no inputstream?

[John Krukoff]

On Thu, 2008-05-15 at 17:11 -0600, John Krukoff wrote:
> On Thu, 2008-05-15 at 15:35 -0700, max wrote:
> > On May 15, 6:18 pm, MRAB <goo... at mrabarnett.plus.com> wrote:
> > > On May 15, 9:00 pm, max <maxwell.newla... at gmail.com> wrote:
> > >
> > > > you're right, my java implementation does indeed parse for Id3v2
> > > > (sorry for the confusion).  i'm using the getrawid3v2() method of this
> > > > bitstream class (http://www.javazoom.net/javalayer/docs/docs0.4/
> > > > javazoom/jl/decoder/Bitstream.html) to return an inputstream that then
> > > > i buffer and parse.  apologies if i misrepresented my code!
> > >
> > > > back to python, i wonder if i'm misusing the mutagen id3 module.  this
> > > > brief tutorial (http://www.sacredchao.net/quodlibet/wiki/Development/
> > > > Mutagen/Tutorial) leads me to believe that something like this might
> > > > work:
> > >
> > > > from mutagen.mp3 import MP3
> > > > id3tags = MP3(urllib2.urlopen(URL))
> > >
> > > > but this gives me the following TypeError: "coercing to Unicode: need
> > > > string or buffer, instance found".  does this mean i need to convert
> > > > the "file-like object" that is returned by urlopen() into a unicode
> > > > object?  if so, do i just decode() with 'utf-8', or is this more
> > > > complex?  as of now, doing so gives me mostly "No such file or
> > > > directory" errors, with a few HTTP 404s.
> > >
> > > [snip]
> > > I think it's expecting the path of the MP3 but you're giving it the
> > > contents.
> > 
> > cool, so how do i give it the path, if not in the form of a URL
> > string?  maybe this is obvious...
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> 
> It doesn't look like you can, with mutagen. So, time to find a different
> library that supports arbitrary file objects instead of only file paths.
> I'd suggest starting here:
> http://pypi.python.org/pypi?%3Aaction=search&term=id3&submit=search
> 
> Possibly one with actual documentation, since that would also be a step
> up from mutagen.
> 

After a bit of time looking around, looks like nearly all the python id3
modules expect to work with filenames, instead of file objects.

I can't vouch for it, and the documentation still looks sparse, but this
module at least looks capable of accepting a file object:
http://pypi.python.org/pypi/tagpy

Looks like it'd be a challenge to build if you're on windows, since it
depends on an external library.

Alternately, you could probably create a subclass of the mutagen stuff
that used an existing file object instead of opening a new one. No idea
what that might break, but seems like it would be worth a try.

As last ditch option, could write the first few kb of the file out to a
temp file and see if mutagen will load the partial file.

-- 
John Krukoff <jkrukoff at ltgc.com>
Land Title Guarantee Company