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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Dave Chapman
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <inttypes.h>
#include "platform.h"
#include "metadata.h"
#include "metadata_common.h"
#include "metadata_parsers.h"
#include "logf.h"
bool get_flac_metadata(int fd, struct mp3entry* id3)
{
/* A simple parser to read vital metadata from a FLAC file - length,
* frequency, bitrate etc. This code should either be moved to a
* seperate file, or discarded in favour of the libFLAC code.
* The FLAC stream specification can be found at
* http://flac.sourceforge.net/format.html#stream
*/
/* Use the trackname part of the id3 structure as a temporary buffer */
unsigned char* buf = (unsigned char *)id3->path;
bool last_metadata = false;
bool rc = false;
if (!skip_id3v2(fd, id3) || (read(fd, buf, 4) < 4))
{
return rc;
}
if (memcmp(buf, "fLaC", 4) != 0)
{
return rc;
}
while (!last_metadata)
{
unsigned long i;
int type;
if (read(fd, buf, 4) != 4)
{
return rc;
}
last_metadata = buf[0] & 0x80;
type = buf[0] & 0x7f;
/* The length of the block */
i = (buf[1] << 16) | (buf[2] << 8) | buf[3];
if (type == 0) /* 0 is the STREAMINFO block */
{
unsigned long totalsamples;
if (i >= sizeof(id3->path) || read(fd, buf, i) != (int)i)
{
return rc;
}
id3->vbr = true; /* All FLAC files are VBR */
id3->filesize = filesize(fd);
id3->frequency = (buf[10] << 12) | (buf[11] << 4)
| ((buf[12] & 0xf0) >> 4);
rc = true; /* Got vital metadata */
/* totalsamples is a 36-bit field, but we assume <= 32 bits are used */
totalsamples = get_long_be(&buf[14]);
if(totalsamples > 0)
{
/* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
id3->bitrate = (id3->filesize * 8) / id3->length;
}
else if (totalsamples == 0)
{
id3->length = 0;
id3->bitrate = 0;
}
else
{
logf("flac length invalid!");
return false;
}
}
else if (type == 4) /* 4 is the VORBIS_COMMENT block */
{
/* The next i bytes of the file contain the VORBIS COMMENTS. */
if (read_vorbis_tags(fd, id3, i) == 0)
{
return rc;
}
}
#ifdef HAVE_ALBUMART
else if (type == 6) /* 6 is the PICTURE block */
{
if(!id3->has_embedded_albumart) /* only use the first PICTURE */
{
unsigned int buf_size = MIN(sizeof(id3->path), i);
int picframe_pos = 4; /* skip picture type */
int mime_length, description_length;
id3->albumart.pos = lseek(fd, 0, SEEK_CUR);
int bytes_read = read(fd, buf, buf_size);
buf[buf_size-1] = '\0';
i -= bytes_read;
if (bytes_read <= picframe_pos + 4) /* get_long_be expects 4 chars */
{
logf("flac picture length invalid!");
return false;
}
mime_length = get_long_be(&buf[picframe_pos]);
char *mime = buf + picframe_pos + 4;
picframe_pos += 4 + mime_length;
if (bytes_read < picframe_pos)
{
logf("flac picture length invalid!");
return false;
}
id3->albumart.type = AA_TYPE_UNKNOWN;
if (memcmp(mime, "image/", 6) == 0)
{
mime += 6;
if (strcmp(mime, "jpeg") == 0 || strcmp(mime, "jpg") == 0){
id3->albumart.type = AA_TYPE_JPG;
}else if (strcmp(mime, "png") == 0)
id3->albumart.type = AA_TYPE_PNG;
}
description_length = get_long_be(&buf[picframe_pos]);
/* 16 = skip picture width,height,color-depth,color-used */
picframe_pos += 4 + description_length + 16;
/* if we support the format and image length is in the buffer */
if(id3->albumart.type != AA_TYPE_UNKNOWN
&& (picframe_pos + 4) - buf_size > 0)
{
id3->has_embedded_albumart = true;
id3->albumart.size = get_long_be(&buf[picframe_pos]);
id3->albumart.pos += picframe_pos + 4;
}
}
if (lseek(fd, i, SEEK_CUR) < 0)
{
return rc;
}
}
#endif
else if (!last_metadata)
{
/* Skip to next metadata block */
if (lseek(fd, i, SEEK_CUR) < 0)
{
return rc;
}
}
}
return true;
}
|
