FFmpeg  4.4.4
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 };
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
#define AV_RB32
Definition: intreadwrite.h:130
static int binka_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: binka.c:62
static int binka_probe(const AVProbeData *p)
Definition: binka.c:25
static int binka_read_header(AVFormatContext *s)
Definition: binka.c:33
AVInputFormat ff_binka_demuxer
Definition: binka.c:92
#define s(width, name)
Definition: cbs_vp9.c:257
#define MKBETAG(a, b, c, d)
Definition: common.h:479
#define NULL
Definition: coverity.c:32
@ AV_CODEC_ID_BINKAUDIO_DCT
Definition: codec_id.h:472
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:871
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
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
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:4945
common internal API header
#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
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
uint8_t * data
Definition: packet.h:369
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
AVPacket * pkt
Definition: movenc.c:59
static const uint8_t offset[127][2]
Definition: vf_spp.c:107