[TwoLAME-discuss] Joint stereo encodings, can someone explain...?

[Elio B. <ebl...@us...>]

I see when lame does joint stereo encodings, it sets all frames using jointstereo value (0x1) in the 
`channels' field into the mpeg header. After that, some frames get encoded as simple stereo, others 
as ms stereo, others as intensity stereo and such.
Now, what happens with layer II? I see when twolame is asked to encode joint stereo audio, it 
switches between stereo and jointstereo frames, changing the `channels' field into the mpeg header.
So, how does this work? Is it different from layer III?
On the other hand, I didn't find other layer II encoders doing jointstereo encoding (it seems only 
twolame supports this), so I cannot make any assumption.
Elio