blob: 0720de8d8687f1a0d797a612299df636b1d83661
1 | /* |
2 | * Metar Gear Solid: The Twin Snakes demuxer |
3 | * Copyright (c) 2012 Paul B Mahol |
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 "libavutil/intreadwrite.h" |
23 | #include "libavutil/intfloat.h" |
24 | #include "avformat.h" |
25 | #include "riff.h" |
26 | |
27 | static int read_probe(AVProbeData *p) |
28 | { |
29 | if (AV_RB32(p->buf ) != 0x000E || |
30 | AV_RB32(p->buf + 4) != 0x0050 || |
31 | AV_RB32(p->buf + 12) != 0x0034) |
32 | return 0; |
33 | return AVPROBE_SCORE_MAX; |
34 | } |
35 | |
36 | static int read_header(AVFormatContext *s) |
37 | { |
38 | AVIOContext *pb = s->pb; |
39 | AVStream *st; |
40 | AVRational fps; |
41 | uint32_t chunk_size; |
42 | |
43 | avio_skip(pb, 4); |
44 | chunk_size = avio_rb32(pb); |
45 | if (chunk_size != 80) |
46 | return AVERROR(EIO); |
47 | avio_skip(pb, 20); |
48 | |
49 | st = avformat_new_stream(s, 0); |
50 | if (!st) |
51 | return AVERROR(ENOMEM); |
52 | |
53 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
54 | st->start_time = 0; |
55 | st->nb_frames = |
56 | st->duration = avio_rb32(pb); |
57 | fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX); |
58 | st->codecpar->width = avio_rb32(pb); |
59 | st->codecpar->height = avio_rb32(pb); |
60 | avio_skip(pb, 12); |
61 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
62 | st->codecpar->codec_tag = avio_rb32(pb); |
63 | st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, |
64 | st->codecpar->codec_tag); |
65 | avpriv_set_pts_info(st, 64, fps.den, fps.num); |
66 | avio_skip(pb, 20); |
67 | |
68 | return 0; |
69 | } |
70 | |
71 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
72 | { |
73 | AVIOContext *pb = s->pb; |
74 | uint32_t chunk_size, payload_size; |
75 | int ret; |
76 | |
77 | if (avio_feof(pb)) |
78 | return AVERROR_EOF; |
79 | |
80 | avio_skip(pb, 4); |
81 | chunk_size = avio_rb32(pb); |
82 | avio_skip(pb, 4); |
83 | payload_size = avio_rb32(pb); |
84 | |
85 | if (chunk_size < payload_size + 16) |
86 | return AVERROR(EIO); |
87 | |
88 | ret = av_get_packet(pb, pkt, payload_size); |
89 | if (ret < 0) |
90 | return ret; |
91 | |
92 | pkt->pos -= 16; |
93 | pkt->duration = 1; |
94 | avio_skip(pb, chunk_size - (ret + 16)); |
95 | |
96 | return ret; |
97 | } |
98 | |
99 | AVInputFormat ff_mgsts_demuxer = { |
100 | .name = "mgsts", |
101 | .long_name = NULL_IF_CONFIG_SMALL("Metal Gear Solid: The Twin Snakes"), |
102 | .read_probe = read_probe, |
103 | .read_header = read_header, |
104 | .read_packet = read_packet, |
105 | .flags = AVFMT_GENERIC_INDEX, |
106 | }; |
107 |