blob: b25c2aa40219f892a07dfefd793f5be1bf8fe617
1 | /* |
2 | * MTAF demuxer |
3 | * Copyright (c) 2016 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/channel_layout.h" |
23 | #include "libavutil/intreadwrite.h" |
24 | #include "avformat.h" |
25 | #include "internal.h" |
26 | |
27 | static int mtaf_probe(AVProbeData *p) |
28 | { |
29 | if (p->buf_size < 0x44) |
30 | return 0; |
31 | |
32 | if (AV_RL32(p->buf) != MKTAG('M','T','A','F') || |
33 | AV_RL32(p->buf + 0x40) != MKTAG('H','E','A','D')) |
34 | return 0; |
35 | |
36 | return AVPROBE_SCORE_MAX; |
37 | } |
38 | |
39 | static int mtaf_read_header(AVFormatContext *s) |
40 | { |
41 | int stream_count; |
42 | AVStream *st; |
43 | |
44 | st = avformat_new_stream(s, NULL); |
45 | if (!st) |
46 | return AVERROR(ENOMEM); |
47 | |
48 | avio_skip(s->pb, 0x5c); |
49 | st->duration = avio_rl32(s->pb); |
50 | avio_skip(s->pb, 1); |
51 | stream_count = avio_r8(s->pb); |
52 | if (!stream_count) |
53 | return AVERROR_INVALIDDATA; |
54 | |
55 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
56 | st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MTAF; |
57 | st->codecpar->channels = 2 * stream_count; |
58 | st->codecpar->sample_rate = 48000; |
59 | st->codecpar->block_align = 0x110 * st->codecpar->channels / 2; |
60 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
61 | |
62 | avio_seek(s->pb, 0x800, SEEK_SET); |
63 | |
64 | return 0; |
65 | } |
66 | |
67 | static int mtaf_read_packet(AVFormatContext *s, AVPacket *pkt) |
68 | { |
69 | AVCodecParameters *par = s->streams[0]->codecpar; |
70 | |
71 | return av_get_packet(s->pb, pkt, par->block_align); |
72 | } |
73 | |
74 | AVInputFormat ff_mtaf_demuxer = { |
75 | .name = "mtaf", |
76 | .long_name = NULL_IF_CONFIG_SMALL("Konami PS2 MTAF"), |
77 | .read_probe = mtaf_probe, |
78 | .read_header = mtaf_read_header, |
79 | .read_packet = mtaf_read_packet, |
80 | .extensions = "mtaf", |
81 | }; |
82 |