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List:       taglib-devel
Subject:    Re: Cover of flac file
From:       Lukáš Lalinský <lalinsky () gmail ! com>
Date:       2012-10-23 20:41:28
Message-ID: CAGUtLj9crZoq816SasZrtTd=qnJ1eTgm9bDxP0GPL66S=+=GvQ () mail ! gmail ! com
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On Tue, Oct 23, 2012 at 9:25 PM, grisha <grish.vanika@gmail.com> wrote:
> I'm so sorry, but i can't understand what it means "base64-decode the field".
> Which field ? I found writing picture using base64 encoding
> https://gist.github.com/1468279, begin from line 131
> but i need to extract picture.

Well, it's exactly the reverse process.

You know that the image is in the Vorbis Comment under the name
"METADATA_BLOCK_PICTURE", so you need to get that field. The field is
encoded using base64, so you need to decide it to binary data. Once
you have the binary data, you pass it to the TagLib::FLAC::Picture
constructor.

TagLib::Ogg::XiphComment *tag = file.xiphComment();
if (tag->contains(""METADATA_BLOCK_PICTURE"")) {
  TagLib::String encodedData =
tag->fieldListMap()["METADATA_BLOCK_PICTURE"].front();
  TagLib::ByteVector data = someBase64DecodeFunction(encodedData);
  TagLib::FLAC::Picture *picture = new TagLib::FLAC::Picture(data);
  // do something with the picture
}

Lukas
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