[vorbis] Vorbis ACM codec

[Reuben Martin]

 I believe that, unlike Direct Show, ACM was designed to be used with CBR
compression formats only. Although it is possible to get VBR to work in ACM,
it causes problems when it's multiplexed into an AVI file because the
multiplexer expects to interleave the data chunks at a constant chunk size
the whole way through. That's why people have a hard time synching up audio
when using an ACM MP3 codec in VBR mode. It can be done, but it's tricky. I
would wait till Ogg supports CBR before using it for anything more than
testing in AVI files.

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