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     int   pi_offset[2];                              /* byte offsets to data */
  54     uint16_t *p_data;
  55
  56     /* Color information */
  57     bool b_palette;
  58     uint8_t    pi_alpha[4];
  59     uint8_t    pi_yuv[4][3];
  60
  61     /* Auto crop fullscreen subtitles */
  62     bool b_auto_crop;
  63     int i_y_top_offset;
  64     int i_y_bottom_offset;
  65
  66 } subpicture_data_t;
  67
  68 static int  ParseControlSeq( decoder_t *, subpicture_t *, subpicture_data_t *,
  69                              spu_properties_t *, mtime_t i_pts );
  70 static int  ParseRLE       ( decoder_t *, subpicture_data_t *,
  71                              const spu_properties_t * );
  72 static void Render         ( decoder_t *, subpicture_t *, subpicture_data_t *,
  73                              const spu_properties_t * );
  74
  75 /*****************************************************************************
  76  * AddNibble: read a nibble from a source packet and add it to our integer.
  77  *****************************************************************************/
  78 static inline unsigned int AddNibble( unsigned int i_code,
  79                                       const uint8_t *p_src, unsigned int *pi_index )
  80 {
  81     if( *pi_index & 0x1 )
  82     {
  83         return( i_code << 4 | ( p_src[(*pi_index)++ >> 1] & 0xf ) );
  84     }
  85     else
  86     {
  87         return( i_code << 4 | p_src[(*pi_index)++ >> 1] >> 4 );
  88     }
  89 }
  90
  91 /*****************************************************************************
  92  * ParsePacket: parse an SPU packet and send it to the video output
  93  *****************************************************************************
  94  * This function parses the SPU packet and, if valid, sends it to the
  95  * video output.
  96  *****************************************************************************/
  97 subpicture_t * ParsePacket( decoder_t *p_dec )
  98 {
  99     decoder_sys_t *p_sys = p_dec->p_sys;
 100     subpicture_t *p_spu;
 101     subpicture_data_t spu_data;
 102     spu_properties_t spu_properties;
 103
 104     /* Allocate the subpicture internal data. */
 105     p_spu = decoder_NewSubpicture( p_dec );
 106     if( !p_spu ) return NULL;
 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     /* Getting the control part */
 114     if( ParseControlSeq( p_dec, p_spu, &spu_data, &spu_properties, p_sys->i_pts ) )
 115     {
 116         /* There was a parse error, delete the subpicture */
 117         decoder_DeleteSubpicture( p_dec, p_spu );
 118         return NULL;
 119     }
 120
 121     /* we are going to expand the RLE stuff so that we won't need to read
 122      * nibbles later on. This will speed things up a lot. Plus, we'll only
 123      * need to do this stupid interlacing stuff once.
 124      *
 125      * Rationale for the "p_spudec->i_rle_size * 4*sizeof(*spu_data.p_data)":
 126      *  one byte gaves two nibbles and may be used twice (once per field)
 127      * generating 4 codes.
 128      */
 129     spu_data.p_data = malloc( sizeof(*spu_data.p_data) * 2 * 2 * p_sys->i_rle_size );
 130
 131     /* We try to display it */
 132     if( ParseRLE( p_dec, &spu_data, &spu_properties ) )
 133     {
 134         /* There was a parse error, delete the subpicture */
 135         decoder_DeleteSubpicture( p_dec, p_spu );
 136         free( spu_data.p_data );
 137         return NULL;
 138     }
 139
 140 #ifdef DEBUG_SPUDEC
 141     msg_Dbg( p_dec, "total size: 0x%x, RLE offsets: 0x%x 0x%x",
 142              p_sys->i_spu_size,
 143              spu_data.pi_offset[0], spu_data.pi_offset[1] );
 144 #endif
 145
 146     Render( p_dec, p_spu, &spu_data, &spu_properties );
 147     free( spu_data.p_data );
 148
 149     return p_spu;
 150 }
 151
 152 /*****************************************************************************
 153  * ParseControlSeq: parse all SPU control sequences
 154  *****************************************************************************
 155  * This is the most important part in SPU decoding. We get dates, palette
 156  * information, coordinates, and so on. For more information on the
 157  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 158  *****************************************************************************/
 159 static int ParseControlSeq( decoder_t *p_dec, subpicture_t *p_spu,
 160                             subpicture_data_t *p_spu_data, spu_properties_t *p_spu_properties, mtime_t i_pts )
 161 {
 162     decoder_sys_t *p_sys = p_dec->p_sys;
 163
 164     /* Our current index in the SPU packet */
 165     unsigned int i_index = p_sys->i_rle_size + 4;
 166
 167     /* The next start-of-control-sequence index and the previous one */
 168     unsigned int i_next_seq = 0, i_cur_seq = 0;
 169
 170     /* Command and date */
 171     uint8_t i_command = SPU_CMD_END;
 172     mtime_t date = 0;
 173
 174     if( !p_spu || !p_spu_data )
 175         return VLC_EGENERIC;
 176
 177     /* Initialize the structure */
 178     p_spu->i_start = p_spu->i_stop = 0;
 179     p_spu->b_ephemer = false;
 180
 181     memset( p_spu_properties, 0, sizeof(*p_spu_properties) );
 182
 183     /* */
 184     p_spu_data->pi_offset[0] = -1;
 185     p_spu_data->pi_offset[1] = -1;
 186     p_spu_data->p_data = NULL;
 187     p_spu_data->b_palette = false;
 188     p_spu_data->b_auto_crop = false;
 189     p_spu_data->i_y_top_offset = 0;
 190     p_spu_data->i_y_bottom_offset = 0;
 191
 192     p_spu_data->pi_alpha[0] = 0x00;
 193     p_spu_data->pi_alpha[1] = 0x0f;
 194     p_spu_data->pi_alpha[2] = 0x0f;
 195     p_spu_data->pi_alpha[3] = 0x0f;
 196
 197     for( i_index = 4 + p_sys->i_rle_size; i_index < p_sys->i_spu_size ; )
 198     {
 199         /* If we just read a command sequence, read the next one;
 200          * otherwise, go on with the commands of the current sequence. */
 201         if( i_command == SPU_CMD_END )
 202         {
 203             if( i_index + 4 > p_sys->i_spu_size )
 204             {
 205                 msg_Err( p_dec, "overflow in SPU command sequence" );
 206                 return VLC_EGENERIC;
 207             }
 208
 209             /* Get the control sequence date */
 210             date = (mtime_t)GetWBE( &p_sys->buffer[i_index] ) * 11000;
 211
 212             /* Next offset */
 213             i_cur_seq = i_index;
 214             i_next_seq = GetWBE( &p_sys->buffer[i_index+2] );
 215
 216             if( i_next_seq > p_sys->i_spu_size )
 217             {
 218                 msg_Err( p_dec, "overflow in SPU next command sequence" );
 219                 return VLC_EGENERIC;
 220             }
 221
 222             /* Skip what we just read */
 223             i_index += 4;
 224         }
 225
 226         i_command = p_sys->buffer[i_index];
 227
 228         switch( i_command )
 229         {
 230         case SPU_CMD_FORCE_DISPLAY: /* 00 (force displaying) */
 231             p_spu->i_start = i_pts + date;
 232             p_spu->b_ephemer = true;
 233             i_index += 1;
 234             break;
 235
 236         /* Convert the dates in seconds to PTS values */
 237         case SPU_CMD_START_DISPLAY: /* 01 (start displaying) */
 238             p_spu->i_start = i_pts + date;
 239             i_index += 1;
 240             break;
 241
 242         case SPU_CMD_STOP_DISPLAY: /* 02 (stop displaying) */
 243             p_spu->i_stop = i_pts + date;
 244             i_index += 1;
 245             break;
 246
 247         case SPU_CMD_SET_PALETTE:
 248             /* 03xxxx (palette) */
 249             if( i_index + 3 > p_sys->i_spu_size )
 250             {
 251                 msg_Err( p_dec, "overflow in SPU command" );
 252                 return VLC_EGENERIC;
 253             }
 254
 255             if( p_dec->fmt_in.subs.spu.palette[0] == 0xBeeF )
 256             {
 257                 unsigned int idx[4];
 258                 int i;
 259
 260                 p_spu_data->b_palette = true;
 261
 262                 idx[0] = (p_sys->buffer[i_index+1]>>4)&0x0f;
 263                 idx[1] = (p_sys->buffer[i_index+1])&0x0f;
 264                 idx[2] = (p_sys->buffer[i_index+2]>>4)&0x0f;
 265                 idx[3] = (p_sys->buffer[i_index+2])&0x0f;
 266
 267                 for( i = 0; i < 4 ; i++ )
 268                 {
 269                     uint32_t i_color = p_dec->fmt_in.subs.spu.palette[1+idx[i]];
 270
 271                     /* FIXME: this job should be done sooner */
 272                     p_spu_data->pi_yuv[3-i][0] = (i_color>>16) & 0xff;
 273                     p_spu_data->pi_yuv[3-i][1] = (i_color>>0) & 0xff;
 274                     p_spu_data->pi_yuv[3-i][2] = (i_color>>8) & 0xff;
 275                 }
 276             }
 277
 278             i_index += 3;
 279             break;
 280
 281         case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
 282             if( i_index + 3 > p_sys->i_spu_size )
 283             {
 284                 msg_Err( p_dec, "overflow in SPU command" );
 285                 return VLC_EGENERIC;
 286             }
 287
 288             p_spu_data->pi_alpha[3] = (p_sys->buffer[i_index+1]>>4)&0x0f;
 289             p_spu_data->pi_alpha[2] = (p_sys->buffer[i_index+1])&0x0f;
 290             p_spu_data->pi_alpha[1] = (p_sys->buffer[i_index+2]>>4)&0x0f;
 291             p_spu_data->pi_alpha[0] = (p_sys->buffer[i_index+2])&0x0f;
 292
 293             i_index += 3;
 294             break;
 295
 296         case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
 297             if( i_index + 7 > p_sys->i_spu_size )
 298             {
 299                 msg_Err( p_dec, "overflow in SPU command" );
 300                 return VLC_EGENERIC;
 301             }
 302
 303             p_spu_properties->i_x = (p_sys->buffer[i_index+1]<<4)|
 304                          ((p_sys->buffer[i_index+2]>>4)&0x0f);
 305             p_spu_properties->i_width = (((p_sys->buffer[i_index+2]&0x0f)<<8)|
 306                               p_sys->buffer[i_index+3]) - p_spu_properties->i_x + 1;
 307
 308             p_spu_properties->i_y = (p_sys->buffer[i_index+4]<<4)|
 309                          ((p_sys->buffer[i_index+5]>>4)&0x0f);
 310             p_spu_properties->i_height = (((p_sys->buffer[i_index+5]&0x0f)<<8)|
 311                               p_sys->buffer[i_index+6]) - p_spu_properties->i_y + 1;
 312
 313             /* Auto crop fullscreen subtitles */
 314             if( p_spu_properties->i_height > 250 )
 315                 p_spu_data->b_auto_crop = true;
 316
 317             i_index += 7;
 318             break;
 319
 320         case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
 321             if( i_index + 5 > p_sys->i_spu_size )
 322             {
 323                 msg_Err( p_dec, "overflow in SPU command" );
 324                 return VLC_EGENERIC;
 325             }
 326
 327             p_spu_data->pi_offset[0] = GetWBE(&p_sys->buffer[i_index+1]) - 4;
 328             p_spu_data->pi_offset[1] = GetWBE(&p_sys->buffer[i_index+3]) - 4;
 329             i_index += 5;
 330             break;
 331
 332         case SPU_CMD_END: /* ff (end) */
 333             i_index += 1;
 334             break;
 335
 336         default: /* xx (unknown command) */
 337             msg_Warn( p_dec, "unknown SPU command 0x%.2x", i_command );
 338             if( i_index + 1 < i_next_seq )
 339             {
 340                  /* There is at least one other command sequence */
 341                  if( p_sys->buffer[i_next_seq - 1] == SPU_CMD_END )
 342                  {
 343                      /* This is consistent. Skip to that command sequence. */
 344                      i_index = i_next_seq;
 345                  }
 346                  else
 347                  {
 348                      /* There were other commands. */
 349                      msg_Warn( p_dec, "cannot recover, dropping subtitle" );
 350                      return VLC_EGENERIC;
 351                  }
 352             }
 353             else
 354             {
 355                 /* We were in the last command sequence. Stop parsing by
 356                  * pretending we met an SPU_CMD_END command. */
 357                 i_command = SPU_CMD_END;
 358                 i_index++;
 359             }
 360         }
 361
 362         /* We need to check for quit commands here */
 363         if( !vlc_object_alive (p_dec) )
 364         {
 365             return VLC_EGENERIC;
 366         }
 367
 368         if( i_command == SPU_CMD_END && i_index != i_next_seq )
 369         {
 370             break;
 371         }
 372     }
 373
 374     /* Check that the next sequence index matches the current one */
 375     if( i_next_seq != i_cur_seq )
 376     {
 377         msg_Err( p_dec, "index mismatch (0x%.4x != 0x%.4x)",
 378                  i_next_seq, i_cur_seq );
 379         return VLC_EGENERIC;
 380     }
 381
 382     if( i_index > p_sys->i_spu_size )
 383     {
 384         msg_Err( p_dec, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
 385                  i_index, p_sys->i_spu_size );
 386         return VLC_EGENERIC;
 387     }
 388
 389     const int i_spu_size = p_sys->i_spu - 4;
 390     if( p_spu_data->pi_offset[0] < 0 || p_spu_data->pi_offset[0] >= i_spu_size ||
 391         p_spu_data->pi_offset[1] < 0 || p_spu_data->pi_offset[1] >= i_spu_size )
 392     {
 393         msg_Err( p_dec, "invalid offset values" );
 394         return VLC_EGENERIC;
 395     }
 396
 397     if( !p_spu->i_start )
 398     {
 399         msg_Err( p_dec, "no `start display' command" );
 400         return VLC_EGENERIC;
 401     }
 402
 403     if( p_spu->i_stop <= p_spu->i_start && !p_spu->b_ephemer )
 404     {
 405         /* This subtitle will live for 5 seconds or until the next subtitle */
 406         p_spu->i_stop = p_spu->i_start + (mtime_t)500 * 11000;
 407         p_spu->b_ephemer = true;
 408     }
 409
 410     /* Get rid of padding bytes */
 411     if( p_sys->i_spu_size > i_index + 1 )
 412     {
 413         /* Zero or one padding byte are quite usual
 414          * More than one padding byte - this is very strange, but
 415          * we can ignore them. */
 416         msg_Warn( p_dec, "%i padding bytes, we usually get 0 or 1 of them",
 417                   p_sys->i_spu_size - i_index );
 418     }
 419
 420     /* Successfully parsed ! */
 421     return VLC_SUCCESS;
 422 }
 423
 424 /*****************************************************************************
 425  * ParseRLE: parse the RLE part of the subtitle
 426  *****************************************************************************
 427  * This part parses the subtitle graphical data and stores it in a more
 428  * convenient structure for later decoding. For more information on the
 429  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 430  *****************************************************************************/
 431 static int ParseRLE( decoder_t *p_dec,
 432                      subpicture_data_t *p_spu_data,
 433                      const spu_properties_t *p_spu_properties )
 434 {
 435     decoder_sys_t *p_sys = p_dec->p_sys;
 436
 437     const unsigned int i_width = p_spu_properties->i_width;
 438     const unsigned int i_height = p_spu_properties->i_height;
 439     unsigned int i_x, i_y;
 440
 441     uint16_t *p_dest = p_spu_data->p_data;
 442
 443     /* The subtitles are interlaced, we need two offsets */
 444     unsigned int  i_id = 0;                   /* Start on the even SPU layer */
 445     unsigned int  pi_table[ 2 ];
 446     unsigned int *pi_offset;
 447
 448     /* Cropping */
 449     bool b_empty_top = true;
 450     unsigned int i_skipped_top = 0, i_skipped_bottom = 0;
 451     unsigned int i_transparent_code = 0;
 452
 453     /* Colormap statistics */
 454     int i_border = -1;
 455     int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
 456
 457     pi_table[ 0 ] = p_spu_data->pi_offset[ 0 ] << 1;
 458     pi_table[ 1 ] = p_spu_data->pi_offset[ 1 ] << 1;
 459
 460     for( i_y = 0 ; i_y < i_height ; i_y++ )
 461     {
 462         unsigned int i_code;
 463         pi_offset = pi_table + i_id;
 464
 465         for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
 466         {
 467             i_code = 0;
 468             for( unsigned int i_min = 1; i_min <= 0x40 && i_code < i_min; i_min <<= 2 )
 469             {
 470                 if( (*pi_offset >> 1) >= p_sys->i_spu_size )
 471                 {
 472                     msg_Err( p_dec, "out of bounds while reading rle" );
 473                     return VLC_EGENERIC;
 474                 }
 475                 i_code = AddNibble( i_code, &p_sys->buffer[4], pi_offset );
 476             }
 477             if( i_code < 0x0004 )
 478             {
 479                 /* If the 14 first bits are set to 0, then it's a
 480                  * new line. We emulate it. */
 481                 i_code |= ( i_width - i_x ) << 2;
 482             }
 483
 484             if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
 485             {
 486                 msg_Err( p_dec, "out of bounds, %i at (%i,%i) is out of %ix%i",
 487                          i_code >> 2, i_x, i_y, i_width, i_height );
 488                 return VLC_EGENERIC;
 489             }
 490
 491             /* Try to find the border color */
 492             if( p_spu_data->pi_alpha[ i_code & 0x3 ] != 0x00 )
 493             {
 494                 i_border = i_code & 0x3;
 495                 stats[i_border] += i_code >> 2;
 496             }
 497
 498             /* Auto crop subtitles (a lot more optimized) */
 499             if( p_spu_data->b_auto_crop )
 500             {
 501                 if( !i_y )
 502                 {
 503                     /* We assume that if the first line is transparent, then
 504                      * it is using the palette index for the
 505                      * (background) transparent color */
 506                     if( (i_code >> 2) == i_width &&
 507                         p_spu_data->pi_alpha[ i_code & 0x3 ] == 0x00 )
 508                     {
 509                         i_transparent_code = i_code;
 510                     }
 511                     else
 512                     {
 513                         p_spu_data->b_auto_crop = false;
 514                     }
 515                 }
 516
 517                 if( i_code == i_transparent_code )
 518                 {
 519                     if( b_empty_top )
 520                     {
 521                         /* This is a blank top line, we skip it */
 522                       i_skipped_top++;
 523                     }
 524                     else
 525                     {
 526                         /* We can't be sure the current lines will be skipped,
 527                          * so we store the code just in case. */
 528                       *p_dest++ = i_code;
 529                       i_skipped_bottom++;
 530                     }
 531                 }
 532                 else
 533                 {
 534                     /* We got a valid code, store it */
 535                     *p_dest++ = i_code;
 536
 537                     /* Valid code means no blank line */
 538                     b_empty_top = false;
 539                     i_skipped_bottom = 0;
 540                 }
 541             }
 542             else
 543             {
 544                 *p_dest++ = i_code;
 545             }
 546         }
 547
 548         /* Check that we didn't go too far */
 549         if( i_x > i_width )
 550         {
 551             msg_Err( p_dec, "i_x overflowed, %i > %i", i_x, i_width );
 552             return VLC_EGENERIC;
 553         }
 554
 555         /* Byte-align the stream */
 556         if( *pi_offset & 0x1 )
 557         {
 558             (*pi_offset)++;
 559         }
 560
 561         /* Swap fields */
 562         i_id = ~i_id & 0x1;
 563     }
 564
 565     /* We shouldn't get any padding bytes */
 566     if( i_y < i_height )
 567     {
 568         msg_Err( p_dec, "padding bytes found in RLE sequence" );
 569         msg_Err( p_dec, "send mail to <sam@zoy.org> if you "
 570                         "want to help debugging this" );
 571
 572         /* Skip them just in case */
 573         while( i_y < i_height )
 574         {
 575             *p_dest++ = i_width << 2;
 576             i_y++;
 577         }
 578
 579         return VLC_EGENERIC;
 580     }
 581
 582 #ifdef DEBUG_SPUDEC
 583     msg_Dbg( p_dec, "valid subtitle, size: %ix%i, position: %i,%i",
 584              p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 585 #endif
 586
 587     /* Crop if necessary */
 588     if( i_skipped_top || i_skipped_bottom )
 589     {
 590 #ifdef DEBUG_SPUDEC
 591         int i_y = p_spu->i_y + i_skipped_top;
 592         int i_height = p_spu->i_height - (i_skipped_top + i_skipped_bottom);
 593 #endif
 594         p_spu_data->i_y_top_offset = i_skipped_top;
 595         p_spu_data->i_y_bottom_offset = i_skipped_bottom;
 596 #ifdef DEBUG_SPUDEC
 597         msg_Dbg( p_dec, "cropped to: %ix%i, position: %i,%i",
 598                  p_spu->i_width, i_height, p_spu->i_x, i_y );
 599 #endif
 600     }
 601
 602     /* Handle color if no palette was found */
 603     if( !p_spu_data->b_palette )
 604     {
 605         int i, i_inner = -1, i_shade = -1;
 606
 607         /* Set the border color */
 608         p_spu_data->pi_yuv[i_border][0] = 0x00;
 609         p_spu_data->pi_yuv[i_border][1] = 0x80;
 610         p_spu_data->pi_yuv[i_border][2] = 0x80;
 611         stats[i_border] = 0;
 612
 613         /* Find the inner colors */
 614         for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
 615         {
 616             if( stats[i] )
 617             {
 618                 i_inner = i;
 619             }
 620         }
 621
 622         for(       ; i < 4 && i_shade == -1 ; i++ )
 623         {
 624             if( stats[i] )
 625             {
 626                 if( stats[i] > stats[i_inner] )
 627                 {
 628                     i_shade = i_inner;
 629                     i_inner = i;
 630                 }
 631                 else
 632                 {
 633                     i_shade = i;
 634                 }
 635             }
 636         }
 637
 638         /* Set the inner color */
 639         if( i_inner != -1 )
 640         {
 641             p_spu_data->pi_yuv[i_inner][0] = 0xff;
 642             p_spu_data->pi_yuv[i_inner][1] = 0x80;
 643             p_spu_data->pi_yuv[i_inner][2] = 0x80;
 644         }
 645
 646         /* Set the anti-aliasing color */
 647         if( i_shade != -1 )
 648         {
 649             p_spu_data->pi_yuv[i_shade][0] = 0x80;
 650             p_spu_data->pi_yuv[i_shade][1] = 0x80;
 651             p_spu_data->pi_yuv[i_shade][2] = 0x80;
 652         }
 653
 654 #ifdef DEBUG_SPUDEC
 655         msg_Dbg( p_dec, "using custom palette (border %i, inner %i, shade %i)",
 656                  i_border, i_inner, i_shade );
 657 #endif
 658     }
 659
 660     return VLC_SUCCESS;
 661 }
 662
 663 static void Render( decoder_t *p_dec, subpicture_t *p_spu,
 664                     subpicture_data_t *p_spu_data,
 665                     const spu_properties_t *p_spu_properties )
 666 {
 667     uint8_t *p_p;
 668     int i_x, i_y, i_len, i_color, i_pitch;
 669     const uint16_t *p_source = p_spu_data->p_data;
 670     video_format_t fmt;
 671     video_palette_t palette;
 672
 673     /* Create a new subpicture region */
 674     memset( &fmt, 0, sizeof(video_format_t) );
 675     fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
 676     fmt.i_aspect = 0; /* 0 means use aspect ratio of background video */
 677     fmt.i_width = fmt.i_visible_width = p_spu_properties->i_width;
 678     fmt.i_height = fmt.i_visible_height = p_spu_properties->i_height -
 679         p_spu_data->i_y_top_offset - p_spu_data->i_y_bottom_offset;
 680     fmt.i_x_offset = fmt.i_y_offset = 0;
 681     fmt.p_palette = &palette;
 682     fmt.p_palette->i_entries = 4;
 683     for( i_x = 0; i_x < fmt.p_palette->i_entries; i_x++ )
 684     {
 685         fmt.p_palette->palette[i_x][0] = p_spu_data->pi_yuv[i_x][0];
 686         fmt.p_palette->palette[i_x][1] = p_spu_data->pi_yuv[i_x][1];
 687         fmt.p_palette->palette[i_x][2] = p_spu_data->pi_yuv[i_x][2];
 688         fmt.p_palette->palette[i_x][3] =
 689             p_spu_data->pi_alpha[i_x] == 0xf ? 0xff :
 690             p_spu_data->pi_alpha[i_x] << 4;
 691     }
 692
 693     p_spu->p_region = subpicture_region_New( &fmt );
 694     if( !p_spu->p_region )
 695     {
 696         msg_Err( p_dec, "cannot allocate SPU region" );
 697         return;
 698     }
 699
 700     p_spu->p_region->i_x = p_spu_properties->i_x;
 701     p_spu->p_region->i_y = p_spu_properties->i_y + p_spu_data->i_y_top_offset;
 702     p_p = p_spu->p_region->p_picture->p->p_pixels;
 703     i_pitch = p_spu->p_region->p_picture->p->i_pitch;
 704
 705     /* Draw until we reach the bottom of the subtitle */
 706     for( i_y = 0; i_y < (int)fmt.i_height * i_pitch; i_y += i_pitch )
 707     {
 708         /* Draw until we reach the end of the line */
 709         for( i_x = 0 ; i_x < (int)fmt.i_width; i_x += i_len )
 710         {
 711             /* Get the RLE part, then draw the line */
 712             i_color = *p_source & 0x3;
 713             i_len = *p_source++ >> 2;
 714             memset( p_p + i_x + i_y, i_color, i_len );
 715         }
 716     }
 717 }