git.sesse.net Git - vlc/blob - modules/codec/subtitles/subsdec.c

   1 /*****************************************************************************
   2  * subsdec.c : text subtitles decoder
   3  *****************************************************************************
   4  * Copyright (C) 2000-2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *          Derk-Jan Hartman <hartman at videolan dot org>
  10  *          Bernie Purcell <bitmap@videolan.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include "subsdec.h"
  35 #include <vlc_plugin.h>
  36
  37 /*****************************************************************************
  38  * Local prototypes
  39  *****************************************************************************/
  40 static int  OpenDecoder   ( vlc_object_t * );
  41 static void CloseDecoder  ( vlc_object_t * );
  42
  43 static subpicture_t   *DecodeBlock   ( decoder_t *, block_t ** );
  44 static subpicture_t   *ParseText     ( decoder_t *, block_t * );
  45 static char           *StripTags      ( char * );
  46 static char           *CreateHtmlSubtitle( int *pi_align, char * );
  47
  48
  49 /*****************************************************************************
  50  * Module descriptor.
  51  *****************************************************************************/
  52 static const char *const ppsz_encodings[] = {
  53     DEFAULT_NAME, "ASCII", "UTF-8", "",
  54     "ISO-8859-1", "CP1252", "MacRoman", "MacIceland","ISO-8859-15", "",
  55     "ISO-8859-2", "CP1250", "MacCentralEurope", "MacCroatian", "MacRomania", "",
  56     "ISO-8859-5", "CP1251", "MacCyrillic", "MacUkraine", "KOI8-R", "KOI8-U", "KOI8-RU", "",
  57     "ISO-8859-6", "CP1256", "MacArabic", "",
  58     "ISO-8859-7", "CP1253", "MacGreek", "",
  59     "ISO-8859-8", "CP1255", "MacHebrew", "",
  60     "ISO-8859-9", "CP1254", "MacTurkish", "",
  61     "ISO-8859-13", "CP1257", "",
  62     "ISO-2022-JP", "ISO-2022-JP-1", "ISO-2022-JP-2", "EUC-JP", "SHIFT_JIS", "",
  63     "ISO-2022-CN", "ISO-2022-CN-EXT", "EUC-CN", "EUC-TW", "BIG5", "BIG5-HKSCS", "",
  64     "ISO-2022-KR", "EUC-KR", "",
  65     "MacThai", "KOI8-T", "",
  66     "ISO-8859-3", "ISO-8859-4", "ISO-8859-10", "ISO-8859-14", "ISO-8859-16", "",
  67     "CP850", "CP862", "CP866", "CP874", "CP932", "CP949", "CP950", "CP1133", "CP1258", "",
  68     "Macintosh", "",
  69     "UTF-7", "UTF-16", "UTF-16BE", "UTF-16LE", "UTF-32", "UTF-32BE", "UTF-32LE",
  70     "C99", "JAVA", "UCS-2", "UCS-2BE", "UCS-2LE", "UCS-4", "UCS-4BE", "UCS-4LE", "",
  71     "HZ", "GBK", "GB18030", "JOHAB", "ARMSCII-8",
  72     "Georgian-Academy", "Georgian-PS", "TIS-620", "MuleLao-1", "VISCII", "TCVN",
  73     "HPROMAN8", "NEXTSTEP" };
  74 /*
  75 SSA supports charset selection.
  76 The following known charsets are used:
  77
  78 0 = Ansi - Western European
  79 1 = default
  80 2 = symbol
  81 3 = invalid
  82 77 = Mac
  83 128 = Japanese (Shift JIS)
  84 129 = Hangul
  85 130 = Johab
  86 134 = GB2312 Simplified Chinese
  87 136 = Big5 Traditional Chinese
  88 161 = Greek
  89 162 = Turkish
  90 163 = Vietnamese
  91 177 = Hebrew
  92 178 = Arabic
  93 186 = Baltic
  94 204 = Russian (Cyrillic)
  95 222 = Thai
  96 238 = Eastern European
  97 254 = PC 437
  98 */
  99
 100 static const int  pi_justification[] = { 0, 1, 2 };
 101 static const char *const ppsz_justification_text[] = {
 102     N_("Center"),N_("Left"),N_("Right")};
 103
 104 #define ENCODING_TEXT N_("Subtitles text encoding")
 105 #define ENCODING_LONGTEXT N_("Set the encoding used in text subtitles")
 106 #define ALIGN_TEXT N_("Subtitles justification")
 107 #define ALIGN_LONGTEXT N_("Set the justification of subtitles")
 108 #define AUTODETECT_UTF8_TEXT N_("UTF-8 subtitles autodetection")
 109 #define AUTODETECT_UTF8_LONGTEXT N_("This enables automatic detection of " \
 110             "UTF-8 encoding within subtitles files.")
 111 #define FORMAT_TEXT N_("Formatted Subtitles")
 112 #define FORMAT_LONGTEXT N_("Some subtitle formats allow for text formatting. " \
 113  "VLC partly implements this, but you can choose to disable all formatting.")
 114
 115
 116 vlc_module_begin();
 117     set_shortname( N_("Subtitles"));
 118     set_description( N_("Text subtitles decoder") );
 119     set_capability( "decoder", 50 );
 120     set_callbacks( OpenDecoder, CloseDecoder );
 121     set_category( CAT_INPUT );
 122     set_subcategory( SUBCAT_INPUT_SCODEC );
 123
 124     add_integer( "subsdec-align", 0, NULL, ALIGN_TEXT, ALIGN_LONGTEXT,
 125                  false );
 126         change_integer_list( pi_justification, ppsz_justification_text, NULL );
 127     add_string( "subsdec-encoding", DEFAULT_NAME, NULL,
 128                 ENCODING_TEXT, ENCODING_LONGTEXT, false );
 129         change_string_list( ppsz_encodings, 0, 0 );
 130     add_bool( "subsdec-autodetect-utf8", true, NULL,
 131               AUTODETECT_UTF8_TEXT, AUTODETECT_UTF8_LONGTEXT, false );
 132     add_bool( "subsdec-formatted", true, NULL, FORMAT_TEXT, FORMAT_LONGTEXT,
 133                  false );
 134 vlc_module_end();
 135
 136 /*****************************************************************************
 137  * OpenDecoder: probe the decoder and return score
 138  *****************************************************************************
 139  * Tries to launch a decoder and return score so that the interface is able
 140  * to chose.
 141  *****************************************************************************/
 142 static int OpenDecoder( vlc_object_t *p_this )
 143 {
 144     decoder_t     *p_dec = (decoder_t*)p_this;
 145     decoder_sys_t *p_sys;
 146     vlc_value_t    val;
 147
 148     switch( p_dec->fmt_in.i_codec )
 149     {
 150         case VLC_FOURCC('s','u','b','t'):
 151         case VLC_FOURCC('s','s','a',' '):
 152         case VLC_FOURCC('t','1','4','0'):
 153             break;
 154         default:
 155             return VLC_EGENERIC;
 156     }
 157
 158     p_dec->pf_decode_sub = DecodeBlock;
 159
 160     /* Allocate the memory needed to store the decoder's structure */
 161     p_dec->p_sys = p_sys = malloc( sizeof( *p_sys ) );
 162     if( p_sys == NULL )
 163         return VLC_ENOMEM;
 164
 165     /* init of p_sys */
 166     memset( p_sys, 0, sizeof( *p_sys ) );
 167     p_sys->i_align = 0;
 168     p_sys->iconv_handle = (vlc_iconv_t)-1;
 169     p_sys->b_autodetect_utf8 = false;
 170     p_sys->b_ass = false;
 171     p_sys->i_original_height = -1;
 172     p_sys->i_original_width = -1;
 173     TAB_INIT( p_sys->i_ssa_styles, p_sys->pp_ssa_styles );
 174     TAB_INIT( p_sys->i_images, p_sys->pp_images );
 175
 176     char *psz_charset = NULL;
 177
 178     /* First try demux-specified encoding */
 179     if( p_dec->fmt_in.i_codec == VLC_FOURCC('t','1','4','0') )
 180         psz_charset = strdup( "UTF-8" ); /* IUT T.140 is always using UTF-8 */
 181     else
 182     if( p_dec->fmt_in.subs.psz_encoding && *p_dec->fmt_in.subs.psz_encoding )
 183     {
 184         psz_charset = strdup (p_dec->fmt_in.subs.psz_encoding);
 185         msg_Dbg (p_dec, "trying demuxer-specified character encoding: %s",
 186                  p_dec->fmt_in.subs.psz_encoding ?: "not specified");
 187     }
 188
 189     /* Second, try configured encoding */
 190     if (psz_charset == NULL)
 191     {
 192         psz_charset = var_CreateGetNonEmptyString (p_dec, "subsdec-encoding");
 193         if ((psz_charset != NULL) && !strcasecmp (psz_charset, DEFAULT_NAME))
 194         {
 195             free (psz_charset);
 196             psz_charset = NULL;
 197         }
 198
 199         msg_Dbg (p_dec, "trying configured character encoding: %s",
 200                  psz_charset ?: "not specified");
 201     }
 202
 203     /* Third, try "local" encoding with optional UTF-8 autodetection */
 204     if (psz_charset == NULL)
 205     {
 206         psz_charset = strdup (GetFallbackEncoding ());
 207         msg_Dbg (p_dec, "trying default character encoding: %s",
 208                  psz_charset ?: "not specified");
 209
 210         if (var_CreateGetBool (p_dec, "subsdec-autodetect-utf8"))
 211         {
 212             msg_Dbg (p_dec, "using automatic UTF-8 detection");
 213             p_sys->b_autodetect_utf8 = true;
 214         }
 215     }
 216
 217     /* Forth, don't do character decoding, i.e. assume UTF-8 */
 218     if (psz_charset == NULL)
 219     {
 220         psz_charset = strdup ("UTF-8");
 221         msg_Dbg (p_dec, "using UTF-8 character encoding" );
 222     }
 223
 224     if ((psz_charset != NULL)
 225      && strcasecmp (psz_charset, "UTF-8")
 226      && strcasecmp (psz_charset, "utf8"))
 227     {
 228         p_sys->iconv_handle = vlc_iconv_open ("UTF-8", psz_charset);
 229         if (p_sys->iconv_handle == (vlc_iconv_t)(-1))
 230             msg_Err (p_dec, "cannot convert from %s: %m", psz_charset);
 231     }
 232     free (psz_charset);
 233
 234     var_Create( p_dec, "subsdec-align", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 235     var_Get( p_dec, "subsdec-align", &val );
 236     p_sys->i_align = val.i_int;
 237
 238     if( p_dec->fmt_in.i_codec == VLC_FOURCC('s','s','a',' ')
 239      && var_CreateGetBool( p_dec, "subsdec-formatted" ) )
 240     {
 241         if( p_dec->fmt_in.i_extra > 0 )
 242             ParseSSAHeader( p_dec );
 243     }
 244
 245     return VLC_SUCCESS;
 246 }
 247
 248 /****************************************************************************
 249  * DecodeBlock: the whole thing
 250  ****************************************************************************
 251  * This function must be fed with complete subtitles units.
 252  ****************************************************************************/
 253 static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 254 {
 255     subpicture_t *p_spu;
 256     block_t *p_block;
 257
 258     if( !pp_block || *pp_block == NULL )
 259         return NULL;
 260
 261     p_block = *pp_block;
 262     if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
 263     {
 264         block_Release( p_block );
 265         return NULL;
 266     }
 267     if( p_block->i_rate != 0 )
 268         p_block->i_length = p_block->i_length * p_block->i_rate / INPUT_RATE_DEFAULT;
 269
 270     p_spu = ParseText( p_dec, p_block );
 271
 272     block_Release( p_block );
 273     *pp_block = NULL;
 274
 275     return p_spu;
 276 }
 277
 278 /*****************************************************************************
 279  * CloseDecoder: clean up the decoder
 280  *****************************************************************************/
 281 static void CloseDecoder( vlc_object_t *p_this )
 282 {
 283     decoder_t *p_dec = (decoder_t *)p_this;
 284     decoder_sys_t *p_sys = p_dec->p_sys;
 285
 286     if( p_sys->iconv_handle != (vlc_iconv_t)-1 )
 287         vlc_iconv_close( p_sys->iconv_handle );
 288
 289     if( p_sys->pp_ssa_styles )
 290     {
 291         int i;
 292         for( i = 0; i < p_sys->i_ssa_styles; i++ )
 293         {
 294             if( !p_sys->pp_ssa_styles[i] )
 295                 continue;
 296
 297             free( p_sys->pp_ssa_styles[i]->psz_stylename );
 298             free( p_sys->pp_ssa_styles[i]->font_style.psz_fontname );
 299             free( p_sys->pp_ssa_styles[i] );
 300         }
 301         TAB_CLEAN( p_sys->i_ssa_styles, p_sys->pp_ssa_styles );
 302     }
 303     if( p_sys->pp_images )
 304     {
 305         int i;
 306         for( i = 0; i < p_sys->i_images; i++ )
 307         {
 308             if( !p_sys->pp_images[i] )
 309                 continue;
 310
 311             if( p_sys->pp_images[i]->p_pic )
 312                 picture_Release( p_sys->pp_images[i]->p_pic );
 313             free( p_sys->pp_images[i]->psz_filename );
 314
 315             free( p_sys->pp_images[i] );
 316         }
 317         TAB_CLEAN( p_sys->i_images, p_sys->pp_images );
 318     }
 319
 320     free( p_sys );
 321 }
 322
 323 /*****************************************************************************
 324  * ParseText: parse an text subtitle packet and send it to the video output
 325  *****************************************************************************/
 326 static subpicture_t *ParseText( decoder_t *p_dec, block_t *p_block )
 327 {
 328     decoder_sys_t *p_sys = p_dec->p_sys;
 329     subpicture_t *p_spu = NULL;
 330     char *psz_subtitle = NULL;
 331     video_format_t fmt;
 332
 333     /* We cannot display a subpicture with no date */
 334     if( p_block->i_pts == 0 )
 335     {
 336         msg_Warn( p_dec, "subtitle without a date" );
 337         return NULL;
 338     }
 339
 340     /* Check validity of packet data */
 341     /* An "empty" line containing only \0 can be used to force
 342        and ephemer picture from the screen */
 343     if( p_block->i_buffer < 1 )
 344     {
 345         msg_Warn( p_dec, "no subtitle data" );
 346         return NULL;
 347     }
 348
 349     /* Should be resiliant against bad subtitles */
 350     psz_subtitle = strndup( (const char *)p_block->p_buffer,
 351                             p_block->i_buffer );
 352     if( psz_subtitle == NULL )
 353         return NULL;
 354
 355     if( p_sys->iconv_handle == (vlc_iconv_t)-1 )
 356     {
 357         if (EnsureUTF8( psz_subtitle ) == NULL)
 358         {
 359             msg_Err( p_dec, "failed to convert subtitle encoding.\n"
 360                      "Try manually setting a character-encoding "
 361                      "before you open the file." );
 362         }
 363     }
 364     else
 365     {
 366
 367         if( p_sys->b_autodetect_utf8 )
 368         {
 369             if( IsUTF8( psz_subtitle ) == NULL )
 370             {
 371                 msg_Dbg( p_dec, "invalid UTF-8 sequence: "
 372                          "disabling UTF-8 subtitles autodetection" );
 373                 p_sys->b_autodetect_utf8 = false;
 374             }
 375         }
 376
 377         if( !p_sys->b_autodetect_utf8 )
 378         {
 379             size_t inbytes_left = strlen( psz_subtitle );
 380             size_t outbytes_left = 6 * inbytes_left;
 381             char *psz_new_subtitle = malloc( outbytes_left + 1 );
 382             char *psz_convert_buffer_out = psz_new_subtitle;
 383             const char *psz_convert_buffer_in = psz_subtitle;
 384
 385             size_t ret = vlc_iconv( p_sys->iconv_handle,
 386                                     &psz_convert_buffer_in, &inbytes_left,
 387                                     &psz_convert_buffer_out, &outbytes_left );
 388
 389             *psz_convert_buffer_out++ = '\0';
 390             free( psz_subtitle );
 391
 392             if( ( ret == (size_t)(-1) ) || inbytes_left )
 393             {
 394                 free( psz_new_subtitle );
 395                 msg_Err( p_dec, "failed to convert subtitle encoding.\n"
 396                         "Try manually setting a character-encoding "
 397                                 "before you open the file." );
 398                 return NULL;
 399             }
 400
 401             psz_subtitle = realloc( psz_new_subtitle,
 402                                     psz_convert_buffer_out - psz_new_subtitle );
 403         }
 404     }
 405
 406     /* Create the subpicture unit */
 407     p_spu = p_dec->pf_spu_buffer_new( p_dec );
 408     if( !p_spu )
 409     {
 410         msg_Warn( p_dec, "can't get spu buffer" );
 411         free( psz_subtitle );
 412         return NULL;
 413     }
 414
 415     /* Create a new subpicture region */
 416     memset( &fmt, 0, sizeof(video_format_t) );
 417     fmt.i_chroma = VLC_FOURCC('T','E','X','T');
 418     fmt.i_aspect = 0;
 419     fmt.i_width = fmt.i_height = 0;
 420     fmt.i_x_offset = fmt.i_y_offset = 0;
 421     p_spu->p_region = subpicture_region_New( &fmt );
 422     if( !p_spu->p_region )
 423     {
 424         msg_Err( p_dec, "cannot allocate SPU region" );
 425         free( psz_subtitle );
 426         p_dec->pf_spu_buffer_del( p_dec, p_spu );
 427         return NULL;
 428     }
 429
 430     /* Decode and format the subpicture unit */
 431     if( p_dec->fmt_in.i_codec != VLC_FOURCC('s','s','a',' ') )
 432     {
 433         /* Normal text subs, easy markup */
 434         p_spu->p_region->i_align = SUBPICTURE_ALIGN_BOTTOM | p_sys->i_align;
 435         p_spu->p_region->i_x = p_sys->i_align ? 20 : 0;
 436         p_spu->p_region->i_y = 10;
 437
 438         /* Remove formatting from string */
 439
 440         p_spu->p_region->psz_text = StripTags( psz_subtitle );
 441         if( var_CreateGetBool( p_dec, "subsdec-formatted" ) )
 442         {
 443             p_spu->p_region->psz_html = CreateHtmlSubtitle( &p_spu->p_region->i_align, psz_subtitle );
 444         }
 445
 446         p_spu->i_start = p_block->i_pts;
 447         p_spu->i_stop = p_block->i_pts + p_block->i_length;
 448         p_spu->b_ephemer = (p_block->i_length == 0);
 449         p_spu->b_absolute = false;
 450     }
 451     else
 452     {
 453         /* Decode SSA/USF strings */
 454         ParseSSAString( p_dec, psz_subtitle, p_spu );
 455
 456         p_spu->i_start = p_block->i_pts;
 457         p_spu->i_stop = p_block->i_pts + p_block->i_length;
 458         p_spu->b_ephemer = (p_block->i_length == 0);
 459         p_spu->b_absolute = false;
 460         p_spu->i_original_picture_width = p_sys->i_original_width;
 461         p_spu->i_original_picture_height = p_sys->i_original_height;
 462     }
 463     free( psz_subtitle );
 464
 465     return p_spu;
 466 }
 467
 468 char* GotoNextLine( char *psz_text )
 469 {
 470     char *p_newline = psz_text;
 471
 472     while( p_newline[0] != '\0' )
 473     {
 474         if( p_newline[0] == '\n' || p_newline[0] == '\r' )
 475         {
 476             p_newline++;
 477             while( p_newline[0] == '\n' || p_newline[0] == '\r' )
 478                 p_newline++;
 479             break;
 480         }
 481         else p_newline++;
 482     }
 483     return p_newline;
 484 }
 485
 486 /* Function now handles tags with attribute values, and tries
 487  * to deal with &' commands too. It no longer modifies the string
 488  * in place, so that the original text can be reused
 489  */
 490 static char *StripTags( char *psz_subtitle )
 491 {
 492     char *psz_text_start;
 493     char *psz_text;
 494
 495     psz_text = psz_text_start = malloc( strlen( psz_subtitle ) + 1 );
 496     if( !psz_text_start )
 497         return NULL;
 498
 499     while( *psz_subtitle )
 500     {
 501         if( *psz_subtitle == '<' )
 502         {
 503             if( strncasecmp( psz_subtitle, "<br/>", 5 ) == 0 )
 504                 *psz_text++ = '\n';
 505
 506             psz_subtitle += strcspn( psz_subtitle, ">" );
 507         }
 508         else if( *psz_subtitle == '&' )
 509         {
 510             if( !strncasecmp( psz_subtitle, "&lt;", 4 ))
 511             {
 512                 *psz_text++ = '<';
 513                 psz_subtitle += strcspn( psz_subtitle, ";" );
 514             }
 515             else if( !strncasecmp( psz_subtitle, "&gt;", 4 ))
 516             {
 517                 *psz_text++ = '>';
 518                 psz_subtitle += strcspn( psz_subtitle, ";" );
 519             }
 520             else if( !strncasecmp( psz_subtitle, "&amp;", 5 ))
 521             {
 522                 *psz_text++ = '&';
 523                 psz_subtitle += strcspn( psz_subtitle, ";" );
 524             }
 525             else if( !strncasecmp( psz_subtitle, "&quot;", 6 ))
 526             {
 527                 *psz_text++ = '\"';
 528                 psz_subtitle += strcspn( psz_subtitle, ";" );
 529             }
 530             else
 531             {
 532                 /* Assume it is just a normal ampersand */
 533                 *psz_text++ = '&';
 534             }
 535         }
 536         else
 537         {
 538             *psz_text++ = *psz_subtitle;
 539         }
 540
 541         psz_subtitle++;
 542     }
 543     *psz_text = '\0';
 544     psz_text_start = realloc( psz_text_start, strlen( psz_text_start ) + 1 );
 545
 546     return psz_text_start;
 547 }
 548
 549 /* Try to respect any style tags present in the subtitle string. The main
 550  * problem here is a lack of adequate specs for the subtitle formats.
 551  * SSA/ASS and USF are both detail spec'ed -- but they are handled elsewhere.
 552  * SAMI has a detailed spec, but extensive rework is needed in the demux
 553  * code to prevent all this style information being excised, as it presently
 554  * does.
 555  * That leaves the others - none of which were (I guess) originally intended
 556  * to be carrying style information. Over time people have used them that way.
 557  * In the absence of specifications from which to work, the tags supported
 558  * have been restricted to the simple set permitted by the USF DTD, ie. :
 559  *  Basic: <br>, <i>, <b>, <u>
 560  *  Extended: <font>
 561  *    Attributes: face
 562  *                family
 563  *                size
 564  *                color
 565  *                outline-color
 566  *                shadow-color
 567  *                outline-level
 568  *                shadow-level
 569  *                back-color
 570  *                alpha
 571  * There is also the further restriction that the subtitle be well-formed
 572  * as an XML entity, ie. the HTML sentence:
 573  *        <b><i>Bold and Italics</b></i>
 574  * doesn't qualify because the tags aren't nested one inside the other.
 575  * <text> tags are automatically added to the output to ensure
 576  * well-formedness.
 577  * If the text doesn't qualify for any reason, a NULL string is
 578  * returned, and the rendering engine will fall back to the
 579  * plain text version of the subtitle.
 580  */
 581 static void HtmlNPut( char **ppsz_html, const char *psz_text, int i_max )
 582 {
 583     const int i_len = strlen(psz_text);
 584
 585     strncpy( *ppsz_html, psz_text, i_max );
 586     *ppsz_html += __MIN(i_max,i_len);
 587 }
 588
 589 static void HtmlPut( char **ppsz_html, const char *psz_text )
 590 {
 591     strcpy( *ppsz_html, psz_text );
 592     *ppsz_html += strlen(psz_text);
 593 }
 594 static void HtmlCopy( char **ppsz_html, char **ppsz_subtitle, const char *psz_text )
 595 {
 596     HtmlPut( ppsz_html, psz_text );
 597     *ppsz_subtitle += strlen(psz_text);
 598 }
 599
 600 static char *CreateHtmlSubtitle( int *pi_align, char *psz_subtitle )
 601 {
 602     char   *psz_tag = malloc( ( strlen( psz_subtitle ) / 3 ) + 1 );
 603     if( !psz_tag ) return NULL;
 604     size_t  i_buf_size     = strlen( psz_subtitle ) + 100;
 605     char   *psz_html_start = malloc( i_buf_size );
 606     bool b_has_align = false;
 607
 608     psz_tag[ 0 ] = '\0';
 609
 610     if( psz_html_start == NULL )
 611     {
 612         free( psz_tag );
 613         return NULL;
 614     }
 615
 616     char *psz_html = psz_html_start;
 617
 618     strcpy( psz_html, "<text>" );
 619     psz_html += 6;
 620
 621     /* */
 622     while( *psz_subtitle )
 623     {
 624         if( *psz_subtitle == '\n' )
 625         {
 626             HtmlPut( &psz_html, "<br/>" );
 627             psz_subtitle++;
 628         }
 629         else if( *psz_subtitle == '<' )
 630         {
 631             if( !strncasecmp( psz_subtitle, "<br/>", 5 ))
 632             {
 633                 HtmlCopy( &psz_html, &psz_subtitle, "<br/>" );
 634             }
 635             else if( !strncasecmp( psz_subtitle, "<b>", 3 ) )
 636             {
 637                 HtmlCopy( &psz_html, &psz_subtitle, "<b>" );
 638                 strcat( psz_tag, "b" );
 639             }
 640             else if( !strncasecmp( psz_subtitle, "<i>", 3 ) )
 641             {
 642                 HtmlCopy( &psz_html, &psz_subtitle, "<i>" );
 643                 strcat( psz_tag, "i" );
 644             }
 645             else if( !strncasecmp( psz_subtitle, "<u>", 3 ) )
 646             {
 647                 HtmlCopy( &psz_html, &psz_subtitle, "<u>" );
 648                 strcat( psz_tag, "u" );
 649             }
 650             else if( !strncasecmp( psz_subtitle, "<font ", 6 ))
 651             {
 652                 const char *psz_attribs[] = { "face=", "family=", "size=",
 653                         "color=", "outline-color=", "shadow-color=",
 654                         "outline-level=", "shadow-level=", "back-color=",
 655                         "alpha=", NULL };
 656
 657                 HtmlCopy( &psz_html, &psz_subtitle, "<font " );
 658                 strcat( psz_tag, "f" );
 659
 660                 while( *psz_subtitle != '>' )
 661                 {
 662                     int  k;
 663
 664                     for( k=0; psz_attribs[ k ]; k++ )
 665                     {
 666                         int i_len = strlen( psz_attribs[ k ] );
 667
 668                         if( !strncasecmp( psz_subtitle, psz_attribs[k], i_len ) )
 669                         {
 670                             /* */
 671                             HtmlPut( &psz_html, psz_attribs[k] );
 672                             psz_subtitle += i_len;
 673
 674                             /* */
 675                             if( *psz_subtitle == '"' )
 676                             {
 677                                 psz_subtitle++;
 678                                 i_len = strcspn( psz_subtitle, "\"" );
 679                             }
 680                             else
 681                             {
 682                                 i_len = strcspn( psz_subtitle, " \t>" );
 683                             }
 684                             HtmlPut( &psz_html, "\"" );
 685                             if( !strcmp( psz_attribs[ k ], "color=" ) && *psz_subtitle >= '0' && *psz_subtitle <= '9' )
 686                                 HtmlPut( &psz_html, "#" );
 687                             HtmlNPut( &psz_html, psz_subtitle, i_len );
 688                             HtmlPut( &psz_html, "\"" );
 689
 690                             psz_subtitle += i_len;
 691                             if( *psz_subtitle == '\"' )
 692                                 psz_subtitle++;
 693                             break;
 694                         }
 695                     }
 696                     if( psz_attribs[ k ] == NULL )
 697                     {
 698                         /* Jump over unrecognised tag */
 699                         int i_len = strcspn( psz_subtitle, "\"" ) + 1;
 700
 701                         i_len += strcspn( psz_subtitle + i_len, "\"" ) + 1;
 702                         psz_subtitle += i_len;
 703                     }
 704                     while (*psz_subtitle == ' ')
 705                         *psz_html++ = *psz_subtitle++;
 706                 }
 707                 *psz_html++ = *psz_subtitle++;
 708             }
 709             else if( !strncmp( psz_subtitle, "</", 2 ))
 710             {
 711                 bool   b_match     = false;
 712                 bool   b_ignore    = false;
 713                 int    i_len       = strlen( psz_tag ) - 1;
 714                 char  *psz_lastTag = NULL;
 715
 716                 if( i_len >= 0 )
 717                 {
 718                     psz_lastTag = psz_tag + i_len;
 719                     i_len = 0;
 720
 721                     switch( *psz_lastTag )
 722                     {
 723                     case 'b':
 724                         b_match = !strncasecmp( psz_subtitle, "</b>", 4 );
 725                         i_len   = 4;
 726                         break;
 727                     case 'i':
 728                         b_match = !strncasecmp( psz_subtitle, "</i>", 4 );
 729                         i_len   = 4;
 730                         break;
 731                     case 'u':
 732                         b_match = !strncasecmp( psz_subtitle, "</u>", 4 );
 733                         i_len   = 4;
 734                         break;
 735                     case 'f':
 736                         b_match = !strncasecmp( psz_subtitle, "</font>", 7 );
 737                         i_len   = 7;
 738                         break;
 739                     case 'I':
 740                         i_len = strcspn( psz_subtitle, ">" );
 741                         b_match = psz_subtitle[i_len] == '>';
 742                         b_ignore = true;
 743                         if( b_match )
 744                             i_len++;
 745                         break;
 746                     }
 747                 }
 748                 if( !b_match )
 749                 {
 750                     /* Not well formed -- kill everything */
 751                     free( psz_html_start );
 752                     psz_html_start = NULL;
 753                     break;
 754                 }
 755                 *psz_lastTag = '\0';
 756                 if( !b_ignore )
 757                     HtmlNPut( &psz_html, psz_subtitle, i_len );
 758
 759                 psz_subtitle += i_len;
 760             }
 761             else if( ( psz_subtitle[1] < 'a' || psz_subtitle[1] > 'z' ) &&
 762                      ( psz_subtitle[1] < 'A' || psz_subtitle[1] > 'Z' ) )
 763             {
 764                 /* We have a single < */
 765                 HtmlPut( &psz_html, "&lt;" );
 766                 psz_subtitle++;
 767             }
 768             else
 769             {
 770                 /* We have an unknown tag or a single < */
 771
 772                 /* Search for the next tag or end of tag or end of string */
 773                 char *psz_stop = psz_subtitle + 1 + strcspn( &psz_subtitle[1], "<>" );
 774                 char *psz_closing = strstr( psz_subtitle, "/>" );
 775
 776                 if( psz_closing && psz_closing < psz_stop )
 777                 {
 778                     /* We have a self closed tag, remove it */
 779                     psz_subtitle = &psz_closing[2];
 780                 }
 781                 else if( *psz_stop == '>' )
 782                 {
 783                     char psz_match[256];
 784
 785                     snprintf( psz_match, sizeof(psz_match), "</%s", &psz_subtitle[1] );
 786                     psz_match[strcspn( psz_match, " \t>" )] = '\0';
 787
 788                     if( strstr( psz_subtitle, psz_match ) )
 789                     {
 790                         /* We have the closing tag, ignore it TODO */
 791                         psz_subtitle = &psz_stop[1];
 792                         strcat( psz_tag, "I" );
 793                     }
 794                     else
 795                     {
 796                         int i_len = psz_stop + 1 - psz_subtitle;
 797
 798                         /* Copy the whole data */
 799                         for( ; i_len > 0; i_len--, psz_subtitle++ )
 800                         {
 801                             if( *psz_subtitle == '<' )
 802                                 HtmlPut( &psz_html, "&lt;" );
 803                             else if( *psz_subtitle == '>' )
 804                                 HtmlPut( &psz_html, "&gt;" );
 805                             else
 806                                 *psz_html++ = *psz_subtitle;
 807                         }
 808                     }
 809                 }
 810                 else
 811                 {
 812                     /* We have a single < */
 813                     HtmlPut( &psz_html, "&lt;" );
 814                     psz_subtitle++;
 815                 }
 816             }
 817         }
 818         else if( *psz_subtitle == '&' )
 819         {
 820             if( !strncasecmp( psz_subtitle, "&lt;", 4 ))
 821             {
 822                 HtmlCopy( &psz_html, &psz_subtitle, "&lt;" );
 823             }
 824             else if( !strncasecmp( psz_subtitle, "&gt;", 4 ))
 825             {
 826                 HtmlCopy( &psz_html, &psz_subtitle, "&gt;" );
 827             }
 828             else if( !strncasecmp( psz_subtitle, "&amp;", 5 ))
 829             {
 830                 HtmlCopy( &psz_html, &psz_subtitle, "&amp;" );
 831             }
 832             else
 833             {
 834                 HtmlPut( &psz_html, "&amp;" );
 835                 psz_subtitle++;
 836             }
 837         }
 838         else if( *psz_subtitle == '>' )
 839         {
 840             HtmlPut( &psz_html, "&gt;" );
 841             psz_subtitle++;
 842         }
 843         else if( psz_subtitle[0] == '{' && psz_subtitle[1] == '\\' &&
 844                  strchr( psz_subtitle, '}' ) )
 845         {
 846             /* Check for forced alignment */
 847             if( !b_has_align &&
 848                 !strncmp( psz_subtitle, "{\\an", 4 ) && psz_subtitle[4] >= '1' && psz_subtitle[4] <= '9' && psz_subtitle[5] == '}' )
 849             {
 850                 static const int pi_vertical[3] = { SUBPICTURE_ALIGN_BOTTOM, 0, SUBPICTURE_ALIGN_TOP };
 851                 static const int pi_horizontal[3] = { SUBPICTURE_ALIGN_LEFT, 0, SUBPICTURE_ALIGN_RIGHT };
 852                 const int i_id = psz_subtitle[4] - '1';
 853
 854                 b_has_align = true;
 855                 *pi_align = pi_vertical[i_id/3] | pi_horizontal[i_id%3];
 856             }
 857             /* TODO fr -> rotation */
 858
 859             /* Hide {\stupidity} */
 860             psz_subtitle = strchr( psz_subtitle, '}' ) + 1;
 861         }
 862         else
 863         {
 864             *psz_html = *psz_subtitle;
 865             if( psz_html > psz_html_start )
 866             {
 867                 /* Check for double whitespace */
 868                 if( ( *psz_html == ' '  || *psz_html == '\t' ) &&
 869                     ( *(psz_html-1) == ' ' || *(psz_html-1) == '\t' ) )
 870                 {
 871                     HtmlPut( &psz_html, NO_BREAKING_SPACE );
 872                     psz_html--;
 873                 }
 874             }
 875             psz_html++;
 876             psz_subtitle++;
 877         }
 878
 879         if( ( size_t )( psz_html - psz_html_start ) > i_buf_size - 50 )
 880         {
 881             int i_len = psz_html - psz_html_start;
 882
 883             i_buf_size += 200;
 884             psz_html_start = realloc( psz_html_start, i_buf_size );
 885             psz_html = psz_html_start + i_len;
 886             *psz_html = '\0';
 887         }
 888     }
 889     strcpy( psz_html, "</text>" );
 890     psz_html += 7;
 891
 892     if( psz_tag[ 0 ] != '\0' )
 893     {
 894         /* Not well formed -- kill everything */
 895         free( psz_html_start );
 896         psz_html_start = NULL;
 897     }
 898     else if( psz_html_start )
 899     {
 900         /* Shrink the memory requirements */
 901         psz_html_start = realloc( psz_html_start,  psz_html - psz_html_start + 1 );
 902     }
 903     free( psz_tag );
 904
 905     return psz_html_start;
 906 }
 907