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