[prev in list] [next in list] [prev in thread] [next in thread] 

List:       taglib-devel
Subject:    Re: Reading ID3v2 tag from byte array
From:       Lukáš Lalinský <lalinsky () gmail ! com>
Date:       2013-04-15 7:23:45
Message-ID: CAGUtLj_8GV0CSbxKCWyc9p_XLZK1AY7xSEC1BmdtVjuZWKy7ZQ () mail ! gmail ! com
[Download RAW message or body]

I'm not sure about the segfault, but the best way to do this in TagLib
1.8 is to use the new IOStream API.

You construct a ByteVectorStream with the complete tag data, and then
create a MPEG file instance with stream instead of a file name.

http://taglib.github.io/api/classTagLib_1_1ByteVectorStream.html
http://taglib.github.io/api/classTagLib_1_1MPEG_1_1File.html#ad3ac226309beb3989abf70b9ff02ed2f

Lukas

On Thu, Mar 7, 2013 at 9:40 PM, Jack Oclee-Brown
<jack.ocleebrown@googlemail.com> wrote:
> Hi,
>
> I was wondering if it was possible to read an ID3v2 tag directly from a byte
> array and use TabLib to extract the artist, title etc.
>
> I've had a first attempt but after initially looking promising I keep
> getting segmentation faults when I try and extract "artist" to a variable.
>
> I have written a small CPP class extending TagLib::ID3v2::Tag
>
>
>
> #ifndef DSFTAG_H
> #define DSFTAG_H
>
> #include <taglib/id3v2tag.h>
>
>
> class dsfTag : public TagLib::ID3v2::Tag
> {
> public:
>     dsfTag(char* data,long unsigned int dataLen) : TagLib::ID3v2::Tag() {
>         TagLib::ByteVector b =
> TagLib::ByteVector::fromCString(data,dataLen);
>         parse(b);
>     };
> };
>
> #endif // DSFTAG_H
>
>
>
>
> when I try to use the class I can successfully create the object and output
> tags to cout, for example with:
>
> dsfTag t(tag,tagLen);
> cout << t.album();
>
>
> but I get segfaults when I try and put album() into a char* or string. And I
> also see segfaults or core dumps if I free the original byte array.
>
>
> I'd be very grateful if anyone can point me in the right direction.
>
> Thanks! Jack.
>
>
>
>
>
>
> _______________________________________________
> taglib-devel mailing list
> taglib-devel@kde.org
> https://mail.kde.org/mailman/listinfo/taglib-devel
>
_______________________________________________
taglib-devel mailing list
taglib-devel@kde.org
https://mail.kde.org/mailman/listinfo/taglib-devel
[prev in list] [next in list] [prev in thread] [next in thread]