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> for M2X
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 *****************************************************************************/
23 /*****************************************************************************
25 * information on teletext format can be found here :
26 * http://pdc.ro.nu/teletext.html
28 *****************************************************************************/
30 /* This module implements:
31 * ETSI EN 301 775: VBI data in PES
32 * ETSI EN 300 472: EBU Teletext data in PES
33 * ETSI EN 300 706: Enhanced Teletext (libzvbi)
34 * ETSI EN 300 231: Video Programme System [VPS] (libzvbi)
35 * ETSI EN 300 294: 625-line Wide Screen Signaling [WSS] (libzvbi)
36 * EIA-608 Revision A: Closed Captioning [CC] (libzvbi)
46 #include "vlc_codec.h"
47 #include "vlc_image.h"
50 DATA_UNIT_EBU_TELETEXT_NON_SUBTITLE = 0x02,
51 DATA_UNIT_EBU_TELETEXT_SUBTITLE = 0x03,
52 DATA_UNIT_EBU_TELETEXT_INVERTED = 0x0C,
54 DATA_UNIT_ZVBI_WSS_CPR1204 = 0xB4,
55 DATA_UNIT_ZVBI_CLOSED_CAPTION_525 = 0xB5,
56 DATA_UNIT_ZVBI_MONOCHROME_SAMPLES_525 = 0xB6,
60 DATA_UNIT_CLOSED_CAPTION = 0xC5,
61 DATA_UNIT_MONOCHROME_SAMPLES = 0xC6,
63 DATA_UNIT_STUFFING = 0xFF,
66 /*****************************************************************************
68 *****************************************************************************/
69 static int Open ( vlc_object_t * );
70 static void Close( vlc_object_t * );
71 static subpicture_t *Decode( decoder_t *, block_t ** );
73 #define PAGE_TEXT N_("Teletext page")
74 #define PAGE_LONGTEXT N_("Open the indicated Teletext page." \
75 "Default page is index 100")
77 #define OPAQUE_TEXT N_("Text is always opaque")
78 #define OPAQUE_LONGTEXT N_("Setting vbi-opaque to false " \
79 "makes the boxed text transparent." )
81 #define POS_TEXT N_("Teletext alignment")
82 #define POS_LONGTEXT N_( \
83 "You can enforce the teletext position on the video " \
84 "(0=center, 1=left, 2=right, 4=top, 8=bottom, you can " \
85 "also use combinations of these values, eg. 6 = top-right).")
87 static int pi_pos_values[] = { 0, 1, 2, 4, 8, 5, 6, 9, 10 };
88 static const char *ppsz_pos_descriptions[] =
89 { N_("Center"), N_("Left"), N_("Right"), N_("Top"), N_("Bottom"),
90 N_("Top-Left"), N_("Top-Right"), N_("Bottom-Left"), N_("Bottom-Right") };
93 set_description( _("VBI and Teletext decoder") );
94 set_shortname( "VBI & Teletext" );
95 set_capability( "decoder", 51 );
96 set_category( CAT_INPUT );
97 set_subcategory( SUBCAT_INPUT_SCODEC );
98 set_callbacks( Open, Close );
100 add_integer( "vbi-page", 100, NULL,
101 PAGE_TEXT, PAGE_LONGTEXT, VLC_FALSE );
102 add_bool( "vbi-opaque", VLC_TRUE, NULL,
103 OPAQUE_TEXT, OPAQUE_LONGTEXT, VLC_FALSE );
104 add_integer( "vbi-position", 4, NULL, POS_TEXT, POS_LONGTEXT, VLC_FALSE );
105 change_integer_list( pi_pos_values, ppsz_pos_descriptions, 0 );
108 /****************************************************************************
110 ****************************************************************************/
114 vbi_decoder * p_vbi_dec;
115 vbi_dvb_demux * p_dvb_demux;
116 unsigned int i_wanted_page;
117 unsigned int i_last_page;
121 /* Positioning of Teletext images */
125 static void event_handler( vbi_event *ev, void *user_data );
126 static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
127 vlc_value_t oldval, vlc_value_t newval, void *p_data );
128 static int Opaque( vlc_object_t *p_this, char const *psz_cmd,
129 vlc_value_t oldval, vlc_value_t newval, void *p_data );
130 static int Position( vlc_object_t *p_this, char const *psz_cmd,
131 vlc_value_t oldval, vlc_value_t newval, void *p_data );
133 /*****************************************************************************
134 * Open: probe the decoder and return score
135 *****************************************************************************
136 * Tries to launch a decoder and return score so that the interface is able
138 *****************************************************************************/
139 static int Open( vlc_object_t *p_this )
141 decoder_t *p_dec = (decoder_t *) p_this;
142 decoder_sys_t *p_sys = NULL;
144 if( p_dec->fmt_in.i_codec != VLC_FOURCC('t','e','l','x') )
149 p_dec->pf_decode_sub = Decode;
150 p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
153 msg_Err( p_dec, "out of memory" );
157 memset( p_sys, 0, sizeof(decoder_sys_t) );
159 p_sys->p_vbi_dec = vbi_decoder_new();
160 p_sys->p_dvb_demux = vbi_dvb_pes_demux_new( NULL, NULL );
162 if( (p_sys->p_vbi_dec == NULL) || (p_sys->p_dvb_demux == NULL) )
164 msg_Err( p_dec, "VBI decoder/demux could not be created." );
169 vbi_event_handler_register( p_sys->p_vbi_dec, VBI_EVENT_TTX_PAGE |
170 VBI_EVENT_CAPTION | VBI_EVENT_NETWORK |
171 VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO,
172 event_handler, p_dec );
174 /* Create the var on vlc_global. */
175 p_sys->i_wanted_page = var_CreateGetInteger( p_dec->p_libvlc, "vbi-page" );
176 var_AddCallback( p_dec->p_libvlc, "vbi-page",
177 RequestPage, p_sys );
179 p_sys->b_opaque = var_CreateGetBool( p_dec, "vbi-opaque" );
180 var_AddCallback( p_dec, "vbi-opaque", Opaque, p_sys );
182 p_sys->i_align = var_CreateGetInteger( p_dec, "vbi-position" );
183 var_AddCallback( p_dec, "vbi-position", Position, p_sys );
188 /*****************************************************************************
190 *****************************************************************************/
191 static void Close( vlc_object_t *p_this )
193 decoder_t *p_dec = (decoder_t*) p_this;
194 decoder_sys_t *p_sys = p_dec->p_sys;
196 if( p_sys->p_vbi_dec ) vbi_decoder_delete( p_sys->p_vbi_dec );
197 if( p_sys->p_dvb_demux ) vbi_dvb_demux_delete( p_sys->p_dvb_demux );
201 #define MAX_SLICES 32
203 /*****************************************************************************
205 *****************************************************************************/
206 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
208 decoder_sys_t *p_sys = p_dec->p_sys;
210 subpicture_t *p_spu = NULL;
212 vlc_bool_t b_cached = VLC_FALSE;
214 const uint8_t *p_pos;
218 uint32_t *p_begin, *p_end;
219 unsigned int x = 0, y = 0;
221 /* end part of kludge */
223 if( (pp_block == NULL) || (*pp_block == NULL) )
228 p_pos = p_block->p_buffer;
229 i_left = p_block->i_buffer;
233 vbi_sliced p_sliced[MAX_SLICES];
234 unsigned int i_lines = 0;
237 i_lines = vbi_dvb_demux_cor( p_sys->p_dvb_demux, p_sliced,
238 MAX_SLICES, &i_pts, &p_pos, &i_left );
241 vbi_decode( p_sys->p_vbi_dec, p_sliced, i_lines, i_pts / 90000.0 );
244 /* Try to see if the page we want is in the cache yet */
245 b_cached = vbi_fetch_vt_page( p_sys->p_vbi_dec, &p_page,
246 vbi_dec2bcd( p_sys->i_wanted_page ),
247 VBI_ANY_SUBNO, VBI_WST_LEVEL_3p5,
253 if( (p_sys->i_wanted_page == p_sys->i_last_page) &&
254 (p_sys->b_update != VLC_TRUE) )
257 p_sys->i_last_page = p_sys->i_wanted_page;
258 p_sys->b_update = VLC_FALSE;
259 msg_Dbg( p_dec, "we now have page: %d ready for display",
260 p_sys->i_wanted_page );
262 /* If there is a page or sub to render, then we do that here */
263 /* Create the subpicture unit */
264 p_spu = p_dec->pf_spu_buffer_new( p_dec );
267 msg_Warn( p_dec, "can't get spu buffer" );
271 /* Create a new subpicture region */
272 memset( &fmt, 0, sizeof(video_format_t) );
273 fmt.i_chroma = VLC_FOURCC('R','G','B','A');
274 fmt.i_aspect = VOUT_ASPECT_FACTOR;
275 fmt.i_sar_num = fmt.i_sar_den = 1;
276 fmt.i_width = fmt.i_visible_width = p_page.columns * 12;
277 fmt.i_height = fmt.i_visible_height = p_page.rows * 10;
278 fmt.i_bits_per_pixel = 32;
279 fmt.i_x_offset = fmt.i_y_offset = 0;
281 p_spu->p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
282 if( p_spu->p_region == NULL )
284 msg_Err( p_dec, "cannot allocate SPU region" );
288 p_spu->p_region->i_x = 0;
289 p_spu->p_region->i_y = 0;
290 p_spu->p_region->i_align = SUBPICTURE_ALIGN_TOP;
292 /* Normal text subs, easy markup */
293 p_spu->i_flags = SUBPICTURE_ALIGN_TOP;
295 p_spu->i_start = p_block->i_pts;
296 p_spu->i_stop = (mtime_t) 0;
297 p_spu->b_ephemer = VLC_TRUE;
298 p_spu->b_absolute = VLC_FALSE;
299 p_spu->b_pausable = VLC_TRUE;
300 p_spu->i_original_picture_width = p_page.columns * 12;
301 p_spu->i_original_picture_height = p_page.rows * 10;
303 vbi_draw_vt_page( &p_page, VBI_PIXFMT_RGBA32_LE,
304 p_spu->p_region->picture.p->p_pixels, 1, 1 );
305 p_spu->p_region->picture.p->i_lines = p_page.rows * 10;
306 p_spu->p_region->picture.p->i_pitch = p_page.columns * 12 * 4;
308 /* Kludge since zvbi doesn't provide an option to specify opacity. */
309 p_begin = (uint32_t *)p_spu->p_region->picture.p->p_pixels;
310 p_end = (uint32_t *)p_spu->p_region->picture.p->p_pixels+(fmt.i_width * fmt.i_height);
312 for( ; p_begin < p_end; p_begin++ )
314 opacity = p_page.text[ y / 10 * p_page.columns + x / 12 ].opacity;
317 /* Show video instead of this character */
318 case VBI_TRANSPARENT_SPACE:
321 /* To make the boxed text "closed captioning" transparent
322 * change VLC_TRUE to VLC_FALSE.
325 if( p_sys->b_opaque )
327 /* Full text transparency. only foreground color is show */
328 case VBI_TRANSPARENT_FULL:
329 /* Transparency for boxed text */
330 case VBI_SEMI_TRANSPARENT:
331 if( (*p_begin & 0xffffff00) == 0xff )
338 if( x >= fmt.i_width )
347 unsigned int i_total, i_textsize = 7000;
350 i_total = vbi_print_page_region( &p_page, p_text, i_textsize,
351 "ISO-8859-1", 0, 0, 0, 0, p_page.columns,
353 p_text[i_total] = '\0';
355 msg_Dbg( p_dec, "page %x-%x\n%s", p_page.pgno, p_page.subno, p_text );
358 vbi_unref_page( &p_page );
359 block_Release( p_block );
363 vbi_unref_page( &p_page );
366 p_dec->pf_spu_buffer_del( p_dec, p_spu );
370 block_Release( p_block );
374 static void event_handler( vbi_event *ev, void *user_data )
376 decoder_t *p_dec = (decoder_t *)user_data;
377 decoder_sys_t *p_sys = p_dec->p_sys;
379 if( ev->type == VBI_EVENT_TTX_PAGE )
381 /* msg_Dbg( p_dec, "Page %03x.%02x ",
382 ev->ev.ttx_page.pgno,
383 ev->ev.ttx_page.subno & 0xFF);
385 if( p_sys->i_last_page == vbi_bcd2dec( ev->ev.ttx_page.pgno ) )
386 p_sys->b_update = VLC_TRUE;
388 if( ev->ev.ttx_page.clock_update )
389 msg_Dbg( p_dec, "clock" );
390 if( ev->ev.ttx_page.header_update )
391 msg_Dbg( p_dec, "header" );
393 else if( ev->type == VBI_EVENT_CAPTION )
394 msg_Dbg( p_dec, "Caption line: %x", ev->ev.caption.pgno );
395 else if( ev->type == VBI_EVENT_NETWORK )
396 msg_Dbg( p_dec, "Network change" );
397 else if( ev->type == VBI_EVENT_ASPECT )
398 msg_Dbg( p_dec, "Aspect update" );
399 else if( ev->type == VBI_EVENT_NETWORK )
400 msg_Dbg( p_dec, "Program info received" );
403 static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
404 vlc_value_t oldval, vlc_value_t newval, void *p_data )
406 decoder_sys_t *p_sys = p_data;
408 if( (newval.i_int > 0) && (newval.i_int < 999) )
409 p_sys->i_wanted_page = newval.i_int;
414 static int Opaque( vlc_object_t *p_this, char const *psz_cmd,
415 vlc_value_t oldval, vlc_value_t newval, void *p_data )
417 decoder_sys_t *p_sys = p_data;
420 p_sys->b_opaque = newval.b_bool;
424 static int Position( vlc_object_t *p_this, char const *psz_cmd,
425 vlc_value_t oldval, vlc_value_t newval, void *p_data )
427 decoder_sys_t *p_sys = p_data;
430 p_sys->i_align = newval.i_int;