input.c

VLC Player Source Code

/*****************************************************************************
 * input.c: input thread
 *****************************************************************************
 * Copyright (C) 1998-2007 the VideoLAN team
 * $Id: bbccf7e925518293c219eaf932e25250de2208ed $
 *
 * Authors: Christophe Massiot <[e-mail]>
 *          Laurent Aimar <[e-mail]>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>

#include <ctype.h>
#include <limits.h>
#include <assert.h>

#include "input_internal.h"

#include <vlc_sout.h>
#include "../stream_output/stream_output.h"

#include <vlc_interface.h>
#include <vlc_url.h>
#include <vlc_charset.h>

#ifdef HAVE_SYS_STAT_H
#   include <sys/stat.h>
#endif

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

static  void* Run            ( vlc_object_t *p_this );
static  void* RunAndDestroy  ( vlc_object_t *p_this );

static input_thread_t * Create  ( vlc_object_t *, input_item_t *,
                                  const char *, bool, sout_instance_t * );
static  int             Init    ( input_thread_t *p_input );
static void             WaitDie   ( input_thread_t *p_input );
static void             End     ( input_thread_t *p_input );
static void             MainLoop( input_thread_t *p_input );

static inline int ControlPopNoLock( input_thread_t *, int *, vlc_value_t * );
static void       ControlReduce( input_thread_t * );
static bool Control( input_thread_t *, int, vlc_value_t );

static int  UpdateFromAccess( input_thread_t * );
static int  UpdateFromDemux( input_thread_t * );

static void UpdateItemLength( input_thread_t *, int64_t i_length );

static void MRLSections( input_thread_t *, char *, int *, int *, int *, int *);

static input_source_t *InputSourceNew( input_thread_t *);
static int  InputSourceInit( input_thread_t *, input_source_t *,
                             const char *, const char *psz_forced_demux );
static void InputSourceClean( input_source_t * );
/* TODO */
//static void InputGetAttachments( input_thread_t *, input_source_t * );
static void SlaveDemux( input_thread_t *p_input );
static void SlaveSeek( input_thread_t *p_input );

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 );

static void DemuxMeta( input_thread_t *p_input, vlc_meta_t *p_meta, demux_t *p_demux );
static void AccessMeta( input_thread_t * p_input, vlc_meta_t *p_meta );
static void AppendAttachment( int *pi_attachment, input_attachment_t ***ppp_attachment,
                              int i_new, input_attachment_t **pp_new );

/*****************************************************************************
 * This function creates a new input, and returns a pointer
 * to its description. On error, it returns NULL.
 *
 * 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
 *  - audio-delay, spu-delay
 *  - bookmark
 * * Get only:
 *  - length
 *  - bookmarks
 *  - seekable (if you can seek, it doesn't say if 'bar display' has be shown
 *    or not, for that check position != 0.0)
 *  - can-pause
 *  - teletext-es to get the index of spu track that is teletext --1 if no teletext)
 * * For intf callback upon changes:
 *  - intf-change
 *  - intf-change-vout for when a vout is created or destroyed
 *  - rate-change for when playback rate changes
 * TODO explain when Callback is called
 * TODO complete this list (?)
 *****************************************************************************/
static input_thread_t *Create( vlc_object_t *p_parent, input_item_t *p_item,
                               const char *psz_header, bool b_quick,
                               sout_instance_t *p_sout )
{
    static const char input_name[] = "input";
    input_thread_t *p_input = NULL;                 /* thread descriptor */
    vlc_value_t val;
    int i;

    /* Allocate descriptor */
    p_input = vlc_custom_create( p_parent, sizeof( *p_input ),
                                 VLC_OBJECT_INPUT, input_name );
    if( p_input == NULL )
        return NULL;

    /* 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 );

    msg_Dbg( p_input, "Creating an input for '%s'", psz_name);

    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 );

    MALLOC_NULL( p_input->p, input_thread_private_t );
    memset( p_input->p, 0, sizeof( input_thread_private_t ) );

    /* 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_stats && !b_quick )
    {
        libvlc_priv_t *priv = libvlc_priv (p_input->p_libvlc);
        vlc_mutex_lock( &p_input->p_libvlc->p_stats->lock );
        if( priv->p_stats_computer == NULL )
            priv->p_stats_computer = p_input;
        vlc_mutex_unlock( &p_input->p_libvlc->p_stats->lock );
    }

    p_input->b_preparsing = b_quick;
    p_input->psz_header = psz_header ? strdup( psz_header ) : NULL;

    /* Init events */
    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 );
    vlc_event_manager_register_event_type( p_em, vlc_InputSelectedStreamChanged );

    /* Init Common fields */
    p_input->b_eof = false;
    p_input->b_can_pace_control = true;
    p_input->p->i_start = 0;
    p_input->i_time  = 0;
    p_input->p->i_stop  = 0;
    p_input->p->i_run  = 0;
    p_input->p->i_title = 0;
    p_input->p->title   = NULL;
    p_input->p->i_title_offset = p_input->p->i_seekpoint_offset = 0;
    p_input->i_state = INIT_S;
    p_input->p->i_rate  = INPUT_RATE_DEFAULT;
    TAB_INIT( p_input->p->i_bookmark, p_input->p->bookmark );
    TAB_INIT( p_input->p->i_attachment, p_input->p->attachment );
    p_input->p->p_es_out = NULL;
    p_input->p->p_sout  = NULL;
    p_input->p->b_out_pace_control = false;
    p_input->i_pts_delay = 0;

    /* Init Input fields */
    vlc_gc_incref( p_item ); /* Released in Destructor() */
    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 = 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 = 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;
    p_input->p->input.i_cr_average = 0;

    vlc_mutex_lock( &p_item->lock );

    if( !p_item->p_stats )
        p_item->p_stats = stats_NewInputStats( p_input );
    vlc_mutex_unlock( &p_item->lock );

    /* No slave */
    p_input->p->i_slave = 0;
    p_input->p->slave   = NULL;

    /* Init control buffer */
    vlc_mutex_init( &p_input->p->lock_control );
    p_input->p->i_control = 0;

    /* Parse input options */
    vlc_mutex_lock( &p_item->lock );
    assert( (int)p_item->optflagc == p_item->i_options );
    for( i = 0; i < p_item->i_options; i++ )
        var_OptionParse( VLC_OBJECT(p_input), p_item->ppsz_options[i],
                         !!(p_item->optflagv[i] & VLC_INPUT_OPTION_TRUSTED) );
    vlc_mutex_unlock( &p_item->lock );

    /* Create Object Variables for private use only */
    input_ConfigVarInit( p_input );

    /* Create Objects variables for public Get and Set */
    input_ControlVarInit( p_input );

    p_input->p->input.i_cr_average = var_GetInteger( p_input, "cr-average" );

    if( !p_input->b_preparsing )
    {
        var_Get( p_input, "bookmarks", &val );
        if( val.psz_string )
        {
            /* 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, '{' ) ) )
            {
                 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 ) )
                     {
                         p_seekpoint->psz_name = strdup(psz_start + 5);
                     }
                     else if( !strncmp( psz_start, "bytes=", 6 ) )
                     {
                         p_seekpoint->i_byte_offset = atoll(psz_start + 6);
                     }
                     else if( !strncmp( psz_start, "time=", 5 ) )
                     {
                         p_seekpoint->i_time_offset = atoll(psz_start + 5) *
                                                        1000000;
                     }
                     psz_start = psz_end + 1;
                }
                msg_Dbg( p_input, "adding bookmark: %s, bytes=%"PRId64", time=%"PRId64,
                                  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;
            }
            free( val.psz_string );
        }
    }

    /* Remove 'Now playing' info as it is probably outdated */
    input_item_SetNowPlaying( p_item, NULL );

    /* */
    if( p_input->b_preparsing )
        p_input->i_flags |= OBJECT_FLAGS_QUIET | OBJECT_FLAGS_NOINTERACT;

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

    memset( &p_input->p->counters, 0, sizeof( p_input->p->counters ) );
    vlc_mutex_init( &p_input->p->counters.counters_lock );

    /* Set the destructor when we are sure we are initialized */
    vlc_object_set_destructor( p_input, (vlc_destructor_t)Destructor );

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

    return p_input;
}

/**
 * Input destructor (called when the object's refcount reaches 0).
 */
static void Destructor( input_thread_t * p_input )
{
    input_thread_private_t *priv = p_input->p;

#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

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

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

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

    vlc_mutex_destroy( &priv->lock_control );
    free( priv );
}

/**
 * Initialize an input thread and run it. You will need to monitor the
 * thread to clean up after it is done
 *
 * \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 )
{
    return __input_CreateThreadExtended( p_parent, p_item, NULL, NULL );
}

/* */
input_thread_t *__input_CreateThreadExtended( vlc_object_t *p_parent,
                                              input_item_t *p_item,
                                              const char *psz_log, sout_instance_t *p_sout )
{
    input_thread_t *p_input;

    p_input = Create( p_parent, p_item, psz_log, false, p_sout );
    if( !p_input )
        return NULL;

    /* Create thread and wait for its readiness. */
    if( vlc_thread_create( p_input, "input", Run,
                           VLC_THREAD_PRIORITY_INPUT, true ) )
    {
        input_ChangeState( p_input, ERROR_S );
        msg_Err( p_input, "cannot create input thread" );
        vlc_object_detach( p_input );
        vlc_object_release( p_input );
        return NULL;
    }

    return p_input;
}