[Vorbis] Frame in Mpeg and Window in Vorbis

[Ralph Giles]

On Mon, Aug 29, 2005 at 12:44:35PM -0000, Ravi  Lakkundi wrote:

> MPEG L3 has a fixed frame size of 1152 samples which are fed to the encoder and vorbis has a variable winow size ?????? is this correct ?

Yes. Each stream has two sizes ('blocks' in vorbis terminology). Each is
a power of two, and the actual two sizes used are defined in the header.

> Frame in MPEG is window in Vorbis ?? 

I'm not an MP3 expert, but I understand that is the correct 
correspondence.

I also understand AAC has long and short blocks/frames/windows,
but it always uses runs of short blocks to exactly match the
length of a long block, so one maintains something very similar
to a fixed frame size.

 -r