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 1.8 2003/01/09 10:12:42 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 ) * 11000
 275                     * p_spudec->bit_stream.p_pes->i_rate / DEFAULT_RATE;
 276
 277             /* Next offset */
 278             i_cur_seq = i_index;
 279             i_next_seq = GetBits( &p_spudec->bit_stream, 16 );
 280
 281             /* Skip what we just read */
 282             i_index += 4;
 283         }
 284
 285         i_command = GetBits( &p_spudec->bit_stream, 8 );
 286         i_index++;
 287
 288         switch( i_command )
 289         {
 290         case SPU_CMD_FORCE_DISPLAY: /* 00 (force displaying) */
 291             p_spu->i_start = p_spu->p_sys->i_pts + date;
 292             p_spu->b_ephemer = VLC_TRUE;
 293             break;
 294
 295         /* Convert the dates in seconds to PTS values */
 296         case SPU_CMD_START_DISPLAY: /* 01 (start displaying) */
 297             p_spu->i_start = p_spu->p_sys->i_pts + date;
 298             break;
 299
 300         case SPU_CMD_STOP_DISPLAY: /* 02 (stop displaying) */
 301             p_spu->i_stop = p_spu->p_sys->i_pts + date;
 302             break;
 303
 304         case SPU_CMD_SET_PALETTE:
 305
 306             /* 03xxxx (palette) */
 307             if( p_spudec->p_fifo->p_demux_data
 308                  && *(int*)p_spudec->p_fifo->p_demux_data == 0xBeeF )
 309             {
 310                 uint32_t i_color;
 311
 312                 p_spu->p_sys->b_palette = VLC_TRUE;
 313                 for( i = 0; i < 4 ; i++ )
 314                 {
 315                     i_color = ((uint32_t*)((char*)p_spudec->p_fifo->
 316                                 p_demux_data + sizeof(int)))[
 317                                   GetBits(&p_spudec->bit_stream, 4) ];
 318
 319                     /* FIXME: this job should be done sooner */
 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                 }
 324             }
 325             else
 326             {
 327                 RemoveBits( &p_spudec->bit_stream, 16 );
 328             }
 329             i_index += 2;
 330
 331             break;
 332
 333         case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
 334             pi_alpha[3] = GetBits( &p_spudec->bit_stream, 4 );
 335             pi_alpha[2] = GetBits( &p_spudec->bit_stream, 4 );
 336             pi_alpha[1] = GetBits( &p_spudec->bit_stream, 4 );
 337             pi_alpha[0] = GetBits( &p_spudec->bit_stream, 4 );
 338
 339             /* Ignore blank alpha palette. Sometimes spurious blank
 340              * alpha palettes are present - dunno why. */
 341             if( pi_alpha[0] | pi_alpha[1] | pi_alpha[2] | pi_alpha[3] )
 342             {
 343                 p_spu->p_sys->pi_alpha[0] = pi_alpha[0];
 344                 p_spu->p_sys->pi_alpha[1] = pi_alpha[1];
 345                 p_spu->p_sys->pi_alpha[2] = pi_alpha[2];
 346                 p_spu->p_sys->pi_alpha[3] = pi_alpha[3];
 347             }
 348             else
 349             {
 350                 msg_Warn( p_spudec->p_fifo, "ignoring blank alpha palette" );
 351             }
 352
 353             i_index += 2;
 354             break;
 355
 356         case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
 357             p_spu->i_x = GetBits( &p_spudec->bit_stream, 12 );
 358             p_spu->i_width = GetBits( &p_spudec->bit_stream, 12 )
 359                               - p_spu->i_x + 1;
 360
 361             p_spu->i_y = GetBits( &p_spudec->bit_stream, 12 );
 362             p_spu->i_height = GetBits( &p_spudec->bit_stream, 12 )
 363                                - p_spu->i_y + 1;
 364
 365             i_index += 6;
 366             break;
 367
 368         case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
 369             p_spu->p_sys->pi_offset[0] =
 370                 GetBits( &p_spudec->bit_stream, 16 ) - 4;
 371
 372             p_spu->p_sys->pi_offset[1] =
 373                 GetBits( &p_spudec->bit_stream, 16 ) - 4;
 374
 375             i_index += 4;
 376             break;
 377
 378         case SPU_CMD_END: /* ff (end) */
 379             break;
 380
 381         default: /* xx (unknown command) */
 382             msg_Err( p_spudec->p_fifo, "unknown command 0x%.2x",
 383                                        i_command );
 384             return VLC_EGENERIC;
 385         }
 386
 387         /* We need to check for quit commands here */
 388         if( p_spudec->p_fifo->b_die )
 389         {
 390             return VLC_EGENERIC;
 391         }
 392
 393     } while( i_command != SPU_CMD_END || i_index == i_next_seq );
 394
 395     /* Check that the next sequence index matches the current one */
 396     if( i_next_seq != i_cur_seq )
 397     {
 398         msg_Err( p_spudec->p_fifo, "index mismatch (0x%.4x != 0x%.4x)",
 399                                    i_next_seq, i_cur_seq );
 400         return VLC_EGENERIC;
 401     }
 402
 403     if( i_index > p_spudec->i_spu_size )
 404     {
 405         msg_Err( p_spudec->p_fifo, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
 406                                    i_index, p_spudec->i_spu_size );
 407         return VLC_EGENERIC;
 408     }
 409
 410     if( !p_spu->i_start )
 411     {
 412         msg_Err( p_spudec->p_fifo, "no `start display' command" );
 413     }
 414
 415     if( p_spu->i_stop <= p_spu->i_start && !p_spu->b_ephemer )
 416     {
 417         /* This subtitle will live for 5 seconds or until the next subtitle */
 418         p_spu->i_stop = p_spu->i_start + 500 * 11000
 419                          * p_spudec->bit_stream.p_pes->i_rate / DEFAULT_RATE;;
 420         p_spu->b_ephemer = VLC_TRUE;
 421     }
 422
 423     /* Get rid of padding bytes */
 424     switch( p_spudec->i_spu_size - i_index )
 425     {
 426         /* Zero or one padding byte, quite usual */
 427         case 1:
 428             RemoveBits( &p_spudec->bit_stream, 8 );
 429             i_index++;
 430         case 0:
 431             break;
 432
 433         /* More than one padding byte - this is very strange, but
 434          * we can deal with it */
 435         default:
 436             msg_Warn( p_spudec->p_fifo,
 437                       "%i padding bytes, we usually get 0 or 1 of them",
 438                       p_spudec->i_spu_size - i_index );
 439
 440             while( i_index < p_spudec->i_spu_size )
 441             {
 442                 RemoveBits( &p_spudec->bit_stream, 8 );
 443                 i_index++;
 444             }
 445
 446             break;
 447     }
 448
 449     /* Successfully parsed ! */
 450     return VLC_SUCCESS;
 451 }
 452
 453 /*****************************************************************************
 454  * ParseRLE: parse the RLE part of the subtitle
 455  *****************************************************************************
 456  * This part parses the subtitle graphical data and stores it in a more
 457  * convenient structure for later decoding. For more information on the
 458  * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
 459  *****************************************************************************/
 460 static int ParseRLE( spudec_thread_t *p_spudec,
 461                      subpicture_t * p_spu, uint8_t * p_src )
 462 {
 463     unsigned int i_code;
 464
 465     unsigned int i_width = p_spu->i_width;
 466     unsigned int i_height = p_spu->i_height;
 467     unsigned int i_x, i_y;
 468
 469     uint16_t *p_dest = (uint16_t *)p_spu->p_sys->p_data;
 470
 471     /* The subtitles are interlaced, we need two offsets */
 472     unsigned int  i_id = 0;                   /* Start on the even SPU layer */
 473     unsigned int  pi_table[ 2 ];
 474     unsigned int *pi_offset;
 475
 476 #if 0 /* cropping */
 477     vlc_bool_t b_empty_top = VLC_TRUE,
 478                b_empty_bottom = VLC_FALSE;
 479     unsigned int i_skipped_top = 0,
 480                  i_skipped_bottom = 0;
 481 #endif
 482
 483     /* Colormap statistics */
 484     int i_border = -1;
 485     int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
 486
 487     pi_table[ 0 ] = p_spu->p_sys->pi_offset[ 0 ] << 1;
 488     pi_table[ 1 ] = p_spu->p_sys->pi_offset[ 1 ] << 1;
 489
 490     for( i_y = 0 ; i_y < i_height ; i_y++ )
 491     {
 492         pi_offset = pi_table + i_id;
 493
 494         for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
 495         {
 496             i_code = AddNibble( 0, p_src, pi_offset );
 497
 498             if( i_code < 0x04 )
 499             {
 500                 i_code = AddNibble( i_code, p_src, pi_offset );
 501
 502                 if( i_code < 0x10 )
 503                 {
 504                     i_code = AddNibble( i_code, p_src, pi_offset );
 505
 506                     if( i_code < 0x040 )
 507                     {
 508                         i_code = AddNibble( i_code, p_src, pi_offset );
 509
 510                         if( i_code < 0x0100 )
 511                         {
 512                             /* If the 14 first bits are set to 0, then it's a
 513                              * new line. We emulate it. */
 514                             if( i_code < 0x0004 )
 515                             {
 516                                 i_code |= ( i_width - i_x ) << 2;
 517                             }
 518                             else
 519                             {
 520                                 /* We have a boo boo ! */
 521                                 msg_Err( p_spudec->p_fifo, "unknown RLE code "
 522                                          "0x%.4x", i_code );
 523                                 return VLC_EGENERIC;
 524                             }
 525                         }
 526                     }
 527                 }
 528             }
 529
 530             if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
 531             {
 532                 msg_Err( p_spudec->p_fifo,
 533                          "out of bounds, %i at (%i,%i) is out of %ix%i",
 534                          i_code >> 2, i_x, i_y, i_width, i_height );
 535                 return VLC_EGENERIC;
 536             }
 537
 538             /* Try to find the border color */
 539             if( p_spu->p_sys->pi_alpha[ i_code & 0x3 ] != 0x00 )
 540             {
 541                 i_border = i_code & 0x3;
 542                 stats[i_border] += i_code >> 2;
 543             }
 544
 545 #if 0 /* cropping */
 546             if( (i_code >> 2) == i_width
 547                  && p_spu->p_sys->pi_alpha[ i_code & 0x3 ] == 0x00 )
 548             {
 549                 if( b_empty_top )
 550                 {
 551                     /* This is a blank top line, we skip it */
 552                     i_skipped_top++;
 553                 }
 554                 else
 555                 {
 556                     /* We can't be sure the current lines will be skipped,
 557                      * so we store the code just in case. */
 558                     *p_dest++ = i_code;
 559
 560                     b_empty_bottom = VLC_TRUE;
 561                     i_skipped_bottom++;
 562                 }
 563             }
 564             else
 565             {
 566                 /* We got a valid code, store it */
 567                 *p_dest++ = i_code;
 568
 569                 /* Valid code means no blank line */
 570                 b_empty_top = VLC_FALSE;
 571                 b_empty_bottom = VLC_FALSE;
 572                 i_skipped_bottom = 0;
 573             }
 574 #else
 575             *p_dest++ = i_code;
 576 #endif
 577         }
 578
 579         /* Check that we didn't go too far */
 580         if( i_x > i_width )
 581         {
 582             msg_Err( p_spudec->p_fifo, "i_x overflowed, %i > %i",
 583                                        i_x, i_width );
 584             return VLC_EGENERIC;
 585         }
 586
 587         /* Byte-align the stream */
 588         if( *pi_offset & 0x1 )
 589         {
 590             (*pi_offset)++;
 591         }
 592
 593         /* Swap fields */
 594         i_id = ~i_id & 0x1;
 595     }
 596
 597     /* We shouldn't get any padding bytes */
 598     if( i_y < i_height )
 599     {
 600         msg_Err( p_spudec->p_fifo, "padding bytes found in RLE sequence" );
 601         msg_Err( p_spudec->p_fifo, "send mail to <sam@zoy.org> if you "
 602                                    "want to help debugging this" );
 603
 604         /* Skip them just in case */
 605         while( i_y < i_height )
 606         {
 607             *p_dest++ = i_width << 2;
 608             i_y++;
 609         }
 610
 611         return VLC_EGENERIC;
 612     }
 613
 614     msg_Dbg( p_spudec->p_fifo, "valid subtitle, size: %ix%i, position: %i,%i",
 615              p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 616
 617 #if 0 /* cropping */
 618     /* Crop if necessary */
 619     if( i_skipped_top || i_skipped_bottom )
 620     {
 621         p_spu->i_y += i_skipped_top;
 622         p_spu->i_height -= i_skipped_top + i_skipped_bottom;
 623
 624         msg_Dbg( p_spudec->p_fifo, "cropped to: %ix%i, position: %i,%i",
 625                  p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
 626     }
 627 #endif
 628
 629     /* Handle color if no palette was found */
 630     if( !p_spu->p_sys->b_palette )
 631     {
 632         int i, i_inner = -1, i_shade = -1;
 633
 634         /* Set the border color */
 635         p_spu->p_sys->pi_yuv[i_border][0] = 0x00;
 636         p_spu->p_sys->pi_yuv[i_border][1] = 0x80;
 637         p_spu->p_sys->pi_yuv[i_border][2] = 0x80;
 638         stats[i_border] = 0;
 639
 640         /* Find the inner colors */
 641         for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
 642         {
 643             if( stats[i] )
 644             {
 645                 i_inner = i;
 646             }
 647         }
 648
 649         for(       ; i < 4 && i_shade == -1 ; i++ )
 650         {
 651             if( stats[i] )
 652             {
 653                 if( stats[i] > stats[i_inner] )
 654                 {
 655                     i_shade = i_inner;
 656                     i_inner = i;
 657                 }
 658                 else
 659                 {
 660                     i_shade = i;
 661                 }
 662             }
 663         }
 664
 665         /* Set the inner color */
 666         if( i_inner != -1 )
 667         {
 668             p_spu->p_sys->pi_yuv[i_inner][0] = 0xff;
 669             p_spu->p_sys->pi_yuv[i_inner][1] = 0x80;
 670             p_spu->p_sys->pi_yuv[i_inner][2] = 0x80;
 671         }
 672
 673         /* Set the anti-aliasing color */
 674         if( i_shade != -1 )
 675         {
 676             p_spu->p_sys->pi_yuv[i_shade][0] = 0x80;
 677             p_spu->p_sys->pi_yuv[i_shade][1] = 0x80;
 678             p_spu->p_sys->pi_yuv[i_shade][2] = 0x80;
 679         }
 680
 681         msg_Dbg( p_spudec->p_fifo,
 682                  "using custom palette (border %i, inner %i, shade %i)",
 683                  i_border, i_inner, i_shade );
 684     }
 685
 686     return VLC_SUCCESS;
 687 }
 688
 689 /*****************************************************************************
 690  * DestroySPU: subpicture destructor
 691  *****************************************************************************/
 692 static void DestroySPU( subpicture_t *p_spu )
 693 {
 694     if( p_spu->p_sys->p_input )
 695     {
 696         /* Detach from our input thread */
 697         var_DelCallback( p_spu->p_sys->p_input, "highlight",
 698                          CropCallback, p_spu );
 699         vlc_object_release( p_spu->p_sys->p_input );
 700     }
 701
 702     vlc_mutex_destroy( &p_spu->p_sys->lock );
 703     free( p_spu->p_sys );
 704 }
 705
 706 /*****************************************************************************
 707  * UpdateSPU: update subpicture settings
 708  *****************************************************************************
 709  * This function is called from CropCallback and at initialization time, to
 710  * retrieve crop information from the input.
 711  *****************************************************************************/
 712 static void UpdateSPU( subpicture_t *p_spu, vlc_object_t *p_object )
 713 {
 714     vlc_value_t val;
 715
 716     if( var_Get( p_object, "highlight", &val ) )
 717     {
 718         return;
 719     }
 720
 721     p_spu->p_sys->b_crop = val.b_bool;
 722     if( !p_spu->p_sys->b_crop )
 723     {
 724         return;
 725     }
 726
 727     var_Get( p_object, "x-start", &val );
 728     p_spu->p_sys->i_x_start = val.i_int;
 729     var_Get( p_object, "y-start", &val );
 730     p_spu->p_sys->i_y_start = val.i_int;
 731     var_Get( p_object, "x-end", &val );
 732     p_spu->p_sys->i_x_end = val.i_int;
 733     var_Get( p_object, "y-end", &val );
 734     p_spu->p_sys->i_y_end = val.i_int;
 735
 736 #if 0
 737     if( var_Get( p_object, "color", &val ) == VLC_SUCCESS )
 738     {
 739         p_spu->p_sys->pi_color[0] = ((uint8_t *)val.p_address)[0];
 740         p_spu->p_sys->pi_color[1] = ((uint8_t *)val.p_address)[1];
 741         p_spu->p_sys->pi_color[2] = ((uint8_t *)val.p_address)[2];
 742         p_spu->p_sys->pi_color[3] = ((uint8_t *)val.p_address)[3];
 743     }
 744 #endif
 745
 746     if( var_Get( p_object, "contrast", &val ) == VLC_SUCCESS )
 747     {
 748         p_spu->p_sys->pi_alpha[0] = ((uint8_t *)val.p_address)[0];
 749         p_spu->p_sys->pi_alpha[1] = ((uint8_t *)val.p_address)[1];
 750         p_spu->p_sys->pi_alpha[2] = ((uint8_t *)val.p_address)[2];
 751         p_spu->p_sys->pi_alpha[3] = ((uint8_t *)val.p_address)[3];
 752     }
 753 }
 754
 755 /*****************************************************************************
 756  * CropCallback: called when the highlight properties are changed
 757  *****************************************************************************
 758  * This callback is called from the input thread when we need cropping
 759  *****************************************************************************/
 760 static int CropCallback( vlc_object_t *p_object, char const *psz_var,
 761                          vlc_value_t oldval, vlc_value_t newval, void *p_data )
 762 {
 763     UpdateSPU( (subpicture_t *)p_data, p_object );
 764
 765     return VLC_SUCCESS;
 766 }
 767