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 */
29typedef struct DVDNavParseContext {
30    uint32_t     lba;
31    uint8_t      buffer[PCI_SIZE+DSI_SIZE];
32    int          copied;
33} DVDNavParseContext;
34
35static 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
44static 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
110const 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