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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->codec->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->codec->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 };