1 /*
2 * Copyright (c) 2015 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "avformat.h"
22 #include "internal.h"
23 #include "pcm.h"
24
wve_probe(const AVProbeData * p)25 static int wve_probe(const AVProbeData *p)
26 {
27 if (memcmp(p->buf, "ALawSoundFile**\0\017\020", 18) ||
28 memcmp(p->buf + 22, "\0\0\0\1\0\0\0\0\0\0", 10))
29 return 0;
30 return AVPROBE_SCORE_MAX;
31 }
32
wve_read_header(AVFormatContext * s)33 static int wve_read_header(AVFormatContext *s)
34 {
35 AVStream *st;
36
37 st = avformat_new_stream(s, NULL);
38 if (!st)
39 return AVERROR(ENOMEM);
40
41 avio_skip(s->pb, 18);
42 st->duration = avio_rb32(s->pb);
43 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
44 st->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW;
45 st->codecpar->sample_rate = 8000;
46 st->codecpar->channels = 1;
47 st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);
48 st->codecpar->block_align = st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8;
49 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
50 avio_skip(s->pb, 10);
51
52 return 0;
53 }
54
55 AVInputFormat ff_wve_demuxer = {
56 .name = "wve",
57 .long_name = NULL_IF_CONFIG_SMALL("Psion 3 audio"),
58 .read_probe = wve_probe,
59 .read_header = wve_read_header,
60 .read_packet = ff_pcm_read_packet,
61 .read_seek = ff_pcm_read_seek,
62 };
63