1 /*****************************************************************************
2 * dvbsub.c : DVB subtitles decoder
3 * DVB subtitles encoder (developed for Anevia, www.anevia.com)
4 *****************************************************************************
5 * Copyright (C) 2003 ANEVIA
6 * Copyright (C) 2003-2004 VideoLAN
9 * Authors: Gildas Bazin <gbazin@videolan.org>
10 * Damien LUCAS <damien.lucas@anevia.com>
11 * Laurent Aimar <fenrir@via.ecp.fr>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
26 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
32 #include <vlc/decoder.h>
37 //#define DEBUG_DVBSUB 1
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Open ( vlc_object_t * );
43 static void Close( vlc_object_t * );
44 static subpicture_t *Decode( decoder_t *, block_t ** );
46 static int OpenEncoder ( vlc_object_t * );
47 static void CloseEncoder( vlc_object_t * );
48 static block_t *Encode ( encoder_t *, subpicture_t * );
51 set_description( _("DVB subtitles decoder") );
52 set_capability( "decoder", 50 );
53 set_callbacks( Open, Close );
55 # define ENC_CFG_PREFIX "sout-dvbsub-"
57 set_description( _("DVB subtitles encoder") );
58 set_capability( "encoder", 100 );
59 set_callbacks( OpenEncoder, CloseEncoder );
62 static const char *ppsz_enc_options[] = { NULL };
64 /****************************************************************************
66 ****************************************************************************
67 * Those structures refer closely to the ETSI 300 743 Object model
68 ****************************************************************************/
70 /* The object definition gives the position of the object in a region */
71 typedef struct dvbsub_objectdef_s
82 /* The entry in the palette CLUT */
93 typedef struct dvbsub_clut_s
97 dvbsub_color_t c_2b[4];
98 dvbsub_color_t c_4b[16];
99 dvbsub_color_t c_8b[256];
101 struct dvbsub_clut_s *p_next;
105 /* The Region is an aera on the image
106 * with a list of the object definitions associated and a CLUT */
107 typedef struct dvbsub_region_s
122 dvbsub_objectdef_t *p_object_defs;
124 struct dvbsub_region_s *p_next;
128 /* The object definition gives the position of the object in a region */
129 typedef struct dvbsub_regiondef_s
135 } dvbsub_regiondef_t;
137 /* The page defines the list of regions */
146 dvbsub_regiondef_t *p_region_defs;
154 /* Decoder internal data */
159 dvbsub_page_t *p_page;
160 dvbsub_region_t *p_regions;
161 dvbsub_clut_t *p_cluts;
162 dvbsub_clut_t default_clut;
166 // List of different SEGMENT TYPES
167 // According to EN 300-743, table 2
168 #define DVBSUB_ST_PAGE_COMPOSITION 0x10
169 #define DVBSUB_ST_REGION_COMPOSITION 0x11
170 #define DVBSUB_ST_CLUT_DEFINITION 0x12
171 #define DVBSUB_ST_OBJECT_DATA 0x13
172 #define DVBSUB_ST_ENDOFDISPLAY 0x80
173 #define DVBSUB_ST_STUFFING 0xff
174 // List of different OBJECT TYPES
175 // According to EN 300-743, table 6
176 #define DVBSUB_OT_BASIC_BITMAP 0x00
177 #define DVBSUB_OT_BASIC_CHAR 0x01
178 #define DVBSUB_OT_COMPOSITE_STRING 0x02
180 // According to EN 300-743, table 9
181 #define DVBSUB_DT_2BP_CODE_STRING 0x10
182 #define DVBSUB_DT_4BP_CODE_STRING 0x11
183 #define DVBSUB_DT_8BP_CODE_STRING 0x12
184 #define DVBSUB_DT_24_TABLE_DATA 0x20
185 #define DVBSUB_DT_28_TABLE_DATA 0x21
186 #define DVBSUB_DT_48_TABLE_DATA 0x22
187 #define DVBSUB_DT_END_LINE 0xf0
188 // List of different Page Composition Segment state
189 // According to EN 300-743, 7.2.1 table 3
190 #define DVBSUB_PCS_STATE_ACQUISITION 0x01
191 #define DVBSUB_PCS_STATE_CHANGE 0x10
193 /*****************************************************************************
195 *****************************************************************************/
196 static void decode_segment( decoder_t *, bs_t * );
197 static void decode_page_composition( decoder_t *, bs_t * );
198 static void decode_region_composition( decoder_t *, bs_t * );
199 static void decode_object( decoder_t *, bs_t * );
200 static void decode_clut( decoder_t *, bs_t * );
201 static void free_all( decoder_t * );
203 static void default_clut_init( decoder_t * );
205 static subpicture_t *render( decoder_t * );
207 /*****************************************************************************
208 * Open: probe the decoder and return score
209 *****************************************************************************
210 * Tries to launch a decoder and return score so that the interface is able
212 *****************************************************************************/
213 static int Open( vlc_object_t *p_this )
215 decoder_t *p_dec = (decoder_t *) p_this;
216 decoder_sys_t *p_sys;
218 if( p_dec->fmt_in.i_codec != VLC_FOURCC('d','v','b','s') )
223 p_dec->pf_decode_sub = Decode;
224 p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
225 memset( p_sys, 0, sizeof(decoder_sys_t) );
228 p_sys->i_id = p_dec->fmt_in.subs.dvb.i_id & 0xFFFF;
229 p_sys->i_ancillary_id = p_dec->fmt_in.subs.dvb.i_id >> 16;
230 p_sys->p_regions = NULL;
231 p_sys->p_cluts = NULL;
232 p_sys->p_page = NULL;
234 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 'd','v','b','s' ) );
236 default_clut_init( p_dec );
241 /*****************************************************************************
243 *****************************************************************************/
244 static void Close( vlc_object_t *p_this )
246 decoder_t *p_dec = (decoder_t*) p_this;
247 decoder_sys_t *p_sys = p_dec->p_sys;
253 /*****************************************************************************
255 *****************************************************************************/
256 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
258 decoder_sys_t *p_sys = p_dec->p_sys;
260 subpicture_t *p_spu = NULL;
262 if( pp_block == NULL || *pp_block == NULL ) return NULL;
266 p_sys->i_pts = p_block->i_pts;
267 if( p_sys->i_pts <= 0 )
270 /* Some DVB channels send stuffing segments in non-dated packets so
271 * don't complain too loudly. */
272 msg_Warn( p_dec, "non dated subtitle" );
274 block_Release( p_block );
278 bs_init( &p_sys->bs, p_block->p_buffer, p_block->i_buffer );
280 if( bs_read( &p_sys->bs, 8 ) != 0x20 ) /* Data identifier */
282 msg_Dbg( p_dec, "invalid data identifier" );
283 block_Release( p_block );
287 if( bs_read( &p_sys->bs, 8 ) ) /* Subtitle stream id */
289 msg_Dbg( p_dec, "invalid subtitle stream id" );
290 block_Release( p_block );
295 msg_Dbg( p_dec, "subtitle packet received: "I64Fd, p_sys->i_pts );
298 while( bs_show( &p_sys->bs, 8 ) == 0x0f ) /* Sync byte */
300 decode_segment( p_dec, &p_sys->bs );
303 if( bs_read( &p_sys->bs, 8 ) != 0xff ) /* End marker */
305 msg_Warn( p_dec, "end marker not found (corrupted subtitle ?)" );
306 block_Release( p_block );
310 /* Check if the page is to be displayed */
311 if( p_sys->p_page ) p_spu = render( p_dec );
313 block_Release( p_block );
318 /* following functions are local */
320 /*****************************************************************************
321 * default_clut_init: default clut as defined in EN 300-743 section 10
322 *****************************************************************************/
323 static void default_clut_init( decoder_t *p_dec )
325 decoder_sys_t *p_sys = p_dec->p_sys;
328 #define RGB_TO_Y(r, g, b) ((int16_t) 77 * r + 150 * g + 29 * b) / 256;
329 #define RGB_TO_U(r, g, b) ((int16_t) -44 * r - 87 * g + 131 * b) / 256;
330 #define RGB_TO_V(r, g, b) ((int16_t) 131 * r - 110 * g - 21 * b) / 256;
333 for( i = 0; i < 4; i++ )
335 uint8_t R = 0, G = 0, B = 0, T = 0;
337 if( !(i & 0x2) && !(i & 0x1) ) T = 0xFF;
338 else if( !(i & 0x2) && (i & 0x1) ) R = G = B = 0xFF;
339 else if( (i & 0x2) && !(i & 0x1) ) R = G = B = 0;
340 else R = G = B = 0x7F;
342 p_sys->default_clut.c_2b[i].Y = RGB_TO_Y(R,G,B);
343 p_sys->default_clut.c_2b[i].Cr = RGB_TO_U(R,G,B);
344 p_sys->default_clut.c_2b[i].Cb = RGB_TO_V(R,G,B);
345 p_sys->default_clut.c_2b[i].T = T;
348 /* 16 entries CLUT */
349 for( i = 0; i < 16; i++ )
351 uint8_t R = 0, G = 0, B = 0, T = 0;
355 if( !(i & 0x4) && !(i & 0x2) && !(i & 0x1) )
361 R = (i & 0x1) ? 0xFF : 0;
362 G = (i & 0x2) ? 0xFF : 0;
363 B = (i & 0x4) ? 0xFF : 0;
368 R = (i & 0x1) ? 0x7F : 0;
369 G = (i & 0x2) ? 0x7F : 0;
370 B = (i & 0x4) ? 0x7F : 0;
373 p_sys->default_clut.c_4b[i].Y = RGB_TO_Y(R,G,B);
374 p_sys->default_clut.c_4b[i].Cr = RGB_TO_U(R,G,B);
375 p_sys->default_clut.c_4b[i].Cb = RGB_TO_V(R,G,B);
376 p_sys->default_clut.c_4b[i].T = T;
379 /* 256 entries CLUT (TODO) */
380 memset( p_sys->default_clut.c_8b, 0xFF, 256 * sizeof(dvbsub_color_t) );
383 static void decode_segment( decoder_t *p_dec, bs_t *s )
385 decoder_sys_t *p_sys = p_dec->p_sys;
390 /* sync_byte (already checked) */
394 i_type = bs_read( s, 8 );
397 i_page_id = bs_read( s, 16 );
400 i_size = bs_show( s, 16 );
402 if( i_page_id != p_sys->i_id && i_page_id != p_sys->i_ancillary_id )
405 msg_Dbg( p_dec, "subtitle skipped (page id: %i, %i)",
406 i_page_id, p_sys->i_id );
408 bs_skip( s, 8 * ( 2 + i_size ) );
413 if( i_page_id == p_sys->i_id )
414 msg_Dbg( p_dec, "segment (id: %i)", i_page_id );
416 msg_Dbg( p_dec, "ancillary segment (id: %i)", i_page_id );
421 case DVBSUB_ST_PAGE_COMPOSITION:
423 msg_Dbg( p_dec, "decode_page_composition" );
425 decode_page_composition( p_dec, s );
428 case DVBSUB_ST_REGION_COMPOSITION:
430 msg_Dbg( p_dec, "decode_region_composition" );
432 decode_region_composition( p_dec, s );
435 case DVBSUB_ST_CLUT_DEFINITION:
437 msg_Dbg( p_dec, "decode_clut" );
439 decode_clut( p_dec, s );
442 case DVBSUB_ST_OBJECT_DATA:
444 msg_Dbg( p_dec, "decode_object" );
446 decode_object( p_dec, s );
449 case DVBSUB_ST_ENDOFDISPLAY:
451 msg_Dbg( p_dec, "end of display" );
453 bs_skip( s, 8 * ( 2 + i_size ) );
456 case DVBSUB_ST_STUFFING:
458 msg_Dbg( p_dec, "skip stuffing" );
460 bs_skip( s, 8 * ( 2 + i_size ) );
464 msg_Warn( p_dec, "unsupported segment type: (%04x)", i_type );
465 bs_skip( s, 8 * ( 2 + i_size ) );
470 static void decode_clut( decoder_t *p_dec, bs_t *s )
472 decoder_sys_t *p_sys = p_dec->p_sys;
473 uint16_t i_segment_length;
474 uint16_t i_processed_length;
475 dvbsub_clut_t *p_clut;
478 i_segment_length = bs_read( s, 16 );
479 i_id = bs_read( s, 8 );
480 i_version = bs_read( s, 4 );
482 /* Check if we already have this clut */
483 for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut->p_next )
485 if( p_clut->i_id == i_id ) break;
488 /* Check version number */
489 if( p_clut && p_clut->i_version == i_version )
492 bs_skip( s, 8 * i_segment_length - 12 );
499 msg_Dbg( p_dec, "new clut: %i", i_id );
501 p_clut = malloc( sizeof(dvbsub_clut_t) );
502 p_clut->p_next = p_sys->p_cluts;
503 p_sys->p_cluts = p_clut;
506 /* TODO: initialize to default clut */
508 /* We don't have this version of the CLUT: Parse it */
509 p_clut->i_version = i_version;
511 bs_skip( s, 4 ); /* Reserved bits */
512 i_processed_length = 2;
513 while( i_processed_length < i_segment_length )
515 uint8_t y, cb, cr, t;
519 i_id = bs_read( s, 8 );
520 i_type = bs_read( s, 3 );
524 if( bs_read( s, 1 ) )
527 cr = bs_read( s, 8 );
528 cb = bs_read( s, 8 );
530 i_processed_length += 6;
534 y = bs_read( s, 6 ) << 2;
535 cr = bs_read( s, 4 ) << 4;
536 cb = bs_read( s, 4 ) << 4;
537 t = bs_read( s, 2 ) << 6;
538 i_processed_length += 4;
541 /* We are not entirely compliant here as full transparency is indicated
542 * with a luma value of zero, not a transparency value of 0xff
543 * (full transparency would actually be 0xff + 1). */
551 /* According to EN 300-743 section 7.2.3 note 1, type should
552 * not have more than 1 bit set to one, but some streams don't
553 * respect this note. */
557 p_clut->c_2b[i_id].Y = y;
558 p_clut->c_2b[i_id].Cr = cr;
559 p_clut->c_2b[i_id].Cb = cb;
560 p_clut->c_2b[i_id].T = t;
564 p_clut->c_4b[i_id].Y = y;
565 p_clut->c_4b[i_id].Cr = cr;
566 p_clut->c_4b[i_id].Cb = cb;
567 p_clut->c_4b[i_id].T = t;
571 p_clut->c_8b[i_id].Y = y;
572 p_clut->c_8b[i_id].Cr = cr;
573 p_clut->c_8b[i_id].Cb = cb;
574 p_clut->c_8b[i_id].T = t;
579 static void decode_page_composition( decoder_t *p_dec, bs_t *s )
581 decoder_sys_t *p_sys = p_dec->p_sys;
582 int i_version, i_state, i_segment_length, i_timeout, i;
584 /* A page is composed by 0 or more region */
586 i_segment_length = bs_read( s, 16 );
587 i_timeout = bs_read( s, 8 );
588 i_version = bs_read( s, 4 );
589 i_state = bs_read( s, 2 );
590 bs_skip( s, 2 ); /* Reserved */
592 if( i_state == DVBSUB_PCS_STATE_CHANGE )
594 /* End of an epoch, reset decoder buffer */
596 msg_Dbg( p_dec, "page composition mode change" );
600 else if( !p_sys->p_page && i_state != DVBSUB_PCS_STATE_ACQUISITION )
603 /* Not a full PCS, we need to wait for one */
604 msg_Dbg( p_dec, "didn't receive an acquisition page yet" );
605 bs_skip( s, 8 * (i_segment_length - 2) );
611 if( i_state == DVBSUB_PCS_STATE_ACQUISITION )
612 msg_Dbg( p_dec, "acquisition page composition" );
615 /* Check version number */
616 if( p_sys->p_page && p_sys->p_page->i_version == i_version )
618 bs_skip( s, 8 * (i_segment_length - 2) );
621 else if( p_sys->p_page )
623 if( p_sys->p_page->i_region_defs )
624 free( p_sys->p_page->p_region_defs );
625 p_sys->p_page->i_region_defs = 0;
631 msg_Dbg( p_dec, "new page" );
633 /* Allocate a new page */
634 p_sys->p_page = malloc( sizeof(dvbsub_page_t) );
637 p_sys->p_page->i_version = i_version;
638 p_sys->p_page->i_timeout = i_timeout;
640 /* Number of regions */
641 p_sys->p_page->i_region_defs = (i_segment_length - 2) / 6;
643 if( p_sys->p_page->i_region_defs == 0 ) return;
645 p_sys->p_page->p_region_defs =
646 malloc( p_sys->p_page->i_region_defs * sizeof(dvbsub_region_t) );
647 for( i = 0; i < p_sys->p_page->i_region_defs; i++ )
649 p_sys->p_page->p_region_defs[i].i_id = bs_read( s, 8 );
650 bs_skip( s, 8 ); /* Reserved */
651 p_sys->p_page->p_region_defs[i].i_x = bs_read( s, 16 );
652 p_sys->p_page->p_region_defs[i].i_y = bs_read( s, 16 );
655 msg_Dbg( p_dec, "page_composition, region %i (%i,%i)",
656 i, p_sys->p_page->p_region_defs[i].i_x,
657 p_sys->p_page->p_region_defs[i].i_y );
662 static void decode_region_composition( decoder_t *p_dec, bs_t *s )
664 decoder_sys_t *p_sys = p_dec->p_sys;
665 dvbsub_region_t *p_region, **pp_region = &p_sys->p_regions;
666 int i_segment_length, i_processed_length, i_id, i_version;
667 int i_width, i_height, i_level_comp, i_depth, i_clut;
668 int i_8_bg, i_4_bg, i_2_bg;
671 i_segment_length = bs_read( s, 16 );
672 i_id = bs_read( s, 8 );
673 i_version = bs_read( s, 4 );
675 /* Check if we already have this region */
676 for( p_region = p_sys->p_regions; p_region != NULL;
677 p_region = p_region->p_next )
679 pp_region = &p_region->p_next;
680 if( p_region->i_id == i_id ) break;
683 /* Check version number */
684 if( p_region && p_region->i_version == i_version )
686 bs_skip( s, 8 * (i_segment_length - 1) - 4 );
693 msg_Dbg( p_dec, "new region: %i", i_id );
695 p_region = *pp_region = malloc( sizeof(dvbsub_region_t) );
696 memset( p_region, 0, sizeof(dvbsub_region_t) );
697 p_region->p_object_defs = NULL;
698 p_region->p_pixbuf = NULL;
699 p_region->p_next = NULL;
702 /* Region attributes */
703 p_region->i_id = i_id;
704 p_region->i_version = i_version;
705 b_fill = bs_read( s, 1 );
706 bs_skip( s, 3 ); /* Reserved */
708 i_width = bs_read( s, 16 );
709 i_height = bs_read( s, 16 );
710 i_level_comp = bs_read( s, 3 );
711 i_depth = bs_read( s, 3 );
712 bs_skip( s, 2 ); /* Reserved */
713 i_clut = bs_read( s, 8 );
715 i_8_bg = bs_read( s, 8 );
716 i_4_bg = bs_read( s, 4 );
717 i_2_bg = bs_read( s, 2 );
718 bs_skip( s, 2 ); /* Reserved */
719 p_region->i_object_defs = 0;
721 /* Extra sanity checks */
722 if( p_region->i_width != i_width || p_region->i_height != i_height )
724 if( p_region->p_pixbuf )
726 msg_Dbg( p_dec, "region size changed (not allowed)" );
727 free( p_region->p_pixbuf );
730 p_region->p_pixbuf = malloc( i_height * i_width );
733 if( p_region->i_depth != i_depth ||
734 p_region->i_level_comp != i_level_comp || p_region->i_clut != i_clut )
736 msg_Dbg( p_dec, "region parameters changed (not allowed)" );
739 /* Erase background of region */
742 int i_background = (p_region->i_depth == 1) ? i_2_bg :
743 (p_region->i_depth == 2) ? i_4_bg : i_8_bg;
744 memset( p_region->p_pixbuf, i_background, i_width * i_height );
747 p_region->i_width = i_width;
748 p_region->i_height = i_height;
749 p_region->i_level_comp = i_level_comp;
750 p_region->i_depth = i_depth;
751 p_region->i_clut = i_clut;
753 /* List of objects in the region */
754 i_processed_length = 10;
755 while( i_processed_length < i_segment_length )
757 dvbsub_objectdef_t *p_obj;
759 /* We create a new object */
760 p_region->i_object_defs++;
761 p_region->p_object_defs =
762 realloc( p_region->p_object_defs,
763 sizeof(dvbsub_objectdef_t) * p_region->i_object_defs );
765 /* We parse object properties */
766 p_obj = &p_region->p_object_defs[p_region->i_object_defs - 1];
767 p_obj->i_id = bs_read( s, 16 );
768 p_obj->i_type = bs_read( s, 2 );
769 bs_skip( s, 2 ); /* Provider */
770 p_obj->i_x = bs_read( s, 12 );
771 bs_skip( s, 4 ); /* Reserved */
772 p_obj->i_y = bs_read( s, 12 );
774 i_processed_length += 6;
776 if( p_obj->i_type == DVBSUB_OT_BASIC_CHAR ||
777 p_obj->i_type == DVBSUB_OT_COMPOSITE_STRING )
779 p_obj->i_fg_pc = bs_read( s, 8 );
780 p_obj->i_bg_pc = bs_read( s, 8 );
781 i_processed_length += 2;
786 static void dvbsub_render_pdata( decoder_t *, dvbsub_region_t *, int, int,
788 static void dvbsub_pdata2bpp( bs_t *, uint8_t *, int * );
789 static void dvbsub_pdata4bpp( bs_t *, uint8_t *, int * );
790 static void dvbsub_pdata8bpp( bs_t *, uint8_t *, int * );
792 static void decode_object( decoder_t *p_dec, bs_t *s )
794 decoder_sys_t *p_sys = p_dec->p_sys;
795 dvbsub_region_t *p_region;
796 int i_segment_length, i_coding_method, i_version, i_id, i;
797 vlc_bool_t b_non_modify_color;
799 i_segment_length = bs_read( s, 16 );
800 i_id = bs_read( s, 16 );
801 i_version = bs_read( s, 4 );
802 i_coding_method = bs_read( s, 2 );
804 if( i_coding_method )
806 /* TODO: DVB subtitling as characters */
807 msg_Dbg( p_dec, "DVB subtitling as characters is not handled!" );
808 bs_skip( s, 8 * (i_segment_length - 2) - 6 );
812 /* Check if the object needs to be rendered in at least one
814 for( p_region = p_sys->p_regions; p_region != NULL;
815 p_region = p_region->p_next )
817 for( i = 0; i < p_region->i_object_defs; i++ )
818 if( p_region->p_object_defs[i].i_id == i_id ) break;
820 if( i != p_region->i_object_defs ) break;
824 bs_skip( s, 8 * (i_segment_length - 2) - 6 );
829 msg_Dbg( p_dec, "new object: %i", i_id );
832 b_non_modify_color = bs_read( s, 1 );
833 bs_skip( s, 1 ); /* Reserved */
835 if( i_coding_method == 0x00 )
837 int i_topfield, i_bottomfield;
838 uint8_t *p_topfield, *p_bottomfield;
840 i_topfield = bs_read( s, 16 );
841 i_bottomfield = bs_read( s, 16 );
842 p_topfield = s->p_start + bs_pos( s ) / 8;
843 p_bottomfield = p_topfield + i_topfield;
845 for( p_region = p_sys->p_regions; p_region != NULL;
846 p_region = p_region->p_next )
848 for( i = 0; i < p_region->i_object_defs; i++ )
850 if( p_region->p_object_defs[i].i_id != i_id ) continue;
852 dvbsub_render_pdata( p_dec, p_region,
853 p_region->p_object_defs[i].i_x,
854 p_region->p_object_defs[i].i_y,
855 p_topfield, i_topfield );
856 dvbsub_render_pdata( p_dec, p_region,
857 p_region->p_object_defs[i].i_x,
858 p_region->p_object_defs[i].i_y + 1,
859 p_bottomfield, i_bottomfield );
863 bs_skip( s, (i_topfield + i_bottomfield) * 8 );
865 /* Check word-alignement */
867 if( bs_pos( s ) % 16 ) bs_skip( s, 8 );
871 /* TODO: DVB subtitling as characters */
875 msg_Dbg( p_dec, "end object: %i", i_id );
879 static void dvbsub_render_pdata( decoder_t *p_dec, dvbsub_region_t *p_region,
881 uint8_t *p_field, int i_field )
883 uint8_t *p_pixbuf = p_region->p_pixbuf + i_y * p_region->i_width;
887 bs_init( &bs, p_field, i_field );
889 while( !bs_eof( &bs ) )
891 switch( bs_read( &bs, 8 ) )
894 dvbsub_pdata2bpp( &bs, p_pixbuf + i_x, &i_offset );
897 dvbsub_pdata4bpp( &bs, p_pixbuf + i_x, &i_offset );
900 dvbsub_pdata8bpp( &bs, p_pixbuf + i_x, &i_offset );
905 /* We don't use map tables */
908 p_pixbuf += 2*p_region->i_width; /* End of line code */
915 static void dvbsub_pdata2bpp( bs_t *s, uint8_t *p, int *pi_off )
917 vlc_bool_t b_stop = 0;
918 uint16_t i_count = 0;
921 while( !b_stop && !bs_eof( s ) )
923 if( (i_color = bs_read( s, 2 )) != 0x00 )
925 p[*pi_off] = i_color;
930 if( bs_read( s, 1 ) == 0x01 ) // Switch1
932 i_count = 3 + bs_read( s, 3 );
933 i_color = bs_read( s, 2 );
934 memset( p + *pi_off, i_color, i_count );
935 (*pi_off) += i_count;
939 if( bs_read( s, 1 ) == 0x00 ) //Switch2
941 switch( bs_read( s, 2 ) ) //Switch3
947 memset( p + *pi_off, 0, 2 );
951 i_count = 12 + bs_read( s, 4 );
952 i_color = bs_read( s, 2 );
953 memset( p + *pi_off, i_color, i_count );
954 (*pi_off) += i_count;
957 i_count = 29 + bs_read( s, 8 );
958 i_color = bs_read( s, 2 );
959 memset( p + *pi_off, i_color, i_count );
960 (*pi_off) += i_count;
968 /* 1 pixel color 0 */
979 static void dvbsub_pdata4bpp( bs_t *s, uint8_t* p, int *pi_off )
981 vlc_bool_t b_stop = 0;
982 uint16_t i_count = 0;
985 while( !b_stop && !bs_eof( s ) )
987 if( (i_color = bs_read( s, 4 )) != 0x00 )
990 p[*pi_off] = i_color;
995 if( bs_read( s, 1 ) == 0x00 ) // Switch1
997 if( bs_show( s, 3 ) != 0x00 )
999 i_count = 2 + bs_read( s, 3 );
1000 memset( p + *pi_off, 0, i_count );
1001 (*pi_off) += i_count;
1011 if( bs_read( s, 1 ) == 0x00) //Switch2
1013 i_count = 4 + bs_read( s, 2 );
1014 i_color = bs_read( s, 4 );
1015 memset( p + *pi_off, i_color, i_count );
1016 (*pi_off) += i_count;
1020 switch ( bs_read( s, 2 ) ) //Switch3
1023 memset( p + *pi_off, 0, 1 );
1027 memset( p + *pi_off, 0, 2 );
1031 i_count = 9 + bs_read( s, 4 );
1032 i_color = bs_read( s, 4 );
1033 memset( p + *pi_off, i_color, i_count );
1034 (*pi_off) += i_count;
1037 i_count= 25 + bs_read( s, 8 );
1038 i_color = bs_read( s, 4 );
1039 memset( p + *pi_off, i_color, i_count );
1040 (*pi_off) += i_count;
1051 static void dvbsub_pdata8bpp( bs_t *s, uint8_t* p, int *pi_off )
1053 vlc_bool_t b_stop = 0;
1054 uint16_t i_count = 0;
1055 uint8_t i_color = 0;
1057 while( !b_stop && !bs_eof( s ) )
1059 if( (i_color = bs_read( s, 8 )) != 0x00 )
1062 p[*pi_off] = i_color;
1067 if( bs_read( s, 1 ) == 0x00 ) // Switch1
1069 if( bs_show( s, 7 ) != 0x00 )
1071 i_count = bs_read( s, 7 );
1072 memset( p + *pi_off, 0, i_count );
1073 (*pi_off) += i_count;
1083 i_count = bs_read( s, 7 );
1084 i_color = bs_read( s, 8 );
1085 memset( p + *pi_off, i_color, i_count );
1086 (*pi_off) += i_count;
1094 static void free_all( decoder_t *p_dec )
1096 decoder_sys_t *p_sys = p_dec->p_sys;
1097 dvbsub_region_t *p_reg, *p_reg_next;
1098 dvbsub_clut_t *p_clut, *p_clut_next;
1100 for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut_next )
1102 p_clut_next = p_clut->p_next;
1105 p_sys->p_cluts = NULL;
1107 for( p_reg = p_sys->p_regions; p_reg != NULL; p_reg = p_reg_next )
1109 p_reg_next = p_reg->p_next;
1110 if( p_reg->i_object_defs ) free( p_reg->p_object_defs );
1111 if( p_reg->p_pixbuf ) free( p_reg->p_pixbuf );
1114 p_sys->p_regions = NULL;
1118 if( p_sys->p_page->i_region_defs )
1119 free( p_sys->p_page->p_region_defs );
1120 free( p_sys->p_page );
1122 p_sys->p_page = NULL;
1125 static subpicture_t *render( decoder_t *p_dec )
1127 decoder_sys_t *p_sys = p_dec->p_sys;
1128 subpicture_t *p_spu;
1129 subpicture_region_t **pp_spu_region;
1130 int i, j, i_timeout = 0;
1132 /* Allocate the subpicture internal data. */
1133 p_spu = p_dec->pf_spu_buffer_new( p_dec );
1134 if( !p_spu ) return NULL;
1136 pp_spu_region = &p_spu->p_region;
1138 /* Loop on region definitions */
1141 msg_Dbg( p_dec, "rendering %i regions", p_sys->p_page->i_region_defs );
1144 for( i = 0; p_sys->p_page && i < p_sys->p_page->i_region_defs; i++ )
1146 dvbsub_region_t *p_region;
1147 dvbsub_regiondef_t *p_regiondef;
1148 dvbsub_clut_t *p_clut;
1149 dvbsub_color_t *p_color;
1150 subpicture_region_t *p_spu_region;
1151 uint8_t *p_src, *p_dst;
1155 i_timeout = p_sys->p_page->i_timeout;
1157 p_regiondef = &p_sys->p_page->p_region_defs[i];
1160 msg_Dbg( p_dec, "rendering region %i (%i,%i)", i,
1161 p_regiondef->i_x, p_regiondef->i_y );
1164 /* Find associated region */
1165 for( p_region = p_sys->p_regions; p_region != NULL;
1166 p_region = p_region->p_next )
1168 if( p_regiondef->i_id == p_region->i_id ) break;
1173 msg_Err( p_dec, "no region founddddd!!!" );
1177 /* Find associated CLUT */
1178 for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut->p_next )
1180 if( p_region->i_clut == p_clut->i_id ) break;
1184 msg_Warn( p_dec, "clut %i not found", p_region->i_clut );
1185 p_clut = &p_sys->default_clut;
1188 /* Create new SPU region */
1189 memset( &fmt, 0, sizeof(video_format_t) );
1190 fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
1191 fmt.i_aspect = VOUT_ASPECT_FACTOR;
1192 fmt.i_width = fmt.i_visible_width = p_region->i_width;
1193 fmt.i_height = fmt.i_visible_height = p_region->i_height;
1194 fmt.i_x_offset = fmt.i_y_offset = 0;
1195 p_spu_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
1198 msg_Err( p_dec, "cannot allocate SPU region" );
1201 p_spu_region->i_x = p_regiondef->i_x;
1202 p_spu_region->i_y = p_regiondef->i_y;
1203 *pp_spu_region = p_spu_region;
1204 pp_spu_region = &p_spu_region->p_next;
1207 fmt.p_palette->i_entries = p_region->i_depth == 1 ? 4 :
1208 p_region->i_depth == 2 ? 16 : 256;
1209 p_color = (p_region->i_depth == 1) ? p_clut->c_2b :
1210 (p_region->i_depth == 2) ? p_clut->c_4b : p_clut->c_8b;
1211 for( j = 0; j < fmt.p_palette->i_entries; j++ )
1213 fmt.p_palette->palette[j][0] = p_color[j].Y;
1214 fmt.p_palette->palette[j][1] = p_color[j].Cr;
1215 fmt.p_palette->palette[j][2] = p_color[j].Cb;
1216 fmt.p_palette->palette[j][3] = 0xff - p_color[j].T;
1219 p_src = p_region->p_pixbuf;
1220 p_dst = p_spu_region->picture.Y_PIXELS;
1221 i_pitch = p_spu_region->picture.Y_PITCH;
1223 /* Copy pixel buffer */
1224 for( j = 0; j < p_region->i_height; j++ )
1226 memcpy( p_dst, p_src, p_region->i_width );
1227 p_src += p_region->i_width;
1232 /* Set the pf_render callback */
1233 p_spu->i_start = p_sys->i_pts;
1234 p_spu->i_stop = p_spu->i_start + i_timeout * 1000000;
1235 p_spu->b_ephemer = VLC_TRUE;
1240 /*****************************************************************************
1241 * encoder_sys_t : encoder descriptor
1242 *****************************************************************************/
1243 struct encoder_sys_t
1245 unsigned int i_page_ver;
1246 unsigned int i_region_ver;
1247 unsigned int i_clut_ver;
1258 static void encode_page_composition( encoder_t *, bs_t *, subpicture_t * );
1259 static void encode_clut( encoder_t *, bs_t *, subpicture_t * );
1260 static void encode_region_composition( encoder_t *, bs_t *, subpicture_t * );
1261 static void encode_object( encoder_t *, bs_t *, subpicture_t * );
1263 /*****************************************************************************
1264 * OpenEncoder: probe the encoder and return score
1265 *****************************************************************************/
1266 static int OpenEncoder( vlc_object_t *p_this )
1268 encoder_t *p_enc = (encoder_t *)p_this;
1269 encoder_sys_t *p_sys;
1271 if( p_enc->fmt_out.i_codec != VLC_FOURCC('d','v','b','s') &&
1274 return VLC_EGENERIC;
1277 /* Allocate the memory needed to store the decoder's structure */
1278 if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
1280 msg_Err( p_enc, "out of memory" );
1281 return VLC_EGENERIC;
1283 p_enc->p_sys = p_sys;
1285 p_enc->pf_encode_sub = Encode;
1286 p_enc->fmt_out.i_codec = VLC_FOURCC('d','v','b','s');
1287 p_enc->fmt_out.subs.dvb.i_id = 1 << 16 | 1;
1289 sout_CfgParse( p_enc, ENC_CFG_PREFIX, ppsz_enc_options, p_enc->p_cfg );
1291 p_sys->i_page_ver = 0;
1292 p_sys->i_region_ver = 0;
1293 p_sys->i_clut_ver = 0;
1298 /****************************************************************************
1299 * Encode: the whole thing
1300 ****************************************************************************/
1301 static block_t *Encode( encoder_t *p_enc, subpicture_t *p_subpic )
1303 bs_t bits, *s = &bits;
1306 if( !p_subpic || !p_subpic->p_region ) return 0;
1308 msg_Dbg( p_enc, "encoding subpicture" );
1310 p_block = block_New( p_enc, 64000 );
1311 bs_init( s, p_block->p_buffer, p_block->i_buffer );
1313 bs_write( s, 8, 0x20 ); /* Data identifier */
1314 bs_write( s, 8, 0x0 ); /* Subtitle stream id */
1316 encode_page_composition( p_enc, s, p_subpic );
1317 encode_region_composition( p_enc, s, p_subpic );
1318 encode_clut( p_enc, s, p_subpic );
1319 encode_object( p_enc, s, p_subpic );
1321 /* End of display */
1322 bs_write( s, 8, 0x0f ); /* Sync byte */
1323 bs_write( s, 8, DVBSUB_ST_ENDOFDISPLAY ); /* Segment type */
1324 bs_write( s, 16, 1 ); /* Page id */
1325 bs_write( s, 16, 0 ); /* Segment length */
1327 bs_write( s, 8, 0xff ); /* End marker */
1328 p_block->i_buffer = bs_pos( s ) / 8;
1329 p_block->i_pts = p_block->i_dts = p_subpic->i_start;
1330 if( !p_subpic->b_ephemer && p_subpic->i_stop )
1331 p_block->i_length = p_subpic->i_stop - p_subpic->i_start;
1333 msg_Dbg( p_enc, "subpicture encoded properly" );
1338 /*****************************************************************************
1339 * CloseEncoder: encoder destruction
1340 *****************************************************************************/
1341 static void CloseEncoder( vlc_object_t *p_this )
1343 encoder_t *p_enc = (encoder_t *)p_this;
1344 encoder_sys_t *p_sys = p_enc->p_sys;
1349 static void encode_page_composition( encoder_t *p_enc, bs_t *s,
1350 subpicture_t *p_subpic )
1352 encoder_sys_t *p_sys = p_enc->p_sys;
1353 subpicture_region_t *p_region;
1356 bs_write( s, 8, 0x0f ); /* Sync byte */
1357 bs_write( s, 8, DVBSUB_ST_PAGE_COMPOSITION ); /* Segment type */
1358 bs_write( s, 16, 1 ); /* Page id */
1360 for( i_regions = 0, p_region = p_subpic->p_region; p_region;
1361 p_region = p_region->p_next, i_regions++ );
1363 bs_write( s, 16, i_regions * 6 + 2 ); /* Segment length */
1365 bs_write( s, 8, 5 ); /* Timeout */
1366 bs_write( s, 4, p_sys->i_page_ver++ );
1367 bs_write( s, 2, DVBSUB_PCS_STATE_ACQUISITION );
1368 bs_write( s, 2, 0 ); /* Reserved */
1370 for( i_regions = 0, p_region = p_subpic->p_region; p_region;
1371 p_region = p_region->p_next, i_regions++ )
1373 bs_write( s, 8, i_regions );
1374 bs_write( s, 8, 0 ); /* Reserved */
1375 bs_write( s, 16, p_region->i_x );
1376 bs_write( s, 16, p_region->i_y );
1380 static void encode_clut( encoder_t *p_enc, bs_t *s, subpicture_t *p_subpic )
1382 encoder_sys_t *p_sys = p_enc->p_sys;
1383 subpicture_region_t *p_region = p_subpic->p_region;
1384 video_palette_t *p_pal;
1388 if( !p_region || !p_region->fmt.p_palette ||
1389 p_region->fmt.i_chroma != VLC_FOURCC('Y','U','V','P') ) return;
1391 bs_write( s, 8, 0x0f ); /* Sync byte */
1392 bs_write( s, 8, DVBSUB_ST_CLUT_DEFINITION ); /* Segment type */
1393 bs_write( s, 16, 1 ); /* Page id */
1395 p_pal = p_region->fmt.p_palette;
1397 bs_write( s, 16, p_pal->i_entries * 6 + 2 ); /* Segment length */
1398 bs_write( s, 8, 1 ); /* Clut id */
1399 bs_write( s, 4, p_sys->i_clut_ver++ );
1400 bs_write( s, 4, 0 ); /* Reserved */
1402 for( i = 0; i < p_pal->i_entries; i++ )
1404 bs_write( s, 8, i ); /* Clut entry id */
1405 bs_write( s, 1, p_pal->i_entries == 4 ); /* 2bit/entry flag */
1406 bs_write( s, 1, p_pal->i_entries == 16 ); /* 4bit/entry flag */
1407 bs_write( s, 1, p_pal->i_entries == 256 ); /* 8bit/entry flag */
1408 bs_write( s, 4, 0 ); /* Reserved */
1409 bs_write( s, 1, 1 ); /* Full range flag */
1410 bs_write( s, 8, p_pal->palette[i][0] ); /* Y value */
1411 bs_write( s, 8, p_pal->palette[i][1] ); /* Cr value */
1412 bs_write( s, 8, p_pal->palette[i][2] ); /* Cb value */
1413 bs_write( s, 8, 0xff - p_pal->palette[i][3] ); /* T value */
1417 static void encode_region_composition( encoder_t *p_enc, bs_t *s,
1418 subpicture_t *p_subpic )
1420 encoder_sys_t *p_sys = p_enc->p_sys;
1421 subpicture_region_t *p_region;
1424 for( i_regions = 0, p_region = p_subpic->p_region; p_region;
1425 p_region = p_region->p_next, i_regions++ )
1427 video_palette_t *p_pal = p_region->fmt.p_palette;
1428 int i_depth = p_pal->i_entries == 4 ? 0x1 :
1429 p_pal->i_entries == 16 ? 0x2 : 0x3;
1431 bs_write( s, 8, 0x0f ); /* Sync byte */
1432 bs_write( s, 8, DVBSUB_ST_REGION_COMPOSITION ); /* Segment type */
1433 bs_write( s, 16, 1 ); /* Page id */
1435 bs_write( s, 16, 10 + 6 ); /* Segment length */
1436 bs_write( s, 8, i_regions );
1437 bs_write( s, 4, p_sys->i_region_ver++ );
1439 /* Region attributes */
1440 bs_write( s, 1, 0 ); /* Fill */
1441 bs_write( s, 3, 0 ); /* Reserved */
1442 bs_write( s, 16, p_region->fmt.i_visible_width );
1443 bs_write( s, 16, p_region->fmt.i_visible_height );
1444 bs_write( s, 3, i_depth ); /* Region level of compatibility */
1445 bs_write( s, 3, i_depth ); /* Region depth */
1446 bs_write( s, 2, 0 ); /* Reserved */
1447 bs_write( s, 8, 1 ); /* Clut id */
1448 bs_write( s, 8, 0 ); /* region 8bit pixel code */
1449 bs_write( s, 4, 0 ); /* region 4bit pixel code */
1450 bs_write( s, 2, 0 ); /* region 2bit pixel code */
1451 bs_write( s, 2, 0 ); /* Reserved */
1453 /* In our implementation we only have 1 object per region */
1454 bs_write( s, 16, i_regions );
1455 bs_write( s, 2, DVBSUB_OT_BASIC_BITMAP );
1456 bs_write( s, 2, 0 ); /* object provider flag */
1457 bs_write( s, 12, 0 ); /* object horizontal position */
1458 bs_write( s, 4, 0 ); /* Reserved */
1459 bs_write( s, 12, 0 ); /* object vertical position */
1463 static void encode_pixel_data( encoder_t *p_enc, bs_t *s,
1464 subpicture_region_t *p_region,
1467 static void encode_object( encoder_t *p_enc, bs_t *s, subpicture_t *p_subpic )
1469 encoder_sys_t *p_sys = p_enc->p_sys;
1470 subpicture_region_t *p_region;
1473 int i_length_pos, i_update_pos, i_pixel_data_pos;
1475 for( i_regions = 0, p_region = p_subpic->p_region; p_region;
1476 p_region = p_region->p_next, i_regions++ )
1478 bs_write( s, 8, 0x0f ); /* Sync byte */
1479 bs_write( s, 8, DVBSUB_ST_OBJECT_DATA ); /* Segment type */
1480 bs_write( s, 16, 1 ); /* Page id */
1482 i_length_pos = bs_pos( s );
1483 bs_write( s, 16, 0 ); /* Segment length */
1484 bs_write( s, 16, i_regions ); /* Object id */
1485 bs_write( s, 4, p_sys->i_region_ver++ );
1486 bs_write( s, 2, 0 ); /* object coding method */
1488 bs_write( s, 1, 0 ); /* non modifying color flag */
1489 bs_write( s, 1, 0 ); /* Reserved */
1491 i_update_pos = bs_pos( s );
1492 bs_write( s, 16, 0 ); /* topfield data block length */
1493 bs_write( s, 16, 0 ); /* bottomfield data block length */
1496 i_pixel_data_pos = bs_pos( s );
1497 encode_pixel_data( p_enc, s, p_region, VLC_TRUE );
1498 i_pixel_data_pos = ( bs_pos( s ) - i_pixel_data_pos ) / 8;
1499 SetWBE( &s->p_start[i_update_pos/8], i_pixel_data_pos );
1502 i_pixel_data_pos = bs_pos( s );
1503 encode_pixel_data( p_enc, s, p_region, VLC_FALSE );
1504 i_pixel_data_pos = ( bs_pos( s ) - i_pixel_data_pos ) / 8;
1505 SetWBE( &s->p_start[i_update_pos/8+2], i_pixel_data_pos );
1507 /* Stuffing for word alignment */
1509 if( bs_pos( s ) % 16 ) bs_write( s, 8, 0 );
1511 /* Update segment length */
1512 SetWBE( &s->p_start[i_length_pos/8], (bs_pos(s) - i_length_pos)/8 -2 );
1516 static void encode_pixel_line_2bp( encoder_t *p_enc, bs_t *s,
1517 subpicture_region_t *p_region,
1519 static void encode_pixel_line_4bp( encoder_t *p_enc, bs_t *s,
1520 subpicture_region_t *p_region,
1522 static void encode_pixel_data( encoder_t *p_enc, bs_t *s,
1523 subpicture_region_t *p_region,
1526 unsigned int i_line;
1529 if( p_region->fmt.i_chroma != VLC_FOURCC('Y','U','V','P') ) return;
1531 /* Encode line by line */
1532 for( i_line = !b_top; i_line < p_region->fmt.i_visible_height;
1535 switch( p_region->fmt.p_palette->i_entries )
1538 bs_write( s, 8, 0x10 ); /* 2 bit/pixel code string */
1539 encode_pixel_line_2bp( p_enc, s, p_region, i_line );
1543 bs_write( s, 8, 0x11 ); /* 4 bit/pixel code string */
1544 encode_pixel_line_4bp( p_enc, s, p_region, i_line );
1548 msg_Err( p_enc, "subpicture palette (%i) not handled",
1549 p_region->fmt.p_palette->i_entries );
1553 bs_write( s, 8, 0xf0 ); /* End of object line code */
1557 static void encode_pixel_line_2bp( encoder_t *p_enc, bs_t *s,
1558 subpicture_region_t *p_region,
1561 unsigned int i, i_length = 0;
1562 int i_pitch = p_region->picture.p->i_pitch;
1563 uint8_t *p_data = &p_region->picture.p->p_pixels[ i_pitch * i_line ];
1564 int i_last_pixel = p_data[0];
1566 for( i = 0; i <= p_region->fmt.i_visible_width; i++ )
1568 if( i != p_region->fmt.i_visible_width &&
1569 p_data[i] == i_last_pixel && i_length != 284 )
1575 if( i_length == 1 || i_length == 11 || i_length == 28 )
1577 /* 2bit/pixel code */
1578 if( i_last_pixel ) bs_write( s, 2, i_last_pixel );
1581 bs_write( s, 2, 0 );
1582 bs_write( s, 1, 0 );
1583 bs_write( s, 1, 1 ); /* pseudo color 0 */
1592 bs_write( s, 2, i_last_pixel );
1593 bs_write( s, 2, i_last_pixel );
1597 bs_write( s, 2, 0 );
1598 bs_write( s, 1, 0 );
1599 bs_write( s, 1, 0 );
1600 bs_write( s, 2, 1 ); /* 2 * pseudo color 0 */
1603 else if( i_length > 2 )
1605 bs_write( s, 2, 0 );
1606 if( i_length <= 10 )
1608 bs_write( s, 1, 1 );
1609 bs_write( s, 3, i_length - 3 );
1610 bs_write( s, 2, i_last_pixel );
1614 bs_write( s, 1, 0 );
1615 bs_write( s, 1, 0 );
1617 if( i_length <= 27 )
1619 bs_write( s, 2, 2 );
1620 bs_write( s, 4, i_length - 12 );
1621 bs_write( s, 2, i_last_pixel );
1625 bs_write( s, 2, 3 );
1626 bs_write( s, 8, i_length - 29 );
1627 bs_write( s, 2, i_last_pixel );
1632 if( i == p_region->fmt.i_visible_width ) break;
1634 i_last_pixel = p_data[i];
1639 bs_write( s, 2, 0 );
1640 bs_write( s, 1, 0 );
1641 bs_write( s, 1, 0 );
1642 bs_write( s, 2, 0 );
1648 static void encode_pixel_line_4bp( encoder_t *p_enc, bs_t *s,
1649 subpicture_region_t *p_region,
1652 unsigned int i, i_length = 0;
1653 int i_pitch = p_region->picture.p->i_pitch;
1654 uint8_t *p_data = &p_region->picture.p->p_pixels[ i_pitch * i_line ];
1655 int i_last_pixel = p_data[0];
1657 for( i = 0; i <= p_region->fmt.i_visible_width; i++ )
1659 if( i != p_region->fmt.i_visible_width &&
1660 p_data[i] == i_last_pixel && i_length != 1 )
1668 /* 4bit/pixel code */
1669 if( i_last_pixel ) bs_write( s, 4, i_last_pixel );
1672 bs_write( s, 4, 0 );
1673 bs_write( s, 1, 1 );
1674 bs_write( s, 1, 1 );
1675 bs_write( s, 2, 0 ); /* pseudo color 0 */
1679 if( i == p_region->fmt.i_visible_width ) break;
1681 i_last_pixel = p_data[i];
1686 bs_write( s, 8, 0 );