1 /*****************************************************************************
2 * SSA/ASS subtitle decoder using libass.
3 *****************************************************************************
4 * Copyright (C) 2008 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
37 #include <vlc_common.h>
38 #include <vlc_plugin.h>
40 #include <vlc_codec.h>
42 #include <vlc_input.h>
46 /*****************************************************************************
48 *****************************************************************************/
49 static int Create ( vlc_object_t * );
50 static void Destroy( vlc_object_t * );
53 set_shortname( N_("Subtitles (advanced)"))
54 set_description( N_("Subtitle renderers using libass") )
55 set_capability( "decoder", 100 )
56 set_category( CAT_INPUT )
57 set_subcategory( SUBCAT_INPUT_SCODEC )
58 set_callbacks( Create, Destroy )
61 /*****************************************************************************
63 *****************************************************************************/
64 static subpicture_t *DecodeBlock( decoder_t *, block_t ** );
65 static void DestroySubpicture( subpicture_t * );
66 static void PreRender( spu_t *, subpicture_t *, const video_format_t * );
67 static void UpdateRegions( spu_t *,
68 subpicture_t *, const video_format_t *, mtime_t );
70 /* Yes libass sux with threads */
73 vlc_object_t *p_libvlc;
76 ass_library_t *p_library;
77 ass_renderer_t *p_renderer;
80 static ass_handle_t *AssHandleHold( decoder_t *p_dec );
81 static void AssHandleRelease( ass_handle_t * );
86 /* decoder_sys_t is shared between decoder and spu units */
97 subpicture_t *p_spu_final;
99 static void DecSysRelease( decoder_sys_t *p_sys );
100 static void DecSysHold( decoder_sys_t *p_sys );
102 struct subpicture_sys_t
104 decoder_sys_t *p_dec_sys;
118 static int BuildRegions( spu_t *p_spu, rectangle_t *p_region, int i_max_region, ass_image_t *p_img_list, int i_width, int i_height );
119 static void SubpictureReleaseRegions( spu_t *p_spu, subpicture_t *p_subpic );
120 static void RegionDraw( subpicture_region_t *p_region, ass_image_t *p_img );
122 static vlc_mutex_t libass_lock = VLC_STATIC_MUTEX;
124 //#define DEBUG_REGION
126 /*****************************************************************************
127 * Create: Open libass decoder.
128 *****************************************************************************/
129 static int Create( vlc_object_t *p_this )
131 decoder_t *p_dec = (decoder_t *)p_this;
132 decoder_sys_t *p_sys;
133 ass_track_t *p_track;
135 if( p_dec->fmt_in.i_codec != VLC_FOURCC('s','s','a',' ') )
138 p_dec->pf_decode_sub = DecodeBlock;
140 p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
145 p_sys->p_ass = AssHandleHold( p_dec );
151 vlc_mutex_init( &p_sys->lock );
152 p_sys->i_refcount = 1;
155 vlc_mutex_lock( &libass_lock );
156 p_sys->p_track = p_track = ass_new_track( p_sys->p_ass->p_library );
159 vlc_mutex_unlock( &libass_lock );
160 DecSysRelease( p_sys );
163 ass_process_codec_private( p_track, p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
164 vlc_mutex_unlock( &libass_lock );
169 /*****************************************************************************
171 *****************************************************************************/
172 static void Destroy( vlc_object_t *p_this )
174 decoder_t *p_dec = (decoder_t *)p_this;
176 DecSysRelease( p_dec->p_sys );
179 static void DecSysHold( decoder_sys_t *p_sys )
181 vlc_mutex_lock( &p_sys->lock );
183 vlc_mutex_unlock( &p_sys->lock );
185 static void DecSysRelease( decoder_sys_t *p_sys )
188 vlc_mutex_lock( &p_sys->lock );
190 if( p_sys->i_refcount > 0 )
192 vlc_mutex_unlock( &p_sys->lock );
195 vlc_mutex_unlock( &p_sys->lock );
196 vlc_mutex_destroy( &p_sys->lock );
198 vlc_mutex_lock( &libass_lock );
200 ass_free_track( p_sys->p_track );
201 vlc_mutex_unlock( &libass_lock );
203 AssHandleRelease( p_sys->p_ass );
207 /****************************************************************************
209 ****************************************************************************/
210 static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
212 decoder_sys_t *p_sys = p_dec->p_sys;
214 subpicture_t *p_spu = NULL;
217 if( !pp_block || *pp_block == NULL )
221 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
223 block_Release( p_block );
228 if( p_block->i_buffer == 0 || p_block->p_buffer[0] == '\0' )
230 block_Release( p_block );
234 p_spu = decoder_NewSubpicture( p_dec );
237 msg_Warn( p_dec, "can't get spu buffer" );
238 block_Release( p_block );
242 p_spu->p_sys = malloc( sizeof( subpicture_sys_t ));
245 decoder_DeleteSubpicture( p_dec, p_spu );
246 block_Release( p_block );
250 p_spu->p_sys->i_subs_len = p_block->i_buffer;
251 p_spu->p_sys->p_subs_data = malloc( p_block->i_buffer );
252 if( !p_spu->p_sys->p_subs_data )
254 free( p_spu->p_sys );
255 decoder_DeleteSubpicture( p_dec, p_spu );
256 block_Release( p_block );
259 memcpy( p_spu->p_sys->p_subs_data, p_block->p_buffer,
261 p_spu->p_sys->i_pts = p_block->i_pts;
263 p_spu->i_start = p_block->i_pts;
264 p_spu->i_stop = p_block->i_pts + p_block->i_length;
265 p_spu->b_ephemer = true;
266 p_spu->b_absolute = true;
268 vlc_mutex_lock( &libass_lock );
271 ass_process_chunk( p_sys->p_track, p_spu->p_sys->p_subs_data, p_spu->p_sys->i_subs_len,
272 p_spu->i_start / 1000, (p_spu->i_stop-p_spu->i_start) / 1000 );
274 vlc_mutex_unlock( &libass_lock );
276 p_spu->pf_pre_render = PreRender;
277 p_spu->pf_update_regions = UpdateRegions;
278 p_spu->pf_destroy = DestroySubpicture;
279 p_spu->p_sys->p_dec_sys = p_sys;
283 block_Release( p_block );
288 /****************************************************************************
290 ****************************************************************************/
291 static void DestroySubpicture( subpicture_t *p_subpic )
293 DecSysRelease( p_subpic->p_sys->p_dec_sys );
295 free( p_subpic->p_sys->p_subs_data );
296 free( p_subpic->p_sys );
299 static void PreRender( spu_t *p_spu, subpicture_t *p_subpic,
300 const video_format_t *p_fmt )
302 decoder_sys_t *p_dec_sys = p_subpic->p_sys->p_dec_sys;
304 p_dec_sys->p_spu_final = p_subpic;
309 static void UpdateRegions( spu_t *p_spu, subpicture_t *p_subpic,
310 const video_format_t *p_fmt, mtime_t i_ts )
312 decoder_sys_t *p_sys = p_subpic->p_sys->p_dec_sys;
313 ass_handle_t *p_ass = p_sys->p_ass;
318 if( p_subpic != p_sys->p_spu_final )
320 SubpictureReleaseRegions( p_spu, p_subpic );
324 vlc_mutex_lock( &libass_lock );
328 fmt.i_chroma = VLC_FOURCC('R','G','B','A');
329 fmt.i_width = fmt.i_visible_width;
330 fmt.i_height = fmt.i_visible_height;
331 fmt.i_bits_per_pixel = 0;
332 fmt.i_x_offset = fmt.i_y_offset = 0;
334 b_fmt_changed = memcmp( &fmt, &p_ass->fmt, sizeof(fmt) ) != 0;
337 ass_set_frame_size( p_ass->p_renderer, fmt.i_width, fmt.i_height );
338 ass_set_aspect_ratio( p_ass->p_renderer, 1.0 ); // TODO ?
344 const mtime_t i_stream_date = p_subpic->p_sys->i_pts + (i_ts - p_subpic->i_start);
346 ass_image_t *p_img = ass_render_frame( p_ass->p_renderer, p_sys->p_track,
347 i_stream_date/1000, &i_changed );
349 if( !i_changed && !b_fmt_changed )
351 vlc_mutex_unlock( &libass_lock );
356 p_subpic->i_original_picture_height = fmt.i_height;
357 p_subpic->i_original_picture_width = fmt.i_width;
358 SubpictureReleaseRegions( p_spu, p_subpic );
360 /* XXX to improve efficiency we merge regions that are close minimizing
362 * libass tends to create a lot of small regions and thus spu engine
363 * reinstanciate a lot the scaler, and as we do not support subpel blending
364 * it looks ugly (text unaligned).
366 const int i_max_region = 4;
367 rectangle_t region[i_max_region];
368 const int i_region = BuildRegions( p_spu, region, i_max_region, p_img, fmt.i_width, fmt.i_height );
372 vlc_mutex_unlock( &libass_lock );
376 /* Allocate the regions and draw them */
377 subpicture_region_t *pp_region[i_max_region];
378 subpicture_region_t **pp_region_last = &p_subpic->p_region;
380 for( int i = 0; i < i_region; i++ )
382 subpicture_region_t *r;
383 video_format_t fmt_region;
388 fmt_region.i_visible_width = region[i].x1 - region[i].x0;
389 fmt_region.i_height =
390 fmt_region.i_visible_height = region[i].y1 - region[i].y0;
392 pp_region[i] = r = subpicture_region_New( &fmt_region );
395 r->i_x = region[i].x0;
396 r->i_y = region[i].y0;
397 r->i_align = SUBPICTURE_ALIGN_TOP | SUBPICTURE_ALIGN_LEFT;
400 RegionDraw( r, p_img );
404 pp_region_last = &r->p_next;
406 vlc_mutex_unlock( &libass_lock );
409 static rectangle_t r_create( int x0, int y0, int x1, int y1 )
411 rectangle_t r = { x0, y0, x1, y1 };
414 static rectangle_t r_img( const ass_image_t *p_img )
416 return r_create( p_img->dst_x, p_img->dst_y, p_img->dst_x+p_img->w, p_img->dst_y+p_img->h );
418 static void r_add( rectangle_t *r, const rectangle_t *n )
420 r->x0 = __MIN( r->x0, n->x0 );
421 r->y0 = __MIN( r->y0, n->y0 );
422 r->x1 = __MAX( r->x1, n->x1 );
423 r->y1 = __MAX( r->y1, n->y1 );
425 static int r_surface( const rectangle_t *r )
427 return (r->x1-r->x0) * (r->y1-r->y0);
429 static bool r_overlap( const rectangle_t *a, const rectangle_t *b, int i_dx, int i_dy )
431 return __MAX(a->x0-i_dx, b->x0) < __MIN( a->x1+i_dx, b->x1 ) &&
432 __MAX(a->y0-i_dy, b->y0) < __MIN( a->y1+i_dy, b->y1 );
435 static int BuildRegions( spu_t *p_spu, rectangle_t *p_region, int i_max_region, ass_image_t *p_img_list, int i_width, int i_height )
443 int64_t i_ck_start = mdate();
446 for( p_tmp = p_img_list, i_count = 0; p_tmp != NULL; p_tmp = p_tmp->next )
451 ass_image_t **pp_img = calloc( i_count, sizeof(*pp_img) );
455 for( p_tmp = p_img_list, i_count = 0; p_tmp != NULL; p_tmp = p_tmp->next, i_count++ )
456 pp_img[i_count] = p_tmp;
459 const int i_w_inc = __MAX( ( i_width + 49 ) / 50, 32 );
460 const int i_h_inc = __MAX( ( i_height + 99 ) / 100, 32 );
461 int i_maxh = i_w_inc;
462 int i_maxw = i_h_inc;
464 rectangle_t region[i_max_region+1];
467 for( int i_used = 0; i_used < i_count; )
470 for( n = 0; n < i_count; n++ )
475 assert( i_region < i_max_region + 1 );
476 region[i_region++] = r_img( pp_img[n] );
477 pp_img[n] = NULL; i_used++;
482 for( n = 0; n < i_count; n++ )
484 ass_image_t *p_img = pp_img[n];
487 rectangle_t r = r_img( p_img );
491 int i_best_s = INT_MAX;
492 for( k = 0; k < i_region; k++ )
494 if( !r_overlap( ®ion[k], &r, i_maxw, i_maxh ) )
496 int s = r_surface( &r );
505 r_add( ®ion[i_best], &r );
506 pp_img[n] = NULL; i_used++;
512 if( i_region > i_max_region )
516 int i_best_ds = INT_MAX;
519 for( int i = 0; i < i_region; i++ )
521 for( int j = i+1; j < i_region; j++ )
523 rectangle_t n = region[i];
524 r_add( &n, ®ion[j] );
525 int ds = r_surface( &n ) - r_surface( ®ion[i] ) - r_surface( ®ion[j] );
536 msg_Err( p_spu, "Merging %d and %d", i_best_i, i_best_j );
538 r_add( ®ion[i_best_i], ®ion[i_best_j] );
540 if( i_best_j+1 < i_region )
541 memmove( ®ion[i_best_j], ®ion[i_best_j+1], sizeof(*region) * ( i_region - (i_best_j+1) ) );
547 for( int n = 0; n < i_region; n++ )
548 p_region[n] = region[n];
551 int64_t i_ck_time = mdate() - i_ck_start;
552 msg_Err( p_spu, "ASS: %d objects merged into %d region in %d micros", i_count, i_region, (int)(i_ck_time) );
560 static void RegionDraw( subpicture_region_t *p_region, ass_image_t *p_img )
562 const plane_t *p = &p_region->p_picture->p[0];
563 const int i_x = p_region->i_x;
564 const int i_y = p_region->i_y;
565 const int i_width = p_region->fmt.i_width;
566 const int i_height = p_region->fmt.i_height;
568 memset( p->p_pixels, 0x00, p->i_pitch * p->i_lines );
569 for( ; p_img != NULL; p_img = p_img->next )
571 if( p_img->dst_x < i_x || p_img->dst_x + p_img->w > i_x + i_width ||
572 p_img->dst_y < i_y || p_img->dst_y + p_img->h > i_y + i_height )
575 const int r = (p_img->color >> 24)&0xff;
576 const int g = (p_img->color >> 16)&0xff;
577 const int b = (p_img->color >> 8)&0xff;
578 const int a = (p_img->color )&0xff;
581 for( y = 0; y < p_img->h; y++ )
583 for( x = 0; x < p_img->w; x++ )
585 const int alpha = p_img->bitmap[y*p_img->stride+x];
586 const int an = (255 - a) * alpha / 255;
588 uint8_t *p_rgba = &p->p_pixels[(y+p_img->dst_y-i_y) * p->i_pitch + 4 * (x+p_img->dst_x-i_x)];
590 /* Native endianness, but RGBA ordering */
591 p_rgba[0] = ( p_rgba[0] * (255-an) + r * an ) / 255;
592 p_rgba[1] = ( p_rgba[1] * (255-an) + g * an ) / 255;
593 p_rgba[2] = ( p_rgba[2] * (255-an) + b * an ) / 255;
594 p_rgba[3] = 255 - ( 255 - p_rgba[3] ) * ( 255 - an ) / 255;
600 /* XXX Draw a box for debug */
601 #define P(x,y) ((uint32_t*)&p->p_pixels[(y)*p->i_pitch + 4*(x)])
602 for( int y = 0; y < p->i_lines; y++ )
603 *P(0,y) = *P(p->i_visible_pitch/4-1,y) = 0xff000000;
604 for( int x = 0; x < p->i_visible_pitch; x++ )
605 *P(x/4,0) = *P(x/4,p->i_visible_lines-1) = 0xff000000;
611 static void SubpictureReleaseRegions( spu_t *p_spu, subpicture_t *p_subpic )
613 subpicture_region_ChainDelete( p_subpic->p_region );
614 p_subpic->p_region = NULL;
618 static ass_handle_t *AssHandleHold( decoder_t *p_dec )
620 vlc_mutex_lock( &libass_lock );
622 ass_handle_t *p_ass = NULL;
623 ass_library_t *p_library = NULL;
624 ass_renderer_t *p_renderer = NULL;
627 var_Create( p_dec->p_libvlc, "libass-handle", VLC_VAR_ADDRESS );
628 if( var_Get( p_dec->p_libvlc, "libass-handle", &val ) )
629 val.p_address = NULL;
633 p_ass = val.p_address;
637 vlc_mutex_unlock( &libass_lock );
642 p_ass = malloc( sizeof(*p_ass) );
647 p_ass->p_libvlc = VLC_OBJECT(p_dec->p_libvlc);
648 p_ass->i_refcount = 1;
650 /* Create libass library */
651 p_ass->p_library = p_library = ass_library_init();
655 /* load attachments */
656 input_attachment_t **pp_attachments;
659 if( decoder_GetInputAttachments( p_dec, &pp_attachments, &i_attachments ))
662 pp_attachments = NULL;
664 for( int k = 0; k < i_attachments; k++ )
666 input_attachment_t *p_attach = pp_attachments[k];
668 if( !strcasecmp( p_attach->psz_mime, "application/x-truetype-font" ) )
670 msg_Dbg( p_dec, "adding embedded font %s", p_attach->psz_name );
672 ass_add_font( p_ass->p_library, p_attach->psz_name, p_attach->p_data, p_attach->i_data );
674 vlc_input_attachment_Delete( p_attach );
676 free( pp_attachments );
678 char *psz_font_dir = config_GetCacheDir();
681 ass_set_fonts_dir( p_library, psz_font_dir );
682 free( psz_font_dir );
684 ass_set_extract_fonts( p_library, true );
685 ass_set_style_overrides( p_library, NULL );
687 /* Create the renderer */
688 p_ass->p_renderer = p_renderer = ass_renderer_init( p_library );
692 ass_set_use_margins( p_renderer, false);
694 // ass_set_margins( p_renderer, int t, int b, int l, int r);
695 ass_set_hinting( p_renderer, ASS_HINTING_NATIVE ); // No idea
696 ass_set_font_scale( p_renderer, 1.0 );
697 ass_set_line_spacing( p_renderer, 0.0 );
699 const char *psz_font = NULL; /* We don't ship a default font with VLC */
700 const char *psz_family = "Arial"; /* Use Arial if we can't find anything more suitable */
701 #ifdef HAVE_FONTCONFIG
702 ass_set_fonts( p_renderer, psz_font, psz_family ); // setup default font/family
704 /* FIXME you HAVE to give him a font if no fontconfig */
705 ass_set_fonts_nofc( p_renderer, psz_font, psz_family );
707 memset( &p_ass->fmt, 0, sizeof(p_ass->fmt) );
710 val.p_address = p_ass;
711 var_Set( p_dec->p_libvlc, "libass-handle", val );
714 vlc_mutex_unlock( &libass_lock );
719 ass_renderer_done( p_renderer );
721 ass_library_done( p_library );
724 vlc_mutex_unlock( &libass_lock );
727 static void AssHandleRelease( ass_handle_t *p_ass )
729 vlc_mutex_lock( &libass_lock );
731 if( p_ass->i_refcount > 0 )
733 vlc_mutex_unlock( &libass_lock );
737 ass_renderer_done( p_ass->p_renderer );
738 ass_library_done( p_ass->p_library );
741 val.p_address = NULL;
742 var_Set( p_ass->p_libvlc, "libass-handle", val );
744 vlc_mutex_unlock( &libass_lock );