blob: 6e2352dc3c0d3adf368bd126c8274975f6885403
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 | }; |
116 |