1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* OSQ demuxer
* Copyright (c) 2023 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avio_internal.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "rawdec.h"
static int osq_probe(const AVProbeData *p)
{
if (AV_RL32(p->buf) != MKTAG('O','S','Q',' '))
return 0;
if (AV_RL32(p->buf + 4) != 48)
return 0;
if (AV_RL16(p->buf + 8) != 1)
return 0;
if (p->buf[10] == 0)
return 0;
if (p->buf[11] == 0)
return 0;
if (AV_RL32(p->buf + 12) == 0)
return 0;
if (AV_RL16(p->buf + 16) == 0)
return 0;
return AVPROBE_SCORE_MAX;
}
static int osq_read_header(AVFormatContext *s)
{
uint32_t t, size;
AVStream *st;
int ret;
t = avio_rl32(s->pb);
if (t != MKTAG('O','S','Q',' '))
return AVERROR_INVALIDDATA;
size = avio_rl32(s->pb);
if (size != 48)
return AVERROR_INVALIDDATA;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
return ret;
t = avio_rl32(s->pb);
if (t != MKTAG('R','I','F','F'))
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 8);
t = avio_rl32(s->pb);
if (t != MKTAG('f','m','t',' '))
return AVERROR_INVALIDDATA;
size = avio_rl32(s->pb);
avio_skip(s->pb, size);
t = avio_rl32(s->pb);
size = avio_rl32(s->pb);
while (t != MKTAG('d','a','t','a')) {
avio_skip(s->pb, size);
t = avio_rl32(s->pb);
size = avio_rl32(s->pb);
if (avio_feof(s->pb))
return AVERROR_INVALIDDATA;
}
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_OSQ;
st->codecpar->sample_rate = AV_RL32(st->codecpar->extradata + 4);
if (st->codecpar->sample_rate <= 0)
return AVERROR_INVALIDDATA;
st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
st->codecpar->ch_layout.nb_channels = st->codecpar->extradata[3];
if (st->codecpar->ch_layout.nb_channels == 0)
return AVERROR_INVALIDDATA;
st->start_time = 0;
st->duration = AV_RL32(st->codecpar->extradata + 16);
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
const FFInputFormat ff_osq_demuxer = {
.p.name = "osq",
.p.long_name = NULL_IF_CONFIG_SMALL("raw OSQ"),
.p.extensions = "osq",
.p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
.p.priv_class = &ff_raw_demuxer_class,
.read_probe = osq_probe,
.read_header = osq_read_header,
.read_packet = ff_raw_read_partial_packet,
.raw_codec_id = AV_CODEC_ID_OSQ,
.priv_data_size = sizeof(FFRawDemuxerContext),
};
|
