modules/codec/t140.c

   1 /*****************************************************************************
   2  * t140.c : trivial T.140 text encoder
   3  *****************************************************************************
   4  * Copyright © 2007 Rémi Denis-Courmont
   5  * $Id$
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  20  *****************************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include "config.h"
  24 #endif
  25
  26 #include <vlc_common.h>
  27 #include <vlc_plugin.h>
  28 #include <vlc_codec.h>
  29 #include <vlc_sout.h>
  30
  31 static int  Open ( vlc_object_t * );
  32 static void Close( vlc_object_t * );
  33
  34 vlc_module_begin ()
  35     set_description( N_("T.140 text encoder") )
  36     set_capability( "encoder", 100 )
  37     set_callbacks( Open, Close )
  38 vlc_module_end ()
  39
  40
  41 static block_t *Encode ( encoder_t *, subpicture_t * );
  42
  43
  44 static int Open( vlc_object_t *p_this )
  45 {
  46     encoder_t *p_enc = (encoder_t *)p_this;
  47
  48     switch( p_enc->fmt_out.i_codec )
  49     {
  50         case VLC_CODEC_SUBT:
  51             if( ( p_enc->fmt_out.subs.psz_encoding != NULL )
  52              && strcasecmp( p_enc->fmt_out.subs.psz_encoding, "utf8" )
  53              && strcasecmp( p_enc->fmt_out.subs.psz_encoding, "UTF-8" ) )
  54             {
  55                 msg_Err( p_this, "Only UTF-8 encoding supported" );
  56                 return VLC_EGENERIC;
  57             }
  58         case VLC_CODEC_ITU_T140:
  59             break;
  60
  61         default:
  62             if( !p_enc->b_force )
  63                 return VLC_EGENERIC;
  64
  65             p_enc->fmt_out.i_codec = VLC_CODEC_ITU_T140;
  66     }
  67
  68     p_enc->p_sys = NULL;
  69
  70     p_enc->pf_encode_sub = Encode;
  71     p_enc->fmt_out.i_cat = SPU_ES;
  72     return VLC_SUCCESS;
  73 }
  74
  75
  76 static void Close( vlc_object_t *p_this )
  77 {
  78     (void)p_this;
  79 }
  80
  81
  82 static block_t *Encode( encoder_t *p_enc, subpicture_t *p_spu )
  83 {
  84     VLC_UNUSED( p_enc );
  85
  86     subpicture_region_t *p_region;
  87     block_t *p_block;
  88     size_t len;
  89
  90     if( p_spu == NULL )
  91         return NULL;
  92
  93     p_region = p_spu->p_region;
  94     if( ( p_region == NULL )
  95      || ( p_region->fmt.i_chroma != VLC_CODEC_TEXT )
  96      || ( p_region->psz_text == NULL ) )
  97         return NULL;
  98
  99     /* This should already be UTF-8 encoded, so not much effort... */
 100     len = strlen( p_region->psz_text );
 101     p_block = block_New( p_enc, len );
 102     memcpy( p_block->p_buffer, p_region->psz_text, len );
 103
 104     p_block->i_pts = p_block->i_dts = p_spu->i_start;
 105     if( !p_spu->b_ephemer && ( p_spu->i_stop > p_spu->i_start ) )
 106         p_block->i_length = p_spu->i_stop - p_spu->i_start;
 107
 108     return p_block;
 109 }