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2ba45a60 DM |
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 | static av_cold int dvdsub_parse_init(AVCodecParserContext *s) | |
36 | { | |
37 | return 0; | |
38 | } | |
39 | ||
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) | |
44 | { | |
45 | DVDSubParseContext *pc = s->priv_data; | |
46 | ||
47 | if (pc->packet_index == 0) { | |
48 | if (buf_size < 2 || AV_RB16(buf) && buf_size < 6) { | |
49 | if (buf_size) | |
50 | av_log(avctx, AV_LOG_DEBUG, "Parser input %d too small\n", buf_size); | |
51 | return buf_size; | |
52 | } | |
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); | |
58 | } | |
59 | if (pc->packet) { | |
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; | |
66 | pc->packet_index = 0; | |
67 | return buf_size; | |
68 | } | |
69 | } else { | |
70 | /* erroneous size */ | |
71 | pc->packet_index = 0; | |
72 | } | |
73 | } | |
74 | *poutbuf = NULL; | |
75 | *poutbuf_size = 0; | |
76 | return buf_size; | |
77 | } | |
78 | ||
79 | static av_cold void dvdsub_parse_close(AVCodecParserContext *s) | |
80 | { | |
81 | DVDSubParseContext *pc = s->priv_data; | |
82 | av_freep(&pc->packet); | |
83 | } | |
84 | ||
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, | |
91 | }; |