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2ba45a60 DM |
1 | /* |
2 | * Black ops audio demuxer | |
3 | * Copyright (c) 2013 Michael Niedermayer | |
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 | ||
25 | static int probe(AVProbeData *p) | |
26 | { | |
27 | if (p->buf_size < 2096) | |
28 | return 0; | |
29 | if ( AV_RL32(p->buf ) != 1 | |
30 | || AV_RL32(p->buf + 8) > 100000 | |
31 | || AV_RL32(p->buf + 12) > 8 | |
32 | || AV_RL32(p->buf + 16) != 2096 | |
33 | ||!AV_RL32(p->buf + 21) | |
34 | || AV_RL16(p->buf + 25) != 2096 | |
35 | || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21) | |
36 | ) | |
37 | return 0; | |
38 | return AVPROBE_SCORE_EXTENSION; | |
39 | } | |
40 | ||
41 | ||
42 | static int read_header(AVFormatContext *s) | |
43 | { | |
44 | AVStream *st = avformat_new_stream(s, NULL); | |
45 | if (!st) | |
46 | return AVERROR(ENOMEM); | |
47 | ||
48 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
49 | st->codec->codec_id = AV_CODEC_ID_ADPCM_MS; | |
50 | ||
51 | avio_rl32(s->pb); | |
52 | avio_rl32(s->pb); | |
53 | st->codec->sample_rate = avio_rl32(s->pb); | |
54 | st->codec->channels = avio_rl32(s->pb); | |
55 | s->data_offset = avio_rl32(s->pb); | |
56 | avio_r8(s->pb); | |
57 | st->codec->block_align = st->codec->channels * avio_rl32(s->pb); | |
58 | ||
59 | avio_seek(s->pb, s->data_offset, SEEK_SET); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
65 | { | |
66 | AVStream *st = s->streams[0]; | |
67 | ||
68 | return av_get_packet(s->pb, pkt, st->codec->block_align); | |
69 | } | |
70 | ||
71 | AVInputFormat ff_boa_demuxer = { | |
72 | .name = "boa", | |
73 | .long_name = NULL_IF_CONFIG_SMALL("Black Ops Audio"), | |
74 | .read_probe = probe, | |
75 | .read_header = read_header, | |
76 | .read_packet = read_packet, | |
77 | .flags = AVFMT_GENERIC_INDEX, | |
78 | }; |