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pvfdec.c
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1 /*
2  * PVF 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 "avformat.h"
23 #include "internal.h"
24 #include "pcm.h"
25 
26 static int pvf_probe(AVProbeData *p)
27 {
28  if (!memcmp(p->buf, "PVF1\n", 5))
29  return AVPROBE_SCORE_MAX;
30  return 0;
31 }
32 
34 {
35  char buffer[32];
36  AVStream *st;
37  int bps, channels, sample_rate;
38 
39  avio_skip(s->pb, 5);
40  ff_get_line(s->pb, buffer, sizeof(buffer));
41  if (sscanf(buffer, "%d %d %d",
42  &channels,
43  &sample_rate,
44  &bps) != 3)
45  return AVERROR_INVALIDDATA;
46 
47  if (channels <= 0 || bps <= 0 || sample_rate <= 0)
48  return AVERROR_INVALIDDATA;
49 
50  st = avformat_new_stream(s, NULL);
51  if (!st)
52  return AVERROR(ENOMEM);
53 
55  st->codec->channels = channels;
57  st->codec->codec_id = ff_get_pcm_codec_id(bps, 0, 1, 0xFFFF);
59  st->codec->block_align = bps * st->codec->channels / 8;
60 
61  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
62 
63  return 0;
64 }
65 
67  .name = "pvf",
68  .long_name = NULL_IF_CONFIG_SMALL("PVF (Portable Voice Format)"),
69  .read_probe = pvf_probe,
70  .read_header = pvf_read_header,
71  .read_packet = ff_pcm_read_packet,
72  .read_seek = ff_pcm_read_seek,
73  .extensions = "pvf",
74  .flags = AVFMT_GENERIC_INDEX,
75 };