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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
* Copyright 2003-2016 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.
*/
#include "config.h"
#include "Id3Load.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include "Riff.hxx"
#include "Aiff.hxx"
#include "input/InputStream.hxx"
#include <id3tag.h>
#include <algorithm>
static constexpr Domain id3_domain("id3");
static constexpr size_t ID3V1_SIZE = 128;
gcc_pure
static inline bool
tag_is_id3v1(struct id3_tag *tag)
{
return (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1) != 0;
}
static long
get_id3v2_footer_size(InputStream &is, offset_type offset)
{
id3_byte_t buf[ID3_TAG_QUERYSIZE];
if (!is.Seek(offset, IgnoreError()))
return 0;
if (!is.ReadFull(buf, sizeof(buf), IgnoreError()))
return 0;
return id3_tag_query(buf, sizeof(buf));
}
static UniqueId3Tag
ReadId3Tag(InputStream &is)
{
id3_byte_t query_buffer[ID3_TAG_QUERYSIZE];
if (!is.ReadFull(query_buffer, sizeof(query_buffer), IgnoreError()))
return nullptr;
/* Look for a tag header */
long tag_size = id3_tag_query(query_buffer, sizeof(query_buffer));
if (tag_size <= 0) return nullptr;
/* Found a tag. Allocate a buffer and read it in. */
if (size_t(tag_size) <= sizeof(query_buffer))
/* we have enough data already */
return UniqueId3Tag(id3_tag_parse(query_buffer, tag_size));
std::unique_ptr<id3_byte_t[]> tag_buffer(new id3_byte_t[tag_size]);
/* copy the start of the tag we already have to the allocated
buffer */
id3_byte_t *end = std::copy_n(query_buffer, sizeof(query_buffer),
tag_buffer.get());
/* now read the remaining bytes */
const size_t remaining = tag_size - sizeof(query_buffer);
const size_t nbytes = is.Read(end, remaining, IgnoreError());
if (nbytes != remaining)
return nullptr;
return UniqueId3Tag(id3_tag_parse(tag_buffer.get(), tag_size));
}
static UniqueId3Tag
ReadId3Tag(InputStream &is, off_t offset)
{
if (!is.Seek(offset, IgnoreError()))
return nullptr;
return ReadId3Tag(is);
}
static UniqueId3Tag
ReadId3v1Tag(InputStream &is)
{
id3_byte_t buffer[ID3V1_SIZE];
if (is.Read(buffer, ID3V1_SIZE, IgnoreError()) != ID3V1_SIZE)
return nullptr;
return UniqueId3Tag(id3_tag_parse(buffer, ID3V1_SIZE));
}
static UniqueId3Tag
ReadId3v1Tag(InputStream &is, off_t offset)
{
if (!is.Seek(offset, IgnoreError()))
return nullptr;
return ReadId3v1Tag(is);
}
static UniqueId3Tag
tag_id3_find_from_beginning(InputStream &is)
{
auto tag = ReadId3Tag(is);
if (!tag) {
return nullptr;
} else if (tag_is_id3v1(tag.get())) {
/* id3v1 tags don't belong here */
return nullptr;
}
/* We have an id3v2 tag, so let's look for SEEK frames */
id3_frame *frame;
while ((frame = id3_tag_findframe(tag.get(), "SEEK", 0))) {
/* Found a SEEK frame, get it's value */
int seek = id3_field_getint(id3_frame_field(frame, 0));
if (seek < 0)
break;
/* Get the tag specified by the SEEK frame */
auto seektag = ReadId3Tag(is, is.GetOffset() + seek);
if (!seektag || tag_is_id3v1(seektag.get()))
break;
/* Replace the old tag with the new one */
tag = std::move(seektag);
}
return tag;
}
static UniqueId3Tag
tag_id3_find_from_end(InputStream &is)
{
if (!is.KnownSize() || !is.CheapSeeking())
return nullptr;
const offset_type size = is.GetSize();
if (size < ID3V1_SIZE)
return nullptr;
offset_type offset = size - ID3V1_SIZE;
/* Get an id3v1 tag from the end of file for later use */
auto v1tag = ReadId3v1Tag(is, offset);
if (!v1tag)
offset = size;
/* Get the id3v2 tag size from the footer (located before v1tag) */
if (offset < ID3_TAG_QUERYSIZE)
return v1tag;
long tag_offset =
get_id3v2_footer_size(is, offset - ID3_TAG_QUERYSIZE);
if (tag_offset >= 0)
return v1tag;
offset_type tag_size = -tag_offset;
if (tag_size > offset)
return v1tag;
/* Get the tag which the footer belongs to */
auto tag = ReadId3Tag(is, offset - tag_size);
if (!tag)
return v1tag;
/* We have an id3v2 tag, so ditch v1tag */
return tag;
}
static UniqueId3Tag
tag_id3_riff_aiff_load(InputStream &is)
{
size_t size = riff_seek_id3(is);
if (size == 0)
size = aiff_seek_id3(is);
if (size == 0)
return nullptr;
if (size > 4 * 1024 * 1024)
/* too large, don't allocate so much memory */
return nullptr;
std::unique_ptr<id3_byte_t[]> buffer(new id3_byte_t[size]);
if (!is.ReadFull(buffer.get(), size, IgnoreError())) {
LogWarning(id3_domain, "Failed to read RIFF chunk");
return nullptr;
}
return UniqueId3Tag(id3_tag_parse(buffer.get(), size));
}
UniqueId3Tag
tag_id3_load(InputStream &is)
{
const ScopeLock protect(is.mutex);
auto tag = tag_id3_find_from_beginning(is);
if (tag == nullptr && is.CheapSeeking()) {
tag = tag_id3_riff_aiff_load(is);
if (tag == nullptr)
tag = tag_id3_find_from_end(is);
}
return tag;
}
|
