modules/codec/cvdsub.c

   1 /*****************************************************************************
   2  * cvd.c : CVD Subtitle decoder
   3  *****************************************************************************
   4  * Copyright (C) 2003, 2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Rocky Bernstein
   8  *          Gildas Bazin <gbazin@videolan.org>
   9  *          Julio Sanchez Fernandez (http://subhandler.sourceforge.net)
  10  *          Laurent Aimar <fenrir@via.ecp.fr>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #include <vlc/vlc.h>
  31 #include <vlc_vout.h>
  32 #include <vlc_codec.h>
  33
  34 #include "vlc_bits.h"
  35
  36 #define DEBUG_CVDSUB 1
  37
  38 /*****************************************************************************
  39  * Module descriptor.
  40  *****************************************************************************/
  41 static int  DecoderOpen   ( vlc_object_t * );
  42 static int  PacketizerOpen( vlc_object_t * );
  43 static void DecoderClose  ( vlc_object_t * );
  44
  45 vlc_module_begin();
  46     set_description( _("CVD subtitle decoder") );
  47     set_capability( "decoder", 50 );
  48     set_callbacks( DecoderOpen, DecoderClose );
  49
  50     add_submodule();
  51     set_description( _("Chaoji VCD subtitle packetizer") );
  52     set_capability( "packetizer", 50 );
  53     set_callbacks( PacketizerOpen, DecoderClose );
  54 vlc_module_end();
  55
  56 /*****************************************************************************
  57  * Local prototypes
  58  *****************************************************************************/
  59 static subpicture_t *Decode( decoder_t *, block_t ** );
  60 static block_t *Packetize  ( decoder_t *, block_t ** );
  61 static block_t *Reassemble ( decoder_t *, block_t * );
  62 static void ParseMetaInfo  ( decoder_t *, block_t * );
  63 static void ParseHeader    ( decoder_t *, block_t * );
  64 static subpicture_t *DecodePacket( decoder_t *, block_t * );
  65 static void RenderImage( decoder_t *, block_t *, subpicture_region_t * );
  66
  67 #define SUBTITLE_BLOCK_EMPTY 0
  68 #define SUBTITLE_BLOCK_PARTIAL 1
  69 #define SUBTITLE_BLOCK_COMPLETE 2
  70
  71 struct decoder_sys_t
  72 {
  73   int      b_packetizer;
  74
  75   int      i_state;    /* data-gathering state for this subtitle */
  76
  77   block_t  *p_spu;   /* Bytes of the packet. */
  78
  79   int     i_spu_size;     /* goal for subtitle_data_pos while gathering,
  80                              size of used subtitle_data later */
  81
  82   uint16_t i_image_offset;      /* offset from subtitle_data to compressed
  83                                    image data */
  84   int i_image_length;           /* size of the compressed image data */
  85   int first_field_offset;       /* offset of even raster lines */
  86   int second_field_offset;      /* offset of odd raster lines */
  87   int metadata_offset;          /* offset to data describing the image */
  88   int metadata_length;          /* length of metadata */
  89
  90   mtime_t i_duration;   /* how long to display the image, 0 stands
  91                            for "until next subtitle" */
  92
  93   uint16_t i_x_start, i_y_start; /* position of top leftmost pixel of
  94                                     image when displayed */
  95   uint16_t i_width, i_height;    /* dimensions in pixels of image */
  96
  97   uint8_t p_palette[4][4];       /* Palette of colors used in subtitle */
  98   uint8_t p_palette_highlight[4][4];
  99 };
 100
 101 /*****************************************************************************
 102  * DecoderOpen: open/initialize the cvdsub decoder.
 103  *****************************************************************************/
 104 static int DecoderOpen( vlc_object_t *p_this )
 105 {
 106     decoder_t     *p_dec = (decoder_t*)p_this;
 107     decoder_sys_t *p_sys;
 108
 109     if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'c','v','d',' ' ) )
 110     {
 111         return VLC_EGENERIC;
 112     }
 113
 114     p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
 115
 116     p_sys->b_packetizer  = VLC_FALSE;
 117
 118     p_sys->i_state = SUBTITLE_BLOCK_EMPTY;
 119     p_sys->p_spu   = NULL;
 120
 121     es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 'c','v','d',' ' ) );
 122
 123     p_dec->pf_decode_sub = Decode;
 124     p_dec->pf_packetize  = Packetize;
 125
 126     return VLC_SUCCESS;
 127 }
 128
 129 /*****************************************************************************
 130  * PacketizerOpen: open/initialize the cvdsub packetizer.
 131  *****************************************************************************/
 132 static int PacketizerOpen( vlc_object_t *p_this )
 133 {
 134     decoder_t *p_dec = (decoder_t*)p_this;
 135
 136     if( DecoderOpen( p_this ) != VLC_SUCCESS ) return VLC_EGENERIC;
 137
 138     p_dec->p_sys->b_packetizer = VLC_TRUE;
 139
 140     return VLC_SUCCESS;
 141 }
 142
 143 /*****************************************************************************
 144  * DecoderClose: closes the cvdsub decoder/packetizer.
 145  *****************************************************************************/
 146 void DecoderClose( vlc_object_t *p_this )
 147 {
 148     decoder_t     *p_dec = (decoder_t*)p_this;
 149     decoder_sys_t *p_sys = p_dec->p_sys;
 150
 151     if( p_sys->p_spu ) block_ChainRelease( p_sys->p_spu );
 152     free( p_sys );
 153 }
 154
 155 /*****************************************************************************
 156  * Decode:
 157  *****************************************************************************/
 158 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
 159 {
 160     block_t *p_block, *p_spu;
 161
 162     if( pp_block == NULL || *pp_block == NULL ) return NULL;
 163
 164     p_block = *pp_block;
 165     *pp_block = NULL;
 166
 167     if( !(p_spu = Reassemble( p_dec, p_block )) ) return NULL;
 168
 169     /* Parse and decode */
 170     return DecodePacket( p_dec, p_spu );
 171 }
 172
 173 /*****************************************************************************
 174  * Packetize:
 175  *****************************************************************************/
 176 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
 177 {
 178     block_t *p_block, *p_spu;
 179
 180     if( pp_block == NULL || *pp_block == NULL ) return NULL;
 181
 182     p_block = *pp_block;
 183     *pp_block = NULL;
 184
 185     if( !(p_spu = Reassemble( p_dec, p_block )) ) return NULL;
 186
 187     p_spu->i_dts = p_spu->i_pts;
 188     p_spu->i_length = 0;
 189
 190     return p_spu;
 191 }
 192
 193
 194 /*****************************************************************************
 195  Reassemble:
 196
 197  Data for single screen subtitle may come in several non-contiguous
 198  packets of a stream. This routine is called when the next packet in
 199  the stream comes in. The job of this routine is to parse the header,
 200  if this is the beginning, and combine the packets into one complete
 201  subtitle unit.
 202
 203  If everything is complete, we will return a block. Otherwise return
 204  NULL.
 205
 206  *****************************************************************************/
 207 #define SPU_HEADER_LEN 1
 208
 209 static block_t *Reassemble( decoder_t *p_dec, block_t *p_block )
 210 {
 211     decoder_sys_t *p_sys = p_dec->p_sys;
 212     uint8_t *p_buffer;
 213
 214     if( p_block->i_buffer < SPU_HEADER_LEN )
 215     {
 216         msg_Dbg( p_dec, "invalid packet header (size %d < %d)" ,
 217                  p_block->i_buffer, SPU_HEADER_LEN );
 218         block_Release( p_block );
 219         return NULL;
 220     }
 221
 222     p_buffer = p_block->p_buffer;
 223
 224     /* From the scant data on the format, there is only only way known
 225      * to detect the first packet in a subtitle.  The first packet
 226      * seems to have a valid PTS while later packets for the same
 227      * image don't. */
 228     if( p_sys->i_state == SUBTITLE_BLOCK_EMPTY && p_block->i_pts == 0 )
 229     {
 230         msg_Warn( p_dec, "first packet expected but no PTS present");
 231         return NULL;
 232     }
 233
 234     p_block->p_buffer += SPU_HEADER_LEN;
 235     p_block->i_buffer -= SPU_HEADER_LEN;
 236
 237     /* First packet in the subtitle block */
 238     if( p_sys->i_state == SUBTITLE_BLOCK_EMPTY ) ParseHeader( p_dec, p_block );
 239
 240     block_ChainAppend( &p_sys->p_spu, p_block );
 241     p_sys->p_spu = block_ChainGather( p_sys->p_spu );
 242
 243     if( p_sys->p_spu->i_buffer >= p_sys->i_spu_size )
 244     {
 245         block_t *p_spu = p_sys->p_spu;
 246
 247         if( p_spu->i_buffer != p_sys->i_spu_size )
 248         {
 249             msg_Warn( p_dec, "SPU packets size=%d should be %d",
 250                       p_spu->i_buffer, p_sys->i_spu_size );
 251         }
 252
 253         msg_Dbg( p_dec, "subtitle packet complete, size=%d", p_spu->i_buffer);
 254
 255         ParseMetaInfo( p_dec, p_spu );
 256
 257         p_sys->i_state = SUBTITLE_BLOCK_EMPTY;
 258         p_sys->p_spu = 0;
 259         return p_spu;
 260     }
 261     else
 262     {
 263         /* Not last block in subtitle, so wait for another. */
 264         p_sys->i_state = SUBTITLE_BLOCK_PARTIAL;
 265     }
 266
 267     return NULL;
 268 }
 269
 270 /*
 271   We do not have information on the subtitle format used on CVD's
 272   except the submux sample code and a couple of samples of dubious
 273   origin. Thus, this is the result of reading some code whose
 274   correctness is not known and some experimentation.
 275
 276   CVD subtitles are different in several ways from SVCD OGT subtitles.
 277   Image comes first and metadata is at the end.  So that the metadata
 278   can be found easily, the subtitle packet starts with two bytes
 279   (everything is big-endian again) that give the total size of the
 280   subtitle data and the offset to the metadata - i.e. size of the
 281   image data plus the four bytes at the beginning.
 282
 283   Image data comes interlaced is run-length encoded.  Each field is a
 284   four-bit nibble. Each nibble contains a two-bit repeat count and a
 285   two-bit color number so that up to three pixels can be described in
 286   four bits.  The function of a 0 repeat count is unknown; it might be
 287   used for RLE extension.  However when the full nibble is zero, the
 288   rest of the line is filled with the color value in the next nibble.
 289   It is unknown what happens if the color value is greater than three.
 290   The rest seems to use a 4-entries palette.  It is not impossible
 291   that the fill-line complete case above is not as described and the
 292   zero repeat count means fill line.  The sample code never produces
 293   this, so it may be untested.
 294 */
 295
 296 static void ParseHeader( decoder_t *p_dec, block_t *p_block )
 297 {
 298     decoder_sys_t *p_sys = p_dec->p_sys;
 299     uint8_t *p = p_block->p_buffer;
 300
 301     p_sys->i_spu_size = (p[0] << 8) + p[1] + 4; p += 2;
 302
 303     /* FIXME: check data sanity */
 304     p_sys->metadata_offset = (p[0] <<  8) +   p[1]; p +=2;
 305     p_sys->metadata_length = p_sys->i_spu_size - p_sys->metadata_offset;
 306
 307     p_sys->i_image_offset = 4;
 308     p_sys->i_image_length = p_sys->metadata_offset - p_sys->i_image_offset;
 309
 310 #ifdef DEBUG_CVDSUB
 311     msg_Dbg( p_dec, "total size: %d  image size: %d",
 312              p_sys->i_spu_size, p_sys->i_image_length );
 313 #endif
 314
 315 }
 316
 317 /*
 318   We parse the metadata information here.
 319
 320   Although metadata information does not have to come in a fixed field
 321   order, every metadata field consists of a tag byte followed by
 322   parameters. In all cases known, the size including tag byte is
 323   exactly four bytes in length.
 324 */
 325
 326 #define ExtractXY(x, y) x = ((p[1]&0x0f)<<6) + (p[2]>>2); \
 327                         y = ((p[2]&0x03)<<8) + p[3];
 328
 329 static void ParseMetaInfo( decoder_t *p_dec, block_t *p_spu  )
 330 {
 331     /* Last packet in subtitle block. */
 332
 333     decoder_sys_t *p_sys = p_dec->p_sys;
 334     uint8_t       *p     = p_spu->p_buffer + p_sys->metadata_offset;
 335     uint8_t       *p_end = p + p_sys->metadata_length;
 336
 337     for( ; p < p_end; p += 4 )
 338     {
 339         switch( p[0] )
 340         {
 341         case 0x04: /* subtitle duration in 1/90000ths of a second */
 342             p_sys->i_duration = (p[1]<<16) + (p[2]<<8) + p[3];
 343
 344 #ifdef DEBUG_CVDSUB
 345             msg_Dbg( p_dec, "subtitle display duration %lu secs",
 346                      (long unsigned int)(p_sys->i_duration / 90000) );
 347 #endif
 348             p_sys->i_duration *= 100 / 9;
 349             break;
 350
 351         case 0x0c: /* unknown */
 352 #ifdef DEBUG_CVDSUB
 353             msg_Dbg( p_dec, "subtitle command unknown 0x%0x 0x%0x 0x%0x 0x%0x",
 354                      (int)p[0], (int)p[1], (int)p[2], (int)p[3] );
 355 #endif
 356             break;
 357
 358         case 0x17: /* coordinates of subtitle upper left x, y position */
 359             ExtractXY(p_sys->i_x_start, p_sys->i_y_start);
 360
 361 #ifdef DEBUG_CVDSUB
 362             msg_Dbg( p_dec, "start position (%d,%d)",
 363                      p_sys->i_x_start, p_sys->i_y_start );
 364 #endif
 365             break;
 366
 367         case 0x1f: /* coordinates of subtitle bottom right x, y position */
 368         {
 369             int lastx;
 370             int lasty;
 371             ExtractXY(lastx, lasty);
 372             p_sys->i_width  = lastx - p_sys->i_x_start + 1;
 373             p_sys->i_height = lasty - p_sys->i_y_start + 1;
 374
 375 #ifdef DEBUG_CVDSUB
 376             msg_Dbg( p_dec, "end position (%d,%d), w x h: %dx%d",
 377                      lastx, lasty, p_sys->i_width, p_sys->i_height );
 378 #endif
 379             break;
 380         }
 381
 382         case 0x24:
 383         case 0x25:
 384         case 0x26:
 385         case 0x27:
 386         {
 387             uint8_t v = p[0] - 0x24;
 388
 389 #ifdef DEBUG_CVDSUB
 390             /* Primary Palette */
 391             msg_Dbg( p_dec, "primary palette %d (y,u,v): (0x%0x,0x%0x,0x%0x)",
 392                      (int)v, (int)p[1], (int)p[2], (int)p[3] );
 393 #endif
 394
 395             p_sys->p_palette[v][0] = p[1]; /* Y */
 396             p_sys->p_palette[v][1] = p[3]; /* Cr / V */
 397             p_sys->p_palette[v][2] = p[2]; /* Cb / U */
 398             break;
 399         }
 400
 401         case 0x2c:
 402         case 0x2d:
 403         case 0x2e:
 404         case 0x2f:
 405         {
 406             uint8_t v = p[0] - 0x2c;
 407
 408 #ifdef DEBUG_CVDSUB
 409             msg_Dbg( p_dec,"highlight palette %d (y,u,v): (0x%0x,0x%0x,0x%0x)",
 410                      (int)v, (int)p[1], (int)p[2], (int)p[3] );
 411 #endif
 412
 413             /* Highlight Palette */
 414             p_sys->p_palette_highlight[v][0] = p[1]; /* Y */
 415             p_sys->p_palette_highlight[v][1] = p[3]; /* Cr / V */
 416             p_sys->p_palette_highlight[v][2] = p[2]; /* Cb / U */
 417             break;
 418         }
 419
 420         case 0x37:
 421             /* transparency for primary palette */
 422             p_sys->p_palette[0][3] = (p[3] & 0x0f) << 4;
 423             p_sys->p_palette[1][3] = (p[3] >> 4) << 4;
 424             p_sys->p_palette[2][3] = (p[2] & 0x0f) << 4;
 425             p_sys->p_palette[3][3] = (p[2] >> 4) << 4;
 426
 427 #ifdef DEBUG_CVDSUB
 428             msg_Dbg( p_dec, "transparency for primary palette 0..3: "
 429                      "0x%0x 0x%0x 0x%0x 0x%0x",
 430                      (int)p_sys->p_palette[0][3], (int)p_sys->p_palette[1][3],
 431                      (int)p_sys->p_palette[2][3], (int)p_sys->p_palette[3][3]);
 432 #endif
 433             break;
 434
 435         case 0x3f:
 436             /* transparency for highlight palette */
 437             p_sys->p_palette_highlight[0][3] = (p[2] & 0x0f) << 4;
 438             p_sys->p_palette_highlight[1][3] = (p[2] >> 4) << 4;
 439             p_sys->p_palette_highlight[2][3] = (p[1] & 0x0f) << 4;
 440             p_sys->p_palette_highlight[3][3] = (p[1] >> 4) << 4;
 441
 442 #ifdef DEBUG_CVDSUB
 443             msg_Dbg( p_dec, "transparency for highlight palette 0..3: "
 444                      "0x%0x 0x%0x 0x%0x 0x%0x",
 445                      (int)p_sys->p_palette_highlight[0][3],
 446                      (int)p_sys->p_palette_highlight[1][3],
 447                      (int)p_sys->p_palette_highlight[2][3],
 448                      (int)p_sys->p_palette_highlight[3][3] );
 449 #endif
 450             break;
 451
 452         case 0x47:
 453             /* offset to start of even rows of interlaced image, we correct
 454              * to make it relative to i_image_offset (usually 4) */
 455             p_sys->first_field_offset =
 456                 (p[2] << 8) + p[3] - p_sys->i_image_offset;
 457 #ifdef DEBUG_CVDSUB
 458             msg_Dbg( p_dec, "1st_field_offset %d", p_sys->first_field_offset );
 459 #endif
 460             break;
 461
 462         case 0x4f:
 463             /* offset to start of odd rows of interlaced image, we correct
 464              * to make it relative to i_image_offset (usually 4) */
 465             p_sys->second_field_offset =
 466                 (p[2] << 8) + p[3] - p_sys->i_image_offset;
 467 #ifdef DEBUG_CVDSUB
 468             msg_Dbg( p_dec, "2nd_field_offset %d", p_sys->second_field_offset);
 469 #endif
 470             break;
 471
 472         default:
 473 #ifdef DEBUG_CVDSUB
 474             msg_Warn( p_dec, "unknown sequence in control header "
 475                       "0x%0x 0x%0x 0x%0x 0x%0x", p[0], p[1], p[2], p[3]);
 476 #endif
 477         }
 478     }
 479 }
 480
 481 /*****************************************************************************
 482  * DecodePacket: parse and decode an SPU packet
 483  *****************************************************************************
 484  * This function parses and decodes an SPU packet and, if valid, returns a
 485  * subpicture.
 486  *****************************************************************************/
 487 static subpicture_t *DecodePacket( decoder_t *p_dec, block_t *p_data )
 488 {
 489     decoder_sys_t *p_sys = p_dec->p_sys;
 490     subpicture_t  *p_spu;
 491     subpicture_region_t *p_region;
 492     video_format_t fmt;
 493     int i;
 494
 495     /* Allocate the subpicture internal data. */
 496     p_spu = p_dec->pf_spu_buffer_new( p_dec );
 497     if( !p_spu ) return NULL;
 498
 499     p_spu->b_pausable = VLC_TRUE;
 500
 501     p_spu->i_x = p_sys->i_x_start;
 502     p_spu->i_x = p_spu->i_x * 3 / 4; /* FIXME: use aspect ratio for x? */
 503     p_spu->i_y = p_sys->i_y_start;
 504     p_spu->i_start = p_data->i_pts;
 505     p_spu->i_stop  = p_data->i_pts + p_sys->i_duration;
 506     p_spu->b_ephemer = VLC_TRUE;
 507
 508     /* Create new SPU region */
 509     memset( &fmt, 0, sizeof(video_format_t) );
 510     fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
 511     fmt.i_aspect = VOUT_ASPECT_FACTOR;
 512     fmt.i_width = fmt.i_visible_width = p_sys->i_width;
 513     fmt.i_height = fmt.i_visible_height = p_sys->i_height;
 514     fmt.i_x_offset = fmt.i_y_offset = 0;
 515     p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
 516     if( !p_region )
 517     {
 518         msg_Err( p_dec, "cannot allocate SPU region" );
 519         //goto error;
 520     }
 521
 522     p_spu->p_region = p_region;
 523     p_region->i_x = p_region->i_y = 0;
 524
 525     /* Build palette */
 526     fmt.p_palette->i_entries = 4;
 527     for( i = 0; i < fmt.p_palette->i_entries; i++ )
 528     {
 529         fmt.p_palette->palette[i][0] = p_sys->p_palette[i][0];
 530         fmt.p_palette->palette[i][1] = p_sys->p_palette[i][1];
 531         fmt.p_palette->palette[i][2] = p_sys->p_palette[i][2];
 532         fmt.p_palette->palette[i][3] = p_sys->p_palette[i][3];
 533     }
 534
 535     RenderImage( p_dec, p_data, p_region );
 536
 537     return p_spu;
 538 }
 539
 540 /*****************************************************************************
 541  * ParseImage: parse and render the image part of the subtitle
 542  *****************************************************************************
 543  This part parses the subtitle graphical data and renders it.
 544
 545  Image data comes interlaced and is run-length encoded (RLE). Each
 546  field is a four-bit nibbles that is further subdivided in a two-bit
 547  repeat count and a two-bit color number - up to three pixels can be
 548  described in four bits.  What a 0 repeat count means is unknown.  It
 549  might be used for RLE extension.  There is a special case of a 0
 550  repeat count though.  When the full nibble is zero, the rest of the
 551  line is filled with the color value in the next nibble.  It is
 552  unknown what happens if the color value is greater than three.  The
 553  rest seems to use a 4-entries palette.  It is not impossible that the
 554  fill-line complete case above is not as described and the zero repeat
 555  count means fill line.  The sample code never produces this, so it
 556  may be untested.
 557
 558  However we'll transform this so that that the RLE is expanded and
 559  interlacing will also be removed. On output each pixel entry will by
 560  a 4-bit alpha (filling 8 bits), and 8-bit y, u, and v entry.
 561
 562  *****************************************************************************/
 563 static void RenderImage( decoder_t *p_dec, block_t *p_data,
 564                          subpicture_region_t *p_region )
 565 {
 566     decoder_sys_t *p_sys = p_dec->p_sys;
 567     uint8_t *p_dest = p_region->picture.Y_PIXELS;
 568     int i_field;            /* The subtitles are interlaced */
 569     int i_row, i_column;    /* scanline row/column number */
 570     uint8_t i_color, i_count;
 571     bs_t bs;
 572
 573     bs_init( &bs, p_data->p_buffer + p_sys->i_image_offset,
 574              p_data->i_buffer - p_sys->i_image_offset );
 575
 576     for( i_field = 0; i_field < 2; i_field++ )
 577     {
 578         for( i_row = i_field; i_row < p_sys->i_height; i_row += 2 )
 579         {
 580             for( i_column = 0; i_column < p_sys->i_width; i_column++ )
 581             {
 582                 uint8_t i_val = bs_read( &bs, 4 );
 583
 584                 if( i_val == 0 )
 585                 {
 586                     /* Fill the rest of the line with next color */
 587                     i_color = bs_read( &bs, 4 );
 588
 589                     memset( &p_dest[i_row * p_region->picture.Y_PITCH +
 590                                     i_column], i_color,
 591                             p_sys->i_width - i_column );
 592                     i_column = p_sys->i_width;
 593                     continue;
 594                 }
 595                 else
 596                 {
 597                     /* Normal case: get color and repeat count */
 598                     i_count = (i_val >> 2);
 599                     i_color = i_val & 0x3;
 600
 601                     i_count = __MIN( i_count, p_sys->i_width - i_column );
 602
 603                     memset( &p_dest[i_row * p_region->picture.Y_PITCH +
 604                                     i_column], i_color, i_count );
 605                     i_column += i_count - 1;
 606                     continue;
 607                 }
 608             }
 609
 610             bs_align( &bs );
 611         }
 612     }
 613 }