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