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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * Metar Gear Solid: The Twin Snakes demuxer |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/intreadwrite.h" |
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| 23 | #include "libavutil/intfloat.h" |
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| 24 | #include "avformat.h" |
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| 25 | #include "riff.h" |
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| 26 | |||
| 27 | static int read_probe(AVProbeData *p) |
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| 28 | { |
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| 29 | if (AV_RB32(p->buf ) != 0x000E || |
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| 30 | AV_RB32(p->buf + 4) != 0x0050 || |
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| 31 | AV_RB32(p->buf + 12) != 0x0034) |
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| 32 | return 0; |
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| 33 | return AVPROBE_SCORE_MAX; |
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| 34 | } |
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| 35 | |||
| 36 | static int read_header(AVFormatContext *s) |
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| 37 | { |
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| 38 | AVIOContext *pb = s->pb; |
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| 39 | AVStream *st; |
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| 40 | AVRational fps; |
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| 41 | uint32_t chunk_size; |
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| 42 | |||
| 43 | avio_skip(pb, 4); |
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| 44 | chunk_size = avio_rb32(pb); |
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| 45 | if (chunk_size != 80) |
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| 46 | return AVERROR(EIO); |
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| 47 | avio_skip(pb, 20); |
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| 48 | |||
| 49 | st = avformat_new_stream(s, 0); |
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| 50 | if (!st) |
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| 51 | return AVERROR(ENOMEM); |
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| 52 | |||
| 53 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
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| 54 | st->start_time = 0; |
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| 55 | st->nb_frames = |
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| 56 | st->duration = avio_rb32(pb); |
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| 57 | fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX); |
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| 58 | st->codec->width = avio_rb32(pb); |
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| 59 | st->codec->height = avio_rb32(pb); |
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| 60 | avio_skip(pb, 12); |
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| 61 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 62 | st->codec->codec_tag = avio_rb32(pb); |
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| 63 | st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, |
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| 64 | st->codec->codec_tag); |
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| 65 | avpriv_set_pts_info(st, 64, fps.den, fps.num); |
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| 66 | avio_skip(pb, 20); |
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| 67 | |||
| 68 | return 0; |
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| 69 | } |
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| 70 | |||
| 71 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 72 | { |
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| 73 | AVIOContext *pb = s->pb; |
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| 74 | uint32_t chunk_size, payload_size; |
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| 75 | int ret; |
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| 76 | |||
| 77 | if (url_feof(pb)) |
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| 78 | return AVERROR_EOF; |
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| 79 | |||
| 80 | avio_skip(pb, 4); |
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| 81 | chunk_size = avio_rb32(pb); |
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| 82 | avio_skip(pb, 4); |
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| 83 | payload_size = avio_rb32(pb); |
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| 84 | |||
| 85 | if (chunk_size < payload_size + 16) |
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| 86 | return AVERROR(EIO); |
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| 87 | |||
| 88 | ret = av_get_packet(pb, pkt, payload_size); |
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| 89 | if (ret < 0) |
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| 90 | return ret; |
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| 91 | |||
| 92 | pkt->pos -= 16; |
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| 93 | pkt->duration = 1; |
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| 94 | avio_skip(pb, chunk_size - (ret + 16)); |
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| 95 | |||
| 96 | return ret; |
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| 97 | } |
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| 98 | |||
| 99 | AVInputFormat ff_mgsts_demuxer = { |
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| 100 | .name = "mgsts", |
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| 101 | .long_name = NULL_IF_CONFIG_SMALL("Metal Gear Solid: The Twin Snakes"), |
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| 102 | .read_probe = read_probe, |
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| 103 | .read_header = read_header, |
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| 104 | .read_packet = read_packet, |
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| 105 | .flags = AVFMT_GENERIC_INDEX, |
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| 106 | }; |