FFmpeg  4.4.5
derf.c
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1 /*
2  * DERF demuxer
3  * Copyright (c) 2020 Paul B Mahol
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 #include "pcm.h"
26 
27 static int derf_probe(const AVProbeData *p)
28 {
29  if (AV_RL32(p->buf) != MKTAG('D','E','R','F'))
30  return 0;
31  if (AV_RL32(p->buf+4) != 1 && AV_RL32(p->buf+4) != 2)
32  return 0;
33 
34  return AVPROBE_SCORE_MAX / 3 * 2;
35 }
36 
38 {
39  unsigned data_size;
40  AVIOContext *pb = s->pb;
41  AVCodecParameters *par;
42  AVStream *st;
43 
44  avio_skip(pb, 4);
45 
46  st = avformat_new_stream(s, NULL);
47  if (!st)
48  return AVERROR(ENOMEM);
49 
50  par = st->codecpar;
54  par->channels = avio_rl32(pb);
55  if (par->channels != 1 && par->channels != 2)
56  return AVERROR_INVALIDDATA;
57  if (par->channels == 1)
59  else if (par->channels == 2)
61  data_size = avio_rl32(pb);
62  st->duration = data_size / par->channels;
63  par->sample_rate = 22050;
64  par->block_align = 1;
65 
66  avpriv_set_pts_info(st, 64, 1, par->sample_rate);
67 
68  return 0;
69 }
70 
72  .name = "derf",
73  .long_name = NULL_IF_CONFIG_SMALL("Xilam DERF"),
74  .read_probe = derf_probe,
75  .read_header = derf_read_header,
76  .read_packet = ff_pcm_read_packet,
77  .read_seek = ff_pcm_read_seek,
78  .extensions = "adp",
79 };
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
#define AV_RL32
Definition: intreadwrite.h:146
#define s(width, name)
Definition: cbs_vp9.c:257
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define NULL
Definition: coverity.c:32
static int derf_probe(const AVProbeData *p)
Definition: derf.c:27
AVInputFormat ff_derf_demuxer
Definition: derf.c:71
static int derf_read_header(AVFormatContext *s)
Definition: derf.c:37
#define AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_STEREO
@ AV_CODEC_ID_DERF_DPCM
Definition: codec_id.h:421
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:61
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
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:56
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
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int block_align
Audio only.
Definition: codec_par.h:177
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 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