1 /*****************************************************************************
2 * zvbi.c : VBI and Teletext PES demux and decoder using libzvbi
3 *****************************************************************************
4 * Copyright (C) 2007, M2X
7 * Authors: Derk-Jan Hartman <djhartman at m2x dot nl>
8 * Jean-Paul Saman <jpsaman at m2x dot nl>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
24 /*****************************************************************************
26 * information on teletext format can be found here :
27 * http://pdc.ro.nu/teletext.html
29 *****************************************************************************/
31 /* This module implements:
32 * ETSI EN 301 775: VBI data in PES
33 * ETSI EN 300 472: EBU Teletext data in PES
34 * ETSI EN 300 706: Enhanced Teletext (libzvbi)
35 * ETSI EN 300 231: Video Programme System [VPS] (libzvbi)
36 * ETSI EN 300 294: 625-line Wide Screen Signaling [WSS] (libzvbi)
37 * EIA-608 Revision A: Closed Captioning [CC] (libzvbi)
44 #include <vlc_common.h>
45 #include <vlc_plugin.h>
50 #include "vlc_codec.h"
52 /*****************************************************************************
54 *****************************************************************************/
55 static int Open ( vlc_object_t * );
56 static void Close( vlc_object_t * );
58 #define PAGE_TEXT N_("Teletext page")
59 #define PAGE_LONGTEXT N_("Open the indicated Teletext page." \
60 "Default page is index 100")
62 #define OPAQUE_TEXT N_("Text is always opaque")
63 #define OPAQUE_LONGTEXT N_("Setting vbi-opaque to false " \
64 "makes the boxed text transparent." )
66 #define POS_TEXT N_("Teletext alignment")
67 #define POS_LONGTEXT N_( \
68 "You can enforce the teletext position on the video " \
69 "(0=center, 1=left, 2=right, 4=top, 8=bottom, you can " \
70 "also use combinations of these values, eg. 6 = top-right).")
72 #define TELX_TEXT N_("Teletext text subtitles")
73 #define TELX_LONGTEXT N_( "Output teletext subtitles as text " \
74 "instead of as RGBA" )
76 static const int pi_pos_values[] = { 0, 1, 2, 4, 8, 5, 6, 9, 10 };
77 static const char *const ppsz_pos_descriptions[] =
78 { N_("Center"), N_("Left"), N_("Right"), N_("Top"), N_("Bottom"),
79 N_("Top-Left"), N_("Top-Right"), N_("Bottom-Left"), N_("Bottom-Right") };
82 set_description( N_("VBI and Teletext decoder") );
83 set_shortname( N_("VBI & Teletext") );
84 set_capability( "decoder", 51 );
85 set_category( CAT_INPUT );
86 set_subcategory( SUBCAT_INPUT_SCODEC );
87 set_callbacks( Open, Close );
89 add_integer( "vbi-page", 100, NULL,
90 PAGE_TEXT, PAGE_LONGTEXT, false );
91 add_bool( "vbi-opaque", true, NULL,
92 OPAQUE_TEXT, OPAQUE_LONGTEXT, false );
93 add_integer( "vbi-position", 4, NULL, POS_TEXT, POS_LONGTEXT, false );
94 change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
95 add_bool( "vbi-text", false, NULL,
96 TELX_TEXT, TELX_LONGTEXT, false );
99 /****************************************************************************
101 ****************************************************************************/
103 // #define ZVBI_DEBUG
106 DATA_UNIT_EBU_TELETEXT_NON_SUBTITLE = 0x02,
107 DATA_UNIT_EBU_TELETEXT_SUBTITLE = 0x03,
108 DATA_UNIT_EBU_TELETEXT_INVERTED = 0x0C,
110 DATA_UNIT_ZVBI_WSS_CPR1204 = 0xB4,
111 DATA_UNIT_ZVBI_CLOSED_CAPTION_525 = 0xB5,
112 DATA_UNIT_ZVBI_MONOCHROME_SAMPLES_525 = 0xB6,
114 DATA_UNIT_VPS = 0xC3,
115 DATA_UNIT_WSS = 0xC4,
116 DATA_UNIT_CLOSED_CAPTION = 0xC5,
117 DATA_UNIT_MONOCHROME_SAMPLES = 0xC6,
119 DATA_UNIT_STUFFING = 0xFF,
124 vbi_decoder * p_vbi_dec;
125 vbi_dvb_demux * p_dvb_demux;
126 unsigned int i_wanted_page;
127 unsigned int i_last_page;
131 /* Subtitles as text */
134 /* Positioning of Teletext images */
138 static subpicture_t *Decode( decoder_t *, block_t ** );
140 static void event_handler( vbi_event *ev, void *user_data );
141 static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
142 vlc_value_t oldval, vlc_value_t newval, void *p_data );
143 static int OpaquePage( decoder_t *p_dec, vbi_page p_page, video_format_t fmt,
146 static int Opaque( vlc_object_t *p_this, char const *psz_cmd,
147 vlc_value_t oldval, vlc_value_t newval, void *p_data );
148 static int Position( vlc_object_t *p_this, char const *psz_cmd,
149 vlc_value_t oldval, vlc_value_t newval, void *p_data );
151 /*****************************************************************************
152 * Open: probe the decoder and return score
153 *****************************************************************************
154 * Tries to launch a decoder and return score so that the interface is able
156 *****************************************************************************/
157 static int Open( vlc_object_t *p_this )
159 decoder_t *p_dec = (decoder_t *) p_this;
160 decoder_sys_t *p_sys = NULL;
162 if( p_dec->fmt_in.i_codec != VLC_FOURCC('t','e','l','x') )
165 p_dec->pf_decode_sub = Decode;
166 p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
169 memset( p_sys, 0, sizeof(decoder_sys_t) );
171 p_sys->b_update = false;
172 p_sys->p_vbi_dec = vbi_decoder_new();
173 p_sys->p_dvb_demux = vbi_dvb_pes_demux_new( NULL, NULL );
175 if( (p_sys->p_vbi_dec == NULL) || (p_sys->p_dvb_demux == NULL) )
177 msg_Err( p_dec, "VBI decoder/demux could not be created." );
182 vbi_event_handler_register( p_sys->p_vbi_dec, VBI_EVENT_TTX_PAGE |
183 VBI_EVENT_CAPTION | VBI_EVENT_NETWORK |
184 VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO,
185 event_handler, p_dec );
187 /* Create the var on vlc_global. */
188 p_sys->i_wanted_page = var_CreateGetInteger( p_dec, "vbi-page" );
189 var_AddCallback( p_dec, "vbi-page",
190 RequestPage, p_sys );
192 p_sys->b_opaque = var_CreateGetBool( p_dec, "vbi-opaque" );
193 var_AddCallback( p_dec, "vbi-opaque", Opaque, p_sys );
195 p_sys->i_align = var_CreateGetInteger( p_dec, "vbi-position" );
196 var_AddCallback( p_dec, "vbi-position", Position, p_sys );
198 p_sys->b_text = var_CreateGetBool( p_dec, "vbi-text" );
199 // var_AddCallback( p_dec, "vbi-text", Text, p_sys );
201 es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
203 p_dec->fmt_out.video.i_chroma = VLC_FOURCC('T','E','X','T');
205 p_dec->fmt_out.video.i_chroma = VLC_FOURCC('R','G','B','A');
209 /*****************************************************************************
211 *****************************************************************************/
212 static void Close( vlc_object_t *p_this )
214 decoder_t *p_dec = (decoder_t*) p_this;
215 decoder_sys_t *p_sys = p_dec->p_sys;
217 var_Destroy( p_dec, "vbi-opaque" );
218 var_Destroy( p_dec, "vbi-page" );
219 var_DelCallback( p_dec, "vbi-page", RequestPage, p_sys );
220 var_DelCallback( p_dec, "vbi-opaque", Opaque, p_sys );
222 if( p_sys->p_vbi_dec ) vbi_decoder_delete( p_sys->p_vbi_dec );
223 if( p_sys->p_dvb_demux ) vbi_dvb_demux_delete( p_sys->p_dvb_demux );
227 #define MAX_SLICES 32
229 /*****************************************************************************
231 *****************************************************************************/
232 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
234 decoder_sys_t *p_sys = (decoder_sys_t *) p_dec->p_sys;
236 subpicture_t *p_spu = NULL;
238 bool b_cached = false;
240 const uint8_t *p_pos;
243 if( (pp_block == NULL) || (*pp_block == NULL) )
249 p_pos = p_block->p_buffer;
250 i_left = p_block->i_buffer;
254 vbi_sliced p_sliced[MAX_SLICES];
255 unsigned int i_lines = 0;
258 i_lines = vbi_dvb_demux_cor( p_sys->p_dvb_demux, p_sliced,
259 MAX_SLICES, &i_pts, &p_pos, &i_left );
262 vbi_decode( p_sys->p_vbi_dec, p_sliced, i_lines, i_pts / 90000.0 );
265 /* Try to see if the page we want is in the cache yet */
266 b_cached = vbi_fetch_vt_page( p_sys->p_vbi_dec, &p_page,
267 vbi_dec2bcd( p_sys->i_wanted_page ),
268 VBI_ANY_SUBNO, VBI_WST_LEVEL_3p5,
274 if( ( p_sys->i_wanted_page == p_sys->i_last_page ) &&
275 ( p_sys->b_update != true ) )
278 p_sys->b_update = false;
279 p_sys->i_last_page = p_sys->i_wanted_page;
281 msg_Dbg( p_dec, "we now have page: %d ready for display",
282 p_sys->i_wanted_page );
284 /* If there is a page or sub to render, then we do that here */
285 /* Create the subpicture unit */
286 p_spu = p_dec->pf_spu_buffer_new( p_dec );
289 msg_Warn( p_dec, "can't get spu buffer" );
293 /* Create a new subpicture region */
294 memset( &fmt, 0, sizeof(video_format_t) );
295 fmt.i_chroma = p_sys->b_text ? VLC_FOURCC('T','E','X','T') :
296 VLC_FOURCC('R','G','B','A');
297 fmt.i_aspect = p_sys->b_text ? 0 : VOUT_ASPECT_FACTOR;
300 fmt.i_sar_num = fmt.i_sar_den = 1;
301 fmt.i_width = fmt.i_visible_width = p_page.columns * 12;
302 fmt.i_height = fmt.i_visible_height = p_page.rows * 10;
304 fmt.i_bits_per_pixel = p_sys->b_text ? 0 : 32;
305 fmt.i_x_offset = fmt.i_y_offset = 0;
307 p_spu->p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
308 if( p_spu->p_region == NULL )
310 msg_Err( p_dec, "cannot allocate SPU region" );
314 p_spu->p_region->i_x = 0;
315 p_spu->p_region->i_y = 0;
316 p_spu->p_region->i_align = p_sys->i_align;
318 /* Normal text subs, easy markup */
319 p_spu->i_flags = SUBPICTURE_ALIGN_BOTTOM;
321 p_spu->i_start = (mtime_t) p_block->i_pts;
322 p_spu->i_stop = (mtime_t) 0;
323 p_spu->b_ephemer = true;
324 p_spu->b_absolute = false;
325 p_spu->b_pausable = true;
328 p_spu->i_width = fmt.i_width;
329 p_spu->i_height = fmt.i_height;
330 p_spu->i_original_picture_width = p_page.columns * 12;
331 p_spu->i_original_picture_height = p_page.rows * 10;
334 #ifdef WORDS_BIGENDIAN
335 # define ZVBI_PIXFMT_RGBA32 VBI_PIXFMT_RGBA32_BE
337 # define ZVBI_PIXFMT_RGBA32 VBI_PIXFMT_RGBA32_LE
342 unsigned int i_textsize = 7000;
346 i_total = vbi_print_page_region( &p_page, p_text, i_textsize,
347 "UTF-8", 0, 0, 0, 0, p_page.columns, p_page.rows );
348 p_text[i_total] = '\0';
349 /* Strip off the pagenumber */
350 if( i_total <= 40 ) goto error;
351 p_spu->p_region->psz_text = strdup( &p_text[8] );
354 msg_Info( p_dec, "page %x-%x(%d)\n%s", p_page.pgno, p_page.subno, i_total, p_text );
361 vbi_draw_vt_page( &p_page, ZVBI_PIXFMT_RGBA32,
362 p_spu->p_region->picture.p->p_pixels, 1, 1 );
364 p_spu->p_region->picture.p->i_lines = p_page.rows * 10;
365 p_spu->p_region->picture.p->i_pitch = p_page.columns * 12 * 4;
367 p_pic = &(p_spu->p_region->picture);
368 OpaquePage( p_dec, p_page, fmt, &p_pic );
371 #undef ZVBI_PIXFMT_RGBA32
373 vbi_unref_page( &p_page );
374 block_Release( p_block );
378 vbi_unref_page( &p_page );
381 p_dec->pf_spu_buffer_del( p_dec, p_spu );
385 block_Release( p_block );
389 static void event_handler( vbi_event *ev, void *user_data )
391 decoder_t *p_dec = (decoder_t *)user_data;
392 decoder_sys_t *p_sys = p_dec->p_sys;
394 if( ev->type == VBI_EVENT_TTX_PAGE )
397 msg_Info( p_dec, "Page %03x.%02x ",
398 ev->ev.ttx_page.pgno,
399 ev->ev.ttx_page.subno & 0xFF);
401 if( p_sys->i_last_page == vbi_bcd2dec( ev->ev.ttx_page.pgno ) )
402 p_sys->b_update = true;
404 if( ev->ev.ttx_page.clock_update )
405 msg_Dbg( p_dec, "clock" );
407 if( ev->ev.ttx_page.header_update )
408 msg_Dbg( p_dec, "header" );
411 else if( ev->type == VBI_EVENT_CAPTION )
412 msg_Dbg( p_dec, "Caption line: %x", ev->ev.caption.pgno );
413 else if( ev->type == VBI_EVENT_NETWORK )
414 msg_Dbg( p_dec, "Network change" );
415 else if( ev->type == VBI_EVENT_ASPECT )
416 msg_Dbg( p_dec, "Aspect update" );
417 else if( ev->type == VBI_EVENT_NETWORK )
418 msg_Dbg( p_dec, "Program info received" );
421 static int OpaquePage( decoder_t *p_dec, vbi_page p_page,
422 video_format_t fmt, picture_t **p_src )
424 decoder_sys_t *p_sys = (decoder_sys_t *) p_dec->p_sys;
425 uint32_t *p_begin, *p_end;
426 unsigned int x = 0, y = 0;
429 assert( fmt.i_chroma == VLC_FOURCC('R','G','B','A' ) );
431 /* Kludge since zvbi doesn't provide an option to specify opacity. */
432 switch( fmt.i_chroma )
434 case VLC_FOURCC('R','G','B','A' ):
435 p_begin = (uint32_t *)(*p_src)->p->p_pixels;
436 p_end = (uint32_t *)(*p_src)->p->p_pixels +
437 ( fmt.i_width * fmt.i_height );
440 msg_Err( p_dec, "chroma not supported %4.4s", (char *)&fmt.i_chroma );
444 for( ; p_begin < p_end; p_begin++ )
446 opacity = p_page.text[ y / 10 * p_page.columns + x / 12 ].opacity;
449 /* Show video instead of this character */
450 case VBI_TRANSPARENT_SPACE:
453 /* To make the boxed text "closed captioning" transparent
454 * change true to false.
457 if( p_sys->b_opaque )
459 /* Full text transparency. only foreground color is show */
460 case VBI_TRANSPARENT_FULL:
463 /* Transparency for boxed text */
464 case VBI_SEMI_TRANSPARENT:
465 if( (*p_begin & 0xffffff00) == 0xff )
470 if( x >= fmt.i_width )
481 static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
482 vlc_value_t oldval, vlc_value_t newval, void *p_data )
484 decoder_sys_t *p_sys = p_data;
485 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
487 if( (newval.i_int > 0) && (newval.i_int < 999) )
488 p_sys->i_wanted_page = newval.i_int;
493 static int Opaque( vlc_object_t *p_this, char const *psz_cmd,
494 vlc_value_t oldval, vlc_value_t newval, void *p_data )
496 decoder_sys_t *p_sys = p_data;
497 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
500 p_sys->b_opaque = newval.b_bool;
504 static int Position( vlc_object_t *p_this, char const *psz_cmd,
505 vlc_value_t oldval, vlc_value_t newval, void *p_data )
507 decoder_sys_t *p_sys = p_data;
508 VLC_UNUSED(p_this); VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
511 p_sys->i_align = newval.i_int;