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, *p_next;
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 /* Initialize to default clut */
507 p_next = p_clut->p_next;
508 *p_clut = p_sys->default_clut;
509 p_clut->p_next = p_next;
511 /* We don't have this version of the CLUT: Parse it */
512 p_clut->i_version = i_version;
514 bs_skip( s, 4 ); /* Reserved bits */
515 i_processed_length = 2;
516 while( i_processed_length < i_segment_length )
518 uint8_t y, cb, cr, t;
522 i_id = bs_read( s, 8 );
523 i_type = bs_read( s, 3 );
527 if( bs_read( s, 1 ) )
530 cr = bs_read( s, 8 );
531 cb = bs_read( s, 8 );
533 i_processed_length += 6;
537 y = bs_read( s, 6 ) << 2;
538 cr = bs_read( s, 4 ) << 4;
539 cb = bs_read( s, 4 ) << 4;
540 t = bs_read( s, 2 ) << 6;
541 i_processed_length += 4;
544 /* We are not entirely compliant here as full transparency is indicated
545 * with a luma value of zero, not a transparency value of 0xff
546 * (full transparency would actually be 0xff + 1). */
554 /* According to EN 300-743 section 7.2.3 note 1, type should
555 * not have more than 1 bit set to one, but some streams don't
556 * respect this note. */
558 if( i_type & 0x04 && i_id < 4 )
560 p_clut->c_2b[i_id].Y = y;
561 p_clut->c_2b[i_id].Cr = cr;
562 p_clut->c_2b[i_id].Cb = cb;
563 p_clut->c_2b[i_id].T = t;
565 if( i_type & 0x02 && i_id < 16 )
567 p_clut->c_4b[i_id].Y = y;
568 p_clut->c_4b[i_id].Cr = cr;
569 p_clut->c_4b[i_id].Cb = cb;
570 p_clut->c_4b[i_id].T = t;
574 p_clut->c_8b[i_id].Y = y;
575 p_clut->c_8b[i_id].Cr = cr;
576 p_clut->c_8b[i_id].Cb = cb;
577 p_clut->c_8b[i_id].T = t;
582 static void decode_page_composition( decoder_t *p_dec, bs_t *s )
584 decoder_sys_t *p_sys = p_dec->p_sys;
585 int i_version, i_state, i_segment_length, i_timeout, i;
587 /* A page is composed by 0 or more region */
589 i_segment_length = bs_read( s, 16 );
590 i_timeout = bs_read( s, 8 );
591 i_version = bs_read( s, 4 );
592 i_state = bs_read( s, 2 );
593 bs_skip( s, 2 ); /* Reserved */
595 if( i_state == DVBSUB_PCS_STATE_CHANGE )
597 /* End of an epoch, reset decoder buffer */
599 msg_Dbg( p_dec, "page composition mode change" );
603 else if( !p_sys->p_page && i_state != DVBSUB_PCS_STATE_ACQUISITION &&
604 i_state != DVBSUB_PCS_STATE_CHANGE )
606 /* Not a full PCS, we need to wait for one */
607 msg_Dbg( p_dec, "didn't receive an acquisition page yet" );
609 #if 0 /* Try to start decoding even without an acquisition page */
610 bs_skip( s, 8 * (i_segment_length - 2) );
616 if( i_state == DVBSUB_PCS_STATE_ACQUISITION )
617 msg_Dbg( p_dec, "acquisition page composition" );
620 /* Check version number */
621 if( p_sys->p_page && p_sys->p_page->i_version == i_version )
623 bs_skip( s, 8 * (i_segment_length - 2) );
626 else if( p_sys->p_page )
628 if( p_sys->p_page->i_region_defs )
629 free( p_sys->p_page->p_region_defs );
630 p_sys->p_page->i_region_defs = 0;
636 msg_Dbg( p_dec, "new page" );
638 /* Allocate a new page */
639 p_sys->p_page = malloc( sizeof(dvbsub_page_t) );
642 p_sys->p_page->i_version = i_version;
643 p_sys->p_page->i_timeout = i_timeout;
645 /* Number of regions */
646 p_sys->p_page->i_region_defs = (i_segment_length - 2) / 6;
648 if( p_sys->p_page->i_region_defs == 0 ) return;
650 p_sys->p_page->p_region_defs =
651 malloc( p_sys->p_page->i_region_defs * sizeof(dvbsub_region_t) );
652 for( i = 0; i < p_sys->p_page->i_region_defs; i++ )
654 p_sys->p_page->p_region_defs[i].i_id = bs_read( s, 8 );
655 bs_skip( s, 8 ); /* Reserved */
656 p_sys->p_page->p_region_defs[i].i_x = bs_read( s, 16 );
657 p_sys->p_page->p_region_defs[i].i_y = bs_read( s, 16 );
660 msg_Dbg( p_dec, "page_composition, region %i (%i,%i)",
661 i, p_sys->p_page->p_region_defs[i].i_x,
662 p_sys->p_page->p_region_defs[i].i_y );
667 static void decode_region_composition( decoder_t *p_dec, bs_t *s )
669 decoder_sys_t *p_sys = p_dec->p_sys;
670 dvbsub_region_t *p_region, **pp_region = &p_sys->p_regions;
671 int i_segment_length, i_processed_length, i_id, i_version;
672 int i_width, i_height, i_level_comp, i_depth, i_clut;
673 int i_8_bg, i_4_bg, i_2_bg;
676 i_segment_length = bs_read( s, 16 );
677 i_id = bs_read( s, 8 );
678 i_version = bs_read( s, 4 );
680 /* Check if we already have this region */
681 for( p_region = p_sys->p_regions; p_region != NULL;
682 p_region = p_region->p_next )
684 pp_region = &p_region->p_next;
685 if( p_region->i_id == i_id ) break;
688 /* Check version number */
689 if( p_region && p_region->i_version == i_version )
691 bs_skip( s, 8 * (i_segment_length - 1) - 4 );
698 msg_Dbg( p_dec, "new region: %i", i_id );
700 p_region = *pp_region = malloc( sizeof(dvbsub_region_t) );
701 memset( p_region, 0, sizeof(dvbsub_region_t) );
702 p_region->p_object_defs = NULL;
703 p_region->p_pixbuf = NULL;
704 p_region->p_next = NULL;
707 /* Region attributes */
708 p_region->i_id = i_id;
709 p_region->i_version = i_version;
710 b_fill = bs_read( s, 1 );
711 bs_skip( s, 3 ); /* Reserved */
713 i_width = bs_read( s, 16 );
714 i_height = bs_read( s, 16 );
715 i_level_comp = bs_read( s, 3 );
716 i_depth = bs_read( s, 3 );
717 bs_skip( s, 2 ); /* Reserved */
718 i_clut = bs_read( s, 8 );
720 i_8_bg = bs_read( s, 8 );
721 i_4_bg = bs_read( s, 4 );
722 i_2_bg = bs_read( s, 2 );
723 bs_skip( s, 2 ); /* Reserved */
724 p_region->i_object_defs = 0;
726 /* Extra sanity checks */
727 if( p_region->i_width != i_width || p_region->i_height != i_height )
729 if( p_region->p_pixbuf )
731 msg_Dbg( p_dec, "region size changed (not allowed)" );
732 free( p_region->p_pixbuf );
735 p_region->p_pixbuf = malloc( i_height * i_width );
736 p_region->i_depth = 0;
739 if( p_region->i_depth && (p_region->i_depth != i_depth ||
740 p_region->i_level_comp != i_level_comp || p_region->i_clut != i_clut) )
742 msg_Dbg( p_dec, "region parameters changed (not allowed)" );
745 /* Erase background of region */
748 int i_background = (p_region->i_depth == 1) ? i_2_bg :
749 (p_region->i_depth == 2) ? i_4_bg : i_8_bg;
750 memset( p_region->p_pixbuf, i_background, i_width * i_height );
753 p_region->i_width = i_width;
754 p_region->i_height = i_height;
755 p_region->i_level_comp = i_level_comp;
756 p_region->i_depth = i_depth;
757 p_region->i_clut = i_clut;
759 /* List of objects in the region */
760 i_processed_length = 10;
761 while( i_processed_length < i_segment_length )
763 dvbsub_objectdef_t *p_obj;
765 /* We create a new object */
766 p_region->i_object_defs++;
767 p_region->p_object_defs =
768 realloc( p_region->p_object_defs,
769 sizeof(dvbsub_objectdef_t) * p_region->i_object_defs );
771 /* We parse object properties */
772 p_obj = &p_region->p_object_defs[p_region->i_object_defs - 1];
773 p_obj->i_id = bs_read( s, 16 );
774 p_obj->i_type = bs_read( s, 2 );
775 bs_skip( s, 2 ); /* Provider */
776 p_obj->i_x = bs_read( s, 12 );
777 bs_skip( s, 4 ); /* Reserved */
778 p_obj->i_y = bs_read( s, 12 );
780 i_processed_length += 6;
782 if( p_obj->i_type == DVBSUB_OT_BASIC_CHAR ||
783 p_obj->i_type == DVBSUB_OT_COMPOSITE_STRING )
785 p_obj->i_fg_pc = bs_read( s, 8 );
786 p_obj->i_bg_pc = bs_read( s, 8 );
787 i_processed_length += 2;
792 static void dvbsub_render_pdata( decoder_t *, dvbsub_region_t *, int, int,
794 static void dvbsub_pdata2bpp( bs_t *, uint8_t *, int, int * );
795 static void dvbsub_pdata4bpp( bs_t *, uint8_t *, int, int * );
796 static void dvbsub_pdata8bpp( bs_t *, uint8_t *, int, int * );
798 static void decode_object( decoder_t *p_dec, bs_t *s )
800 decoder_sys_t *p_sys = p_dec->p_sys;
801 dvbsub_region_t *p_region;
802 int i_segment_length, i_coding_method, i_version, i_id, i;
803 vlc_bool_t b_non_modify_color;
805 i_segment_length = bs_read( s, 16 );
806 i_id = bs_read( s, 16 );
807 i_version = bs_read( s, 4 );
808 i_coding_method = bs_read( s, 2 );
810 if( i_coding_method )
812 /* TODO: DVB subtitling as characters */
813 msg_Dbg( p_dec, "DVB subtitling as characters is not handled!" );
814 bs_skip( s, 8 * (i_segment_length - 2) - 6 );
818 /* Check if the object needs to be rendered in at least one
820 for( p_region = p_sys->p_regions; p_region != NULL;
821 p_region = p_region->p_next )
823 for( i = 0; i < p_region->i_object_defs; i++ )
824 if( p_region->p_object_defs[i].i_id == i_id ) break;
826 if( i != p_region->i_object_defs ) break;
830 bs_skip( s, 8 * (i_segment_length - 2) - 6 );
835 msg_Dbg( p_dec, "new object: %i", i_id );
838 b_non_modify_color = bs_read( s, 1 );
839 bs_skip( s, 1 ); /* Reserved */
841 if( i_coding_method == 0x00 )
843 int i_topfield, i_bottomfield;
844 uint8_t *p_topfield, *p_bottomfield;
846 i_topfield = bs_read( s, 16 );
847 i_bottomfield = bs_read( s, 16 );
848 p_topfield = s->p_start + bs_pos( s ) / 8;
849 p_bottomfield = p_topfield + i_topfield;
851 bs_skip( s, 8 * (i_segment_length - 7) );
854 if( i_segment_length < i_topfield + i_bottomfield + 7 ||
855 p_topfield + i_topfield + i_bottomfield > s->p_end )
857 msg_Dbg( p_dec, "corrupted object data" );
861 for( p_region = p_sys->p_regions; p_region != NULL;
862 p_region = p_region->p_next )
864 for( i = 0; i < p_region->i_object_defs; i++ )
866 if( p_region->p_object_defs[i].i_id != i_id ) continue;
868 dvbsub_render_pdata( p_dec, p_region,
869 p_region->p_object_defs[i].i_x,
870 p_region->p_object_defs[i].i_y,
871 p_topfield, i_topfield );
875 dvbsub_render_pdata( p_dec, p_region,
876 p_region->p_object_defs[i].i_x,
877 p_region->p_object_defs[i].i_y + 1,
878 p_bottomfield, i_bottomfield );
882 /* Duplicate the top field */
883 dvbsub_render_pdata( p_dec, p_region,
884 p_region->p_object_defs[i].i_x,
885 p_region->p_object_defs[i].i_y + 1,
886 p_topfield, i_topfield );
893 /* TODO: DVB subtitling as characters */
897 msg_Dbg( p_dec, "end object: %i", i_id );
901 static void dvbsub_render_pdata( decoder_t *p_dec, dvbsub_region_t *p_region,
903 uint8_t *p_field, int i_field )
910 if( !p_region->p_pixbuf )
912 msg_Err( p_dec, "region %i has no pixel buffer!", p_region->i_id );
915 if( i_y < 0 || i_x < 0 || i_y >= p_region->i_height ||
916 i_x >= p_region->i_width )
918 msg_Dbg( p_dec, "invalid offset (%i,%i)", i_x, i_y );
922 p_pixbuf = p_region->p_pixbuf + i_y * p_region->i_width;
923 bs_init( &bs, p_field, i_field );
925 while( !bs_eof( &bs ) )
928 if( i_y >= p_region->i_height ) return;
930 switch( bs_read( &bs, 8 ) )
933 dvbsub_pdata2bpp( &bs, p_pixbuf + i_x, p_region->i_width - i_x,
938 dvbsub_pdata4bpp( &bs, p_pixbuf + i_x, p_region->i_width - i_x,
943 dvbsub_pdata8bpp( &bs, p_pixbuf + i_x, p_region->i_width - i_x,
950 /* We don't use map tables */
953 case 0xf0: /* End of line code */
954 p_pixbuf += 2*p_region->i_width;
955 i_offset = 0; i_y += 2;
961 static void dvbsub_pdata2bpp( bs_t *s, uint8_t *p, int i_width, int *pi_off )
963 vlc_bool_t b_stop = 0;
965 while( !b_stop && !bs_eof( s ) )
967 int i_count = 0, i_color = 0;
969 if( (i_color = bs_read( s, 2 )) != 0x00 )
975 if( bs_read( s, 1 ) == 0x01 ) // Switch1
977 i_count = 3 + bs_read( s, 3 );
978 i_color = bs_read( s, 2 );
982 if( bs_read( s, 1 ) == 0x00 ) //Switch2
984 switch( bs_read( s, 2 ) ) //Switch3
993 i_count = 12 + bs_read( s, 4 );
994 i_color = bs_read( s, 2 );
997 i_count = 29 + bs_read( s, 8 );
998 i_color = bs_read( s, 2 );
1006 /* 1 pixel color 0 */
1012 if( !i_count ) continue;
1015 if( i_count + *pi_off > i_width ) break;
1017 if( i_count == 1 ) p[*pi_off] = i_color;
1018 else memset( p + *pi_off, i_color, i_count );
1020 (*pi_off) += i_count;
1026 static void dvbsub_pdata4bpp( bs_t *s, uint8_t *p, int i_width, int *pi_off )
1028 vlc_bool_t b_stop = 0;
1030 while( !b_stop && !bs_eof( s ) )
1032 int i_count = 0, i_color = 0;
1034 if( (i_color = bs_read( s, 4 )) != 0x00 )
1041 if( bs_read( s, 1 ) == 0x00 ) // Switch1
1043 if( bs_show( s, 3 ) != 0x00 )
1045 i_count = 2 + bs_read( s, 3 );
1055 if( bs_read( s, 1 ) == 0x00) //Switch2
1057 i_count = 4 + bs_read( s, 2 );
1058 i_color = bs_read( s, 4 );
1062 switch ( bs_read( s, 2 ) ) //Switch3
1071 i_count = 9 + bs_read( s, 4 );
1072 i_color = bs_read( s, 4 );
1075 i_count= 25 + bs_read( s, 8 );
1076 i_color = bs_read( s, 4 );
1083 if( !i_count ) continue;
1086 if( i_count + *pi_off > i_width ) break;
1088 if( i_count == 1 ) p[*pi_off] = i_color;
1089 else memset( p + *pi_off, i_color, i_count );
1091 (*pi_off) += i_count;
1097 static void dvbsub_pdata8bpp( bs_t *s, uint8_t *p, int i_width, int *pi_off )
1099 vlc_bool_t b_stop = 0;
1101 while( !b_stop && !bs_eof( s ) )
1103 int i_count = 0, i_color = 0;
1105 if( (i_color = bs_read( s, 8 )) != 0x00 )
1112 if( bs_read( s, 1 ) == 0x00 ) // Switch1
1114 if( bs_show( s, 7 ) != 0x00 )
1116 i_count = bs_read( s, 7 );
1126 i_count = bs_read( s, 7 );
1127 i_color = bs_read( s, 8 );
1131 if( !i_count ) continue;
1134 if( i_count + *pi_off > i_width ) break;
1136 if( i_count == 1 ) p[*pi_off] = i_color;
1137 else memset( p + *pi_off, i_color, i_count );
1139 (*pi_off) += i_count;
1145 static void free_all( decoder_t *p_dec )
1147 decoder_sys_t *p_sys = p_dec->p_sys;
1148 dvbsub_region_t *p_reg, *p_reg_next;
1149 dvbsub_clut_t *p_clut, *p_clut_next;
1151 for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut_next )
1153 p_clut_next = p_clut->p_next;
1156 p_sys->p_cluts = NULL;
1158 for( p_reg = p_sys->p_regions; p_reg != NULL; p_reg = p_reg_next )
1160 p_reg_next = p_reg->p_next;
1161 if( p_reg->i_object_defs ) free( p_reg->p_object_defs );
1162 if( p_reg->p_pixbuf ) free( p_reg->p_pixbuf );
1165 p_sys->p_regions = NULL;
1169 if( p_sys->p_page->i_region_defs )
1170 free( p_sys->p_page->p_region_defs );
1171 free( p_sys->p_page );
1173 p_sys->p_page = NULL;
1176 static subpicture_t *render( decoder_t *p_dec )
1178 decoder_sys_t *p_sys = p_dec->p_sys;
1179 subpicture_t *p_spu;
1180 subpicture_region_t **pp_spu_region;
1181 int i, j, i_timeout = 0;
1183 /* Allocate the subpicture internal data. */
1184 p_spu = p_dec->pf_spu_buffer_new( p_dec );
1185 if( !p_spu ) return NULL;
1187 pp_spu_region = &p_spu->p_region;
1189 /* Loop on region definitions */
1192 msg_Dbg( p_dec, "rendering %i regions", p_sys->p_page->i_region_defs );
1195 for( i = 0; p_sys->p_page && i < p_sys->p_page->i_region_defs; i++ )
1197 dvbsub_region_t *p_region;
1198 dvbsub_regiondef_t *p_regiondef;
1199 dvbsub_clut_t *p_clut;
1200 dvbsub_color_t *p_color;
1201 subpicture_region_t *p_spu_region;
1202 uint8_t *p_src, *p_dst;
1206 i_timeout = p_sys->p_page->i_timeout;
1208 p_regiondef = &p_sys->p_page->p_region_defs[i];
1211 msg_Dbg( p_dec, "rendering region %i (%i,%i)", i,
1212 p_regiondef->i_x, p_regiondef->i_y );
1215 /* Find associated region */
1216 for( p_region = p_sys->p_regions; p_region != NULL;
1217 p_region = p_region->p_next )
1219 if( p_regiondef->i_id == p_region->i_id ) break;
1224 msg_Dbg( p_dec, "region %i not found", p_regiondef->i_id );
1228 /* Find associated CLUT */
1229 for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut->p_next )
1231 if( p_region->i_clut == p_clut->i_id ) break;
1235 msg_Dbg( p_dec, "clut %i not found", p_region->i_clut );
1239 /* Create new SPU region */
1240 memset( &fmt, 0, sizeof(video_format_t) );
1241 fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
1242 fmt.i_aspect = VOUT_ASPECT_FACTOR;
1243 fmt.i_width = fmt.i_visible_width = p_region->i_width;
1244 fmt.i_height = fmt.i_visible_height = p_region->i_height;
1245 fmt.i_x_offset = fmt.i_y_offset = 0;
1246 p_spu_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
1249 msg_Err( p_dec, "cannot allocate SPU region" );
1252 p_spu_region->i_x = p_regiondef->i_x;
1253 p_spu_region->i_y = p_regiondef->i_y;
1254 *pp_spu_region = p_spu_region;
1255 pp_spu_region = &p_spu_region->p_next;
1258 fmt.p_palette->i_entries = p_region->i_depth == 1 ? 4 :
1259 p_region->i_depth == 2 ? 16 : 256;
1260 p_color = (p_region->i_depth == 1) ? p_clut->c_2b :
1261 (p_region->i_depth == 2) ? p_clut->c_4b : p_clut->c_8b;
1262 for( j = 0; j < fmt.p_palette->i_entries; j++ )
1264 fmt.p_palette->palette[j][0] = p_color[j].Y;
1265 fmt.p_palette->palette[j][1] = p_color[j].Cr;
1266 fmt.p_palette->palette[j][2] = p_color[j].Cb;
1267 fmt.p_palette->palette[j][3] = 0xff - p_color[j].T;
1270 p_src = p_region->p_pixbuf;
1271 p_dst = p_spu_region->picture.Y_PIXELS;
1272 i_pitch = p_spu_region->picture.Y_PITCH;
1274 /* Copy pixel buffer */
1275 for( j = 0; j < p_region->i_height; j++ )
1277 memcpy( p_dst, p_src, p_region->i_width );
1278 p_src += p_region->i_width;
1283 /* Set the pf_render callback */
1284 p_spu->i_start = p_sys->i_pts;
1285 p_spu->i_stop = p_spu->i_start + i_timeout * 1000000;
1286 p_spu->b_ephemer = VLC_TRUE;
1291 /*****************************************************************************
1292 * encoder_sys_t : encoder descriptor
1293 *****************************************************************************/
1294 typedef struct encoder_region_t
1301 struct encoder_sys_t
1303 unsigned int i_page_ver;
1304 unsigned int i_region_ver;
1305 unsigned int i_clut_ver;
1308 encoder_region_t *p_regions;
1313 static void encode_page_composition( encoder_t *, bs_t *, subpicture_t * );
1314 static void encode_clut( encoder_t *, bs_t *, subpicture_t * );
1315 static void encode_region_composition( encoder_t *, bs_t *, subpicture_t * );
1316 static void encode_object( encoder_t *, bs_t *, subpicture_t * );
1318 /*****************************************************************************
1319 * OpenEncoder: probe the encoder and return score
1320 *****************************************************************************/
1321 static int OpenEncoder( vlc_object_t *p_this )
1323 encoder_t *p_enc = (encoder_t *)p_this;
1324 encoder_sys_t *p_sys;
1326 if( p_enc->fmt_out.i_codec != VLC_FOURCC('d','v','b','s') &&
1329 return VLC_EGENERIC;
1332 /* Allocate the memory needed to store the decoder's structure */
1333 if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
1335 msg_Err( p_enc, "out of memory" );
1336 return VLC_EGENERIC;
1338 p_enc->p_sys = p_sys;
1340 p_enc->pf_encode_sub = Encode;
1341 p_enc->fmt_out.i_codec = VLC_FOURCC('d','v','b','s');
1342 p_enc->fmt_out.subs.dvb.i_id = 1 << 16 | 1;
1344 sout_CfgParse( p_enc, ENC_CFG_PREFIX, ppsz_enc_options, p_enc->p_cfg );
1346 p_sys->i_page_ver = 0;
1347 p_sys->i_region_ver = 0;
1348 p_sys->i_clut_ver = 0;
1349 p_sys->i_regions = 0;
1350 p_sys->p_regions = 0;
1355 /****************************************************************************
1356 * Encode: the whole thing
1357 ****************************************************************************/
1358 static block_t *Encode( encoder_t *p_enc, subpicture_t *p_subpic )
1360 bs_t bits, *s = &bits;
1363 if( !p_subpic || !p_subpic->p_region ) return 0;
1365 msg_Dbg( p_enc, "encoding subpicture" );
1367 p_block = block_New( p_enc, 64000 );
1368 bs_init( s, p_block->p_buffer, p_block->i_buffer );
1370 bs_write( s, 8, 0x20 ); /* Data identifier */
1371 bs_write( s, 8, 0x0 ); /* Subtitle stream id */
1373 encode_page_composition( p_enc, s, p_subpic );
1374 encode_region_composition( p_enc, s, p_subpic );
1375 encode_clut( p_enc, s, p_subpic );
1376 encode_object( p_enc, s, p_subpic );
1378 /* End of display */
1379 bs_write( s, 8, 0x0f ); /* Sync byte */
1380 bs_write( s, 8, DVBSUB_ST_ENDOFDISPLAY ); /* Segment type */
1381 bs_write( s, 16, 1 ); /* Page id */
1382 bs_write( s, 16, 0 ); /* Segment length */
1384 bs_write( s, 8, 0xff ); /* End marker */
1385 p_block->i_buffer = bs_pos( s ) / 8;
1386 p_block->i_pts = p_block->i_dts = p_subpic->i_start;
1387 if( !p_subpic->b_ephemer && p_subpic->i_stop > p_subpic->i_start )
1389 block_t *p_block_stop;
1391 p_block->i_length = p_subpic->i_stop - p_subpic->i_start;
1393 /* Send another (empty) subtitle to signal the end of display */
1394 p_block_stop = block_New( p_enc, 64000 );
1395 bs_init( s, p_block_stop->p_buffer, p_block_stop->i_buffer );
1396 bs_write( s, 8, 0x20 ); /* Data identifier */
1397 bs_write( s, 8, 0x0 ); /* Subtitle stream id */
1398 encode_page_composition( p_enc, s, 0 );
1399 bs_write( s, 8, 0x0f ); /* Sync byte */
1400 bs_write( s, 8, DVBSUB_ST_ENDOFDISPLAY ); /* Segment type */
1401 bs_write( s, 16, 1 ); /* Page id */
1402 bs_write( s, 16, 0 ); /* Segment length */
1403 bs_write( s, 8, 0xff ); /* End marker */
1404 p_block_stop->i_buffer = bs_pos( s ) / 8;
1405 p_block_stop->i_pts = p_block_stop->i_dts = p_subpic->i_stop;
1406 block_ChainAppend( &p_block, p_block_stop );
1407 p_block_stop->i_length = 100000;//p_subpic->i_stop - p_subpic->i_start;
1410 msg_Dbg( p_enc, "subpicture encoded properly" );
1415 /*****************************************************************************
1416 * CloseEncoder: encoder destruction
1417 *****************************************************************************/
1418 static void CloseEncoder( vlc_object_t *p_this )
1420 encoder_t *p_enc = (encoder_t *)p_this;
1421 encoder_sys_t *p_sys = p_enc->p_sys;
1423 if( p_sys->i_regions ) free( p_sys->p_regions );
1427 static void encode_page_composition( encoder_t *p_enc, bs_t *s,
1428 subpicture_t *p_subpic )
1430 encoder_sys_t *p_sys = p_enc->p_sys;
1431 subpicture_region_t *p_region;
1432 vlc_bool_t b_mode_change = VLC_FALSE;
1433 int i_regions, i_timeout;
1435 bs_write( s, 8, 0x0f ); /* Sync byte */
1436 bs_write( s, 8, DVBSUB_ST_PAGE_COMPOSITION ); /* Segment type */
1437 bs_write( s, 16, 1 ); /* Page id */
1439 for( i_regions = 0, p_region = p_subpic ? p_subpic->p_region : 0;
1440 p_region; p_region = p_region->p_next, i_regions++ )
1442 if( i_regions >= p_sys->i_regions )
1444 encoder_region_t region;
1445 region.i_width = region.i_height = 0;
1447 realloc( p_sys->p_regions, sizeof(encoder_region_t) *
1448 (p_sys->i_regions + 1) );
1449 p_sys->p_regions[p_sys->i_regions++] = region;
1452 if( p_sys->p_regions[i_regions].i_width <
1453 (int)p_region->fmt.i_visible_width )
1455 b_mode_change = VLC_TRUE;
1456 msg_Dbg( p_enc, "region %i width change: %i -> %i",
1457 i_regions, p_sys->p_regions[i_regions].i_width,
1458 p_region->fmt.i_visible_width );
1459 p_sys->p_regions[i_regions].i_width =
1460 p_region->fmt.i_visible_width;
1462 if( p_sys->p_regions[i_regions].i_height <
1463 (int)p_region->fmt.i_visible_height )
1465 b_mode_change = VLC_TRUE;
1466 msg_Dbg( p_enc, "region %i height change: %i -> %i",
1467 i_regions, p_sys->p_regions[i_regions].i_height,
1468 p_region->fmt.i_visible_height );
1469 p_sys->p_regions[i_regions].i_height =
1470 p_region->fmt.i_visible_height;
1474 bs_write( s, 16, i_regions * 6 + 2 ); /* Segment length */
1477 if( p_subpic && !p_subpic->b_ephemer &&
1478 p_subpic->i_stop > p_subpic->i_start )
1480 i_timeout = (p_subpic->i_stop - p_subpic->i_start) / 1000000;
1483 bs_write( s, 8, i_timeout + 15 ); /* Timeout */
1484 bs_write( s, 4, p_sys->i_page_ver++ );
1485 bs_write( s, 2, b_mode_change ?
1486 DVBSUB_PCS_STATE_CHANGE : DVBSUB_PCS_STATE_ACQUISITION );
1487 bs_write( s, 2, 0 ); /* Reserved */
1489 for( i_regions = 0, p_region = p_subpic ? p_subpic->p_region : 0;
1490 p_region; p_region = p_region->p_next, i_regions++ )
1492 bs_write( s, 8, i_regions );
1493 bs_write( s, 8, 0 ); /* Reserved */
1494 bs_write( s, 16, p_region->i_x );
1495 bs_write( s, 16, p_region->i_y );
1499 static void encode_clut( encoder_t *p_enc, bs_t *s, subpicture_t *p_subpic )
1501 encoder_sys_t *p_sys = p_enc->p_sys;
1502 subpicture_region_t *p_region = p_subpic->p_region;
1503 video_palette_t *p_pal;
1507 if( !p_region || !p_region->fmt.p_palette ||
1508 p_region->fmt.i_chroma != VLC_FOURCC('Y','U','V','P') ) return;
1510 bs_write( s, 8, 0x0f ); /* Sync byte */
1511 bs_write( s, 8, DVBSUB_ST_CLUT_DEFINITION ); /* Segment type */
1512 bs_write( s, 16, 1 ); /* Page id */
1514 p_pal = p_region->fmt.p_palette;
1516 bs_write( s, 16, p_pal->i_entries * 6 + 2 ); /* Segment length */
1517 bs_write( s, 8, 1 ); /* Clut id */
1518 bs_write( s, 4, p_sys->i_clut_ver++ );
1519 bs_write( s, 4, 0 ); /* Reserved */
1521 for( i = 0; i < p_pal->i_entries; i++ )
1523 bs_write( s, 8, i ); /* Clut entry id */
1524 bs_write( s, 1, p_pal->i_entries == 4 ); /* 2bit/entry flag */
1525 bs_write( s, 1, p_pal->i_entries == 16 ); /* 4bit/entry flag */
1526 bs_write( s, 1, p_pal->i_entries == 256 ); /* 8bit/entry flag */
1527 bs_write( s, 4, 0 ); /* Reserved */
1528 bs_write( s, 1, 1 ); /* Full range flag */
1529 bs_write( s, 8, p_pal->palette[i][3] ? /* Y value */
1530 (p_pal->palette[i][0] ? p_pal->palette[i][0] : 16) : 0 );
1531 bs_write( s, 8, p_pal->palette[i][1] ); /* Cr value */
1532 bs_write( s, 8, p_pal->palette[i][2] ); /* Cb value */
1533 bs_write( s, 8, 0xff - p_pal->palette[i][3] ); /* T value */
1537 static void encode_region_composition( encoder_t *p_enc, bs_t *s,
1538 subpicture_t *p_subpic )
1540 encoder_sys_t *p_sys = p_enc->p_sys;
1541 subpicture_region_t *p_region;
1544 for( i_region = 0, p_region = p_subpic->p_region; p_region;
1545 p_region = p_region->p_next, i_region++ )
1547 video_palette_t *p_pal = p_region->fmt.p_palette;
1548 int i_depth = p_pal->i_entries == 4 ? 0x1 :
1549 p_pal->i_entries == 16 ? 0x2 : 0x3;
1551 for( i_bg = 0; i_bg < p_pal->i_entries; i_bg++ )
1553 if( !p_pal->palette[i_bg][3] ) break;
1556 bs_write( s, 8, 0x0f ); /* Sync byte */
1557 bs_write( s, 8, DVBSUB_ST_REGION_COMPOSITION ); /* Segment type */
1558 bs_write( s, 16, 1 ); /* Page id */
1560 bs_write( s, 16, 10 + 6 ); /* Segment length */
1561 bs_write( s, 8, i_region );
1562 bs_write( s, 4, p_sys->i_region_ver++ );
1564 /* Region attributes */
1565 bs_write( s, 1, i_bg < p_pal->i_entries ); /* Fill */
1566 bs_write( s, 3, 0 ); /* Reserved */
1567 bs_write( s, 16, p_sys->p_regions[i_region].i_width );
1568 bs_write( s, 16, p_sys->p_regions[i_region].i_height );
1569 bs_write( s, 3, i_depth ); /* Region level of compatibility */
1570 bs_write( s, 3, i_depth ); /* Region depth */
1571 bs_write( s, 2, 0 ); /* Reserved */
1572 bs_write( s, 8, 1 ); /* Clut id */
1573 bs_write( s, 8, i_bg ); /* region 8bit pixel code */
1574 bs_write( s, 4, i_bg ); /* region 4bit pixel code */
1575 bs_write( s, 2, i_bg ); /* region 2bit pixel code */
1576 bs_write( s, 2, 0 ); /* Reserved */
1578 /* In our implementation we only have 1 object per region */
1579 bs_write( s, 16, i_region );
1580 bs_write( s, 2, DVBSUB_OT_BASIC_BITMAP );
1581 bs_write( s, 2, 0 ); /* object provider flag */
1582 bs_write( s, 12, 0 ); /* object horizontal position */
1583 bs_write( s, 4, 0 ); /* Reserved */
1584 bs_write( s, 12, 0 ); /* object vertical position */
1588 static void encode_pixel_data( encoder_t *p_enc, bs_t *s,
1589 subpicture_region_t *p_region,
1592 static void encode_object( encoder_t *p_enc, bs_t *s, subpicture_t *p_subpic )
1594 encoder_sys_t *p_sys = p_enc->p_sys;
1595 subpicture_region_t *p_region;
1598 int i_length_pos, i_update_pos, i_pixel_data_pos;
1600 for( i_region = 0, p_region = p_subpic->p_region; p_region;
1601 p_region = p_region->p_next, i_region++ )
1603 bs_write( s, 8, 0x0f ); /* Sync byte */
1604 bs_write( s, 8, DVBSUB_ST_OBJECT_DATA ); /* Segment type */
1605 bs_write( s, 16, 1 ); /* Page id */
1607 i_length_pos = bs_pos( s );
1608 bs_write( s, 16, 0 ); /* Segment length */
1609 bs_write( s, 16, i_region ); /* Object id */
1610 bs_write( s, 4, p_sys->i_region_ver++ );
1611 bs_write( s, 2, 0 ); /* object coding method */
1613 bs_write( s, 1, 0 ); /* non modifying color flag */
1614 bs_write( s, 1, 0 ); /* Reserved */
1616 i_update_pos = bs_pos( s );
1617 bs_write( s, 16, 0 ); /* topfield data block length */
1618 bs_write( s, 16, 0 ); /* bottomfield data block length */
1621 i_pixel_data_pos = bs_pos( s );
1622 encode_pixel_data( p_enc, s, p_region, VLC_TRUE );
1623 i_pixel_data_pos = ( bs_pos( s ) - i_pixel_data_pos ) / 8;
1624 SetWBE( &s->p_start[i_update_pos/8], i_pixel_data_pos );
1627 i_pixel_data_pos = bs_pos( s );
1628 encode_pixel_data( p_enc, s, p_region, VLC_FALSE );
1629 i_pixel_data_pos = ( bs_pos( s ) - i_pixel_data_pos ) / 8;
1630 SetWBE( &s->p_start[i_update_pos/8+2], i_pixel_data_pos );
1632 /* Stuffing for word alignment */
1634 if( bs_pos( s ) % 16 ) bs_write( s, 8, 0 );
1636 /* Update segment length */
1637 SetWBE( &s->p_start[i_length_pos/8], (bs_pos(s) - i_length_pos)/8 -2 );
1641 static void encode_pixel_line_2bp( encoder_t *p_enc, bs_t *s,
1642 subpicture_region_t *p_region,
1644 static void encode_pixel_line_4bp( encoder_t *p_enc, bs_t *s,
1645 subpicture_region_t *p_region,
1647 static void encode_pixel_data( encoder_t *p_enc, bs_t *s,
1648 subpicture_region_t *p_region,
1651 unsigned int i_line;
1654 if( p_region->fmt.i_chroma != VLC_FOURCC('Y','U','V','P') ) return;
1656 /* Encode line by line */
1657 for( i_line = !b_top; i_line < p_region->fmt.i_visible_height;
1660 switch( p_region->fmt.p_palette->i_entries )
1663 bs_write( s, 8, 0x10 ); /* 2 bit/pixel code string */
1664 encode_pixel_line_2bp( p_enc, s, p_region, i_line );
1668 bs_write( s, 8, 0x11 ); /* 4 bit/pixel code string */
1669 encode_pixel_line_4bp( p_enc, s, p_region, i_line );
1673 msg_Err( p_enc, "subpicture palette (%i) not handled",
1674 p_region->fmt.p_palette->i_entries );
1678 bs_write( s, 8, 0xf0 ); /* End of object line code */
1682 static void encode_pixel_line_2bp( encoder_t *p_enc, bs_t *s,
1683 subpicture_region_t *p_region,
1686 unsigned int i, i_length = 0;
1687 int i_pitch = p_region->picture.p->i_pitch;
1688 uint8_t *p_data = &p_region->picture.p->p_pixels[ i_pitch * i_line ];
1689 int i_last_pixel = p_data[0];
1691 for( i = 0; i <= p_region->fmt.i_visible_width; i++ )
1693 if( i != p_region->fmt.i_visible_width &&
1694 p_data[i] == i_last_pixel && i_length != 284 )
1700 if( i_length == 1 || i_length == 11 || i_length == 28 )
1702 /* 2bit/pixel code */
1703 if( i_last_pixel ) bs_write( s, 2, i_last_pixel );
1706 bs_write( s, 2, 0 );
1707 bs_write( s, 1, 0 );
1708 bs_write( s, 1, 1 ); /* pseudo color 0 */
1717 bs_write( s, 2, i_last_pixel );
1718 bs_write( s, 2, i_last_pixel );
1722 bs_write( s, 2, 0 );
1723 bs_write( s, 1, 0 );
1724 bs_write( s, 1, 0 );
1725 bs_write( s, 2, 1 ); /* 2 * pseudo color 0 */
1728 else if( i_length > 2 )
1730 bs_write( s, 2, 0 );
1731 if( i_length <= 10 )
1733 bs_write( s, 1, 1 );
1734 bs_write( s, 3, i_length - 3 );
1735 bs_write( s, 2, i_last_pixel );
1739 bs_write( s, 1, 0 );
1740 bs_write( s, 1, 0 );
1742 if( i_length <= 27 )
1744 bs_write( s, 2, 2 );
1745 bs_write( s, 4, i_length - 12 );
1746 bs_write( s, 2, i_last_pixel );
1750 bs_write( s, 2, 3 );
1751 bs_write( s, 8, i_length - 29 );
1752 bs_write( s, 2, i_last_pixel );
1757 if( i == p_region->fmt.i_visible_width ) break;
1759 i_last_pixel = p_data[i];
1764 bs_write( s, 2, 0 );
1765 bs_write( s, 1, 0 );
1766 bs_write( s, 1, 0 );
1767 bs_write( s, 2, 0 );
1773 static void encode_pixel_line_4bp( encoder_t *p_enc, bs_t *s,
1774 subpicture_region_t *p_region,
1777 unsigned int i, i_length = 0;
1778 int i_pitch = p_region->picture.p->i_pitch;
1779 uint8_t *p_data = &p_region->picture.p->p_pixels[ i_pitch * i_line ];
1780 int i_last_pixel = p_data[0];
1782 for( i = 0; i <= p_region->fmt.i_visible_width; i++ )
1784 if( i != p_region->fmt.i_visible_width &&
1785 p_data[i] == i_last_pixel && i_length != 1 )
1793 /* 4bit/pixel code */
1794 if( i_last_pixel ) bs_write( s, 4, i_last_pixel );
1797 bs_write( s, 4, 0 );
1798 bs_write( s, 1, 1 );
1799 bs_write( s, 1, 1 );
1800 bs_write( s, 2, 0 ); /* pseudo color 0 */
1804 if( i == p_region->fmt.i_visible_width ) break;
1806 i_last_pixel = p_data[i];
1811 bs_write( s, 8, 0 );