| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "demux.h" | ||
| 26 | #include "riff.h" | ||
| 27 | |||
| 28 | 7186 | static int read_probe(const AVProbeData *p) | |
| 29 | { | ||
| 30 |
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7186 | if (AV_RB32(p->buf ) != 0x000E || |
| 31 | ✗ | AV_RB32(p->buf + 4) != 0x0050 || | |
| 32 | ✗ | AV_RB32(p->buf + 12) != 0x0034) | |
| 33 | 7186 | return 0; | |
| 34 | ✗ | return AVPROBE_SCORE_MAX; | |
| 35 | } | ||
| 36 | |||
| 37 | ✗ | static int read_header(AVFormatContext *s) | |
| 38 | { | ||
| 39 | ✗ | AVIOContext *pb = s->pb; | |
| 40 | AVStream *st; | ||
| 41 | AVRational fps; | ||
| 42 | uint32_t chunk_size; | ||
| 43 | |||
| 44 | ✗ | avio_skip(pb, 4); | |
| 45 | ✗ | chunk_size = avio_rb32(pb); | |
| 46 | ✗ | if (chunk_size != 80) | |
| 47 | ✗ | return AVERROR(EIO); | |
| 48 | ✗ | avio_skip(pb, 20); | |
| 49 | |||
| 50 | ✗ | st = avformat_new_stream(s, 0); | |
| 51 | ✗ | if (!st) | |
| 52 | ✗ | return AVERROR(ENOMEM); | |
| 53 | |||
| 54 | ✗ | ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS; | |
| 55 | ✗ | st->start_time = 0; | |
| 56 | ✗ | st->nb_frames = | |
| 57 | ✗ | st->duration = avio_rb32(pb); | |
| 58 | ✗ | fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX); | |
| 59 | ✗ | st->codecpar->width = avio_rb32(pb); | |
| 60 | ✗ | st->codecpar->height = avio_rb32(pb); | |
| 61 | ✗ | avio_skip(pb, 12); | |
| 62 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 63 | ✗ | st->codecpar->codec_tag = avio_rb32(pb); | |
| 64 | ✗ | st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, | |
| 65 | ✗ | st->codecpar->codec_tag); | |
| 66 | ✗ | avpriv_set_pts_info(st, 64, fps.den, fps.num); | |
| 67 | ✗ | avio_skip(pb, 20); | |
| 68 | |||
| 69 | ✗ | return 0; | |
| 70 | } | ||
| 71 | |||
| 72 | ✗ | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 73 | { | ||
| 74 | ✗ | AVIOContext *pb = s->pb; | |
| 75 | uint32_t chunk_size, payload_size; | ||
| 76 | int ret; | ||
| 77 | |||
| 78 | ✗ | if (avio_feof(pb)) | |
| 79 | ✗ | return AVERROR_EOF; | |
| 80 | |||
| 81 | ✗ | avio_skip(pb, 4); | |
| 82 | ✗ | chunk_size = avio_rb32(pb); | |
| 83 | ✗ | avio_skip(pb, 4); | |
| 84 | ✗ | payload_size = avio_rb32(pb); | |
| 85 | |||
| 86 | ✗ | if (chunk_size < payload_size + 16) | |
| 87 | ✗ | return AVERROR(EIO); | |
| 88 | |||
| 89 | ✗ | ret = av_get_packet(pb, pkt, payload_size); | |
| 90 | ✗ | if (ret < 0) | |
| 91 | ✗ | return ret; | |
| 92 | |||
| 93 | ✗ | pkt->pos -= 16; | |
| 94 | ✗ | pkt->duration = 1; | |
| 95 | ✗ | avio_skip(pb, chunk_size - (ret + 16)); | |
| 96 | |||
| 97 | ✗ | return ret; | |
| 98 | } | ||
| 99 | |||
| 100 | const FFInputFormat ff_mgsts_demuxer = { | ||
| 101 | .p.name = "mgsts", | ||
| 102 | .p.long_name = NULL_IF_CONFIG_SMALL("Metal Gear Solid: The Twin Snakes"), | ||
| 103 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 104 | .read_probe = read_probe, | ||
| 105 | .read_header = read_header, | ||
| 106 | .read_packet = read_packet, | ||
| 107 | }; | ||
| 108 |