git.sesse.net Git - vlc/blob - modules/codec/spudec/parse.c

   1 /*****************************************************************************
   2  * parse.c: SPU parser
   3  *****************************************************************************
   4  * Copyright (C) 2000-2001, 2005, 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Sam Hocevar <sam@zoy.org>
   8  *          Laurent Aimar <fenrir@via.ecp.fr>
   9  *          Gildas Bazin <gbazin@videolan.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_vout.h>
  35 #include <vlc_codec.h>
  36 #include <vlc_input.h>
  37
  38 #include "spudec.h"
  39
  40 /*****************************************************************************
  41  * Local prototypes.
  42  *****************************************************************************/
  43 typedef struct
  44 {
  45     int i_width;
  46     int i_height;
  47     int i_x;
  48     int i_y;
  49 } spu_properties_t;
  50
  51 typedef struct
  52 {
  53     mtime_t i_pts;                                 /* presentation timestamp */
  54
  55     int   pi_offset[2];                              /* byte offsets to data */
  56     uint16_t *p_data;
  57
  58     /* Color information */
  59     bool b_palette;
  60     uint8_t    pi_alpha[4];
  61     uint8_t    pi_yuv[4][3];
  62
  63     /* Auto crop fullscreen subtitles */
  64     bool b_auto_crop;
  65     int i_y_top_offset;
  66     int i_y_bottom_offset;
  67
  68 } subpicture_data_t;
  69
  70 static int  ParseControlSeq( decoder_t *, subpicture_t *, subpicture_data_t *,
  71                              spu_properties_t * );
  72 static int  ParseRLE       ( decoder_t *, subpicture_data_t *,
  73                              const spu_properties_t * );
  74 static void Render         ( decoder_t *, subpicture_t *, subpicture_data_t *,
  75                              const spu_properties_t * );
  76
  77 /*****************************************************************************
  78  * AddNibble: read a nibble from a source packet and add it to our integer.
  79  *****************************************************************************/
  80 static inline unsigned int AddNibble( unsigned int i_code,
  81                                       uint8_t *p_src, unsigned int *pi_index )
  82 {
  83     if( *pi_index & 0x1 )
  84     {
  85         return( i_code << 4 | ( p_src[(*pi_index)++ >> 1] & 0xf ) );
  86     }
  87     else
  88     {
  89         return( i_code << 4 | p_src[(*pi_index)++ >> 1] >> 4 );
  90     }
  91 }
  92
  93 /*****************************************************************************
  94  * ParsePacket: parse an SPU packet and send it to the video output
  95  *****************************************************************************
  96  * This function parses the SPU packet and, if valid, sends it to the
  97  * video output.
  98  *****************************************************************************/
  99 subpicture_t * ParsePacket( decoder_t *p_dec )
 100 {
 101     decoder_sys_t *p_sys = p_dec->p_sys;
 102     subpicture_t *p_spu;
 103     subpicture_data_t spu_data;
 104     spu_properties_t spu_properties;
 105
 106     /* Allocate the subpicture internal data. */
 107     p_spu = decoder_NewSubpicture( p_dec );
 108     if( !p_spu ) return NULL;
 109
 110     /* */
 111     spu_data.p_data = NULL;
 112     spu_data.b_palette = false;
 113     spu_data.b_auto_crop = false;
 114     spu_data.i_y_top_offset = 0;
 115     spu_data.i_y_bottom_offset = 0;
 116
 117     spu_data.pi_alpha[0] = 0x00;
 118     spu_data.pi_alpha[1] = 0x0f;
 119     spu_data.pi_alpha[2] = 0x0f;
 120     spu_data.pi_alpha[3] = 0x0f;
 121
 122     /* Get display time now. If we do it later, we may miss the PTS. */
 123     spu_data.i_pts = p_sys->i_pts;
 124
 125     p_spu->i_original_picture_width =
 126         p_dec->fmt_in.subs.spu.i_original_frame_width;
 127     p_spu->i_original_picture_height =
 128         p_dec->fmt_in.subs.spu.i_original_frame_height;
 129
 130     memset( &spu_properties, 0, sizeof(spu_properties) );
 131
 132     /* Getting the control part */
 133     if( ParseControlSeq( p_dec, p_spu, &spu_data, &spu_properties ) )
 134     {
 135         /* There was a parse error, delete the subpicture */
 136         decoder_DeleteSubpicture( p_dec, p_spu );
 137         return NULL;
 138     }
 139
 140     /* we are going to expand the RLE stuff so that we won't need to read
 141      * nibbles later on. This will speed things up a lot. Plus, we'll only
 142      * need to do this stupid interlacing stuff once.
 143      *
 144      * Rationale for the "p_spudec->i_rle_size * 4*sizeof(*spu_data.p_data)":
 145      *  one byte gaves two nibbles and may be used twice (once per field)
 146      * generating 4 codes.
 147      */
 148     spu_data.p_data = malloc( sizeof(*spu_data.p_data) * 2 * 2 * p_sys->i_rle_size );
 149
 150     /* We try to display it */
 151     if( ParseRLE( p_dec, &spu_data, &spu_properties ) )
 152     {
 153         /* There was a parse error, delete the subpicture */
 154         decoder_DeleteSubpicture( p_dec, p_spu );
 155         free( spu_data.p_data );
 156         return NULL;
 157     }
 158
 159 #ifdef DEBUG_SPUDEC
 160     msg_Dbg( p_dec, "total size: 0x%x, RLE offsets: 0x%x 0x%x",
 161              p_sys->i_spu_size,
 162              spu_data.pi_offset[0], spu_data.pi_offset[1] );
 163 #endif
 164
 165     Render( p_dec, p_spu, &spu_data, &spu_properties );
 166     free( spu_data.p_data );
 167
 168     return p_spu;
 169 }
 170
 171 /*****************************************************************************
 172  * ParseControlSeq: parse all SPU control sequences
 173  *****************************************************************************
 174  * This is the most important part in SPU decoding. We get dates, palette
 175  * information, coordinates, and so on. For more information on the
 176  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 177  *****************************************************************************/
 178 static int ParseControlSeq( decoder_t *p_dec, subpicture_t *p_spu,
 179                             subpicture_data_t *p_spu_data, spu_properties_t *p_spu_properties )
 180 {
 181     decoder_sys_t *p_sys = p_dec->p_sys;
 182
 183     /* Our current index in the SPU packet */
 184     unsigned int i_index = p_sys->i_rle_size + 4;
 185
 186     /* The next start-of-control-sequence index and the previous one */
 187     unsigned int i_next_seq = 0, i_cur_seq = 0;
 188
 189     /* Command and date */
 190     uint8_t i_command = SPU_CMD_END;
 191     mtime_t date = 0;
 192
 193     if( !p_spu || !p_spu_data )
 194         return VLC_EGENERIC;
 195
 196     /* Initialize the structure */
 197     p_spu->i_start = p_spu->i_stop = 0;
 198     p_spu->b_ephemer = false;
 199
 200     for( i_index = 4 + p_sys->i_rle_size; i_index < p_sys->i_spu_size ; )
 201     {
 202         /* If we just read a command sequence, read the next one;
 203          * otherwise, go on with the commands of the current sequence. */
 204         if( i_command == SPU_CMD_END )
 205         {
 206             if( i_index + 4 > p_sys->i_spu_size )
 207             {
 208                 msg_Err( p_dec, "overflow in SPU command sequence" );
 209                 return VLC_EGENERIC;
 210             }
 211
 212             /* Get the control sequence date */
 213             date = (mtime_t)GetWBE( &p_sys->buffer[i_index] ) * 11000;
 214
 215             /* Next offset */
 216             i_cur_seq = i_index;
 217             i_next_seq = GetWBE( &p_sys->buffer[i_index+2] );
 218
 219             if( i_next_seq > p_sys->i_spu_size )
 220             {
 221                 msg_Err( p_dec, "overflow in SPU next command sequence" );
 222                 return VLC_EGENERIC;
 223             }
 224
 225             /* Skip what we just read */
 226             i_index += 4;
 227         }
 228
 229         i_command = p_sys->buffer[i_index];
 230
 231         switch( i_command )
 232         {
 233         case SPU_CMD_FORCE_DISPLAY: /* 00 (force displaying) */
 234             p_spu->i_start = p_spu_data->i_pts + date;
 235             p_spu->b_ephemer = true;
 236             i_index += 1;
 237             break;
 238
 239         /* Convert the dates in seconds to PTS values */
 240         case SPU_CMD_START_DISPLAY: /* 01 (start displaying) */
 241             p_spu->i_start = p_spu_data->i_pts + date;
 242             i_index += 1;
 243             break;
 244
 245         case SPU_CMD_STOP_DISPLAY: /* 02 (stop displaying) */
 246             p_spu->i_stop = p_spu_data->i_pts + date;
 247             i_index += 1;
 248             break;
 249
 250         case SPU_CMD_SET_PALETTE:
 251             /* 03xxxx (palette) */
 252             if( i_index + 3 > p_sys->i_spu_size )
 253             {
 254                 msg_Err( p_dec, "overflow in SPU command" );
 255                 return VLC_EGENERIC;
 256             }
 257
 258             if( p_dec->fmt_in.subs.spu.palette[0] == 0xBeeF )
 259             {
 260                 unsigned int idx[4];
 261                 int i;
 262
 263                 p_spu_data->b_palette = true;
 264
 265                 idx[0] = (p_sys->buffer[i_index+1]>>4)&0x0f;
 266                 idx[1] = (p_sys->buffer[i_index+1])&0x0f;
 267                 idx[2] = (p_sys->buffer[i_index+2]>>4)&0x0f;
 268                 idx[3] = (p_sys->buffer[i_index+2])&0x0f;
 269
 270                 for( i = 0; i < 4 ; i++ )
 271                 {
 272                     uint32_t i_color = p_dec->fmt_in.subs.spu.palette[1+idx[i]];
 273
 274                     /* FIXME: this job should be done sooner */
 275                     p_spu_data->pi_yuv[3-i][0] = (i_color>>16) & 0xff;
 276                     p_spu_data->pi_yuv[3-i][1] = (i_color>>0) & 0xff;
 277                     p_spu_data->pi_yuv[3-i][2] = (i_color>>8) & 0xff;
 278                 }
 279             }
 280
 281             i_index += 3;
 282             break;
 283
 284         case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
 285             if( i_index + 3 > p_sys->i_spu_size )
 286             {
 287                 msg_Err( p_dec, "overflow in SPU command" );
 288                 return VLC_EGENERIC;
 289             }
 290
 291             p_spu_data->pi_alpha[3] = (p_sys->buffer[i_index+1]>>4)&0x0f;
 292             p_spu_data->pi_alpha[2] = (p_sys->buffer[i_index+1])&0x0f;
 293             p_spu_data->pi_alpha[1] = (p_sys->buffer[i_index+2]>>4)&0x0f;
 294             p_spu_data->pi_alpha[0] = (p_sys->buffer[i_index+2])&0x0f;
 295
 296             i_index += 3;
 297             break;
 298
 299         case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
 300             if( i_index + 7 > p_sys->i_spu_size )
 301             {
 302                 msg_Err( p_dec, "overflow in SPU command" );
 303                 return VLC_EGENERIC;
 304             }
 305
 306             p_spu_properties->i_x = (p_sys->buffer[i_index+1]<<4)|
 307                          ((p_sys->buffer[i_index+2]>>4)&0x0f);
 308             p_spu_properties->i_width = (((p_sys->buffer[i_index+2]&0x0f)<<8)|
 309                               p_sys->buffer[i_index+3]) - p_spu_properties->i_x + 1;
 310
 311             p_spu_properties->i_y = (p_sys->buffer[i_index+4]<<4)|
 312                          ((p_sys->buffer[i_index+5]>>4)&0x0f);
 313             p_spu_properties->i_height = (((p_sys->buffer[i_index+5]&0x0f)<<8)|
 314                               p_sys->buffer[i_index+6]) - p_spu_properties->i_y + 1;
 315
 316             /* Auto crop fullscreen subtitles */
 317             if( p_spu_properties->i_height > 250 )
 318                 p_spu_data->b_auto_crop = true;
 319
 320             i_index += 7;
 321             break;
 322
 323         case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
 324             if( i_index + 5 > p_sys->i_spu_size )
 325             {
 326                 msg_Err( p_dec, "overflow in SPU command" );
 327                 return VLC_EGENERIC;
 328             }
 329
 330             p_spu_data->pi_offset[0] = GetWBE(&p_sys->buffer[i_index+1]) - 4;
 331             p_spu_data->pi_offset[1] = GetWBE(&p_sys->buffer[i_index+3]) - 4;
 332             i_index += 5;
 333             break;
 334
 335         case SPU_CMD_END: /* ff (end) */
 336             i_index += 1;
 337             break;
 338
 339         default: /* xx (unknown command) */
 340             msg_Warn( p_dec, "unknown SPU command 0x%.2x", i_command );
 341             if( i_index + 1 < i_next_seq )
 342             {
 343                  /* There is at least one other command sequence */
 344                  if( p_sys->buffer[i_next_seq - 1] == SPU_CMD_END )
 345                  {
 346                      /* This is consistent. Skip to that command sequence. */
 347                      i_index = i_next_seq;
 348                  }
 349                  else
 350                  {
 351                      /* There were other commands. */
 352                      msg_Warn( p_dec, "cannot recover, dropping subtitle" );
 353                      return VLC_EGENERIC;
 354                  }
 355             }
 356             else
 357             {
 358                 /* We were in the last command sequence. Stop parsing by
 359                  * pretending we met an SPU_CMD_END command. */
 360                 i_command = SPU_CMD_END;
 361                 i_index++;
 362             }
 363         }
 364
 365         /* We need to check for quit commands here */
 366         if( !vlc_object_alive (p_dec) )
 367         {
 368             return VLC_EGENERIC;
 369         }
 370
 371         if( i_command == SPU_CMD_END && i_index != i_next_seq )
 372         {
 373             break;
 374         }
 375     }
 376
 377     /* Check that the next sequence index matches the current one */
 378     if( i_next_seq != i_cur_seq )
 379     {
 380         msg_Err( p_dec, "index mismatch (0x%.4x != 0x%.4x)",
 381                  i_next_seq, i_cur_seq );
 382         return VLC_EGENERIC;
 383     }
 384
 385     if( i_index > p_sys->i_spu_size )
 386     {
 387         msg_Err( p_dec, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
 388                  i_index, p_sys->i_spu_size );
 389         return VLC_EGENERIC;
 390     }
 391
 392     if( !p_spu->i_start )
 393     {
 394         msg_Err( p_dec, "no `start display' command" );
 395         return VLC_EGENERIC;
 396     }
 397
 398     if( p_spu->i_stop <= p_spu->i_start && !p_spu->b_ephemer )
 399     {
 400         /* This subtitle will live for 5 seconds or until the next subtitle */
 401         p_spu->i_stop = p_spu->i_start + (mtime_t)500 * 11000;
 402         p_spu->b_ephemer = true;
 403     }
 404
 405     /* Get rid of padding bytes */
 406     if( p_sys->i_spu_size > i_index + 1 )
 407     {
 408         /* Zero or one padding byte are quite usual
 409          * More than one padding byte - this is very strange, but
 410          * we can ignore them. */
 411         msg_Warn( p_dec, "%i padding bytes, we usually get 0 or 1 of them",
 412                   p_sys->i_spu_size - i_index );
 413     }
 414
 415     /* Successfully parsed ! */
 416     return VLC_SUCCESS;
 417 }
 418
 419 /*****************************************************************************
 420  * ParseRLE: parse the RLE part of the subtitle
 421  *****************************************************************************
 422  * This part parses the subtitle graphical data and stores it in a more
 423  * convenient structure for later decoding. For more information on the
 424  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 425  *****************************************************************************/
 426 static int ParseRLE( decoder_t *p_dec,
 427                      subpicture_data_t *p_spu_data,
 428                      const spu_properties_t *p_spu_properties )
 429 {
 430     decoder_sys_t *p_sys = p_dec->p_sys;
 431     uint8_t       *p_src = &p_sys->buffer[4];
 432
 433     unsigned int i_code;
 434
 435     unsigned int i_width = p_spu_properties->i_width;
 436     unsigned int i_height = p_spu_properties->i_height;
 437     unsigned int i_x, i_y;
 438
 439     uint16_t *p_dest = p_spu_data->p_data;
 440
 441     /* The subtitles are interlaced, we need two offsets */
 442     unsigned int  i_id = 0;                   /* Start on the even SPU layer */
 443     unsigned int  pi_table[ 2 ];
 444     unsigned int *pi_offset;
 445
 446     /* Cropping */
 447     bool b_empty_top = true;
 448     unsigned int i_skipped_top = 0, i_skipped_bottom = 0;
 449     unsigned int i_transparent_code = 0;
 450
 451     /* Colormap statistics */
 452     int i_border = -1;
 453     int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
 454
 455     pi_table[ 0 ] = p_spu_data->pi_offset[ 0 ] << 1;
 456     pi_table[ 1 ] = p_spu_data->pi_offset[ 1 ] << 1;
 457
 458     for( i_y = 0 ; i_y < i_height ; i_y++ )
 459     {
 460         pi_offset = pi_table + i_id;
 461
 462         for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
 463         {
 464             i_code = AddNibble( 0, p_src, pi_offset );
 465
 466             if( i_code < 0x04 )
 467             {
 468                 i_code = AddNibble( i_code, p_src, pi_offset );
 469
 470                 if( i_code < 0x10 )
 471                 {
 472                     i_code = AddNibble( i_code, p_src, pi_offset );
 473
 474                     if( i_code < 0x040 )
 475                     {
 476                         i_code = AddNibble( i_code, p_src, pi_offset );
 477
 478                         if( i_code < 0x0100 )
 479                         {
 480                             /* If the 14 first bits are set to 0, then it's a
 481                              * new line. We emulate it. */
 482                             if( i_code < 0x0004 )
 483                             {
 484                                 i_code |= ( i_width - i_x ) << 2;
 485                             }
 486                             else
 487                             {
 488                                 /* We have a boo boo ! */
 489                                 msg_Err( p_dec, "unknown RLE code "
 490                                          "0x%.4x", i_code );
 491                                 return VLC_EGENERIC;
 492                             }
 493                         }
 494                     }
 495                 }
 496             }
 497
 498             if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
 499             {
 500                 msg_Err( p_dec, "out of bounds, %i at (%i,%i) is out of %ix%i",
 501                          i_code >> 2, i_x, i_y, i_width, i_height );
 502                 return VLC_EGENERIC;
 503             }
 504
 505             /* Try to find the border color */
 506             if( p_spu_data->pi_alpha[ i_code & 0x3 ] != 0x00 )
 507             {
 508                 i_border = i_code & 0x3;
 509                 stats[i_border] += i_code >> 2;
 510             }
 511
 512             /* Auto crop subtitles (a lot more optimized) */
 513             if( p_spu_data->b_auto_crop )
 514             {
 515                 if( !i_y )
 516                 {
 517                     /* We assume that if the first line is transparent, then
 518                      * it is using the palette index for the
 519                      * (background) transparent color */
 520                     if( (i_code >> 2) == i_width &&
 521                         p_spu_data->pi_alpha[ i_code & 0x3 ] == 0x00 )
 522                     {
 523                         i_transparent_code = i_code;
 524                     }
 525                     else
 526                     {
 527                         p_spu_data->b_auto_crop = false;
 528                     }
 529                 }
 530
 531                 if( i_code == i_transparent_code )
 532                 {
 533                     if( b_empty_top )
 534                     {
 535                         /* This is a blank top line, we skip it */
 536                       i_skipped_top++;
 537                     }
 538                     else
 539                     {
 540                         /* We can't be sure the current lines will be skipped,
 541                          * so we store the code just in case. */
 542                       *p_dest++ = i_code;
 543                       i_skipped_bottom++;
 544                     }
 545                 }
 546                 else
 547                 {
 548                     /* We got a valid code, store it */
 549                     *p_dest++ = i_code;
 550
 551                     /* Valid code means no blank line */
 552                     b_empty_top = false;
 553                     i_skipped_bottom = 0;
 554                 }
 555             }
 556             else
 557             {
 558                 *p_dest++ = i_code;
 559             }
 560         }
 561
 562         /* Check that we didn't go too far */
 563         if( i_x > i_width )
 564         {
 565             msg_Err( p_dec, "i_x overflowed, %i > %i", i_x, i_width );
 566             return VLC_EGENERIC;
 567         }
 568
 569         /* Byte-align the stream */
 570         if( *pi_offset & 0x1 )
 571         {
 572             (*pi_offset)++;
 573         }
 574
 575         /* Swap fields */
 576         i_id = ~i_id & 0x1;
 577     }
 578
 579     /* We shouldn't get any padding bytes */
 580     if( i_y < i_height )
 581     {
 582         msg_Err( p_dec, "padding bytes found in RLE sequence" );
 583         msg_Err( p_dec, "send mail to <sam@zoy.org> if you "
 584                         "want to help debugging this" );
 585
 586         /* Skip them just in case */
 587         while( i_y < i_height )
 588         {
 589             *p_dest++ = i_width << 2;
 590             i_y++;
 591         }
 592
 593         return VLC_EGENERIC;
 594     }
 595
 596 #ifdef DEBUG_SPUDEC
 597     msg_Dbg( p_dec, "valid subtitle, size: %ix%i, position: %i,%i",
 598              p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 599 #endif
 600
 601     /* Crop if necessary */
 602     if( i_skipped_top || i_skipped_bottom )
 603     {
 604 #ifdef DEBUG_SPUDEC
 605         int i_y = p_spu->i_y + i_skipped_top;
 606         int i_height = p_spu->i_height - (i_skipped_top + i_skipped_bottom);
 607 #endif
 608         p_spu_data->i_y_top_offset = i_skipped_top;
 609         p_spu_data->i_y_bottom_offset = i_skipped_bottom;
 610 #ifdef DEBUG_SPUDEC
 611         msg_Dbg( p_dec, "cropped to: %ix%i, position: %i,%i",
 612                  p_spu->i_width, i_height, p_spu->i_x, i_y );
 613 #endif
 614     }
 615
 616     /* Handle color if no palette was found */
 617     if( !p_spu_data->b_palette )
 618     {
 619         int i, i_inner = -1, i_shade = -1;
 620
 621         /* Set the border color */
 622         p_spu_data->pi_yuv[i_border][0] = 0x00;
 623         p_spu_data->pi_yuv[i_border][1] = 0x80;
 624         p_spu_data->pi_yuv[i_border][2] = 0x80;
 625         stats[i_border] = 0;
 626
 627         /* Find the inner colors */
 628         for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
 629         {
 630             if( stats[i] )
 631             {
 632                 i_inner = i;
 633             }
 634         }
 635
 636         for(       ; i < 4 && i_shade == -1 ; i++ )
 637         {
 638             if( stats[i] )
 639             {
 640                 if( stats[i] > stats[i_inner] )
 641                 {
 642                     i_shade = i_inner;
 643                     i_inner = i;
 644                 }
 645                 else
 646                 {
 647                     i_shade = i;
 648                 }
 649             }
 650         }
 651
 652         /* Set the inner color */
 653         if( i_inner != -1 )
 654         {
 655             p_spu_data->pi_yuv[i_inner][0] = 0xff;
 656             p_spu_data->pi_yuv[i_inner][1] = 0x80;
 657             p_spu_data->pi_yuv[i_inner][2] = 0x80;
 658         }
 659
 660         /* Set the anti-aliasing color */
 661         if( i_shade != -1 )
 662         {
 663             p_spu_data->pi_yuv[i_shade][0] = 0x80;
 664             p_spu_data->pi_yuv[i_shade][1] = 0x80;
 665             p_spu_data->pi_yuv[i_shade][2] = 0x80;
 666         }
 667
 668 #ifdef DEBUG_SPUDEC
 669         msg_Dbg( p_dec, "using custom palette (border %i, inner %i, shade %i)",
 670                  i_border, i_inner, i_shade );
 671 #endif
 672     }
 673
 674     return VLC_SUCCESS;
 675 }
 676
 677 static void Render( decoder_t *p_dec, subpicture_t *p_spu,
 678                     subpicture_data_t *p_spu_data,
 679                     const spu_properties_t *p_spu_properties )
 680 {
 681     uint8_t *p_p;
 682     int i_x, i_y, i_len, i_color, i_pitch;
 683     const uint16_t *p_source = p_spu_data->p_data;
 684     video_format_t fmt;
 685     video_palette_t palette;
 686
 687     /* Create a new subpicture region */
 688     memset( &fmt, 0, sizeof(video_format_t) );
 689     fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
 690     fmt.i_aspect = 0; /* 0 means use aspect ratio of background video */
 691     fmt.i_width = fmt.i_visible_width = p_spu_properties->i_width;
 692     fmt.i_height = fmt.i_visible_height = p_spu_properties->i_height -
 693         p_spu_data->i_y_top_offset - p_spu_data->i_y_bottom_offset;
 694     fmt.i_x_offset = fmt.i_y_offset = 0;
 695     fmt.p_palette = &palette;
 696     fmt.p_palette->i_entries = 4;
 697     for( i_x = 0; i_x < fmt.p_palette->i_entries; i_x++ )
 698     {
 699         fmt.p_palette->palette[i_x][0] = p_spu_data->pi_yuv[i_x][0];
 700         fmt.p_palette->palette[i_x][1] = p_spu_data->pi_yuv[i_x][1];
 701         fmt.p_palette->palette[i_x][2] = p_spu_data->pi_yuv[i_x][2];
 702         fmt.p_palette->palette[i_x][3] =
 703             p_spu_data->pi_alpha[i_x] == 0xf ? 0xff :
 704             p_spu_data->pi_alpha[i_x] << 4;
 705     }
 706
 707     p_spu->p_region = subpicture_region_New( &fmt );
 708     if( !p_spu->p_region )
 709     {
 710         msg_Err( p_dec, "cannot allocate SPU region" );
 711         return;
 712     }
 713
 714     p_spu->p_region->i_x = p_spu_properties->i_x;
 715     p_spu->p_region->i_y = p_spu_properties->i_y + p_spu_data->i_y_top_offset;
 716     p_p = p_spu->p_region->p_picture->p->p_pixels;
 717     i_pitch = p_spu->p_region->p_picture->p->i_pitch;
 718
 719     /* Draw until we reach the bottom of the subtitle */
 720     for( i_y = 0; i_y < (int)fmt.i_height * i_pitch; i_y += i_pitch )
 721     {
 722         /* Draw until we reach the end of the line */
 723         for( i_x = 0 ; i_x < (int)fmt.i_width; i_x += i_len )
 724         {
 725             /* Get the RLE part, then draw the line */
 726             i_color = *p_source & 0x3;
 727             i_len = *p_source++ >> 2;
 728             memset( p_p + i_x + i_y, i_color, i_len );
 729         }
 730     }
 731 }