[vorbis] tool for listening tests

[Jack Moffitt]

> > Not sure about the MP3 decoder - you'd have to ask the author of the bass
> > library about that. I know there's a wide variation between the different
> > encoders, but is there any real difference (in terms of sound quality)
> > between the various decoders?
> 
> There shouldn't be any difference on the decoder (except minor rounding
> issues).  Once the stream has been encoded, there is pretty much one correct
> decoding (plus or minus one on the occasional sample).

MP3 decoders should be bit-for-bit accurate, I believe.  Mark Taylor had
tested this at one point while he was fixing bugs in lame (some turned
out to be decoder bugs).

Vorbis decoders should vary in roundoff error, but this has no impact on
quality.  Since every vorbis decoder (except jorbis and the hipzip one)
is basically the same except for platform differences, it shouldn't be
an issue either.

The other formats are likely much less tested than either vorbis or mp3,
in part because much of the code is closed, etc.  So I don't have any
idea about them.

jack.

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