1 |
|
|
/* |
2 |
|
|
* DVD subtitle decoding |
3 |
|
|
* Copyright (c) 2005 Fabrice Bellard |
4 |
|
|
* |
5 |
|
|
* This file is part of FFmpeg. |
6 |
|
|
* |
7 |
|
|
* FFmpeg 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 |
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software |
19 |
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 |
|
|
*/ |
21 |
|
|
|
22 |
|
|
#include <string.h> |
23 |
|
|
|
24 |
|
|
#include "libavutil/intreadwrite.h" |
25 |
|
|
#include "libavutil/mem.h" |
26 |
|
|
#include "avcodec.h" |
27 |
|
|
|
28 |
|
|
/* parser definition */ |
29 |
|
|
typedef struct DVDSubParseContext { |
30 |
|
|
uint8_t *packet; |
31 |
|
|
int packet_len; |
32 |
|
|
int packet_index; |
33 |
|
|
} DVDSubParseContext; |
34 |
|
|
|
35 |
|
7 |
static av_cold int dvdsub_parse_init(AVCodecParserContext *s) |
36 |
|
|
{ |
37 |
|
7 |
return 0; |
38 |
|
|
} |
39 |
|
|
|
40 |
|
12 |
static int dvdsub_parse(AVCodecParserContext *s, |
41 |
|
|
AVCodecContext *avctx, |
42 |
|
|
const uint8_t **poutbuf, int *poutbuf_size, |
43 |
|
|
const uint8_t *buf, int buf_size) |
44 |
|
|
{ |
45 |
|
12 |
DVDSubParseContext *pc = s->priv_data; |
46 |
|
|
|
47 |
|
12 |
*poutbuf = buf; |
48 |
|
12 |
*poutbuf_size = buf_size; |
49 |
|
|
|
50 |
✓✓ |
12 |
if (pc->packet_index == 0) { |
51 |
✓✓✓✗
✗✓ |
4 |
if (buf_size < 2 || AV_RB16(buf) && buf_size < 6) { |
52 |
✗✓ |
2 |
if (buf_size) |
53 |
|
|
av_log(avctx, AV_LOG_DEBUG, "Parser input %d too small\n", buf_size); |
54 |
|
2 |
return buf_size; |
55 |
|
|
} |
56 |
|
2 |
pc->packet_len = AV_RB16(buf); |
57 |
✗✓ |
2 |
if (pc->packet_len == 0) /* HD-DVD subpicture packet */ |
58 |
|
|
pc->packet_len = AV_RB32(buf+2); |
59 |
|
2 |
av_freep(&pc->packet); |
60 |
✗✓ |
2 |
if ((unsigned)pc->packet_len > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) { |
61 |
|
|
av_log(avctx, AV_LOG_ERROR, "packet length %d is invalid\n", pc->packet_len); |
62 |
|
|
return buf_size; |
63 |
|
|
} |
64 |
|
2 |
pc->packet = av_malloc(pc->packet_len + AV_INPUT_BUFFER_PADDING_SIZE); |
65 |
|
|
} |
66 |
✓✗ |
10 |
if (pc->packet) { |
67 |
✓✗ |
10 |
if (pc->packet_index + buf_size <= pc->packet_len) { |
68 |
|
10 |
memcpy(pc->packet + pc->packet_index, buf, buf_size); |
69 |
|
10 |
pc->packet_index += buf_size; |
70 |
✓✓ |
10 |
if (pc->packet_index >= pc->packet_len) { |
71 |
|
2 |
*poutbuf = pc->packet; |
72 |
|
2 |
*poutbuf_size = pc->packet_len; |
73 |
|
2 |
pc->packet_index = 0; |
74 |
|
2 |
return buf_size; |
75 |
|
|
} |
76 |
|
|
} else { |
77 |
|
|
/* erroneous size */ |
78 |
|
|
pc->packet_index = 0; |
79 |
|
|
} |
80 |
|
|
} |
81 |
|
8 |
*poutbuf = NULL; |
82 |
|
8 |
*poutbuf_size = 0; |
83 |
|
8 |
return buf_size; |
84 |
|
|
} |
85 |
|
|
|
86 |
|
7 |
static av_cold void dvdsub_parse_close(AVCodecParserContext *s) |
87 |
|
|
{ |
88 |
|
7 |
DVDSubParseContext *pc = s->priv_data; |
89 |
|
7 |
av_freep(&pc->packet); |
90 |
|
7 |
} |
91 |
|
|
|
92 |
|
|
AVCodecParser ff_dvdsub_parser = { |
93 |
|
|
.codec_ids = { AV_CODEC_ID_DVD_SUBTITLE }, |
94 |
|
|
.priv_data_size = sizeof(DVDSubParseContext), |
95 |
|
|
.parser_init = dvdsub_parse_init, |
96 |
|
|
.parser_parse = dvdsub_parse, |
97 |
|
|
.parser_close = dvdsub_parse_close, |
98 |
|
|
}; |