Main Page
Related Pages
Modules
Data Structures
Files
Examples
File List
Globals
libavcodec
dvdsub_parser.c
Go to the documentation of this file.
1
/*
2
* DVD subtitle decoding
3
* Copyright (c) 2005 Fabrice Bellard
4
*
5
* This file is part of Libav.
6
*
7
* Libav is free software; you can redistribute it and/or
8
* modify it under the terms of the GNU Lesser General Public
9
* License as published by the Free Software Foundation; either
10
* version 2.1 of the License, or (at your option) any later version.
11
*
12
* Libav is distributed in the hope that it will be useful,
13
* but WITHOUT ANY WARRANTY; without even the implied warranty of
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
* Lesser General Public License for more details.
16
*
17
* You should have received a copy of the GNU Lesser General Public
18
* License along with Libav; if not, write to the Free Software
19
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
*/
21
22
#include "
libavutil/intreadwrite.h
"
23
#include "
avcodec.h
"
24
25
/* parser definition */
26
typedef
struct
DVDSubParseContext
{
27
uint8_t *
packet
;
28
int
packet_len
;
29
int
packet_index
;
30
}
DVDSubParseContext
;
31
32
static
av_cold
int
dvdsub_parse_init
(
AVCodecParserContext
*s)
33
{
34
return
0;
35
}
36
37
static
int
dvdsub_parse
(
AVCodecParserContext
*s,
38
AVCodecContext
*avctx,
39
const
uint8_t **poutbuf,
int
*poutbuf_size,
40
const
uint8_t *buf,
int
buf_size)
41
{
42
DVDSubParseContext
*pc = s->
priv_data
;
43
44
if
(pc->
packet_index
== 0) {
45
if
(buf_size < 2)
46
return
0;
47
pc->
packet_len
=
AV_RB16
(buf);
48
if
(pc->
packet_len
== 0)
/* HD-DVD subpicture packet */
49
pc->
packet_len
=
AV_RB32
(buf+2);
50
av_freep
(&pc->
packet
);
51
pc->
packet
=
av_malloc
(pc->
packet_len
);
52
}
53
if
(pc->
packet
) {
54
if
(pc->
packet_index
+ buf_size <= pc->packet_len) {
55
memcpy(pc->
packet
+ pc->
packet_index
, buf, buf_size);
56
pc->
packet_index
+= buf_size;
57
if
(pc->
packet_index
>= pc->
packet_len
) {
58
*poutbuf = pc->
packet
;
59
*poutbuf_size = pc->
packet_len
;
60
pc->
packet_index
= 0;
61
return
buf_size;
62
}
63
}
else
{
64
/* erroneous size */
65
pc->
packet_index
= 0;
66
}
67
}
68
*poutbuf =
NULL
;
69
*poutbuf_size = 0;
70
return
buf_size;
71
}
72
73
static
av_cold
void
dvdsub_parse_close
(
AVCodecParserContext
*s)
74
{
75
DVDSubParseContext
*pc = s->
priv_data
;
76
av_freep
(&pc->
packet
);
77
}
78
79
AVCodecParser
ff_dvdsub_parser
= {
80
.
codec_ids
= {
CODEC_ID_DVD_SUBTITLE
},
81
.priv_data_size =
sizeof
(
DVDSubParseContext
),
82
.parser_init =
dvdsub_parse_init
,
83
.parser_parse =
dvdsub_parse
,
84
.parser_close =
dvdsub_parse_close
,
85
};