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JavaScript-ID3-Reader/src/id3v2frames.js at master · java1178958967/JavaScript-ID3-Reader · GitHub
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id3v2frames.js
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id3v2frames.js
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/*
* JavaScript ID3 Tag Reader 1.0.0
* Copyright (c) 2009 Opera Software ASA, António Afonso (antonio.afonso@opera.com)
* Modified by António Afonso <antonio.afonso gmail.com>
*/
var
ID3v2
=
{
readFrameData
:
{
}
}
;
var
pictureType
=
[
"32x32 pixels 'file icon' (PNG only)"
,
"Other file icon"
,
"Cover (front)"
,
"Cover (back)"
,
"Leaflet page"
,
"Media (e.g. lable side of CD)"
,
"Lead artist/lead performer/soloist"
,
"Artist/performer"
,
"Conductor"
,
"Band/Orchestra"
,
"Composer"
,
"Lyricist/text writer"
,
"Recording Location"
,
"During recording"
,
"During performance"
,
"Movie/video screen capture"
,
"A bright coloured fish"
,
"Illustration"
,
"Band/artist logotype"
,
"Publisher/Studio logotype"
]
;
function
getTextEncoding
(
bite
)
{
var
charset
;
switch
(
bite
)
{
case
0x00
:
charset
=
'iso-8859-1'
;
break
;
case
0x01
:
charset
=
'utf-16'
;
break
;
case
0x02
:
charset
=
'utf-16be'
;
break
;
case
0x03
:
charset
=
'utf-8'
;
break
;
}
return
charset
;
}
function
getTime
(
duration
)
{
var
duration
=
duration
/
1000
,
seconds
=
Math
.
floor
(
duration
)
%
60
,
minutes
=
Math
.
floor
(
duration
/
60
)
%
60
,
hours
=
Math
.
floor
(
duration
/
3600
)
;
return
{
seconds
:
seconds
,
minutes
:
minutes
,
hours
:
hours
}
;
}
function
formatTime
(
time
)
{
var
seconds
=
time
.
seconds
<
10
?
'0'
+
time
.
seconds
:
time
.
seconds
;
var
minutes
=
(
time
.
hours
>
0
&&
time
.
minutes
<
10
)
?
'0'
+
time
.
minutes
:
time
.
minutes
;
return
(
time
.
hours
>
0
?
time
.
hours
+
':'
:
''
)
+
minutes
+
':'
+
seconds
;
}
ID3v2
.
readFrameData
[
'APIC'
]
=
function
readPictureFrame
(
offset
,
length
,
data
,
flags
,
v
)
{
v
=
v
||
'3'
;
var
start
=
offset
;
var
charset
=
getTextEncoding
(
data
.
getByteAt
(
offset
)
)
;
switch
(
v
)
{
case
'2'
:
var
format
=
data
.
getStringAt
(
offset
+
1
,
3
)
;
offset
+=
4
;
break
;
case
'3'
:
case
'4'
:
var
format
=
data
.
getStringWithCharsetAt
(
offset
+
1
,
length
-
(
offset
-
start
)
,
''
)
;
offset
+=
1
+
format
.
bytesReadCount
;
break
;
}
var
bite
=
data
.
getByteAt
(
offset
,
1
)
;
var
type
=
pictureType
[
bite
]
;
var
desc
=
data
.
getStringWithCharsetAt
(
offset
+
1
,
length
-
(
offset
-
start
)
,
charset
)
;
offset
+=
1
+
desc
.
bytesReadCount
;
return
{
"format"
:
format
.
toString
(
)
,
"type"
:
type
,
"description"
:
desc
.
toString
(
)
,
"data"
:
data
.
getBytesAt
(
offset
,
(
start
+
length
)
-
offset
)
}
;
}
;
ID3v2
.
readFrameData
[
'COMM'
]
=
function
readCommentsFrame
(
offset
,
length
,
data
)
{
var
start
=
offset
;
var
charset
=
getTextEncoding
(
data
.
getByteAt
(
offset
)
)
;
var
language
=
data
.
getStringAt
(
offset
+
1
,
3
)
;
var
shortdesc
=
data
.
getStringWithCharsetAt
(
offset
+
4
,
length
-
4
,
charset
)
;
offset
+=
4
+
shortdesc
.
bytesReadCount
;
var
text
=
data
.
getStringWithCharsetAt
(
offset
,
(
start
+
length
)
-
offset
,
charset
)
;
return
{
language
:
language
,
short_description
:
shortdesc
.
toString
(
)
,
text
:
text
.
toString
(
)
}
;
}
;
ID3v2
.
readFrameData
[
'COM'
]
=
ID3v2
.
readFrameData
[
'COMM'
]
;
ID3v2
.
readFrameData
[
'PIC'
]
=
function
(
offset
,
length
,
data
,
flags
)
{
return
ID3v2
.
readFrameData
[
'APIC'
]
(
offset
,
length
,
data
,
flags
,
'2'
)
;
}
;
ID3v2
.
readFrameData
[
'PCNT'
]
=
function
readCounterFrame
(
offset
,
length
,
data
)
{
// FIXME: implement the rest of the spec
return
data
.
getInteger32At
(
offset
)
;
}
;
ID3v2
.
readFrameData
[
'CNT'
]
=
ID3v2
.
readFrameData
[
'PCNT'
]
;
ID3v2
.
readFrameData
[
'T*'
]
=
function
readTextFrame
(
offset
,
length
,
data
)
{
var
charset
=
getTextEncoding
(
data
.
getByteAt
(
offset
)
)
;
return
data
.
getStringWithCharsetAt
(
offset
+
1
,
length
-
1
,
charset
)
.
toString
(
)
;
}
;
ID3v2
.
readFrameData
[
'TCON'
]
=
function
readGenreFrame
(
offset
,
length
,
data
)
{
var
text
=
ID3v2
.
readFrameData
[
'T*'
]
.
apply
(
this
,
arguments
)
;
return
text
.
replace
(
/
^
\(
\d
+
\)
/
,
''
)
;
}
;
ID3v2
.
readFrameData
[
'TCO'
]
=
ID3v2
.
readFrameData
[
'TCON'
]
;
//ID3v2.readFrameData['TLEN'] = function readLengthFrame(offset, length, data) {
// var text = ID3v2.readFrameData['T*'].apply( this, arguments );
//
// return {
// text : text,
// parsed : formatTime( getTime(parseInt(text)) )
// };
//};
ID3v2
.
readFrameData
[
'USLT'
]
=
function
readLyricsFrame
(
offset
,
length
,
data
)
{
var
start
=
offset
;
var
charset
=
getTextEncoding
(
data
.
getByteAt
(
offset
)
)
;
var
language
=
data
.
getStringAt
(
offset
+
1
,
3
)
;
var
descriptor
=
data
.
getStringWithCharsetAt
(
offset
+
4
,
length
-
4
,
charset
)
;
offset
+=
4
+
descriptor
.
bytesReadCount
;
var
lyrics
=
data
.
getStringWithCharsetAt
(
offset
,
(
start
+
length
)
-
offset
,
charset
)
;
return
{
language
:
language
,
descriptor
:
descriptor
.
toString
(
)
,
lyrics
:
lyrics
.
toString
(
)
}
;
}
;
ID3v2
.
readFrameData
[
'ULT'
]
=
ID3v2
.
readFrameData
[
'USLT'
]
;
module
.
exports
=
ID3v2
;
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