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afc.c
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1 /*
2  * AFC 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 
23 #include "avformat.h"
24 #include "internal.h"
25 
26 typedef struct AFCDemuxContext {
27  int64_t data_end;
29 
31 {
33  AVStream *st;
34 
35  st = avformat_new_stream(s, NULL);
36  if (!st)
37  return AVERROR(ENOMEM);
40  st->codec->channels = 2;
42 
43  if (ff_alloc_extradata(st->codec, 1))
44  return AVERROR(ENOMEM);
45  st->codec->extradata[0] = 8 * st->codec->channels;
46 
47  c->data_end = avio_rb32(s->pb) + 32LL;
48  st->duration = avio_rb32(s->pb);
49  st->codec->sample_rate = avio_rb16(s->pb);
50  avio_skip(s->pb, 22);
51  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
52 
53  return 0;
54 }
55 
57 {
59  int64_t size;
60  int ret;
61 
62  size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128);
63  if (size <= 0)
64  return AVERROR_EOF;
65 
66  ret = av_get_packet(s->pb, pkt, size);
67  pkt->stream_index = 0;
68  return ret;
69 }
70 
72  .name = "afc",
73  .long_name = NULL_IF_CONFIG_SMALL("AFC"),
74  .priv_data_size = sizeof(AFCDemuxContext),
77  .extensions = "afc",
79 };