Trivial encoder for plain-text subtitles.

This allows transcoding say, DVD or DVB subs to normal ones.

Only tested with RTP output, but might also work with ogg, mp4, ts...
The problem is that most of these do not seem to check the encoding.

configure.ac

@@ -1197,7 +1197,7 @@ dnl  default modules
 dnl
 VLC_ADD_PLUGINS([dummy logger memcpy])
 VLC_ADD_PLUGINS([mpgv mpga m4v m4a h264 vc1 ps pva avi asf mp4 rawdv rawvid nsv real aiff mjpeg demuxdump flacsys tta])
-VLC_ADD_PLUGINS([cvdsub svcdsub spudec subsdec subsusf dvbsub mpeg_audio lpcm a52 dts cinepak flac])
+VLC_ADD_PLUGINS([cvdsub svcdsub spudec subsdec subsusf t140 dvbsub mpeg_audio lpcm a52 dts cinepak flac])
 VLC_ADD_PLUGINS([deinterlace invert adjust transform wave ripple psychedelic gradient motionblur rv32 rotate noise grain extract sharpen seamcarving])
 VLC_ADD_PLUGINS([converter_fixed mono])
 VLC_ADD_PLUGINS([trivial_resampler ugly_resampler])

modules/codec/subtitles/Modules.am

@@ -1,2 +1,3 @@
 SOURCES_subsdec = subsass.c subsdec.c subsdec.h
 SOURCES_subsusf = subsusf.c subsdec.h
+SOURCES_t140 = t140.c

modules/codec/subtitles/t140.c

@@ -0,0 +1,100 @@
+/*****************************************************************************
+ * t140.c : trivial T.140 text encoder
+ *****************************************************************************
+ * Copyright © 2007 Rémi Denis-Courmont
+ * $Id$
+ *
+ * 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.
+ *****************************************************************************/
+
+#include <vlc/vlc.h>
+#include <vlc_vout.h>
+#include <vlc_codec.h>
+#include <vlc_sout.h>
+
+static int  Open ( vlc_object_t * );
+static void Close( vlc_object_t * );
+
+vlc_module_begin();
+    add_submodule();
+    set_description( _("T.140 text encoder") );
+    set_capability( "encoder", 100 );
+    set_callbacks( Open, Close );
+vlc_module_end();
+
+
+static block_t *Encode ( encoder_t *, subpicture_t * );
+
+
+static int Open( vlc_object_t *p_this )
+{
+    encoder_t *p_enc = (encoder_t *)p_this;
+
+    switch( p_enc->fmt_out.i_codec )
+    {
+        case VLC_FOURCC('s','u','b','t'):
+            if( ( p_enc->fmt_out.subs.psz_encoding != NULL )
+             && strcasecmp( p_enc->fmt_out.subs.psz_encoding, "utf8" )
+             && strcasecmp( p_enc->fmt_out.subs.psz_encoding, "UTF-8" ) )
+            {
+                msg_Err( p_this, "Only UTF-8 encoding supported" );
+                return VLC_EGENERIC;
+            }
+        case VLC_FOURCC('t','1','4','0'):
+            break;
+
+        default:
+            if( !p_enc->b_force )
+                return VLC_EGENERIC;
+
+            p_enc->fmt_out.i_codec = VLC_FOURCC('t','1','4','0');
+    }
+
+    p_enc->p_sys = NULL;
+
+    p_enc->pf_encode_sub = Encode;
+    return VLC_SUCCESS;
+}
+
+
+static void Close( vlc_object_t *p_this )
+{
+    msg_Err( p_this, "out of codec" );
+    (void)p_this;
+}
+
+
+static block_t *Encode( encoder_t *p_enc, subpicture_t *p_spu )
+{
+    subpicture_region_t *p_region;
+    block_t *p_block;
+    size_t len;
+
+    if( p_spu == NULL )
+        return NULL;
+
+    p_region = p_spu->p_region;
+    if( ( p_region == NULL )
+     || ( p_region->fmt.i_chroma != VLC_FOURCC('T','E','X','T') )
+     || ( p_region->psz_text == NULL ) )
+        return NULL;
+
+    /* This should already be UTF-8 encoded, so not much effort... */
+    len = strlen( p_region->psz_text );
+    p_block = block_New( p_enc, len );
+    memcpy( p_block->p_buffer, p_region->psz_text, len );
+
+    return p_block;
+}