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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
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  */
22 #include "libavutil/intreadwrite.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "pcm.h"
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;
34  return AVPROBE_SCORE_MAX / 3 * 2;
35 }
38 {
39  unsigned data_size;
40  AVIOContext *pb = s->pb;
41  AVCodecParameters *par;
42  AVStream *st;
44  avio_skip(pb, 4);
46  st = avformat_new_stream(s, NULL);
47  if (!st)
48  return AVERROR(ENOMEM);
50  par = st->codecpar;
54  par->channels = avio_rl32(pb);
55  if (par->channels != 1 && par->channels != 2)
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;
66  avpriv_set_pts_info(st, 64, 1, par->sample_rate);
68  return 0;
69 }
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 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
Invalid data found when processing input.
Definition: error.h:59
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
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
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1247
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4553
static int derf_read_header(AVFormatContext *s)
Definition: derf.c:37
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:117
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
int block_align
Audio only.
Definition: codec_par.h:177
static int derf_probe(const AVProbeData *p)
Definition: derf.c:27
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:56
Stream structure.
Definition: avformat.h:884
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
AVIOContext * pb
I/O context.
Definition: avformat.h:1289
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
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
maximum score
Definition: avformat.h:453
Main libavformat public API header.
signed 16 bits
Definition: samplefmt.h:61
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
AVInputFormat ff_derf_demuxer
Definition: derf.c:71
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
#define MKTAG(a, b, c, d)
Definition: common.h:478
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:91