input.c 93.9 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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#include <vlc/vlc.h>
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#include <ctype.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_playlist.h>
#include <vlc_interface.h>
#include <vlc_url.h>
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#include <vlc_demux.h>
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#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  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 *, vlc_bool_t, sout_instance_t * );
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static  int             Init    ( input_thread_t *p_input );
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static void             Error   ( input_thread_t *p_input );
static void             End     ( input_thread_t *p_input );
static void             MainLoop( input_thread_t *p_input );
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static void             Destroy( input_thread_t *p_input, sout_instance_t **pp_sout );
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static inline int ControlPopNoLock( input_thread_t *, int *, vlc_value_t * );
static void       ControlReduce( input_thread_t * );
static vlc_bool_t 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 sout_instance_t *SoutFind( vlc_object_t *p_parent, input_item_t *p_item, vlc_bool_t * );
static void SoutKeep( sout_instance_t * );

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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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 * * For intf callback upon changes
 *  - intf-change
 * 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, vlc_bool_t b_quick, sout_instance_t *p_sout )
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{
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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_object_create( p_parent, VLC_OBJECT_INPUT );
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    if( p_input == NULL )
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    {
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        msg_Err( p_parent, "out of memory" );
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        return NULL;
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    }
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    MALLOC_NULL( p_input->p, 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 */
    if( p_input->p_libvlc->p_playlist->p_stats && !b_quick )
    {
        vlc_mutex_lock( &p_input->p_libvlc->p_playlist->p_stats->lock );
        if( p_input->p_libvlc->p_playlist->p_stats_computer == NULL )
        {
            p_input->p_libvlc->p_playlist->p_stats_computer = p_input;
        }
        vlc_mutex_unlock( &p_input->p_libvlc->p_playlist->p_stats->lock );
    }

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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 Common fields */
    p_input->b_eof = VLC_FALSE;
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    p_input->b_can_pace_control = VLC_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_sout_keep  = VLC_FALSE;
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    p_input->p->b_out_pace_control = VLC_FALSE;
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    p_input->i_pts_delay = 0;

    /* Init Input fields */
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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;
    p_input->p->input.b_title_demux = VLC_FALSE;
    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;
    p_input->p->input.b_can_pace_control = VLC_TRUE;
    p_input->p->input.b_eof = VLC_FALSE;
    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_input->p->lock_control );
    p_input->p->i_control = 0;
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    /* Parse input options */
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    vlc_mutex_lock( &p_item->lock );
    for( i = 0; i < p_item->i_options; i++ )
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        var_OptionParse( p_input, p_item->ppsz_options[i] );
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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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    vlc_mutex_lock( &p_item->lock );
    if( p_item->p_meta && (p_item->p_meta->i_status & ITEM_PREPARSED ) )
        var_SetBool( p_input, "meta-preparsed", VLC_TRUE );
    vlc_mutex_unlock( &p_item->lock );


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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="I64Fd", time="I64Fd,
                                  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_Control( p_input, INPUT_DEL_INFO,
        _(VLC_META_INFO_CAT),
        _(VLC_META_NOW_PLAYING) );
    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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    /* Attach only once we are ready */
    vlc_object_attach( p_input, p_parent );

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    return p_input;
}

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static void Destroy( input_thread_t *p_input, sout_instance_t **pp_sout )
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{
    vlc_object_detach( p_input );
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    input_thread_private_t *priv = p_input->p;
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    if( pp_sout )
        *pp_sout = NULL;
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    if( priv->p_sout )
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    {
        if( pp_sout )
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            *pp_sout = priv->p_sout;
        else if( priv->b_sout_keep )
            SoutKeep( priv->p_sout );
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        else
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            sout_DeleteInstance( priv->p_sout );
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    }

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    vlc_object_destroy( p_input );
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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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    vlc_bool_t b_sout_keep;
    sout_instance_t *p_sout = SoutFind( p_parent, p_item, &b_sout_keep );
    input_thread_t *p_input =  __input_CreateThreadExtended( p_parent, p_item, NULL, p_sout );

    if( !p_input && p_sout )
        SoutKeep( p_sout );

    p_input->p->b_sout_keep = b_sout_keep;
    return p_input;
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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, VLC_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, VLC_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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        Destroy( p_input, &p_sout );
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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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/**
 * Initialize an input thread and run it. This thread will clean after himself,
 * 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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                   vlc_bool_t b_block )
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{
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    vlc_bool_t b_sout_keep;
    sout_instance_t *p_sout = SoutFind( p_parent, p_item, &b_sout_keep );
    input_thread_t *p_input;
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    p_input = Create( p_parent, p_item, NULL, VLC_FALSE, p_sout );
    if( !p_input && p_sout )
    {
        SoutKeep( p_sout );
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        return VLC_EGENERIC;
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    }
    p_input->p->b_sout_keep = b_sout_keep;
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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, VLC_TRUE ) )
        {
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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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            Destroy( p_input, NULL );
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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, VLC_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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    Destroy( p_input, NULL );
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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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void input_StopThread( input_thread_t *p_input )
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{
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    vlc_list_t *p_list;
    int i;
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    /* Set die for input */
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    vlc_object_kill( p_input );
    /* FIXME: seems to be duplicated in ControlPush(INPUT_CONTROL_SET_DIE) */
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    /* We cannot touch p_input fields directly (we come from another thread),
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     * so use the vlc_object_find way, it's perfectly safe */
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    /* Set die for all access */
    p_list = vlc_list_find( p_input, VLC_OBJECT_ACCESS, FIND_CHILD );
    for( i = 0; i < p_list->i_count; i++ )
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    {
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        vlc_object_kill( p_list->p_values[i].p_object );
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    }
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    vlc_list_release( p_list );
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    /* Set die for all stream */
    p_list = vlc_list_find( p_input, VLC_OBJECT_STREAM, FIND_CHILD );
    for( i = 0; i < p_list->i_count; i++ )
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    {
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        vlc_object_kill( p_list->p_values[i].p_object );
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    }
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    vlc_list_release( p_list );
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    /* Set die for all demux */
    p_list = vlc_list_find( p_input, VLC_OBJECT_DEMUX, FIND_CHILD );
    for( i = 0; i < p_list->i_count; i++ )
    {
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        vlc_object_kill( p_list->p_values[i].p_object );
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    }
    vlc_list_release( p_list );
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    input_ControlPush( p_input, INPUT_CONTROL_SET_DIE, NULL );
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}

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/**
 * Clean up a dead input thread
 * This function does not return until the thread is effectively cancelled.
 *
 * \param the input thread to kill
 */
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void input_DestroyThread( input_thread_t *p_input )
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{
    input_DestroyThreadExtended( p_input, NULL );
}

void input_DestroyThreadExtended( input_thread_t *p_input, sout_instance_t **pp_sout )
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{
    /* Join the thread */
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    vlc_thread_join( p_input );
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    /* */
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    Destroy( p_input, pp_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 = VLC_TRUE;
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        playlist_Signal( pl_Get( p_input ) );
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        Error( p_input );
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        /* Tell we're dead */
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        p_input->b_dead = VLC_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 */
        p_input->b_eof = VLC_TRUE;
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        playlist_Signal( pl_Get( p_input ) );
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    }

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

    /* 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 */
        p_input->b_eof = VLC_TRUE;
    }

    /* Clean up */
    End( p_input );

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exit:
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    /* Release memory */
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    Destroy( p_input, NULL );
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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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    while( !p_input->b_die && !p_input->b_error && !p_input->p->input.b_eof )
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    {
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        vlc_bool_t b_force_update = VLC_FALSE;
        int i_ret;
        int i_type;
        vlc_value_t val;
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        /* Do the read */
        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 = VLC_TRUE;
                }
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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 = VLC_TRUE;
                }
            }
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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. */
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                    input_ChangeState( p_input, END_S );
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                    msg_Dbg( p_input, "EOF reached" );
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                    p_input->p->input.b_eof = VLC_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 )
            {
                p_input->b_error = VLC_TRUE;
            }
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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 ) )
                b_force_update = VLC_TRUE;
        }
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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( !demux2_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( !demux2_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( !demux2_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", VLC_TRUE );
            i_intf_update = mdate() + I64C(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 ? */
            if( p_input->p_libvlc->p_playlist->p_stats_computer == p_input )
            {
                stats_ComputeGlobalStats( p_input->p_libvlc->p_playlist,
                                     p_input->p_libvlc->p_playlist->p_stats );
            }
        }
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    }
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}

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static int Init( input_thread_t * p_input )
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{
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    char *psz;
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    char *psz_subtitle;
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    vlc_value_t val;
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    double f_fps;
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    vlc_meta_t *p_meta;
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    int i_es_out_mode;
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    int i, i_delay;
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    /* Initialize optional stream output. (before access/demuxer)
     * XXX: we add a special case if the uri starts by vlc.
     * else 'vlc in.file --sout "" vlc:quit'  cannot work (the output will
     * be destroyed in case of a file).
     * (this will break playing of file starting by 'vlc:' but I don't
     * want to add more logic, just force file by file:// or code it ;)
     */
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    memset( &p_input->p->counters, 0, sizeof( p_input->p->counters ) );
    vlc_mutex_init( p_input, &p_input->p->counters.counters_lock );
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    for( i = 0; i < p_input->p->input.p_item->i_options; i++ )
    {
        if( !strncmp( p_input->p->input.p_item->ppsz_options[i], "meta-file", 9 ) )
        {
            msg_Dbg( p_input, "Input is a meta file: disabling unneeded options" );
            var_SetString( p_input, "sout", "" );
            var_SetBool( p_input, "sout-all", VLC_FALSE );
            var_SetString( p_input, "input-slave", "" );
            var_SetInteger( p_input, "input-repeat", 0 );
            var_SetString( p_input, "sub-file", "" );
            var_SetBool( p_input, "sub-autodetect-file", VLC_FALSE );
        }
    }

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    if( !p_input->b_preparsing )
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    {
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        /* Prepare statistics */
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#define INIT_COUNTER( c, type, compute ) p_input->p->counters.p_##c = \
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     stats_CounterCreate( p_input, VLC_VAR_##type, STATS_##compute);
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        if( p_input->p_libvlc->b_stats )
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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 );
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            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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        /* Find a usable sout and attach it to p_input */
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        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 )
            {
                if( strcmp( p_input->p->p_sout->psz_sout, psz ) )
                {
                    msg_Dbg( p_input, "destroying unusable sout" );

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

            if( p_input->p->p_sout )
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            {
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                /* 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 );
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            }
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            else
            {
                /* Create a new one */
                p_input->p->p_sout = sout_NewInstance( p_input, psz );

                if( !p_input->p->p_sout )
                {
                    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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            if( p_input->p_libvlc->b_stats )
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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 );
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                if( p_input->p->counters.p_sout_send_bitrate )
                     p_input->p->counters.p_sout_send_bitrate->update_interval =
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                             1000000;
            }
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        }
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        else if( p_input->p->p_sout )
        {
            msg_Dbg( p_input, "destroying useless sout" );

            sout_DeleteInstance( p_input->p->p_sout );
            p_input->p->p_sout = NULL;
        }
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        free( psz );
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    }
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    /* Create es out */
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    p_input->p->p_es_out = input_EsOutNew( p_input );
    es_out_Control( p_input->p->p_es_out, ES_OUT_SET_ACTIVE, VLC_FALSE );
    es_out_Control( p_input->p->p_es_out, ES_OUT_SET_MODE, ES_OUT_MODE_NONE );
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