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