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 1.6 2002/12/06 16:34:05 sam 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 #ifndef WORDS_BIGENDIAN
 320                     p_spu->p_sys->pi_yuv[3-i][0] = (i_color>>16) & 0xff;
 321                     p_spu->p_sys->pi_yuv[3-i][1] = (i_color>>0) & 0xff;
 322                     p_spu->p_sys->pi_yuv[3-i][2] = (i_color>>8) & 0xff;
 323 #else
 324                     p_spu->p_sys->pi_yuv[3-i][0] = (i_color>>8) & 0xff;
 325                     p_spu->p_sys->pi_yuv[3-i][1] = (i_color>>24) & 0xff;
 326                     p_spu->p_sys->pi_yuv[3-i][2] = (i_color>>16) & 0xff;
 327 #endif
 328                 }
 329             }
 330             else
 331             {
 332                 RemoveBits( &p_spudec->bit_stream, 16 );
 333             }
 334             i_index += 2;
 335
 336             break;
 337
 338         case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
 339             pi_alpha[3] = GetBits( &p_spudec->bit_stream, 4 );
 340             pi_alpha[2] = GetBits( &p_spudec->bit_stream, 4 );
 341             pi_alpha[1] = GetBits( &p_spudec->bit_stream, 4 );
 342             pi_alpha[0] = GetBits( &p_spudec->bit_stream, 4 );
 343
 344             /* Ignore blank alpha palette. Sometimes spurious blank
 345              * alpha palettes are present - dunno why. */
 346             if( pi_alpha[0] | pi_alpha[1] | pi_alpha[2] | pi_alpha[3] )
 347             {
 348                 p_spu->p_sys->pi_alpha[0] = pi_alpha[0];
 349                 p_spu->p_sys->pi_alpha[1] = pi_alpha[1];
 350                 p_spu->p_sys->pi_alpha[2] = pi_alpha[2];
 351                 p_spu->p_sys->pi_alpha[3] = pi_alpha[3];
 352             }
 353             else
 354             {
 355                 msg_Warn( p_spudec->p_fifo, "ignoring blank alpha palette" );
 356             }
 357
 358             i_index += 2;
 359             break;
 360
 361         case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
 362             p_spu->i_x = GetBits( &p_spudec->bit_stream, 12 );
 363             p_spu->i_width = GetBits( &p_spudec->bit_stream, 12 )
 364                               - p_spu->i_x + 1;
 365
 366             p_spu->i_y = GetBits( &p_spudec->bit_stream, 12 );
 367             p_spu->i_height = GetBits( &p_spudec->bit_stream, 12 )
 368                                - p_spu->i_y + 1;
 369
 370             i_index += 6;
 371             break;
 372
 373         case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
 374             p_spu->p_sys->pi_offset[0] =
 375                 GetBits( &p_spudec->bit_stream, 16 ) - 4;
 376
 377             p_spu->p_sys->pi_offset[1] =
 378                 GetBits( &p_spudec->bit_stream, 16 ) - 4;
 379
 380             i_index += 4;
 381             break;
 382
 383         case SPU_CMD_END: /* ff (end) */
 384             break;
 385
 386         default: /* xx (unknown command) */
 387             msg_Err( p_spudec->p_fifo, "unknown command 0x%.2x",
 388                                        i_command );
 389             return VLC_EGENERIC;
 390         }
 391
 392         /* We need to check for quit commands here */
 393         if( p_spudec->p_fifo->b_die )
 394         {
 395             return VLC_EGENERIC;
 396         }
 397
 398     } while( i_command != SPU_CMD_END || i_index == i_next_seq );
 399
 400     /* Check that the next sequence index matches the current one */
 401     if( i_next_seq != i_cur_seq )
 402     {
 403         msg_Err( p_spudec->p_fifo, "index mismatch (0x%.4x != 0x%.4x)",
 404                                    i_next_seq, i_cur_seq );
 405         return VLC_EGENERIC;
 406     }
 407
 408     if( i_index > p_spudec->i_spu_size )
 409     {
 410         msg_Err( p_spudec->p_fifo, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
 411                                    i_index, p_spudec->i_spu_size );
 412         return VLC_EGENERIC;
 413     }
 414
 415     if( !p_spu->i_start )
 416     {
 417         msg_Err( p_spudec->p_fifo, "no `start display' command" );
 418     }
 419
 420     if( !p_spu->i_stop && !p_spu->b_ephemer )
 421     {
 422         /* This subtitle will live for 5 seconds or until the next subtitle */
 423         p_spu->i_stop = p_spu->i_start + 500 * 11000;
 424         p_spu->b_ephemer = VLC_TRUE;
 425     }
 426
 427     /* Get rid of padding bytes */
 428     switch( p_spudec->i_spu_size - i_index )
 429     {
 430         /* Zero or one padding byte, quite usual */
 431         case 1:
 432             RemoveBits( &p_spudec->bit_stream, 8 );
 433             i_index++;
 434         case 0:
 435             break;
 436
 437         /* More than one padding byte - this is very strange, but
 438          * we can deal with it */
 439         default:
 440             msg_Warn( p_spudec->p_fifo,
 441                       "%i padding bytes, we usually get 0 or 1 of them",
 442                       p_spudec->i_spu_size - i_index );
 443
 444             while( i_index < p_spudec->i_spu_size )
 445             {
 446                 RemoveBits( &p_spudec->bit_stream, 8 );
 447                 i_index++;
 448             }
 449
 450             break;
 451     }
 452
 453     /* Successfully parsed ! */
 454     return VLC_SUCCESS;
 455 }
 456
 457 /*****************************************************************************
 458  * ParseRLE: parse the RLE part of the subtitle
 459  *****************************************************************************
 460  * This part parses the subtitle graphical data and stores it in a more
 461  * convenient structure for later decoding. For more information on the
 462  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 463  *****************************************************************************/
 464 static int ParseRLE( spudec_thread_t *p_spudec,
 465                      subpicture_t * p_spu, uint8_t * p_src )
 466 {
 467     unsigned int i_code;
 468
 469     unsigned int i_width = p_spu->i_width;
 470     unsigned int i_height = p_spu->i_height;
 471     unsigned int i_x, i_y;
 472
 473     uint16_t *p_dest = (uint16_t *)p_spu->p_sys->p_data;
 474
 475     /* The subtitles are interlaced, we need two offsets */
 476     unsigned int  i_id = 0;                   /* Start on the even SPU layer */
 477     unsigned int  pi_table[ 2 ];
 478     unsigned int *pi_offset;
 479
 480 #if 0 /* cropping */
 481     vlc_bool_t b_empty_top = VLC_TRUE,
 482                b_empty_bottom = VLC_FALSE;
 483     unsigned int i_skipped_top = 0,
 484                  i_skipped_bottom = 0;
 485 #endif
 486
 487     /* Colormap statistics */
 488     int i_border = -1;
 489     int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
 490
 491     pi_table[ 0 ] = p_spu->p_sys->pi_offset[ 0 ] << 1;
 492     pi_table[ 1 ] = p_spu->p_sys->pi_offset[ 1 ] << 1;
 493
 494     for( i_y = 0 ; i_y < i_height ; i_y++ )
 495     {
 496         pi_offset = pi_table + i_id;
 497
 498         for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
 499         {
 500             i_code = AddNibble( 0, p_src, pi_offset );
 501
 502             if( i_code < 0x04 )
 503             {
 504                 i_code = AddNibble( i_code, p_src, pi_offset );
 505
 506                 if( i_code < 0x10 )
 507                 {
 508                     i_code = AddNibble( i_code, p_src, pi_offset );
 509
 510                     if( i_code < 0x040 )
 511                     {
 512                         i_code = AddNibble( i_code, p_src, pi_offset );
 513
 514                         if( i_code < 0x0100 )
 515                         {
 516                             /* If the 14 first bits are set to 0, then it's a
 517                              * new line. We emulate it. */
 518                             if( i_code < 0x0004 )
 519                             {
 520                                 i_code |= ( i_width - i_x ) << 2;
 521                             }
 522                             else
 523                             {
 524                                 /* We have a boo boo ! */
 525                                 msg_Err( p_spudec->p_fifo, "unknown RLE code "
 526                                          "0x%.4x", i_code );
 527                                 return VLC_EGENERIC;
 528                             }
 529                         }
 530                     }
 531                 }
 532             }
 533
 534             if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
 535             {
 536                 msg_Err( p_spudec->p_fifo,
 537                          "out of bounds, %i at (%i,%i) is out of %ix%i",
 538                          i_code >> 2, i_x, i_y, i_width, i_height );
 539                 return VLC_EGENERIC;
 540             }
 541
 542             /* Try to find the border color */
 543             if( p_spu->p_sys->pi_alpha[ i_code & 0x3 ] != 0x00 )
 544             {
 545                 i_border = i_code & 0x3;
 546                 stats[i_border] += i_code >> 2;
 547             }
 548
 549 #if 0 /* cropping */
 550             if( (i_code >> 2) == i_width
 551                  && p_spu->p_sys->pi_alpha[ i_code & 0x3 ] == 0x00 )
 552             {
 553                 if( b_empty_top )
 554                 {
 555                     /* This is a blank top line, we skip it */
 556                     i_skipped_top++;
 557                 }
 558                 else
 559                 {
 560                     /* We can't be sure the current lines will be skipped,
 561                      * so we store the code just in case. */
 562                     *p_dest++ = i_code;
 563
 564                     b_empty_bottom = VLC_TRUE;
 565                     i_skipped_bottom++;
 566                 }
 567             }
 568             else
 569             {
 570                 /* We got a valid code, store it */
 571                 *p_dest++ = i_code;
 572
 573                 /* Valid code means no blank line */
 574                 b_empty_top = VLC_FALSE;
 575                 b_empty_bottom = VLC_FALSE;
 576                 i_skipped_bottom = 0;
 577             }
 578 #else
 579             *p_dest++ = i_code;
 580 #endif
 581         }
 582
 583         /* Check that we didn't go too far */
 584         if( i_x > i_width )
 585         {
 586             msg_Err( p_spudec->p_fifo, "i_x overflowed, %i > %i",
 587                                        i_x, i_width );
 588             return VLC_EGENERIC;
 589         }
 590
 591         /* Byte-align the stream */
 592         if( *pi_offset & 0x1 )
 593         {
 594             (*pi_offset)++;
 595         }
 596
 597         /* Swap fields */
 598         i_id = ~i_id & 0x1;
 599     }
 600
 601     /* We shouldn't get any padding bytes */
 602     if( i_y < i_height )
 603     {
 604         msg_Err( p_spudec->p_fifo, "padding bytes found in RLE sequence" );
 605         msg_Err( p_spudec->p_fifo, "send mail to <sam@zoy.org> if you "
 606                                    "want to help debugging this" );
 607
 608         /* Skip them just in case */
 609         while( i_y < i_height )
 610         {
 611             *p_dest++ = i_width << 2;
 612             i_y++;
 613         }
 614
 615         return VLC_EGENERIC;
 616     }
 617
 618     msg_Dbg( p_spudec->p_fifo, "valid subtitle, size: %ix%i, position: %i,%i",
 619              p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 620
 621 #if 0 /* cropping */
 622     /* Crop if necessary */
 623     if( i_skipped_top || i_skipped_bottom )
 624     {
 625         p_spu->i_y += i_skipped_top;
 626         p_spu->i_height -= i_skipped_top + i_skipped_bottom;
 627
 628         msg_Dbg( p_spudec->p_fifo, "cropped to: %ix%i, position: %i,%i",
 629                  p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 630     }
 631 #endif
 632
 633     /* Handle color if no palette was found */
 634     if( !p_spu->p_sys->b_palette )
 635     {
 636         int i, i_inner = -1, i_shade = -1;
 637
 638         /* Set the border color */
 639         p_spu->p_sys->pi_yuv[i_border][0] = 0x00;
 640         p_spu->p_sys->pi_yuv[i_border][1] = 0x80;
 641         p_spu->p_sys->pi_yuv[i_border][2] = 0x80;
 642         stats[i_border] = 0;
 643
 644         /* Find the inner colors */
 645         for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
 646         {
 647             if( stats[i] )
 648             {
 649                 i_inner = i;
 650             }
 651         }
 652
 653         for(       ; i < 4 && i_shade == -1 ; i++ )
 654         {
 655             if( stats[i] )
 656             {
 657                 if( stats[i] > stats[i_inner] )
 658                 {
 659                     i_shade = i_inner;
 660                     i_inner = i;
 661                 }
 662                 else
 663                 {
 664                     i_shade = i;
 665                 }
 666             }
 667         }
 668
 669         /* Set the inner color */
 670         if( i_inner != -1 )
 671         {
 672             p_spu->p_sys->pi_yuv[i_inner][0] = 0xff;
 673             p_spu->p_sys->pi_yuv[i_inner][1] = 0x80;
 674             p_spu->p_sys->pi_yuv[i_inner][2] = 0x80;
 675         }
 676
 677         /* Set the anti-aliasing color */
 678         if( i_shade != -1 )
 679         {
 680             p_spu->p_sys->pi_yuv[i_shade][0] = 0x80;
 681             p_spu->p_sys->pi_yuv[i_shade][1] = 0x80;
 682             p_spu->p_sys->pi_yuv[i_shade][2] = 0x80;
 683         }
 684
 685         msg_Dbg( p_spudec->p_fifo,
 686                  "using custom palette (border %i, inner %i, shade %i)",
 687                  i_border, i_inner, i_shade );
 688     }
 689
 690     return VLC_SUCCESS;
 691 }
 692
 693 /*****************************************************************************
 694  * DestroySPU: subpicture destructor
 695  *****************************************************************************/
 696 static void DestroySPU( subpicture_t *p_spu )
 697 {
 698     if( p_spu->p_sys->p_input )
 699     {
 700         /* Detach from our input thread */
 701         var_DelCallback( p_spu->p_sys->p_input, "highlight",
 702                          CropCallback, p_spu );
 703         vlc_object_release( p_spu->p_sys->p_input );
 704     }
 705
 706     vlc_mutex_destroy( &p_spu->p_sys->lock );
 707     free( p_spu->p_sys );
 708 }
 709
 710 /*****************************************************************************
 711  * UpdateSPU: update subpicture settings
 712  *****************************************************************************
 713  * This function is called from CropCallback and at initialization time, to
 714  * retrieve crop information from the input.
 715  *****************************************************************************/
 716 static void UpdateSPU( subpicture_t *p_spu, vlc_object_t *p_object )
 717 {
 718     vlc_value_t val;
 719
 720     if( var_Get( p_object, "highlight", &val ) )
 721     {
 722         return;
 723     }
 724
 725     p_spu->p_sys->b_crop = val.b_bool;
 726     if( !p_spu->p_sys->b_crop )
 727     {
 728         return;
 729     }
 730
 731     var_Get( p_object, "x-start", &val );
 732     p_spu->p_sys->i_x_start = val.i_int;
 733     var_Get( p_object, "y-start", &val );
 734     p_spu->p_sys->i_y_start = val.i_int;
 735     var_Get( p_object, "x-end", &val );
 736     p_spu->p_sys->i_x_end = val.i_int;
 737     var_Get( p_object, "y-end", &val );
 738     p_spu->p_sys->i_y_end = val.i_int;
 739
 740 #if 0
 741     if( var_Get( p_object, "color", &val ) == VLC_SUCCESS )
 742     {
 743         p_spu->p_sys->pi_color[0] = ((uint8_t *)val.p_address)[0];
 744         p_spu->p_sys->pi_color[1] = ((uint8_t *)val.p_address)[1];
 745         p_spu->p_sys->pi_color[2] = ((uint8_t *)val.p_address)[2];
 746         p_spu->p_sys->pi_color[3] = ((uint8_t *)val.p_address)[3];
 747     }
 748 #endif
 749
 750     if( var_Get( p_object, "contrast", &val ) == VLC_SUCCESS )
 751     {
 752         p_spu->p_sys->pi_alpha[0] = ((uint8_t *)val.p_address)[0];
 753         p_spu->p_sys->pi_alpha[1] = ((uint8_t *)val.p_address)[1];
 754         p_spu->p_sys->pi_alpha[2] = ((uint8_t *)val.p_address)[2];
 755         p_spu->p_sys->pi_alpha[3] = ((uint8_t *)val.p_address)[3];
 756     }
 757 }
 758
 759 /*****************************************************************************
 760  * CropCallback: called when the highlight properties are changed
 761  *****************************************************************************
 762  * This callback is called from the input thread when we need cropping
 763  *****************************************************************************/
 764 static int CropCallback( vlc_object_t *p_object, char const *psz_var,
 765                          vlc_value_t oldval, vlc_value_t newval, void *p_data )
 766 {
 767     UpdateSPU( (subpicture_t *)p_data, p_object );
 768
 769     return VLC_SUCCESS;
 770 }
 771