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 #define VLC_MODULE_LICENSE VLC_LICENSE_GPL_2_PLUS
  27 #include <vlc_common.h>
  28 #include <vlc_plugin.h>
  29 #include <vlc_codec.h>
  30 #include <vlc_sout.h>
  31
  32 static int  Open ( vlc_object_t * );
  33 static void Close( vlc_object_t * );
  34
  35 vlc_module_begin ()
  36     set_description( N_("T.140 text encoder") )
  37     set_capability( "encoder", 100 )
  38     set_callbacks( Open, Close )
  39 vlc_module_end ()
  40
  41
  42 static block_t *Encode ( encoder_t *, subpicture_t * );
  43
  44
  45 static int Open( vlc_object_t *p_this )
  46 {
  47     encoder_t *p_enc = (encoder_t *)p_this;
  48
  49     switch( p_enc->fmt_out.i_codec )
  50     {
  51         case VLC_CODEC_SUBT:
  52             if( ( p_enc->fmt_out.subs.psz_encoding != NULL )
  53              && strcasecmp( p_enc->fmt_out.subs.psz_encoding, "utf8" )
  54              && strcasecmp( p_enc->fmt_out.subs.psz_encoding, "UTF-8" ) )
  55             {
  56                 msg_Err( p_this, "Only UTF-8 encoding supported" );
  57                 return VLC_EGENERIC;
  58             }
  59         case VLC_CODEC_ITU_T140:
  60             break;
  61
  62         default:
  63             if( !p_enc->obj.force )
  64                 return VLC_EGENERIC;
  65
  66             p_enc->fmt_out.i_codec = VLC_CODEC_ITU_T140;
  67     }
  68
  69     p_enc->p_sys = NULL;
  70
  71     p_enc->pf_encode_sub = Encode;
  72     p_enc->fmt_out.i_cat = SPU_ES;
  73     return VLC_SUCCESS;
  74 }
  75
  76
  77 static void Close( vlc_object_t *p_this )
  78 {
  79     (void)p_this;
  80 }
  81
  82
  83 static block_t *Encode( encoder_t *p_enc, subpicture_t *p_spu )
  84 {
  85     VLC_UNUSED( p_enc );
  86
  87     subpicture_region_t *p_region;
  88     block_t *p_block;
  89     size_t len;
  90
  91     if( p_spu == NULL )
  92         return NULL;
  93
  94     p_region = p_spu->p_region;
  95     if( ( p_region == NULL )
  96      || ( p_region->fmt.i_chroma != VLC_CODEC_TEXT )
  97      || ( p_region->p_text == NULL )
  98      || ( p_region->p_text->psz_text == NULL) )
  99         return NULL;
 100
 101     /* This should already be UTF-8 encoded, so not much effort... */
 102     len = strlen( p_region->p_text->psz_text );
 103     p_block = block_Alloc( len );
 104     memcpy( p_block->p_buffer, p_region->p_text->psz_text, len );
 105
 106     p_block->i_pts = p_block->i_dts = p_spu->i_start;
 107     if( !p_spu->b_ephemer && ( p_spu->i_stop > p_spu->i_start ) )
 108         p_block->i_length = p_spu->i_stop - p_spu->i_start;
 109
 110     return p_block;
 111 }