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     subpicture_t *p_subpicture = subpicture_New( p_upd );
  42     p_subpicture->b_subtitle = true;
  43     return p_subpicture;
  44 }
  45
  46 static void spu_del_buffer( decoder_t *p_dec, subpicture_t *p_subpic )
  47 {
  48     VLC_UNUSED( p_dec );
  49     subpicture_Delete( p_subpic );
  50 }
  51 int transcode_spu_new( sout_stream_t *p_stream, sout_stream_id_t *id )
  52 {
  53     sout_stream_sys_t *p_sys = p_stream->p_sys;
  54
  55     /*
  56      * Open decoder
  57      */
  58
  59     /* Initialization of decoder structures */
  60     id->p_decoder->pf_decode_sub = NULL;
  61     id->p_decoder->pf_spu_buffer_new = spu_new_buffer;
  62     id->p_decoder->pf_spu_buffer_del = spu_del_buffer;
  63     id->p_decoder->p_owner = (decoder_owner_sys_t *)p_stream;
  64     /* id->p_decoder->p_cfg = p_sys->p_spu_cfg; */
  65
  66     id->p_decoder->p_module =
  67         module_need( id->p_decoder, "decoder", "$codec", false );
  68
  69     if( !id->p_decoder->p_module )
  70     {
  71         msg_Err( p_stream, "cannot find spu decoder" );
  72         return VLC_EGENERIC;
  73     }
  74
  75     if( !p_sys->b_soverlay )
  76     {
  77         /* Open encoder */
  78         /* Initialization of encoder format structures */
  79         es_format_Init( &id->p_encoder->fmt_in, id->p_decoder->fmt_in.i_cat,
  80                         id->p_decoder->fmt_in.i_codec );
  81
  82         id->p_encoder->p_cfg = p_sys->p_spu_cfg;
  83
  84         id->p_encoder->p_module =
  85             module_need( id->p_encoder, "encoder", p_sys->psz_senc, true );
  86
  87         if( !id->p_encoder->p_module )
  88         {
  89             module_unneed( id->p_decoder, id->p_decoder->p_module );
  90             msg_Err( p_stream, "cannot find spu encoder (%s)", p_sys->psz_senc );
  91             return VLC_EGENERIC;
  92         }
  93     }
  94
  95     if( !p_sys->p_spu )
  96         p_sys->p_spu = spu_Create( p_stream );
  97
  98     return VLC_SUCCESS;
  99 }
 100
 101 void transcode_spu_close( sout_stream_id_t *id)
 102 {
 103     /* Close decoder */
 104     if( id->p_decoder->p_module )
 105         module_unneed( id->p_decoder, id->p_decoder->p_module );
 106     if( id->p_decoder->p_description )
 107         vlc_meta_Delete( id->p_decoder->p_description );
 108
 109     /* Close encoder */
 110     if( id->p_encoder->p_module )
 111         module_unneed( id->p_encoder, id->p_encoder->p_module );
 112 }
 113
 114 int transcode_spu_process( sout_stream_t *p_stream,
 115                                   sout_stream_id_t *id,
 116                                   block_t *in, block_t **out )
 117 {
 118     sout_stream_sys_t *p_sys = p_stream->p_sys;
 119     subpicture_t *p_subpic;
 120     *out = NULL;
 121
 122     p_subpic = id->p_decoder->pf_decode_sub( id->p_decoder, &in );
 123     if( !p_subpic )
 124         return VLC_EGENERIC;
 125
 126     sout_UpdateStatistic( p_stream->p_sout, SOUT_STATISTIC_DECODED_SUBTITLE, 1 );
 127
 128     if( p_sys->b_master_sync && p_sys->i_master_drift )
 129     {
 130         p_subpic->i_start -= p_sys->i_master_drift;
 131         if( p_subpic->i_stop ) p_subpic->i_stop -= p_sys->i_master_drift;
 132     }
 133
 134     if( p_sys->b_soverlay )
 135     {
 136         spu_DisplaySubpicture( p_sys->p_spu, p_subpic );
 137     }
 138     else
 139     {
 140         block_t *p_block;
 141
 142         p_block = id->p_encoder->pf_encode_sub( id->p_encoder, p_subpic );
 143         spu_del_buffer( id->p_decoder, p_subpic );
 144         if( p_block )
 145         {
 146             block_ChainAppend( out, p_block );
 147             return VLC_SUCCESS;
 148         }
 149     }
 150
 151     return VLC_EGENERIC;
 152 }
 153
 154 bool transcode_spu_add( sout_stream_t *p_stream, es_format_t *p_fmt,
 155                         sout_stream_id_t *id )
 156 {
 157     sout_stream_sys_t *p_sys = p_stream->p_sys;
 158
 159     if( p_sys->i_scodec || p_sys->psz_senc )
 160     {
 161         msg_Dbg( p_stream, "creating subtitles transcoding from fcc=`%4.4s' "
 162                  "to fcc=`%4.4s'", (char*)&p_fmt->i_codec,
 163                  (char*)&p_sys->i_scodec );
 164
 165         /* Complete destination format */
 166         id->p_encoder->fmt_out.i_codec = p_sys->i_scodec;
 167
 168         /* build decoder -> filter -> encoder */
 169         if( transcode_spu_new( p_stream, id ) )
 170         {
 171             msg_Err( p_stream, "cannot create subtitles chain" );
 172             return false;
 173         }
 174
 175         /* open output stream */
 176         id->id = sout_StreamIdAdd( p_stream->p_next, &id->p_encoder->fmt_out );
 177         id->b_transcode = true;
 178
 179         if( !id->id )
 180         {
 181             transcode_spu_close( id );
 182             return false;
 183         }
 184     }
 185     else
 186     {
 187         assert( p_sys->b_soverlay );
 188         msg_Dbg( p_stream, "subtitles (fcc=`%4.4s') overlaying",
 189                  (char*)&p_fmt->i_codec );
 190
 191         id->b_transcode = true;
 192
 193         /* Build decoder -> filter -> overlaying chain */
 194         if( transcode_spu_new( p_stream, id ) )
 195         {
 196             msg_Err( p_stream, "cannot create subtitles chain" );
 197             return false;
 198         }
 199     }
 200
 201     return true;
 202 }