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vlc/modules/codec/telx.c

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/*****************************************************************************
* telx.c : Minimalistic Teletext subtitles decoder
*****************************************************************************
* Copyright (C) 2007 Vincent Penne
* Some code converted from ProjectX java dvb decoder (c) 2001-2005 by dvb.matt
* $Id$
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
*
* information on teletext format can be found here :
* http://pdc.ro.nu/teletext.html
*
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <stdint.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_bits.h>
#include <vlc_codec.h>
/* #define TELX_DEBUG */
#ifdef TELX_DEBUG
# define dbg( a ) msg_Dbg a
#else
# define dbg( a )
#endif
/*****************************************************************************
* Module descriptor.
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
static subpicture_t *Decode( decoder_t *, block_t ** );
#define OVERRIDE_PAGE_TEXT N_("Override page")
#define OVERRIDE_PAGE_LONGTEXT N_("Override the indicated page, try this if " \
"your subtitles don't appear (-1 = autodetect from TS, " \
"0 = autodetect from teletext, " \
">0 = actual page number, usually 888 or 889).")
#define IGNORE_SUB_FLAG_TEXT N_("Ignore subtitle flag")
#define IGNORE_SUB_FLAG_LONGTEXT N_("Ignore the subtitle flag, try this if " \
"your subtitles don't appear.")
#define FRENCH_WORKAROUND_TEXT N_("Workaround for France")
#define FRENCH_WORKAROUND_LONGTEXT N_("Some French channels do not flag " \
"their subtitling pages correctly due to a historical " \
"interpretation mistake. Try using this wrong interpretation if " \
"your subtitles don't appear.")
vlc_module_begin ()
set_description( N_("Teletext subtitles decoder") )
set_shortname( "Teletext" )
set_capability( "decoder", 50 )
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_SCODEC )
set_callbacks( Open, Close )
add_integer( "telx-override-page", -1,
OVERRIDE_PAGE_TEXT, OVERRIDE_PAGE_LONGTEXT, true )
add_bool( "telx-ignore-subtitle-flag", false,
IGNORE_SUB_FLAG_TEXT, IGNORE_SUB_FLAG_LONGTEXT, true )
add_bool( "telx-french-workaround", false,
FRENCH_WORKAROUND_TEXT, FRENCH_WORKAROUND_LONGTEXT, true )
vlc_module_end ()
/****************************************************************************
* Local structures
****************************************************************************/
struct decoder_sys_t
{
int i_align;
bool b_is_subtitle[9];
char ppsz_lines[32][128];
char psz_prev_text[512];
mtime_t prev_pts;
int i_page[9];
bool b_erase[9];
const uint16_t * pi_active_national_set[9];
int i_wanted_page, i_wanted_magazine;
bool b_ignore_sub_flag;
};
/****************************************************************************
* Local data
****************************************************************************/
/*
* My doc only mentions 13 national characters, but experiments show there
* are more, in france for example I already found two more (0x9 and 0xb).
*
* Conversion is in this order :
*
* 0x23 0x24 0x40 0x5b 0x5c 0x5d 0x5e 0x5f 0x60 0x7b 0x7c 0x7d 0x7e
* (these are the standard ones)
* 0x08 0x09 0x0a 0x0b 0x0c 0x0d (apparently a control character) 0x0e 0x0f
*/
static const uint16_t ppi_national_subsets[][20] =
{
{ 0x00a3, 0x0024, 0x0040, 0x00ab, 0x00bd, 0x00bb, 0x005e, 0x0023,
0x002d, 0x00bc, 0x00a6, 0x00be, 0x00f7 }, /* english ,000 */
{ 0x00e9, 0x00ef, 0x00e0, 0x00eb, 0x00ea, 0x00f9, 0x00ee, 0x0023,
0x00e8, 0x00e2, 0x00f4, 0x00fb, 0x00e7, 0, 0x00eb, 0, 0x00ef }, /* french ,001 */
{ 0x0023, 0x00a4, 0x00c9, 0x00c4, 0x00d6, 0x00c5, 0x00dc, 0x005f,
0x00e9, 0x00e4, 0x00f6, 0x00e5, 0x00fc }, /* swedish,finnish,hungarian ,010 */
{ 0x0023, 0x016f, 0x010d, 0x0165, 0x017e, 0x00fd, 0x00ed, 0x0159,
0x00e9, 0x00e1, 0x011b, 0x00fa, 0x0161 }, /* czech,slovak ,011 */
{ 0x0023, 0x0024, 0x00a7, 0x00c4, 0x00d6, 0x00dc, 0x005e, 0x005f,
0x00b0, 0x00e4, 0x00f6, 0x00fc, 0x00df }, /* german ,100 */
{ 0x00e7, 0x0024, 0x00a1, 0x00e1, 0x00e9, 0x00ed, 0x00f3, 0x00fa,
0x00bf, 0x00fc, 0x00f1, 0x00e8, 0x00e0 }, /* portuguese,spanish ,101 */
{ 0x00a3, 0x0024, 0x00e9, 0x00b0, 0x00e7, 0x00bb, 0x005e, 0x0023,
0x00f9, 0x00e0, 0x00f2, 0x00e8, 0x00ec }, /* italian ,110 */
{ 0x0023, 0x00a4, 0x0162, 0x00c2, 0x015e, 0x0102, 0x00ce, 0x0131,
0x0163, 0x00e2, 0x015f, 0x0103, 0x00ee }, /* rumanian ,111 */
/* I have these tables too, but I don't know how they can be triggered */
{ 0x0023, 0x0024, 0x0160, 0x0117, 0x0119, 0x017d, 0x010d, 0x016b,
0x0161, 0x0105, 0x0173, 0x017e, 0x012f }, /* lettish,lithuanian ,1000 */
{ 0x0023, 0x0144, 0x0105, 0x005a, 0x015a, 0x0141, 0x0107, 0x00f3,
0x0119, 0x017c, 0x015b, 0x0142, 0x017a }, /* polish, 1001 */
{ 0x0023, 0x00cb, 0x010c, 0x0106, 0x017d, 0x0110, 0x0160, 0x00eb,
0x010d, 0x0107, 0x017e, 0x0111, 0x0161 }, /* serbian,croatian,slovenian, 1010 */
{ 0x0023, 0x00f5, 0x0160, 0x00c4, 0x00d6, 0x017e, 0x00dc, 0x00d5,
0x0161, 0x00e4, 0x00f6, 0x017e, 0x00fc }, /* estonian ,1011 */
{ 0x0054, 0x011f, 0x0130, 0x015e, 0x00d6, 0x00c7, 0x00dc, 0x011e,
0x0131, 0x015f, 0x00f6, 0x00e7, 0x00fc }, /* turkish ,1100 */
};
/*****************************************************************************
* Open: probe the decoder and return score
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to chose.
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t *) p_this;
decoder_sys_t *p_sys = NULL;
int i_val;
if( p_dec->fmt_in.i_codec != VLC_CODEC_TELETEXT)
{
return VLC_EGENERIC;
}
p_dec->pf_decode_sub = Decode;
p_sys = p_dec->p_sys = calloc( 1, sizeof(*p_sys) );
if( p_sys == NULL )
return VLC_ENOMEM;
p_dec->fmt_out.i_cat = SPU_ES;
p_dec->fmt_out.i_codec = 0;
p_sys->i_align = 0;
for ( int i = 0; i < 9; i++ )
p_sys->pi_active_national_set[i] = ppi_national_subsets[1];
i_val = var_CreateGetInteger( p_dec, "telx-override-page" );
if( i_val == -1 && p_dec->fmt_in.subs.teletext.i_magazine != -1 &&
( p_dec->fmt_in.subs.teletext.i_magazine != 1 ||
p_dec->fmt_in.subs.teletext.i_page != 0 ) ) /* ignore if TS demux wants page 100 (unlikely to be sub) */
{
bool b_val;
p_sys->i_wanted_magazine = p_dec->fmt_in.subs.teletext.i_magazine;
p_sys->i_wanted_page = p_dec->fmt_in.subs.teletext.i_page;
b_val = var_CreateGetBool( p_dec, "telx-french-workaround" );
if( p_sys->i_wanted_page < 100 &&
(b_val || (p_sys->i_wanted_page % 16) >= 10))
{
/* See http://www.nada.kth.se/~ragge/vdr/ttxtsubs/TROUBLESHOOTING.txt
* paragraph about French channels - they mix up decimal and
* hexadecimal */
p_sys->i_wanted_page = (p_sys->i_wanted_page / 10) * 16 +
(p_sys->i_wanted_page % 10);
}
}
else if( i_val <= 0 )
{
p_sys->i_wanted_magazine = -1;
p_sys->i_wanted_page = -1;
}
else
{
p_sys->i_wanted_magazine = i_val / 100;
p_sys->i_wanted_page = (((i_val % 100) / 10) << 4)
|((i_val % 100) % 10);
}
p_sys->b_ignore_sub_flag = var_CreateGetBool( p_dec,
"telx-ignore-subtitle-flag" );
msg_Dbg( p_dec, "starting telx on magazine %d page %02x flag %d",
p_sys->i_wanted_magazine, p_sys->i_wanted_page,
p_sys->b_ignore_sub_flag );
return VLC_SUCCESS;
/* error: */
/* if (p_sys) { */
/* free(p_sys); */
/* p_sys = NULL; */
/* } */
/* return VLC_EGENERIC; */
}
/*****************************************************************************
* Close:
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*) p_this;
decoder_sys_t *p_sys = p_dec->p_sys;
free( p_sys );
}
/**************************
* change bits endianness *
**************************/
static uint8_t bytereverse( int n )
{
n = (((n >> 1) & 0x55) | ((n << 1) & 0xaa));
n = (((n >> 2) & 0x33) | ((n << 2) & 0xcc));
n = (((n >> 4) & 0x0f) | ((n << 4) & 0xf0));
return n;
}
static int hamming_8_4( int a )
{
switch (a) {
case 0xA8:
return 0;
case 0x0B:
return 1;
case 0x26:
return 2;
case 0x85:
return 3;
case 0x92:
return 4;
case 0x31:
return 5;
case 0x1C:
return 6;
case 0xBF:
return 7;
case 0x40:
return 8;
case 0xE3:
return 9;
case 0xCE:
return 10;
case 0x6D:
return 11;
case 0x7A:
return 12;
case 0xD9:
return 13;
case 0xF4:
return 14;
case 0x57:
return 15;
default:
return -1; // decoding error , not yet corrected
}
}
// utc-2 --> utf-8
// this is not a general function, but it's enough for what we do here
// the result buffer need to be at least 4 bytes long
static void to_utf8( char * res, uint16_t ch )
{
if( ch >= 0x80 )
{
if( ch >= 0x800 )
{
res[0] = (ch >> 12) | 0xE0;
res[1] = ((ch >> 6) & 0x3F) | 0x80;
res[2] = (ch & 0x3F) | 0x80;
res[3] = 0;
}
else
{
res[0] = (ch >> 6) | 0xC0;
res[1] = (ch & 0x3F) | 0x80;
res[2] = 0;
}
}
else
{
res[0] = ch;
res[1] = 0;
}
}
static void decode_string( char * res, int res_len,
decoder_sys_t *p_sys, int magazine,
uint8_t * packet, int len )
{
char utf8[7];
char * pt = res;
int i;
for ( i = 0; i < len; i++ )
{
int in = bytereverse( packet[i] ) & 0x7f;
uint16_t out = 32;
size_t l;
switch ( in )
{
/* special national characters */
case 0x23:
out = p_sys->pi_active_national_set[magazine][0];
break;
case 0x24:
out = p_sys->pi_active_national_set[magazine][1];
break;
case 0x40:
out = p_sys->pi_active_national_set[magazine][2];
break;
case 0x5b:
out = p_sys->pi_active_national_set[magazine][3];
break;
case 0x5c:
out = p_sys->pi_active_national_set[magazine][4];
break;
case 0x5d:
out = p_sys->pi_active_national_set[magazine][5];
break;
case 0x5e:
out = p_sys->pi_active_national_set[magazine][6];
break;
case 0x5f:
out = p_sys->pi_active_national_set[magazine][7];
break;
case 0x60:
out = p_sys->pi_active_national_set[magazine][8];
break;
case 0x7b:
out = p_sys->pi_active_national_set[magazine][9];
break;
case 0x7c:
out = p_sys->pi_active_national_set[magazine][10];
break;
case 0x7d:
out = p_sys->pi_active_national_set[magazine][11];
break;
case 0x7e:
out = p_sys->pi_active_national_set[magazine][12];
break;
/* some special control characters (empirical) */
case 0x0d:
/* apparently this starts a sequence that ends with 0xb 0xb */
while ( i + 1 < len && (bytereverse( packet[i+1] ) & 0x7f) != 0x0b )
i++;
i += 2;
break;
/* goto skip; */
default:
/* non documented national range 0x08 - 0x0f */
if ( in >= 0x08 && in <= 0x0f )
{
out = p_sys->pi_active_national_set[magazine][13 + in - 8];
break;
}
/* normal ascii */
if ( in > 32 && in < 0x7f )
out = in;
}
/* handle undefined national characters */
if ( out == 0 )
out = 32;
/* convert to utf-8 */
to_utf8( utf8, out );
l = strlen( utf8 );
if ( pt + l < res + res_len - 1 )
{
strcpy(pt, utf8);
pt += l;
}
/* skip: ; */
}
/* end: */
*pt++ = 0;
}
/*****************************************************************************
* Decode:
*****************************************************************************/
static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
subpicture_t *p_spu = NULL;
video_format_t fmt;
/* int erase = 0; */
int len, offset;
#if 0
int i_wanted_magazine = i_conf_wanted_page / 100;
int i_wanted_page = 0x10 * ((i_conf_wanted_page % 100) / 10)
| (i_conf_wanted_page % 10);
#endif
bool b_update = false;
char psz_text[512], *pt = psz_text;
char psz_line[256];
int i, total;
if( pp_block == NULL || *pp_block == NULL )
return NULL;
p_block = *pp_block;
*pp_block = NULL;
dbg((p_dec, "start of telx packet with header %2x\n",
* (uint8_t *) p_block->p_buffer));
len = p_block->i_buffer;
for ( offset = 1; offset + 46 <= len; offset += 46 )
{
uint8_t * packet = (uint8_t *) p_block->p_buffer+offset;
// int vbi = ((0x20 & packet[2]) != 0 ? 0 : 313) + (0x1F & packet[2]);
// dbg((p_dec, "vbi %d header %02x %02x %02x\n", vbi, packet[0], packet[1], packet[2]));
if ( packet[0] == 0xFF ) continue;
/* if (packet[1] != 0x2C) { */
/* printf("wrong header\n"); */
/* //goto error; */
/* continue; */
/* } */
int mpag = (hamming_8_4( packet[4] ) << 4) | hamming_8_4( packet[5] );
int row, magazine;
if ( mpag < 0 )
{
/* decode error */
dbg((p_dec, "mpag hamming error\n"));
continue;
}
row = 0xFF & bytereverse(mpag);
magazine = (7 & row) == 0 ? 8 : (7 & row);
row >>= 3;
if ( p_sys->i_wanted_page != -1
&& magazine != p_sys->i_wanted_magazine )
continue;
if ( row == 0 )
{
/* row 0 : flags and header line */
int flag = 0;
int a;
for ( a = 0; a < 6; a++ )
{
flag |= (0xF & (bytereverse( hamming_8_4(packet[8 + a]) ) >> 4))
<< (a * 4);
}
/* if (!p_sys->b_ignore_sub_flag && !(1 & flag>>15)) */
/* continue; */
p_sys->i_page[magazine] = (0xF0 & bytereverse( hamming_8_4(packet[7]) )) |
(0xF & (bytereverse( hamming_8_4(packet[6]) ) >> 4) );
decode_string( psz_line, sizeof(psz_line), p_sys, magazine,
packet + 14, 40 - 14 );
dbg((p_dec, "mag %d flags %x page %x character set %d subtitles %d", magazine, flag,
p_sys->i_page[magazine],
7 & flag>>21, 1 & flag>>15, psz_line));
p_sys->pi_active_national_set[magazine] =
ppi_national_subsets[7 & (flag >> 21)];
p_sys->b_is_subtitle[magazine] = p_sys->b_ignore_sub_flag
|| ( (1 & (flag >> 15))
&& (1 & (flag>>16)) );
dbg(( p_dec, "FLAGS%s%s%s%s%s%s%s mag_ser %d",
(1 & (flag>>14))? " news" : "",
(1 & (flag>>15))? " subtitle" : "",
(1 & (flag>>7))? " erase" : "",
(1 & (flag>>16))? " suppressed_head" : "",
(1 & (flag>>17))? " update" : "",
(1 & (flag>>18))? " interrupt" : "",
(1 & (flag>>19))? " inhibit" : "",
(1 & (flag>>20)) ));
if ( (p_sys->i_wanted_page != -1
&& p_sys->i_page[magazine] != p_sys->i_wanted_page)
|| !p_sys->b_is_subtitle[magazine] )
continue;
p_sys->b_erase[magazine] = (1 & (flag >> 7));
dbg((p_dec, "%ld --> %ld\n", (long int) p_block->i_pts, (long int)(p_sys->prev_pts+1500000)));
/* kludge here :
* we ignore the erase flag if it happens less than 1.5 seconds
* before last caption
* TODO make this time configurable
* UPDATE the kludge seems to be no more necessary
* so it's commented out*/
if ( /*p_block->i_pts > p_sys->prev_pts + 1500000 && */
p_sys->b_erase[magazine] )
{
int i;
dbg((p_dec, "ERASE !\n"));
p_sys->b_erase[magazine] = 0;
for ( i = 1; i < 32; i++ )
{
if ( !p_sys->ppsz_lines[i][0] ) continue;
/* b_update = true; */
p_sys->ppsz_lines[i][0] = 0;
}
}
/* replace the row if it's different */
if ( strcmp(psz_line, p_sys->ppsz_lines[row]) )
{
strncpy( p_sys->ppsz_lines[row], psz_line,
sizeof(p_sys->ppsz_lines[row]) - 1);
}
b_update = true;
}
else if ( row < 24 )
{
char * t;
int i;
/* row 1-23 : normal lines */
if ( (p_sys->i_wanted_page != -1
&& p_sys->i_page[magazine] != p_sys->i_wanted_page)
|| !p_sys->b_is_subtitle[magazine]
|| (p_sys->i_wanted_page == -1
&& p_sys->i_page[magazine] > 0x99) )
continue;
decode_string( psz_line, sizeof(psz_line), p_sys, magazine,
packet + 6, 40 );
t = psz_line;
/* remove starting spaces */
while ( *t == 32 ) t++;
/* remove trailing spaces */
for ( i = strlen(t) - 1; i >= 0 && t[i] == 32; i-- );
t[i + 1] = 0;
/* replace the row if it's different */
if ( strcmp( t, p_sys->ppsz_lines[row] ) )
{
strncpy( p_sys->ppsz_lines[row], t,
sizeof(p_sys->ppsz_lines[row]) - 1 );
b_update = true;
}
if (t[0])
p_sys->prev_pts = p_block->i_pts;
dbg((p_dec, "%d %d : ", magazine, row));
dbg((p_dec, "%s\n", t));
#ifdef TELX_DEBUG
{
char dbg[256];
dbg[0] = 0;
for ( i = 0; i < 40; i++ )
{
int in = bytereverse(packet[6 + i]) & 0x7f;
sprintf(dbg + strlen(dbg), "%02x ", in);
}
dbg((p_dec, "%s\n", dbg));
dbg[0] = 0;
for ( i = 0; i < 40; i++ )
{
decode_string( psz_line, sizeof(psz_line), p_sys, magazine,
packet + 6 + i, 1 );
sprintf( dbg + strlen(dbg), "%s ", psz_line );
}
dbg((p_dec, "%s\n", dbg));
}
#endif
}
else if ( row == 25 )
{
/* row 25 : alternate header line */
if ( (p_sys->i_wanted_page != -1
&& p_sys->i_page[magazine] != p_sys->i_wanted_page)
|| !p_sys->b_is_subtitle[magazine] )
continue;
decode_string( psz_line, sizeof(psz_line), p_sys, magazine,
packet + 6, 40 );
/* replace the row if it's different */
if ( strcmp( psz_line, p_sys->ppsz_lines[0] ) )
{
strncpy( p_sys->ppsz_lines[0], psz_line,
sizeof(p_sys->ppsz_lines[0]) - 1 );
/* b_update = true; */
}
}
/* else if (row == 26) { */
/* // row 26 : TV listings */
/* } else */
/* dbg((p_dec, "%d %d : %s\n", magazine, row, decode_string(p_sys, magazine, packet+6, 40))); */
}
if ( !b_update )
goto error;
total = 0;
for ( i = 1; i < 24; i++ )
{
size_t l = strlen( p_sys->ppsz_lines[i] );
if ( l > sizeof(psz_text) - total - 1 )
l = sizeof(psz_text) - total - 1;
if ( l > 0 )
{
memcpy( pt, p_sys->ppsz_lines[i], l );
total += l;
pt += l;
if ( sizeof(psz_text) - total - 1 > 0 )
{
*pt++ = '\n';
total++;
}
}
}
*pt = 0;
if ( !strcmp(psz_text, p_sys->psz_prev_text) )
goto error;
dbg((p_dec, "UPDATE TELETEXT PICTURE\n"));
assert( sizeof(p_sys->psz_prev_text) >= sizeof(psz_text) );
strcpy( p_sys->psz_prev_text, psz_text );
/* Create the subpicture unit */
p_spu = decoder_NewSubpicture( p_dec, NULL );
if( !p_spu )
{
msg_Warn( p_dec, "can't get spu buffer" );
goto error;
}
/* Create a new subpicture region */
video_format_Init(&fmt, VLC_CODEC_TEXT);
fmt.i_width = fmt.i_height = 0;
fmt.i_x_offset = fmt.i_y_offset = 0;
p_spu->p_region = subpicture_region_New( &fmt );
if( p_spu->p_region == NULL )
{
msg_Err( p_dec, "cannot allocate SPU region" );
goto error;
}
/* Normal text subs, easy markup */
p_spu->p_region->i_align = SUBPICTURE_ALIGN_BOTTOM | p_sys->i_align;
p_spu->p_region->i_x = p_sys->i_align ? 20 : 0;
p_spu->p_region->i_y = 10;
p_spu->p_region->p_text = text_segment_New(psz_text);
p_spu->i_start = p_block->i_pts;
p_spu->i_stop = p_block->i_pts + p_block->i_length;
p_spu->b_ephemer = (p_block->i_length == 0);
p_spu->b_absolute = false;
dbg((p_dec, "%ld --> %ld\n", (long int) p_block->i_pts/100000, (long int)p_block->i_length/100000));
block_Release( p_block );
return p_spu;
error:
if ( p_spu != NULL )
{
subpicture_Delete( p_spu );
p_spu = NULL;
}
block_Release( p_block );
return NULL;
}