[vorbis-dev] Error after half-blocksize

[Christian Wassmer]

Hi

I've got serious problem with my Vorbis-Decoder. The error seems to 
happen in the inverse Mdct. Before the imdct the values seems to be 
correct (compared with those of jOrbis (www.jcraft.com/jorbis/)). But 
after the transformation the values shows a strange behaviour. In [0, 
blocksize/2] the values are correct, but in [blocksize/2, blocksize] the 
values are wrong.

The difference in this interval between the values of jOrbis and mine is 
like a sinus-wave, but not a very clear one. [It's hard to describe it 
as long you have no picture. I don't if it's appropriate to attach 
images to such mailing-list-mails, but if needed I'll send one ...] 
Perhabs the following "dot-picture" will help a little bit ... Up to 
blocksize/2 the values are ok, but afterwards there is high "sinus-peak" 
followed by two lower negative peaks and another high-peak.

<p>          .       .
         . .     . .
         . .     . .
........   . . .   .
             . .

<p>Hope somebody can help. It seems strange to me that the values in the 
first half are ok while in the second they are not ...

Regards,
Christian Wassmer

<p><p><p>--- >8 ----
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