git.sesse.net Git - vlc/blob - modules/stream_out/transcode/spu.c

   1 /*****************************************************************************
   2  * spu.c: transcoding stream output module (spu)
   3  *****************************************************************************
   4  * Copyright (C) 2003-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Gildas Bazin <gbazin@videolan.org>
   9  *          Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
  10  *          Antoine Cellerier <dionoea at videolan dot org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30
  31 #include "transcode.h"
  32
  33 #include <vlc_meta.h>
  34 #include <vlc_spu.h>
  35 #include <assert.h>
  36
  37 static subpicture_t *spu_new_buffer( decoder_t *p_dec,
  38                                      const subpicture_updater_t *p_upd )
  39 {
  40     VLC_UNUSED( p_dec );
  41     return subpicture_New( p_upd );
  42 }
  43
  44 static void spu_del_buffer( decoder_t *p_dec, subpicture_t *p_subpic )
  45 {
  46     VLC_UNUSED( p_dec );
  47     subpicture_Delete( p_subpic );
  48 }
  49 int transcode_spu_new( sout_stream_t *p_stream, sout_stream_id_t *id )
  50 {
  51     sout_stream_sys_t *p_sys = p_stream->p_sys;
  52
  53     /*
  54      * Open decoder
  55      */
  56
  57     /* Initialization of decoder structures */
  58     id->p_decoder->pf_decode_sub = NULL;
  59     id->p_decoder->pf_spu_buffer_new = spu_new_buffer;
  60     id->p_decoder->pf_spu_buffer_del = spu_del_buffer;
  61     id->p_decoder->p_owner = (decoder_owner_sys_t *)p_stream;
  62     /* id->p_decoder->p_cfg = p_sys->p_spu_cfg; */
  63
  64     id->p_decoder->p_module =
  65         module_need( id->p_decoder, "decoder", "$codec", false );
  66
  67     if( !id->p_decoder->p_module )
  68     {
  69         msg_Err( p_stream, "cannot find spu decoder" );
  70         return VLC_EGENERIC;
  71     }
  72
  73     if( !p_sys->b_soverlay )
  74     {
  75         /* Open encoder */
  76         /* Initialization of encoder format structures */
  77         es_format_Init( &id->p_encoder->fmt_in, id->p_decoder->fmt_in.i_cat,
  78                         id->p_decoder->fmt_in.i_codec );
  79
  80         id->p_encoder->p_cfg = p_sys->p_spu_cfg;
  81
  82         id->p_encoder->p_module =
  83             module_need( id->p_encoder, "encoder", p_sys->psz_senc, true );
  84
  85         if( !id->p_encoder->p_module )
  86         {
  87             module_unneed( id->p_decoder, id->p_decoder->p_module );
  88             msg_Err( p_stream, "cannot find spu encoder (%s)", p_sys->psz_senc );
  89             return VLC_EGENERIC;
  90         }
  91     }
  92
  93     if( !p_sys->p_spu )
  94         p_sys->p_spu = spu_Create( p_stream );
  95
  96     return VLC_SUCCESS;
  97 }
  98
  99 void transcode_spu_close( sout_stream_id_t *id)
 100 {
 101     /* Close decoder */
 102     if( id->p_decoder->p_module )
 103         module_unneed( id->p_decoder, id->p_decoder->p_module );
 104     if( id->p_decoder->p_description )
 105         vlc_meta_Delete( id->p_decoder->p_description );
 106
 107     /* Close encoder */
 108     if( id->p_encoder->p_module )
 109         module_unneed( id->p_encoder, id->p_encoder->p_module );
 110 }
 111
 112 int transcode_spu_process( sout_stream_t *p_stream,
 113                                   sout_stream_id_t *id,
 114                                   block_t *in, block_t **out )
 115 {
 116     sout_stream_sys_t *p_sys = p_stream->p_sys;
 117     subpicture_t *p_subpic;
 118     *out = NULL;
 119
 120     p_subpic = id->p_decoder->pf_decode_sub( id->p_decoder, &in );
 121     if( !p_subpic )
 122         return VLC_EGENERIC;
 123
 124     sout_UpdateStatistic( p_stream->p_sout, SOUT_STATISTIC_DECODED_SUBTITLE, 1 );
 125
 126     if( p_sys->b_master_sync && p_sys->i_master_drift )
 127     {
 128         p_subpic->i_start -= p_sys->i_master_drift;
 129         if( p_subpic->i_stop ) p_subpic->i_stop -= p_sys->i_master_drift;
 130     }
 131
 132     if( p_sys->b_soverlay )
 133     {
 134         spu_DisplaySubpicture( p_sys->p_spu, p_subpic );
 135     }
 136     else
 137     {
 138         block_t *p_block;
 139
 140         p_block = id->p_encoder->pf_encode_sub( id->p_encoder, p_subpic );
 141         spu_del_buffer( id->p_decoder, p_subpic );
 142         if( p_block )
 143         {
 144             block_ChainAppend( out, p_block );
 145             return VLC_SUCCESS;
 146         }
 147     }
 148
 149     return VLC_EGENERIC;
 150 }
 151
 152 bool transcode_spu_add( sout_stream_t *p_stream, es_format_t *p_fmt,
 153                         sout_stream_id_t *id )
 154 {
 155     sout_stream_sys_t *p_sys = p_stream->p_sys;
 156
 157     if( p_sys->i_scodec || p_sys->psz_senc )
 158     {
 159         msg_Dbg( p_stream, "creating subtitles transcoding from fcc=`%4.4s' "
 160                  "to fcc=`%4.4s'", (char*)&p_fmt->i_codec,
 161                  (char*)&p_sys->i_scodec );
 162
 163         /* Complete destination format */
 164         id->p_encoder->fmt_out.i_codec = p_sys->i_scodec;
 165
 166         /* build decoder -> filter -> encoder */
 167         if( transcode_spu_new( p_stream, id ) )
 168         {
 169             msg_Err( p_stream, "cannot create subtitles chain" );
 170             return false;
 171         }
 172
 173         /* open output stream */
 174         id->id = sout_StreamIdAdd( p_stream->p_next, &id->p_encoder->fmt_out );
 175         id->b_transcode = true;
 176
 177         if( !id->id )
 178         {
 179             transcode_spu_close( id );
 180             return false;
 181         }
 182     }
 183     else
 184     {
 185         assert( p_sys->b_soverlay );
 186         msg_Dbg( p_stream, "subtitles (fcc=`%4.4s') overlaying",
 187                  (char*)&p_fmt->i_codec );
 188
 189         id->b_transcode = true;
 190
 191         /* Build decoder -> filter -> overlaying chain */
 192         if( transcode_spu_new( p_stream, id ) )
 193         {
 194             msg_Err( p_stream, "cannot create subtitles chain" );
 195             return false;
 196         }
 197     }
 198
 199     return true;
 200 }