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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 #include "internal.h"
25 
26 static int probe(AVProbeData *p)
27 {
28  if (p->buf_size < 2096)
29  return 0;
30  if ( AV_RL32(p->buf ) != 1
31  || AV_RL32(p->buf + 8) > 100000
32  || AV_RL32(p->buf + 12) > 8
33  || AV_RL32(p->buf + 16) != 2096
34  ||!AV_RL32(p->buf + 21)
35  || AV_RL16(p->buf + 25) != 2096
36  || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21)
37  )
38  return 0;
40 }
41 
42 
44 {
46  if (!st)
47  return AVERROR(ENOMEM);
48 
51 
52  avio_rl32(s->pb);
53  avio_rl32(s->pb);
54  st->codec->sample_rate = avio_rl32(s->pb);
55  st->codec->channels = avio_rl32(s->pb);
56  s->internal->data_offset = avio_rl32(s->pb);
57  avio_r8(s->pb);
58  st->codec->block_align = st->codec->channels * avio_rl32(s->pb);
59 
60  avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
61 
62  return 0;
63 }
64 
66 {
67  AVStream *st = s->streams[0];
68 
69  return av_get_packet(s->pb, pkt, st->codec->block_align);
70 }
71 
73  .name = "boa",
74  .long_name = NULL_IF_CONFIG_SMALL("Black Ops Audio"),
75  .read_probe = probe,
76  .read_header = read_header,
77  .read_packet = read_packet,
78  .flags = AVFMT_GENERIC_INDEX,
79 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
int64_t data_offset
offset of the first packet
Definition: internal.h:66
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:203
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1695
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:85
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2022
Format I/O context.
Definition: avformat.h:1272
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: boadec.c:65
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3672
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1340
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:241
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:658
#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:175
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:528
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
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
AVInputFormat ff_boa_demuxer
Definition: boadec.c:72
Stream structure.
Definition: avformat.h:842
enum AVMediaType codec_type
Definition: avcodec.h:1249
enum AVCodecID codec_id
Definition: avcodec.h:1258
int sample_rate
samples per second
Definition: avcodec.h:1985
AVIOContext * pb
I/O context.
Definition: avformat.h:1314
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:473
static int read_header(AVFormatContext *s)
Definition: boadec.c:43
#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
Main libavformat public API header.
int channels
number of audio channels
Definition: avcodec.h:1986
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:85
This structure stores compressed data.
Definition: avcodec.h:1139
static int probe(AVProbeData *p)
Definition: boadec.c:26