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1 | /* | ||
2 | * DERF 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 "demux.h" | ||
26 | #include "internal.h" | ||
27 | #include "pcm.h" | ||
28 | |||
29 | 7162 | static int derf_probe(const AVProbeData *p) | |
30 | { | ||
31 |
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7162 | if (AV_RL32(p->buf) != MKTAG('D','E','R','F')) |
32 | 7162 | return 0; | |
33 | ✗ | if (AV_RL32(p->buf+4) != 1 && AV_RL32(p->buf+4) != 2) | |
34 | ✗ | return 0; | |
35 | |||
36 | ✗ | return AVPROBE_SCORE_MAX / 3 * 2; | |
37 | } | ||
38 | |||
39 | ✗ | static int derf_read_header(AVFormatContext *s) | |
40 | { | ||
41 | unsigned data_size; | ||
42 | int channels; | ||
43 | ✗ | AVIOContext *pb = s->pb; | |
44 | AVCodecParameters *par; | ||
45 | AVStream *st; | ||
46 | |||
47 | ✗ | avio_skip(pb, 4); | |
48 | |||
49 | ✗ | st = avformat_new_stream(s, NULL); | |
50 | ✗ | if (!st) | |
51 | ✗ | return AVERROR(ENOMEM); | |
52 | |||
53 | ✗ | par = st->codecpar; | |
54 | ✗ | par->codec_type = AVMEDIA_TYPE_AUDIO; | |
55 | ✗ | par->codec_id = AV_CODEC_ID_DERF_DPCM; | |
56 | ✗ | par->format = AV_SAMPLE_FMT_S16; | |
57 | ✗ | channels = avio_rl32(pb); | |
58 | ✗ | if (channels != 1 && channels != 2) | |
59 | ✗ | return AVERROR_INVALIDDATA; | |
60 | ✗ | av_channel_layout_default(&par->ch_layout, channels); | |
61 | ✗ | data_size = avio_rl32(pb); | |
62 | ✗ | st->duration = data_size / channels; | |
63 | ✗ | par->sample_rate = 22050; | |
64 | ✗ | par->block_align = 1; | |
65 | |||
66 | ✗ | avpriv_set_pts_info(st, 64, 1, par->sample_rate); | |
67 | |||
68 | ✗ | return 0; | |
69 | } | ||
70 | |||
71 | const FFInputFormat ff_derf_demuxer = { | ||
72 | .p.name = "derf", | ||
73 | .p.long_name = NULL_IF_CONFIG_SMALL("Xilam DERF"), | ||
74 | .p.extensions = "adp", | ||
75 | .read_probe = derf_probe, | ||
76 | .read_header = derf_read_header, | ||
77 | .read_packet = ff_pcm_read_packet, | ||
78 | .read_seek = ff_pcm_read_seek, | ||
79 | }; | ||
80 |