2 * DVD subtitle decoding
3 * Copyright (c) 2005 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/mem.h"
28 /* parser definition */
29 typedef struct DVDSubParseContext
{
35 static av_cold
int dvdsub_parse_init(AVCodecParserContext
*s
)
40 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
)
45 DVDSubParseContext
*pc
= s
->priv_data
;
47 if (pc
->packet_index
== 0) {
48 if (buf_size
< 2 || AV_RB16(buf
) && buf_size
< 6) {
50 av_log(avctx
, AV_LOG_DEBUG
, "Parser input %d too small\n", buf_size
);
53 pc
->packet_len
= AV_RB16(buf
);
54 if (pc
->packet_len
== 0) /* HD-DVD subpicture packet */
55 pc
->packet_len
= AV_RB32(buf
+2);
56 av_freep(&pc
->packet
);
57 pc
->packet
= av_malloc(pc
->packet_len
);
60 if (pc
->packet_index
+ buf_size
<= pc
->packet_len
) {
61 memcpy(pc
->packet
+ pc
->packet_index
, buf
, buf_size
);
62 pc
->packet_index
+= buf_size
;
63 if (pc
->packet_index
>= pc
->packet_len
) {
64 *poutbuf
= pc
->packet
;
65 *poutbuf_size
= pc
->packet_len
;
79 static av_cold
void dvdsub_parse_close(AVCodecParserContext
*s
)
81 DVDSubParseContext
*pc
= s
->priv_data
;
82 av_freep(&pc
->packet
);
85 AVCodecParser ff_dvdsub_parser
= {
86 .codec_ids
= { AV_CODEC_ID_DVD_SUBTITLE
},
87 .priv_data_size
= sizeof(DVDSubParseContext
),
88 .parser_init
= dvdsub_parse_init
,
89 .parser_parse
= dvdsub_parse
,
90 .parser_close
= dvdsub_parse_close
,