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2ba45a60 DM |
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->codec->width = avio_rb32(pb); | |
59 | st->codec->height = avio_rb32(pb); | |
60 | avio_skip(pb, 12); | |
61 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
62 | st->codec->codec_tag = avio_rb32(pb); | |
63 | st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, | |
64 | st->codec->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 | }; |