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boadec.c
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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;
39 }
40 
41 
43 {
44  AVStream *st = avformat_new_stream(s, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
47 
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 
65 {
66  AVStream *st = s->streams[0];
67 
68  return av_get_packet(s->pb, pkt, st->codec->block_align);
69 }
70 
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 };