subtitle.c

video linux conference

/*****************************************************************************
 * subtitle.c: Demux for subtitle text files.
 *****************************************************************************
 * Copyright (C) 1999-2004 VideoLAN
 * $Id: subtitle.c 11159 2005-05-24 19:52:57Z hartman $
 *
 * 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>
#ifdef HAVE_SYS_TYPES_H
#   include <sys/types.h>
#endif
#include <ctype.h>

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

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t *p_this );
static void Close( vlc_object_t *p_this );

#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\", \"ass\", \"vplayer\" " \
    "\"sami\" (auto for autodetection, it should always work)."
static char *ppsz_sub_type[] =
{
    "auto", "microdvd", "subrip", "subviewer", "ssa1",
    "ssa2-4", "ass", "vplayer", "sami"
};

vlc_module_begin();
    set_shortname( _("Subtitles"));
    set_description( _("Text subtitles demux") );
    set_capability( "demux2", 0 );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_DEMUX );
    add_float( "sub-fps", 0.0, NULL,
               N_("Frames per second"),
               SUB_FPS_LONGTEXT, VLC_TRUE );
    add_integer( "sub-delay", 0, NULL,
               N_("Subtitles delay"),
               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, Close );

    add_shortcut( "subtitle" );
vlc_module_end();

/*****************************************************************************
 * Prototypes:
 *****************************************************************************/
enum
{
    SUB_TYPE_UNKNOWN = -1,
    SUB_TYPE_MICRODVD,
    SUB_TYPE_SUBRIP,
    SUB_TYPE_SSA1,
    SUB_TYPE_SSA2_4,
    SUB_TYPE_ASS,
    SUB_TYPE_VPLAYER,
    SUB_TYPE_SAMI,
    SUB_TYPE_SUBVIEWER,
};

typedef struct
{
    int     i_line_count;
    int     i_line;
    char    **line;
} text_t;
static int  TextLoad( text_t *, stream_t *s );
static void TextUnload( text_t * );

typedef struct
{
    int64_t i_start;
    int64_t i_stop;

    char    *psz_text;
} subtitle_t;


struct demux_sys_t
{
    int         i_type;
    text_t      txt;
    es_out_id_t *es;

    int64_t     i_next_demux_date;

    int64_t     i_microsecperframe;
    int64_t     i_original_mspf;

    char        *psz_header;
    int         i_subtitle;
    int         i_subtitles;
    subtitle_t  *subtitle;

    int64_t     i_length;
};

static int  ParseMicroDvd ( demux_t *, subtitle_t * );
static int  ParseSubRip   ( demux_t *, subtitle_t * );
static int  ParseSubViewer( demux_t *, subtitle_t * );
static int  ParseSSA      ( demux_t *, subtitle_t * );
static int  ParseVplayer  ( demux_t *, subtitle_t * );
static int  ParseSami     ( demux_t *, subtitle_t * );

static struct
{
    char *psz_type_name;
    int  i_type;
    char *psz_name;
    int  (*pf_read)( demux_t *, subtitle_t* );
} sub_read_subtitle_function [] =
{
    { "microdvd",   SUB_TYPE_MICRODVD,  "MicroDVD", ParseMicroDvd },
    { "subrip",     SUB_TYPE_SUBRIP,    "SubRIP",   ParseSubRip },
    { "subviewer",  SUB_TYPE_SUBVIEWER, "SubViewer",ParseSubViewer },
    { "ssa1",       SUB_TYPE_SSA1,      "SSA-1",    ParseSSA },
    { "ssa2-4",     SUB_TYPE_SSA2_4,    "SSA-2/3/4",ParseSSA },
    { "ass",        SUB_TYPE_ASS,       "SSA/ASS",  ParseSSA },
    { "vplayer",    SUB_TYPE_VPLAYER,   "VPlayer",  ParseVplayer },
    { "sami",       SUB_TYPE_SAMI,      "SAMI",     ParseSami },
    { NULL,         SUB_TYPE_UNKNOWN,   "Unknown",  NULL }
};

static int Demux( demux_t * );
static int Control( demux_t *, int, va_list );

static void Fix( demux_t * );

/*****************************************************************************
 * Module initializer
 *****************************************************************************/
static int Open ( vlc_object_t *p_this )
{
    demux_t     *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys;
    es_format_t fmt;
    float f_fps;
    char *psz_type;
    int  (*pf_read)( demux_t *, subtitle_t* );
    int i, i_max;

    if( strcmp( p_demux->psz_demux, "subtitle" ) )
    {
        msg_Dbg( p_demux, "subtitle demux discarded" );
        return VLC_EGENERIC;
    }

    p_demux->pf_demux = Demux;
    p_demux->pf_control = Control;
    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
    p_sys->psz_header = NULL;
    p_sys->i_subtitle = 0;
    p_sys->i_subtitles= 0;
    p_sys->subtitle   = NULL;


    /* Get the FPS */
    f_fps = var_CreateGetFloat( p_demux, "sub-fps" );
    if( f_fps >= 1.0 )
    {
        p_sys->i_microsecperframe = (int64_t)( (float)1000000 / f_fps );
    }
    else
    {
        p_sys->i_microsecperframe = 0;
    }

    f_fps = var_CreateGetFloat( p_demux, "sub-original-fps" );
    if( f_fps >= 1.0 )
    {
        p_sys->i_original_mspf = (int64_t)( (float)1000000 / f_fps );
    }
    else
    {
        p_sys->i_original_mspf = 0;
    }

    /* Get or probe the type */
    p_sys->i_type = SUB_TYPE_UNKNOWN;
    psz_type = var_CreateGetString( p_demux, "sub-type" );
    if( *psz_type )
    {
        int i;

        for( i = 0; ; i++ )
        {
            if( sub_read_subtitle_function[i].psz_type_name == NULL )
                break;

            if( !strcmp( sub_read_subtitle_function[i].psz_type_name,
                         psz_type ) )
            {
                p_sys->i_type = sub_read_subtitle_function[i].i_type;
                break;
            }
        }
    }
    free( psz_type );

    /* Probe if unknown type */
    if( p_sys->i_type == SUB_TYPE_UNKNOWN )
    {
        int     i_try;
        char    *s = NULL;

        msg_Dbg( p_demux, "autodetecting subtitle format" );
        for( i_try = 0; i_try < 256; i_try++ )
        {
            int i_dummy;

            if( ( s = stream_ReadLine( p_demux->s ) ) == NULL )
                break;

            if( strcasestr( s, "<SAMI>" ) )
            {
                p_sys->i_type = SUB_TYPE_SAMI;
                break;
            }
            else if( sscanf( s, "{%d}{%d}", &i_dummy, &i_dummy ) == 2 ||
                     sscanf( s, "{%d}{}", &i_dummy ) == 1)
            {
                p_sys->i_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 )
            {
                p_sys->i_type = SUB_TYPE_SUBRIP;
                break;
            }
            else if( !strncasecmp( s, "!: This is a Sub Station Alpha v1", 33 ) )
            {
                p_sys->i_type = SUB_TYPE_SSA1;
                break;
            }
            else if( !strncasecmp( s, "ScriptType: v4.00+", 18 ) )
            {
                p_sys->i_type = SUB_TYPE_ASS;
                break;
            }
            else if( !strncasecmp( s, "ScriptType: v4.00", 17 ) )
            {
                p_sys->i_type = SUB_TYPE_SSA2_4;
                break;
            }
            else if( !strncasecmp( s, "Dialogue: Marked", 16  ) )
            {
                p_sys->i_type = SUB_TYPE_SSA2_4;
                break;
            }
            else if( !strncasecmp( s, "Dialogue:", 9  ) )
            {
                p_sys->i_type = SUB_TYPE_ASS;
                break;
            }
            else if( strcasestr( s, "[INFORMATION]" ) )
            {
                p_sys->i_type = SUB_TYPE_SUBVIEWER; /* I hope this will work */
                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 )
            {
                p_sys->i_type = SUB_TYPE_VPLAYER;
                break;
            }

            free( s );
            s = NULL;
        }

        if( s ) free( s );

        /* It will nearly always work even for non seekable stream thanks the
         * caching system, and if it fails we loose just a few sub */
        if( stream_Seek( p_demux->s, 0 ) )
        {
            msg_Warn( p_demux, "failed to rewind" );
        }
    }
    if( p_sys->i_type == SUB_TYPE_UNKNOWN )
    {
        msg_Err( p_demux, "failed to recognize subtitle type" );
        return VLC_EGENERIC;
    }

    for( i = 0; ; i++ )
    {
        if( sub_read_subtitle_function[i].i_type == p_sys->i_type )
        {
            msg_Dbg( p_demux, "detected %s format",
                     sub_read_subtitle_function[i].psz_name );
            pf_read = sub_read_subtitle_function[i].pf_read;
            break;
        }
    }

    msg_Dbg( p_demux, "loading all subtitles..." );

    /* Load the whole file */
    TextLoad( &p_sys->txt, p_demux->s );

    /* Parse it */
    for( i_max = 0;; )
    {
        if( p_sys->i_subtitles >= i_max )
        {
            i_max += 500;
            if( !( p_sys->subtitle = realloc( p_sys->subtitle,
                                              sizeof(subtitle_t) * i_max ) ) )
            {
                msg_Err( p_demux, "out of memory");
                return VLC_ENOMEM;
            }
        }

        if( pf_read( p_demux, &p_sys->subtitle[p_sys->i_subtitles] ) )
            break;

        p_sys->i_subtitles++;
    }
    /* Unload */
    TextUnload( &p_sys->txt );

    msg_Dbg(p_demux, "loaded %d subtitles", p_sys->i_subtitles );

    /* Fix subtitle (order and time) *** */
    p_sys->i_subtitle = 0;
    p_sys->i_length = 0;
    if( p_sys->i_subtitles > 0 )
    {
        p_sys->i_length = p_sys->subtitle[p_sys->i_subtitles-1].i_stop;
        /* +1 to avoid 0 */
        if( p_sys->i_length <= 0 )
            p_sys->i_length = p_sys->subtitle[p_sys->i_subtitles-1].i_start+1;
    }

    /* *** add subtitle ES *** */
    if( p_sys->i_type == SUB_TYPE_SSA1 ||
             p_sys->i_type == SUB_TYPE_SSA2_4 ||
             p_sys->i_type == SUB_TYPE_ASS )
    {
        es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','s','a',' ' ) );
    }
    else
    {
        es_format_Init( &fmt, SPU_ES, VLC_FOURCC( 's','u','b','t' ) );
    }
    if( p_sys->psz_header != NULL )
    {
        fmt.i_extra = strlen( p_sys->psz_header ) + 1;
        fmt.p_extra = strdup( p_sys->psz_header );
    }
    p_sys->es = es_out_Add( p_demux->out, &fmt );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: Close subtitle demux
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{