[Flac-dev] reading vorbis comments with FLAC++?

[Josh Coalson]

--- Joshua Kwan <joshk at triplehelix.org> wrote:
> Well, I'm quite frankly stumped. I'm writing a program that recurses
> into directories and reads (among others) FLAC files and should be
> able
> to read the vorbis comments ARTIST and TITLE from the file.
> 
> A while back, I was popen()ing to metaflac, because I didn't want to
> mess with libFLAC. But now, it's the weekend, so I can mess around
> with
> this. Here's the code in question:
...
> When I run this code, I get a SEGV during get_comment because
> object_->data.vorbis_comment.comments is junk. Must I initialize it
> somewhere? Note that vc.get_num_comments returns 14, which I imagine
> is
> a correct number. The documentation isn't overly clear about how this
> works
> and it would be cooler if some basic examples could be provided.
> 
> Thanks in advance for any help that can be provided. Excuse my
> ignorance! :(

it's in the API docs; here's one link:

http://flac.sourceforge.net/api/group__flac__metadata__level1.html#_details

The C++ interface is a little simpler:

FLAC::Metadata::SimpleIterator it;
if (it.is_valid()) {
   if (it.init(filename, true, true)) {
      FLAC::Metadata::VorbisComment *vc = 0;
      do {
         if (it.get_block_type() ==
::FLAC__METADATA_TYPE_VORBIS_COMMENT) {
            vc =
dynamic_cast<FLAC::Metadata::VorbisComment*>(it.get_block());
            assert(0 != vc);
         }
      } while (!vc && it.next());
      //use vc
      delete vc;
   }
}

maybe I should add a shorthand function similar to
flac__metadata_get_streaminfo()

Josh


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