    p_input->stream.p_new_area = NULL;
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    /* By default there is one area in a stream */
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    input_AddArea( p_input );
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    p_input->stream.p_selected_area = p_input->stream.pp_areas[0];
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    /* Initialize stream control properties. */
    p_input->stream.control.i_status = PLAYING_S;
    p_input->stream.control.i_rate = DEFAULT_RATE;
    p_input->stream.control.b_mute = 0;
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    p_input->stream.control.b_grayscale = main_GetIntVariable(
                            VOUT_GRAYSCALE_VAR, VOUT_GRAYSCALE_DEFAULT );
    p_input->stream.control.i_smp = main_GetIntVariable(
                            VDEC_SMP_VAR, VDEC_SMP_DEFAULT );
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    intf_WarnMsg( 1, "input: playlist item `%s'", p_input->p_source );

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    /* Create thread. */
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    if( vlc_thread_create( &p_input->thread_id, "input", (void *) RunThread,
                           (void *) p_input ) )
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    {
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        intf_ErrMsg( "input error: can't create input thread (%s)",
                     strerror(errno) );
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        free( p_input );
        return( NULL );
    }
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    /* If status is NULL, wait until the thread is created */
    if( pi_status == NULL )
    {
        do
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        {
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            msleep( THREAD_SLEEP );
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        } while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
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                && (i_status != THREAD_FATAL) );
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        if( i_status != THREAD_READY )
        {
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            return( NULL );
        }
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    }
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    return( p_input );
}

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/*****************************************************************************
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 * input_DestroyThread: mark an input thread as zombie
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 *****************************************************************************
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 * This function should not return until the thread is effectively cancelled.
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 *****************************************************************************/
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void input_DestroyThread( input_thread_t *p_input, int *pi_status )
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{
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    int         i_status;                                   /* thread status */
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    /* Set status */
    p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
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    *p_input->pi_status = THREAD_DESTROY;

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    /* Request thread destruction */
    p_input->b_die = 1;
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    /* Make the thread exit of an eventual vlc_cond_wait() */
    vlc_mutex_lock( &p_input->stream.stream_lock );
    vlc_cond_signal( &p_input->stream.stream_wait );
    vlc_mutex_unlock( &p_input->stream.stream_lock );

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    /* If status is NULL, wait until thread has been destroyed */
    if( pi_status == NULL )
    {
        do
        {
            msleep( THREAD_SLEEP );
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        } while ( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
                  && (i_status != THREAD_FATAL) );
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    }
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}

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/*****************************************************************************
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 * RunThread: main thread loop
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 *****************************************************************************
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 * Thread in charge of processing the network packets and demultiplexing.
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 *****************************************************************************/
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static void RunThread( input_thread_t *p_input )
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{
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    int                     i_error, i;
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    data_packet_t **        pp_packets;
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    if( InitThread( p_input ) )
    {
        /* If we failed, wait before we are killed, and exit */
        *p_input->pi_status = THREAD_ERROR;
        p_input->b_error = 1;
        ErrorThread( p_input );
        DestroyThread( p_input );
        return;
    }
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    /* initialization is completed */
    vlc_mutex_lock( &p_input->stream.stream_lock );
    p_input->stream.b_changed = 1;
    vlc_mutex_unlock( &p_input->stream.stream_lock );

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    pp_packets = (data_packet_t **) malloc( p_input->i_read_once *
                                        sizeof( data_packet_t * ) );
    if( pp_packets == NULL )
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    {
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        intf_ErrMsg( "input error: out of memory" );
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        free( pp_packets );
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        p_input->b_error = 1;
    }
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    while( !p_input->b_die && !p_input->b_error && !p_input->b_eof )
    {
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        p_input->c_loops++;
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        vlc_mutex_lock( &p_input->stream.stream_lock );
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        if( p_input->stream.p_new_area )
        {
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            if( p_input->stream.b_seekable && p_input->pf_set_area != NULL )
            {

                p_input->pf_set_area( p_input, p_input->stream.p_new_area );

                for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
                {
                    pgrm_descriptor_t * p_pgrm
                                            = p_input->stream.pp_programs[i];
                    /* Escape all decoders for the stream discontinuity they
                     * will encounter. */
                    input_EscapeDiscontinuity( p_input, p_pgrm );

                    /* Reinitialize synchro. */
                    p_pgrm->i_synchro_state = SYNCHRO_REINIT;
                }
            }
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            p_input->stream.p_new_area = NULL;
        }

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        if( p_input->stream.p_selected_area->i_seek != NO_SEEK )
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        {
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            if( p_input->stream.b_seekable && p_input->pf_seek != NULL )
            {
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                p_input->pf_seek( p_input,
                                  p_input->stream.p_selected_area->i_seek );
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                for( i = 0; i < p_input->stream.i_pgrm_number; i++ )
                {
                    pgrm_descriptor_t * p_pgrm
                                            = p_input->stream.pp_programs[i];
                    /* Escape all decoders for the stream discontinuity they
                     * will encounter. */
                    input_EscapeDiscontinuity( p_input, p_pgrm );

                    /* Reinitialize synchro. */
                    p_pgrm->i_synchro_state = SYNCHRO_REINIT;
                }
            }
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            p_input->stream.p_selected_area->i_seek = NO_SEEK;
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        }
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        if( p_input->stream.p_removed_es )
        {
            input_UnselectES( p_input, p_input->stream.p_removed_es );
            p_input->stream.p_removed_es = NULL;
        }

        if( p_input->stream.p_newly_selected_es )
        {
            input_SelectES( p_input, p_input->stream.p_newly_selected_es );
            p_input->stream.p_newly_selected_es = NULL;
        }

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        if( p_input->stream.b_new_mute != MUTE_NO_CHANGE )
        {
            if( p_input->stream.b_new_mute )
            {
                input_EscapeAudioDiscontinuity( p_input );
            }

            vlc_mutex_lock( &p_input->stream.control.control_lock );
            p_input->stream.control.b_mute = p_input->stream.b_new_mute;
            vlc_mutex_unlock( &p_input->stream.control.control_lock );

            p_input->stream.b_new_mute = MUTE_NO_CHANGE;
        }

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        vlc_mutex_unlock( &p_input->stream.stream_lock );
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        i_error = p_input->pf_read( p_input, pp_packets );
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        /* Demultiplex read packets. */
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        for( i = 0; i < p_input->i_read_once && pp_packets[i] != NULL; i++ )
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        {
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            p_input->stream.c_packets_read++;
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            p_input->pf_demux( p_input, pp_packets[i] );
        }
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        if( i_error )
        {
            if( i_error == 1 )
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            {
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                /* End of file - we do not set b_die because only the
                 * interface is allowed to do so. */
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                intf_WarnMsg( 3, "input: EOF reached" );
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                p_input->b_eof = 1;
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            }
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            else
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            {
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                p_input->b_error = 1;
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            }
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        }
    }

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    free( pp_packets );

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    if( p_input->b_error || p_input->b_eof )
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    {
        ErrorThread( p_input );
    }
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    EndThread( p_input );
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    DestroyThread( p_input );

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    intf_DbgMsg("input: Thread end");
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}

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/*****************************************************************************
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 * InitThread: init the input Thread
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 *****************************************************************************/
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static int InitThread( input_thread_t * p_input )
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{

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    /* Initialize statistics */
    p_input->c_loops                    = 0;
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    p_input->stream.c_packets_read      = 0;
    p_input->stream.c_packets_trashed   = 0;
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    p_input->p_stream                   = NULL;
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    /* Set locks. */
    vlc_mutex_init( &p_input->stream.stream_lock );
    vlc_cond_init( &p_input->stream.stream_wait );
    vlc_mutex_init( &p_input->stream.control.control_lock );

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    /* Find appropriate module. */
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    p_input->p_input_module = module_Need( MODULE_CAPABILITY_INPUT,
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                                           (probedata_t *)p_input );
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    if( p_input->p_input_module == NULL )
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    {
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        intf_ErrMsg( "input error: no suitable input module for `%s'",
                     p_input->p_source );
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        return( -1 );
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    }
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#define f p_input->p_input_module->p_functions->input.functions.input
    p_input->pf_init          = f.pf_init;
    p_input->pf_end           = f.pf_end;
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    p_input->pf_init_bit_stream= f.pf_init_bit_stream;
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    p_input->pf_read          = f.pf_read;
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    p_input->pf_set_area      = f.pf_set_area;
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    p_input->pf_demux         = f.pf_demux;
    p_input->pf_new_packet    = f.pf_new_packet;
    p_input->pf_new_pes       = f.pf_new_pes;
    p_input->pf_delete_packet = f.pf_delete_packet;
    p_input->pf_delete_pes    = f.pf_delete_pes;
    p_input->pf_rewind        = f.pf_rewind;
    p_input->pf_seek          = f.pf_seek;
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#if !defined( SYS_BEOS ) && !defined( SYS_NTO )
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    /* FIXME : this is waaaay too kludgy */
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    if( ( strlen( p_input->p_source ) > 3)
          && !strncasecmp( p_input->p_source, "ts:", 3 ) )
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    {
        /* Network stream */
        NetworkOpen( p_input );
        p_input->stream.i_method = INPUT_METHOD_NETWORK;
    }
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    else if( ( strlen( p_input->p_source ) > 5 )
               && !strncasecmp( p_input->p_source, "http:", 5 ) )
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    {
        /* HTTP stream */
        HTTPOpen( p_input );
        p_input->stream.i_method = INPUT_METHOD_NETWORK;
    }
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    else 
#endif
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        if( ( strlen( p_input->p_source ) > 4 )
              && !strncasecmp( p_input->p_source, "dvd:", 4 ) )
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    {
        /* DVD - this is THE kludge */
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        f.pf_open( p_input );
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        p_input->stream.i_method = INPUT_METHOD_DVD;
    }
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    else if( ( strlen( p_input->p_source ) > 4 )
               && !strncasecmp( p_input->p_source, "vlc:", 4 ) )
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    {
        /* Dummy input - very kludgy */
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        f.pf_open( p_input );
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    }
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    else if( ( strlen( p_input->p_source ) == 1 )
               && *p_input->p_source == '-' )
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    {
        /* Stdin */
        StdOpen( p_input );
    }
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    else
    {
        /* File input */
        FileOpen( p_input );
        p_input->stream.i_method = INPUT_METHOD_FILE;
    }
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#undef f
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    if( p_input->b_error )
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    {
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        /* We barfed -- exit nicely */
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        module_Unneed( p_input->p_input_module );
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        return( -1 );
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    }
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    p_input->pf_init( p_input );
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    if( p_input->b_error )
    {
        /* We barfed -- exit nicely */
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        CloseThread( p_input );
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        module_Unneed( p_input->p_input_module );
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        return( -1 );
    }

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    *p_input->pi_status = THREAD_READY;
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    return( 0 );
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}

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/*****************************************************************************
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 * ErrorThread: RunThread() error loop
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 *****************************************************************************
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 * This function is called when an error occured during thread main's loop.
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 *****************************************************************************/
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static void ErrorThread( input_thread_t *p_input )
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{
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    while( !p_input->b_die )
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    {
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        /* Sleep a while */
        msleep( INPUT_IDLE_SLEEP );
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    }
}

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/*****************************************************************************
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 * EndThread: end the input thread
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 *****************************************************************************/
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static void EndThread( input_thread_t * p_input )
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{
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    int *       pi_status;                                  /* thread status */
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    /* Store status */
    pi_status = p_input->pi_status;
    *pi_status = THREAD_END;
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    if( p_main->b_stats )
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    {
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#ifdef HAVE_SYS_TIMES_H
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        /* Display statistics */
        struct tms  cpu_usage;
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        times( &cpu_usage );

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        intf_StatMsg( "input stats: %d loops consuming user: %d, system: %d",
                      p_input->c_loops,
                      cpu_usage.tms_utime, cpu_usage.tms_stime );
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#else
        intf_StatMsg( "input stats: %d loops", p_input->c_loops );
#endif
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        input_DumpStream( p_input );
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    }

    /* Free all ES and destroy all decoder threads */
    input_EndStream( p_input );

    /* Free demultiplexer's data */
    p_input->pf_end( p_input );

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    /* Close the input method */
    CloseThread( p_input );

    /* Release modules */
    module_Unneed( p_input->p_input_module );

}

/*****************************************************************************
 * CloseThread: close the target
 *****************************************************************************/
static void CloseThread( input_thread_t * p_input )
{
#define f p_input->p_input_module->p_functions->input.functions.input

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#if !defined( SYS_BEOS ) && !defined( SYS_NTO )
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    /* Close stream */
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    if( ( strlen( p_input->p_source ) > 3)
          && !strncasecmp( p_input->p_source, "ts:", 3 ) )
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    {
        NetworkClose( p_input );
    }
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    else if( ( strlen( p_input->p_source ) > 5 )
               && !strncasecmp( p_input->p_source, "http:", 5 ) )
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    {
        NetworkClose( p_input );
    }
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    else 
#endif
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    if( ( strlen( p_input->p_source ) > 4 )
          && !strncasecmp( p_input->p_source, "dvd:", 4 ) )
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    {
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        f.pf_close( p_input );
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    }
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    else if( ( strlen( p_input->p_source ) > 4 )
               && !strncasecmp( p_input->p_source, "vlc:", 4 ) )
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    {
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        f.pf_close( p_input );
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    }
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    else
    {
        FileClose( p_input );
    }
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#undef f
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}

/*****************************************************************************
 * DestroyThread: destroy the input thread
 *****************************************************************************/
static void DestroyThread( input_thread_t * p_input )
{
    int *       pi_status;                                  /* thread status */

    /* Store status */
    pi_status = p_input->pi_status;
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    /* Destroy Mutex locks */
    vlc_mutex_destroy( &p_input->stream.control.control_lock );
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    vlc_mutex_destroy( &p_input->stream.stream_lock );
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    /* Free input structure */
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    free( p_input );
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    /* Update status */
    *pi_status = THREAD_OVER;
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}
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/*****************************************************************************
 * StdOpen : open standard input
 *****************************************************************************/
static void StdOpen( input_thread_t * p_input )
{
    vlc_mutex_lock( &p_input->stream.stream_lock );

    /* Suppose we can control the pace - this won't work in some cases ! */
    p_input->stream.b_pace_control = 1;

    p_input->stream.b_seekable = 0;
    p_input->stream.p_selected_area->i_size = 0;
    p_input->stream.p_selected_area->i_tell = 0;
    vlc_mutex_unlock( &p_input->stream.stream_lock );

    intf_WarnMsg( 2, "input: opening stdin" );
    p_input->i_handle = 0;
}

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/*****************************************************************************
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 * FileOpen : open a file descriptor
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 *****************************************************************************/
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static void FileOpen( input_thread_t * p_input )
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{
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    struct stat         stat_info;
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    int                 i_stat;

    char *psz_name = p_input->p_source;
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    if( ( i_stat = stat( psz_name, &stat_info ) ) == (-1) )
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    {
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        int i_size = strlen( psz_name );

        if( ( i_size > 4 )
            && !strncasecmp( psz_name, "dvd:", 4 ) )
        {
            /* get rid of the 'dvd:' stuff and try again */
            psz_name += 4;
            i_stat = stat( psz_name, &stat_info );
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        }
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        else if( ( i_size > 4 )
                 && !strncasecmp( psz_name, "vcd:", 4 ) )
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        {
            /* get rid of the 'vcd:' stuff and try again */
            psz_name += 4;
            i_stat = stat( psz_name, &stat_info );
        }
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        else if( ( i_size > 5 )
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                 && !strncasecmp( psz_name, "file:", 5 ) )
        {
            /* get rid of the 'file:' stuff and try again */
            psz_name += 5;
            i_stat = stat( psz_name, &stat_info );
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        }
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        if( i_stat == (-1) )
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        {
            intf_ErrMsg( "input error: cannot stat() file `%s' (%s)",
                         psz_name, strerror(errno));
            p_input->b_error = 1;
            return;
        }
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    }

    vlc_mutex_lock( &p_input->stream.stream_lock );

    /* If we are here we can control the pace... */
    p_input->stream.b_pace_control = 1;

    if( S_ISREG(stat_info.st_mode) || S_ISCHR(stat_info.st_mode)
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         || S_ISBLK(stat_info.st_mode) )
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    {
        p_input->stream.b_seekable = 1;
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        p_input->stream.p_selected_area->i_size = stat_info.st_size;
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    }
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    else if( S_ISFIFO(stat_info.st_mode)
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#if !defined( SYS_BEOS ) && !defined( WIN32 )
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             || S_ISSOCK(stat_info.st_mode)
#endif
             )
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    {
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        p_input->stream.b_seekable = 0;
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        p_input->stream.p_selected_area->i_size = 0;
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    }
    else
    {
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        vlc_mutex_unlock( &p_input->stream.stream_lock );
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        intf_ErrMsg( "input error: unknown file type for `%s'",
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                     psz_name );
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        p_input->b_error = 1;
        return;
    }
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    p_input->stream.p_selected_area->i_tell = 0;
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    vlc_mutex_unlock( &p_input->stream.stream_lock );

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    intf_WarnMsg( 2, "input: opening file `%s'", p_input->p_source );
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    if( (p_input->i_handle = open( psz_name,
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                                   /*O_NONBLOCK | O_LARGEFILE*/0 )) == (-1) )
    {
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        intf_ErrMsg( "input error: cannot open file (%s)", strerror(errno) );
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        p_input->b_error = 1;
        return;
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    }

}
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/*****************************************************************************
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 * FileClose : close a file descriptor
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 *****************************************************************************/
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static void FileClose( input_thread_t * p_input )
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{
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    intf_WarnMsg( 2, "input: closing file `%s'", p_input->p_source );
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    close( p_input->i_handle );
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    return;
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}
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#if !defined( SYS_BEOS ) && !defined( SYS_NTO )
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/*****************************************************************************
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 * NetworkOpen : open a network socket 
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 *****************************************************************************/
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static void NetworkOpen( input_thread_t * p_input )
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{
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    char                *psz_server = NULL;
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    char                *psz_broadcast = NULL;
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    int                 i_port = 0;
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    int                 i_opt;
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    int                 i_opt_size;
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    struct sockaddr_in  sock;
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    unsigned int        i_mc_group;

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#ifdef WIN32
    WSADATA Data;
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    int i_err;
#endif
    
#ifdef WIN32
    /* WinSock Library Init. */
    i_err = WSAStartup( MAKEWORD( 1, 1 ), &Data );
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    if( i_err )
    {
        intf_ErrMsg( "input: can't initiate WinSocks, error %i", i_err );
        return ;
    }
#endif
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    /* Get the remote server */
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    if( p_input->p_source != NULL )
    {
        psz_server = p_input->p_source;

        /* Skip the protocol name */
        while( *psz_server && *psz_server != ':' )
        {
            psz_server++;
        }

        /* Skip the "://" part */
        while( *psz_server && (*psz_server == ':' || *psz_server == '/') )
        {
            psz_server++;
        }

        /* Found a server name */
        if( *psz_server )
        {
            char *psz_port = psz_server;

            /* Skip the hostname part */
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            while( *psz_port && *psz_port != ':' && *psz_port != '/' )
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            {
                psz_port++;
            }

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            /* Found a port name or a broadcast addres */
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            if( *psz_port )
            {
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                /* That's a port name */
                if( *psz_port == ':' )
                {
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                    *psz_port = '\0';
                    psz_port++;
                    i_port = atoi( psz_port );
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                }
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                /* Search for '/' just after the port in case
                 * we also have a broadcast address */
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                psz_broadcast = psz_port;
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                while( *psz_broadcast && *psz_broadcast != '/' )
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                {
                    psz_broadcast++;
                }

                if( *psz_broadcast )
                {
                    *psz_broadcast = '\0';
                    psz_broadcast++;
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                    while( *psz_broadcast && *psz_broadcast == '/' )
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                    {
                        psz_broadcast++;
                    }
                }
                else
                {
                    psz_broadcast = NULL;
                }
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            }
        }
        else
        {
            psz_server = NULL;
        }
    }

    /* Check that we got a valid server */
    if( psz_server == NULL )
    {
        psz_server = main_GetPszVariable( INPUT_SERVER_VAR, 
                                          INPUT_SERVER_DEFAULT );
    }

    /* Check that we got a valid port */
    if( i_port == 0 )
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    {
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        i_port = main_GetIntVariable( INPUT_PORT_VAR, INPUT_PORT_DEFAULT );
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    }
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    if( psz_broadcast == NULL )
    {
        /* Are we broadcasting ? */
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        if( main_GetIntVariable( INPUT_BROADCAST_VAR,
                                 INPUT_BROADCAST_DEFAULT ) )
        {
            psz_broadcast = main_GetPszVariable( INPUT_BCAST_ADDR_VAR,
                                                 INPUT_BCAST_ADDR_DEFAULT );
        }
        else
        {
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            psz_broadcast = NULL; 
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        }
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    }

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    intf_WarnMsg( 2, "input: server=%s port=%d broadcast=%s",
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                     psz_server, i_port, psz_broadcast );

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    /* Open a SOCK_DGRAM (UDP) socket, in the AF_INET domain, automatic (0)
     * protocol */
    p_input->i_handle = socket( AF_INET, SOCK_DGRAM, 0 );
    if( p_input->i_handle == -1 )
    {
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        intf_ErrMsg( "input error: can't create socket (%s)", strerror(errno) );
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        p_input->b_error = 1;
        return;
    }

    /* We may want to reuse an already used socket */
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    i_opt = 1;
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    if( setsockopt( p_input->i_handle, SOL_SOCKET, SO_REUSEADDR,
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                    (void *) &i_opt, sizeof( i_opt ) ) == -1 )
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    {
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        intf_ErrMsg( "input error: can't configure socket (SO_REUSEADDR: %s)",
                     strerror(errno));
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        close( p_input->i_handle );
        p_input->b_error = 1;
        return;
    }

    /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s) to avoid
     * packet loss caused by scheduling problems */
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    i_opt = 0x80000;
    if( setsockopt( p_input->i_handle, SOL_SOCKET, SO_RCVBUF,
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                    (void *) &i_opt, sizeof( i_opt ) ) == -1 )
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    {
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        intf_ErrMsg( "input error: can't configure socket (SO_RCVBUF: %s)", 
                     strerror(errno));
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        close( p_input->i_handle );
        p_input->b_error = 1;
        return;
    }

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    /* Check if we really got what we have asked for, because Linux, etc.
     * will silently limit the max buffer size to net.core.rmem_max which
     * is typically only 65535 bytes */
    i_opt = 0;
    i_opt_size = sizeof( i_opt );
    if( getsockopt( p_input->i_handle, SOL_SOCKET, SO_RCVBUF,
                    (void*) &i_opt, &i_opt_size ) == -1 )
    {
        intf_ErrMsg( "input error: can't configure socket (SO_RCVBUF: %s)", 
                     strerror(errno));
        close( p_input->i_handle );
        p_input->b_error = 1;
        return;
    }
    
    if( i_opt < 0x80000 )
    {
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        intf_WarnMsg( 1, "input warning: socket receive buffer size just 0x%x"
                         " instead of 0x%x bytes.", i_opt, 0x80000 );
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    }

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