1 /*
2 * FWSE demuxer
3 * Copyright (c) 2020 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 #include "pcm.h"
27
fwse_probe(const AVProbeData *p)28 static int fwse_probe(const AVProbeData *p)
29 {
30 if (AV_RL32(p->buf) != MKTAG('F','W','S','E'))
31 return 0;
32 if (AV_RL32(p->buf+4) != 2 && AV_RL32(p->buf+4) != 3)
33 return 0;
34 if (AV_RL32(p->buf+16) != 1 && AV_RL32(p->buf+16) != 2)
35 return 0;
36
37 return AVPROBE_SCORE_MAX / 4 * 3;
38 }
39
fwse_read_header(AVFormatContext *s)40 static int fwse_read_header(AVFormatContext *s)
41 {
42 unsigned start_offset, version;
43 int channels;
44 AVIOContext *pb = s->pb;
45 AVCodecParameters *par;
46 AVStream *st;
47
48 avio_skip(pb, 4);
49 version = avio_rl32(pb);
50 if (version != 2 && version != 3)
51 return AVERROR_INVALIDDATA;
52 avio_skip(pb, 4);
53 start_offset = avio_rl32(pb);
54
55 st = avformat_new_stream(s, NULL);
56 if (!st)
57 return AVERROR(ENOMEM);
58
59 par = st->codecpar;
60 par->codec_type = AVMEDIA_TYPE_AUDIO;
61 par->codec_id = AV_CODEC_ID_ADPCM_IMA_MTF;
62 par->format = AV_SAMPLE_FMT_S16;
63 channels = avio_rl32(pb);
64 if (channels != 1 && channels != 2)
65 return AVERROR_INVALIDDATA;
66 av_channel_layout_default(&par->ch_layout, channels);
67 st->duration = avio_rl32(pb);
68 par->sample_rate = avio_rl32(pb);
69 if (par->sample_rate <= 0 || par->sample_rate > INT_MAX)
70 return AVERROR_INVALIDDATA;
71
72 par->block_align = 1;
73 avio_skip(pb, start_offset - avio_tell(pb));
74
75 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
76
77 return 0;
78 }
79
80 const AVInputFormat ff_fwse_demuxer = {
81 .name = "fwse",
82 .long_name = NULL_IF_CONFIG_SMALL("Capcom's MT Framework sound"),
83 .read_probe = fwse_probe,
84 .read_header = fwse_read_header,
85 .read_packet = ff_pcm_read_packet,
86 .extensions = "fwse",
87 };
88