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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* \file
*
* This file contains functions used by the DSF and DSDIFF decoders.
*
*/
#include "config.h"
#include "DsdLib.hxx"
#include "../DecoderAPI.hxx"
#include "input/InputStream.hxx"
#include "tag/TagId3.hxx"
#include "util/Error.hxx"
#include <string.h>
#ifdef ENABLE_ID3TAG
#include <id3tag.h>
#endif
bool
DsdId::Equals(const char *s) const
{
assert(s != nullptr);
assert(strlen(s) == sizeof(value));
return memcmp(value, s, sizeof(value)) == 0;
}
/**
* Skip the #input_stream to the specified offset.
*/
bool
dsdlib_skip_to(Decoder *decoder, InputStream &is,
offset_type offset)
{
if (is.IsSeekable())
return is.LockSeek(offset, IgnoreError());
if (is.GetOffset() > offset)
return false;
return dsdlib_skip(decoder, is, offset - is.GetOffset());
}
/**
* Skip some bytes from the #input_stream.
*/
bool
dsdlib_skip(Decoder *decoder, InputStream &is,
offset_type delta)
{
if (delta == 0)
return true;
if (is.IsSeekable())
return is.LockSeek(is.GetOffset() + delta, IgnoreError());
if (delta > 1024 * 1024)
/* don't skip more than one megabyte; it would be too
expensive */
return false;
return decoder_skip(decoder, is, delta);
}
bool
dsdlib_valid_freq(uint32_t samplefreq)
{
switch (samplefreq) {
case 2822400: /* DSD64, 64xFs, Fs = 44.100kHz */
case 3072000: /* DSD64 with Fs = 48.000 kHz */
case 5644800:
case 6144000:
case 11289600:
case 12288000:
case 22579200:/* DSD512 */
case 24576000:
return true;
default:
return false;
}
}
#ifdef ENABLE_ID3TAG
void
dsdlib_tag_id3(InputStream &is,
const struct tag_handler *handler,
void *handler_ctx, int64_t tagoffset)
{
assert(tagoffset >= 0);
if (tagoffset == 0 || !is.KnownSize())
return;
if (!dsdlib_skip_to(nullptr, is, tagoffset))
return;
/* Prevent broken files causing problems */
const auto size = is.GetSize();
const auto offset = is.GetOffset();
if (offset >= size)
return;
const id3_length_t count = size - offset;
/* Check and limit id3 tag size to prevent a stack overflow */
id3_byte_t dsdid3[4096];
if (count == 0 || count > sizeof(dsdid3))
return;
if (!decoder_read_full(nullptr, is, dsdid3, count))
return;
struct id3_tag *id3_tag = id3_tag_parse(dsdid3, count);
if (id3_tag == nullptr)
return;
scan_id3_tag(id3_tag, handler, handler_ctx);
id3_tag_delete(id3_tag);
return;
}
#endif
|
