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
ircam_probe(AVProbeData * p)28 static 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
39 static 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
ircam_read_header(AVFormatContext * s)52 static 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
106 AVInputFormat 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