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