1 /*****************************************************************************
2 * spudec.c : SPU decoder thread
3 *****************************************************************************
4 * Copyright (C) 2000-2001, 2006 the VideoLAN team
7 * Authors: Sam Hocevar <sam@zoy.org>
8 * Laurent Aimar <fenrir@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_codec.h>
38 /*****************************************************************************
40 *****************************************************************************/
41 static int DecoderOpen ( vlc_object_t
* );
42 static int PacketizerOpen( vlc_object_t
* );
43 static void Close ( vlc_object_t
* );
45 #define DVDSUBTRANS_DISABLE_TEXT N_("Disable DVD subtitle transparency")
46 #define DVDSUBTRANS_DISABLE_LONGTEXT N_("Removes all transparency effects " \
47 "used in DVD subtitles.")
50 set_description( N_("DVD subtitles decoder") )
51 set_shortname( N_("DVD subtitles") )
52 set_capability( "decoder", 75 )
53 set_category( CAT_INPUT
)
54 set_subcategory( SUBCAT_INPUT_SCODEC
)
55 set_callbacks( DecoderOpen
, Close
)
57 add_bool( "dvdsub-transparency", false, NULL
,
58 DVDSUBTRANS_DISABLE_TEXT
, DVDSUBTRANS_DISABLE_LONGTEXT
, true )
60 set_description( N_("DVD subtitles packetizer") )
61 set_capability( "packetizer", 50 )
62 set_callbacks( PacketizerOpen
, Close
)
65 /*****************************************************************************
67 *****************************************************************************/
68 static block_t
* Reassemble( decoder_t
*, block_t
** );
69 static subpicture_t
* Decode ( decoder_t
*, block_t
** );
70 static block_t
* Packetize ( decoder_t
*, block_t
** );
72 /*****************************************************************************
74 *****************************************************************************
75 * Tries to launch a decoder and return score so that the interface is able
77 *****************************************************************************/
78 static int DecoderOpen( vlc_object_t
*p_this
)
80 decoder_t
*p_dec
= (decoder_t
*)p_this
;
83 if( p_dec
->fmt_in
.i_codec
!= VLC_CODEC_SPU
)
86 p_dec
->p_sys
= p_sys
= malloc( sizeof( decoder_sys_t
) );
88 p_sys
->b_packetizer
= false;
89 p_sys
->b_disabletrans
= var_InheritBool( p_dec
, "dvdsub-transparency" );
90 p_sys
->i_spu_size
= 0;
92 p_sys
->p_block
= NULL
;
94 es_format_Init( &p_dec
->fmt_out
, SPU_ES
, VLC_CODEC_SPU
);
96 p_dec
->pf_decode_sub
= Decode
;
97 p_dec
->pf_packetize
= NULL
;
102 /*****************************************************************************
104 *****************************************************************************
105 * Tries to launch a decoder and return score so that the interface is able
107 *****************************************************************************/
108 static int PacketizerOpen( vlc_object_t
*p_this
)
110 decoder_t
*p_dec
= (decoder_t
*)p_this
;
112 if( DecoderOpen( p_this
) )
116 p_dec
->pf_packetize
= Packetize
;
117 p_dec
->p_sys
->b_packetizer
= true;
118 es_format_Copy( &p_dec
->fmt_out
, &p_dec
->fmt_in
);
119 p_dec
->fmt_out
.i_codec
= VLC_CODEC_SPU
;
124 /*****************************************************************************
126 *****************************************************************************/
127 static void Close( vlc_object_t
*p_this
)
129 decoder_t
*p_dec
= (decoder_t
*)p_this
;
130 decoder_sys_t
*p_sys
= p_dec
->p_sys
;
134 block_ChainRelease( p_sys
->p_block
);
140 /*****************************************************************************
142 *****************************************************************************/
143 static subpicture_t
*Decode( decoder_t
*p_dec
, block_t
**pp_block
)
145 decoder_sys_t
*p_sys
= p_dec
->p_sys
;
146 block_t
*p_spu_block
;
149 p_spu_block
= Reassemble( p_dec
, pp_block
);
156 /* FIXME: what the, we shouldn’t need to allocate 64k of buffer --sam. */
157 p_sys
->i_spu
= block_ChainExtract( p_spu_block
, p_sys
->buffer
, 65536 );
158 p_sys
->i_pts
= p_spu_block
->i_pts
;
159 block_ChainRelease( p_spu_block
);
161 /* Parse and decode */
162 p_spu
= ParsePacket( p_dec
);
165 p_sys
->i_spu_size
= 0;
166 p_sys
->i_rle_size
= 0;
168 p_sys
->p_block
= NULL
;
173 /*****************************************************************************
175 *****************************************************************************/
176 static block_t
*Packetize( decoder_t
*p_dec
, block_t
**pp_block
)
178 decoder_sys_t
*p_sys
= p_dec
->p_sys
;
179 block_t
*p_spu
= Reassemble( p_dec
, pp_block
);
186 p_spu
->i_dts
= p_spu
->i_pts
;
190 p_sys
->i_spu_size
= 0;
191 p_sys
->i_rle_size
= 0;
193 p_sys
->p_block
= NULL
;
195 return block_ChainGather( p_spu
);
198 /*****************************************************************************
200 *****************************************************************************/
201 static block_t
*Reassemble( decoder_t
*p_dec
, block_t
**pp_block
)
203 decoder_sys_t
*p_sys
= p_dec
->p_sys
;
206 if( pp_block
== NULL
|| *pp_block
== NULL
) return NULL
;
210 if( p_sys
->i_spu_size
<= 0 &&
211 ( p_block
->i_pts
<= VLC_TS_INVALID
|| p_block
->i_buffer
< 4 ) )
213 msg_Dbg( p_dec
, "invalid starting packet (size < 4 or pts <=0)" );
214 msg_Dbg( p_dec
, "spu size: %d, i_pts: %"PRId64
" i_buffer: %zu",
215 p_sys
->i_spu_size
, p_block
->i_pts
, p_block
->i_buffer
);
216 block_Release( p_block
);
220 block_ChainAppend( &p_sys
->p_block
, p_block
);
221 p_sys
->i_spu
+= p_block
->i_buffer
;
223 if( p_sys
->i_spu_size
<= 0 )
225 p_sys
->i_spu_size
= ( p_block
->p_buffer
[0] << 8 )|
226 p_block
->p_buffer
[1];
227 p_sys
->i_rle_size
= ( ( p_block
->p_buffer
[2] << 8 )|
228 p_block
->p_buffer
[3] ) - 4;
230 /* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
231 p_sys->i_spu_size, p_sys->i_rle_size ); */
233 if( p_sys
->i_spu_size
<= 0 || p_sys
->i_rle_size
>= p_sys
->i_spu_size
)
235 p_sys
->i_spu_size
= 0;
236 p_sys
->i_rle_size
= 0;
238 p_sys
->p_block
= NULL
;
240 block_Release( p_block
);
245 if( p_sys
->i_spu
>= p_sys
->i_spu_size
)
247 /* We have a complete sub */
248 if( p_sys
->i_spu
> p_sys
->i_spu_size
)
249 msg_Dbg( p_dec
, "SPU packets size=%d should be %d",
250 p_sys
->i_spu
, p_sys
->i_spu_size
);
252 return p_sys
->p_block
;