modules/codec/cc.c

   1 /*****************************************************************************
   2  * cc608.c : CC 608/708 subtitles decoder
   3  *****************************************************************************
   4  * Copyright (C) 2007 Laurent Aimar
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar < fenrir # via.ecp.fr>
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 /* The EIA 608 decoder part has been initialy based on ccextractor (GPL)
  28  * and rewritten */
  29
  30 /* TODO:
  31  *  On discontinuity reset the decoder state
  32  *  Check parity
  33  *  708 decoding
  34  */
  35
  36 #ifdef HAVE_CONFIG_H
  37 # include "config.h"
  38 #endif
  39 #include <string.h>
  40 #include <assert.h>
  41
  42 #include <vlc_common.h>
  43 #include <vlc_plugin.h>
  44 #include <vlc_codec.h>
  45 #include <vlc_charset.h>
  46
  47 #include "substext.h"
  48
  49 /*****************************************************************************
  50  * Module descriptor.
  51  *****************************************************************************/
  52 static int  Open ( vlc_object_t * );
  53 static void Close( vlc_object_t * );
  54
  55 vlc_module_begin ()
  56     set_shortname( N_("CC 608/708"))
  57     set_description( N_("Closed Captions decoder") )
  58     set_capability( "decoder", 50 )
  59     set_callbacks( Open, Close )
  60 vlc_module_end ()
  61
  62 /*****************************************************************************
  63  * Local prototypes
  64  *****************************************************************************/
  65 typedef enum
  66 {
  67     EIA608_MODE_POPUP = 0,
  68     EIA608_MODE_ROLLUP_2 = 1,
  69     EIA608_MODE_ROLLUP_3 = 2,
  70     EIA608_MODE_ROLLUP_4 = 3,
  71     EIA608_MODE_PAINTON = 4,
  72     EIA608_MODE_TEXT = 5
  73 } eia608_mode_t;
  74
  75 typedef enum
  76 {
  77     EIA608_COLOR_WHITE = 0,
  78     EIA608_COLOR_GREEN = 1,
  79     EIA608_COLOR_BLUE = 2,
  80     EIA608_COLOR_CYAN = 3,
  81     EIA608_COLOR_RED = 4,
  82     EIA608_COLOR_YELLOW = 5,
  83     EIA608_COLOR_MAGENTA = 6,
  84     EIA608_COLOR_USERDEFINED = 7
  85 } eia608_color_t;
  86
  87 typedef enum
  88 {
  89     EIA608_FONT_REGULAR    = 0x00,
  90     EIA608_FONT_ITALICS    = 0x01,
  91     EIA608_FONT_UNDERLINE  = 0x02,
  92     EIA608_FONT_UNDERLINE_ITALICS = EIA608_FONT_UNDERLINE | EIA608_FONT_ITALICS
  93 } eia608_font_t;
  94
  95 #define EIA608_SCREEN_ROWS 15
  96 #define EIA608_SCREEN_COLUMNS 32
  97
  98 struct eia608_screen // A CC buffer
  99 {
 100     uint8_t characters[EIA608_SCREEN_ROWS][EIA608_SCREEN_COLUMNS+1];
 101     eia608_color_t colors[EIA608_SCREEN_ROWS][EIA608_SCREEN_COLUMNS+1];
 102     eia608_font_t fonts[EIA608_SCREEN_ROWS][EIA608_SCREEN_COLUMNS+1]; // Extra char at the end for a 0
 103     int row_used[EIA608_SCREEN_ROWS]; // Any data in row?
 104 };
 105 typedef struct eia608_screen eia608_screen;
 106
 107 typedef struct
 108 {
 109     /* Current channel (used to reject packet without channel information) */
 110     int i_channel;
 111
 112     /* */
 113     int           i_screen; /* Displayed screen */
 114     eia608_screen screen[2];
 115
 116     struct
 117     {
 118         int i_row;
 119         int i_column;
 120     } cursor;
 121
 122     /* */
 123     eia608_mode_t mode;
 124     eia608_color_t color;
 125     eia608_font_t font;
 126     int i_row_rollup;
 127
 128     /* Last command pair (used to reject duplicated command) */
 129     struct
 130     {
 131         uint8_t d1;
 132         uint8_t d2;
 133     } last;
 134 } eia608_t;
 135
 136 static void         Eia608Init( eia608_t * );
 137 static bool   Eia608Parse( eia608_t *h, int i_channel_selected, const uint8_t data[2] );
 138 static char        *Eia608Text( eia608_t *h, bool b_html );
 139 static void         Eia608Exit( eia608_t * );
 140
 141 /* It will be enough up to 63 B frames, which is far too high for
 142  * broadcast environment */
 143 #define CC_MAX_REORDER_SIZE (64)
 144 struct decoder_sys_t
 145 {
 146     int i;
 147
 148     int     i_block;
 149     block_t *pp_block[CC_MAX_REORDER_SIZE];
 150
 151     int i_field;
 152     int i_channel;
 153
 154     eia608_t eia608;
 155 };
 156
 157 static subpicture_t *Decode( decoder_t *, block_t ** );
 158
 159 /*****************************************************************************
 160  * Open: probe the decoder and return score
 161  *****************************************************************************
 162  * Tries to launch a decoder and return score so that the interface is able
 163  * to chose.
 164  *****************************************************************************/
 165 static int Open( vlc_object_t *p_this )
 166 {
 167     decoder_t     *p_dec = (decoder_t*)p_this;
 168     decoder_sys_t *p_sys;
 169     int i_field;
 170     int i_channel;
 171
 172     switch( p_dec->fmt_in.i_codec )
 173     {
 174         case VLC_FOURCC('c','c','1',' '):
 175             i_field = 0; i_channel = 1;
 176             break;
 177         case VLC_FOURCC('c','c','2',' '):
 178             i_field = 0; i_channel = 2;
 179             break;
 180         case VLC_FOURCC('c','c','3',' '):
 181             i_field = 1; i_channel = 1;
 182             break;
 183         case VLC_FOURCC('c','c','4',' '):
 184             i_field = 1; i_channel = 2;
 185             break;
 186
 187         default:
 188             return VLC_EGENERIC;
 189     }
 190
 191     p_dec->pf_decode_sub = Decode;
 192
 193     /* Allocate the memory needed to store the decoder's structure */
 194     p_dec->p_sys = p_sys = calloc( 1, sizeof( *p_sys ) );
 195     if( p_sys == NULL )
 196         return VLC_ENOMEM;
 197
 198     /* init of p_sys */
 199     p_sys->i_field = i_field;
 200     p_sys->i_channel = i_channel;
 201
 202     Eia608Init( &p_sys->eia608 );
 203
 204     p_dec->fmt_out.i_cat = SPU_ES;
 205     p_dec->fmt_out.i_codec = VLC_CODEC_TEXT;
 206
 207     return VLC_SUCCESS;
 208 }
 209
 210 /****************************************************************************
 211  * Decode: the whole thing
 212  ****************************************************************************
 213  *
 214  ****************************************************************************/
 215 static void     Push( decoder_t *, block_t * );
 216 static block_t *Pop( decoder_t * );
 217 static subpicture_t *Convert( decoder_t *, block_t * );
 218
 219 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
 220 {
 221     if( pp_block && *pp_block )
 222     {
 223         Push( p_dec, *pp_block );
 224         *pp_block = NULL;
 225     }
 226
 227     for( ;; )
 228     {
 229         block_t *p_block = Pop( p_dec );
 230         if( !p_block )
 231             break;
 232
 233         subpicture_t *p_spu = Convert( p_dec, p_block );
 234         if( p_spu )
 235             return p_spu;
 236     }
 237     return NULL;
 238 }
 239
 240 /*****************************************************************************
 241  * CloseDecoder: clean up the decoder
 242  *****************************************************************************/
 243 static void Close( vlc_object_t *p_this )
 244 {
 245     decoder_t *p_dec = (decoder_t *)p_this;
 246     decoder_sys_t *p_sys = p_dec->p_sys;
 247     int i;
 248
 249     for( i = 0; i < p_sys->i_block; i++ )
 250         block_Release( p_sys->pp_block[i] );
 251     Eia608Exit( &p_sys->eia608 );
 252     free( p_sys );
 253 }
 254
 255 /*****************************************************************************
 256  *
 257  *****************************************************************************/
 258 static void Push( decoder_t *p_dec, block_t *p_block )
 259 {
 260     decoder_sys_t *p_sys = p_dec->p_sys;
 261
 262     if( p_sys->i_block >= CC_MAX_REORDER_SIZE )
 263     {
 264         msg_Warn( p_dec, "Trashing a CC entry" );
 265         memmove( &p_sys->pp_block[0], &p_sys->pp_block[1], sizeof(*p_sys->pp_block) * (CC_MAX_REORDER_SIZE-1) );
 266         p_sys->i_block--;
 267     }
 268     p_sys->pp_block[p_sys->i_block++] = p_block;
 269 }
 270 static block_t *Pop( decoder_t *p_dec )
 271 {
 272     decoder_sys_t *p_sys = p_dec->p_sys;
 273     block_t *p_block;
 274     int i_index;
 275     int i;
 276     /* XXX Cc captions data are OUT OF ORDER (because we receive them in the bitstream
 277      * order (ie ordered by video picture dts) instead of the display order.
 278      *  We will simulate a simple IPB buffer scheme
 279      * and reorder with pts.
 280      * XXX it won't work with H264 which use non out of order B picture or MMCO
 281      */
 282
 283     /* Wait for a P and output all *previous* picture by pts order (for
 284      * hierarchical B frames) */
 285     if( p_sys->i_block <= 1 ||
 286         ( p_sys->pp_block[p_sys->i_block-1]->i_flags & BLOCK_FLAG_TYPE_B ) )
 287         return NULL;
 288
 289     p_block = p_sys->pp_block[i_index = 0];
 290     if( p_block->i_pts > VLC_TS_INVALID )
 291     {
 292         for( i = 1; i < p_sys->i_block-1; i++ )
 293         {
 294             if( p_sys->pp_block[i]->i_pts > VLC_TS_INVALID && p_block->i_pts > VLC_TS_INVALID &&
 295                 p_sys->pp_block[i]->i_pts < p_block->i_pts )
 296                 p_block = p_sys->pp_block[i_index = i];
 297         }
 298     }
 299     assert( i_index+1 < p_sys->i_block );
 300     memmove( &p_sys->pp_block[i_index], &p_sys->pp_block[i_index+1], sizeof(*p_sys->pp_block) * ( p_sys->i_block - i_index - 1 ) );
 301     p_sys->i_block--;
 302
 303     return p_block;
 304 }
 305
 306 static subpicture_t *Subtitle( decoder_t *p_dec, char *psz_subtitle, char *psz_html, mtime_t i_pts )
 307 {
 308     //decoder_sys_t *p_sys = p_dec->p_sys;
 309     subpicture_t *p_spu = NULL;
 310
 311     /* We cannot display a subpicture with no date */
 312     if( i_pts <= VLC_TS_INVALID )
 313     {
 314         msg_Warn( p_dec, "subtitle without a date" );
 315         return NULL;
 316     }
 317
 318     EnsureUTF8( psz_subtitle );
 319     if( psz_html )
 320         EnsureUTF8( psz_html );
 321
 322     /* Create the subpicture unit */
 323     p_spu = decoder_NewSubpictureText( p_dec );
 324     if( !p_spu )
 325     {
 326         free( psz_subtitle );
 327         free( psz_html );
 328         return NULL;
 329     }
 330     p_spu->i_start    = i_pts;
 331     p_spu->i_stop     = i_pts + 10000000;   /* 10s max */
 332     p_spu->b_ephemer  = true;
 333     p_spu->b_absolute = false;
 334
 335     subpicture_updater_sys_t *p_spu_sys = p_spu->updater.p_sys;
 336
 337     p_spu_sys->align = SUBPICTURE_ALIGN_BOTTOM;
 338     p_spu_sys->text  = psz_subtitle;
 339     p_spu_sys->html  = psz_html;
 340
 341     return p_spu;
 342 }
 343
 344 static subpicture_t *Convert( decoder_t *p_dec, block_t *p_block )
 345 {
 346     assert( p_block );
 347
 348     decoder_sys_t *p_sys = p_dec->p_sys;
 349     const int64_t i_pts = p_block->i_pts;
 350     bool b_changed = false;
 351
 352     /* TODO do the real decoding here */
 353     while( p_block->i_buffer >= 3 )
 354     {
 355         if( p_block->p_buffer[0] == p_sys->i_field )
 356             b_changed |= Eia608Parse( &p_sys->eia608, p_sys->i_channel, &p_block->p_buffer[1] );
 357
 358         p_block->i_buffer -= 3;
 359         p_block->p_buffer += 3;
 360     }
 361     if( p_block )
 362         block_Release( p_block );
 363
 364     if( b_changed )
 365     {
 366         char *psz_subtitle = Eia608Text( &p_sys->eia608, false );
 367         char *psz_html     = NULL;//Eia608Text( &p_sys->eia608, true );
 368         return Subtitle( p_dec, psz_subtitle, psz_html, i_pts );
 369     }
 370     return NULL;
 371 }
 372
 373
 374 /*****************************************************************************
 375  *
 376  *****************************************************************************/
 377 static const struct {
 378     eia608_color_t  i_color;
 379     eia608_font_t   i_font;
 380     int             i_column;
 381 } pac2_attribs[]= {
 382     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,           0 },
 383     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,         0 },
 384     { EIA608_COLOR_GREEN,   EIA608_FONT_REGULAR,           0 },
 385     { EIA608_COLOR_GREEN,   EIA608_FONT_UNDERLINE,         0 },
 386     { EIA608_COLOR_BLUE,    EIA608_FONT_REGULAR,           0 },
 387     { EIA608_COLOR_BLUE,    EIA608_FONT_UNDERLINE,         0 },
 388     { EIA608_COLOR_CYAN,    EIA608_FONT_REGULAR,           0 },
 389     { EIA608_COLOR_CYAN,    EIA608_FONT_UNDERLINE,         0 },
 390     { EIA608_COLOR_RED,     EIA608_FONT_REGULAR,           0 },
 391     { EIA608_COLOR_RED,     EIA608_FONT_UNDERLINE,         0 },
 392     { EIA608_COLOR_YELLOW,  EIA608_FONT_REGULAR,           0 },
 393     { EIA608_COLOR_YELLOW,  EIA608_FONT_UNDERLINE,         0 },
 394     { EIA608_COLOR_MAGENTA, EIA608_FONT_REGULAR,           0 },
 395     { EIA608_COLOR_MAGENTA, EIA608_FONT_UNDERLINE,         0 },
 396     { EIA608_COLOR_WHITE,   EIA608_FONT_ITALICS,           0 },
 397     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE_ITALICS, 0 },
 398
 399     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,           0 },
 400     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,         0 },
 401     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,           4 },
 402     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,         4 },
 403     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,           8 },
 404     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,         8 },
 405     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,          12 },
 406     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,        12 },
 407     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,          16 },
 408     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,        16 },
 409     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,          20 },
 410     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,        20 },
 411     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,          24 },
 412     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,        24 },
 413     { EIA608_COLOR_WHITE,   EIA608_FONT_REGULAR,          28 },
 414     { EIA608_COLOR_WHITE,   EIA608_FONT_UNDERLINE,        28 } ,
 415 };
 416
 417 #define EIA608_COLOR_DEFAULT EIA608_COLOR_WHITE
 418
 419 static void Eia608Cursor( eia608_t *h, int dx )
 420 {
 421     h->cursor.i_column += dx;
 422     if( h->cursor.i_column < 0 )
 423         h->cursor.i_column = 0;
 424     else if( h->cursor.i_column > EIA608_SCREEN_COLUMNS-1 )
 425         h->cursor.i_column = EIA608_SCREEN_COLUMNS-1;
 426 }
 427 static void Eia608ClearScreenRowX( eia608_t *h, int i_screen, int i_row, int x )
 428 {
 429     eia608_screen *screen = &h->screen[i_screen];
 430     int i;
 431
 432     if( x == 0 )
 433     {
 434         screen->row_used[i_row] = false;
 435     }
 436     else
 437     {
 438         screen->row_used[i_row] = false;
 439         for( i = 0; i < x; i++ )
 440         {
 441             if( screen->characters[i_row][i] != ' ' ||
 442                 screen->colors[i_row][i] != EIA608_COLOR_DEFAULT ||
 443                 screen->fonts[i_row][i] != EIA608_FONT_REGULAR )
 444             {
 445                 screen->row_used[i_row] = true;
 446                 break;
 447             }
 448         }
 449     }
 450
 451     for( ; x < EIA608_SCREEN_COLUMNS+1; x++ )
 452     {
 453         screen->characters[i_row][x] = x < EIA608_SCREEN_COLUMNS ? ' ' : '\0';
 454         screen->colors[i_row][x] = EIA608_COLOR_DEFAULT;
 455         screen->fonts[i_row][x] = EIA608_FONT_REGULAR;
 456     }
 457 }
 458
 459 static void Eia608ClearScreenRow( eia608_t *h, int i_screen, int i_row )
 460 {
 461     Eia608ClearScreenRowX( h, i_screen, i_row, 0 );
 462 }
 463
 464 static void Eia608ClearScreen( eia608_t *h, int i_screen )
 465 {
 466     int i;
 467     for( i = 0; i < EIA608_SCREEN_ROWS; i++ )
 468         Eia608ClearScreenRow( h, i_screen, i );
 469 }
 470
 471 static int Eia608GetWritingScreenIndex( eia608_t *h )
 472 {
 473     switch( h->mode )
 474     {
 475     case EIA608_MODE_POPUP:    // Non displayed screen
 476         return 1 - h->i_screen;
 477
 478     case EIA608_MODE_ROLLUP_2: // Displayed screen
 479     case EIA608_MODE_ROLLUP_3:
 480     case EIA608_MODE_ROLLUP_4:
 481     case EIA608_MODE_PAINTON:
 482         return h->i_screen;
 483     default:
 484         /* It cannot happen, else it is a bug */
 485         assert( 0 );
 486         return 0;
 487     }
 488 }
 489
 490 static void Eia608EraseScreen( eia608_t *h, bool b_displayed )
 491 {
 492     Eia608ClearScreen( h, b_displayed ? h->i_screen : (1-h->i_screen) );
 493 }
 494
 495 static void Eia608Write( eia608_t *h, const uint8_t c )
 496 {
 497     const int i_row = h->cursor.i_row;
 498     const int i_column = h->cursor.i_column;
 499     eia608_screen *screen;
 500
 501     if( h->mode == EIA608_MODE_TEXT )
 502         return;
 503
 504     screen = &h->screen[Eia608GetWritingScreenIndex( h )];
 505
 506     screen->characters[i_row][i_column] = c;
 507     screen->colors[i_row][i_column] = h->color;
 508     screen->fonts[i_row][i_column] = h->font;
 509     screen->row_used[i_row] = true;
 510     Eia608Cursor( h, 1 );
 511 }
 512 static void Eia608Erase( eia608_t *h )
 513 {
 514     const int i_row = h->cursor.i_row;
 515     const int i_column = h->cursor.i_column - 1;
 516     eia608_screen *screen;
 517
 518     if( h->mode == EIA608_MODE_TEXT )
 519         return;
 520     if( i_column < 0 )
 521         return;
 522
 523     screen = &h->screen[Eia608GetWritingScreenIndex( h )];
 524
 525     /* FIXME do we need to reset row_used/colors/font ? */
 526     screen->characters[i_row][i_column] = ' ';
 527     Eia608Cursor( h, -1 );
 528 }
 529 static void Eia608EraseToEndOfRow( eia608_t *h )
 530 {
 531     if( h->mode == EIA608_MODE_TEXT )
 532         return;
 533
 534     Eia608ClearScreenRowX( h, Eia608GetWritingScreenIndex( h ), h->cursor.i_row, h->cursor.i_column );
 535 }
 536
 537 static void Eia608RollUp( eia608_t *h )
 538 {
 539     if( h->mode == EIA608_MODE_TEXT )
 540         return;
 541
 542     const int i_screen = Eia608GetWritingScreenIndex( h );
 543     eia608_screen *screen = &h->screen[i_screen];
 544
 545     int keep_lines;
 546     int i;
 547
 548     /* Window size */
 549     if( h->mode == EIA608_MODE_ROLLUP_2 )
 550         keep_lines = 2;
 551     else if( h->mode == EIA608_MODE_ROLLUP_3 )
 552         keep_lines = 3;
 553     else if( h->mode == EIA608_MODE_ROLLUP_4 )
 554         keep_lines = 4;
 555     else
 556         return;
 557
 558     /* Reset the cursor */
 559     h->cursor.i_column = 0;
 560
 561     /* Erase lines above our window */
 562     for( i = 0; i < h->cursor.i_row - keep_lines; i++ )
 563         Eia608ClearScreenRow( h, i_screen, i );
 564
 565     /* Move up */
 566     for( i = 0; i < keep_lines-1; i++ )
 567     {
 568         const int i_row = h->cursor.i_row - keep_lines + i + 1;
 569         if( i_row < 0 )
 570             continue;
 571         assert( i_row+1 < EIA608_SCREEN_ROWS );
 572         memcpy( screen->characters[i_row], screen->characters[i_row+1], sizeof(*screen->characters) );
 573         memcpy( screen->colors[i_row], screen->colors[i_row+1], sizeof(*screen->colors) );
 574         memcpy( screen->fonts[i_row], screen->fonts[i_row+1], sizeof(*screen->fonts) );
 575         screen->row_used[i_row] = screen->row_used[i_row+1];
 576     }
 577     /* Reset current row */
 578     Eia608ClearScreenRow( h, i_screen, h->cursor.i_row );
 579 }
 580 static void Eia608ParseChannel( eia608_t *h, const uint8_t d[2] )
 581 {
 582     /* Check odd parity */
 583     static const int p4[16] = {
 584         0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0
 585     };
 586     if( p4[d[0] & 0xf] == p4[d[0] >> 4] ||
 587         p4[d[1] & 0xf] == p4[ d[1] >> 4] )
 588     {
 589         h->i_channel = -1;
 590         return;
 591     }
 592
 593     /* */
 594     const int d1 = d[0] & 0x7f;
 595     if( d1 >= 0x10 && d1 <= 0x1f )
 596         h->i_channel = 1 + ((d1 & 0x08) != 0);
 597     else if( d1 < 0x10 )
 598         h->i_channel = 3;
 599 }
 600 static bool Eia608ParseTextAttribute( eia608_t *h, uint8_t d2 )
 601 {
 602     const int i_index = d2 - 0x20;
 603     assert( d2 >= 0x20 && d2 <= 0x2f );
 604
 605     h->color = pac2_attribs[i_index].i_color;
 606     h->font  = pac2_attribs[i_index].i_font;
 607     Eia608Cursor( h, 1 );
 608
 609     return false;
 610 }
 611 static bool Eia608ParseSingle( eia608_t *h, const uint8_t dx )
 612 {
 613     assert( dx >= 0x20 );
 614     Eia608Write( h, dx );
 615     return true;
 616 }
 617 static bool Eia608ParseDouble( eia608_t *h, uint8_t d2 )
 618 {
 619     assert( d2 >= 0x30 && d2 <= 0x3f );
 620     Eia608Write( h, d2 + 0x50 ); /* We use charaters 0x80...0x8f */
 621     return true;
 622 }
 623 static bool Eia608ParseExtended( eia608_t *h, uint8_t d1, uint8_t d2 )
 624 {
 625     assert( d2 >= 0x20 && d2 <= 0x3f );
 626     assert( d1 == 0x12 || d1 == 0x13 );
 627     if( d1 == 0x12 )
 628         d2 += 0x70; /* We use charaters 0x90-0xaf */
 629     else
 630         d2 += 0x90; /* We use charaters 0xb0-0xcf */
 631
 632     /* The extended characters replace the previous one with a more
 633      * advanced one */
 634     Eia608Cursor( h, -1 );
 635     Eia608Write( h, d2 );
 636     return true;
 637 }
 638 static bool Eia608ParseCommand0x14( eia608_t *h, uint8_t d2 )
 639 {
 640     bool b_changed = false;
 641
 642     switch( d2 )
 643     {
 644     case 0x20:  /* Resume caption loading */
 645         h->mode = EIA608_MODE_POPUP;
 646         break;
 647     case 0x21:  /* Backspace */
 648         Eia608Erase( h );
 649         b_changed = true;
 650         break;
 651     case 0x22:  /* Reserved */
 652     case 0x23:
 653         break;
 654     case 0x24:  /* Delete to end of row */
 655         Eia608EraseToEndOfRow( h );
 656         break;
 657     case 0x25:  /* Rollup 2 */
 658     case 0x26:  /* Rollup 3 */
 659     case 0x27:  /* Rollup 4 */
 660         if( h->mode == EIA608_MODE_POPUP || h->mode == EIA608_MODE_PAINTON )
 661         {
 662             Eia608EraseScreen( h, true );
 663             Eia608EraseScreen( h, false );
 664             b_changed = true;
 665         }
 666
 667         if( d2 == 0x25 )
 668             h->mode = EIA608_MODE_ROLLUP_2;
 669         else if( d2 == 0x26 )
 670             h->mode = EIA608_MODE_ROLLUP_3;
 671         else
 672             h->mode = EIA608_MODE_ROLLUP_4;
 673
 674         h->cursor.i_column = 0;
 675         h->cursor.i_row = h->i_row_rollup;
 676         break;
 677     case 0x28:  /* Flash on */
 678         /* TODO */
 679         break;
 680     case 0x29:  /* Resume direct captionning */
 681         h->mode = EIA608_MODE_PAINTON;
 682         break;
 683     case 0x2a:  /* Text restart */
 684         /* TODO */
 685         break;
 686
 687     case 0x2b: /* Resume text display */
 688         h->mode = EIA608_MODE_TEXT;
 689         break;
 690
 691     case 0x2c: /* Erase displayed memory */
 692         Eia608EraseScreen( h, true );
 693         b_changed = true;
 694         break;
 695     case 0x2d: /* Carriage return */
 696         Eia608RollUp(h);
 697         b_changed = true;
 698         break;
 699     case 0x2e: /* Erase non displayed memory */
 700         Eia608EraseScreen( h, false );
 701         break;
 702     case 0x2f: /* End of caption (flip screen if not paint on) */
 703         if( h->mode != EIA608_MODE_PAINTON )
 704             h->i_screen = 1 - h->i_screen;
 705         h->mode = EIA608_MODE_POPUP;
 706         h->cursor.i_column = 0;
 707         h->cursor.i_row = 0;
 708         h->color = EIA608_COLOR_DEFAULT;
 709         h->font = EIA608_FONT_REGULAR;
 710         b_changed = true;
 711         break;
 712     }
 713     return b_changed;
 714 }
 715 static bool Eia608ParseCommand0x17( eia608_t *h, uint8_t d2 )
 716 {
 717     switch( d2 )
 718     {
 719     case 0x21:  /* Tab offset 1 */
 720         Eia608Cursor( h, 1 );
 721         break;
 722     case 0x22:  /* Tab offset 2 */
 723         Eia608Cursor( h, 2 );
 724         break;
 725     case 0x23:  /* Tab offset 3 */
 726         Eia608Cursor( h, 3 );
 727         break;
 728     }
 729     return false;
 730 }
 731 static bool Eia608ParsePac( eia608_t *h, uint8_t d1, uint8_t d2 )
 732 {
 733     static const int pi_row[] = {
 734         11, -1, 1, 2, 3, 4, 12, 13, 14, 15, 5, 6, 7, 8, 9, 10
 735     };
 736     const int i_row_index = ( (d1<<1) & 0x0e) | ( (d2>>5) & 0x01 );
 737
 738     assert( d2 >= 0x40 && d2 <= 0x7f );
 739
 740     if( pi_row[i_row_index] <= 0 )
 741         return false;
 742
 743     /* Row */
 744     if( h->mode != EIA608_MODE_TEXT )
 745         h->cursor.i_row = pi_row[i_row_index] - 1;
 746     h->i_row_rollup = pi_row[i_row_index] - 1;
 747     /* Column */
 748     if( d2 >= 0x60 )
 749         d2 -= 0x60;
 750     else if( d2 >= 0x40 )
 751         d2 -= 0x40;
 752     h->cursor.i_column = pac2_attribs[d2].i_column;
 753     h->color = pac2_attribs[d2].i_color;
 754     h->font  = pac2_attribs[d2].i_font;
 755
 756     return false;
 757 }
 758
 759 static bool Eia608ParseData( eia608_t *h, uint8_t d1, uint8_t d2 )
 760 {
 761     bool b_changed = false;
 762
 763     if( d1 >= 0x18 && d1 <= 0x1f )
 764         d1 -= 8;
 765
 766 #define ON( d2min, d2max, cmd ) do { if( d2 >= d2min && d2 <= d2max ) b_changed = cmd; } while(0)
 767     switch( d1 )
 768     {
 769     case 0x11:
 770         ON( 0x20, 0x2f, Eia608ParseTextAttribute( h, d2 ) );
 771         ON( 0x30, 0x3f, Eia608ParseDouble( h, d2 ) );
 772         break;
 773     case 0x12: case 0x13:
 774         ON( 0x20, 0x3f, Eia608ParseExtended( h, d1, d2 ) );
 775         break;
 776     case 0x14: case 0x15:
 777         ON( 0x20, 0x2f, Eia608ParseCommand0x14( h, d2 ) );
 778         break;
 779     case 0x17:
 780         ON( 0x21, 0x22, Eia608ParseCommand0x17( h, d2 ) );
 781         ON( 0x2e, 0x2f, Eia608ParseTextAttribute( h, d2 ) );
 782         break;
 783     }
 784     if( d1 == 0x10 )
 785         ON( 0x40, 0x5f, Eia608ParsePac( h, d1, d2 ) );
 786     else if( d1 >= 0x11 && d1 <= 0x17 )
 787         ON( 0x40, 0x7f, Eia608ParsePac( h, d1, d2 ) );
 788 #undef ON
 789     if( d1 >= 0x20 )
 790     {
 791         b_changed = Eia608ParseSingle( h, d1 );
 792         if( d2 >= 0x20 )
 793             b_changed |= Eia608ParseSingle( h, d2 );
 794     }
 795     return b_changed;
 796 }
 797
 798 static void Eia608TextUtf8( char *psz_utf8, uint8_t c ) // Returns number of bytes used
 799 {
 800 #define E1(c,u) { c, { u, '\0' } }
 801 #define E2(c,u1,u2) { c, { u1, u2, '\0' } }
 802 #define E3(c,u1,u2,u3) { c, { u1, u2, u3, '\0' } }
 803     static const struct {
 804         uint8_t c;
 805         char utf8[3+1];
 806     } c2utf8[] = {
 807         // Regular line-21 character set, mostly ASCII except these exceptions
 808         E2( 0x2a, 0xc3,0xa1), // lowercase a, acute accent
 809         E2( 0x5c, 0xc3,0xa9), // lowercase e, acute accent
 810         E2( 0x5e, 0xc3,0xad), // lowercase i, acute accent
 811         E2( 0x5f, 0xc3,0xb3), // lowercase o, acute accent
 812         E2( 0x60, 0xc3,0xba), // lowercase u, acute accent
 813         E2( 0x7b, 0xc3,0xa7), // lowercase c with cedilla
 814         E2( 0x7c, 0xc3,0xb7), // division symbol
 815         E2( 0x7d, 0xc3,0x91), // uppercase N tilde
 816         E2( 0x7e, 0xc3,0xb1), // lowercase n tilde
 817         // THIS BLOCK INCLUDES THE 16 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
 818         // THAT COME FROM HI BYTE=0x11 AND LOW BETWEEN 0x30 AND 0x3F
 819         E2( 0x80, 0xc2,0xae), // Registered symbol (R)
 820         E2( 0x81, 0xc2,0xb0), // degree sign
 821         E2( 0x82, 0xc2,0xbd), // 1/2 symbol
 822         E2( 0x83, 0xc2,0xbf), // Inverted (open) question mark
 823         E3( 0x84, 0xe2,0x84,0xa2), // Trademark symbol (TM)
 824         E2( 0x85, 0xc2,0xa2), // Cents symbol
 825         E2( 0x86, 0xc2,0xa3), // Pounds sterling
 826         E3( 0x87, 0xe2,0x99,0xaa), // Music note
 827         E2( 0x88, 0xc3,0xa0), // lowercase a, grave accent
 828         E2( 0x89, 0xc2,0xa0), // transparent space
 829         E2( 0x8a, 0xc3,0xa8), // lowercase e, grave accent
 830         E2( 0x8b, 0xc3,0xa2), // lowercase a, circumflex accent
 831         E2( 0x8c, 0xc3,0xaa), // lowercase e, circumflex accent
 832         E2( 0x8d, 0xc3,0xae), // lowercase i, circumflex accent
 833         E2( 0x8e, 0xc3,0xb4), // lowercase o, circumflex accent
 834         E2( 0x8f, 0xc3,0xbb), // lowercase u, circumflex accent
 835         // THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
 836         // THAT COME FROM HI BYTE=0x12 AND LOW BETWEEN 0x20 AND 0x3F
 837         E2( 0x90, 0xc3,0x81), // capital letter A with acute
 838         E2( 0x91, 0xc3,0x89), // capital letter E with acute
 839         E2( 0x92, 0xc3,0x93), // capital letter O with acute
 840         E2( 0x93, 0xc3,0x9a), // capital letter U with acute
 841         E2( 0x94, 0xc3,0x9c), // capital letter U with diaresis
 842         E2( 0x95, 0xc3,0xbc), // lowercase letter U with diaeresis
 843         E1( 0x96, 0x27), // apostrophe
 844         E2( 0x97, 0xc2,0xa1), // inverted exclamation mark
 845         E1( 0x98, 0x2a), // asterisk
 846         E1( 0x99, 0x27), // apostrophe (yes, duped). See CCADI source code.
 847         E1( 0x9a, 0x2d), // hyphen-minus
 848         E2( 0x9b, 0xc2,0xa9), // copyright sign
 849         E3( 0x9c, 0xe2,0x84,0xa0), // Service mark
 850         E1( 0x9d, 0x2e), // Full stop (.)
 851         E3( 0x9e, 0xe2,0x80,0x9c), // Quotation mark
 852         E3( 0x9f, 0xe2,0x80,0x9d), // Quotation mark
 853         E2( 0xa0, 0xc3,0x80), // uppercase A, grave accent
 854         E2( 0xa1, 0xc3,0x82), // uppercase A, circumflex
 855         E2( 0xa2, 0xc3,0x87), // uppercase C with cedilla
 856         E2( 0xa3, 0xc3,0x88), // uppercase E, grave accent
 857         E2( 0xa4, 0xc3,0x8a), // uppercase E, circumflex
 858         E2( 0xa5, 0xc3,0x8b), // capital letter E with diaresis
 859         E2( 0xa6, 0xc3,0xab), // lowercase letter e with diaresis
 860         E2( 0xa7, 0xc3,0x8e), // uppercase I, circumflex
 861         E2( 0xa8, 0xc3,0x8f), // uppercase I, with diaresis
 862         E2( 0xa9, 0xc3,0xaf), // lowercase i, with diaresis
 863         E2( 0xaa, 0xc3,0x94), // uppercase O, circumflex
 864         E2( 0xab, 0xc3,0x99), // uppercase U, grave accent
 865         E2( 0xac, 0xc3,0xb9), // lowercase u, grave accent
 866         E2( 0xad, 0xc3,0x9b), // uppercase U, circumflex
 867         E2( 0xae, 0xc2,0xab), // LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
 868         E2( 0xaf, 0xc2,0xbb), // RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
 869         // THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS
 870         // THAT COME FROM HI BYTE=0x13 AND LOW BETWEEN 0x20 AND 0x3F
 871         E2( 0xb0, 0xc3,0x83), // Uppercase A, tilde
 872         E2( 0xb1, 0xc3,0xa3), // Lowercase a, tilde
 873         E2( 0xb2, 0xc3,0x8d), // Uppercase I, acute accent
 874         E2( 0xb3, 0xc3,0x8c), // Uppercase I, grave accent
 875         E2( 0xb4, 0xc3,0xac), // Lowercase i, grave accent
 876         E2( 0xb5, 0xc3,0x92), // Uppercase O, grave accent
 877         E2( 0xb6, 0xc3,0xb2), // Lowercase o, grave accent
 878         E2( 0xb7, 0xc3,0x95), // Uppercase O, tilde
 879         E2( 0xb8, 0xc3,0xb5), // Lowercase o, tilde
 880         E1( 0xb9, 0x7b), // Open curly brace
 881         E1( 0xba, 0x7d), // Closing curly brace
 882         E1( 0xbb, 0x5c), // Backslash
 883         E1( 0xbc, 0x5e), // Caret
 884         E1( 0xbd, 0x5f), // Underscore
 885         E2( 0xbe, 0xc2,0xa6), // Pipe (broken bar)
 886         E1( 0xbf, 0x7e), // Tilde (utf8 code unsure)
 887         E2( 0xc0, 0xc3,0x84), // Uppercase A, umlaut
 888         E2( 0xc1, 0xc3,0xa4), // Lowercase A, umlaut
 889         E2( 0xc2, 0xc3,0x96), // Uppercase O, umlaut
 890         E2( 0xc3, 0xc3,0xb6), // Lowercase o, umlaut
 891         E2( 0xc4, 0xc3,0x9f), // Esszett (sharp S)
 892         E2( 0xc5, 0xc2,0xa5), // Yen symbol
 893         E2( 0xc6, 0xc2,0xa4), // Currency symbol
 894         E1( 0xc7, 0x7c), // Vertical bar
 895         E2( 0xc8, 0xc3,0x85), // Uppercase A, ring
 896         E2( 0xc9, 0xc3,0xa5), // Lowercase A, ring
 897         E2( 0xca, 0xc3,0x98), // Uppercase O, slash
 898         E2( 0xcb, 0xc3,0xb8), // Lowercase o, slash
 899         E3( 0xcc, 0xe2,0x8c,0x9c), // Upper left corner
 900         E3( 0xcd, 0xe2,0x8c,0x9d), // Upper right corner
 901         E3( 0xce, 0xe2,0x8c,0x9e), // Lower left corner
 902         E3( 0xcf, 0xe2,0x8c,0x9f), // Lower right corner
 903
 904         E1(0,0)
 905     };
 906 #undef E3
 907 #undef E2
 908 #undef E1
 909
 910     static const int i_c2utf8 = sizeof(c2utf8)/sizeof(*c2utf8);
 911     int i;
 912
 913     for( i = 0; i < i_c2utf8; i++ )
 914     {
 915         if( c2utf8[i].c == c )
 916             break;
 917     }
 918     if( i >= i_c2utf8 )
 919     {
 920         psz_utf8[0] = c < 0x80 ? c : '?';   /* Normal : Unsupported */
 921         psz_utf8[1] = '\0';
 922     }
 923     else
 924     {
 925         strcpy( psz_utf8, c2utf8[i].utf8 );
 926     }
 927 }
 928
 929 static void Eia608Strlcat( char *d, const char *s, int i_max )
 930 {
 931     if( i_max > 1 )
 932         strncat( d, s, i_max-1 - strnlen(d, i_max-1));
 933     if( i_max > 0 )
 934         d[i_max-1] = '\0';
 935 }
 936
 937 static void Eia608TextLine( struct eia608_screen *screen, char *psz_text, int i_text_max, int i_row, bool b_html )
 938 {
 939     const uint8_t *p_char = screen->characters[i_row];
 940     const eia608_color_t *p_color = screen->colors[i_row];
 941     const eia608_font_t *p_font = screen->fonts[i_row];
 942     int i_start;
 943     int i_end;
 944     int x;
 945     eia608_color_t last_color = EIA608_COLOR_DEFAULT;
 946     bool     b_last_italics = false;
 947     bool     b_last_underline = false;
 948
 949     /* Search the start */
 950     i_start = 0;
 951     while( i_start < EIA608_SCREEN_COLUMNS-1 && p_char[i_start] == ' ' )
 952         i_start++;
 953
 954     /* Search the end */
 955     i_end = EIA608_SCREEN_COLUMNS-1;
 956     while( i_end > i_start && p_char[i_end] == ' ' )
 957         i_end--;
 958
 959     /* */
 960 #define CAT(t) Eia608Strlcat( psz_text, t, i_text_max )
 961     for( x = i_start; x <= i_end; x++ )
 962     {
 963         eia608_color_t color = p_color[x];
 964         bool b_italics = p_font[x] & EIA608_FONT_ITALICS;
 965         bool b_underline = p_font[x] & EIA608_FONT_UNDERLINE;
 966         char utf8[4];
 967
 968         /* */
 969         if( b_html )
 970         {
 971             bool b_close_color, b_close_italics, b_close_underline;
 972
 973             /* We create the tags font / i / u in that orders */
 974             b_close_color = color != last_color && last_color != EIA608_COLOR_DEFAULT;
 975             b_close_italics = !b_italics && b_last_italics;
 976             b_close_underline = !b_underline && b_last_underline;
 977
 978             /* Be sure to create valid html */
 979             b_close_italics |= b_last_italics && b_close_color;
 980             b_close_underline |= b_last_underline && ( b_close_italics || b_close_color );
 981
 982             if( b_close_underline )
 983                 CAT( "</u>" );
 984             if( b_close_italics )
 985                 CAT( "</i>" );
 986             if( b_close_color )
 987                 CAT( "</font>" );
 988
 989             if( color != EIA608_COLOR_DEFAULT && color != last_color)
 990             {
 991                 static const char *ppsz_color[] = {
 992                     "#ffffff",  // white
 993                     "#00ff00",  // green
 994                     "#0000ff",  // blue
 995                     "#00ffff",  // cyan
 996                     "#ff0000",  // red
 997                     "#ffff00",  // yellow
 998                     "#ff00ff",  // magenta
 999                     "#ffffff",  // user defined XXX we use white
1000                 };
1001                 CAT( "<font color=" );
1002                 CAT( ppsz_color[color] );
1003                 CAT( ">" );
1004             }
1005             if( ( b_close_italics && b_italics ) || ( b_italics && !b_last_italics ) )
1006                 CAT( "<i>" );
1007             if( ( b_close_underline && b_underline ) || ( b_underline && !b_last_underline ) )
1008                 CAT( "<u>" );
1009         }
1010
1011         /* */
1012         Eia608TextUtf8( utf8, p_char[x] );
1013         CAT( utf8 );
1014
1015         /* */
1016         b_last_underline = b_underline;
1017         b_last_italics = b_italics;
1018         last_color = color;
1019     }
1020     if( b_html )
1021     {
1022         if( b_last_underline )
1023             CAT( "</u>" );
1024         if( b_last_italics )
1025             CAT( "</i>" );
1026         if( last_color != EIA608_COLOR_DEFAULT )
1027             CAT( "</font>" );
1028     }
1029 #undef CAT
1030 }
1031
1032 /* */
1033 static void Eia608Init( eia608_t *h )
1034 {
1035     memset( h, 0, sizeof(*h) );
1036
1037     /* */
1038     h->i_channel = -1;
1039
1040     h->i_screen = 0;
1041     Eia608ClearScreen( h, 0 );
1042     Eia608ClearScreen( h, 1 );
1043
1044     /* Cursor for writing text */
1045     h->cursor.i_column = 0;
1046     h->cursor.i_row = 0;
1047
1048     h->last.d1 = 0x00;
1049     h->last.d2 = 0x00;
1050     h->mode = EIA608_MODE_POPUP;
1051     h->color = EIA608_COLOR_DEFAULT;
1052     h->font = EIA608_FONT_REGULAR;
1053     h->i_row_rollup = EIA608_SCREEN_ROWS-1;
1054 }
1055 static bool Eia608Parse( eia608_t *h, int i_channel_selected, const uint8_t data[2] )
1056 {
1057     const uint8_t d1 = data[0] & 0x7f; /* Removed parity bit */
1058     const uint8_t d2 = data[1] & 0x7f;
1059     bool b_screen_changed = false;
1060
1061     if( d1 == 0 && d2 == 0 )
1062         return false;   /* Ignore padding (parity check are sometimes invalid on them) */
1063
1064     Eia608ParseChannel( h, data );
1065     if( h->i_channel != i_channel_selected )
1066         return false;
1067     //fprintf( stderr, "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC %x %x\n", data[0], data[1] );
1068
1069     if( d1 >= 0x10 )
1070     {
1071         if( d1 >= 0x20 ||
1072             d1 != h->last.d1 || d2 != h->last.d2 ) /* Command codes can be repeated */
1073             b_screen_changed = Eia608ParseData( h, d1,d2 );
1074
1075         h->last.d1 = d1;
1076         h->last.d2 = d2;
1077     }
1078     else if( ( d1 >= 0x01 && d1 <= 0x0E ) || d1 == 0x0F )
1079     {
1080         /* XDS block / End of XDS block */
1081     }
1082     return b_screen_changed;
1083 }
1084
1085 static char *Eia608Text( eia608_t *h, bool b_html )
1086 {
1087     const int i_size = EIA608_SCREEN_ROWS * 3 * EIA608_SCREEN_COLUMNS+1;
1088     struct eia608_screen *screen = &h->screen[h->i_screen];
1089     bool b_first = true;
1090     char *psz;
1091     int i;
1092
1093     /* We allocate a buffer big enough for normal case */
1094     psz = malloc( i_size );
1095     if( !psz )
1096         return NULL;
1097     *psz = '\0';
1098     if( b_html )
1099         Eia608Strlcat( psz, "<text>", i_size );
1100     for( i = 0; i < EIA608_SCREEN_ROWS; i++ )
1101     {
1102         if( !screen->row_used[i] )
1103             continue;
1104
1105         if( !b_first )
1106             Eia608Strlcat( psz, b_html ? "<br />" : "\n", i_size );
1107         b_first = false;
1108
1109         Eia608TextLine( screen, psz, i_size, i, b_html );
1110     }
1111     if( b_html )
1112         Eia608Strlcat( psz, "</text>", i_size );
1113     return psz;
1114 }
1115
1116 static void Eia608Exit( eia608_t *h )
1117 {
1118     VLC_UNUSED( h );
1119 }
1120