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epafdec.c
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1 /*
2  * Ensoniq Paris Audio File demuxer
3  * Copyright (c) 2012 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 "libavcodec/internal.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "pcm.h"
27 
28 static int epaf_probe(AVProbeData *p)
29 {
30  if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&
31  AV_RL32(p->buf + 8) == 1) ||
32  (AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&
33  AV_RN32(p->buf + 8) == 0)) &&
34  !AV_RN32(p->buf + 4) && AV_RN32(p->buf + 12) &&
35  AV_RN32(p->buf + 20))
36  return AVPROBE_SCORE_MAX / 4 * 3;
37  return 0;
38 }
39 
41 {
42  int le, sample_rate, codec, channels;
43  AVStream *st;
44 
45  avio_skip(s->pb, 4);
46  if (avio_rl32(s->pb))
47  return AVERROR_INVALIDDATA;
48 
49  le = avio_rl32(s->pb);
50  if (le && le != 1)
51  return AVERROR_INVALIDDATA;
52 
53  if (le) {
54  sample_rate = avio_rl32(s->pb);
55  codec = avio_rl32(s->pb);
56  channels = avio_rl32(s->pb);
57  } else {
58  sample_rate = avio_rb32(s->pb);
59  codec = avio_rb32(s->pb);
60  channels = avio_rb32(s->pb);
61  }
62 
63  if (channels <= 0 || channels > FF_SANE_NB_CHANNELS || sample_rate <= 0)
64  return AVERROR_INVALIDDATA;
65 
66  st = avformat_new_stream(s, NULL);
67  if (!st)
68  return AVERROR(ENOMEM);
69 
71  st->codecpar->channels = channels;
73  switch (codec) {
74  case 0:
76  break;
77  case 2:
79  break;
80  case 1:
81  avpriv_request_sample(s, "24-bit Paris PCM format");
82  default:
83  return AVERROR_INVALIDDATA;
84  }
85 
88 
89  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
90 
91  if (avio_skip(s->pb, 2024) < 0)
92  return AVERROR_INVALIDDATA;
93  return 0;
94 }
95 
97  .name = "epaf",
98  .long_name = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),
99  .read_probe = epaf_probe,
100  .read_header = epaf_read_header,
101  .read_packet = ff_pcm_read_packet,
102  .read_seek = ff_pcm_read_seek,
103  .extensions = "paf,fap",
104  .flags = AVFMT_GENERIC_INDEX,
105 };
#define FF_SANE_NB_CHANNELS
Definition: internal.h:91
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
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:4747
channels
Definition: aptx.c:30
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3736
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
Format I/O context.
Definition: avformat.h:1325
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:799
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4377
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1636
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:768
#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:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3732
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int block_align
Audio only.
Definition: avcodec.h:3853
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
static int epaf_read_header(AVFormatContext *s)
Definition: epafdec.c:40
Stream structure.
Definition: avformat.h:872
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1367
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:470
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
#define AV_RN32(p)
Definition: intreadwrite.h:364
int sample_rate
Audio only.
Definition: avcodec.h:3846
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
common internal api header.
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3778
int channels
Audio only.
Definition: avcodec.h:3842
static int epaf_probe(AVProbeData *p)
Definition: epafdec.c:28
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1014
#define MKTAG(a, b, c, d)
Definition: common.h:342
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVInputFormat ff_epaf_demuxer
Definition: epafdec.c:96