* modules/codec/telx.c: Teletext subtitles decoder, patch courtesy of

   Vincent Penne.

AUTHORS

@@ -324,6 +324,11 @@ E: heiko.panther@web.de
 D: Mac OS X audio device selection framework
 S: Germany
 
+N: Vincent Penne
+E: ziggy at sashipa dot com
+D: teletext decoder
+S: France
+
 N: Eric Petit
 E: titer@videolan.org
 C: titer

configure.ac

@@ -1126,7 +1126,7 @@ dnl  default modules
 dnl
 VLC_ADD_PLUGINS([dummy logger memcpy])
 VLC_ADD_PLUGINS([mpgv mpga m4v m4a h264 ps pva avi asf mp4 rawdv nsv real aiff mjpeg demuxdump flacsys tta])
-VLC_ADD_PLUGINS([cvdsub svcdsub spudec subsdec dvbsub mpeg_audio lpcm a52 dts cinepak flac])
+VLC_ADD_PLUGINS([cvdsub svcdsub spudec telx subsdec dvbsub mpeg_audio lpcm a52 dts cinepak flac])
 VLC_ADD_PLUGINS([deinterlace invert adjust transform wave ripple psychedelic gradient motionblur rv32 rotate noise extract])
 VLC_ADD_PLUGINS([converter_fixed mono])
 VLC_ADD_PLUGINS([trivial_resampler ugly_resampler])

modules/codec/Modules.am

@@ -18,6 +18,7 @@ SOURCES_quicktime = quicktime.c
 SOURCES_subsdec = subsdec.c
 SOURCES_faad = faad.c
 SOURCES_dvbsub = dvbsub.c
+SOURCES_telx = telx.c
 SOURCES_mash = mash.cpp
 SOURCES_x264 = x264.c
 SOURCES_twolame = twolame.c

modules/codec/telx.c

+/*****************************************************************************
+ * 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
+ *
+ * TODO :
+ *
+ *****************************************************************************/
+#include <vlc/vlc.h>
+#include <assert.h>
+#include <stdint.h>
+
+// this is an ugly test so that this source compile for both 0.8.6 and current trunk version
+// considere this hack to be temporary, but I need it so that I can maintain my patch
+// for both current svn and 0.8.6 in an easy way.
+#ifdef VLC_ENOITEM
+// svn trunk
+#include "vlc_vout.h"
+#else
+// 0.8.6
+#include <vlc/vout.h>
+#include <vlc/decoder.h>
+#include <vlc/sout.h>
+/* #include "vlc_es.h" */
+/* #include "vlc_block.h" */
+/* #include "vlc_video.h" */
+/* #include "vlc_spu.h" */
+#endif
+
+#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
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int telx_conf_cb ( vlc_object_t *,      /* variable's object */
+			  char const *,            /* variable name */
+			  vlc_value_t,                 /* old value */
+			  vlc_value_t,                 /* new value */
+			  void * );                /* callback data */
+
+/*****************************************************************************
+ * Module descriptor.
+ *****************************************************************************/
+static int  Open ( vlc_object_t * );
+static void Close( vlc_object_t * );
+static subpicture_t *Decode( decoder_t *, block_t ** );
+
+
+#define PAGE_TEXT N_("Teletext page")
+#define PAGE_LONGTEXT N_("Set displayed teletext page for subtitles, 0 for all pages, 888 should be a standard value. Just leave it to zero if your stream has only one language for subtitles.")
+
+#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.")
+
+vlc_module_begin();
+#   define TELX_CFG_PREFIX "telx-"
+    set_description( _("Teletext subtitles decoder") );
+    set_capability( "decoder", 50 );
+    set_category( CAT_INPUT );
+    set_subcategory( SUBCAT_INPUT_SCODEC );
+    set_callbacks( Open, Close );
+
+    add_integer( "telx-page", 0, telx_conf_cb, PAGE_TEXT, PAGE_LONGTEXT,
+                 VLC_FALSE );
+    add_bool( "telx-ignore-subtitle-flag", 0, telx_conf_cb, IGNORE_SUB_FLAG_TEXT, IGNORE_SUB_FLAG_LONGTEXT, 
+	      VLC_TRUE );
+
+vlc_module_end();
+
+/****************************************************************************
+ * Local structures
+ ****************************************************************************/
+
+struct decoder_sys_t
+{
+  int         i_align;
+  int         is_subtitle[9];
+  char        lines[32][128];
+  char        prev_text[512];
+  mtime_t     prev_pts;
+  int         page;
+  int         erase[9];
+  uint16_t *  active_national_set[9];
+};
+
+/****************************************************************************
+ * Local data
+ ****************************************************************************/
+
+static int i_wanted_page = 0; // default 0 = all pages
+static vlc_bool_t b_ignore_sub_flag = 0;
+
+//
+// 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)
+//
+// convertion 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 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
+
+  { 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->active_national_set[i] = national_subsets[1];
+
+    var_Create( p_dec, "telx-page", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
+    var_Get( p_dec, "telx-page", &val );
+    i_wanted_page = val.i_int;
+
+    var_Create( p_dec, "telx-ignore-subtitle-flag", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
+    var_Get( p_dec, "telx-ignore-subtitle-flag", &val );
+    b_ignore_sub_flag = val.b_bool;
+
+    return VLC_SUCCESS;
+
+/*  error: */
+/*     if (p_sys) { */
+/*       free(p_sys); */
+/*       p_sys = NULL; */
+/*     } */
+/*     return VLC_EGENERIC; */
+}
+
+/*****************************************************************************
+ * Config callback
+ *****************************************************************************/
+static int telx_conf_cb ( vlc_object_t * obj,      /* variable's object */
+			  char const * name,       /* variable name */
+			  vlc_value_t oldv,        /* old value */
+			  vlc_value_t newv,        /* new value */
+			  void * data)             /* callback data */
+{
+  if (!strcmp(name, "telx-page")) {
+    i_wanted_page = newv.i_int;
+    dbg((obj, "display teletext page changed to %d\n", i_wanted_page));
+  } else if (!strcmp(name, "telx-ignore-subtitle-flag")) {
+    b_ignore_sub_flag = newv.b_bool;
+    dbg((obj, "ignore sub flag changed to %d\n", (int) b_ignore_sub_flag));
+  }
+
+  return 0;
+}
+
+
+/*****************************************************************************
+ * 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
+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->active_national_set[magazine][0]; 
+      break; 
+    case 0x24:
+      out = p_sys->active_national_set[magazine][1]; 
+      break; 
+    case 0x40:
+      out = p_sys->active_national_set[magazine][2]; 
+      break; 
+    case 0x5b:
+      out = p_sys->active_national_set[magazine][3]; 
+      break; 
+    case 0x5c:
+      out = p_sys->active_national_set[magazine][4]; 
+      break; 
+    case 0x5d:
+      out = p_sys->active_national_set[magazine][5]; 
+      break; 
+    case 0x5e:
+      out = p_sys->active_national_set[magazine][6]; 
+      break; 
+    case 0x5f:
+      out = p_sys->active_national_set[magazine][7]; 
+      break; 
+    case 0x60:
+      out = p_sys->active_national_set[magazine][8]; 
+      break; 
+    case 0x7b:
+      out = p_sys->active_national_set[magazine][9]; 
+      break; 
+    case 0x7c:
+      out = p_sys->active_national_set[magazine][10]; 
+      break; 
+    case 0x7d:
+      out = p_sys->active_national_set[magazine][11]; 
+      break; 
+    case 0x7e:
+      out = p_sys->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->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 error = 1;
+    //int erase = 0;
+    int len, offset;
+    int wanted_magazine = i_wanted_page/100;
+    int wanted_page = 0x10*((i_wanted_page%100)/10) | (i_wanted_page%10);
+    int update = 0;
+    char text[512], * pt = text;
+    char line[256];
+    int i, total;
+
+    if( pp_block == NULL || *pp_block == NULL ) return NULL;
+    p_block = *pp_block;
+    *pp_block = NULL;
+
+    len = p_block->i_buffer;
+    for (offset = 1; offset+46 <= len ; offset += 46) {
+      uint8_t * packet = (uint8_t *) p_block->p_buffer+offset;
+      
+      //dbg((p_dec, "header %02x %02x %02x\n", packet[0], packet[1], packet[2]));
+/*       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 (i_wanted_page && magazine != wanted_magazine) continue;
+
+      if (row == 0) {
+	// row 0 : flags and header line
+	int flag = 0;
+	int a;
+	char * t = NULL;
+	
+	for (a = 0; a < 6; a++)
+	  flag |= (0xF & bytereverse(hamming_8_4(packet[8+a]) )>>4 ) <<(a*4);
+
+	dbg((p_dec, "mag %d flags %x page %x character set %d subtitles %d\n%s\n", magazine, flag, 
+	     //p_sys->page, 
+	     (0xF0 & bytereverse(hamming_8_4(packet[7]) )) |
+	     (0xF & bytereverse(hamming_8_4(packet[6]) )>>4 ),
+	     7 & flag>>21, 1 & flag>>15, t));
+
+/* 	if (!b_ignore_sub_flag && !(1 & flag>>15)) */
+/* 	  continue; */
+
+	p_sys->page = (0xF0 & bytereverse(hamming_8_4(packet[7]) )) |
+	  (0xF & bytereverse(hamming_8_4(packet[6]) )>>4 );
+
+	decode_string(line, sizeof(line), p_sys, magazine, packet+14, 40-14);
+
+	p_sys->active_national_set[magazine] = national_subsets[7 & flag>>21];
+
+	p_sys->is_subtitle[magazine] = b_ignore_sub_flag || (1 & flag>>15);
+	
+ 	if ((i_wanted_page && p_sys->page != wanted_page) || !p_sys->is_subtitle[magazine])
+ 	  continue;
+
+	p_sys->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 secondes before last caption
+	// TODO make this time configurable
+	if (p_block->i_pts > p_sys->prev_pts + 1500000 && 
+	    p_sys->erase[magazine]) {
+	  int i;
+	  
+	  dbg((p_dec, "ERASE !\n"));
+
+	  p_sys->erase[magazine] = 0;	  
+	  for (i=1; i<32; i++) {
+	    if (!p_sys->lines[i][0]) continue;
+	    //update = 1;
+	    p_sys->lines[i][0] = 0;
+	  }
+	}
+
+	// replace the row if it's different
+	if (strcmp(line, p_sys->lines[row])) {
+	  strncpy(p_sys->lines[row], line, sizeof(p_sys->lines[row])-1);
+	}
+	update = 1;
+
+      } else if (row < 24) {
+	char * t;
+	int i;
+	// row 1-23 : normal lines
+
+ 	if ((i_wanted_page && p_sys->page != wanted_page) || !p_sys->is_subtitle[magazine])
+ 	  continue;
+
+	decode_string(line, sizeof(line), p_sys, magazine, packet+6, 40);
+	t = 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->lines[row])) {
+	  strncpy(p_sys->lines[row], t, sizeof(p_sys->lines[row])-1);
+	  update = 1;
+	}
+
+	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(line, sizeof(line), p_sys, magazine, packet+6+i, 1);
+	    sprintf(dbg+strlen(dbg), "%s  ", line);
+	  }
+	  dbg((p_dec, "%s\n", dbg));
+	}
+#endif
+	
+      } else if (row == 25) {
+	// row 25 : alternate header line
+ 	if ((i_wanted_page && p_sys->page != wanted_page) || !p_sys->is_subtitle[magazine])
+ 	  continue;
+
+	decode_string(line, sizeof(line), p_sys, magazine, packet+6, 40);
+	// replace the row if it's different
+	if (strcmp(line, p_sys->lines[0])) {
+	  strncpy(p_sys->lines[0], line, sizeof(p_sys->lines[0])-1);
+	  //update = 1;
+	}
+      }
+/*       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 (!update)
+      goto error;
+
+    total = 0;
+    for (i=1; i<24; i++) {
+      size_t l = strlen(p_sys->lines[i]);
+      if (l > sizeof(text)-total-1)
+	l = sizeof(text)-total-1;
+      if (l > 0) {
+	memcpy(pt, p_sys->lines[i], l);
+	total += l;
+	pt += l;
+	if (sizeof(text)-total-1 > 0) {
+	  *pt++ = '\n';
+	  total++;
+	}
+      }
+    }
+    *pt = 0;
+
+    if (!strcmp(text, p_sys->prev_text))
+      goto error;
+
+    dbg((p_dec, "UPDATE TELETEXT PICTURE\n"));
+
+    assert(sizeof(p_sys->prev_text)>=sizeof(text));
+    strcpy(p_sys->prev_text, 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;
+    }
+    
+    p_spu->b_pausable = VLC_TRUE;
+    
+    /* 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 ) {
+      msg_Err( p_dec, "cannot allocate SPU region" );
+      goto error;
+    }
+
+    /* Normal text subs, easy markup */
+    p_spu->i_flags = 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(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;
+    dbg((p_dec, "%ld --> %ld\n", (long int) p_block->i_pts/100000, (long int)p_block->i_length/100000));
+
+    error = 0;
+
+error:
+    if (error && p_spu) {
+      p_dec->pf_spu_buffer_del( p_dec, p_spu );
+      p_spu = NULL;
+    }
+
+    block_Release( p_block );
+
+    return p_spu;
+}
+