input.c 94.1 KB
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/*****************************************************************************
 * input.c: input thread
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 *****************************************************************************
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 * Copyright (C) 1998-2007 the VideoLAN team
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 * $Id$
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 *
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 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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 *          Laurent Aimar <fenrir@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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/
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/*****************************************************************************
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 * Preamble
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 *****************************************************************************/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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#include <vlc_common.h>
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#include <ctype.h>
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#include <limits.h>
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#include <assert.h>
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#include "input_internal.h"
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#include <vlc_sout.h>
#include "../stream_output/stream_output.h"
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#include <vlc_interface.h>
#include <vlc_url.h>
#include <vlc_charset.h>
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#ifdef HAVE_SYS_STAT_H
#   include <sys/stat.h>
#endif

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/*****************************************************************************
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 * Local prototypes
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 *****************************************************************************/
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static void Destructor( input_thread_t * p_input );

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static  int Run  ( input_thread_t *p_input );
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static  int RunAndDestroy  ( input_thread_t *p_input );
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static input_thread_t * Create  ( vlc_object_t *, input_item_t *,
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                                  const char *, bool, sout_instance_t * );
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static  int             Init    ( input_thread_t *p_input );
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static void             WaitDie   ( input_thread_t *p_input );
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static void             End     ( input_thread_t *p_input );
static void             MainLoop( input_thread_t *p_input );
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static inline int ControlPopNoLock( input_thread_t *, int *, vlc_value_t * );
static void       ControlReduce( input_thread_t * );
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static bool Control( input_thread_t *, int, vlc_value_t );
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static int  UpdateFromAccess( input_thread_t * );
static int  UpdateFromDemux( input_thread_t * );
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static void UpdateItemLength( input_thread_t *, int64_t i_length );
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static void MRLSections( input_thread_t *, char *, int *, int *, int *, int *);
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static input_source_t *InputSourceNew( input_thread_t *);
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static int  InputSourceInit( input_thread_t *, input_source_t *,
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                             const char *, const char *psz_forced_demux );
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static void InputSourceClean( input_source_t * );
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/* TODO */
//static void InputGetAttachments( input_thread_t *, input_source_t * );
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static void SlaveDemux( input_thread_t *p_input );
static void SlaveSeek( input_thread_t *p_input );
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static void InputMetaUser( input_thread_t *p_input, vlc_meta_t *p_meta );
static void InputUpdateMeta( input_thread_t *p_input, vlc_meta_t *p_meta );
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static void DemuxMeta( input_thread_t *p_input, vlc_meta_t *p_meta, demux_t *p_demux );
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static void AccessMeta( input_thread_t * p_input, vlc_meta_t *p_meta );
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static void AppendAttachment( int *pi_attachment, input_attachment_t ***ppp_attachment,
                              int i_new, input_attachment_t **pp_new );

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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.
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 *
 * Variables for _public_ use:
 * * Get and Set:
 *  - state
 *  - rate,rate-slower, rate-faster
 *  - position, position-offset
 *  - time, time-offset
 *  - title,title-next,title-prev
 *  - chapter,chapter-next, chapter-prev
 *  - program, audio-es, video-es, spu-es
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 *  - audio-delay, spu-delay
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 *  - bookmark
 * * Get only:
 *  - length
 *  - bookmarks
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 *  - seekable (if you can seek, it doesn't say if 'bar display' has be shown
 *    or not, for that check position != 0.0)
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 *  - can-pause
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 *  - teletext-es to get the index of spu track that is teletext --1 if no teletext)
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 * * For intf callback upon changes
 *  - intf-change
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 *  - rate-change for when playback rate changes
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 * TODO explain when Callback is called
 * TODO complete this list (?)
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 *****************************************************************************/
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static input_thread_t *Create( vlc_object_t *p_parent, input_item_t *p_item,
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                               const char *psz_header, bool b_quick,
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                               sout_instance_t *p_sout )
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{
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    static const char input_name[] = "input";
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    input_thread_t *p_input = NULL;                 /* thread descriptor */
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    vlc_value_t val;
    int i;
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    /* Allocate descriptor */
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    p_input = vlc_custom_create( p_parent, sizeof( *p_input ),
                                 VLC_OBJECT_INPUT, input_name );
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    if( p_input == NULL )
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        return NULL;
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    /* Construct a nice name for the input timer */
    char psz_timer_name[255];
    char * psz_name = input_item_GetName( p_item );
    snprintf( psz_timer_name, sizeof(psz_timer_name),
              "input launching for '%s'", psz_name );
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    msg_Dbg( p_input, "Creating an input for '%s'", psz_name);

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    free( psz_name );

    /* Start a timer to mesure how long it takes
     * to launch an input */
    stats_TimerStart( p_input, psz_timer_name,
        STATS_TIMER_INPUT_LAUNCHING );

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    MALLOC_NULL( p_input->p, input_thread_private_t );
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    memset( p_input->p, 0, sizeof( input_thread_private_t ) );
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    /* One "randomly" selected input thread is responsible for computing
     * the global stats. Check if there is already someone doing this */
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    if( p_input->p_libvlc->p_stats && !b_quick )
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    {
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        libvlc_priv_t *priv = libvlc_priv (p_input->p_libvlc);
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        vlc_mutex_lock( &p_input->p_libvlc->p_stats->lock );
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        if( priv->p_stats_computer == NULL )
            priv->p_stats_computer = p_input;
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        vlc_mutex_unlock( &p_input->p_libvlc->p_stats->lock );
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    }

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    p_input->b_preparsing = b_quick;
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    p_input->psz_header = psz_header ? strdup( psz_header ) : NULL;
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    /* Init events */
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    vlc_event_manager_t * p_em = &p_input->p->event_manager;
    vlc_event_manager_init_with_vlc_object( p_em, p_input );
    vlc_event_manager_register_event_type( p_em, vlc_InputStateChanged );
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    vlc_event_manager_register_event_type( p_em, vlc_InputSelectedStreamChanged );
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    /* Init Common fields */
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    p_input->b_eof = false;
    p_input->b_can_pace_control = true;
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    p_input->p->i_start = 0;
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    p_input->i_time  = 0;
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    p_input->p->i_stop  = 0;
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    p_input->p->i_run  = 0;
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    p_input->p->i_title = 0;
    p_input->p->title   = NULL;
    p_input->p->i_title_offset = p_input->p->i_seekpoint_offset = 0;
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    p_input->i_state = INIT_S;
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    p_input->p->i_rate  = INPUT_RATE_DEFAULT;
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    TAB_INIT( p_input->p->i_bookmark, p_input->p->bookmark );
    TAB_INIT( p_input->p->i_attachment, p_input->p->attachment );
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    p_input->p->p_es_out = NULL;
    p_input->p->p_sout  = NULL;
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    p_input->p->b_out_pace_control = false;
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    p_input->i_pts_delay = 0;

    /* Init Input fields */
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    vlc_gc_incref( p_item ); /* Released in Destructor() */
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    p_input->p->input.p_item = p_item;
    p_input->p->input.p_access = NULL;
    p_input->p->input.p_stream = NULL;
    p_input->p->input.p_demux  = NULL;
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    p_input->p->input.b_title_demux = false;
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    p_input->p->input.i_title  = 0;
    p_input->p->input.title    = NULL;
    p_input->p->input.i_title_offset = p_input->p->input.i_seekpoint_offset = 0;
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    p_input->p->input.b_can_pace_control = true;
    p_input->p->input.b_can_rate_control = true;
    p_input->p->input.b_rescale_ts = true;
    p_input->p->input.b_eof = false;
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    p_input->p->input.i_cr_average = 0;

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    vlc_mutex_lock( &p_item->lock );
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    if( !p_item->p_stats )
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        p_item->p_stats = stats_NewInputStats( p_input );
    vlc_mutex_unlock( &p_item->lock );
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    /* No slave */
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    p_input->p->i_slave = 0;
    p_input->p->slave   = NULL;
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    /* Init control buffer */
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    vlc_mutex_init( &p_input->p->lock_control );
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    p_input->p->i_control = 0;
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    /* Parse input options */
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    vlc_mutex_lock( &p_item->lock );
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    assert( p_item->optflagc == p_item->i_options );
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    for( i = 0; i < p_item->i_options; i++ )
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        var_OptionParse( VLC_OBJECT(p_input), p_item->ppsz_options[i],
                         !!(p_item->optflagv[i] & VLC_INPUT_OPTION_TRUSTED) );
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    vlc_mutex_unlock( &p_item->lock );
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    /* Create Object Variables for private use only */
    input_ConfigVarInit( p_input );
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    /* Create Objects variables for public Get and Set */
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    input_ControlVarInit( p_input );
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    p_input->p->input.i_cr_average = var_GetInteger( p_input, "cr-average" );
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    if( !p_input->b_preparsing )
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    {
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        var_Get( p_input, "bookmarks", &val );
        if( val.psz_string )
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        {
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            /* FIXME: have a common cfg parsing routine used by sout and others */
            char *psz_parser, *psz_start, *psz_end;
            psz_parser = val.psz_string;
            while( (psz_start = strchr( psz_parser, '{' ) ) )
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            {
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                 seekpoint_t *p_seekpoint = vlc_seekpoint_New();
                 char backup;
                 psz_start++;
                 psz_end = strchr( psz_start, '}' );
                 if( !psz_end ) break;
                 psz_parser = psz_end + 1;
                 backup = *psz_parser;
                 *psz_parser = 0;
                 *psz_end = ',';
                 while( (psz_end = strchr( psz_start, ',' ) ) )
                 {
                     *psz_end = 0;
                     if( !strncmp( psz_start, "name=", 5 ) )
                     {
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                         p_seekpoint->psz_name = strdup(psz_start + 5);
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                     }
                     else if( !strncmp( psz_start, "bytes=", 6 ) )
                     {
                         p_seekpoint->i_byte_offset = atoll(psz_start + 6);
                     }
                     else if( !strncmp( psz_start, "time=", 5 ) )
                     {
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                         p_seekpoint->i_time_offset = atoll(psz_start + 5) *
                                                        1000000;
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                     }
                     psz_start = psz_end + 1;
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                }
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                msg_Dbg( p_input, "adding bookmark: %s, bytes=%"PRId64", time=%"PRId64,
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                                  p_seekpoint->psz_name, p_seekpoint->i_byte_offset,
                                  p_seekpoint->i_time_offset );
                input_Control( p_input, INPUT_ADD_BOOKMARK, p_seekpoint );
                vlc_seekpoint_Delete( p_seekpoint );
                *psz_parser = backup;
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            }
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            free( val.psz_string );
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        }
    }

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    /* Remove 'Now playing' info as it is probably outdated */
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    input_item_SetNowPlaying( p_item, NULL );
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    /* */
    if( p_input->b_preparsing )
        p_input->i_flags |= OBJECT_FLAGS_QUIET | OBJECT_FLAGS_NOINTERACT;

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    /* */
    if( p_sout )
        p_input->p->p_sout = p_sout;

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    memset( &p_input->p->counters, 0, sizeof( p_input->p->counters ) );
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    vlc_mutex_init( &p_input->p->counters.counters_lock );
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    /* Set the destructor when we are sure we are initialized */
    vlc_object_set_destructor( p_input, (vlc_destructor_t)Destructor );

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    /* Attach only once we are ready */
    vlc_object_attach( p_input, p_parent );

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    return p_input;
}

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/**
 * Input destructor (called when the object's refcount reaches 0).
 */
static void Destructor( input_thread_t * p_input )
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{
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    input_thread_private_t *priv = p_input->p;
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#ifndef NDEBUG
    char * psz_name = input_item_GetName( p_input->p->input.p_item );
    msg_Dbg( p_input, "Destroying the input for '%s'", psz_name);
    free( psz_name );
#endif

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    vlc_event_manager_fini( &p_input->p->event_manager );

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    stats_TimerDump( p_input, STATS_TIMER_INPUT_LAUNCHING );
    stats_TimerClean( p_input, STATS_TIMER_INPUT_LAUNCHING );
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#ifdef ENABLE_SOUT
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    if( priv->p_sout )
        sout_DeleteInstance( priv->p_sout );
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#endif
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    vlc_gc_decref( p_input->p->input.p_item );

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    vlc_mutex_destroy( &p_input->p->counters.counters_lock );

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    vlc_mutex_destroy( &priv->lock_control );
    free( priv );
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}
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/**
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 * Initialize an input thread and run it. You will need to monitor the
 * thread to clean up after it is done
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 *
 * \param p_parent a vlc_object
 * \param p_item an input item
 * \return a pointer to the spawned input thread
 */
input_thread_t *__input_CreateThread( vlc_object_t *p_parent,
                                      input_item_t *p_item )
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{
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    return __input_CreateThreadExtended( p_parent, p_item, NULL, NULL );
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}

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/* */
input_thread_t *__input_CreateThreadExtended( vlc_object_t *p_parent,
                                              input_item_t *p_item,
                                              const char *psz_log, sout_instance_t *p_sout )
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{
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    input_thread_t *p_input;
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    p_input = Create( p_parent, p_item, psz_log, false, p_sout );
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    if( !p_input )
        return NULL;

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    /* Create thread and wait for its readiness. */
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    if( vlc_thread_create( p_input, "input", Run,
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                           VLC_THREAD_PRIORITY_INPUT, true ) )
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    {
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        input_ChangeState( p_input, ERROR_S );
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        msg_Err( p_input, "cannot create input thread" );
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        vlc_object_detach( p_input );
        vlc_object_release( p_input );
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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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/**
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 * Initialize an input thread and run it. This thread will clean after itself,
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 * you can forget about it. It can work either in blocking or non-blocking mode
 *
 * \param p_parent a vlc_object
 * \param p_item an input item
 * \param b_block should we block until read is finished ?
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 * \return the input object id if non blocking, an error code else
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 */
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int __input_Read( vlc_object_t *p_parent, input_item_t *p_item,
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                   bool b_block )
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{
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    input_thread_t *p_input;
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    p_input = Create( p_parent, p_item, NULL, false, NULL );
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    if( !p_input )
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        return VLC_EGENERIC;

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    if( b_block )
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    {
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        RunAndDestroy( p_input );
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        return VLC_SUCCESS;
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    }
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    else
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    {
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        if( vlc_thread_create( p_input, "input", RunAndDestroy,
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                               VLC_THREAD_PRIORITY_INPUT, true ) )
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        {
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            input_ChangeState( p_input, ERROR_S );
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            msg_Err( p_input, "cannot create input thread" );
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            vlc_object_release( p_input );
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            return VLC_EGENERIC;
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        }
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    }
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    return p_input->i_object_id;
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}
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/**
 * Initialize an input and initialize it to preparse the item
 * This function is blocking. It will only accept to parse files
 *
 * \param p_parent a vlc_object_t
 * \param p_item an input item
 * \return VLC_SUCCESS or an error
 */
int __input_Preparse( vlc_object_t *p_parent, input_item_t *p_item )
{
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    input_thread_t *p_input;
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    /* Allocate descriptor */
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    p_input = Create( p_parent, p_item, NULL, true, NULL );
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    if( !p_input )
        return VLC_EGENERIC;

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    if( !Init( p_input ) )
        End( p_input );
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    vlc_object_detach( p_input );
    vlc_object_release( p_input );
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    return VLC_SUCCESS;
}

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/**
 * Request a running input thread to stop and die
 *
 * \param the input thread to stop
 */
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static void ObjectKillChildrens( input_thread_t *p_input, vlc_object_t *p_obj )
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{
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    vlc_list_t *p_list;
    int i;
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    if( p_obj->i_object_type == VLC_OBJECT_VOUT ||
        p_obj->i_object_type == VLC_OBJECT_AOUT ||
        p_obj == VLC_OBJECT(p_input->p->p_sout) )
        return;

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    vlc_object_kill( p_obj );
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    p_list = vlc_list_children( p_obj );
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    for( i = 0; i < p_list->i_count; i++ )
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        ObjectKillChildrens( p_input, p_list->p_values[i].p_object );
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    vlc_list_release( p_list );
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}
void input_StopThread( input_thread_t *p_input )
{
    /* Set die for input and ALL of this childrens (even (grand-)grand-childrens)
     * It is needed here even if it is done in INPUT_CONTROL_SET_DIE handler to
     * unlock the control loop */
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    ObjectKillChildrens( p_input, VLC_OBJECT(p_input) );
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    input_ControlPush( p_input, INPUT_CONTROL_SET_DIE, NULL );
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}

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sout_instance_t * input_DetachSout( input_thread_t *p_input )
{
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    sout_instance_t *p_sout = p_input->p->p_sout;
    vlc_object_detach( p_sout );
    p_input->p->p_sout = NULL;
    return p_sout;
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}

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/*****************************************************************************
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 * Run: main thread loop
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 * This is the "normal" thread that spawns the input processing chain,
 * reads the stream, cleans up and waits
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 *****************************************************************************/
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static int Run( input_thread_t *p_input )
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{
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    /* Signal that the thread is launched */
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    vlc_thread_ready( p_input );

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    if( Init( p_input ) )
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    {
        /* If we failed, wait before we are killed, and exit */
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        p_input->b_error = true;
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        WaitDie( p_input );
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        /* Tell we're dead */
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        p_input->b_dead = true;
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        return 0;
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    }
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    MainLoop( p_input );

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    if( !p_input->b_eof && !p_input->b_error && p_input->p->input.b_eof )
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    {
        /* We have finish to demux data but not to play them */
        while( !p_input->b_die )
        {
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            if( input_EsOutDecodersEmpty( p_input->p->p_es_out ) )
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                break;

            msg_Dbg( p_input, "waiting decoder fifos to empty" );

            msleep( INPUT_IDLE_SLEEP );
        }

        /* We have finished */
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        p_input->b_eof = true;
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        input_ChangeState( p_input, END_S );
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    }

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    /* Wait until we are asked to die */
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    if( !p_input->b_die )
    {
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        WaitDie( p_input );
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    }

    /* Clean up */
    End( p_input );

    return 0;
}

/*****************************************************************************
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 * RunAndDestroy: main thread loop
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 * This is the "just forget me" thread that spawns the input processing chain,
 * reads the stream, cleans up and releases memory
 *****************************************************************************/
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static int RunAndDestroy( input_thread_t *p_input )
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{
    /* Signal that the thread is launched */
    vlc_thread_ready( p_input );

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    if( Init( p_input ) )
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        goto exit;
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    MainLoop( p_input );

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    if( !p_input->b_eof && !p_input->b_error && p_input->p->input.b_eof )
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    {
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        /* We have finished demuxing data but not playing it */
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        while( !p_input->b_die )
        {
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            if( input_EsOutDecodersEmpty( p_input->p->p_es_out ) )
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                break;

            msg_Dbg( p_input, "waiting decoder fifos to empty" );

            msleep( INPUT_IDLE_SLEEP );
        }
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        /* We have finished */
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        p_input->b_eof = true;
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    }

    /* Clean up */
    End( p_input );

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exit:
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    /* Release memory */
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    vlc_object_release( p_input );
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    return 0;
}

/*****************************************************************************
 * Main loop: Fill buffers from access, and demux
 *****************************************************************************/
static void MainLoop( input_thread_t *p_input )
{
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    int64_t i_start_mdate = mdate();
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    int64_t i_intf_update = 0;
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    int i_updates = 0;
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    /* Stop the timer */
    stats_TimerStop( p_input, STATS_TIMER_INPUT_LAUNCHING );

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    while( !p_input->b_die && !p_input->b_error && !p_input->p->input.b_eof )
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    {
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        bool b_force_update = false;
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        int i_ret;
        int i_type;
        vlc_value_t val;
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        /* Do the read */
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        if( p_input->i_state != PAUSE_S )
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        {
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            if( ( p_input->p->i_stop > 0 && p_input->i_time >= p_input->p->i_stop ) ||
                ( p_input->p->i_run > 0 && i_start_mdate+p_input->p->i_run < mdate() ) )
                i_ret = 0; /* EOF */
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            else
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                i_ret = p_input->p->input.p_demux->pf_demux(p_input->p->input.p_demux);
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            if( i_ret > 0 )
            {
                /* TODO */
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                if( p_input->p->input.b_title_demux &&
                    p_input->p->input.p_demux->info.i_update )
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                {
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                    i_ret = UpdateFromDemux( p_input );
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                    b_force_update = true;
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                }
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                else if( !p_input->p->input.b_title_demux &&
                          p_input->p->input.p_access &&
                          p_input->p->input.p_access->info.i_update )
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                {
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                    i_ret = UpdateFromAccess( p_input );
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                    b_force_update = true;
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                }
            }
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            if( i_ret == 0 )    /* EOF */
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            {
                vlc_value_t repeat;
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                var_Get( p_input, "input-repeat", &repeat );
                if( repeat.i_int == 0 )
                {
                    /* End of file - we do not set b_die because only the
                     * playlist is allowed to do so. */
                    msg_Dbg( p_input, "EOF reached" );
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                    p_input->p->input.b_eof = true;
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                }
                else
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                {
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                    msg_Dbg( p_input, "repeating the same input (%d)",
                             repeat.i_int );
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                    if( repeat.i_int > 0 )
                    {
                        repeat.i_int--;
                        var_Set( p_input, "input-repeat", repeat );
                    }
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                    /* Seek to start title/seekpoint */
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                    val.i_int = p_input->p->input.i_title_start -
                        p_input->p->input.i_title_offset;
                    if( val.i_int < 0 || val.i_int >= p_input->p->input.i_title )
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                        val.i_int = 0;
                    input_ControlPush( p_input,
                                       INPUT_CONTROL_SET_TITLE, &val );

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                    val.i_int = p_input->p->input.i_seekpoint_start -
                        p_input->p->input.i_seekpoint_offset;
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                    if( val.i_int > 0 /* TODO: check upper boundary */ )
                        input_ControlPush( p_input,
                                           INPUT_CONTROL_SET_SEEKPOINT, &val );

                    /* Seek to start position */
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                    if( p_input->p->i_start > 0 )
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                    {
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                        val.i_time = p_input->p->i_start;
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                        input_ControlPush( p_input, INPUT_CONTROL_SET_TIME,
                                           &val );
                    }
                    else
                    {
                        val.f_float = 0.0;
                        input_ControlPush( p_input, INPUT_CONTROL_SET_POSITION,
                                           &val );
                    }
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                    /* */
                    i_start_mdate = mdate();
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                }
            }
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            else if( i_ret < 0 )
            {
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                p_input->b_error = true;
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            }
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            if( i_ret > 0 && p_input->p->i_slave > 0 )
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            {
                SlaveDemux( p_input );
            }
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        }
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        else
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        {
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            /* Small wait */
            msleep( 10*1000 );
        }
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        /* Handle control */
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        vlc_mutex_lock( &p_input->p->lock_control );
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        ControlReduce( p_input );
        while( !ControlPopNoLock( p_input, &i_type, &val ) )
        {
            msg_Dbg( p_input, "control type=%d", i_type );
            if( Control( p_input, i_type, val ) )
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                b_force_update = true;
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        }
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        vlc_mutex_unlock( &p_input->p->lock_control );
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        if( b_force_update || i_intf_update < mdate() )
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        {
            vlc_value_t val;
            double f_pos;
            int64_t i_time, i_length;
            /* update input status variables */
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            if( !demux_Control( p_input->p->input.p_demux,
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                                 DEMUX_GET_POSITION, &f_pos ) )
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            {
                val.f_float = (float)f_pos;
                var_Change( p_input, "position", VLC_VAR_SETVALUE, &val, NULL );
            }
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            if( !demux_Control( p_input->p->input.p_demux,
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                                 DEMUX_GET_TIME, &i_time ) )
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            {
                p_input->i_time = i_time;
                val.i_time = i_time;
                var_Change( p_input, "time", VLC_VAR_SETVALUE, &val, NULL );
            }
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            if( !demux_Control( p_input->p->input.p_demux,
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                                 DEMUX_GET_LENGTH, &i_length ) )
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            {
                vlc_value_t old_val;
                var_Get( p_input, "length", &old_val );
                val.i_time = i_length;
                var_Change( p_input, "length", VLC_VAR_SETVALUE, &val, NULL );
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                if( old_val.i_time != val.i_time )
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                {
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                    UpdateItemLength( p_input, i_length );
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                }
            }
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            var_SetBool( p_input, "intf-change", true );
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            i_intf_update = mdate() + INT64_C(150000);
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        }
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        /* 150ms * 8 = ~ 1 second */
        if( ++i_updates % 8 == 0 )
        {
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            stats_ComputeInputStats( p_input, p_input->p->input.p_item->p_stats );
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            /* Are we the thread responsible for computing global stats ? */
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            if( libvlc_priv (p_input->p_libvlc)->p_stats_computer == p_input )
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            {
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                stats_ComputeGlobalStats( p_input->p_libvlc,
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                                          p_input->p_libvlc->p_stats );
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            }
        }
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    }
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}

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static void InitStatistics( input_thread_t * p_input )
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{
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    if( p_input->b_preparsing ) return;
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    /* Prepare statistics */
#define INIT_COUNTER( c, type, compute ) p_input->p->counters.p_##c = \
 stats_CounterCreate( p_input, VLC_VAR_##type, STATS_##compute);
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    if( libvlc_stats (p_input) )
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    {
        INIT_COUNTER( read_bytes, INTEGER, COUNTER );
        INIT_COUNTER( read_packets, INTEGER, COUNTER );
        INIT_COUNTER( demux_read, INTEGER, COUNTER );
        INIT_COUNTER( input_bitrate, FLOAT, DERIVATIVE );
        INIT_COUNTER( demux_bitrate, FLOAT, DERIVATIVE );
        INIT_COUNTER( played_abuffers, INTEGER, COUNTER );
        INIT_COUNTER( lost_abuffers, INTEGER, COUNTER );
        INIT_COUNTER( displayed_pictures, INTEGER, COUNTER );
        INIT_COUNTER( lost_pictures, INTEGER, COUNTER );
        INIT_COUNTER( decoded_audio, INTEGER, COUNTER );
        INIT_COUNTER( decoded_video, INTEGER, COUNTER );
        INIT_COUNTER( decoded_sub, INTEGER, COUNTER );
        p_input->p->counters.p_sout_send_bitrate = NULL;
        p_input->p->counters.p_sout_sent_packets = NULL;
        p_input->p->counters.p_sout_sent_bytes = NULL;
        if( p_input->p->counters.p_demux_bitrate )
            p_input->p->counters.p_demux_bitrate->update_interval = 1000000;
        if( p_input->p->counters.p_input_bitrate )
            p_input->p->counters.p_input_bitrate->update_interval = 1000000;
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    }
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}
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#ifdef ENABLE_SOUT
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static int InitSout( input_thread_t * p_input )
{
    char *psz;

    if( p_input->b_preparsing ) return VLC_SUCCESS;

    /* Find a usable sout and attach it to p_input */
    psz = var_GetNonEmptyString( p_input, "sout" );
    if( psz && strncasecmp( p_input->p->input.p_item->psz_uri, "vlc:", 4 ) )
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    {
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        /* Check the validity of the provided sout */
        if( p_input->p->p_sout )
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        {
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            if( strcmp( p_input->p->p_sout->psz_sout, psz ) )
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            {
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                msg_Dbg( p_input, "destroying unusable sout" );
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                sout_DeleteInstance( p_input->p->p_sout );
                p_input->p->p_sout = NULL;
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            }
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        }
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        if( p_input->p->p_sout )
        {
            /* Reuse it */
            msg_Dbg( p_input, "sout keep: reusing sout" );
            msg_Dbg( p_input, "sout keep: you probably want to use "
                              "gather stream_out" );
            vlc_object_attach( p_input->p->p_sout, p_input );
        }
        else
        {
            /* Create a new one */
            p_input->p->p_sout = sout_NewInstance( p_input, psz );
            if( !p_input->p->p_sout )
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            {
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                input_ChangeState( p_input, ERROR_S );
                msg_Err( p_input, "cannot start stream output instance, " \
                                  "aborting" );
                free( psz );
                return VLC_EGENERIC;
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            }
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        }
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        if( libvlc_stats (p_input) )
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        {
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            INIT_COUNTER( sout_sent_packets, INTEGER, COUNTER );
            INIT_COUNTER (sout_sent_bytes, INTEGER, COUNTER );
            INIT_COUNTER( sout_send_bitrate, FLOAT, DERIVATIVE );
            if( p_input->p->counters.p_sout_send_bitrate )
                 p_input->p->counters.p_sout_send_bitrate->update_interval =
                         1000000;
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        }
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    }
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    else if( p_input->p->p_sout )
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    {
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        msg_Dbg( p_input, "destroying useless sout" );

        sout_DeleteInstance( p_input->p->p_sout );
        p_input->p->p_sout = NULL;
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    }
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    free( psz );