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

   1 /*****************************************************************************
   2  * parse.c: SPU parser
   3  *****************************************************************************
   4  * Copyright (C) 2000-2001 VideoLAN
   5  * $Id: parse.c,v 1.7 2002/12/16 23:25:23 massiot Exp $
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>                                    /* memcpy(), memset() */
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc/vout.h>
  32 #include <vlc/decoder.h>
  33
  34 #include "spudec.h"
  35
  36 /*****************************************************************************
  37  * Local prototypes.
  38  *****************************************************************************/
  39 static int  ParseControlSeq  ( spudec_thread_t *, subpicture_t * );
  40 static int  ParseRLE         ( spudec_thread_t *, subpicture_t *, uint8_t * );
  41
  42 static void DestroySPU       ( subpicture_t * );
  43
  44 static void UpdateSPU        ( subpicture_t *, vlc_object_t * );
  45 static int  CropCallback     ( vlc_object_t *, char const *,
  46                                vlc_value_t, vlc_value_t, void * );
  47
  48 /*****************************************************************************
  49  * AddNibble: read a nibble from a source packet and add it to our integer.
  50  *****************************************************************************/
  51 static inline unsigned int AddNibble( unsigned int i_code,
  52                                       uint8_t *p_src, int *pi_index )
  53 {
  54     if( *pi_index & 0x1 )
  55     {
  56         return( i_code << 4 | ( p_src[(*pi_index)++ >> 1] & 0xf ) );
  57     }
  58     else
  59     {
  60         return( i_code << 4 | p_src[(*pi_index)++ >> 1] >> 4 );
  61     }
  62 }
  63
  64 /*****************************************************************************
  65  * SyncPacket: get in sync with the stream
  66  *****************************************************************************
  67  * This function makes a few sanity checks and returns 0 if it looks like we
  68  * are at the beginning of a subpicture packet.
  69  *****************************************************************************/
  70 int E_(SyncPacket)( spudec_thread_t *p_spudec )
  71 {
  72     /* Re-align the buffer on an 8-bit boundary */
  73     RealignBits( &p_spudec->bit_stream );
  74
  75     /* The total SPU packet size, often bigger than a PS packet */
  76     p_spudec->i_spu_size = GetBits( &p_spudec->bit_stream, 16 );
  77
  78     /* The RLE stuff size (remove 4 because we just read 32 bits) */
  79     p_spudec->i_rle_size = ShowBits( &p_spudec->bit_stream, 16 ) - 4;
  80
  81     /* If the values we got are a bit strange, skip packet */
  82     if( !p_spudec->i_spu_size
  83          || ( p_spudec->i_rle_size >= p_spudec->i_spu_size ) )
  84     {
  85         return VLC_EGENERIC;
  86     }
  87
  88     RemoveBits( &p_spudec->bit_stream, 16 );
  89
  90     return VLC_SUCCESS;
  91 }
  92
  93 /*****************************************************************************
  94  * ParsePacket: parse an SPU packet and send it to the video output
  95  *****************************************************************************
  96  * This function parses the SPU packet and, if valid, sends it to the
  97  * video output.
  98  *****************************************************************************/
  99 void E_(ParsePacket)( spudec_thread_t *p_spudec )
 100 {
 101     subpicture_t * p_spu;
 102     uint8_t      * p_src;
 103     unsigned int   i_offset;
 104     mtime_t        i_pts;
 105
 106     msg_Dbg( p_spudec->p_fifo, "trying to gather a 0x%.2x long subtitle",
 107                                p_spudec->i_spu_size );
 108
 109     /* We cannot display a subpicture with no date */
 110     NextPTS( &p_spudec->bit_stream, &i_pts, NULL );
 111     if( i_pts == 0 )
 112     {
 113         msg_Warn( p_spudec->p_fifo, "subtitle without a date" );
 114         return;
 115     }
 116
 117     /* Allocate the subpicture internal data. */
 118     p_spu = vout_CreateSubPicture( p_spudec->p_vout, MEMORY_SUBPICTURE );
 119
 120     if( p_spu == NULL )
 121     {
 122         return;
 123     }
 124
 125     /* Rationale for the "p_spudec->i_rle_size * 4": we are going to
 126      * expand the RLE stuff so that we won't need to read nibbles later
 127      * on. This will speed things up a lot. Plus, we'll only need to do
 128      * this stupid interlacing stuff once. */
 129     p_spu->p_sys = malloc( sizeof( subpicture_sys_t )
 130                             + p_spudec->i_rle_size * 4 );
 131
 132     if( p_spu->p_sys == NULL )
 133     {
 134         vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 135         return;
 136     }
 137
 138     /* Fill the p_spu structure */
 139     vlc_mutex_init( p_spudec->p_fifo, &p_spu->p_sys->lock );
 140
 141     p_spu->pf_render = E_(RenderSPU);
 142     p_spu->pf_destroy = DestroySPU;
 143     p_spu->p_sys->p_data = (uint8_t*)p_spu->p_sys + sizeof( subpicture_sys_t );
 144     p_spu->p_sys->b_palette = VLC_FALSE;
 145
 146     p_spu->p_sys->pi_alpha[0] = 0x00;
 147     p_spu->p_sys->pi_alpha[1] = 0x0f;
 148     p_spu->p_sys->pi_alpha[2] = 0x0f;
 149     p_spu->p_sys->pi_alpha[3] = 0x0f;
 150
 151     p_spu->p_sys->b_crop = VLC_FALSE;
 152
 153     /* Get display time now. If we do it later, we may miss the PTS. */
 154     p_spu->p_sys->i_pts = i_pts;
 155
 156     /* Attach to our input thread */
 157     p_spu->p_sys->p_input = vlc_object_find( p_spudec->p_fifo,
 158                                              VLC_OBJECT_INPUT, FIND_PARENT );
 159     if( p_spu->p_sys->p_input )
 160     {
 161         vlc_value_t val;
 162
 163         if( !var_Get( p_spu->p_sys->p_input, "highlight-mutex", &val ) )
 164         {
 165             vlc_mutex_t *p_mutex = val.p_address;
 166
 167             vlc_mutex_lock( p_mutex );
 168             UpdateSPU( p_spu, VLC_OBJECT(p_spu->p_sys->p_input) );
 169             var_AddCallback( p_spu->p_sys->p_input,
 170                              "highlight", CropCallback, p_spu );
 171             vlc_mutex_unlock( p_mutex );
 172         }
 173     }
 174
 175     /* Allocate the temporary buffer we will parse */
 176     p_src = malloc( p_spudec->i_rle_size );
 177
 178     if( p_src == NULL )
 179     {
 180         msg_Err( p_spudec->p_fifo, "out of memory" );
 181         vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 182         return;
 183     }
 184
 185     /* Get RLE data */
 186     for( i_offset = 0; i_offset < p_spudec->i_rle_size;
 187          i_offset += SPU_CHUNK_SIZE )
 188     {
 189         GetChunk( &p_spudec->bit_stream, p_src + i_offset,
 190                   ( i_offset + SPU_CHUNK_SIZE < p_spudec->i_rle_size ) ?
 191                   SPU_CHUNK_SIZE : p_spudec->i_rle_size - i_offset );
 192
 193         /* Abort subtitle parsing if we were requested to stop */
 194         if( p_spudec->p_fifo->b_die )
 195         {
 196             free( p_src );
 197             vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 198             return;
 199         }
 200     }
 201
 202 #if 0
 203     /* Dump the subtitle info */
 204     intf_WarnHexDump( 5, p_spu->p_sys->p_data, p_spudec->i_rle_size );
 205 #endif
 206
 207     /* Getting the control part */
 208     if( ParseControlSeq( p_spudec, p_spu ) )
 209     {
 210         /* There was a parse error, delete the subpicture */
 211         free( p_src );
 212         vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 213         return;
 214     }
 215
 216     /* At this point, no more GetBit() command is needed, so we have all
 217      * the data we need to tell whether the subtitle is valid. Thus we
 218      * try to display it and we ignore b_die. */
 219
 220     if( ParseRLE( p_spudec, p_spu, p_src ) )
 221     {
 222         /* There was a parse error, delete the subpicture */
 223         free( p_src );
 224         vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 225         return;
 226     }
 227
 228     msg_Dbg( p_spudec->p_fifo, "total size: 0x%x, RLE offsets: 0x%x 0x%x",
 229              p_spudec->i_spu_size,
 230              p_spu->p_sys->pi_offset[0], p_spu->p_sys->pi_offset[1] );
 231
 232     /* SPU is finished - we can ask the video output to display it */
 233     vout_DisplaySubPicture( p_spudec->p_vout, p_spu );
 234
 235     /* TODO: do stuff! */
 236
 237     /* Clean up */
 238     free( p_src );
 239 }
 240
 241 /*****************************************************************************
 242  * ParseControlSeq: parse all SPU control sequences
 243  *****************************************************************************
 244  * This is the most important part in SPU decoding. We get dates, palette
 245  * information, coordinates, and so on. For more information on the
 246  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 247  *****************************************************************************/
 248 static int ParseControlSeq( spudec_thread_t *p_spudec,
 249                                   subpicture_t * p_spu )
 250 {
 251     /* Our current index in the SPU packet */
 252     unsigned int i_index = p_spudec->i_rle_size + 4;
 253
 254     /* The next start-of-control-sequence index and the previous one */
 255     unsigned int i_next_seq = 0, i_cur_seq = 0;
 256
 257     /* Command and date */
 258     uint8_t i_command = SPU_CMD_END;
 259     mtime_t date = 0;
 260
 261     unsigned int i, pi_alpha[4];
 262
 263     /* Initialize the structure */
 264     p_spu->i_start = p_spu->i_stop = 0;
 265     p_spu->b_ephemer = VLC_FALSE;
 266
 267     do
 268     {
 269         /* If we just read a command sequence, read the next one;
 270          * otherwise, go on with the commands of the current sequence. */
 271         if( i_command == SPU_CMD_END )
 272         {
 273             /* Get the control sequence date */
 274             date = GetBits( &p_spudec->bit_stream, 16 );
 275
 276             /* Next offset */
 277             i_cur_seq = i_index;
 278             i_next_seq = GetBits( &p_spudec->bit_stream, 16 );
 279
 280             /* Skip what we just read */
 281             i_index += 4;
 282         }
 283
 284         i_command = GetBits( &p_spudec->bit_stream, 8 );
 285         i_index++;
 286
 287         switch( i_command )
 288         {
 289         case SPU_CMD_FORCE_DISPLAY: /* 00 (force displaying) */
 290             p_spu->i_start = p_spu->p_sys->i_pts + ( date * 11000 );
 291             p_spu->b_ephemer = VLC_TRUE;
 292             break;
 293
 294         /* Convert the dates in seconds to PTS values */
 295         case SPU_CMD_START_DISPLAY: /* 01 (start displaying) */
 296             p_spu->i_start = p_spu->p_sys->i_pts + ( date * 11000 );
 297             break;
 298
 299         case SPU_CMD_STOP_DISPLAY: /* 02 (stop displaying) */
 300             p_spu->i_stop = p_spu->p_sys->i_pts + ( date * 11000 );
 301             break;
 302
 303         case SPU_CMD_SET_PALETTE:
 304
 305             /* 03xxxx (palette) */
 306             if( p_spudec->p_fifo->p_demux_data
 307                  && *(int*)p_spudec->p_fifo->p_demux_data == 0xBeeF )
 308             {
 309                 uint32_t i_color;
 310
 311                 p_spu->p_sys->b_palette = VLC_TRUE;
 312                 for( i = 0; i < 4 ; i++ )
 313                 {
 314                     i_color = ((uint32_t*)((char*)p_spudec->p_fifo->
 315                                 p_demux_data + sizeof(int)))[
 316                                   GetBits(&p_spudec->bit_stream, 4) ];
 317
 318                     /* FIXME: this job should be done sooner */
 319                     p_spu->p_sys->pi_yuv[3-i][0] = (i_color>>16) & 0xff;
 320                     p_spu->p_sys->pi_yuv[3-i][1] = (i_color>>0) & 0xff;
 321                     p_spu->p_sys->pi_yuv[3-i][2] = (i_color>>8) & 0xff;
 322                 }
 323             }
 324             else
 325             {
 326                 RemoveBits( &p_spudec->bit_stream, 16 );
 327             }
 328             i_index += 2;
 329
 330             break;
 331
 332         case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
 333             pi_alpha[3] = GetBits( &p_spudec->bit_stream, 4 );
 334             pi_alpha[2] = GetBits( &p_spudec->bit_stream, 4 );
 335             pi_alpha[1] = GetBits( &p_spudec->bit_stream, 4 );
 336             pi_alpha[0] = GetBits( &p_spudec->bit_stream, 4 );
 337
 338             /* Ignore blank alpha palette. Sometimes spurious blank
 339              * alpha palettes are present - dunno why. */
 340             if( pi_alpha[0] | pi_alpha[1] | pi_alpha[2] | pi_alpha[3] )
 341             {
 342                 p_spu->p_sys->pi_alpha[0] = pi_alpha[0];
 343                 p_spu->p_sys->pi_alpha[1] = pi_alpha[1];
 344                 p_spu->p_sys->pi_alpha[2] = pi_alpha[2];
 345                 p_spu->p_sys->pi_alpha[3] = pi_alpha[3];
 346             }
 347             else
 348             {
 349                 msg_Warn( p_spudec->p_fifo, "ignoring blank alpha palette" );
 350             }
 351
 352             i_index += 2;
 353             break;
 354
 355         case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
 356             p_spu->i_x = GetBits( &p_spudec->bit_stream, 12 );
 357             p_spu->i_width = GetBits( &p_spudec->bit_stream, 12 )
 358                               - p_spu->i_x + 1;
 359
 360             p_spu->i_y = GetBits( &p_spudec->bit_stream, 12 );
 361             p_spu->i_height = GetBits( &p_spudec->bit_stream, 12 )
 362                                - p_spu->i_y + 1;
 363
 364             i_index += 6;
 365             break;
 366
 367         case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
 368             p_spu->p_sys->pi_offset[0] =
 369                 GetBits( &p_spudec->bit_stream, 16 ) - 4;
 370
 371             p_spu->p_sys->pi_offset[1] =
 372                 GetBits( &p_spudec->bit_stream, 16 ) - 4;
 373
 374             i_index += 4;
 375             break;
 376
 377         case SPU_CMD_END: /* ff (end) */
 378             break;
 379
 380         default: /* xx (unknown command) */
 381             msg_Err( p_spudec->p_fifo, "unknown command 0x%.2x",
 382                                        i_command );
 383             return VLC_EGENERIC;
 384         }
 385
 386         /* We need to check for quit commands here */
 387         if( p_spudec->p_fifo->b_die )
 388         {
 389             return VLC_EGENERIC;
 390         }
 391
 392     } while( i_command != SPU_CMD_END || i_index == i_next_seq );
 393
 394     /* Check that the next sequence index matches the current one */
 395     if( i_next_seq != i_cur_seq )
 396     {
 397         msg_Err( p_spudec->p_fifo, "index mismatch (0x%.4x != 0x%.4x)",
 398                                    i_next_seq, i_cur_seq );
 399         return VLC_EGENERIC;
 400     }
 401
 402     if( i_index > p_spudec->i_spu_size )
 403     {
 404         msg_Err( p_spudec->p_fifo, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
 405                                    i_index, p_spudec->i_spu_size );
 406         return VLC_EGENERIC;
 407     }
 408
 409     if( !p_spu->i_start )
 410     {
 411         msg_Err( p_spudec->p_fifo, "no `start display' command" );
 412     }
 413
 414     if( !p_spu->i_stop && !p_spu->b_ephemer )
 415     {
 416         /* This subtitle will live for 5 seconds or until the next subtitle */
 417         p_spu->i_stop = p_spu->i_start + 500 * 11000;
 418         p_spu->b_ephemer = VLC_TRUE;
 419     }
 420
 421     /* Get rid of padding bytes */
 422     switch( p_spudec->i_spu_size - i_index )
 423     {
 424         /* Zero or one padding byte, quite usual */
 425         case 1:
 426             RemoveBits( &p_spudec->bit_stream, 8 );
 427             i_index++;
 428         case 0:
 429             break;
 430
 431         /* More than one padding byte - this is very strange, but
 432          * we can deal with it */
 433         default:
 434             msg_Warn( p_spudec->p_fifo,
 435                       "%i padding bytes, we usually get 0 or 1 of them",
 436                       p_spudec->i_spu_size - i_index );
 437
 438             while( i_index < p_spudec->i_spu_size )
 439             {
 440                 RemoveBits( &p_spudec->bit_stream, 8 );
 441                 i_index++;
 442             }
 443
 444             break;
 445     }
 446
 447     /* Successfully parsed ! */
 448     return VLC_SUCCESS;
 449 }
 450
 451 /*****************************************************************************
 452  * ParseRLE: parse the RLE part of the subtitle
 453  *****************************************************************************
 454  * This part parses the subtitle graphical data and stores it in a more
 455  * convenient structure for later decoding. For more information on the
 456  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 457  *****************************************************************************/
 458 static int ParseRLE( spudec_thread_t *p_spudec,
 459                      subpicture_t * p_spu, uint8_t * p_src )
 460 {
 461     unsigned int i_code;
 462
 463     unsigned int i_width = p_spu->i_width;
 464     unsigned int i_height = p_spu->i_height;
 465     unsigned int i_x, i_y;
 466
 467     uint16_t *p_dest = (uint16_t *)p_spu->p_sys->p_data;
 468
 469     /* The subtitles are interlaced, we need two offsets */
 470     unsigned int  i_id = 0;                   /* Start on the even SPU layer */
 471     unsigned int  pi_table[ 2 ];
 472     unsigned int *pi_offset;
 473
 474 #if 0 /* cropping */
 475     vlc_bool_t b_empty_top = VLC_TRUE,
 476                b_empty_bottom = VLC_FALSE;
 477     unsigned int i_skipped_top = 0,
 478                  i_skipped_bottom = 0;
 479 #endif
 480
 481     /* Colormap statistics */
 482     int i_border = -1;
 483     int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
 484
 485     pi_table[ 0 ] = p_spu->p_sys->pi_offset[ 0 ] << 1;
 486     pi_table[ 1 ] = p_spu->p_sys->pi_offset[ 1 ] << 1;
 487
 488     for( i_y = 0 ; i_y < i_height ; i_y++ )
 489     {
 490         pi_offset = pi_table + i_id;
 491
 492         for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
 493         {
 494             i_code = AddNibble( 0, p_src, pi_offset );
 495
 496             if( i_code < 0x04 )
 497             {
 498                 i_code = AddNibble( i_code, p_src, pi_offset );
 499
 500                 if( i_code < 0x10 )
 501                 {
 502                     i_code = AddNibble( i_code, p_src, pi_offset );
 503
 504                     if( i_code < 0x040 )
 505                     {
 506                         i_code = AddNibble( i_code, p_src, pi_offset );
 507
 508                         if( i_code < 0x0100 )
 509                         {
 510                             /* If the 14 first bits are set to 0, then it's a
 511                              * new line. We emulate it. */
 512                             if( i_code < 0x0004 )
 513                             {
 514                                 i_code |= ( i_width - i_x ) << 2;
 515                             }
 516                             else
 517                             {
 518                                 /* We have a boo boo ! */
 519                                 msg_Err( p_spudec->p_fifo, "unknown RLE code "
 520                                          "0x%.4x", i_code );
 521                                 return VLC_EGENERIC;
 522                             }
 523                         }
 524                     }
 525                 }
 526             }
 527
 528             if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
 529             {
 530                 msg_Err( p_spudec->p_fifo,
 531                          "out of bounds, %i at (%i,%i) is out of %ix%i",
 532                          i_code >> 2, i_x, i_y, i_width, i_height );
 533                 return VLC_EGENERIC;
 534             }
 535
 536             /* Try to find the border color */
 537             if( p_spu->p_sys->pi_alpha[ i_code & 0x3 ] != 0x00 )
 538             {
 539                 i_border = i_code & 0x3;
 540                 stats[i_border] += i_code >> 2;
 541             }
 542
 543 #if 0 /* cropping */
 544             if( (i_code >> 2) == i_width
 545                  && p_spu->p_sys->pi_alpha[ i_code & 0x3 ] == 0x00 )
 546             {
 547                 if( b_empty_top )
 548                 {
 549                     /* This is a blank top line, we skip it */
 550                     i_skipped_top++;
 551                 }
 552                 else
 553                 {
 554                     /* We can't be sure the current lines will be skipped,
 555                      * so we store the code just in case. */
 556                     *p_dest++ = i_code;
 557
 558                     b_empty_bottom = VLC_TRUE;
 559                     i_skipped_bottom++;
 560                 }
 561             }
 562             else
 563             {
 564                 /* We got a valid code, store it */
 565                 *p_dest++ = i_code;
 566
 567                 /* Valid code means no blank line */
 568                 b_empty_top = VLC_FALSE;
 569                 b_empty_bottom = VLC_FALSE;
 570                 i_skipped_bottom = 0;
 571             }
 572 #else
 573             *p_dest++ = i_code;
 574 #endif
 575         }
 576
 577         /* Check that we didn't go too far */
 578         if( i_x > i_width )
 579         {
 580             msg_Err( p_spudec->p_fifo, "i_x overflowed, %i > %i",
 581                                        i_x, i_width );
 582             return VLC_EGENERIC;
 583         }
 584
 585         /* Byte-align the stream */
 586         if( *pi_offset & 0x1 )
 587         {
 588             (*pi_offset)++;
 589         }
 590
 591         /* Swap fields */
 592         i_id = ~i_id & 0x1;
 593     }
 594
 595     /* We shouldn't get any padding bytes */
 596     if( i_y < i_height )
 597     {
 598         msg_Err( p_spudec->p_fifo, "padding bytes found in RLE sequence" );
 599         msg_Err( p_spudec->p_fifo, "send mail to <sam@zoy.org> if you "
 600                                    "want to help debugging this" );
 601
 602         /* Skip them just in case */
 603         while( i_y < i_height )
 604         {
 605             *p_dest++ = i_width << 2;
 606             i_y++;
 607         }
 608
 609         return VLC_EGENERIC;
 610     }
 611
 612     msg_Dbg( p_spudec->p_fifo, "valid subtitle, size: %ix%i, position: %i,%i",
 613              p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 614
 615 #if 0 /* cropping */
 616     /* Crop if necessary */
 617     if( i_skipped_top || i_skipped_bottom )
 618     {
 619         p_spu->i_y += i_skipped_top;
 620         p_spu->i_height -= i_skipped_top + i_skipped_bottom;
 621
 622         msg_Dbg( p_spudec->p_fifo, "cropped to: %ix%i, position: %i,%i",
 623                  p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 624     }
 625 #endif
 626
 627     /* Handle color if no palette was found */
 628     if( !p_spu->p_sys->b_palette )
 629     {
 630         int i, i_inner = -1, i_shade = -1;
 631
 632         /* Set the border color */
 633         p_spu->p_sys->pi_yuv[i_border][0] = 0x00;
 634         p_spu->p_sys->pi_yuv[i_border][1] = 0x80;
 635         p_spu->p_sys->pi_yuv[i_border][2] = 0x80;
 636         stats[i_border] = 0;
 637
 638         /* Find the inner colors */
 639         for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
 640         {
 641             if( stats[i] )
 642             {
 643                 i_inner = i;
 644             }
 645         }
 646
 647         for(       ; i < 4 && i_shade == -1 ; i++ )
 648         {
 649             if( stats[i] )
 650             {
 651                 if( stats[i] > stats[i_inner] )
 652                 {
 653                     i_shade = i_inner;
 654                     i_inner = i;
 655                 }
 656                 else
 657                 {
 658                     i_shade = i;
 659                 }
 660             }
 661         }
 662
 663         /* Set the inner color */
 664         if( i_inner != -1 )
 665         {
 666             p_spu->p_sys->pi_yuv[i_inner][0] = 0xff;
 667             p_spu->p_sys->pi_yuv[i_inner][1] = 0x80;
 668             p_spu->p_sys->pi_yuv[i_inner][2] = 0x80;
 669         }
 670
 671         /* Set the anti-aliasing color */
 672         if( i_shade != -1 )
 673         {
 674             p_spu->p_sys->pi_yuv[i_shade][0] = 0x80;
 675             p_spu->p_sys->pi_yuv[i_shade][1] = 0x80;
 676             p_spu->p_sys->pi_yuv[i_shade][2] = 0x80;
 677         }
 678
 679         msg_Dbg( p_spudec->p_fifo,
 680                  "using custom palette (border %i, inner %i, shade %i)",
 681                  i_border, i_inner, i_shade );
 682     }
 683
 684     return VLC_SUCCESS;
 685 }
 686
 687 /*****************************************************************************
 688  * DestroySPU: subpicture destructor
 689  *****************************************************************************/
 690 static void DestroySPU( subpicture_t *p_spu )
 691 {
 692     if( p_spu->p_sys->p_input )
 693     {
 694         /* Detach from our input thread */
 695         var_DelCallback( p_spu->p_sys->p_input, "highlight",
 696                          CropCallback, p_spu );
 697         vlc_object_release( p_spu->p_sys->p_input );
 698     }
 699
 700     vlc_mutex_destroy( &p_spu->p_sys->lock );
 701     free( p_spu->p_sys );
 702 }
 703
 704 /*****************************************************************************
 705  * UpdateSPU: update subpicture settings
 706  *****************************************************************************
 707  * This function is called from CropCallback and at initialization time, to
 708  * retrieve crop information from the input.
 709  *****************************************************************************/
 710 static void UpdateSPU( subpicture_t *p_spu, vlc_object_t *p_object )
 711 {
 712     vlc_value_t val;
 713
 714     if( var_Get( p_object, "highlight", &val ) )
 715     {
 716         return;
 717     }
 718
 719     p_spu->p_sys->b_crop = val.b_bool;
 720     if( !p_spu->p_sys->b_crop )
 721     {
 722         return;
 723     }
 724
 725     var_Get( p_object, "x-start", &val );
 726     p_spu->p_sys->i_x_start = val.i_int;
 727     var_Get( p_object, "y-start", &val );
 728     p_spu->p_sys->i_y_start = val.i_int;
 729     var_Get( p_object, "x-end", &val );
 730     p_spu->p_sys->i_x_end = val.i_int;
 731     var_Get( p_object, "y-end", &val );
 732     p_spu->p_sys->i_y_end = val.i_int;
 733
 734 #if 0
 735     if( var_Get( p_object, "color", &val ) == VLC_SUCCESS )
 736     {
 737         p_spu->p_sys->pi_color[0] = ((uint8_t *)val.p_address)[0];
 738         p_spu->p_sys->pi_color[1] = ((uint8_t *)val.p_address)[1];
 739         p_spu->p_sys->pi_color[2] = ((uint8_t *)val.p_address)[2];
 740         p_spu->p_sys->pi_color[3] = ((uint8_t *)val.p_address)[3];
 741     }
 742 #endif
 743
 744     if( var_Get( p_object, "contrast", &val ) == VLC_SUCCESS )
 745     {
 746         p_spu->p_sys->pi_alpha[0] = ((uint8_t *)val.p_address)[0];
 747         p_spu->p_sys->pi_alpha[1] = ((uint8_t *)val.p_address)[1];
 748         p_spu->p_sys->pi_alpha[2] = ((uint8_t *)val.p_address)[2];
 749         p_spu->p_sys->pi_alpha[3] = ((uint8_t *)val.p_address)[3];
 750     }
 751 }
 752
 753 /*****************************************************************************
 754  * CropCallback: called when the highlight properties are changed
 755  *****************************************************************************
 756  * This callback is called from the input thread when we need cropping
 757  *****************************************************************************/
 758 static int CropCallback( vlc_object_t *p_object, char const *psz_var,
 759                          vlc_value_t oldval, vlc_value_t newval, void *p_data )
 760 {
 761     UpdateSPU( (subpicture_t *)p_data, p_object );
 762
 763     return VLC_SUCCESS;
 764 }
 765