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"
23 #include "libavcodec/internal.h"
27 static int probe(AVProbeData *p)
29 if (p->buf_size < 2096)
31 if ( AV_RL32(p->buf ) != 1
32 || AV_RL32(p->buf + 8) > 100000
33 || AV_RL32(p->buf + 12) > 8
34 || AV_RL32(p->buf + 16) != 2096
35 ||!AV_RL32(p->buf + 21)
36 || AV_RL16(p->buf + 25) != 2096
37 || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21)
40 return AVPROBE_SCORE_EXTENSION;
44 static int read_header(AVFormatContext *s)
46 AVStream *st = avformat_new_stream(s, NULL);
48 return AVERROR(ENOMEM);
50 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
51 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MS;
55 st->codecpar->sample_rate = avio_rl32(s->pb);
56 st->codecpar->channels = avio_rl32(s->pb);
57 if (st->codecpar->channels > FF_SANE_NB_CHANNELS)
58 return AVERROR(ENOSYS);
59 s->internal->data_offset = avio_rl32(s->pb);
61 st->codecpar->block_align = avio_rl32(s->pb);
62 if (st->codecpar->block_align > INT_MAX / FF_SANE_NB_CHANNELS)
63 return AVERROR_INVALIDDATA;
64 st->codecpar->block_align *= st->codecpar->channels;
66 avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
71 static int read_packet(AVFormatContext *s, AVPacket *pkt)
73 AVStream *st = s->streams[0];
75 return av_get_packet(s->pb, pkt, st->codecpar->block_align);
78 AVInputFormat ff_boa_demuxer = {
80 .long_name = NULL_IF_CONFIG_SMALL("Black Ops Audio"),
82 .read_header = read_header,
83 .read_packet = read_packet,
84 .flags = AVFMT_GENERIC_INDEX,