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"
49 DATA_UNIT_EBU_TELETEXT_NON_SUBTITLE = 0x02,
50 DATA_UNIT_EBU_TELETEXT_SUBTITLE = 0x03,
51 DATA_UNIT_EBU_TELETEXT_INVERTED = 0x0C,
53 DATA_UNIT_ZVBI_WSS_CPR1204 = 0xB4,
54 DATA_UNIT_ZVBI_CLOSED_CAPTION_525 = 0xB5,
55 DATA_UNIT_ZVBI_MONOCHROME_SAMPLES_525 = 0xB6,
59 DATA_UNIT_CLOSED_CAPTION = 0xC5,
60 DATA_UNIT_MONOCHROME_SAMPLES = 0xC6,
62 DATA_UNIT_STUFFING = 0xFF,
65 /*****************************************************************************
67 *****************************************************************************/
68 static int Open ( vlc_object_t * );
69 static void Close( vlc_object_t * );
70 static subpicture_t *Decode( decoder_t *, block_t ** );
72 #define PAGE_TEXT N_("Teletext page")
73 #define PAGE_LONGTEXT N_("Open the indicated Teletext page." \
74 "Default page is index 100")
77 set_description( _("VBI and Teletext decoder") );
78 set_shortname( "VBI & Teletext" );
79 set_capability( "decoder", 51 );
80 set_category( CAT_INPUT );
81 set_subcategory( SUBCAT_INPUT_SCODEC );
82 set_callbacks( Open, Close );
84 add_integer( "vbi-page", 100, NULL,
85 PAGE_TEXT, PAGE_LONGTEXT, VLC_FALSE );
88 /****************************************************************************
90 ****************************************************************************/
94 vbi_decoder * p_vbi_dec;
95 vbi_dvb_demux * p_dvb_demux;
96 unsigned int i_wanted_page;
97 unsigned int i_last_page;
101 static void event_handler( vbi_event *ev, void *user_data );
102 static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
103 vlc_value_t oldval, vlc_value_t newval, void *p_data );
105 /*****************************************************************************
106 * Open: probe the decoder and return score
107 *****************************************************************************
108 * Tries to launch a decoder and return score so that the interface is able
110 *****************************************************************************/
111 static int Open( vlc_object_t *p_this )
113 decoder_t *p_dec = (decoder_t *) p_this;
114 decoder_sys_t *p_sys = NULL;
118 if( p_dec->fmt_in.i_codec != VLC_FOURCC('t','e','l','x') )
123 p_dec->pf_decode_sub = Decode;
124 p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
127 msg_Err( p_dec, "out of memory" );
130 memset( p_sys, 0, sizeof(decoder_sys_t) );
132 p_sys->p_vbi_dec = vbi_decoder_new();
133 p_sys->p_dvb_demux = vbi_dvb_pes_demux_new( NULL, NULL );
135 if( (p_sys->p_vbi_dec == NULL) || (p_sys->p_dvb_demux == NULL) )
137 msg_Err( p_dec, "VBI decoder/demux could not be created." );
141 vbi_event_handler_register( p_sys->p_vbi_dec, VBI_EVENT_TTX_PAGE |
142 VBI_EVENT_CAPTION | VBI_EVENT_NETWORK |
143 VBI_EVENT_ASPECT | VBI_EVENT_PROG_INFO,
144 event_handler, p_dec );
146 /* Create the var on vlc_global. */
147 p_sys->i_wanted_page = var_CreateGetInteger( p_dec->p_libvlc_global,
149 var_AddCallback( p_dec->p_libvlc_global, "vbi-page",
150 RequestPage, p_sys );
154 /*****************************************************************************
156 *****************************************************************************/
157 static void Close( vlc_object_t *p_this )
159 decoder_t *p_dec = (decoder_t*) p_this;
160 decoder_sys_t *p_sys = p_dec->p_sys;
162 if( p_sys->p_vbi_dec ) vbi_decoder_delete( p_sys->p_vbi_dec );
163 if( p_sys->p_dvb_demux ) vbi_dvb_demux_delete( p_sys->p_dvb_demux );
167 #define MAX_SLICES 32
169 /*****************************************************************************
171 *****************************************************************************/
172 static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
174 decoder_sys_t *p_sys = p_dec->p_sys;
176 subpicture_t *p_spu = NULL;
178 vlc_bool_t b_cached = VLC_FALSE;
183 if( (pp_block == NULL) || (*pp_block == NULL) )
188 p_pos = p_block->p_buffer;
189 i_left = p_block->i_buffer;
193 vbi_sliced p_sliced[MAX_SLICES];
194 unsigned int i_lines = 0;
197 i_lines = vbi_dvb_demux_cor( p_sys->p_dvb_demux, p_sliced,
198 MAX_SLICES, &i_pts, &p_pos, &i_left );
201 vbi_decode( p_sys->p_vbi_dec, p_sliced, i_lines, i_pts / 90000.0 );
205 /* Try to see if the page we want is in the cache yet */
206 b_cached = vbi_fetch_vt_page( p_sys->p_vbi_dec, &p_page,
207 vbi_dec2bcd( p_sys->i_wanted_page ),
208 VBI_ANY_SUBNO, VBI_WST_LEVEL_3p5,
214 if( (p_sys->i_wanted_page == p_sys->i_last_page) &&
215 (p_sys->b_update != VLC_TRUE) )
218 p_sys->i_last_page = p_sys->i_wanted_page;
219 p_sys->b_update = VLC_FALSE;
220 msg_Dbg( p_dec, "we now have page: %d ready for display",
221 p_sys->i_wanted_page );
223 /* If there is a page or sub to render, then we do that here */
224 /* Create the subpicture unit */
225 p_spu = p_dec->pf_spu_buffer_new( p_dec );
228 msg_Warn( p_dec, "can't get spu buffer" );
232 /* Create a new subpicture region */
233 memset( &fmt, 0, sizeof(video_format_t) );
234 fmt.i_chroma = VLC_FOURCC('R','G','B','A');
235 fmt.i_aspect = VOUT_ASPECT_FACTOR;
236 fmt.i_sar_num = fmt.i_sar_den = 1;
237 fmt.i_width = fmt.i_visible_width = p_page.columns * 12;
238 fmt.i_height = fmt.i_visible_height = p_page.rows * 10;
239 fmt.i_bits_per_pixel = 32;
240 fmt.i_x_offset = fmt.i_y_offset = 0;
242 p_spu->p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
243 if( p_spu->p_region == NULL )
245 msg_Err( p_dec, "cannot allocate SPU region" );
249 p_spu->p_region->i_x = 0;
250 p_spu->p_region->i_y = 0;
252 /* Normal text subs, easy markup */
253 p_spu->i_flags = SUBPICTURE_ALIGN_TOP;
255 p_spu->i_start = p_block->i_pts;
257 p_spu->b_ephemer = VLC_TRUE;
258 p_spu->b_absolute = VLC_FALSE;
259 p_spu->b_pausable = VLC_TRUE;
260 p_spu->i_original_picture_width = p_page.columns * 12;
261 p_spu->i_original_picture_height = p_page.rows * 10;
263 vbi_draw_vt_page( &p_page, VBI_PIXFMT_RGBA32_LE,
264 p_spu->p_region->picture.p->p_pixels, 1, 1 );
265 p_spu->p_region->picture.p->i_lines = p_page.rows * 10;
266 p_spu->p_region->picture.p->i_pitch = p_page.columns * 12 * 4;
269 unsigned int i_total, i_textsize = 7000;
272 i_total = vbi_print_page_region( &p_page, p_text, i_textsize, "ISO-8859-1", 0, 0, 0, 0, p_page.columns, p_page.rows );
273 p_text[i_total] = '\0';
275 msg_Dbg( p_dec, "page %x-%x\n%s", p_page.pgno, p_page.subno, p_text );
278 //if( p_page != NULL)
279 vbi_unref_page( &p_page );
281 block_Release( p_block );
285 //if( p_page != NULL)
286 vbi_unref_page( &p_page );
289 p_dec->pf_spu_buffer_del( p_dec, p_spu );
293 block_Release( p_block );
297 static void event_handler( vbi_event *ev, void *user_data)
299 decoder_t *p_dec = (decoder_t *)user_data;
300 decoder_sys_t *p_sys = p_dec->p_sys;
302 if( ev->type == VBI_EVENT_TTX_PAGE )
304 /* msg_Dbg( p_dec, "Page %03x.%02x ",
305 ev->ev.ttx_page.pgno,
306 ev->ev.ttx_page.subno & 0xFF);
308 if( p_sys->i_last_page == vbi_bcd2dec( ev->ev.ttx_page.pgno ) )
309 p_sys->b_update = VLC_TRUE;
311 if( ev->ev.ttx_page.clock_update )
312 msg_Dbg( p_dec, "clock" );
313 if( ev->ev.ttx_page.header_update )
314 msg_Dbg( p_dec, "header" );
316 else if( ev->type == VBI_EVENT_CAPTION )
317 msg_Dbg( p_dec, "Caption line: %x", ev->ev.caption.pgno );
318 else if( ev->type == VBI_EVENT_NETWORK )
319 msg_Dbg( p_dec, "Network change" );
320 else if( ev->type == VBI_EVENT_ASPECT )
321 msg_Dbg( p_dec, "Aspect update" );
322 else if( ev->type == VBI_EVENT_NETWORK )
323 msg_Dbg( p_dec, "Program info received" );
326 static int RequestPage( vlc_object_t *p_this, char const *psz_cmd,
327 vlc_value_t oldval, vlc_value_t newval, void *p_data )
329 decoder_sys_t *p_sys = p_data;
331 if( (newval.i_int > 0) && (newval.i_int < 999) )
332 p_sys->i_wanted_page = newval.i_int;