1/*
2 * IRCAM 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#include "ircam.h"
27
28static int ircam_probe(AVProbeData *p)
29{
30    if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 &&
31         p->buf[2] >=    1 && p->buf[2] <= 4) ||
32        (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 &&
33         p->buf[1] >=    1 && p->buf[1] <= 3) &&
34        AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8))
35        return AVPROBE_SCORE_MAX / 4 * 3;
36    return 0;
37}
38
39static const struct endianess {
40    uint32_t magic;
41    int      is_le;
42} table[] = {
43  { 0x64A30100, 0 },
44  { 0x64A30200, 1 },
45  { 0x64A30300, 0 },
46  { 0x64A30400, 1 },
47  { 0x0001A364, 1 },
48  { 0x0002A364, 0 },
49  { 0x0003A364, 1 },
50};
51
52static int ircam_read_header(AVFormatContext *s)
53{
54    uint32_t magic, sample_rate, channels, tag;
55    const AVCodecTag *tags;
56    int le = -1, i;
57    AVStream *st;
58
59    magic = avio_rl32(s->pb);
60    for (i = 0; i < 7; i++) {
61        if (magic == table[i].magic) {
62            le = table[i].is_le;
63            break;
64        }
65    }
66
67    if (le == 1) {
68        sample_rate = av_int2float(avio_rl32(s->pb));
69        channels    = avio_rl32(s->pb);
70        tag         = avio_rl32(s->pb);
71        tags        = ff_codec_ircam_le_tags;
72    } else if (le == 0) {
73        sample_rate = av_int2float(avio_rb32(s->pb));
74        channels    = avio_rb32(s->pb);
75        tag         = avio_rb32(s->pb);
76        tags        = ff_codec_ircam_be_tags;
77    } else {
78        return AVERROR_INVALIDDATA;
79    }
80
81    if (!channels || !sample_rate)
82        return AVERROR_INVALIDDATA;
83
84    st = avformat_new_stream(s, NULL);
85    if (!st)
86        return AVERROR(ENOMEM);
87
88    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
89    st->codec->channels    = channels;
90    st->codec->sample_rate = sample_rate;
91
92    st->codec->codec_id = ff_codec_get_id(tags, tag);
93    if (st->codec->codec_id == AV_CODEC_ID_NONE) {
94        av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag);
95        return AVERROR_INVALIDDATA;
96    }
97
98    st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
99    st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
100    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
101    avio_skip(s->pb, 1008);
102
103    return 0;
104}
105
106AVInputFormat ff_ircam_demuxer = {
107    .name           = "ircam",
108    .long_name      = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
109    .read_probe     = ircam_probe,
110    .read_header    = ircam_read_header,
111    .read_packet    = ff_pcm_read_packet,
112    .read_seek      = ff_pcm_read_seek,
113    .extensions     = "sf,ircam",
114    .flags          = AVFMT_GENERIC_INDEX,
115};
116