--- /dev/null
+/*****************************************************************************
+ * 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 General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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
+ *
+ *****************************************************************************/
+#include <vlc/vlc.h>
+#include <assert.h>
+#include <stdint.h>
+
+#include "vlc_vout.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( _("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, NULL,
+ OVERRIDE_PAGE_TEXT, OVERRIDE_PAGE_LONGTEXT, VLC_TRUE );
+ add_bool( "telx-ignore-subtitle-flag", 0, NULL,
+ IGNORE_SUB_FLAG_TEXT, IGNORE_SUB_FLAG_LONGTEXT, VLC_TRUE );
+ add_bool( "telx-french-workaround", 0, NULL,
+ FRENCH_WORKAROUND_TEXT, FRENCH_WORKAROUND_LONGTEXT, VLC_TRUE );
+
+vlc_module_end();
+
+/****************************************************************************
+ * Local structures
+ ****************************************************************************/
+
+struct decoder_sys_t
+{
+ int i_align;
+ vlc_bool_t b_is_subtitle[9];
+ char ppsz_lines[32][128];
+ char psz_prev_text[512];
+ mtime_t prev_pts;
+ int i_page[9];
+ vlc_bool_t b_erase[9];
+ uint16_t * pi_active_national_set[9];
+ int i_wanted_page, i_wanted_magazine;
+ vlc_bool_t 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 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, 0x0115, 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;
+ vlc_value_t val;
+ int i;
+
+ if( p_dec->fmt_in.i_codec != VLC_FOURCC('t','e','l','x'))
+ {
+ return VLC_EGENERIC;
+ }
+
+ p_dec->pf_decode_sub = Decode;
+ p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
+ if( p_sys == NULL )
+ {
+ msg_Err( p_dec, "out of memory" );
+ return VLC_ENOMEM;
+ }
+
+
+ memset( p_sys, 0, sizeof(decoder_sys_t) );
+
+ p_sys->i_align = 0;
+ for ( i = 0; i < 9; i++ )
+ p_sys->pi_active_national_set[i] = ppi_national_subsets[1];
+
+ var_Create( p_dec, "telx-override-page",
+ VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
+ var_Get( p_dec, "telx-override-page", &val );
+ if( val.i_int == -1 && p_dec->fmt_in.subs.dvb.i_id != -1 )
+ {
+ p_sys->i_wanted_magazine = p_dec->fmt_in.subs.dvb.i_id >> 16;
+ if( p_sys->i_wanted_magazine == 0 )
+ p_sys->i_wanted_magazine = 8;
+ p_sys->i_wanted_page = p_dec->fmt_in.subs.dvb.i_id & 0xff;
+
+ var_Create( p_dec, "telx-french-workaround",
+ VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
+ var_Get( p_dec, "telx-french-workaround", &val );
+ if( p_sys->i_wanted_page < 100 &&
+ (val.b_bool || (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( val.i_int <= 0 )
+ {
+ p_sys->i_wanted_magazine = -1;
+ p_sys->i_wanted_page = -1;
+ }
+ else
+ {
+ p_sys->i_wanted_magazine = val.i_int / 100;
+ p_sys->i_wanted_page = (((val.i_int % 100) / 10) << 4)
+ | ((val.i_int % 100) % 10);
+ }
+ var_Create( p_dec, "telx-ignore-subtitle-flag",
+ VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
+ var_Get( p_dec, "telx-ignore-subtitle-flag", &val );
+ p_sys->b_ignore_sub_flag = val.b_bool;
+
+ msg_Dbg( p_dec, "starting telx on magazine %d page %x 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
+ vlc_bool_t b_update = VLC_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 = VLC_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 = VLC_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 = VLC_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 = VLC_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 = p_dec->pf_spu_buffer_new( p_dec );
+ if( !p_spu )
+ {
+ msg_Warn( p_dec, "can't get spu buffer" );
+ goto error;
+ }
+
+ /* Create a new subpicture region */
+ memset( &fmt, 0, sizeof(video_format_t) );
+ fmt.i_chroma = VLC_FOURCC('T','E','X','T');
+ fmt.i_aspect = 0;
+ fmt.i_width = fmt.i_height = 0;
+ fmt.i_x_offset = fmt.i_y_offset = 0;
+ p_spu->p_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &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->i_x = p_sys->i_align ? 20 : 0;
+ p_spu->i_y = 10;
+
+ p_spu->p_region->psz_text = strdup(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 = VLC_FALSE;
+ p_spu->b_pausable = VLC_TRUE;
+ 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 )
+ {
+ p_dec->pf_spu_buffer_del( p_dec, p_spu );
+ p_spu = NULL;
+ }
+
+ block_Release( p_block );
+ return NULL;
+}
+
projects / vlc / commitdiff