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

   1 /*****************************************************************************
   2  * subsusf.c : USF subtitles decoder
   3  *****************************************************************************
   4  * Copyright (C) 2000-2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Bernie Purcell <bitmap@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23 #ifdef HAVE_CONFIG_H
  24 # include "config.h"
  25 #endif
  26
  27 #include "subsdec.h"
  28 #include <vlc_plugin.h>
  29
  30 /*****************************************************************************
  31  * Local prototypes
  32  *****************************************************************************/
  33 static int  OpenDecoder   ( vlc_object_t * );
  34 static void CloseDecoder  ( vlc_object_t * );
  35
  36 static subpicture_t *DecodeBlock   ( decoder_t *, block_t ** );
  37 static char         *CreatePlainText( char * );
  38 static int           ParseImageAttachments( decoder_t *p_dec );
  39
  40 static subpicture_t        *ParseText     ( decoder_t *, block_t * );
  41 static void                 ParseUSFHeader( decoder_t * );
  42 static subpicture_region_t *ParseUSFString( decoder_t *, char *, subpicture_t * );
  43 static subpicture_region_t *LoadEmbeddedImage( decoder_t *p_dec, subpicture_t *p_spu, const char *psz_filename, int i_transparent_color );
  44
  45 /*****************************************************************************
  46  * Module descriptor.
  47  *****************************************************************************/
  48
  49 vlc_module_begin();
  50     set_capability( "decoder", 40 );
  51     set_shortname( N_("USFSubs"));
  52     set_description( N_("USF subtitles decoder") );
  53     set_callbacks( OpenDecoder, CloseDecoder );
  54     set_category( CAT_INPUT );
  55     set_subcategory( SUBCAT_INPUT_SCODEC );
  56     /* We inherit subsdec-align and subsdec-formatted from subsdec.c */
  57 vlc_module_end();
  58
  59 /*****************************************************************************
  60  * OpenDecoder: probe the decoder and return score
  61  *****************************************************************************
  62  * Tries to launch a decoder and return score so that the interface is able
  63  * to chose.
  64  *****************************************************************************/
  65 static int OpenDecoder( vlc_object_t *p_this )
  66 {
  67     decoder_t     *p_dec = (decoder_t*)p_this;
  68     decoder_sys_t *p_sys;
  69     vlc_value_t    val;
  70
  71     if( p_dec->fmt_in.i_codec != VLC_FOURCC('u','s','f',' ') )
  72     {
  73         return VLC_EGENERIC;
  74     }
  75
  76     p_dec->pf_decode_sub = DecodeBlock;
  77
  78     /* Allocate the memory needed to store the decoder's structure */
  79     if( ( p_dec->p_sys = p_sys =
  80           (decoder_sys_t *)calloc(1, sizeof(decoder_sys_t)) ) == NULL )
  81     {
  82         return VLC_ENOMEM;
  83     }
  84
  85     /* Unused fields of p_sys - not needed for USF decoding */
  86     p_sys->b_ass = false;
  87     p_sys->iconv_handle = (vlc_iconv_t)-1;
  88     p_sys->b_autodetect_utf8 = false;
  89
  90     /* init of p_sys */
  91     p_sys->i_align = 0;
  92     p_sys->i_original_height = -1;
  93     p_sys->i_original_width = -1;
  94     TAB_INIT( p_sys->i_ssa_styles, p_sys->pp_ssa_styles );
  95     TAB_INIT( p_sys->i_images, p_sys->pp_images );
  96
  97     /* USF subtitles are mandated to be UTF-8, so don't need vlc_iconv */
  98
  99     var_Create( p_dec, "subsdec-align", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 100     var_Get( p_dec, "subsdec-align", &val );
 101     p_sys->i_align = val.i_int;
 102
 103     ParseImageAttachments( p_dec );
 104
 105     if( var_CreateGetBool( p_dec, "subsdec-formatted" ) )
 106     {
 107         if( p_dec->fmt_in.i_extra > 0 )
 108             ParseUSFHeader( p_dec );
 109     }
 110
 111     return VLC_SUCCESS;
 112 }
 113
 114 /****************************************************************************
 115  * DecodeBlock: the whole thing
 116  ****************************************************************************
 117  * This function must be fed with complete subtitles units.
 118  ****************************************************************************/
 119 static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 120 {
 121     subpicture_t *p_spu = NULL;
 122
 123     if( !pp_block || *pp_block == NULL ) return NULL;
 124
 125     p_spu = ParseText( p_dec, *pp_block );
 126
 127     block_Release( *pp_block );
 128     *pp_block = NULL;
 129
 130     return p_spu;
 131 }
 132
 133 /*****************************************************************************
 134  * CloseDecoder: clean up the decoder
 135  *****************************************************************************/
 136 static void CloseDecoder( vlc_object_t *p_this )
 137 {
 138     decoder_t *p_dec = (decoder_t *)p_this;
 139     decoder_sys_t *p_sys = p_dec->p_sys;
 140
 141     if( p_sys->pp_ssa_styles )
 142     {
 143         int i;
 144         for( i = 0; i < p_sys->i_ssa_styles; i++ )
 145         {
 146             if( !p_sys->pp_ssa_styles[i] )
 147                 continue;
 148
 149             free( p_sys->pp_ssa_styles[i]->psz_stylename );
 150             free( p_sys->pp_ssa_styles[i]->font_style.psz_fontname );
 151             free( p_sys->pp_ssa_styles[i] );
 152         }
 153         TAB_CLEAN( p_sys->i_ssa_styles, p_sys->pp_ssa_styles );
 154     }
 155     if( p_sys->pp_images )
 156     {
 157         int i;
 158         for( i = 0; i < p_sys->i_images; i++ )
 159         {
 160             if( !p_sys->pp_images[i] )
 161                 continue;
 162
 163             if( p_sys->pp_images[i]->p_pic )
 164                 picture_Release( p_sys->pp_images[i] );
 165             free( p_sys->pp_images[i]->psz_filename );
 166
 167             free( p_sys->pp_images[i] );
 168         }
 169         TAB_CLEAN( p_sys->i_images, p_sys->pp_images );
 170     }
 171
 172     free( p_sys );
 173 }
 174
 175 /*****************************************************************************
 176  * ParseText: parse an text subtitle packet and send it to the video output
 177  *****************************************************************************/
 178 static subpicture_t *ParseText( decoder_t *p_dec, block_t *p_block )
 179 {
 180     decoder_sys_t *p_sys = p_dec->p_sys;
 181     subpicture_t *p_spu = NULL;
 182     char *psz_subtitle = NULL;
 183
 184     /* We cannot display a subpicture with no date */
 185     if( p_block->i_pts == 0 )
 186     {
 187         msg_Warn( p_dec, "subtitle without a date" );
 188         return NULL;
 189     }
 190
 191     /* Check validity of packet data */
 192     /* An "empty" line containing only \0 can be used to force
 193        and ephemer picture from the screen */
 194     if( p_block->i_buffer < 1 )
 195     {
 196         msg_Warn( p_dec, "no subtitle data" );
 197         return NULL;
 198     }
 199
 200     /* Should be resiliant against bad subtitles */
 201     psz_subtitle = strndup( (const char *)p_block->p_buffer,
 202                             p_block->i_buffer );
 203     if( psz_subtitle == NULL )
 204         return NULL;
 205
 206     /* USF Subtitles are mandated to be UTF-8 -- make sure it is */
 207     if (EnsureUTF8( psz_subtitle ) == NULL)
 208     {
 209         msg_Err( p_dec, _("USF subtitles must be in UTF-8 format.\n"
 210                  "This stream contains USF subtitles which aren't.") );
 211     }
 212
 213     /* Create the subpicture unit */
 214     p_spu = p_dec->pf_spu_buffer_new( p_dec );
 215     if( !p_spu )
 216     {
 217         msg_Warn( p_dec, "can't get spu buffer" );
 218         free( psz_subtitle );
 219         return NULL;
 220     }
 221
 222     p_spu->b_pausable = true;
 223
 224     /* Decode USF strings */
 225     p_spu->p_region = ParseUSFString( p_dec, psz_subtitle, p_spu );
 226
 227     p_spu->i_start = p_block->i_pts;
 228     p_spu->i_stop = p_block->i_pts + p_block->i_length;
 229     p_spu->b_ephemer = (p_block->i_length == 0);
 230     p_spu->b_absolute = false;
 231     p_spu->i_original_picture_width = p_sys->i_original_width;
 232     p_spu->i_original_picture_height = p_sys->i_original_height;
 233
 234     free( psz_subtitle );
 235
 236     return p_spu;
 237 }
 238
 239 static char *GrabAttributeValue( const char *psz_attribute,
 240                                  const char *psz_tag_start )
 241 {
 242     if( psz_attribute && psz_tag_start )
 243     {
 244         char *psz_tag_end = strchr( psz_tag_start, '>' );
 245         char *psz_found   = strcasestr( psz_tag_start, psz_attribute );
 246
 247         if( psz_found )
 248         {
 249             psz_found += strlen( psz_attribute );
 250
 251             if(( *(psz_found++) == '=' ) &&
 252                ( *(psz_found++) == '\"' ))
 253             {
 254                 if( psz_found < psz_tag_end )
 255                 {
 256                     int   i_len = strcspn( psz_found, "\"" );
 257                     return strndup( psz_found, i_len );
 258                 }
 259             }
 260         }
 261     }
 262     return NULL;
 263 }
 264
 265 static ssa_style_t *ParseStyle( decoder_sys_t *p_sys, char *psz_subtitle )
 266 {
 267     ssa_style_t *p_style   = NULL;
 268     char        *psz_style = GrabAttributeValue( "style", psz_subtitle );
 269
 270     if( psz_style )
 271     {
 272         int i;
 273
 274         for( i = 0; i < p_sys->i_ssa_styles; i++ )
 275         {
 276             if( !strcmp( p_sys->pp_ssa_styles[i]->psz_stylename, psz_style ) )
 277                 p_style = p_sys->pp_ssa_styles[i];
 278         }
 279         free( psz_style );
 280     }
 281     return p_style;
 282 }
 283
 284 static int ParsePositionAttributeList( char *psz_subtitle, int *i_align,
 285                                        int *i_x, int *i_y )
 286 {
 287     int   i_mask = 0;
 288
 289     char *psz_align    = GrabAttributeValue( "alignment", psz_subtitle );
 290     char *psz_margin_x = GrabAttributeValue( "horizontal-margin", psz_subtitle );
 291     char *psz_margin_y = GrabAttributeValue( "vertical-margin", psz_subtitle );
 292     /* -- UNSUPPORTED
 293     char *psz_relative = GrabAttributeValue( "relative-to", psz_subtitle );
 294     char *psz_rotate_x = GrabAttributeValue( "rotate-x", psz_subtitle );
 295     char *psz_rotate_y = GrabAttributeValue( "rotate-y", psz_subtitle );
 296     char *psz_rotate_z = GrabAttributeValue( "rotate-z", psz_subtitle );
 297     */
 298
 299     *i_align = SUBPICTURE_ALIGN_BOTTOM;
 300     *i_x = 0;
 301     *i_y = 0;
 302
 303     if( psz_align )
 304     {
 305         if( !strcasecmp( "TopLeft", psz_align ) )
 306             *i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_LEFT;
 307         else if( !strcasecmp( "TopCenter", psz_align ) )
 308             *i_align = SUBPICTURE_ALIGN_TOP;
 309         else if( !strcasecmp( "TopRight", psz_align ) )
 310             *i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_RIGHT;
 311         else if( !strcasecmp( "MiddleLeft", psz_align ) )
 312             *i_align = SUBPICTURE_ALIGN_LEFT;
 313         else if( !strcasecmp( "MiddleCenter", psz_align ) )
 314             *i_align = 0;
 315         else if( !strcasecmp( "MiddleRight", psz_align ) )
 316             *i_align = SUBPICTURE_ALIGN_RIGHT;
 317         else if( !strcasecmp( "BottomLeft", psz_align ) )
 318             *i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_LEFT;
 319         else if( !strcasecmp( "BottomCenter", psz_align ) )
 320             *i_align = SUBPICTURE_ALIGN_BOTTOM;
 321         else if( !strcasecmp( "BottomRight", psz_align ) )
 322             *i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_RIGHT;
 323
 324         i_mask |= ATTRIBUTE_ALIGNMENT;
 325         free( psz_align );
 326     }
 327     if( psz_margin_x )
 328     {
 329         *i_x = atoi( psz_margin_x );
 330         if( strchr( psz_margin_x, '%' ) )
 331             i_mask |= ATTRIBUTE_X_PERCENT;
 332         else
 333             i_mask |= ATTRIBUTE_X;
 334
 335         free( psz_margin_x );
 336     }
 337     if( psz_margin_y )
 338     {
 339         *i_y = atoi( psz_margin_y );
 340         if( strchr( psz_margin_y, '%' ) )
 341             i_mask |= ATTRIBUTE_Y_PERCENT;
 342         else
 343             i_mask |= ATTRIBUTE_Y;
 344
 345         free( psz_margin_y );
 346     }
 347     return i_mask;
 348 }
 349
 350 static void SetupPositions( subpicture_region_t *p_region, char *psz_subtitle )
 351 {
 352     int           i_mask = 0;
 353     int           i_align;
 354     int           i_x, i_y;
 355
 356     i_mask = ParsePositionAttributeList( psz_subtitle, &i_align, &i_x, &i_y );
 357
 358     if( i_mask & ATTRIBUTE_ALIGNMENT )
 359         p_region->i_align = i_align;
 360
 361     /* TODO: Setup % based offsets properly, without adversely affecting
 362      *       everything else in vlc. Will address with separate patch, to
 363      *       prevent this one being any more complicated.
 364      */
 365     if( i_mask & ATTRIBUTE_X )
 366         p_region->i_x = i_x;
 367     else if( i_mask & ATTRIBUTE_X_PERCENT )
 368         p_region->i_x = 0;
 369
 370     if( i_mask & ATTRIBUTE_Y )
 371         p_region->i_y = i_y;
 372     else if( i_mask & ATTRIBUTE_Y_PERCENT )
 373         p_region->i_y = 0;
 374 }
 375
 376 static subpicture_region_t *CreateTextRegion( decoder_t *p_dec,
 377                                               subpicture_t *p_spu,
 378                                               char *psz_subtitle,
 379                                               int i_len,
 380                                               int i_sys_align )
 381 {
 382     decoder_sys_t        *p_sys = p_dec->p_sys;
 383     subpicture_region_t  *p_text_region;
 384     video_format_t        fmt;
 385
 386     /* Create a new subpicture region */
 387     memset( &fmt, 0, sizeof(video_format_t) );
 388     fmt.i_chroma = VLC_FOURCC('T','E','X','T');
 389     fmt.i_aspect = 0;
 390     fmt.i_width = fmt.i_height = 0;
 391     fmt.i_x_offset = fmt.i_y_offset = 0;
 392     p_text_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
 393
 394     if( p_text_region != NULL )
 395     {
 396         ssa_style_t  *p_style = NULL;
 397
 398         p_text_region->psz_text = NULL;
 399         p_text_region->psz_html = strndup( psz_subtitle, i_len );
 400         if( ! p_text_region->psz_html )
 401         {
 402             p_spu->pf_destroy_region( VLC_OBJECT(p_dec), p_text_region );
 403             return NULL;
 404         }
 405
 406         p_style = ParseStyle( p_sys, p_text_region->psz_html );
 407         if( !p_style )
 408         {
 409             int i;
 410
 411             for( i = 0; i < p_sys->i_ssa_styles; i++ )
 412             {
 413                 if( !strcasecmp( p_sys->pp_ssa_styles[i]->psz_stylename, "Default" ) )
 414                     p_style = p_sys->pp_ssa_styles[i];
 415             }
 416         }
 417
 418         if( p_style )
 419         {
 420             msg_Dbg( p_dec, "style is: %s", p_style->psz_stylename );
 421
 422             p_text_region->p_style = &p_style->font_style;
 423             p_text_region->i_align = p_style->i_align;
 424
 425             /* TODO: Setup % based offsets properly, without adversely affecting
 426              *       everything else in vlc. Will address with separate patch,
 427              *       to prevent this one being any more complicated.
 428
 429                      * p_style->i_margin_percent_h;
 430                      * p_style->i_margin_percent_v;
 431              */
 432             p_text_region->i_x         = p_style->i_margin_h;
 433             p_text_region->i_y         = p_style->i_margin_v;
 434
 435         }
 436         else
 437         {
 438             p_text_region->i_align = SUBPICTURE_ALIGN_BOTTOM | i_sys_align;
 439             p_text_region->i_x = i_sys_align ? 20 : 0;
 440             p_text_region->i_y = 10;
 441         }
 442         /* Look for position arguments which may override the style-based
 443          * defaults.
 444          */
 445         SetupPositions( p_text_region, psz_subtitle );
 446
 447         p_text_region->p_next = NULL;
 448     }
 449     return p_text_region;
 450 }
 451
 452 static int ParseImageAttachments( decoder_t *p_dec )
 453 {
 454     decoder_sys_t        *p_sys = p_dec->p_sys;
 455     input_attachment_t  **pp_attachments;
 456     int                   i_attachments_cnt;
 457     int                   k = 0;
 458
 459     if( VLC_SUCCESS != decoder_GetInputAttachments( p_dec, &pp_attachments, &i_attachments_cnt ))
 460         return VLC_EGENERIC;
 461
 462     for( k = 0; k < i_attachments_cnt; k++ )
 463     {
 464         input_attachment_t *p_attach = pp_attachments[k];
 465
 466         vlc_fourcc_t  type  = 0;
 467
 468         if( ( !strcmp( p_attach->psz_mime, "image/bmp" ) )      || /* BMP */
 469             ( !strcmp( p_attach->psz_mime, "image/x-bmp" ) )    ||
 470             ( !strcmp( p_attach->psz_mime, "image/x-bitmap" ) ) ||
 471             ( !strcmp( p_attach->psz_mime, "image/x-ms-bmp" ) ) )
 472         {
 473              type = VLC_FOURCC('b','m','p',' ');
 474         }
 475         else if( ( !strcmp( p_attach->psz_mime, "image/x-portable-anymap" ) )  || /* PNM */
 476                  ( !strcmp( p_attach->psz_mime, "image/x-portable-bitmap" ) )  || /* PBM */
 477                  ( !strcmp( p_attach->psz_mime, "image/x-portable-graymap" ) ) || /* PGM */
 478                  ( !strcmp( p_attach->psz_mime, "image/x-portable-pixmap" ) ) )   /* PPM */
 479         {
 480             type = VLC_FOURCC('p','n','m',' ');
 481         }
 482         else if ( !strcmp( p_attach->psz_mime, "image/gif" ) )         /* GIF */
 483             type = VLC_FOURCC('g','i','f',' ');
 484         else if ( !strcmp( p_attach->psz_mime, "image/jpeg" ) )        /* JPG, JPEG */
 485             type = VLC_FOURCC('j','p','e','g');
 486         else if ( !strcmp( p_attach->psz_mime, "image/pcx" ) )         /* PCX */
 487             type = VLC_FOURCC('p','c','x',' ');
 488         else if ( !strcmp( p_attach->psz_mime, "image/png" ) )         /* PNG */
 489             type = VLC_FOURCC('p','n','g',' ');
 490         else if ( !strcmp( p_attach->psz_mime, "image/tiff" ) )        /* TIF, TIFF */
 491             type = VLC_FOURCC('t','i','f','f');
 492         else if ( !strcmp( p_attach->psz_mime, "image/x-tga" ) )       /* TGA */
 493             type = VLC_FOURCC('t','g','a',' ');
 494         else if ( !strcmp( p_attach->psz_mime, "image/x-xpixmap") )    /* XPM */
 495             type = VLC_FOURCC('x','p','m',' ');
 496
 497         if( ( type != 0 ) &&
 498             ( p_attach->i_data > 0 ) &&
 499             ( p_attach->p_data != NULL ) )
 500         {
 501             picture_t         *p_pic = NULL;
 502             image_handler_t   *p_image;
 503
 504             p_image = image_HandlerCreate( p_dec );
 505             if( p_image != NULL )
 506             {
 507                 block_t   *p_block;
 508
 509                 p_block = block_New( p_image->p_parent, p_attach->i_data );
 510
 511                 if( p_block != NULL )
 512                 {
 513                     video_format_t     fmt_in;
 514                     video_format_t     fmt_out;
 515
 516                     memcpy( p_block->p_buffer, p_attach->p_data, p_attach->i_data );
 517
 518                     memset( &fmt_in,  0, sizeof( video_format_t));
 519                     memset( &fmt_out, 0, sizeof( video_format_t));
 520
 521                     fmt_in.i_chroma  = type;
 522                     fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
 523
 524                     /* Find a suitable decoder module */
 525                     if( module_Exists( p_dec, "sdl_image" ) )
 526                     {
 527                         /* ffmpeg thinks it can handle bmp properly but it can't (at least
 528                          * not all of them), so use sdl_image if it is available */
 529
 530                         vlc_value_t val;
 531
 532                         var_Create( p_dec, "codec", VLC_VAR_MODULE | VLC_VAR_DOINHERIT );
 533                         val.psz_string = (char*) "sdl_image";
 534                         var_Set( p_dec, "codec", val );
 535                     }
 536
 537                     p_pic = image_Read( p_image, p_block, &fmt_in, &fmt_out );
 538                     var_Destroy( p_dec, "codec" );
 539                 }
 540
 541                 image_HandlerDelete( p_image );
 542             }
 543             if( p_pic )
 544             {
 545                 image_attach_t *p_picture = malloc( sizeof(image_attach_t) );
 546
 547                 if( p_picture )
 548                 {
 549                     p_picture->psz_filename = strdup( p_attach->psz_name );
 550                     p_picture->p_pic = p_pic;
 551
 552                     TAB_APPEND( p_sys->i_images, p_sys->pp_images, p_picture );
 553                 }
 554             }
 555         }
 556         vlc_input_attachment_Delete( pp_attachments[ k ] );
 557     }
 558     free( pp_attachments );
 559
 560     return VLC_SUCCESS;
 561 }
 562
 563 static void ParseUSFHeaderTags( decoder_t *p_dec, xml_reader_t *p_xml_reader )
 564 {
 565     decoder_sys_t *p_sys = p_dec->p_sys;
 566     char *psz_node;
 567     ssa_style_t *p_style = NULL;
 568     int i_style_level = 0;
 569     int i_metadata_level = 0;
 570
 571     while ( xml_ReaderRead( p_xml_reader ) == 1 )
 572     {
 573         switch ( xml_ReaderNodeType( p_xml_reader ) )
 574         {
 575             case XML_READER_TEXT:
 576             case XML_READER_NONE:
 577                 break;
 578             case XML_READER_ENDELEM:
 579                 psz_node = xml_ReaderName( p_xml_reader );
 580
 581                 if( !psz_node )
 582                     break;
 583                 switch (i_style_level)
 584                 {
 585                     case 0:
 586                         if( !strcasecmp( "metadata", psz_node ) && (i_metadata_level == 1) )
 587                         {
 588                             i_metadata_level--;
 589                         }
 590                         break;
 591                     case 1:
 592                         if( !strcasecmp( "styles", psz_node ) )
 593                         {
 594                             i_style_level--;
 595                         }
 596                         break;
 597                     case 2:
 598                         if( !strcasecmp( "style", psz_node ) )
 599                         {
 600                             TAB_APPEND( p_sys->i_ssa_styles, p_sys->pp_ssa_styles, p_style );
 601
 602                             p_style = NULL;
 603                             i_style_level--;
 604                         }
 605                         break;
 606                 }
 607
 608                 free( psz_node );
 609                 break;
 610             case XML_READER_STARTELEM:
 611                 psz_node = xml_ReaderName( p_xml_reader );
 612
 613                 if( !psz_node )
 614                     break;
 615
 616                 if( !strcasecmp( "metadata", psz_node ) && (i_style_level == 0) )
 617                 {
 618                     i_metadata_level++;
 619                 }
 620                 else if( !strcasecmp( "resolution", psz_node ) &&
 621                          ( i_metadata_level == 1) )
 622                 {
 623                     while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 624                     {
 625                         char *psz_name = xml_ReaderName ( p_xml_reader );
 626                         char *psz_value = xml_ReaderValue ( p_xml_reader );
 627
 628                         if( psz_name && psz_value )
 629                         {
 630                             if( !strcasecmp( "x", psz_name ) )
 631                                 p_sys->i_original_width = atoi( psz_value );
 632                             else if( !strcasecmp( "y", psz_name ) )
 633                                 p_sys->i_original_height = atoi( psz_value );
 634                         }
 635                         free( psz_name );
 636                         free( psz_value );
 637                     }
 638                 }
 639                 else if( !strcasecmp( "styles", psz_node ) && (i_style_level == 0) )
 640                 {
 641                     i_style_level++;
 642                 }
 643                 else if( !strcasecmp( "style", psz_node ) && (i_style_level == 1) )
 644                 {
 645                     i_style_level++;
 646
 647                     p_style = calloc( 1, sizeof(ssa_style_t) );
 648                     if( ! p_style )
 649                     {
 650                         free( psz_node );
 651                         break;
 652                     }
 653                     /* All styles are supposed to default to Default, and then
 654                      * one or more settings are over-ridden.
 655                      * At the moment this only effects styles defined AFTER
 656                      * Default in the XML
 657                      */
 658                     int i;
 659                     for( i = 0; i < p_sys->i_ssa_styles; i++ )
 660                     {
 661                         if( !strcasecmp( p_sys->pp_ssa_styles[i]->psz_stylename, "Default" ) )
 662                         {
 663                             ssa_style_t *p_default_style = p_sys->pp_ssa_styles[i];
 664
 665                             memcpy( p_style, p_default_style, sizeof( ssa_style_t ) );
 666                             p_style->font_style.psz_fontname = strdup( p_style->font_style.psz_fontname );
 667                             p_style->psz_stylename = NULL;
 668                         }
 669                     }
 670
 671                     while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 672                     {
 673                         char *psz_name = xml_ReaderName ( p_xml_reader );
 674                         char *psz_value = xml_ReaderValue ( p_xml_reader );
 675
 676                         if( psz_name && psz_value )
 677                         {
 678                             if( !strcasecmp( "name", psz_name ) )
 679                                 p_style->psz_stylename = strdup( psz_value);
 680                         }
 681                         free( psz_name );
 682                         free( psz_value );
 683                     }
 684                 }
 685                 else if( !strcasecmp( "fontstyle", psz_node ) && (i_style_level == 2) )
 686                 {
 687                     while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 688                     {
 689                         char *psz_name = xml_ReaderName ( p_xml_reader );
 690                         char *psz_value = xml_ReaderValue ( p_xml_reader );
 691
 692                         if( psz_name && psz_value )
 693                         {
 694                             if( !strcasecmp( "face", psz_name ) )
 695                             {
 696                                 free( p_style->font_style.psz_fontname );
 697                                 p_style->font_style.psz_fontname = strdup( psz_value );
 698                             }
 699                             else if( !strcasecmp( "size", psz_name ) )
 700                             {
 701                                 if( ( *psz_value == '+' ) || ( *psz_value == '-' ) )
 702                                 {
 703                                     int i_value = atoi( psz_value );
 704
 705                                     if( ( i_value >= -5 ) && ( i_value <= 5 ) )
 706                                         p_style->font_style.i_font_size  +=
 707                                             ( i_value * p_style->font_style.i_font_size ) / 10;
 708                                     else if( i_value < -5 )
 709                                         p_style->font_style.i_font_size  = - i_value;
 710                                     else if( i_value > 5 )
 711                                         p_style->font_style.i_font_size  = i_value;
 712                                 }
 713                                 else
 714                                     p_style->font_style.i_font_size  = atoi( psz_value );
 715                             }
 716                             else if( !strcasecmp( "italic", psz_name ) )
 717                             {
 718                                 if( !strcasecmp( "yes", psz_value ))
 719                                     p_style->font_style.i_style_flags |= STYLE_ITALIC;
 720                                 else
 721                                     p_style->font_style.i_style_flags &= ~STYLE_ITALIC;
 722                             }
 723                             else if( !strcasecmp( "weight", psz_name ) )
 724                             {
 725                                 if( !strcasecmp( "bold", psz_value ))
 726                                     p_style->font_style.i_style_flags |= STYLE_BOLD;
 727                                 else
 728                                     p_style->font_style.i_style_flags &= ~STYLE_BOLD;
 729                             }
 730                             else if( !strcasecmp( "underline", psz_name ) )
 731                             {
 732                                 if( !strcasecmp( "yes", psz_value ))
 733                                     p_style->font_style.i_style_flags |= STYLE_UNDERLINE;
 734                                 else
 735                                     p_style->font_style.i_style_flags &= ~STYLE_UNDERLINE;
 736                             }
 737                             else if( !strcasecmp( "color", psz_name ) )
 738                             {
 739                                 if( *psz_value == '#' )
 740                                 {
 741                                     unsigned long col = strtol(psz_value+1, NULL, 16);
 742                                     p_style->font_style.i_font_color = (col & 0x00ffffff);
 743                                     p_style->font_style.i_font_alpha = (col >> 24) & 0xff;
 744                                 }
 745                             }
 746                             else if( !strcasecmp( "outline-color", psz_name ) )
 747                             {
 748                                 if( *psz_value == '#' )
 749                                 {
 750                                     unsigned long col = strtol(psz_value+1, NULL, 16);
 751                                     p_style->font_style.i_outline_color = (col & 0x00ffffff);
 752                                     p_style->font_style.i_outline_alpha = (col >> 24) & 0xff;
 753                                 }
 754                             }
 755                             else if( !strcasecmp( "outline-level", psz_name ) )
 756                             {
 757                                 p_style->font_style.i_outline_width = atoi( psz_value );
 758                             }
 759                             else if( !strcasecmp( "shadow-color", psz_name ) )
 760                             {
 761                                 if( *psz_value == '#' )
 762                                 {
 763                                     unsigned long col = strtol(psz_value+1, NULL, 16);
 764                                     p_style->font_style.i_shadow_color = (col & 0x00ffffff);
 765                                     p_style->font_style.i_shadow_alpha = (col >> 24) & 0xff;
 766                                 }
 767                             }
 768                             else if( !strcasecmp( "shadow-level", psz_name ) )
 769                             {
 770                                 p_style->font_style.i_shadow_width = atoi( psz_value );
 771                             }
 772                             else if( !strcasecmp( "back-color", psz_name ) )
 773                             {
 774                                 if( *psz_value == '#' )
 775                                 {
 776                                     unsigned long col = strtol(psz_value+1, NULL, 16);
 777                                     p_style->font_style.i_karaoke_background_color = (col & 0x00ffffff);
 778                                     p_style->font_style.i_karaoke_background_alpha = (col >> 24) & 0xff;
 779                                 }
 780                             }
 781                             else if( !strcasecmp( "spacing", psz_name ) )
 782                             {
 783                                 p_style->font_style.i_spacing = atoi( psz_value );
 784                             }
 785                         }
 786                         free( psz_name );
 787                         free( psz_value );
 788                     }
 789                 }
 790                 else if( !strcasecmp( "position", psz_node ) && (i_style_level == 2) )
 791                 {
 792                     while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 793                     {
 794                         char *psz_name = xml_ReaderName ( p_xml_reader );
 795                         char *psz_value = xml_ReaderValue ( p_xml_reader );
 796
 797                         if( psz_name && psz_value )
 798                         {
 799                             if( !strcasecmp( "alignment", psz_name ) )
 800                             {
 801                                 if( !strcasecmp( "TopLeft", psz_value ) )
 802                                     p_style->i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_LEFT;
 803                                 else if( !strcasecmp( "TopCenter", psz_value ) )
 804                                     p_style->i_align = SUBPICTURE_ALIGN_TOP;
 805                                 else if( !strcasecmp( "TopRight", psz_value ) )
 806                                     p_style->i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_RIGHT;
 807                                 else if( !strcasecmp( "MiddleLeft", psz_value ) )
 808                                     p_style->i_align = SUBPICTURE_ALIGN_LEFT;
 809                                 else if( !strcasecmp( "MiddleCenter", psz_value ) )
 810                                     p_style->i_align = 0;
 811                                 else if( !strcasecmp( "MiddleRight", psz_value ) )
 812                                     p_style->i_align = SUBPICTURE_ALIGN_RIGHT;
 813                                 else if( !strcasecmp( "BottomLeft", psz_value ) )
 814                                     p_style->i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_LEFT;
 815                                 else if( !strcasecmp( "BottomCenter", psz_value ) )
 816                                     p_style->i_align = SUBPICTURE_ALIGN_BOTTOM;
 817                                 else if( !strcasecmp( "BottomRight", psz_value ) )
 818                                     p_style->i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_RIGHT;
 819                             }
 820                             else if( !strcasecmp( "horizontal-margin", psz_name ) )
 821                             {
 822                                 if( strchr( psz_value, '%' ) )
 823                                 {
 824                                     p_style->i_margin_h = 0;
 825                                     p_style->i_margin_percent_h = atoi( psz_value );
 826                                 }
 827                                 else
 828                                 {
 829                                     p_style->i_margin_h = atoi( psz_value );
 830                                     p_style->i_margin_percent_h = 0;
 831                                 }
 832                             }
 833                             else if( !strcasecmp( "vertical-margin", psz_name ) )
 834                             {
 835                                 if( strchr( psz_value, '%' ) )
 836                                 {
 837                                     p_style->i_margin_v = 0;
 838                                     p_style->i_margin_percent_v = atoi( psz_value );
 839                                 }
 840                                 else
 841                                 {
 842                                     p_style->i_margin_v = atoi( psz_value );
 843                                     p_style->i_margin_percent_v = 0;
 844                                 }
 845                             }
 846                         }
 847                         free( psz_name );
 848                         free( psz_value );
 849                     }
 850                 }
 851
 852                 free( psz_node );
 853                 break;
 854         }
 855     }
 856     free( p_style );
 857 }
 858
 859
 860
 861 static subpicture_region_t *ParseUSFString( decoder_t *p_dec,
 862                                             char *psz_subtitle,
 863                                             subpicture_t *p_spu_in )
 864 {
 865     decoder_sys_t        *p_sys = p_dec->p_sys;
 866     subpicture_t         *p_spu = p_spu_in;
 867     subpicture_region_t  *p_region_first = NULL;
 868     subpicture_region_t  *p_region_upto  = p_region_first;
 869
 870     while( *psz_subtitle )
 871     {
 872         if( *psz_subtitle == '<' )
 873         {
 874             char *psz_end = NULL;
 875
 876             if(( !strncasecmp( psz_subtitle, "<text ", 6 )) ||
 877                ( !strncasecmp( psz_subtitle, "<text>", 6 )))
 878             {
 879                 psz_end = strcasestr( psz_subtitle, "</text>" );
 880
 881                 if( psz_end )
 882                 {
 883                     subpicture_region_t  *p_text_region;
 884
 885                     psz_end += strcspn( psz_end, ">" ) + 1;
 886
 887                     p_text_region = CreateTextRegion( p_dec,
 888                                                       p_spu,
 889                                                       psz_subtitle,
 890                                                       psz_end - psz_subtitle,
 891                                                       p_sys->i_align );
 892
 893                     if( p_text_region )
 894                     {
 895                         p_text_region->psz_text = CreatePlainText( p_text_region->psz_html );
 896
 897                         if( ! var_CreateGetBool( p_dec, "subsdec-formatted" ) )
 898                         {
 899                             free( p_text_region->psz_html );
 900                             p_text_region->psz_html = NULL;
 901                         }
 902                     }
 903
 904                     if( !p_region_first )
 905                     {
 906                         p_region_first = p_region_upto = p_text_region;
 907                     }
 908                     else if( p_text_region )
 909                     {
 910                         p_region_upto->p_next = p_text_region;
 911                         p_region_upto = p_region_upto->p_next;
 912                     }
 913                 }
 914             }
 915             else if(( !strncasecmp( psz_subtitle, "<karaoke ", 9 )) ||
 916                     ( !strncasecmp( psz_subtitle, "<karaoke>", 9 )))
 917             {
 918                 psz_end = strcasestr( psz_subtitle, "</karaoke>" );
 919
 920                 if( psz_end )
 921                 {
 922                     subpicture_region_t  *p_text_region;
 923
 924                     psz_end += strcspn( psz_end, ">" ) + 1;
 925
 926                     p_text_region = CreateTextRegion( p_dec,
 927                                                       p_spu,
 928                                                       psz_subtitle,
 929                                                       psz_end - psz_subtitle,
 930                                                       p_sys->i_align );
 931
 932                     if( p_text_region )
 933                     {
 934                         if( ! var_CreateGetBool( p_dec, "subsdec-formatted" ) )
 935                         {
 936                             free( p_text_region->psz_html );
 937                             p_text_region->psz_html = NULL;
 938                         }
 939                     }
 940                     if( !p_region_first )
 941                     {
 942                         p_region_first = p_region_upto = p_text_region;
 943                     }
 944                     else if( p_text_region )
 945                     {
 946                         p_region_upto->p_next = p_text_region;
 947                         p_region_upto = p_region_upto->p_next;
 948                     }
 949                 }
 950             }
 951             else if(( !strncasecmp( psz_subtitle, "<image ", 7 )) ||
 952                     ( !strncasecmp( psz_subtitle, "<image>", 7 )))
 953             {
 954                 subpicture_region_t *p_image_region = NULL;
 955
 956                 char *psz_end = strcasestr( psz_subtitle, "</image>" );
 957                 char *psz_content = strchr( psz_subtitle, '>' );
 958                 int   i_transparent = -1;
 959
 960                 /* If a colorkey parameter is specified, then we have to map
 961                  * that index in the picture through as transparent (it is
 962                  * required by the USF spec but is also recommended that if the
 963                  * creator really wants a transparent colour that they use a
 964                  * type like PNG that properly supports it; this goes doubly
 965                  * for VLC because the pictures are stored internally in YUV
 966                  * and the resulting colour-matching may not produce the
 967                  * desired results.)
 968                  */
 969                 char *psz_tmp = GrabAttributeValue( "colorkey", psz_subtitle );
 970                 if( psz_tmp )
 971                 {
 972                     if( *psz_tmp == '#' )
 973                         i_transparent = strtol( psz_tmp + 1, NULL, 16 ) & 0x00ffffff;
 974                     free( psz_tmp );
 975                 }
 976                 if( psz_content && ( psz_content < psz_end ) )
 977                 {
 978                     char *psz_filename = strndup( &psz_content[1], psz_end - &psz_content[1] );
 979                     if( psz_filename )
 980                     {
 981                         p_image_region = LoadEmbeddedImage( p_dec, p_spu,
 982                                             psz_filename, i_transparent );
 983                         free( psz_filename );
 984                     }
 985                 }
 986
 987                 if( psz_end ) psz_end += strcspn( psz_end, ">" ) + 1;
 988
 989                 if( p_image_region )
 990                 {
 991                     SetupPositions( p_image_region, psz_subtitle );
 992
 993                     p_image_region->p_next   = NULL;
 994                     p_image_region->psz_text = NULL;
 995                     p_image_region->psz_html = NULL;
 996
 997                 }
 998                 if( !p_region_first )
 999                 {
1000                     p_region_first = p_region_upto = p_image_region;
1001                 }
1002                 else if( p_image_region )
1003                 {
1004                     p_region_upto->p_next = p_image_region;
1005                     p_region_upto = p_region_upto->p_next;
1006                 }
1007             }
1008             if( psz_end )
1009                 psz_subtitle = psz_end - 1;
1010
1011             psz_subtitle += strcspn( psz_subtitle, ">" );
1012         }
1013
1014         psz_subtitle++;
1015     }
1016
1017     return p_region_first;
1018 }
1019
1020 /*****************************************************************************
1021  * ParseUSFHeader: Retrieve global formatting information etc
1022  *****************************************************************************/
1023 static void ParseUSFHeader( decoder_t *p_dec )
1024 {
1025     stream_t      *p_sub = NULL;
1026     xml_t         *p_xml = NULL;
1027     xml_reader_t  *p_xml_reader = NULL;
1028
1029     p_sub = stream_MemoryNew( VLC_OBJECT(p_dec),
1030                               p_dec->fmt_in.p_extra,
1031                               p_dec->fmt_in.i_extra,
1032                               true );
1033     if( !p_sub )
1034         return;
1035
1036     p_xml = xml_Create( p_dec );
1037     if( p_xml )
1038     {
1039         p_xml_reader = xml_ReaderCreate( p_xml, p_sub );
1040         if( p_xml_reader )
1041         {
1042             /* Look for Root Node */
1043             if( xml_ReaderRead( p_xml_reader ) == 1 )
1044             {
1045                 char *psz_node = xml_ReaderName( p_xml_reader );
1046
1047                 if( !strcasecmp( "usfsubtitles", psz_node ) )
1048                     ParseUSFHeaderTags( p_dec, p_xml_reader );
1049
1050                 free( psz_node );
1051             }
1052
1053             xml_ReaderDelete( p_xml, p_xml_reader );
1054         }
1055         xml_Delete( p_xml );
1056     }
1057     stream_Delete( p_sub );
1058 }
1059
1060 /* Function now handles tags which has attribute values, and tries
1061  * to deal with &' commands too. It no longer modifies the string
1062  * in place, so that the original text can be reused
1063  */
1064 static char *StripTags( char *psz_subtitle )
1065 {
1066     char *psz_text_start;
1067     char *psz_text;
1068
1069     psz_text = psz_text_start = malloc( strlen( psz_subtitle ) + 1 );
1070     if( !psz_text_start )
1071         return NULL;
1072
1073     while( *psz_subtitle )
1074     {
1075         /* Mask out any pre-existing LFs in the subtitle */
1076         if( *psz_subtitle == '\n' )
1077             *psz_subtitle = ' ';
1078
1079         if( *psz_subtitle == '<' )
1080         {
1081             if( strncasecmp( psz_subtitle, "<br/>", 5 ) == 0 )
1082                 *psz_text++ = '\n';
1083
1084             psz_subtitle += strcspn( psz_subtitle, ">" );
1085         }
1086         else if( *psz_subtitle == '&' )
1087         {
1088             if( !strncasecmp( psz_subtitle, "&lt;", 4 ))
1089             {
1090                 *psz_text++ = '<';
1091                 psz_subtitle += strcspn( psz_subtitle, ";" );
1092             }
1093             else if( !strncasecmp( psz_subtitle, "&gt;", 4 ))
1094             {
1095                 *psz_text++ = '>';
1096                 psz_subtitle += strcspn( psz_subtitle, ";" );
1097             }
1098             else if( !strncasecmp( psz_subtitle, "&amp;", 5 ))
1099             {
1100                 *psz_text++ = '&';
1101                 psz_subtitle += strcspn( psz_subtitle, ";" );
1102             }
1103             else if( !strncasecmp( psz_subtitle, "&quot;", 6 ))
1104             {
1105                 *psz_text++ = '\"';
1106                 psz_subtitle += strcspn( psz_subtitle, ";" );
1107             }
1108             else
1109             {
1110                 /* Assume it is just a normal ampersand */
1111                 *psz_text++ = '&';
1112             }
1113         }
1114         else
1115         {
1116             *psz_text++ = *psz_subtitle;
1117         }
1118
1119         psz_subtitle++;
1120     }
1121     *psz_text = '\0';
1122     psz_text_start = realloc( psz_text_start, strlen( psz_text_start ) + 1 );
1123
1124     return psz_text_start;
1125 }
1126
1127 /* Turn a HTML subtitle, turn into a plain-text version,
1128  *  complete with sensible whitespace compaction
1129  */
1130
1131 static char *CreatePlainText( char *psz_subtitle )
1132 {
1133     char *psz_text = StripTags( psz_subtitle );
1134     char *s;
1135
1136     if( !psz_text )
1137         return NULL;
1138
1139     s = strpbrk( psz_text, "\t\r\n " );
1140     while( s )
1141     {
1142         int   k;
1143         char  spc = ' ';
1144         int   i_whitespace = strspn( s, "\t\r\n " );
1145
1146         /* Favour '\n' over other whitespaces - if one of these
1147          * occurs in the whitespace use a '\n' as our value,
1148          * otherwise just use a ' '
1149          */
1150         for( k = 0; k < i_whitespace; k++ )
1151             if( s[k] == '\n' ) spc = '\n';
1152
1153         if( i_whitespace > 1 )
1154         {
1155             memmove( &s[1],
1156                      &s[i_whitespace],
1157                      strlen( s ) - i_whitespace + 1 );
1158         }
1159         *s++ = spc;
1160
1161         s = strpbrk( s, "\t\r\n " );
1162     }
1163     return psz_text;
1164 }
1165
1166 /****************************************************************************
1167  * download and resize image located at psz_url
1168  ***************************************************************************/
1169 static subpicture_region_t *LoadEmbeddedImage( decoder_t *p_dec,
1170                                                subpicture_t *p_spu,
1171                                                const char *psz_filename,
1172                                                int i_transparent_color )
1173 {
1174     decoder_sys_t         *p_sys = p_dec->p_sys;
1175     subpicture_region_t   *p_region;
1176     video_format_t         fmt_out;
1177     int                    k;
1178     picture_t             *p_pic = NULL;
1179
1180     for( k = 0; k < p_sys->i_images; k++ )
1181     {
1182         if( p_sys->pp_images &&
1183             !strcmp( p_sys->pp_images[k]->psz_filename, psz_filename ) )
1184         {
1185             p_pic = p_sys->pp_images[k]->p_pic;
1186             break;
1187         }
1188     }
1189
1190     if( !p_pic )
1191     {
1192         msg_Err( p_dec, "Unable to read image %s", psz_filename );
1193         return NULL;
1194     }
1195
1196     /* Display the feed's image */
1197     memset( &fmt_out, 0, sizeof( video_format_t));
1198
1199     fmt_out.i_chroma = VLC_FOURCC('Y','U','V','A');
1200     fmt_out.i_aspect = VOUT_ASPECT_FACTOR;
1201     fmt_out.i_sar_num = fmt_out.i_sar_den = 1;
1202     fmt_out.i_width =
1203         fmt_out.i_visible_width = p_pic->p[Y_PLANE].i_visible_pitch;
1204     fmt_out.i_height =
1205         fmt_out.i_visible_height = p_pic->p[Y_PLANE].i_visible_lines;
1206
1207     p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt_out );
1208     if( !p_region )
1209     {
1210         msg_Err( p_dec, "cannot allocate SPU region" );
1211         return NULL;
1212     }
1213     vout_CopyPicture( p_dec, &p_region->picture, p_pic );
1214
1215     /* This isn't the best way to do this - if you really want transparency, then
1216      * you're much better off using an image type that supports it like PNG. The
1217      * spec requires this support though.
1218      */
1219     if( i_transparent_color > 0 )
1220     {
1221         uint8_t i_r = ( i_transparent_color >> 16 ) & 0xff;
1222         uint8_t i_g = ( i_transparent_color >>  8 ) & 0xff;
1223         uint8_t i_b = ( i_transparent_color       ) & 0xff;
1224         uint8_t i_y = ( ( (  66 * i_r + 129 * i_g +  25 * i_b + 128 ) >> 8 ) + 16 );
1225         uint8_t i_u =   ( ( -38 * i_r -  74 * i_g + 112 * i_b + 128 ) >> 8 ) + 128 ;
1226         uint8_t i_v =   ( ( 112 * i_r -  94 * i_g -  18 * i_b + 128 ) >> 8 ) + 128 ;
1227
1228         if( ( p_region->picture.Y_PITCH == p_region->picture.U_PITCH ) &&
1229             ( p_region->picture.Y_PITCH == p_region->picture.V_PITCH ) &&
1230             ( p_region->picture.Y_PITCH == p_region->picture.A_PITCH ) )
1231         {
1232             int i_lines = p_region->picture.p[ Y_PLANE ].i_lines;
1233             if( i_lines > p_region->picture.p[ U_PLANE ].i_lines )
1234                 i_lines = p_region->picture.p[ U_PLANE ].i_lines;
1235             if( i_lines > p_region->picture.p[ V_PLANE ].i_lines )
1236                 i_lines = p_region->picture.p[ V_PLANE ].i_lines;
1237             if( i_lines > p_region->picture.p[ A_PLANE ].i_lines )
1238                 i_lines = p_region->picture.p[ A_PLANE ].i_lines;
1239
1240             int   i;
1241
1242             for( i = 0; i < p_region->picture.A_PITCH * i_lines; i++ )
1243             {
1244                 if(( p_region->picture.Y_PIXELS[ i ] == i_y ) &&
1245                    ( p_region->picture.U_PIXELS[ i ] == i_u ) &&
1246                    ( p_region->picture.V_PIXELS[ i ] == i_v ) )
1247                 {
1248                     p_region->picture.A_PIXELS[ i ] = 1;
1249                 }
1250             }
1251         }
1252     }
1253     return p_region;
1254 }