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/intreadwrite.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "pcm.h"
26
fwse_probe(const AVProbeData * p)27 static int fwse_probe(const AVProbeData *p)
28 {
29 if (AV_RL32(p->buf) != MKTAG('F','W','S','E'))
30 return 0;
31 if (AV_RL32(p->buf+4) != 2 && AV_RL32(p->buf+4) != 3)
32 return 0;
33 if (AV_RL32(p->buf+16) != 1 && AV_RL32(p->buf+16) != 2)
34 return 0;
35
36 return AVPROBE_SCORE_MAX / 4 * 3;
37 }
38
fwse_read_header(AVFormatContext * s)39 static int fwse_read_header(AVFormatContext *s)
40 {
41 unsigned start_offset, version;
42 AVIOContext *pb = s->pb;
43 AVCodecParameters *par;
44 AVStream *st;
45
46 avio_skip(pb, 4);
47 version = avio_rl32(pb);
48 if (version != 2 && version != 3)
49 return AVERROR_INVALIDDATA;
50 avio_skip(pb, 4);
51 start_offset = avio_rl32(pb);
52
53 st = avformat_new_stream(s, NULL);
54 if (!st)
55 return AVERROR(ENOMEM);
56
57 par = st->codecpar;
58 par->codec_type = AVMEDIA_TYPE_AUDIO;
59 par->codec_id = AV_CODEC_ID_ADPCM_IMA_MTF;
60 par->format = AV_SAMPLE_FMT_S16;
61 par->channels = avio_rl32(pb);
62 if (par->channels != 1 && par->channels != 2)
63 return AVERROR_INVALIDDATA;
64 if (par->channels == 1)
65 par->channel_layout = AV_CH_LAYOUT_MONO;
66 else if (par->channels == 2)
67 par->channel_layout = AV_CH_LAYOUT_STEREO;
68 st->duration = avio_rl32(pb);
69 par->sample_rate = avio_rl32(pb);
70 if (par->sample_rate <= 0 || par->sample_rate > INT_MAX)
71 return AVERROR_INVALIDDATA;
72
73 par->block_align = 1;
74 avio_skip(pb, start_offset - avio_tell(pb));
75
76 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
77
78 return 0;
79 }
80
81 AVInputFormat ff_fwse_demuxer = {
82 .name = "fwse",
83 .long_name = NULL_IF_CONFIG_SMALL("Capcom's MT Framework sound"),
84 .read_probe = fwse_probe,
85 .read_header = fwse_read_header,
86 .read_packet = ff_pcm_read_packet,
87 .extensions = "fwse",
88 };
89