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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 "libavcodec/internal.h"
24 #include "avformat.h"
25 #include "internal.h"
26 
27 static int probe(AVProbeData *p)
28 {
29  if (p->buf_size < 2096)
30  return 0;
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)
38  )
39  return 0;
41 }
42 
43 
45 {
47  if (!st)
48  return AVERROR(ENOMEM);
49 
52 
53  avio_rl32(s->pb);
54  avio_rl32(s->pb);
55  st->codecpar->sample_rate = avio_rl32(s->pb);
56  st->codecpar->channels = avio_rl32(s->pb);
58  return AVERROR(ENOSYS);
59  s->internal->data_offset = avio_rl32(s->pb);
60  avio_r8(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;
65 
66  avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
67 
68  return 0;
69 }
70 
72 {
73  AVStream *st = s->streams[0];
74 
75  return av_get_packet(s->pb, pkt, st->codecpar->block_align);
76 }
77 
79  .name = "boa",
80  .long_name = NULL_IF_CONFIG_SMALL("Black Ops Audio"),
81  .read_probe = probe,
82  .read_header = read_header,
83  .read_packet = read_packet,
84  .flags = AVFMT_GENERIC_INDEX,
85 };
#define FF_SANE_NB_CHANNELS
Definition: internal.h:86
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int64_t data_offset
offset of the first packet
Definition: internal.h:82
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3900
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1804
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
Format I/O context.
Definition: avformat.h:1351
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: boadec.c:71
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4455
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3896
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:639
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:451
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int block_align
Audio only.
Definition: avcodec.h:4017
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat ff_boa_demuxer
Definition: boadec.c:78
Stream structure.
Definition: avformat.h:874
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:470
static int read_header(AVFormatContext *s)
Definition: boadec.c:44
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:458
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
int sample_rate
Audio only.
Definition: avcodec.h:4010
Main libavformat public API header.
common internal api header.
int channels
Audio only.
Definition: avcodec.h:4006
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1422
static int probe(AVProbeData *p)
Definition: boadec.c:27