sub.c

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/*****************************************************************************
 * sub.c: subtitle demux for external subtitle files
 *****************************************************************************
 * Copyright (C) 1999-2004 VideoLAN
 * $Id: sub.c,v 1.52 2004/02/22 15:59:53 fenrir Exp $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Derk-Jan Hartman <hartman at videolan dot org>
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <ctype.h>

#include <vlc/vlc.h>
#include <vlc/input.h>
#include "vlc_video.h"
#include <codecs.h>

#include "sub.h"

#if (!defined( WIN32 ) || defined(__MINGW32__))
#    include <dirent.h>
#endif

#define DVD_VIDEO_LB_LEN 2048

static int  Open ( vlc_object_t *p_this );

static int  sub_open ( subtitle_demux_t *p_sub,
                       input_thread_t  *p_input,
                       char  *psz_name,
                       mtime_t i_microsecperframe );
static int  sub_demux( subtitle_demux_t *p_sub, mtime_t i_maxdate );
static int  sub_seek ( subtitle_demux_t *p_sub, mtime_t i_date );
static void sub_close( subtitle_demux_t *p_sub );

static void sub_fix( subtitle_demux_t *p_sub );

static char *ppsz_sub_type[] = { "auto", "microdvd", "subrip", "ssa1",
  "ssa2-4", "vplayer", "sami", "vobsub" };

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define SUB_DELAY_LONGTEXT \
    "Delay subtitles (in 1/10s)"
#define SUB_FPS_LONGTEXT \
    "Override frames per second. " \
    "It will only work with MicroDVD subtitles."
#define SUB_TYPE_LONGTEXT \
    "One from \"microdvd\", \"subrip\", \"ssa1\", \"ssa2-4\", \"vplayer\" " \
    "\"sami\" (auto for autodetection, it should always work)."

vlc_module_begin();
    set_description( _("Text subtitles demux") );
    set_capability( "subtitle demux", 12 );
    add_float( "sub-fps", 25.0, NULL,
               N_("Frames per second"),
               SUB_FPS_LONGTEXT, VLC_TRUE );
    add_integer( "sub-delay", 0, NULL,
                 N_("Delay subtitles (in 1/10s)"),
                 SUB_DELAY_LONGTEXT, VLC_TRUE );
    add_string( "sub-type", "auto", NULL, "Subtitles fileformat",
                SUB_TYPE_LONGTEXT, VLC_TRUE );
        change_string_list( ppsz_sub_type, 0, 0 );
    set_callbacks( Open, NULL );
vlc_module_end();

/*****************************************************************************
 * Module initializer
 *****************************************************************************/
static int Open ( vlc_object_t *p_this )
{
    subtitle_demux_t *p_sub = (subtitle_demux_t*)p_this;

    p_sub->pf_open  = sub_open;
    p_sub->pf_demux = sub_demux;
    p_sub->pf_seek  = sub_seek;
    p_sub->pf_close = sub_close;
    
    /* Initialize the variables */
    var_Create( p_this, "sub-fps", VLC_VAR_FLOAT | VLC_VAR_DOINHERIT );
    var_Create( p_this, "sub-delay", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_this, "sub-type", VLC_VAR_STRING | VLC_VAR_DOINHERIT );

    return VLC_SUCCESS;
}
#define MAX_TRY     256
#define MAX_LINE    2048

#define FREE( p ) if( p ) { free( p); (p) = NULL; }

typedef struct
{
    int     i_line_count;
    int     i_line;
    char    **line;
} text_t;

static int  text_load( text_t *txt, char *psz_name )
{
    FILE *f;
    int   i_line_max;

    /* init txt */
    i_line_max          = 100;
    txt->i_line_count   = 0;
    txt->i_line         = 0;
    txt->line           = calloc( i_line_max, sizeof( char * ) );

    /* open file */
    if( !( f = fopen( psz_name, "rb" ) ) )
    {
        return VLC_EGENERIC;
    }

    /* load the complete file */
    for( ;; )
    {
        char buffer[8096];
        char *p;

        if( fgets( buffer, 8096, f ) <= 0)
        {
            break;
        }
        while( ( p = strchr( buffer, '\r' ) ) )
        {
            *p = '\0';
        }
        while( ( p = strchr( buffer, '\n' ) ) )
        {
            *p = '\0';
        }

        txt->line[txt->i_line_count++] = strdup( buffer );

        if( txt->i_line_count >= i_line_max )
        {
            i_line_max += 100;
            txt->line = realloc( txt->line, i_line_max * sizeof( char*) );
        }
    }

    fclose( f );

    if( txt->i_line_count <= 0 )
    {
        FREE( txt->line );
        return( VLC_EGENERIC );
    }

    return( VLC_SUCCESS );
}
static void text_unload( text_t *txt )
{
    int i;

    for( i = 0; i < txt->i_line_count; i++ )
    {
        FREE( txt->line[i] );
    }
    FREE( txt->line );
    txt->i_line       = 0;
    txt->i_line_count = 0;
}

static char *text_get_line( text_t *txt )
{
    if( txt->i_line >= txt->i_line_count )
    {
        return( NULL );
    }

    return( txt->line[txt->i_line++] );
}
static void text_previous_line( text_t *txt )
{
    if( txt->i_line > 0 )
    {
        txt->i_line--;
    }
}
static void text_rewind( text_t *txt )
{
    txt->i_line = 0;
}

static int  sub_MicroDvdRead( subtitle_demux_t *p_sub, text_t *txt, subtitle_t *p_subtitle, mtime_t i_microsecperframe );
static int  sub_SubRipRead  ( subtitle_demux_t *p_sub, text_t *txt, subtitle_t *p_subtitle, mtime_t i_microsecperframe );
static int  sub_SSARead     ( subtitle_demux_t *p_sub, text_t *txt, subtitle_t *p_subtitle, mtime_t i_microsecperframe );
static int  sub_Vplayer     ( subtitle_demux_t *p_sub, text_t *txt, subtitle_t *p_subtitle, mtime_t i_microsecperframe );
static int  sub_Sami        ( subtitle_demux_t *p_sub, text_t *txt, subtitle_t *p_subtitle, mtime_t i_microsecperframe );
static int  sub_VobSubIDX   ( subtitle_demux_t *p_sub, text_t *txt, subtitle_t *p_subtitle, mtime_t i_microsecperframe );

static int  DemuxVobSub     ( subtitle_demux_t *, block_t * );

static struct
{
    char *psz_type_name;
    int  i_type;
    char *psz_name;
    int  (*pf_read_subtitle)    ( subtitle_demux_t *, text_t *, subtitle_t*, mtime_t );
} sub_read_subtitle_function [] =
{
    { "microdvd",   SUB_TYPE_MICRODVD,  "MicroDVD", sub_MicroDvdRead },
    { "subrip",     SUB_TYPE_SUBRIP,    "SubRIP",   sub_SubRipRead },
    { "ssa1",       SUB_TYPE_SSA1,      "SSA-1",    sub_SSARead },
    { "ssa2-4",     SUB_TYPE_SSA2_4,    "SSA-2/3/4",sub_SSARead },
    { "vplayer",    SUB_TYPE_VPLAYER,   "VPlayer",  sub_Vplayer },
    { "sami",       SUB_TYPE_SAMI,      "SAMI",     sub_Sami },
    { "vobsub",     SUB_TYPE_VOBSUB,    "VobSub",   sub_VobSubIDX },
    { NULL,         SUB_TYPE_UNKNOWN,   "Unknown",  NULL }
};

static char * local_stristr( char *psz_big, char *psz_little)
{
    char *p_pos = psz_big;

    if (!psz_big || !psz_little || !*psz_little) return psz_big;

    while (*p_pos)
    {
        if (toupper(*p_pos) == toupper(*psz_little))
        {
            char * psz_cur1 = p_pos + 1;
            char * psz_cur2 = psz_little + 1;
            while (*psz_cur1 && *psz_cur2 && toupper(*psz_cur1) == toupper(*psz_cur2))
            {
                psz_cur1++;
                psz_cur2++;
            }
            if (!*psz_cur2) return p_pos;
        }
        p_pos++;
    }
    return NULL;
}

/*****************************************************************************
 * sub_open: Open a subtitle file and add subtitle ES
 *****************************************************************************/
static int sub_open( subtitle_demux_t *p_sub, input_thread_t  *p_input,
                     char *psz_name, mtime_t i_microsecperframe )
{
    text_t  txt;
    vlc_value_t val;
    es_format_t fmt;
    int i, i_sub_type, i_max;
    int (*pf_read_subtitle)( subtitle_demux_t *, text_t *, subtitle_t *,
                             mtime_t ) = NULL;

    p_sub->i_sub_type = SUB_TYPE_UNKNOWN;
    p_sub->p_es = NULL;
    p_sub->i_subtitles = 0;
    p_sub->subtitle = NULL;
    p_sub->p_vobsub_file = 0;
    p_sub->p_input = p_input;

    if( !psz_name || !*psz_name )
    {
        msg_Err( p_sub, "no subtitle file specified" );
        return VLC_EGENERIC;
    }

    /* *** load the file *** */
    if( text_load( &txt, psz_name ) )
    {
        msg_Err( p_sub, "cannot open `%s' subtitle file", psz_name );
        return VLC_EGENERIC;
    }

    msg_Dbg( p_sub, "opened `%s'", psz_name );

    var_Get( p_sub, "sub-fps", &val );
    if( val.i_int >= 1.0 )
    {
        i_microsecperframe = (mtime_t)( (float)1000000 / val.f_float );
    }
    else if( val.f_float <= 0 )
    {
        i_microsecperframe = 40000; /* default: 25fps */
    }

    var_Get( p_sub, "sub-type", &val);
    if( val.psz_string && *val.psz_string )
    {
        int i;

        for( i = 0; ; i++ )
        {
            if( sub_read_subtitle_function[i].psz_type_name == NULL )
            {
                i_sub_type = SUB_TYPE_UNKNOWN;
                break;
            }
            if( !strcmp( sub_read_subtitle_function[i].psz_type_name,
                         val.psz_string ) )
            {
                i_sub_type = sub_read_subtitle_function[i].i_type;
                break;
            }
        }
    }
    else
    {
        i_sub_type = SUB_TYPE_UNKNOWN;
    }
    FREE( val.psz_string );

    /* *** Now try to autodetect subtitle format *** */
    if( i_sub_type == SUB_TYPE_UNKNOWN )
    {
        int     i_try;
        char    *s;

        msg_Dbg( p_input, "trying to autodetect file format" );
        for( i_try = 0; i_try < MAX_TRY; i_try++ )
        {
            int i_dummy;

            if( ( s = text_get_line( &txt ) ) == NULL )
            {
                break;
            }

            if( local_stristr( s, "<SAMI>" ) )
            {
                i_sub_type = SUB_TYPE_SAMI;
                break;
            }
            else if( sscanf( s, "{%d}{%d}", &i_dummy, &i_dummy ) == 2 ||
                     sscanf( s, "{%d}{}", &i_dummy ) == 1)
            {
                i_sub_type = SUB_TYPE_MICRODVD;
                break;
            }
            else if( sscanf( s,
                             "%d:%d:%d,%d --> %d:%d:%d,%d",
                             &i_dummy,&i_dummy,&i_dummy,&i_dummy,
                             &i_dummy,&i_dummy,&i_dummy,&i_dummy ) == 8 )
            {
                i_sub_type = SUB_TYPE_SUBRIP;
                break;
            }
            else if( sscanf( s,
                             "!: This is a Sub Station Alpha v%d.x script.",
                             &i_dummy ) == 1)
            {
                if( i_dummy <= 1 )
                {
                    i_sub_type = SUB_TYPE_SSA1;
                }
                else
                {
                    i_sub_type = SUB_TYPE_SSA2_4; /* I hope this will work */
                }
                break;
            }
            else if( local_stristr( s, "This is a Sub Station Alpha v4 script" ) )
            {
                i_sub_type = SUB_TYPE_SSA2_4; /* I hope this will work */
                break;
            }
            else if( !strncasecmp( s, "Dialogue: Marked", 16  ) )
            {
                i_sub_type = SUB_TYPE_SSA2_4; /* could be wrong */
                break;
            }
            else if( sscanf( s, "%d:%d:%d:", &i_dummy, &i_dummy, &i_dummy ) == 3 ||
                     sscanf( s, "%d:%d:%d ", &i_dummy, &i_dummy, &i_dummy ) == 3 )
            {
                i_sub_type = SUB_TYPE_VPLAYER;
                break;
            }
            else if( local_stristr( s, "# VobSub index file" ) )
            {
                i_sub_type = SUB_TYPE_VOBSUB;
                break;
            }
        }

        text_rewind( &txt );
    }

    /* *** Load this file in memory *** */
    for( i = 0; ; i++ )
    {
        if( sub_read_subtitle_function[i].i_type == SUB_TYPE_UNKNOWN )