2 * Black ops audio demuxer
3 * Copyright (c) 2013 Michael Niedermayer
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
25 static int probe(AVProbeData
*p
)
27 if (p
->buf_size
< 2096)
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)
38 return AVPROBE_SCORE_EXTENSION
;
42 static int read_header(AVFormatContext
*s
)
44 AVStream
*st
= avformat_new_stream(s
, NULL
);
46 return AVERROR(ENOMEM
);
48 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
49 st
->codec
->codec_id
= AV_CODEC_ID_ADPCM_MS
;
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
);
57 st
->codec
->block_align
= st
->codec
->channels
* avio_rl32(s
->pb
);
59 avio_seek(s
->pb
, s
->data_offset
, SEEK_SET
);
64 static int read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
66 AVStream
*st
= s
->streams
[0];
68 return av_get_packet(s
->pb
, pkt
, st
->codec
->block_align
);
71 AVInputFormat ff_boa_demuxer
= {
73 .long_name
= NULL_IF_CONFIG_SMALL("Black Ops Audio"),
75 .read_header
= read_header
,
76 .read_packet
= read_packet
,
77 .flags
= AVFMT_GENERIC_INDEX
,