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     p_subpicture->b_subtitle = true;
  44     return p_subpicture;
  45 }
  46
  47 static void spu_del_buffer( decoder_t *p_dec, subpicture_t *p_subpic )
  48 {
  49     VLC_UNUSED( p_dec );
  50     subpicture_Delete( p_subpic );
  51 }
  52 int transcode_spu_new( sout_stream_t *p_stream, sout_stream_id_t *id )
  53 {
  54     sout_stream_sys_t *p_sys = p_stream->p_sys;
  55
  56     /*
  57      * Open decoder
  58      */
  59
  60     /* Initialization of decoder structures */
  61     id->p_decoder->pf_decode_sub = NULL;
  62     id->p_decoder->pf_spu_buffer_new = spu_new_buffer;
  63     id->p_decoder->pf_spu_buffer_del = spu_del_buffer;
  64     id->p_decoder->p_owner = (decoder_owner_sys_t *)p_stream;
  65     /* id->p_decoder->p_cfg = p_sys->p_spu_cfg; */
  66
  67     id->p_decoder->p_module =
  68         module_need( id->p_decoder, "decoder", "$codec", false );
  69
  70     if( !id->p_decoder->p_module )
  71     {
  72         msg_Err( p_stream, "cannot find spu decoder" );
  73         return VLC_EGENERIC;
  74     }
  75
  76     if( !p_sys->b_soverlay )
  77     {
  78         /* Open encoder */
  79         /* Initialization of encoder format structures */
  80         es_format_Init( &id->p_encoder->fmt_in, id->p_decoder->fmt_in.i_cat,
  81                         id->p_decoder->fmt_in.i_codec );
  82
  83         id->p_encoder->p_cfg = p_sys->p_spu_cfg;
  84
  85         id->p_encoder->p_module =
  86             module_need( id->p_encoder, "encoder", p_sys->psz_senc, true );
  87
  88         if( !id->p_encoder->p_module )
  89         {
  90             module_unneed( id->p_decoder, id->p_decoder->p_module );
  91             msg_Err( p_stream, "cannot find spu encoder (%s)", p_sys->psz_senc );
  92             return VLC_EGENERIC;
  93         }
  94     }
  95
  96     if( !p_sys->p_spu )
  97         p_sys->p_spu = spu_Create( p_stream );
  98
  99     return VLC_SUCCESS;
 100 }
 101
 102 void transcode_spu_close( sout_stream_t *p_stream, sout_stream_id_t *id)
 103 {
 104     sout_stream_sys_t *p_sys = p_stream->p_sys;
 105     /* Close decoder */
 106     if( id->p_decoder->p_module )
 107         module_unneed( id->p_decoder, id->p_decoder->p_module );
 108     if( id->p_decoder->p_description )
 109         vlc_meta_Delete( id->p_decoder->p_description );
 110
 111     /* Close encoder */
 112     if( id->p_encoder->p_module )
 113         module_unneed( id->p_encoder, id->p_encoder->p_module );
 114
 115     if( p_sys->p_spu )
 116     {
 117         spu_Destroy( p_sys->p_spu );
 118         p_sys->p_spu = NULL;
 119     }
 120 }
 121
 122 int transcode_spu_process( sout_stream_t *p_stream,
 123                                   sout_stream_id_t *id,
 124                                   block_t *in, block_t **out )
 125 {
 126     sout_stream_sys_t *p_sys = p_stream->p_sys;
 127     subpicture_t *p_subpic;
 128     *out = NULL;
 129
 130     p_subpic = id->p_decoder->pf_decode_sub( id->p_decoder, &in );
 131     if( !p_subpic )
 132         return VLC_EGENERIC;
 133
 134     if( p_sys->b_master_sync && p_sys->i_master_drift )
 135     {
 136         p_subpic->i_start -= p_sys->i_master_drift;
 137         if( p_subpic->i_stop ) p_subpic->i_stop -= p_sys->i_master_drift;
 138     }
 139
 140     if( p_sys->b_soverlay )
 141     {
 142         spu_PutSubpicture( p_sys->p_spu, p_subpic );
 143     }
 144     else
 145     {
 146         block_t *p_block;
 147
 148         p_block = id->p_encoder->pf_encode_sub( id->p_encoder, p_subpic );
 149         spu_del_buffer( id->p_decoder, p_subpic );
 150         if( p_block )
 151         {
 152             block_ChainAppend( out, p_block );
 153             return VLC_SUCCESS;
 154         }
 155     }
 156
 157     return VLC_EGENERIC;
 158 }
 159
 160 bool transcode_spu_add( sout_stream_t *p_stream, es_format_t *p_fmt,
 161                         sout_stream_id_t *id )
 162 {
 163     sout_stream_sys_t *p_sys = p_stream->p_sys;
 164
 165     if( p_sys->i_scodec || p_sys->psz_senc )
 166     {
 167         msg_Dbg( p_stream, "creating subtitle transcoding from fcc=`%4.4s' "
 168                  "to fcc=`%4.4s'", (char*)&p_fmt->i_codec,
 169                  (char*)&p_sys->i_scodec );
 170
 171         /* Complete destination format */
 172         id->p_encoder->fmt_out.i_codec = p_sys->i_scodec;
 173
 174         /* build decoder -> filter -> encoder */
 175         if( transcode_spu_new( p_stream, id ) )
 176         {
 177             msg_Err( p_stream, "cannot create subtitle chain" );
 178             return false;
 179         }
 180
 181         /* open output stream */
 182         id->id = sout_StreamIdAdd( p_stream->p_next, &id->p_encoder->fmt_out );
 183         id->b_transcode = true;
 184
 185         if( !id->id )
 186         {
 187             transcode_spu_close( p_stream, id );
 188             return false;
 189         }
 190     }
 191     else
 192     {
 193         assert( p_sys->b_soverlay );
 194         msg_Dbg( p_stream, "subtitle (fcc=`%4.4s') overlaying",
 195                  (char*)&p_fmt->i_codec );
 196
 197         id->b_transcode = true;
 198
 199         /* Build decoder -> filter -> overlaying chain */
 200         if( transcode_spu_new( p_stream, id ) )
 201         {
 202             msg_Err( p_stream, "cannot create subtitle chain" );
 203             return false;
 204         }
 205     }
 206
 207     return true;
 208 }