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     int   pi_offset[2];                              /* byte offsets to data */
  53     uint16_t *p_data;
  54
  55     /* Color information */
  56     bool b_palette;
  57     uint8_t    pi_alpha[4];
  58     uint8_t    pi_yuv[4][3];
  59
  60     /* Auto crop fullscreen subtitles */
  61     bool b_auto_crop;
  62     int i_y_top_offset;
  63     int i_y_bottom_offset;
  64
  65 } subpicture_data_t;
  66
  67 static int  ParseControlSeq( decoder_t *, subpicture_t *, subpicture_data_t *,
  68                              spu_properties_t *, mtime_t i_pts );
  69 static int  ParseRLE       ( decoder_t *, subpicture_data_t *,
  70                              const spu_properties_t * );
  71 static void Render         ( decoder_t *, subpicture_t *, subpicture_data_t *,
  72                              const spu_properties_t * );
  73
  74 /*****************************************************************************
  75  * AddNibble: read a nibble from a source packet and add it to our integer.
  76  *****************************************************************************/
  77 static inline unsigned int AddNibble( unsigned int i_code,
  78                                       const uint8_t *p_src, unsigned int *pi_index )
  79 {
  80     if( *pi_index & 0x1 )
  81     {
  82         return( i_code << 4 | ( p_src[(*pi_index)++ >> 1] & 0xf ) );
  83     }
  84     else
  85     {
  86         return( i_code << 4 | p_src[(*pi_index)++ >> 1] >> 4 );
  87     }
  88 }
  89
  90 /*****************************************************************************
  91  * ParsePacket: parse an SPU packet and send it to the video output
  92  *****************************************************************************
  93  * This function parses the SPU packet and, if valid, sends it to the
  94  * video output.
  95  *****************************************************************************/
  96 subpicture_t * ParsePacket( decoder_t *p_dec )
  97 {
  98     decoder_sys_t *p_sys = p_dec->p_sys;
  99     subpicture_t *p_spu;
 100     subpicture_data_t spu_data;
 101     spu_properties_t spu_properties;
 102
 103     /* Allocate the subpicture internal data. */
 104     p_spu = decoder_NewSubpicture( p_dec, NULL );
 105     if( !p_spu ) return NULL;
 106
 107     p_spu->i_original_picture_width =
 108         p_dec->fmt_in.subs.spu.i_original_frame_width;
 109     p_spu->i_original_picture_height =
 110         p_dec->fmt_in.subs.spu.i_original_frame_height;
 111
 112     /* Getting the control part */
 113     if( ParseControlSeq( p_dec, p_spu, &spu_data, &spu_properties, p_sys->i_pts ) )
 114     {
 115         /* There was a parse error, delete the subpicture */
 116         decoder_DeleteSubpicture( p_dec, p_spu );
 117         return NULL;
 118     }
 119
 120     /* we are going to expand the RLE stuff so that we won't need to read
 121      * nibbles later on. This will speed things up a lot. Plus, we'll only
 122      * need to do this stupid interlacing stuff once.
 123      *
 124      * Rationale for the "p_spudec->i_rle_size * 4*sizeof(*spu_data.p_data)":
 125      *  one byte gaves two nibbles and may be used twice (once per field)
 126      * generating 4 codes.
 127      */
 128     spu_data.p_data = malloc( sizeof(*spu_data.p_data) * 2 * 2 * p_sys->i_rle_size );
 129
 130     /* We try to display it */
 131     if( ParseRLE( p_dec, &spu_data, &spu_properties ) )
 132     {
 133         /* There was a parse error, delete the subpicture */
 134         decoder_DeleteSubpicture( p_dec, p_spu );
 135         free( spu_data.p_data );
 136         return NULL;
 137     }
 138
 139 #ifdef DEBUG_SPUDEC
 140     msg_Dbg( p_dec, "total size: 0x%x, RLE offsets: 0x%x 0x%x",
 141              p_sys->i_spu_size,
 142              spu_data.pi_offset[0], spu_data.pi_offset[1] );
 143 #endif
 144
 145     Render( p_dec, p_spu, &spu_data, &spu_properties );
 146     free( spu_data.p_data );
 147
 148     return p_spu;
 149 }
 150
 151 /*****************************************************************************
 152  * ParseControlSeq: parse all SPU control sequences
 153  *****************************************************************************
 154  * This is the most important part in SPU decoding. We get dates, palette
 155  * information, coordinates, and so on. For more information on the
 156  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 157  *****************************************************************************/
 158 static int ParseControlSeq( decoder_t *p_dec, subpicture_t *p_spu,
 159                             subpicture_data_t *p_spu_data, spu_properties_t *p_spu_properties, mtime_t i_pts )
 160 {
 161     decoder_sys_t *p_sys = p_dec->p_sys;
 162
 163     /* Our current index in the SPU packet */
 164     unsigned int i_index;
 165
 166     /* The next start-of-control-sequence index and the previous one */
 167     unsigned int i_next_seq = 0, i_cur_seq = 0;
 168
 169     /* Command and date */
 170     uint8_t i_command = SPU_CMD_END;
 171     mtime_t date = 0;
 172     bool b_cmd_offset = false;
 173     bool b_cmd_alpha = false;
 174     subpicture_data_t spu_data_cmd;
 175
 176     if( !p_spu || !p_spu_data )
 177         return VLC_EGENERIC;
 178
 179     /* Create working space for spu data */
 180     memset( &spu_data_cmd, 0, sizeof(spu_data_cmd) );
 181     spu_data_cmd.pi_offset[0] = -1;
 182     spu_data_cmd.pi_offset[1] = -1;
 183     spu_data_cmd.p_data = NULL;
 184     spu_data_cmd.b_palette = false;
 185     spu_data_cmd.b_auto_crop = false;
 186     spu_data_cmd.i_y_top_offset = 0;
 187     spu_data_cmd.i_y_bottom_offset = 0;
 188     spu_data_cmd.pi_alpha[0] = 0x00;
 189     spu_data_cmd.pi_alpha[1] = 0x0f;
 190     spu_data_cmd.pi_alpha[2] = 0x0f;
 191     spu_data_cmd.pi_alpha[3] = 0x0f;
 192
 193     /* Initialize the structure */
 194     p_spu->i_start = p_spu->i_stop = 0;
 195     p_spu->b_ephemer = false;
 196
 197     memset( p_spu_properties, 0, sizeof(*p_spu_properties) );
 198
 199     /* */
 200     *p_spu_data = spu_data_cmd;
 201
 202     for( i_index = 4 + p_sys->i_rle_size; i_index < p_sys->i_spu_size ; )
 203     {
 204         /* If we just read a command sequence, read the next one;
 205          * otherwise, go on with the commands of the current sequence. */
 206         if( i_command == SPU_CMD_END )
 207         {
 208             if( i_index + 4 > p_sys->i_spu_size )
 209             {
 210                 msg_Err( p_dec, "overflow in SPU command sequence" );
 211                 return VLC_EGENERIC;
 212             }
 213
 214             /* */
 215             b_cmd_offset = false;
 216             b_cmd_alpha = false;
 217             /* Get the control sequence date */
 218             date = (mtime_t)GetWBE( &p_sys->buffer[i_index] ) * 11000;
 219
 220             /* Next offset */
 221             i_cur_seq = i_index;
 222             i_next_seq = GetWBE( &p_sys->buffer[i_index+2] );
 223
 224             if( i_next_seq > p_sys->i_spu_size )
 225             {
 226                 msg_Err( p_dec, "overflow in SPU next command sequence" );
 227                 return VLC_EGENERIC;
 228             }
 229
 230             /* Skip what we just read */
 231             i_index += 4;
 232         }
 233
 234         i_command = p_sys->buffer[i_index];
 235
 236         switch( i_command )
 237         {
 238         case SPU_CMD_FORCE_DISPLAY: /* 00 (force displaying) */
 239             p_spu->i_start = i_pts + date;
 240             p_spu->b_ephemer = true;
 241             i_index += 1;
 242             break;
 243
 244         /* Convert the dates in seconds to PTS values */
 245         case SPU_CMD_START_DISPLAY: /* 01 (start displaying) */
 246             p_spu->i_start = i_pts + date;
 247             i_index += 1;
 248             break;
 249
 250         case SPU_CMD_STOP_DISPLAY: /* 02 (stop displaying) */
 251             p_spu->i_stop = i_pts + date;
 252             i_index += 1;
 253             break;
 254
 255         case SPU_CMD_SET_PALETTE:
 256             /* 03xxxx (palette) */
 257             if( i_index + 3 > p_sys->i_spu_size )
 258             {
 259                 msg_Err( p_dec, "overflow in SPU command" );
 260                 return VLC_EGENERIC;
 261             }
 262
 263             if( p_dec->fmt_in.subs.spu.palette[0] == 0xBeeF )
 264             {
 265                 unsigned int idx[4];
 266                 int i;
 267
 268                 spu_data_cmd.b_palette = true;
 269
 270                 idx[0] = (p_sys->buffer[i_index+1]>>4)&0x0f;
 271                 idx[1] = (p_sys->buffer[i_index+1])&0x0f;
 272                 idx[2] = (p_sys->buffer[i_index+2]>>4)&0x0f;
 273                 idx[3] = (p_sys->buffer[i_index+2])&0x0f;
 274
 275                 for( i = 0; i < 4 ; i++ )
 276                 {
 277                     uint32_t i_color = p_dec->fmt_in.subs.spu.palette[1+idx[i]];
 278
 279                     /* FIXME: this job should be done sooner */
 280                     spu_data_cmd.pi_yuv[3-i][0] = (i_color>>16) & 0xff;
 281                     spu_data_cmd.pi_yuv[3-i][1] = (i_color>>0) & 0xff;
 282                     spu_data_cmd.pi_yuv[3-i][2] = (i_color>>8) & 0xff;
 283                 }
 284             }
 285
 286             i_index += 3;
 287             break;
 288
 289         case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
 290             if( i_index + 3 > p_sys->i_spu_size )
 291             {
 292                 msg_Err( p_dec, "overflow in SPU command" );
 293                 return VLC_EGENERIC;
 294             }
 295
 296             if(!p_sys->b_disabletrans)
 297             { /* If we want to use original transparency values */
 298                 b_cmd_alpha = true;
 299                 spu_data_cmd.pi_alpha[3] = (p_sys->buffer[i_index+1]>>4)&0x0f;
 300                 spu_data_cmd.pi_alpha[2] = (p_sys->buffer[i_index+1])&0x0f;
 301                 spu_data_cmd.pi_alpha[1] = (p_sys->buffer[i_index+2]>>4)&0x0f;
 302                 spu_data_cmd.pi_alpha[0] = (p_sys->buffer[i_index+2])&0x0f;
 303             }
 304
 305             i_index += 3;
 306             break;
 307
 308         case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
 309             if( i_index + 7 > p_sys->i_spu_size )
 310             {
 311                 msg_Err( p_dec, "overflow in SPU command" );
 312                 return VLC_EGENERIC;
 313             }
 314
 315             p_spu_properties->i_x = (p_sys->buffer[i_index+1]<<4)|
 316                          ((p_sys->buffer[i_index+2]>>4)&0x0f);
 317             p_spu_properties->i_width = (((p_sys->buffer[i_index+2]&0x0f)<<8)|
 318                               p_sys->buffer[i_index+3]) - p_spu_properties->i_x + 1;
 319
 320             p_spu_properties->i_y = (p_sys->buffer[i_index+4]<<4)|
 321                          ((p_sys->buffer[i_index+5]>>4)&0x0f);
 322             p_spu_properties->i_height = (((p_sys->buffer[i_index+5]&0x0f)<<8)|
 323                               p_sys->buffer[i_index+6]) - p_spu_properties->i_y + 1;
 324
 325             /* Auto crop fullscreen subtitles */
 326             if( p_spu_properties->i_height > 250 )
 327                 p_spu_data->b_auto_crop = true;
 328
 329             i_index += 7;
 330             break;
 331
 332         case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
 333             if( i_index + 5 > p_sys->i_spu_size )
 334             {
 335                 msg_Err( p_dec, "overflow in SPU command" );
 336                 return VLC_EGENERIC;
 337             }
 338
 339             b_cmd_offset = true;
 340             p_spu_data->pi_offset[0] = GetWBE(&p_sys->buffer[i_index+1]) - 4;
 341             p_spu_data->pi_offset[1] = GetWBE(&p_sys->buffer[i_index+3]) - 4;
 342             i_index += 5;
 343             break;
 344
 345         case SPU_CMD_END: /* ff (end) */
 346             if( b_cmd_offset )
 347             {
 348                 /* It seems that palette and alpha from the block having
 349                  * the cmd offset have to be used
 350                  * XXX is it all ? */
 351                 p_spu_data->b_palette = spu_data_cmd.b_palette;
 352                 if( spu_data_cmd.b_palette )
 353                     memcpy( p_spu_data->pi_yuv, spu_data_cmd.pi_yuv, sizeof(spu_data_cmd.pi_yuv) );
 354                 if( b_cmd_alpha )
 355                     memcpy( p_spu_data->pi_alpha, spu_data_cmd.pi_alpha, sizeof(spu_data_cmd.pi_alpha) );
 356             }
 357
 358             i_index += 1;
 359             break;
 360
 361         default: /* xx (unknown command) */
 362             msg_Warn( p_dec, "unknown SPU command 0x%.2x", i_command );
 363             if( i_index + 1 < i_next_seq )
 364             {
 365                  /* There is at least one other command sequence */
 366                  if( p_sys->buffer[i_next_seq - 1] == SPU_CMD_END )
 367                  {
 368                      /* This is consistent. Skip to that command sequence. */
 369                      i_index = i_next_seq;
 370                  }
 371                  else
 372                  {
 373                      /* There were other commands. */
 374                      msg_Warn( p_dec, "cannot recover, dropping subtitle" );
 375                      return VLC_EGENERIC;
 376                  }
 377             }
 378             else
 379             {
 380                 /* We were in the last command sequence. Stop parsing by
 381                  * pretending we met an SPU_CMD_END command. */
 382                 i_command = SPU_CMD_END;
 383                 i_index++;
 384             }
 385         }
 386
 387         /* */
 388         if( i_command == SPU_CMD_END && i_index != i_next_seq )
 389             break;
 390     }
 391
 392     /* Check that the next sequence index matches the current one */
 393     if( i_next_seq != i_cur_seq )
 394     {
 395         msg_Err( p_dec, "index mismatch (0x%.4x != 0x%.4x)",
 396                  i_next_seq, i_cur_seq );
 397         return VLC_EGENERIC;
 398     }
 399
 400     if( i_index > p_sys->i_spu_size )
 401     {
 402         msg_Err( p_dec, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
 403                  i_index, p_sys->i_spu_size );
 404         return VLC_EGENERIC;
 405     }
 406
 407     const int i_spu_size = p_sys->i_spu - 4;
 408     if( p_spu_data->pi_offset[0] < 0 || p_spu_data->pi_offset[0] >= i_spu_size ||
 409         p_spu_data->pi_offset[1] < 0 || p_spu_data->pi_offset[1] >= i_spu_size )
 410     {
 411         msg_Err( p_dec, "invalid offset values" );
 412         return VLC_EGENERIC;
 413     }
 414
 415     if( !p_spu->i_start )
 416     {
 417         msg_Err( p_dec, "no `start display' command" );
 418         return VLC_EGENERIC;
 419     }
 420
 421     if( p_spu->i_stop <= p_spu->i_start && !p_spu->b_ephemer )
 422     {
 423         /* This subtitle will live for 5 seconds or until the next subtitle */
 424         p_spu->i_stop = p_spu->i_start + (mtime_t)500 * 11000;
 425         p_spu->b_ephemer = true;
 426     }
 427
 428     /* Get rid of padding bytes */
 429     if( p_sys->i_spu_size > i_index + 1 )
 430     {
 431         /* Zero or one padding byte are quite usual
 432          * More than one padding byte - this is very strange, but
 433          * we can ignore them. */
 434         msg_Warn( p_dec, "%i padding bytes, we usually get 0 or 1 of them",
 435                   p_sys->i_spu_size - i_index );
 436     }
 437
 438     /* Successfully parsed ! */
 439     return VLC_SUCCESS;
 440 }
 441
 442 /*****************************************************************************
 443  * ParseRLE: parse the RLE part of the subtitle
 444  *****************************************************************************
 445  * This part parses the subtitle graphical data and stores it in a more
 446  * convenient structure for later decoding. For more information on the
 447  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 448  *****************************************************************************/
 449 static int ParseRLE( decoder_t *p_dec,
 450                      subpicture_data_t *p_spu_data,
 451                      const spu_properties_t *p_spu_properties )
 452 {
 453     decoder_sys_t *p_sys = p_dec->p_sys;
 454
 455     const unsigned int i_width = p_spu_properties->i_width;
 456     const unsigned int i_height = p_spu_properties->i_height;
 457     unsigned int i_x, i_y;
 458
 459     uint16_t *p_dest = p_spu_data->p_data;
 460
 461     /* The subtitles are interlaced, we need two offsets */
 462     unsigned int  i_id = 0;                   /* Start on the even SPU layer */
 463     unsigned int  pi_table[ 2 ];
 464     unsigned int *pi_offset;
 465
 466     /* Cropping */
 467     bool b_empty_top = true;
 468     unsigned int i_skipped_top = 0, i_skipped_bottom = 0;
 469     unsigned int i_transparent_code = 0;
 470
 471     /* Colormap statistics */
 472     int i_border = -1;
 473     int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
 474
 475     pi_table[ 0 ] = p_spu_data->pi_offset[ 0 ] << 1;
 476     pi_table[ 1 ] = p_spu_data->pi_offset[ 1 ] << 1;
 477
 478     for( i_y = 0 ; i_y < i_height ; i_y++ )
 479     {
 480         unsigned int i_code;
 481         pi_offset = pi_table + i_id;
 482
 483         for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
 484         {
 485             i_code = 0;
 486             for( unsigned int i_min = 1; i_min <= 0x40 && i_code < i_min; i_min <<= 2 )
 487             {
 488                 if( (*pi_offset >> 1) >= p_sys->i_spu_size )
 489                 {
 490                     msg_Err( p_dec, "out of bounds while reading rle" );
 491                     return VLC_EGENERIC;
 492                 }
 493                 i_code = AddNibble( i_code, &p_sys->buffer[4], pi_offset );
 494             }
 495             if( i_code < 0x0004 )
 496             {
 497                 /* If the 14 first bits are set to 0, then it's a
 498                  * new line. We emulate it. */
 499                 i_code |= ( i_width - i_x ) << 2;
 500             }
 501
 502             if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
 503             {
 504                 msg_Err( p_dec, "out of bounds, %i at (%i,%i) is out of %ix%i",
 505                          i_code >> 2, i_x, i_y, i_width, i_height );
 506                 return VLC_EGENERIC;
 507             }
 508
 509             /* Try to find the border color */
 510             if( p_spu_data->pi_alpha[ i_code & 0x3 ] != 0x00 )
 511             {
 512                 i_border = i_code & 0x3;
 513                 stats[i_border] += i_code >> 2;
 514             }
 515
 516             /* Auto crop subtitles (a lot more optimized) */
 517             if( p_spu_data->b_auto_crop )
 518             {
 519                 if( !i_y )
 520                 {
 521                     /* We assume that if the first line is transparent, then
 522                      * it is using the palette index for the
 523                      * (background) transparent color */
 524                     if( (i_code >> 2) == i_width &&
 525                         p_spu_data->pi_alpha[ i_code & 0x3 ] == 0x00 )
 526                     {
 527                         i_transparent_code = i_code;
 528                     }
 529                     else
 530                     {
 531                         p_spu_data->b_auto_crop = false;
 532                     }
 533                 }
 534
 535                 if( i_code == i_transparent_code )
 536                 {
 537                     if( b_empty_top )
 538                     {
 539                         /* This is a blank top line, we skip it */
 540                       i_skipped_top++;
 541                     }
 542                     else
 543                     {
 544                         /* We can't be sure the current lines will be skipped,
 545                          * so we store the code just in case. */
 546                       *p_dest++ = i_code;
 547                       i_skipped_bottom++;
 548                     }
 549                 }
 550                 else
 551                 {
 552                     /* We got a valid code, store it */
 553                     *p_dest++ = i_code;
 554
 555                     /* Valid code means no blank line */
 556                     b_empty_top = false;
 557                     i_skipped_bottom = 0;
 558                 }
 559             }
 560             else
 561             {
 562                 *p_dest++ = i_code;
 563             }
 564         }
 565
 566         /* Check that we didn't go too far */
 567         if( i_x > i_width )
 568         {
 569             msg_Err( p_dec, "i_x overflowed, %i > %i", i_x, i_width );
 570             return VLC_EGENERIC;
 571         }
 572
 573         /* Byte-align the stream */
 574         if( *pi_offset & 0x1 )
 575         {
 576             (*pi_offset)++;
 577         }
 578
 579         /* Swap fields */
 580         i_id = ~i_id & 0x1;
 581     }
 582
 583     /* We shouldn't get any padding bytes */
 584     if( i_y < i_height )
 585     {
 586         msg_Err( p_dec, "padding bytes found in RLE sequence" );
 587         msg_Err( p_dec, "send mail to <sam@zoy.org> if you "
 588                         "want to help debugging this" );
 589
 590         /* Skip them just in case */
 591         while( i_y < i_height )
 592         {
 593             *p_dest++ = i_width << 2;
 594             i_y++;
 595         }
 596
 597         return VLC_EGENERIC;
 598     }
 599
 600 #ifdef DEBUG_SPUDEC
 601     msg_Dbg( p_dec, "valid subtitle, size: %ix%i, position: %i,%i",
 602              p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 603 #endif
 604
 605     /* Crop if necessary */
 606     if( i_skipped_top || i_skipped_bottom )
 607     {
 608 #ifdef DEBUG_SPUDEC
 609         int i_y = p_spu->i_y + i_skipped_top;
 610         int i_height = p_spu->i_height - (i_skipped_top + i_skipped_bottom);
 611 #endif
 612         p_spu_data->i_y_top_offset = i_skipped_top;
 613         p_spu_data->i_y_bottom_offset = i_skipped_bottom;
 614 #ifdef DEBUG_SPUDEC
 615         msg_Dbg( p_dec, "cropped to: %ix%i, position: %i,%i",
 616                  p_spu->i_width, i_height, p_spu->i_x, i_y );
 617 #endif
 618     }
 619
 620     /* Handle color if no palette was found */
 621     if( !p_spu_data->b_palette )
 622     {
 623         int i, i_inner = -1, i_shade = -1;
 624
 625         /* Set the border color */
 626         p_spu_data->pi_yuv[i_border][0] = 0x00;
 627         p_spu_data->pi_yuv[i_border][1] = 0x80;
 628         p_spu_data->pi_yuv[i_border][2] = 0x80;
 629         stats[i_border] = 0;
 630
 631         /* Find the inner colors */
 632         for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
 633         {
 634             if( stats[i] )
 635             {
 636                 i_inner = i;
 637             }
 638         }
 639
 640         for(       ; i < 4 && i_shade == -1 ; i++ )
 641         {
 642             if( stats[i] )
 643             {
 644                 if( stats[i] > stats[i_inner] )
 645                 {
 646                     i_shade = i_inner;
 647                     i_inner = i;
 648                 }
 649                 else
 650                 {
 651                     i_shade = i;
 652                 }
 653             }
 654         }
 655
 656         /* Set the inner color */
 657         if( i_inner != -1 )
 658         {
 659             p_spu_data->pi_yuv[i_inner][0] = 0xff;
 660             p_spu_data->pi_yuv[i_inner][1] = 0x80;
 661             p_spu_data->pi_yuv[i_inner][2] = 0x80;
 662         }
 663
 664         /* Set the anti-aliasing color */
 665         if( i_shade != -1 )
 666         {
 667             p_spu_data->pi_yuv[i_shade][0] = 0x80;
 668             p_spu_data->pi_yuv[i_shade][1] = 0x80;
 669             p_spu_data->pi_yuv[i_shade][2] = 0x80;
 670         }
 671
 672 #ifdef DEBUG_SPUDEC
 673         msg_Dbg( p_dec, "using custom palette (border %i, inner %i, shade %i)",
 674                  i_border, i_inner, i_shade );
 675 #endif
 676     }
 677
 678     return VLC_SUCCESS;
 679 }
 680
 681 static void Render( decoder_t *p_dec, subpicture_t *p_spu,
 682                     subpicture_data_t *p_spu_data,
 683                     const spu_properties_t *p_spu_properties )
 684 {
 685     uint8_t *p_p;
 686     int i_x, i_y, i_len, i_color, i_pitch;
 687     const uint16_t *p_source = p_spu_data->p_data;
 688     video_format_t fmt;
 689     video_palette_t palette;
 690
 691     /* Create a new subpicture region */
 692     memset( &fmt, 0, sizeof(video_format_t) );
 693     fmt.i_chroma = VLC_CODEC_YUVP;
 694     fmt.i_sar_num = 0; /* 0 means use aspect ratio of background video */
 695     fmt.i_sar_den = 1;
 696     fmt.i_width = fmt.i_visible_width = p_spu_properties->i_width;
 697     fmt.i_height = fmt.i_visible_height = p_spu_properties->i_height -
 698         p_spu_data->i_y_top_offset - p_spu_data->i_y_bottom_offset;
 699     fmt.i_x_offset = fmt.i_y_offset = 0;
 700     fmt.p_palette = &palette;
 701     fmt.p_palette->i_entries = 4;
 702     for( i_x = 0; i_x < fmt.p_palette->i_entries; i_x++ )
 703     {
 704         fmt.p_palette->palette[i_x][0] = p_spu_data->pi_yuv[i_x][0];
 705         fmt.p_palette->palette[i_x][1] = p_spu_data->pi_yuv[i_x][1];
 706         fmt.p_palette->palette[i_x][2] = p_spu_data->pi_yuv[i_x][2];
 707         fmt.p_palette->palette[i_x][3] = p_spu_data->pi_alpha[i_x] * 0x11;
 708     }
 709
 710     p_spu->p_region = subpicture_region_New( &fmt );
 711     if( !p_spu->p_region )
 712     {
 713         msg_Err( p_dec, "cannot allocate SPU region" );
 714         return;
 715     }
 716
 717     p_spu->p_region->i_x = p_spu_properties->i_x;
 718     p_spu->p_region->i_y = p_spu_properties->i_y + p_spu_data->i_y_top_offset;
 719     p_p = p_spu->p_region->p_picture->p->p_pixels;
 720     i_pitch = p_spu->p_region->p_picture->p->i_pitch;
 721
 722     /* Draw until we reach the bottom of the subtitle */
 723     for( i_y = 0; i_y < (int)fmt.i_height * i_pitch; i_y += i_pitch )
 724     {
 725         /* Draw until we reach the end of the line */
 726         for( i_x = 0 ; i_x < (int)fmt.i_width; i_x += i_len )
 727         {
 728             /* Get the RLE part, then draw the line */
 729             i_color = *p_source & 0x3;
 730             i_len = *p_source++ >> 2;
 731             memset( p_p + i_x + i_y, i_color, i_len );
 732         }
 733     }
 734 }