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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  st->codec->extradata_size = 1;
43 
45  if (!st->codec->extradata)
46  return AVERROR(ENOMEM);
47  st->codec->extradata[0] = 8 * st->codec->channels;
48 
49  c->data_end = avio_rb32(s->pb) + 32LL;
50  st->duration = avio_rb32(s->pb);
51  st->codec->sample_rate = avio_rb16(s->pb);
52  avio_skip(s->pb, 22);
53  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
54 
55  return 0;
56 }
57 
59 {
61  int64_t size;
62  int ret;
63 
64  size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128);
65  if (size <= 0)
66  return AVERROR_EOF;
67 
68  ret = av_get_packet(s->pb, pkt, size);
69  pkt->stream_index = 0;
70  return ret;
71 }
72 
74  .name = "afc",
75  .long_name = NULL_IF_CONFIG_SMALL("AFC"),
76  .priv_data_size = sizeof(AFCDemuxContext),
79  .extensions = "afc",
81 };