[FFmpeg-devel] [PATCH] Simplify IMDCT in dca.c

[Benjamin Larsson]

Michael Niedermayer wrote:
> Hi
> 
> patch below replaces the duplicated IMDCT in dca.c by the standard one.
> code is faster, simpler nicer, ....
> yes the QMF of dca is a windowed IMDCT

One part of the IMDCT is a timedomain overlap by the synthesis window. I
couldn't find one in the patch thus I currently don't agree with the
IMDCT claim. I'm not really sure but I think ff_imdct_half is more like
a DCT-IV. That being said patch ok (with the alignment fixes). And
thanks for optimizing the code.

MvH
Benjamin Larsson