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 VLC authors and VideoLAN
   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 it
  13  * under the terms of the GNU Lesser General Public License as published by
  14  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Lesser General Public License
  23  * along with this program; if not, write to the Free Software Foundation,
  24  * 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 <vlc_modules.h>
  36 #include <assert.h>
  37
  38 static subpicture_t *spu_new_buffer( decoder_t *p_dec,
  39                                      const subpicture_updater_t *p_upd )
  40 {
  41     VLC_UNUSED( p_dec );
  42     subpicture_t *p_subpicture = subpicture_New( p_upd );
  43     if( likely(p_subpicture != NULL) )
  44         p_subpicture->b_subtitle = true;
  45     return p_subpicture;
  46 }
  47
  48 static void spu_del_buffer( decoder_t *p_dec, subpicture_t *p_subpic )
  49 {
  50     VLC_UNUSED( p_dec );
  51     subpicture_Delete( p_subpic );
  52 }
  53 int transcode_spu_new( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
  54 {
  55     sout_stream_sys_t *p_sys = p_stream->p_sys;
  56
  57     /*
  58      * Open decoder
  59      */
  60
  61     /* Initialization of decoder structures */
  62     id->p_decoder->pf_decode_sub = NULL;
  63     id->p_decoder->pf_spu_buffer_new = spu_new_buffer;
  64     id->p_decoder->pf_spu_buffer_del = spu_del_buffer;
  65     id->p_decoder->p_owner = (decoder_owner_sys_t *)p_stream;
  66     /* id->p_decoder->p_cfg = p_sys->p_spu_cfg; */
  67
  68     id->p_decoder->p_module =
  69         module_need( id->p_decoder, "decoder", "$codec", false );
  70
  71     if( !id->p_decoder->p_module )
  72     {
  73         msg_Err( p_stream, "cannot find spu decoder" );
  74         return VLC_EGENERIC;
  75     }
  76
  77     if( !p_sys->b_soverlay )
  78     {
  79         /* Open encoder */
  80         /* Initialization of encoder format structures */
  81         es_format_Init( &id->p_encoder->fmt_in, id->p_decoder->fmt_in.i_cat,
  82                         id->p_decoder->fmt_in.i_codec );
  83
  84         id->p_encoder->p_cfg = p_sys->p_spu_cfg;
  85
  86         id->p_encoder->p_module =
  87             module_need( id->p_encoder, "encoder", p_sys->psz_senc, true );
  88
  89         if( !id->p_encoder->p_module )
  90         {
  91             module_unneed( id->p_decoder, id->p_decoder->p_module );
  92             msg_Err( p_stream, "cannot find spu encoder (%s)", p_sys->psz_senc );
  93             return VLC_EGENERIC;
  94         }
  95     }
  96
  97     if( !p_sys->p_spu )
  98         p_sys->p_spu = spu_Create( p_stream );
  99
 100     return VLC_SUCCESS;
 101 }
 102
 103 void transcode_spu_close( sout_stream_t *p_stream, sout_stream_id_sys_t *id)
 104 {
 105     sout_stream_sys_t *p_sys = p_stream->p_sys;
 106     /* Close decoder */
 107     if( id->p_decoder->p_module )
 108         module_unneed( id->p_decoder, id->p_decoder->p_module );
 109     if( id->p_decoder->p_description )
 110         vlc_meta_Delete( id->p_decoder->p_description );
 111
 112     /* Close encoder */
 113     if( id->p_encoder->p_module )
 114         module_unneed( id->p_encoder, id->p_encoder->p_module );
 115
 116     if( p_sys->p_spu )
 117     {
 118         spu_Destroy( p_sys->p_spu );
 119         p_sys->p_spu = NULL;
 120     }
 121 }
 122
 123 int transcode_spu_process( sout_stream_t *p_stream,
 124                                   sout_stream_id_sys_t *id,
 125                                   block_t *in, block_t **out )
 126 {
 127     sout_stream_sys_t *p_sys = p_stream->p_sys;
 128     subpicture_t *p_subpic;
 129     *out = NULL;
 130
 131     p_subpic = id->p_decoder->pf_decode_sub( id->p_decoder, &in );
 132     if( !p_subpic )
 133     {
 134         /* We just don't have anything to handle now, go own*/
 135         return VLC_SUCCESS;
 136     }
 137
 138     if( p_sys->b_master_sync && p_sys->i_master_drift )
 139     {
 140         p_subpic->i_start -= p_sys->i_master_drift;
 141         if( p_subpic->i_stop ) p_subpic->i_stop -= p_sys->i_master_drift;
 142     }
 143
 144     if( p_sys->b_soverlay )
 145     {
 146         spu_PutSubpicture( p_sys->p_spu, p_subpic );
 147         return VLC_SUCCESS;
 148     }
 149     else
 150     {
 151         block_t *p_block;
 152
 153         p_block = id->p_encoder->pf_encode_sub( id->p_encoder, p_subpic );
 154         spu_del_buffer( id->p_decoder, p_subpic );
 155         if( p_block )
 156         {
 157             block_ChainAppend( out, p_block );
 158             return VLC_SUCCESS;
 159         }
 160     }
 161
 162     return VLC_EGENERIC;
 163 }
 164
 165 bool transcode_spu_add( sout_stream_t *p_stream, es_format_t *p_fmt,
 166                         sout_stream_id_sys_t *id )
 167 {
 168     sout_stream_sys_t *p_sys = p_stream->p_sys;
 169
 170     if( p_sys->i_scodec )
 171     {
 172         msg_Dbg( p_stream, "creating subtitle transcoding from fcc=`%4.4s' "
 173                  "to fcc=`%4.4s'", (char*)&p_fmt->i_codec,
 174                  (char*)&p_sys->i_scodec );
 175
 176         /* Complete destination format */
 177         id->p_encoder->fmt_out.i_codec = p_sys->i_scodec;
 178
 179         /* build decoder -> filter -> encoder */
 180         if( transcode_spu_new( p_stream, id ) )
 181         {
 182             msg_Err( p_stream, "cannot create subtitle chain" );
 183             return false;
 184         }
 185
 186         /* open output stream */
 187         id->id = sout_StreamIdAdd( p_stream->p_next, &id->p_encoder->fmt_out );
 188         id->b_transcode = true;
 189
 190         if( !id->id )
 191         {
 192             transcode_spu_close( p_stream, id );
 193             return false;
 194         }
 195     }
 196     else
 197     {
 198         assert( p_sys->b_soverlay );
 199         msg_Dbg( p_stream, "subtitle (fcc=`%4.4s') overlaying",
 200                  (char*)&p_fmt->i_codec );
 201
 202         id->b_transcode = true;
 203
 204         /* Build decoder -> filter -> overlaying chain */
 205         if( transcode_spu_new( p_stream, id ) )
 206         {
 207             msg_Err( p_stream, "cannot create subtitle chain" );
 208             return false;
 209         }
 210     }
 211
 212     return true;
 213 }