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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 "avformat.h"
24 #include "internal.h"
25 #include "pcm.h"
26 
27 static int epaf_probe(AVProbeData *p)
28 {
29  if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&
30  AV_RL32(p->buf + 8) == 1) ||
31  (AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&
32  AV_RN32(p->buf + 8) == 0)) &&
33  !AV_RN32(p->buf + 4) && AV_RN32(p->buf + 12) &&
34  AV_RN32(p->buf + 20))
35  return AVPROBE_SCORE_MAX / 4 * 3;
36  return 0;
37 }
38 
40 {
41  int le, sample_rate, codec, channels;
42  AVStream *st;
43 
44  avio_skip(s->pb, 4);
45  if (avio_rl32(s->pb))
46  return AVERROR_INVALIDDATA;
47 
48  le = avio_rl32(s->pb);
49  if (le && le != 1)
50  return AVERROR_INVALIDDATA;
51 
52  if (le) {
53  sample_rate = avio_rl32(s->pb);
54  codec = avio_rl32(s->pb);
55  channels = avio_rl32(s->pb);
56  } else {
57  sample_rate = avio_rb32(s->pb);
58  codec = avio_rb32(s->pb);
59  channels = avio_rb32(s->pb);
60  }
61 
62  if (!channels || !sample_rate)
63  return AVERROR_INVALIDDATA;
64 
65  st = avformat_new_stream(s, NULL);
66  if (!st)
67  return AVERROR(ENOMEM);
68 
70  st->codecpar->channels = channels;
72  switch (codec) {
73  case 0:
75  break;
76  case 2:
78  break;
79  case 1:
80  avpriv_request_sample(s, "24-bit Paris PCM format");
81  default:
82  return AVERROR_INVALIDDATA;
83  }
84 
87 
88  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
89 
90  if (avio_skip(s->pb, 2024) < 0)
91  return AVERROR_INVALIDDATA;
92  return 0;
93 }
94 
96  .name = "epaf",
97  .long_name = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),
98  .read_probe = epaf_probe,
99  .read_header = epaf_read_header,
100  .read_packet = ff_pcm_read_packet,
101  .read_seek = ff_pcm_read_seek,
102  .extensions = "paf,fap",
103  .flags = AVFMT_GENERIC_INDEX,
104 };
#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:4507
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3953
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
Format I/O context.
Definition: avformat.h:1327
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:757
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4140
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:3452
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:726
#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:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
int block_align
Audio only.
Definition: avcodec.h:4070
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:39
uint8_t le
Definition: crc.c:295
Stream structure.
Definition: avformat.h:878
int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pcm.c:29
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1369
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:487
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
#define AV_RN32(p)
Definition: intreadwrite.h:364
int sample_rate
Audio only.
Definition: avcodec.h:4063
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
Main libavformat public API header.
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3995
int channels
Audio only.
Definition: avcodec.h:4059
static int epaf_probe(AVProbeData *p)
Definition: epafdec.c:27
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:662
AVCodecParameters * codecpar
Definition: avformat.h:1230
#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:95