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
27static 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
39static int epaf_read_header(AVFormatContext *s)
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
69    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
70    st->codec->channels    = channels;
71    st->codec->sample_rate = sample_rate;
72    switch (codec) {
73    case 0:
74        st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
75        break;
76    case 2:
77        st->codec->codec_id = AV_CODEC_ID_PCM_S8;
78        break;
79    case 1:
80        avpriv_request_sample(s, "24-bit Paris PCM format");
81    default:
82        return AVERROR_INVALIDDATA;
83    }
84
85    st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
86    st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
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
95AVInputFormat ff_epaf_demuxer = {
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};
105