input.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * input.c: input thread
 *****************************************************************************
 * Copyright (C) 1998-2004 the VideoLAN team
 * $Id: input.c 17365 2006-10-30 08:28:18Z jpsaman $
 *
 * 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
 *****************************************************************************/
#include <stdlib.h>
#include <ctype.h>

#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc/decoder.h>
#include <vlc/vout.h>

#include "input_internal.h"

#include "stream_output.h"
#include "vlc_playlist.h"
#include "vlc_interface.h"
#include "vlc_interaction.h"

#include "charset.h"

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static  int Run  ( input_thread_t *p_input );
static  int RunAndClean  ( input_thread_t *p_input );

static input_thread_t * Create  ( vlc_object_t *, input_item_t *, char *,
                                  vlc_bool_t );
static  int             Init    ( input_thread_t *p_input, vlc_bool_t b_quick );
static void             Error   ( 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 vlc_bool_t Control( input_thread_t *, int, vlc_value_t );


static int  UpdateFromAccess( input_thread_t * );
static int  UpdateFromDemux( input_thread_t * );
static int  UpdateMeta( input_thread_t *, vlc_bool_t );

static void UpdateItemLength( input_thread_t *, int64_t i_length, vlc_bool_t );

static void DecodeUrl( char * );
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 *,
                             char *, char *psz_forced_demux,
                             vlc_bool_t b_quick );
static void InputSourceClean( input_thread_t *, input_source_t * );

static void SlaveDemux( input_thread_t *p_input );
static void SlaveSeek( input_thread_t *p_input );

static vlc_meta_t *InputMetaUser( input_thread_t *p_input );

/*****************************************************************************
 * 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)
 * * For intf callback upon changes
 *  - intf-change
 * 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,
                               char *psz_header, vlc_bool_t b_quick )
{
    input_thread_t *p_input = NULL;                 /* thread descriptor */
    vlc_value_t val;
    int i;

    /* Allocate descriptor */
    p_input = vlc_object_create( p_parent, VLC_OBJECT_INPUT );
    if( p_input == NULL )
    {
        msg_Err( p_parent, "out of memory" );
        return NULL;
    }
    p_input->psz_header = psz_header ? strdup( psz_header ) : NULL;

    /* Init Common fields */
    p_input->b_eof = VLC_FALSE;
    p_input->b_can_pace_control = VLC_TRUE;
    p_input->i_start = 0;
    p_input->i_time  = 0;
    p_input->i_stop  = 0;
    p_input->i_title = 0;
    p_input->title   = NULL;
    p_input->i_title_offset = p_input->i_seekpoint_offset = 0;
    p_input->i_state = INIT_S;
    p_input->i_rate  = INPUT_RATE_DEFAULT;
    p_input->i_bookmark = 0;
    p_input->bookmark = NULL;
    p_input->p_meta  = NULL;
    p_input->p_es_out = NULL;
    p_input->p_sout  = NULL;
    p_input->b_out_pace_control = VLC_FALSE;
    p_input->i_pts_delay = 0;

    /* Init Input fields */
    p_input->input.p_item = p_item;
    p_input->input.p_access = NULL;
    p_input->input.p_stream = NULL;
    p_input->input.p_demux  = NULL;
    p_input->input.b_title_demux = VLC_FALSE;
    p_input->input.i_title  = 0;
    p_input->input.title    = NULL;
    p_input->input.i_title_offset = p_input->input.i_seekpoint_offset = 0;
    p_input->input.b_can_pace_control = VLC_TRUE;
    p_input->input.b_eof = VLC_FALSE;
    p_input->input.i_cr_average = 0;

    stats_ReinitInputStats( p_item->p_stats );

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

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

    /* Parse input options */
    vlc_mutex_lock( &p_item->lock );
    for( i = 0; i < p_item->i_options; i++ )
    {
        var_OptionParse( p_input, p_item->ppsz_options[i] );
    }
    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->input.i_cr_average = var_GetInteger( p_input, "cr-average" );

    if( !b_quick )
    {
        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 = 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="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;
            }
            free( val.psz_string );
        }
    }

    /* Remove 'Now playing' info as it is probably outdated */
    input_Control( p_input, INPUT_DEL_INFO, _(VLC_META_INFO_CAT),
                   VLC_META_NOW_PLAYING );     /* ? Don't translate as it might has been copied ? */

    return p_input;
}

/**
 * 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_CreateThread2( p_parent, p_item, NULL );
}

/* Gruik ! */
input_thread_t *__input_CreateThread2( vlc_object_t *p_parent,
                                       input_item_t *p_item,
                                       char *psz_header )
{
    input_thread_t *p_input = NULL;      /* thread descriptor */

    p_input = Create( p_parent, p_item, psz_header, VLC_FALSE );
    if( !p_input )
        return NULL;

    /* Now we can attach our new input */
    vlc_object_attach( p_input, p_parent );

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

    return p_input;
}

/**
 * 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 ?
 * \return the input object id if non blocking, an error code else
 */
int __input_Read( vlc_object_t *p_parent, input_item_t *p_item,
                   vlc_bool_t b_block )
{
    input_thread_t *p_input = NULL;         /* thread descriptor */

    p_input = Create( p_parent, p_item, NULL, VLC_FALSE );
    if( !p_input )
        return VLC_EGENERIC;

    /* Now we can attach our new input */
    vlc_object_attach( p_input, p_parent );

    if( b_block )
    {
        RunAndClean( p_input );
        return VLC_SUCCESS;
    }
    else
    {
        if( vlc_thread_create( p_input, "input", RunAndClean,
                               VLC_THREAD_PRIORITY_INPUT, VLC_TRUE ) )
        {
            input_ChangeState( p_input, ERROR_S );
            msg_Err( p_input, "cannot create input thread" );
            vlc_object_detach( p_input );
            vlc_object_destroy( p_input );
            return VLC_EGENERIC;
        }
    }
    return p_input->i_object_id;
}

/**
 * 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 )
{
    input_thread_t *p_input = NULL;           /* thread descriptor */

    /* Allocate descriptor */
    p_input = Create( p_parent, p_item, NULL, VLC_TRUE );
    if( !p_input )
        return VLC_EGENERIC;

    p_input->i_flags |= OBJECT_FLAGS_QUIET;
    p_input->i_flags |= OBJECT_FLAGS_NOINTERACT;

    /* Now we can attach our new input */
    vlc_object_attach( p_input, p_parent );

    Init( p_input, VLC_TRUE );

    /* Clean up master */
    InputSourceClean( p_input, &p_input->input );

    /* Unload all modules */
    if( p_input->p_es_out ) input_EsOutDelete( p_input->p_es_out );

    /* Delete meta */
    if( p_input->p_meta ) vlc_meta_Delete( p_input->p_meta );

    vlc_object_detach( p_input );
    vlc_object_destroy( p_input );

    return VLC_SUCCESS;
}

/**
 * Request a running input thread to stop and die
 *
 * \param the input thread to stop
 */
void input_StopThread( input_thread_t *p_input )
{
    vlc_list_t *p_list;
    int i;

    /* Set die for input */
    p_input->b_die = VLC_TRUE;

    /* We cannot touch p_input fields directly (we can from another thread),
     * so use the vlc_object_find way, it's perfectly safe */

    /* 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++ )
    {
        p_list->p_values[i].p_object->b_die = VLC_TRUE;
    }
    vlc_list_release( p_list );