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1 | /* |
2 | * AVR demuxer | |
3 | * Copyright (c) 2012 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 | ||
27 | static int avr_probe(AVProbeData *p) | |
28 | { | |
29 | if (AV_RL32(p->buf) != MKTAG('2', 'B', 'I', 'T')) | |
30 | return 0; | |
31 | ||
32 | if (!AV_RB16(p->buf+12) || AV_RB16(p->buf+12) > 256) // channels | |
33 | return AVPROBE_SCORE_EXTENSION/2; | |
34 | if (AV_RB16(p->buf+14) > 256) // bps | |
35 | return AVPROBE_SCORE_EXTENSION/2; | |
36 | ||
37 | return AVPROBE_SCORE_EXTENSION; | |
38 | } | |
39 | ||
40 | static int avr_read_header(AVFormatContext *s) | |
41 | { | |
42 | uint16_t chan, sign, bps; | |
43 | AVStream *st; | |
44 | ||
45 | st = avformat_new_stream(s, NULL); | |
46 | if (!st) | |
47 | return AVERROR(ENOMEM); | |
48 | ||
49 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
50 | ||
51 | avio_skip(s->pb, 4); // magic | |
52 | avio_skip(s->pb, 8); // sample_name | |
53 | ||
54 | chan = avio_rb16(s->pb); | |
55 | if (!chan) { | |
56 | st->codec->channels = 1; | |
57 | } else if (chan == 0xFFFFu) { | |
58 | st->codec->channels = 2; | |
59 | } else { | |
60 | avpriv_request_sample(s, "chan %d", chan); | |
61 | return AVERROR_PATCHWELCOME; | |
62 | } | |
63 | ||
64 | st->codec->bits_per_coded_sample = bps = avio_rb16(s->pb); | |
65 | ||
66 | sign = avio_rb16(s->pb); | |
67 | ||
68 | avio_skip(s->pb, 2); // loop | |
69 | avio_skip(s->pb, 2); // midi | |
70 | avio_skip(s->pb, 1); // replay speed | |
71 | ||
72 | st->codec->sample_rate = avio_rb24(s->pb); | |
73 | avio_skip(s->pb, 4 * 3); | |
74 | avio_skip(s->pb, 2 * 3); | |
75 | avio_skip(s->pb, 20); | |
76 | avio_skip(s->pb, 64); | |
77 | ||
78 | st->codec->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign); | |
79 | if (st->codec->codec_id == AV_CODEC_ID_NONE) { | |
80 | avpriv_request_sample(s, "Bps %d and sign %d", bps, sign); | |
81 | return AVERROR_PATCHWELCOME; | |
82 | } | |
83 | ||
84 | st->codec->block_align = bps * st->codec->channels / 8; | |
85 | ||
86 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
87 | return 0; | |
88 | } | |
89 | ||
90 | AVInputFormat ff_avr_demuxer = { | |
91 | .name = "avr", | |
92 | .long_name = NULL_IF_CONFIG_SMALL("AVR (Audio Visual Research)"), | |
93 | .read_probe = avr_probe, | |
94 | .read_header = avr_read_header, | |
95 | .read_packet = ff_pcm_read_packet, | |
96 | .read_seek = ff_pcm_read_seek, | |
97 | .extensions = "avr", | |
98 | .flags = AVFMT_GENERIC_INDEX, | |
99 | }; |