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 1.13 2003/07/29 22:25:40 gbazin 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
 170             var_AddCallback( p_spu->p_sys->p_input,
 171                              "highlight", CropCallback, p_spu );
 172             vlc_mutex_unlock( p_mutex );
 173         }
 174     }
 175
 176     /* Allocate the temporary buffer we will parse */
 177     p_src = malloc( p_spudec->i_rle_size );
 178
 179     if( p_src == NULL )
 180     {
 181         msg_Err( p_spudec->p_fifo, "out of memory" );
 182         vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 183         return;
 184     }
 185
 186     /* Get RLE data */
 187     for( i_offset = 0; i_offset < p_spudec->i_rle_size;
 188          i_offset += SPU_CHUNK_SIZE )
 189     {
 190         GetChunk( &p_spudec->bit_stream, p_src + i_offset,
 191                   ( i_offset + SPU_CHUNK_SIZE < p_spudec->i_rle_size ) ?
 192                   SPU_CHUNK_SIZE : p_spudec->i_rle_size - i_offset );
 193
 194         /* Abort subtitle parsing if we were requested to stop */
 195         if( p_spudec->p_fifo->b_die )
 196         {
 197             free( p_src );
 198             vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 199             return;
 200         }
 201     }
 202
 203 #if 0
 204     /* Dump the subtitle info */
 205     intf_WarnHexDump( 5, p_spu->p_sys->p_data, p_spudec->i_rle_size );
 206 #endif
 207
 208     /* Getting the control part */
 209     if( ParseControlSeq( p_spudec, p_spu ) )
 210     {
 211         /* There was a parse error, delete the subpicture */
 212         free( p_src );
 213         vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 214         return;
 215     }
 216
 217     /* At this point, no more GetBit() command is needed, so we have all
 218      * the data we need to tell whether the subtitle is valid. Thus we
 219      * try to display it and we ignore b_die. */
 220
 221     if( ParseRLE( p_spudec, p_spu, p_src ) )
 222     {
 223         /* There was a parse error, delete the subpicture */
 224         free( p_src );
 225         vout_DestroySubPicture( p_spudec->p_vout, p_spu );
 226         return;
 227     }
 228
 229     msg_Dbg( p_spudec->p_fifo, "total size: 0x%x, RLE offsets: 0x%x 0x%x",
 230              p_spudec->i_spu_size,
 231              p_spu->p_sys->pi_offset[0], p_spu->p_sys->pi_offset[1] );
 232
 233     /* SPU is finished - we can ask the video output to display it */
 234     vout_DisplaySubPicture( p_spudec->p_vout, p_spu );
 235
 236     /* TODO: do stuff! */
 237
 238     /* Clean up */
 239     free( p_src );
 240 }
 241
 242 /*****************************************************************************
 243  * ParseControlSeq: parse all SPU control sequences
 244  *****************************************************************************
 245  * This is the most important part in SPU decoding. We get dates, palette
 246  * information, coordinates, and so on. For more information on the
 247  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 248  *****************************************************************************/
 249 static int ParseControlSeq( spudec_thread_t *p_spudec,
 250                                   subpicture_t * p_spu )
 251 {
 252     /* Our current index in the SPU packet */
 253     unsigned int i_index = p_spudec->i_rle_size + 4;
 254
 255     /* The next start-of-control-sequence index and the previous one */
 256     unsigned int i_next_seq = 0, i_cur_seq = 0;
 257
 258     /* Command and date */
 259     uint8_t i_command = SPU_CMD_END;
 260     mtime_t date = 0;
 261
 262     unsigned int i, pi_alpha[4];
 263
 264     /* Initialize the structure */
 265     p_spu->i_start = p_spu->i_stop = 0;
 266     p_spu->b_ephemer = VLC_FALSE;
 267
 268     do
 269     {
 270         /* If we just read a command sequence, read the next one;
 271          * otherwise, go on with the commands of the current sequence. */
 272         if( i_command == SPU_CMD_END )
 273         {
 274             /* Get the control sequence date */
 275             date = (mtime_t)GetBits( &p_spudec->bit_stream, 16 ) * 11000
 276                     * p_spudec->bit_stream.p_pes->i_rate / DEFAULT_RATE;
 277
 278             /* Next offset */
 279             i_cur_seq = i_index;
 280             i_next_seq = GetBits( &p_spudec->bit_stream, 16 );
 281
 282             /* Skip what we just read */
 283             i_index += 4;
 284         }
 285
 286         i_command = GetBits( &p_spudec->bit_stream, 8 );
 287         i_index++;
 288
 289         switch( i_command )
 290         {
 291         case SPU_CMD_FORCE_DISPLAY: /* 00 (force displaying) */
 292             p_spu->i_start = p_spu->p_sys->i_pts + date;
 293             p_spu->b_ephemer = VLC_TRUE;
 294             break;
 295
 296         /* Convert the dates in seconds to PTS values */
 297         case SPU_CMD_START_DISPLAY: /* 01 (start displaying) */
 298             p_spu->i_start = p_spu->p_sys->i_pts + date;
 299             break;
 300
 301         case SPU_CMD_STOP_DISPLAY: /* 02 (stop displaying) */
 302             p_spu->i_stop = p_spu->p_sys->i_pts + date;
 303             break;
 304
 305         case SPU_CMD_SET_PALETTE:
 306
 307             /* 03xxxx (palette) */
 308             if( p_spudec->p_fifo->p_demux_data
 309                  && *(int*)p_spudec->p_fifo->p_demux_data == 0xBeeF )
 310             {
 311                 uint32_t i_color;
 312
 313                 p_spu->p_sys->b_palette = VLC_TRUE;
 314                 for( i = 0; i < 4 ; i++ )
 315                 {
 316                     i_color = ((uint32_t*)((char*)p_spudec->p_fifo->
 317                                 p_demux_data + sizeof(int)))[
 318                                   GetBits(&p_spudec->bit_stream, 4) ];
 319
 320                     /* FIXME: this job should be done sooner */
 321                     p_spu->p_sys->pi_yuv[3-i][0] = (i_color>>16) & 0xff;
 322                     p_spu->p_sys->pi_yuv[3-i][1] = (i_color>>0) & 0xff;
 323                     p_spu->p_sys->pi_yuv[3-i][2] = (i_color>>8) & 0xff;
 324                 }
 325             }
 326             else
 327             {
 328                 RemoveBits( &p_spudec->bit_stream, 16 );
 329             }
 330             i_index += 2;
 331
 332             break;
 333
 334         case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
 335             pi_alpha[3] = GetBits( &p_spudec->bit_stream, 4 );
 336             pi_alpha[2] = GetBits( &p_spudec->bit_stream, 4 );
 337             pi_alpha[1] = GetBits( &p_spudec->bit_stream, 4 );
 338             pi_alpha[0] = GetBits( &p_spudec->bit_stream, 4 );
 339
 340             /* Ignore blank alpha palette. Sometimes spurious blank
 341              * alpha palettes are present - dunno why. */
 342             if( pi_alpha[0] | pi_alpha[1] | pi_alpha[2] | pi_alpha[3] )
 343             {
 344                 p_spu->p_sys->pi_alpha[0] = pi_alpha[0];
 345                 p_spu->p_sys->pi_alpha[1] = pi_alpha[1];
 346                 p_spu->p_sys->pi_alpha[2] = pi_alpha[2];
 347                 p_spu->p_sys->pi_alpha[3] = pi_alpha[3];
 348             }
 349             else
 350             {
 351                 msg_Warn( p_spudec->p_fifo, "ignoring blank alpha palette" );
 352             }
 353
 354             i_index += 2;
 355             break;
 356
 357         case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
 358             p_spu->i_x = GetBits( &p_spudec->bit_stream, 12 );
 359             p_spu->i_width = GetBits( &p_spudec->bit_stream, 12 )
 360                               - p_spu->i_x + 1;
 361
 362             p_spu->i_y = GetBits( &p_spudec->bit_stream, 12 );
 363             p_spu->i_height = GetBits( &p_spudec->bit_stream, 12 )
 364                                - p_spu->i_y + 1;
 365
 366             i_index += 6;
 367             break;
 368
 369         case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
 370             p_spu->p_sys->pi_offset[0] =
 371                 GetBits( &p_spudec->bit_stream, 16 ) - 4;
 372
 373             p_spu->p_sys->pi_offset[1] =
 374                 GetBits( &p_spudec->bit_stream, 16 ) - 4;
 375
 376             i_index += 4;
 377             break;
 378
 379         case SPU_CMD_END: /* ff (end) */
 380             break;
 381
 382         default: /* xx (unknown command) */
 383             msg_Err( p_spudec->p_fifo, "unknown command 0x%.2x",
 384                                        i_command );
 385             return VLC_EGENERIC;
 386         }
 387
 388         /* We need to check for quit commands here */
 389         if( p_spudec->p_fifo->b_die )
 390         {
 391             return VLC_EGENERIC;
 392         }
 393
 394     } while( i_command != SPU_CMD_END || i_index == i_next_seq );
 395
 396     /* Check that the next sequence index matches the current one */
 397     if( i_next_seq != i_cur_seq )
 398     {
 399         msg_Err( p_spudec->p_fifo, "index mismatch (0x%.4x != 0x%.4x)",
 400                                    i_next_seq, i_cur_seq );
 401         return VLC_EGENERIC;
 402     }
 403
 404     if( i_index > p_spudec->i_spu_size )
 405     {
 406         msg_Err( p_spudec->p_fifo, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
 407                                    i_index, p_spudec->i_spu_size );
 408         return VLC_EGENERIC;
 409     }
 410
 411     if( !p_spu->i_start )
 412     {
 413         msg_Err( p_spudec->p_fifo, "no `start display' command" );
 414     }
 415
 416     if( p_spu->i_stop <= p_spu->i_start && !p_spu->b_ephemer )
 417     {
 418         /* This subtitle will live for 5 seconds or until the next subtitle */
 419         p_spu->i_stop = p_spu->i_start + (mtime_t)500 * 11000
 420                         * p_spudec->bit_stream.p_pes->i_rate / DEFAULT_RATE;
 421         p_spu->b_ephemer = VLC_TRUE;
 422     }
 423
 424     /* Get rid of padding bytes */
 425     switch( p_spudec->i_spu_size - i_index )
 426     {
 427         /* Zero or one padding byte, quite usual */
 428         case 1:
 429             RemoveBits( &p_spudec->bit_stream, 8 );
 430             i_index++;
 431         case 0:
 432             break;
 433
 434         /* More than one padding byte - this is very strange, but
 435          * we can deal with it */
 436         default:
 437             msg_Warn( p_spudec->p_fifo,
 438                       "%i padding bytes, we usually get 0 or 1 of them",
 439                       p_spudec->i_spu_size - i_index );
 440
 441             while( i_index < p_spudec->i_spu_size )
 442             {
 443                 RemoveBits( &p_spudec->bit_stream, 8 );
 444                 i_index++;
 445             }
 446
 447             break;
 448     }
 449
 450     /* Successfully parsed ! */
 451     return VLC_SUCCESS;
 452 }
 453
 454 /*****************************************************************************
 455  * ParseRLE: parse the RLE part of the subtitle
 456  *****************************************************************************
 457  * This part parses the subtitle graphical data and stores it in a more
 458  * convenient structure for later decoding. For more information on the
 459  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 460  *****************************************************************************/
 461 static int ParseRLE( spudec_thread_t *p_spudec,
 462                      subpicture_t * p_spu, uint8_t * p_src )
 463 {
 464     unsigned int i_code;
 465
 466     unsigned int i_width = p_spu->i_width;
 467     unsigned int i_height = p_spu->i_height;
 468     unsigned int i_x, i_y;
 469
 470     uint16_t *p_dest = (uint16_t *)p_spu->p_sys->p_data;
 471
 472     /* The subtitles are interlaced, we need two offsets */
 473     unsigned int  i_id = 0;                   /* Start on the even SPU layer */
 474     unsigned int  pi_table[ 2 ];
 475     unsigned int *pi_offset;
 476
 477 #if 0 /* cropping */
 478     vlc_bool_t b_empty_top = VLC_TRUE,
 479                b_empty_bottom = VLC_FALSE;
 480     unsigned int i_skipped_top = 0,
 481                  i_skipped_bottom = 0;
 482 #endif
 483
 484     /* Colormap statistics */
 485     int i_border = -1;
 486     int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
 487
 488     pi_table[ 0 ] = p_spu->p_sys->pi_offset[ 0 ] << 1;
 489     pi_table[ 1 ] = p_spu->p_sys->pi_offset[ 1 ] << 1;
 490
 491     for( i_y = 0 ; i_y < i_height ; i_y++ )
 492     {
 493         pi_offset = pi_table + i_id;
 494
 495         for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
 496         {
 497             i_code = AddNibble( 0, p_src, pi_offset );
 498
 499             if( i_code < 0x04 )
 500             {
 501                 i_code = AddNibble( i_code, p_src, pi_offset );
 502
 503                 if( i_code < 0x10 )
 504                 {
 505                     i_code = AddNibble( i_code, p_src, pi_offset );
 506
 507                     if( i_code < 0x040 )
 508                     {
 509                         i_code = AddNibble( i_code, p_src, pi_offset );
 510
 511                         if( i_code < 0x0100 )
 512                         {
 513                             /* If the 14 first bits are set to 0, then it's a
 514                              * new line. We emulate it. */
 515                             if( i_code < 0x0004 )
 516                             {
 517                                 i_code |= ( i_width - i_x ) << 2;
 518                             }
 519                             else
 520                             {
 521                                 /* We have a boo boo ! */
 522                                 msg_Err( p_spudec->p_fifo, "unknown RLE code "
 523                                          "0x%.4x", i_code );
 524                                 return VLC_EGENERIC;
 525                             }
 526                         }
 527                     }
 528                 }
 529             }
 530
 531             if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
 532             {
 533                 msg_Err( p_spudec->p_fifo,
 534                          "out of bounds, %i at (%i,%i) is out of %ix%i",
 535                          i_code >> 2, i_x, i_y, i_width, i_height );
 536                 return VLC_EGENERIC;
 537             }
 538
 539             /* Try to find the border color */
 540             if( p_spu->p_sys->pi_alpha[ i_code & 0x3 ] != 0x00 )
 541             {
 542                 i_border = i_code & 0x3;
 543                 stats[i_border] += i_code >> 2;
 544             }
 545
 546 #if 0 /* cropping */
 547             if( (i_code >> 2) == i_width
 548                  && p_spu->p_sys->pi_alpha[ i_code & 0x3 ] == 0x00 )
 549             {
 550                 if( b_empty_top )
 551                 {
 552                     /* This is a blank top line, we skip it */
 553                     i_skipped_top++;
 554                 }
 555                 else
 556                 {
 557                     /* We can't be sure the current lines will be skipped,
 558                      * so we store the code just in case. */
 559                     *p_dest++ = i_code;
 560
 561                     b_empty_bottom = VLC_TRUE;
 562                     i_skipped_bottom++;
 563                 }
 564             }
 565             else
 566             {
 567                 /* We got a valid code, store it */
 568                 *p_dest++ = i_code;
 569
 570                 /* Valid code means no blank line */
 571                 b_empty_top = VLC_FALSE;
 572                 b_empty_bottom = VLC_FALSE;
 573                 i_skipped_bottom = 0;
 574             }
 575 #else
 576             *p_dest++ = i_code;
 577 #endif
 578         }
 579
 580         /* Check that we didn't go too far */
 581         if( i_x > i_width )
 582         {
 583             msg_Err( p_spudec->p_fifo, "i_x overflowed, %i > %i",
 584                                        i_x, i_width );
 585             return VLC_EGENERIC;
 586         }
 587
 588         /* Byte-align the stream */
 589         if( *pi_offset & 0x1 )
 590         {
 591             (*pi_offset)++;
 592         }
 593
 594         /* Swap fields */
 595         i_id = ~i_id & 0x1;
 596     }
 597
 598     /* We shouldn't get any padding bytes */
 599     if( i_y < i_height )
 600     {
 601         msg_Err( p_spudec->p_fifo, "padding bytes found in RLE sequence" );
 602         msg_Err( p_spudec->p_fifo, "send mail to <sam@zoy.org> if you "
 603                                    "want to help debugging this" );
 604
 605         /* Skip them just in case */
 606         while( i_y < i_height )
 607         {
 608             *p_dest++ = i_width << 2;
 609             i_y++;
 610         }
 611
 612         return VLC_EGENERIC;
 613     }
 614
 615     msg_Dbg( p_spudec->p_fifo, "valid subtitle, size: %ix%i, position: %i,%i",
 616              p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 617
 618 #if 0 /* cropping */
 619     /* Crop if necessary */
 620     if( i_skipped_top || i_skipped_bottom )
 621     {
 622         p_spu->i_y += i_skipped_top;
 623         p_spu->i_height -= i_skipped_top + i_skipped_bottom;
 624
 625         msg_Dbg( p_spudec->p_fifo, "cropped to: %ix%i, position: %i,%i",
 626                  p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 627     }
 628 #endif
 629
 630     /* Handle color if no palette was found */
 631     if( !p_spu->p_sys->b_palette )
 632     {
 633         int i, i_inner = -1, i_shade = -1;
 634
 635         /* Set the border color */
 636         p_spu->p_sys->pi_yuv[i_border][0] = 0x00;
 637         p_spu->p_sys->pi_yuv[i_border][1] = 0x80;
 638         p_spu->p_sys->pi_yuv[i_border][2] = 0x80;
 639         stats[i_border] = 0;
 640
 641         /* Find the inner colors */
 642         for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
 643         {
 644             if( stats[i] )
 645             {
 646                 i_inner = i;
 647             }
 648         }
 649
 650         for(       ; i < 4 && i_shade == -1 ; i++ )
 651         {
 652             if( stats[i] )
 653             {
 654                 if( stats[i] > stats[i_inner] )
 655                 {
 656                     i_shade = i_inner;
 657                     i_inner = i;
 658                 }
 659                 else
 660                 {
 661                     i_shade = i;
 662                 }
 663             }
 664         }
 665
 666         /* Set the inner color */
 667         if( i_inner != -1 )
 668         {
 669             p_spu->p_sys->pi_yuv[i_inner][0] = 0xff;
 670             p_spu->p_sys->pi_yuv[i_inner][1] = 0x80;
 671             p_spu->p_sys->pi_yuv[i_inner][2] = 0x80;
 672         }
 673
 674         /* Set the anti-aliasing color */
 675         if( i_shade != -1 )
 676         {
 677             p_spu->p_sys->pi_yuv[i_shade][0] = 0x80;
 678             p_spu->p_sys->pi_yuv[i_shade][1] = 0x80;
 679             p_spu->p_sys->pi_yuv[i_shade][2] = 0x80;
 680         }
 681
 682         msg_Dbg( p_spudec->p_fifo,
 683                  "using custom palette (border %i, inner %i, shade %i)",
 684                  i_border, i_inner, i_shade );
 685     }
 686
 687     return VLC_SUCCESS;
 688 }
 689
 690 /*****************************************************************************
 691  * DestroySPU: subpicture destructor
 692  *****************************************************************************/
 693 static void DestroySPU( subpicture_t *p_spu )
 694 {
 695     if( p_spu->p_sys->p_input )
 696     {
 697         /* Detach from our input thread */
 698         var_DelCallback( p_spu->p_sys->p_input, "highlight",
 699                          CropCallback, p_spu );
 700         vlc_object_release( p_spu->p_sys->p_input );
 701     }
 702
 703     vlc_mutex_destroy( &p_spu->p_sys->lock );
 704     free( p_spu->p_sys );
 705 }
 706
 707 /*****************************************************************************
 708  * UpdateSPU: update subpicture settings
 709  *****************************************************************************
 710  * This function is called from CropCallback and at initialization time, to
 711  * retrieve crop information from the input.
 712  *****************************************************************************/
 713 static void UpdateSPU( subpicture_t *p_spu, vlc_object_t *p_object )
 714 {
 715     vlc_value_t val;
 716
 717     if( var_Get( p_object, "highlight", &val ) )
 718     {
 719         return;
 720     }
 721
 722     p_spu->p_sys->b_crop = val.b_bool;
 723     if( !p_spu->p_sys->b_crop )
 724     {
 725         return;
 726     }
 727
 728     var_Get( p_object, "x-start", &val );
 729     p_spu->p_sys->i_x_start = val.i_int;
 730     var_Get( p_object, "y-start", &val );
 731     p_spu->p_sys->i_y_start = val.i_int;
 732     var_Get( p_object, "x-end", &val );
 733     p_spu->p_sys->i_x_end = val.i_int;
 734     var_Get( p_object, "y-end", &val );
 735     p_spu->p_sys->i_y_end = val.i_int;
 736
 737 #if 0
 738     if( var_Get( p_object, "color", &val ) == VLC_SUCCESS )
 739     {
 740         p_spu->p_sys->pi_color[0] = ((uint8_t *)val.p_address)[0];
 741         p_spu->p_sys->pi_color[1] = ((uint8_t *)val.p_address)[1];
 742         p_spu->p_sys->pi_color[2] = ((uint8_t *)val.p_address)[2];
 743         p_spu->p_sys->pi_color[3] = ((uint8_t *)val.p_address)[3];
 744     }
 745 #endif
 746
 747     if( var_Get( p_object, "contrast", &val ) == VLC_SUCCESS )
 748     {
 749         p_spu->p_sys->pi_alpha[0] = ((uint8_t *)val.p_address)[0];
 750         p_spu->p_sys->pi_alpha[1] = ((uint8_t *)val.p_address)[1];
 751         p_spu->p_sys->pi_alpha[2] = ((uint8_t *)val.p_address)[2];
 752         p_spu->p_sys->pi_alpha[3] = ((uint8_t *)val.p_address)[3];
 753     }
 754 }
 755
 756 /*****************************************************************************
 757  * CropCallback: called when the highlight properties are changed
 758  *****************************************************************************
 759  * This callback is called from the input thread when we need cropping
 760  *****************************************************************************/
 761 static int CropCallback( vlc_object_t *p_object, char const *psz_var,
 762                          vlc_value_t oldval, vlc_value_t newval, void *p_data )
 763 {
 764     UpdateSPU( (subpicture_t *)p_data, p_object );
 765
 766     return VLC_SUCCESS;
 767 }
 768