FFmpeg
binka.c
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1 /*
2  * Copyright (c) 2021 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/intreadwrite.h"
22 #include "avformat.h"
23 #include "internal.h"
24 
25 static int binka_probe(const AVProbeData *p)
26 {
27  if (AV_RB32(p->buf) == MKBETAG('1', 'F', 'C', 'B') &&
28  (p->buf[4] == 1 || p->buf[4] == 2))
29  return AVPROBE_SCORE_MAX;
30  return 0;
31 }
32 
34 {
35  AVIOContext *pb = s->pb;
36  AVStream *st;
37  int entries, offset;
38 
39  st = avformat_new_stream(s, NULL);
40  if (!st)
41  return AVERROR(ENOMEM);
42 
43  avio_skip(pb, 5);
44 
47  st->codecpar->channels = avio_r8(pb);
48  st->codecpar->sample_rate = avio_rl16(pb);
49  st->duration = avio_rl32(pb);
50 
51  avio_skip(pb, 8);
52  entries = avio_rl16(pb);
53 
54  offset = entries * 2 + 2;
55  avio_skip(pb, offset);
56 
57  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
58 
59  return 0;
60 }
61 
63 {
64  AVIOContext *pb = s->pb;
65  AVStream *st = s->streams[0];
66  int64_t pos;
67  int pkt_size;
68  int ret;
69 
70  if (avio_feof(pb))
71  return AVERROR_EOF;
72 
73  pos = avio_tell(pb);
74  avio_skip(pb, 2);
75  pkt_size = avio_rl16(pb) + 4;
76  if (pkt_size <= 4)
77  return AVERROR(EIO);
78  ret = av_new_packet(pkt, pkt_size);
79  if (ret < 0)
80  return ret;
81 
82  avio_read(pb, pkt->data + 4, pkt_size - 4);
83  AV_WL32(pkt->data, pkt_size);
84 
85  pkt->pos = pos;
86  pkt->stream_index = 0;
88 
89  return 0;
90 }
91 
93  .name = "binka",
94  .long_name = NULL_IF_CONFIG_SMALL("Bink Audio"),
95  .read_probe = binka_probe,
96  .read_header = binka_read_header,
97  .read_packet = binka_read_packet,
98  .flags = AVFMT_GENERIC_INDEX,
99  .extensions = "binka",
100 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4999
static int binka_read_header(AVFormatContext *s)
Definition: binka.c:33
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
AVPacket * pkt
Definition: movenc.c:59
Format I/O context.
Definition: avformat.h:1247
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4553
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:91
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1315
uint8_t * data
Definition: packet.h:369
#define AVERROR_EOF
End of file.
Definition: error.h:55
static int binka_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: binka.c:62
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:117
unsigned int pos
Definition: spdifenc.c:412
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVInputFormat ff_binka_demuxer
Definition: binka.c:92
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:835
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
#define s(width, name)
Definition: cbs_vp9.c:257
Stream structure.
Definition: avformat.h:884
AVIOContext * pb
I/O context.
Definition: avformat.h:1289
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
static int binka_probe(const AVProbeData *p)
Definition: binka.c:25
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:933
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
Main libavformat public API header.
#define MKBETAG(a, b, c, d)
Definition: common.h:479
int channels
Audio only.
Definition: codec_par.h:166
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1049
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
int stream_index
Definition: packet.h:371
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
This structure stores compressed data.
Definition: packet.h:346
#define AV_WL32(p, v)
Definition: intreadwrite.h:426