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List: taglib-devel
Subject: Re: Question about taglib abilities
From: Christian Convey <christian.convey () gmail ! com>
Date: 2012-07-15 18:15:09
Message-ID: CAPfS4Zwu+VL6ikONKU3k4p_Zo5K1PZSmuxJUSwggLv5OnzsNqA () mail ! gmail ! com
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I see. Thanks very much for the help.
On Sun, Jul 15, 2012 at 1:55 PM, Антон Сергунов <setosha@gmail.com> wrote:
> Yes.
>
> Usually id3 tag has both id3v1 and id3v2 tags.
>
> Id3v1 should have all text fields latin1 encoded.
> But by historical reasons it usual (thanks to winamp player) has local
> windows encoding.
> Because it was only way to save non latin1 strings.
>
> so tagLib has TagLib::ID3v1::Tag::setStringHandler() function to overwrite
> id3v1 string encoder.
>
>
> id3v2 has encoding field and can use unicode-16 utf-8.
> But I saw my own eyes id3v2 fields saved this way.
> I think some software translte id3v1 tags to id3v2 as is.
>
> That's why a told you to check TagLib::String::isLatin1 and then convert to
> unicode from user's local windows encoding.
>
> 2012/7/16 Christian Convey <christian.convey@gmail.com>
>>
>> So is the following correct regarding libtag, and mp3 files using
>> ID3v2.2? (Please forgive me if I'm getting too off-topic of libtag.
>> I'll stop asking whenever you like.)
>>
>> The "latin1" coding, strictly speaking, refers to ISO 8859-1.
>>
>> What Microsoft calls "cp1250" and "cp1252" are also eight-bit
>> character encodings. These two encodings are consistent with ISO
>> 8859-1, but they are supersets of 8859-1.
>>
>> When an ID3v2.2 tag has a field (such as Title) encoded in cp1250 or
>> cp1252, the field's "type" byte will indicate that the "latin1"
>> encoding is being used. However, there is not enough information in
>> the ID3 metadata to know with certainty whether the actual code page
>> is cp1250, cp1252, or something else.
>>
>> Is that it?
>>
>> Thanks again.
>> - Christian
>>
>> On Sun, Jul 15, 2012 at 12:40 PM, Антон Сергунов <setosha@gmail.com>
>> wrote:
>> > windows cp1250 or cp1252 for german
>> >
>> >
>> > 2012/7/15 Christian Convey <christian.convey@gmail.com>
>> >>
>> >> Thanks very much, that's a big help.
>> >>
>> >> Do you happen to know if it's common for MP3 tagging software to use
>> >> character encodings *other than* the five valid ID3v2 encodings
>> >> (latin1, UTF16, UTF16BE, UTF16LE, and UTF8) ?
>> >>
>> >> I'm trying to anticipate how many different character encodings I'll
>> >> have to try out when debugging this MP3 file.
>> >>
>> >> Thanks,
>> >> Christian
>> >>
>> >> On Sun, Jul 15, 2012 at 11:27 AM, Антон Сергунов <setosha@gmail.com>
>> >> wrote:
>> >> > TagLib doesn't convert strings. It read encoding (String::Type) and
>> >> > raw
>> >> > data
>> >> > (ByteArray) from file.
>> >> > You can then perform conversion with String::toWString() but before
>> >> > it
>> >> > contains raw byte data from file.
>> >> >
>> >> > But I can't find function to get type enum here.
>> >> > So you can get raw data with String::data(Type t)
>> >> >
>> >> >
>> >> > 2012/7/15 Christian Convey <christian.convey@gmail.com>
>> >> >>
>> >> >> Thanks. But this is actually a podcast run by someone else:
>> >> >> http://www.dw.de/dw/0,,2548,00.html
>> >> >>
>> >> >> So actually fixing the problem is outside of my power. What I'd
>> >> >> like
>> >> >> to do is research the problem with their mp3 files carefully, so
>> >> >> that
>> >> >> I can tell them precisely with the problem is.
>> >> >>
>> >> >> (For example, "Your mp3 tagging software is claiming that the text
>> >> >> is
>> >> >> encoded using UTF-8, but it's actually UTF-16.")
>> >> >>
>> >> >> On Sun, Jul 15, 2012 at 10:52 AM, Антон Сергунов <setosha@gmail.com>
>> >> >> wrote:
>> >> >> > Most common id3 encoding problem is using local 8bit win encoding
>> >> >> > in
>> >> >> > Latin1
>> >> >> > fields. You can use special Latin1 handler or (better works for
>> >> >> > me)
>> >> >> > if
>> >> >> > string is in Latin1 convert it to local 8 bit windows encoding.
>> >> >> >
>> >> >> > 15.07.2012 21:35 пользователь "Christian Convey"
>> >> >> > <christian.convey@gmail.com> написал:
>> >> >> >>
>> >> >> >> I'm new to ID3 tag handling. Can you tell me if taglib can be
>> >> >> >> used
>> >> >> >> to
>> >> >> >> solve a particular problem?
>> >> >> >>
>> >> >> >> I have MP3 files frm a podcast, and I suspect that there's an
>> >> >> >> inconsistency between the actual encoding of the ID3v2.2 Title
>> >> >> >> field,
>> >> >> >> and the byte that states what encoding is used for that string.
>> >> >> >>
>> >> >> >> Can taglib tell me which encoding the file *claims* to have for
>> >> >> >> that
>> >> >> >> field?
>> >> >> >>
>> >> >> >> And can I get taglib to give me the bytes in the ID3v2.2 Title
>> >> >> >> field
>> >> >> >> *without* taglib automatically performing some kind of
>> >> >> >> character-encoding translation?
>> >> >> >> _______________________________________________
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>> >> >> >> https://mail.kde.org/mailman/listinfo/taglib-devel
>> >> >> >
>> >> >> >
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