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demux: mp4: avoid audio cuts on seek
[vlc.git] / modules / codec / subsusf.c
blob7e4a66e8d6acfe3db4a18ae7444770ea0d3f3078
1 /*****************************************************************************
2 * subsusf.c : USF subtitles decoder
3 *****************************************************************************
4 * Copyright (C) 2000-2006 VLC authors and VideoLAN
5 * $Id$
6 *
7 * Authors: Bernie Purcell <bitmap@videolan.org>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
23 #ifdef HAVE_CONFIG_H
24 # include "config.h"
25 #endif
26 #include <assert.h>
27
28 #include <vlc_common.h>
29 #include <vlc_plugin.h>
30 #include <vlc_modules.h>
31 #include <vlc_codec.h>
32 #include <vlc_input.h>
33 #include <vlc_charset.h>
34 #include <vlc_image.h>
35 #include <vlc_xml.h>
36 #include <vlc_stream.h>
37
38 /*****************************************************************************
39 * Module descriptor.
40 *****************************************************************************/
41 static int OpenDecoder ( vlc_object_t * );
42 static void CloseDecoder ( vlc_object_t * );
43
44 #define FORMAT_TEXT N_("Formatted Subtitles")
45 #define FORMAT_LONGTEXT N_("Some subtitle formats allow for text formatting. " \
46 "VLC partly implements this, but you can choose to disable all formatting.")
47
48 vlc_module_begin ()
49 set_capability( "spu decoder", 40 )
50 set_shortname( N_("USFSubs"))
51 set_description( N_("USF subtitles decoder") )
52 set_callbacks( OpenDecoder, CloseDecoder )
53 set_category( CAT_INPUT )
54 set_subcategory( SUBCAT_INPUT_SCODEC )
55 add_bool( "subsdec-formatted", true, FORMAT_TEXT, FORMAT_LONGTEXT,
56 false )
57 vlc_module_end ()
58
59
60 /*****************************************************************************
61 * Local prototypes
62 *****************************************************************************/
63 enum
64 {
65 ATTRIBUTE_ALIGNMENT = (1 << 0),
66 ATTRIBUTE_X = (1 << 1),
67 ATTRIBUTE_X_PERCENT = (1 << 2),
68 ATTRIBUTE_Y = (1 << 3),
69 ATTRIBUTE_Y_PERCENT = (1 << 4),
70 };
71
72 typedef struct
73 {
74 char *psz_filename;
75 picture_t *p_pic;
76 } image_attach_t;
77
78 typedef struct
79 {
80 char * psz_stylename; /* The name of the style, no comma's allowed */
81 text_style_t * p_style;
82 int i_align;
83 int i_margin_h;
84 int i_margin_v;
85 int i_margin_percent_h;
86 int i_margin_percent_v;
87 } ssa_style_t;
88
89 struct decoder_sys_t
90 {
91 int i_original_height;
92 int i_original_width;
93 int i_align; /* Subtitles alignment on the vout */
94
95 ssa_style_t **pp_ssa_styles;
96 int i_ssa_styles;
97
98 image_attach_t **pp_images;
99 int i_images;
100 };
101
102 static int DecodeBlock ( decoder_t *, block_t * );
103 static char *CreatePlainText( char * );
104 static int ParseImageAttachments( decoder_t *p_dec );
105
106 static subpicture_t *ParseText ( decoder_t *, block_t * );
107 static void ParseUSFHeader( decoder_t * );
108 static subpicture_region_t *ParseUSFString( decoder_t *, char * );
109 static subpicture_region_t *LoadEmbeddedImage( decoder_t *p_dec, const char *psz_filename, int i_transparent_color );
110
111 /*****************************************************************************
112 * OpenDecoder: probe the decoder and return score
113 *****************************************************************************
114 * Tries to launch a decoder and return score so that the interface is able
115 * to chose.
116 *****************************************************************************/
117 static int OpenDecoder( vlc_object_t *p_this )
118 {
119 decoder_t *p_dec = (decoder_t*)p_this;
120 decoder_sys_t *p_sys;
121
122 if( p_dec->fmt_in.i_codec != VLC_CODEC_USF )
123 return VLC_EGENERIC;
124
125 /* Allocate the memory needed to store the decoder's structure */
126 if( ( p_dec->p_sys = p_sys = calloc(1, sizeof(decoder_sys_t)) ) == NULL )
127 return VLC_ENOMEM;
128
129 p_dec->pf_decode = DecodeBlock;
130 p_dec->fmt_out.i_codec = 0;
131
132 /* init of p_sys */
133 TAB_INIT( p_sys->i_ssa_styles, p_sys->pp_ssa_styles );
134 TAB_INIT( p_sys->i_images, p_sys->pp_images );
135
136 /* USF subtitles are mandated to be UTF-8, so don't need vlc_iconv */
137
138 p_sys->i_align = var_CreateGetInteger( p_dec, "subsdec-align" );
139
140 ParseImageAttachments( p_dec );
141
142 if( var_CreateGetBool( p_dec, "subsdec-formatted" ) )
143 {
144 if( p_dec->fmt_in.i_extra > 0 )
145 ParseUSFHeader( p_dec );
146 }
147
148 return VLC_SUCCESS;
149 }
150
151 /****************************************************************************
152 * DecodeBlock: the whole thing
153 ****************************************************************************
154 * This function must be fed with complete subtitles units.
155 ****************************************************************************/
156 static int DecodeBlock( decoder_t *p_dec, block_t *p_block )
157 {
158 subpicture_t *p_spu;
159
160 if( p_block == NULL ) /* No Drain */
161 return VLCDEC_SUCCESS;
162
163 p_spu = ParseText( p_dec, p_block );
164
165 block_Release( p_block );
166 if( p_spu != NULL )
167 decoder_QueueSub( p_dec, p_spu );
168 return VLCDEC_SUCCESS;
169 }
170
171 /*****************************************************************************
172 * CloseDecoder: clean up the decoder
173 *****************************************************************************/
174 static void CloseDecoder( vlc_object_t *p_this )
175 {
176 decoder_t *p_dec = (decoder_t *)p_this;
177 decoder_sys_t *p_sys = p_dec->p_sys;
178
179 if( p_sys->pp_ssa_styles )
180 {
181 for( int i = 0; i < p_sys->i_ssa_styles; i++ )
182 {
183 if( !p_sys->pp_ssa_styles[i] )
184 continue;
185
186 free( p_sys->pp_ssa_styles[i]->psz_stylename );
187 text_style_Delete( p_sys->pp_ssa_styles[i]->p_style );
188 free( p_sys->pp_ssa_styles[i] );
189 }
190 TAB_CLEAN( p_sys->i_ssa_styles, p_sys->pp_ssa_styles );
191 }
192 if( p_sys->pp_images )
193 {
194 for( int i = 0; i < p_sys->i_images; i++ )
195 {
196 if( !p_sys->pp_images[i] )
197 continue;
198
199 if( p_sys->pp_images[i]->p_pic )
200 picture_Release( p_sys->pp_images[i]->p_pic );
201 free( p_sys->pp_images[i]->psz_filename );
202
203 free( p_sys->pp_images[i] );
204 }
205 TAB_CLEAN( p_sys->i_images, p_sys->pp_images );
206 }
207
208 free( p_sys );
209 }
210
211 /*****************************************************************************
212 * ParseText: parse an text subtitle packet and send it to the video output
213 *****************************************************************************/
214 static subpicture_t *ParseText( decoder_t *p_dec, block_t *p_block )
215 {
216 decoder_sys_t *p_sys = p_dec->p_sys;
217 subpicture_t *p_spu = NULL;
218 char *psz_subtitle = NULL;
219
220 if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
221 return NULL;
222
223 /* We cannot display a subpicture with no date */
224 if( p_block->i_pts <= VLC_TS_INVALID )
225 {
226 msg_Warn( p_dec, "subtitle without a date" );
227 return NULL;
228 }
229
230 /* Check validity of packet data */
231 /* An "empty" line containing only \0 can be used to force
232 and ephemer picture from the screen */
233 if( p_block->i_buffer < 1 )
234 {
235 msg_Warn( p_dec, "no subtitle data" );
236 return NULL;
237 }
238
239 /* Should be resiliant against bad subtitles */
240 psz_subtitle = strndup( (const char *)p_block->p_buffer,
241 p_block->i_buffer );
242 if( psz_subtitle == NULL )
243 return NULL;
244
245 /* USF Subtitles are mandated to be UTF-8 -- make sure it is */
246 if (EnsureUTF8( psz_subtitle ) == NULL)
247 {
248 msg_Err( p_dec, "USF subtitles must be in UTF-8 format.\n"
249 "This stream contains USF subtitles which aren't." );
250 }
251
252 /* Create the subpicture unit */
253 p_spu = decoder_NewSubpicture( p_dec, NULL );
254 if( !p_spu )
255 {
256 msg_Warn( p_dec, "can't get spu buffer" );
257 free( psz_subtitle );
258 return NULL;
259 }
260
261 /* Decode USF strings */
262 p_spu->p_region = ParseUSFString( p_dec, psz_subtitle );
263
264 p_spu->i_start = p_block->i_pts;
265 p_spu->i_stop = p_block->i_pts + p_block->i_length;
266 p_spu->b_ephemer = (p_block->i_length == 0);
267 p_spu->b_absolute = false;
268 p_spu->i_original_picture_width = p_sys->i_original_width;
269 p_spu->i_original_picture_height = p_sys->i_original_height;
270
271 free( psz_subtitle );
272
273 return p_spu;
274 }
275
276 static char *GrabAttributeValue( const char *psz_attribute,
277 const char *psz_tag_start )
278 {
279 if( psz_attribute && psz_tag_start )
280 {
281 char *psz_tag_end = strchr( psz_tag_start, '>' );
282 char *psz_found = strcasestr( psz_tag_start, psz_attribute );
283
284 if( psz_found )
285 {
286 psz_found += strlen( psz_attribute );
287
288 if(( *(psz_found++) == '=' ) &&
289 ( *(psz_found++) == '\"' ))
290 {
291 if( psz_found < psz_tag_end )
292 {
293 int i_len = strcspn( psz_found, "\"" );
294 return strndup( psz_found, i_len );
295 }
296 }
297 }
298 }
299 return NULL;
300 }
301
302 static ssa_style_t *ParseStyle( decoder_sys_t *p_sys, char *psz_subtitle )
303 {
304 ssa_style_t *p_ssa_style = NULL;
305 char *psz_style = GrabAttributeValue( "style", psz_subtitle );
306
307 if( psz_style )
308 {
309 for( int i = 0; i < p_sys->i_ssa_styles; i++ )
310 {
311 if( !strcmp( p_sys->pp_ssa_styles[i]->psz_stylename, psz_style ) )
312 p_ssa_style = p_sys->pp_ssa_styles[i];
313 }
314 free( psz_style );
315 }
316 return p_ssa_style;
317 }
318
319 static int ParsePositionAttributeList( char *psz_subtitle, int *i_align,
320 int *i_x, int *i_y )
321 {
322 int i_mask = 0;
323
324 char *psz_align = GrabAttributeValue( "alignment", psz_subtitle );
325 char *psz_margin_x = GrabAttributeValue( "horizontal-margin", psz_subtitle );
326 char *psz_margin_y = GrabAttributeValue( "vertical-margin", psz_subtitle );
327 /* -- UNSUPPORTED
328 char *psz_relative = GrabAttributeValue( "relative-to", psz_subtitle );
329 char *psz_rotate_x = GrabAttributeValue( "rotate-x", psz_subtitle );
330 char *psz_rotate_y = GrabAttributeValue( "rotate-y", psz_subtitle );
331 char *psz_rotate_z = GrabAttributeValue( "rotate-z", psz_subtitle );
332 */
333
334 *i_align = SUBPICTURE_ALIGN_BOTTOM;
335 *i_x = 0;
336 *i_y = 0;
337
338 if( psz_align )
339 {
340 if( !strcasecmp( "TopLeft", psz_align ) )
341 *i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_LEFT;
342 else if( !strcasecmp( "TopCenter", psz_align ) )
343 *i_align = SUBPICTURE_ALIGN_TOP;
344 else if( !strcasecmp( "TopRight", psz_align ) )
345 *i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_RIGHT;
346 else if( !strcasecmp( "MiddleLeft", psz_align ) )
347 *i_align = SUBPICTURE_ALIGN_LEFT;
348 else if( !strcasecmp( "MiddleCenter", psz_align ) )
349 *i_align = 0;
350 else if( !strcasecmp( "MiddleRight", psz_align ) )
351 *i_align = SUBPICTURE_ALIGN_RIGHT;
352 else if( !strcasecmp( "BottomLeft", psz_align ) )
353 *i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_LEFT;
354 else if( !strcasecmp( "BottomCenter", psz_align ) )
355 *i_align = SUBPICTURE_ALIGN_BOTTOM;
356 else if( !strcasecmp( "BottomRight", psz_align ) )
357 *i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_RIGHT;
358
359 i_mask |= ATTRIBUTE_ALIGNMENT;
360 free( psz_align );
361 }
362 if( psz_margin_x )
363 {
364 *i_x = atoi( psz_margin_x );
365 if( strchr( psz_margin_x, '%' ) )
366 i_mask |= ATTRIBUTE_X_PERCENT;
367 else
368 i_mask |= ATTRIBUTE_X;
369
370 free( psz_margin_x );
371 }
372 if( psz_margin_y )
373 {
374 *i_y = atoi( psz_margin_y );
375 if( strchr( psz_margin_y, '%' ) )
376 i_mask |= ATTRIBUTE_Y_PERCENT;
377 else
378 i_mask |= ATTRIBUTE_Y;
379
380 free( psz_margin_y );
381 }
382 return i_mask;
383 }
384
385 static void SetupPositions( subpicture_region_t *p_region, char *psz_subtitle )
386 {
387 int i_mask = 0;
388 int i_align;
389 int i_x, i_y;
390
391 i_mask = ParsePositionAttributeList( psz_subtitle, &i_align, &i_x, &i_y );
392
393 if( i_mask & ATTRIBUTE_ALIGNMENT )
394 p_region->i_align = i_align;
395
396 /* TODO: Setup % based offsets properly, without adversely affecting
397 * everything else in vlc. Will address with separate patch, to
398 * prevent this one being any more complicated.
399 */
400 if( i_mask & ATTRIBUTE_X )
401 p_region->i_x = i_x;
402 else if( i_mask & ATTRIBUTE_X_PERCENT )
403 p_region->i_x = 0;
404
405 if( i_mask & ATTRIBUTE_Y )
406 p_region->i_y = i_y;
407 else if( i_mask & ATTRIBUTE_Y_PERCENT )
408 p_region->i_y = 0;
409 }
410
411 static subpicture_region_t *CreateTextRegion( decoder_t *p_dec,
412 char *psz_subtitle,
413 int i_sys_align )
414 {
415 decoder_sys_t *p_sys = p_dec->p_sys;
416 subpicture_region_t *p_text_region;
417 video_format_t fmt;
418
419 /* Create a new subpicture region */
420 video_format_Init( &fmt, VLC_CODEC_TEXT );
421 fmt.i_width = fmt.i_height = 0;
422 fmt.i_x_offset = fmt.i_y_offset = 0;
423 p_text_region = subpicture_region_New( &fmt );
424 video_format_Clean( &fmt );
425
426 if( p_text_region != NULL )
427 {
428 ssa_style_t *p_ssa_style = NULL;
429
430 p_ssa_style = ParseStyle( p_sys, psz_subtitle );
431 if( !p_ssa_style )
432 {
433 for( int i = 0; i < p_sys->i_ssa_styles; i++ )
434 {
435 if( !strcasecmp( p_sys->pp_ssa_styles[i]->psz_stylename, "Default" ) )
436 p_ssa_style = p_sys->pp_ssa_styles[i];
437 }
438 }
439
440 if( p_ssa_style )
441 {
442 msg_Dbg( p_dec, "style is: %s", p_ssa_style->psz_stylename );
443
444 p_text_region->i_align = p_ssa_style->i_align;
445
446 /* TODO: Setup % based offsets properly, without adversely affecting
447 * everything else in vlc. Will address with separate patch,
448 * to prevent this one being any more complicated.
449
450 * p_ssa_style->i_margin_percent_h;
451 * p_ssa_style->i_margin_percent_v;
452 */
453 p_text_region->i_x = p_ssa_style->i_margin_h;
454 p_text_region->i_y = p_ssa_style->i_margin_v;
455 p_text_region->p_text = text_segment_NewInheritStyle( p_ssa_style->p_style );
456 }
457 else
458 {
459 p_text_region->i_align = SUBPICTURE_ALIGN_BOTTOM | i_sys_align;
460 p_text_region->i_x = i_sys_align ? 20 : 0;
461 p_text_region->i_y = 10;
462 p_text_region->p_text = text_segment_New( NULL );
463 }
464 /* Look for position arguments which may override the style-based
465 * defaults.
466 */
467 SetupPositions( p_text_region, psz_subtitle );
468
469 p_text_region->p_next = NULL;
470 }
471 return p_text_region;
472 }
473
474 static int ParseImageAttachments( decoder_t *p_dec )
475 {
476 decoder_sys_t *p_sys = p_dec->p_sys;
477 input_attachment_t **pp_attachments;
478 int i_attachments_cnt;
479
480 if( VLC_SUCCESS != decoder_GetInputAttachments( p_dec, &pp_attachments, &i_attachments_cnt ))
481 return VLC_EGENERIC;
482
483 for( int k = 0; k < i_attachments_cnt; k++ )
484 {
485 input_attachment_t *p_attach = pp_attachments[k];
486
487 vlc_fourcc_t type = image_Mime2Fourcc( p_attach->psz_mime );
488
489 if( ( type != 0 ) &&
490 ( p_attach->i_data > 0 ) &&
491 ( p_attach->p_data != NULL ) )
492 {
493 picture_t *p_pic = NULL;
494 image_handler_t *p_image;
495
496 p_image = image_HandlerCreate( p_dec );
497 if( p_image != NULL )
498 {
499 block_t *p_block;
500
501 p_block = block_Alloc( p_attach->i_data );
502
503 if( p_block != NULL )
504 {
505 video_format_t fmt_in;
506 video_format_t fmt_out;
507
508 memcpy( p_block->p_buffer, p_attach->p_data, p_attach->i_data );
509
510 memset( &fmt_in, 0, sizeof( video_format_t));
511 memset( &fmt_out, 0, sizeof( video_format_t));
512
513 fmt_in.i_chroma = type;
514 fmt_out.i_chroma = VLC_CODEC_YUVA;
515
516 /* Find a suitable decoder module */
517 if( module_exists( "sdl_image" ) )
518 {
519 /* ffmpeg thinks it can handle bmp properly but it can't (at least
520 * not all of them), so use sdl_image if it is available */
521
522 var_Create( p_dec, "codec", VLC_VAR_STRING | VLC_VAR_DOINHERIT );
523 var_SetString( p_dec, "codec", "sdl_image" );
524 }
525
526 p_pic = image_Read( p_image, p_block, &fmt_in, &fmt_out );
527 var_Destroy( p_dec, "codec" );
528 }
529
530 image_HandlerDelete( p_image );
531 }
532 if( p_pic )
533 {
534 image_attach_t *p_picture = malloc( sizeof(image_attach_t) );
535
536 if( p_picture )
537 {
538 p_picture->psz_filename = strdup( p_attach->psz_name );
539 p_picture->p_pic = p_pic;
540
541 TAB_APPEND( p_sys->i_images, p_sys->pp_images, p_picture );
542 }
543 }
544 }
545 vlc_input_attachment_Delete( pp_attachments[ k ] );
546 }
547 free( pp_attachments );
548
549 return VLC_SUCCESS;
550 }
551
552 static void ParseUSFHeaderTags( decoder_t *p_dec, xml_reader_t *p_xml_reader )
553 {
554 decoder_sys_t *p_sys = p_dec->p_sys;
555 const char *node;
556 ssa_style_t *p_ssa_style = NULL;
557 int i_style_level = 0;
558 int i_metadata_level = 0;
559 int type;
560
561 while( (type = xml_ReaderNextNode( p_xml_reader, &node )) > 0 )
562 {
563 switch( type )
564 {
565 case XML_READER_ENDELEM:
566 switch (i_style_level)
567 {
568 case 0:
569 if( !strcasecmp( "metadata", node ) && (i_metadata_level == 1) )
570 i_metadata_level--;
571 break;
572 case 1:
573 if( !strcasecmp( "styles", node ) )
574 i_style_level--;
575 break;
576 case 2:
577 if( !strcasecmp( "style", node ) )
578 {
579 TAB_APPEND( p_sys->i_ssa_styles, p_sys->pp_ssa_styles, p_ssa_style );
580
581 p_ssa_style = NULL;
582 i_style_level--;
583 }
584 break;
585 }
586 break;
587
588 case XML_READER_STARTELEM:
589 if( !strcasecmp( "metadata", node ) && (i_style_level == 0) )
590 i_metadata_level++;
591 else if( !strcasecmp( "resolution", node ) &&
592 ( i_metadata_level == 1) )
593 {
594 const char *attr, *val;
595 while( (attr = xml_ReaderNextAttr( p_xml_reader, &val )) )
596 {
597 if( !strcasecmp( "x", attr ) )
598 p_sys->i_original_width = atoi( val );
599 else if( !strcasecmp( "y", attr ) )
600 p_sys->i_original_height = atoi( val );
601 }
602 }
603 else if( !strcasecmp( "styles", node ) && (i_style_level == 0) )
604 {
605 i_style_level++;
606 }
607 else if( !strcasecmp( "style", node ) && (i_style_level == 1) )
608 {
609 i_style_level++;
610
611 p_ssa_style = calloc( 1, sizeof(ssa_style_t) );
612 if( unlikely(!p_ssa_style) )
613 return;
614 p_ssa_style->p_style = text_style_Create( STYLE_NO_DEFAULTS );
615 if( unlikely(!p_ssa_style->p_style) )
616 {
617 free(p_ssa_style);
618 return;
619 }
620 /* All styles are supposed to default to Default, and then
621 * one or more settings are over-ridden.
622 * At the moment this only effects styles defined AFTER
623 * Default in the XML
624 */
625 for( int i = 0; i < p_sys->i_ssa_styles; i++ )
626 {
627 if( !strcasecmp( p_sys->pp_ssa_styles[i]->psz_stylename, "Default" ) )
628 {
629 ssa_style_t *p_default_style = p_sys->pp_ssa_styles[i];
630 text_style_t *p_orig_text_style = p_ssa_style->p_style;
631
632 memcpy( p_ssa_style, p_default_style, sizeof( ssa_style_t ) );
633
634 // reset data-members that are not to be overwritten
635 p_ssa_style->p_style = p_orig_text_style;
636 p_ssa_style->psz_stylename = NULL;
637
638 //FIXME: Make font_style a pointer. Actually we double copy some data here,
639 // we use text_style_Copy to avoid copying psz_fontname, though .
640 text_style_Copy( p_ssa_style->p_style, p_default_style->p_style );
641 }
642 }
643
644 const char *attr, *val;
645 while( (attr = xml_ReaderNextAttr( p_xml_reader, &val )) )
646 {
647 if( !strcasecmp( "name", attr ) )
648 {
649 free( p_ssa_style->psz_stylename );
650 p_ssa_style->psz_stylename = strdup( val );
651 }
652 }
653 }
654 else if( !strcasecmp( "fontstyle", node ) && (i_style_level == 2) )
655 {
656 const char *attr, *val;
657 while( (attr = xml_ReaderNextAttr( p_xml_reader, &val )) )
658 {
659 if( !strcasecmp( "face", attr ) )
660 {
661 free( p_ssa_style->p_style->psz_fontname );
662 p_ssa_style->p_style->psz_fontname = strdup( val );
663 }
664 else if( !strcasecmp( "size", attr ) )
665 {
666 if( ( *val == '+' ) || ( *val == '-' ) )
667 {
668 int i_value = atoi( val );
669
670 if( ( i_value >= -5 ) && ( i_value <= 5 ) )
671 p_ssa_style->p_style->i_font_size +=
672 ( i_value * p_ssa_style->p_style->i_font_size ) / 10;
673 else if( i_value < -5 )
674 p_ssa_style->p_style->i_font_size = - i_value;
675 else if( i_value > 5 )
676 p_ssa_style->p_style->i_font_size = i_value;
677 }
678 else
679 p_ssa_style->p_style->i_font_size = atoi( val );
680 }
681 else if( !strcasecmp( "italic", attr ) )
682 {
683 if( !strcasecmp( "yes", val ))
684 p_ssa_style->p_style->i_style_flags |= STYLE_ITALIC;
685 else
686 p_ssa_style->p_style->i_style_flags &= ~STYLE_ITALIC;
687 p_ssa_style->p_style->i_features |= STYLE_HAS_FLAGS;
688 }
689 else if( !strcasecmp( "weight", attr ) )
690 {
691 if( !strcasecmp( "bold", val ))
692 p_ssa_style->p_style->i_style_flags |= STYLE_BOLD;
693 else
694 p_ssa_style->p_style->i_style_flags &= ~STYLE_BOLD;
695 p_ssa_style->p_style->i_features |= STYLE_HAS_FLAGS;
696 }
697 else if( !strcasecmp( "underline", attr ) )
698 {
699 if( !strcasecmp( "yes", val ))
700 p_ssa_style->p_style->i_style_flags |= STYLE_UNDERLINE;
701 else
702 p_ssa_style->p_style->i_style_flags &= ~STYLE_UNDERLINE;
703 p_ssa_style->p_style->i_features |= STYLE_HAS_FLAGS;
704 }
705 else if( !strcasecmp( "color", attr ) )
706 {
707 if( *val == '#' )
708 {
709 unsigned long col = strtol(val+1, NULL, 16);
710 p_ssa_style->p_style->i_font_color = (col & 0x00ffffff);
711 p_ssa_style->p_style->i_font_alpha = (col >> 24) & 0xff;
712 p_ssa_style->p_style->i_features |= STYLE_HAS_FONT_COLOR
713 | STYLE_HAS_FONT_ALPHA;
714 }
715 }
716 else if( !strcasecmp( "outline-color", attr ) )
717 {
718 if( *val == '#' )
719 {
720 unsigned long col = strtol(val+1, NULL, 16);
721 p_ssa_style->p_style->i_outline_color = (col & 0x00ffffff);
722 p_ssa_style->p_style->i_outline_alpha = (col >> 24) & 0xff;
723 p_ssa_style->p_style->i_features |= STYLE_HAS_OUTLINE_COLOR
724 | STYLE_HAS_OUTLINE_ALPHA;
725 }
726 }
727 else if( !strcasecmp( "outline-level", attr ) )
728 {
729 p_ssa_style->p_style->i_outline_width = atoi( val );
730 }
731 else if( !strcasecmp( "shadow-color", attr ) )
732 {
733 if( *val == '#' )
734 {
735 unsigned long col = strtol(val+1, NULL, 16);
736 p_ssa_style->p_style->i_shadow_color = (col & 0x00ffffff);
737 p_ssa_style->p_style->i_shadow_alpha = (col >> 24) & 0xff;
738 p_ssa_style->p_style->i_features |= STYLE_HAS_SHADOW_COLOR
739 | STYLE_HAS_SHADOW_ALPHA;
740 }
741 }
742 else if( !strcasecmp( "shadow-level", attr ) )
743 {
744 p_ssa_style->p_style->i_shadow_width = atoi( val );
745 }
746 else if( !strcasecmp( "back-color", attr ) )
747 {
748 if( *val == '#' )
749 {
750 unsigned long col = strtol(val+1, NULL, 16);
751 p_ssa_style->p_style->i_karaoke_background_color = (col & 0x00ffffff);
752 p_ssa_style->p_style->i_karaoke_background_alpha = (col >> 24) & 0xff;
753 p_ssa_style->p_style->i_features |= STYLE_HAS_K_BACKGROUND_COLOR
754 | STYLE_HAS_K_BACKGROUND_ALPHA;
755 }
756 }
757 else if( !strcasecmp( "spacing", attr ) )
758 {
759 p_ssa_style->p_style->i_spacing = atoi( val );
760 }
761 }
762 }
763 else if( !strcasecmp( "position", node ) && (i_style_level == 2) )
764 {
765 const char *attr, *val;
766 while( (attr = xml_ReaderNextAttr( p_xml_reader, &val )) )
767 {
768 if( !strcasecmp( "alignment", attr ) )
769 {
770 if( !strcasecmp( "TopLeft", val ) )
771 p_ssa_style->i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_LEFT;
772 else if( !strcasecmp( "TopCenter", val ) )
773 p_ssa_style->i_align = SUBPICTURE_ALIGN_TOP;
774 else if( !strcasecmp( "TopRight", val ) )
775 p_ssa_style->i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_RIGHT;
776 else if( !strcasecmp( "MiddleLeft", val ) )
777 p_ssa_style->i_align = SUBPICTURE_ALIGN_LEFT;
778 else if( !strcasecmp( "MiddleCenter", val ) )
779 p_ssa_style->i_align = 0;
780 else if( !strcasecmp( "MiddleRight", val ) )
781 p_ssa_style->i_align = SUBPICTURE_ALIGN_RIGHT;
782 else if( !strcasecmp( "BottomLeft", val ) )
783 p_ssa_style->i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_LEFT;
784 else if( !strcasecmp( "BottomCenter", val ) )
785 p_ssa_style->i_align = SUBPICTURE_ALIGN_BOTTOM;
786 else if( !strcasecmp( "BottomRight", val ) )
787 p_ssa_style->i_align = SUBPICTURE_ALIGN_BOTTOM | SUBPICTURE_ALIGN_RIGHT;
788 }
789 else if( !strcasecmp( "horizontal-margin", attr ) )
790 {
791 if( strchr( val, '%' ) )
792 {
793 p_ssa_style->i_margin_h = 0;
794 p_ssa_style->i_margin_percent_h = atoi( val );
795 }
796 else
797 {
798 p_ssa_style->i_margin_h = atoi( val );
799 p_ssa_style->i_margin_percent_h = 0;
800 }
801 }
802 else if( !strcasecmp( "vertical-margin", attr ) )
803 {
804 if( strchr( val, '%' ) )
805 {
806 p_ssa_style->i_margin_v = 0;
807 p_ssa_style->i_margin_percent_v = atoi( val );
808 }
809 else
810 {
811 p_ssa_style->i_margin_v = atoi( val );
812 p_ssa_style->i_margin_percent_v = 0;
813 }
814 }
815 }
816 }
817 break;
818 }
819 }
820 free( p_ssa_style );
821 }
822
823
824
825 static subpicture_region_t *ParseUSFString( decoder_t *p_dec,
826 char *psz_subtitle )
827 {
828 decoder_sys_t *p_sys = p_dec->p_sys;
829 subpicture_region_t *p_region_first = NULL;
830 subpicture_region_t *p_region_upto = p_region_first;
831
832 while( *psz_subtitle )
833 {
834 if( *psz_subtitle == '<' )
835 {
836 char *psz_end = NULL;
837
838
839 if(( !strncasecmp( psz_subtitle, "<karaoke ", 9 )) ||
840 ( !strncasecmp( psz_subtitle, "<karaoke>", 9 )))
841 {
842 psz_end = strcasestr( psz_subtitle, "</karaoke>" );
843
844 if( psz_end )
845 {
846 subpicture_region_t *p_text_region;
847
848 psz_end += strcspn( psz_end, ">" ) + 1;
849
850 p_text_region = CreateTextRegion( p_dec,
851 psz_subtitle,
852 p_sys->i_align );
853
854 if( !p_region_first )
855 {
856 p_region_first = p_region_upto = p_text_region;
857 }
858 else if( p_text_region )
859 {
860 p_region_upto->p_next = p_text_region;
861 p_region_upto = p_region_upto->p_next;
862 }
863 }
864 }
865 else if(( !strncasecmp( psz_subtitle, "<image ", 7 )) ||
866 ( !strncasecmp( psz_subtitle, "<image>", 7 )))
867 {
868 subpicture_region_t *p_image_region = NULL;
869
870 char *psz_end = strcasestr( psz_subtitle, "</image>" );
871 char *psz_content = strchr( psz_subtitle, '>' );
872 int i_transparent = -1;
873
874 /* If a colorkey parameter is specified, then we have to map
875 * that index in the picture through as transparent (it is
876 * required by the USF spec but is also recommended that if the
877 * creator really wants a transparent colour that they use a
878 * type like PNG that properly supports it; this goes doubly
879 * for VLC because the pictures are stored internally in YUV
880 * and the resulting colour-matching may not produce the
881 * desired results.)
882 */
883 char *psz_tmp = GrabAttributeValue( "colorkey", psz_subtitle );
884 if( psz_tmp )
885 {
886 if( *psz_tmp == '#' )
887 i_transparent = strtol( psz_tmp + 1, NULL, 16 ) & 0x00ffffff;
888 free( psz_tmp );
889 }
890 if( psz_content && ( psz_content < psz_end ) )
891 {
892 char *psz_filename = strndup( &psz_content[1], psz_end - &psz_content[1] );
893 if( psz_filename )
894 {
895 p_image_region = LoadEmbeddedImage( p_dec,
896 psz_filename, i_transparent );
897 free( psz_filename );
898 }
899 }
900
901 if( psz_end ) psz_end += strcspn( psz_end, ">" ) + 1;
902
903 if( p_image_region )
904 {
905 SetupPositions( p_image_region, psz_subtitle );
906
907 p_image_region->p_next = NULL;
908 }
909 if( !p_region_first )
910 {
911 p_region_first = p_region_upto = p_image_region;
912 }
913 else if( p_image_region )
914 {
915 p_region_upto->p_next = p_image_region;
916 p_region_upto = p_region_upto->p_next;
917 }
918 }
919 else
920 {
921 subpicture_region_t *p_text_region;
922
923 if( psz_end )
924 psz_end += strcspn( psz_end, ">" ) + 1;
925 else
926 psz_end = psz_subtitle + strlen( psz_subtitle );
927
928 p_text_region = CreateTextRegion( p_dec,
929 psz_subtitle,
930 p_sys->i_align );
931
932 if( p_text_region )
933 {
934 free( p_text_region->p_text->psz_text );
935 p_text_region->p_text->psz_text = CreatePlainText( psz_subtitle );
936 }
937
938 if( !p_region_first )
939 {
940 p_region_first = p_region_upto = p_text_region;
941 }
942 else if( p_text_region )
943 {
944 p_region_upto->p_next = p_text_region;
945 p_region_upto = p_region_upto->p_next;
946 }
947 }
948 if( psz_end )
949 psz_subtitle = psz_end - 1;
950
951 psz_subtitle += strcspn( psz_subtitle, ">" );
952 }
953
954 psz_subtitle++;
955 }
956
957 return p_region_first;
958 }
959
960 /*****************************************************************************
961 * ParseUSFHeader: Retrieve global formatting information etc
962 *****************************************************************************/
963 static void ParseUSFHeader( decoder_t *p_dec )
964 {
965 stream_t *p_sub = NULL;
966 xml_reader_t *p_xml_reader = NULL;
967
968 p_sub = vlc_stream_MemoryNew( VLC_OBJECT(p_dec),
969 p_dec->fmt_in.p_extra,
970 p_dec->fmt_in.i_extra,
971 true );
972 if( !p_sub )
973 return;
974
975 p_xml_reader = xml_ReaderCreate( p_dec, p_sub );
976 if( likely(p_xml_reader) )
977 {
978 const char *node;
979
980 /* Look for Root Node */
981 if( xml_ReaderNextNode( p_xml_reader, &node ) == XML_READER_STARTELEM
982 && !strcasecmp( "usfsubtitles", node ) )
983 ParseUSFHeaderTags( p_dec, p_xml_reader );
984
985 xml_ReaderDelete( p_xml_reader );
986 }
987 vlc_stream_Delete( p_sub );
988 }
989
990 /* Function now handles tags which has attribute values, and tries
991 * to deal with &' commands too. It no longer modifies the string
992 * in place, so that the original text can be reused
993 */
994 static char *StripTags( char *psz_subtitle )
995 {
996 char *psz_text_start;
997 char *psz_text;
998
999 psz_text = psz_text_start = malloc( strlen( psz_subtitle ) + 1 );
1000 if( !psz_text_start )
1001 return NULL;
1002
1003 while( *psz_subtitle )
1004 {
1005 /* Mask out any pre-existing LFs in the subtitle */
1006 if( *psz_subtitle == '\n' )
1007 *psz_subtitle = ' ';
1008
1009 if( *psz_subtitle == '<' )
1010 {
1011 if( strncasecmp( psz_subtitle, "<br/>", 5 ) == 0 )
1012 *psz_text++ = '\n';
1013
1014 psz_subtitle += strcspn( psz_subtitle, ">" );
1015 }
1016 else if( *psz_subtitle == '&' )
1017 {
1018 if( !strncasecmp( psz_subtitle, "&lt;", 4 ))
1019 {
1020 *psz_text++ = '<';
1021 psz_subtitle += strcspn( psz_subtitle, ";" );
1022 }
1023 else if( !strncasecmp( psz_subtitle, "&gt;", 4 ))
1024 {
1025 *psz_text++ = '>';
1026 psz_subtitle += strcspn( psz_subtitle, ";" );
1027 }
1028 else if( !strncasecmp( psz_subtitle, "&amp;", 5 ))
1029 {
1030 *psz_text++ = '&';
1031 psz_subtitle += strcspn( psz_subtitle, ";" );
1032 }
1033 else if( !strncasecmp( psz_subtitle, "&quot;", 6 ))
1034 {
1035 *psz_text++ = '\"';
1036 psz_subtitle += strcspn( psz_subtitle, ";" );
1037 }
1038 else
1039 {
1040 /* Assume it is just a normal ampersand */
1041 *psz_text++ = '&';
1042 }
1043 }
1044 else
1045 {
1046 *psz_text++ = *psz_subtitle;
1047 }
1048
1049 /* Security fix: Account for the case where input ends early */
1050 if( *psz_subtitle == '\0' ) break;
1051
1052 psz_subtitle++;
1053 }
1054 *psz_text++ = '\0';
1055
1056 char *psz = realloc( psz_text_start, psz_text - psz_text_start );
1057 return likely(psz != NULL) ? psz : psz_text_start;
1058 }
1059
1060 /* Turn a HTML subtitle, turn into a plain-text version,
1061 * complete with sensible whitespace compaction
1062 */
1063
1064 static char *CreatePlainText( char *psz_subtitle )
1065 {
1066 char *psz_text = StripTags( psz_subtitle );
1067 char *s;
1068
1069 if( !psz_text )
1070 return NULL;
1071
1072 s = strpbrk( psz_text, "\t\r\n " );
1073 while( s )
1074 {
1075 char spc = ' ';
1076 int i_whitespace = strspn( s, "\t\r\n " );
1077
1078 /* Favour '\n' over other whitespaces - if one of these
1079 * occurs in the whitespace use a '\n' as our value,
1080 * otherwise just use a ' '
1081 */
1082 for( int k = 0; k < i_whitespace; k++ )
1083 if( s[k] == '\n' ) spc = '\n';
1084
1085 if( i_whitespace > 1 )
1086 {
1087 memmove( &s[1],
1088 &s[i_whitespace],
1089 strlen( s ) - i_whitespace + 1 );
1090 }
1091 *s++ = spc;
1092
1093 s = strpbrk( s, "\t\r\n " );
1094 }
1095 return psz_text;
1096 }
1097
1098 /****************************************************************************
1099 * download and resize image located at psz_url
1100 ***************************************************************************/
1101 static subpicture_region_t *LoadEmbeddedImage( decoder_t *p_dec,
1102 const char *psz_filename,
1103 int i_transparent_color )
1104 {
1105 decoder_sys_t *p_sys = p_dec->p_sys;
1106 subpicture_region_t *p_region;
1107 video_format_t fmt_out;
1108 picture_t *p_pic = NULL;
1109
1110 for( int k = 0; k < p_sys->i_images; k++ )
1111 {
1112 if( p_sys->pp_images &&
1113 !strcmp( p_sys->pp_images[k]->psz_filename, psz_filename ) )
1114 {
1115 p_pic = p_sys->pp_images[k]->p_pic;
1116 break;
1117 }
1118 }
1119
1120 if( !p_pic )
1121 {
1122 msg_Err( p_dec, "Unable to read image %s", psz_filename );
1123 return NULL;
1124 }
1125
1126 /* Display the feed's image */
1127 memset( &fmt_out, 0, sizeof( video_format_t));
1128
1129 fmt_out.i_chroma = VLC_CODEC_YUVA;
1130 fmt_out.i_sar_num = fmt_out.i_sar_den = 1;
1131 fmt_out.i_width =
1132 fmt_out.i_visible_width = p_pic->format.i_visible_width;
1133 fmt_out.i_height =
1134 fmt_out.i_visible_height = p_pic->format.i_visible_height;
1135
1136 p_region = subpicture_region_New( &fmt_out );
1137 if( !p_region )
1138 {
1139 msg_Err( p_dec, "cannot allocate SPU region" );
1140 return NULL;
1141 }
1142 assert( p_pic->format.i_chroma == VLC_CODEC_YUVA );
1143 /* FIXME the copy is probably not needed anymore */
1144 picture_CopyPixels( p_region->p_picture, p_pic );
1145
1146 /* This isn't the best way to do this - if you really want transparency, then
1147 * you're much better off using an image type that supports it like PNG. The
1148 * spec requires this support though.
1149 */
1150 if( i_transparent_color > 0 )
1151 {
1152 int i_r = ( i_transparent_color >> 16 ) & 0xff;
1153 int i_g = ( i_transparent_color >> 8 ) & 0xff;
1154 int i_b = ( i_transparent_color ) & 0xff;
1155
1156 /* FIXME it cannot work as the yuv conversion code will probably NOT match
1157 * this one */
1158 int i_y = ( ( ( 66 * i_r + 129 * i_g + 25 * i_b + 128 ) >> 8 ) + 16 );
1159 int i_u = ( ( -38 * i_r - 74 * i_g + 112 * i_b + 128 ) >> 8 ) + 128 ;
1160 int i_v = ( ( 112 * i_r - 94 * i_g - 18 * i_b + 128 ) >> 8 ) + 128 ;
1161
1162 assert( p_region->fmt.i_chroma == VLC_CODEC_YUVA );
1163 for( unsigned int y = 0; y < p_region->fmt.i_height; y++ )
1164 {
1165 for( unsigned int x = 0; x < p_region->fmt.i_width; x++ )
1166 {
1167 if( p_region->p_picture->Y_PIXELS[y*p_region->p_picture->Y_PITCH + x] != i_y ||
1168 p_region->p_picture->U_PIXELS[y*p_region->p_picture->U_PITCH + x] != i_u ||
1169 p_region->p_picture->V_PIXELS[y*p_region->p_picture->V_PITCH + x] != i_v )
1170 continue;
1171 p_region->p_picture->A_PIXELS[y*p_region->p_picture->A_PITCH + x] = 0;
1172
1173 }
1174 }
1175 }
1176 return p_region;
1177 }
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