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1 | /* |
2 | * DVD navigation block parser for FFmpeg | |
3 | * Copyright (c) 2013 The FFmpeg Project | |
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 | #include "avcodec.h" | |
22 | #include "get_bits.h" | |
23 | #include "parser.h" | |
24 | ||
25 | #define PCI_SIZE 980 | |
26 | #define DSI_SIZE 1018 | |
27 | ||
28 | /* parser definition */ | |
29 | typedef struct DVDNavParseContext { | |
30 | uint32_t lba; | |
31 | uint8_t buffer[PCI_SIZE+DSI_SIZE]; | |
32 | int copied; | |
33 | } DVDNavParseContext; | |
34 | ||
35 | static av_cold int dvd_nav_parse_init(AVCodecParserContext *s) | |
36 | { | |
37 | DVDNavParseContext *pc = s->priv_data; | |
38 | ||
39 | pc->lba = 0xFFFFFFFF; | |
40 | pc->copied = 0; | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static int dvd_nav_parse(AVCodecParserContext *s, | |
45 | AVCodecContext *avctx, | |
46 | const uint8_t **poutbuf, int *poutbuf_size, | |
47 | const uint8_t *buf, int buf_size) | |
48 | { | |
49 | DVDNavParseContext *pc1 = s->priv_data; | |
50 | int lastPacket = 0; | |
51 | int valid = 0; | |
52 | ||
53 | s->pict_type = AV_PICTURE_TYPE_NONE; | |
54 | ||
55 | avctx->time_base.num = 1; | |
56 | avctx->time_base.den = 90000; | |
57 | ||
58 | if (buf && buf_size) { | |
59 | switch(buf[0]) { | |
60 | case 0x00: | |
61 | if (buf_size == PCI_SIZE) { | |
62 | /* PCI */ | |
63 | uint32_t lba = AV_RB32(&buf[0x01]); | |
64 | uint32_t startpts = AV_RB32(&buf[0x0D]); | |
65 | uint32_t endpts = AV_RB32(&buf[0x11]); | |
66 | ||
67 | if (endpts > startpts) { | |
68 | pc1->lba = lba; | |
69 | s->pts = (int64_t)startpts; | |
70 | s->duration = endpts - startpts; | |
71 | ||
72 | memcpy(pc1->buffer, buf, PCI_SIZE); | |
73 | pc1->copied = PCI_SIZE; | |
74 | valid = 1; | |
75 | } | |
76 | } | |
77 | break; | |
78 | ||
79 | case 0x01: | |
80 | if ((buf_size == DSI_SIZE) && (pc1->copied == PCI_SIZE)) { | |
81 | /* DSI */ | |
82 | uint32_t lba = AV_RB32(&buf[0x05]); | |
83 | ||
84 | if (lba == pc1->lba) { | |
85 | memcpy(pc1->buffer + pc1->copied, buf, DSI_SIZE); | |
86 | lastPacket = 1; | |
87 | valid = 1; | |
88 | } | |
89 | } | |
90 | break; | |
91 | } | |
92 | } | |
93 | ||
94 | if (!valid || lastPacket) { | |
95 | pc1->copied = 0; | |
96 | pc1->lba = 0xFFFFFFFF; | |
97 | } | |
98 | ||
99 | if (lastPacket) { | |
100 | *poutbuf = pc1->buffer; | |
101 | *poutbuf_size = sizeof(pc1->buffer); | |
102 | } else { | |
103 | *poutbuf = NULL; | |
104 | *poutbuf_size = 0; | |
105 | } | |
106 | ||
107 | return buf_size; | |
108 | } | |
109 | ||
110 | AVCodecParser ff_dvd_nav_parser = { | |
111 | .codec_ids = { AV_CODEC_ID_DVD_NAV }, | |
112 | .priv_data_size = sizeof(DVDNavParseContext), | |
113 | .parser_init = dvd_nav_parse_init, | |
114 | .parser_parse = dvd_nav_parse, | |
115 | }; |