[FFmpeg-cvslog] r12397 - trunk/libavcodec/ac3dec.c

[Rich Felker]

On Sun, Mar 09, 2008 at 06:05:19PM +0100, jbr wrote:
> Author: jbr
> Date: Sun Mar  9 18:05:19 2008
> New Revision: 12397
> 
> Log:
> downmix before imdct unless different size transforms are used. about 20%
> faster 5.1-to-stereo downmixing.

I don't understand what this 20% is measuring? Time spent in
downmixing? That should be the same either way. The performance
difference should mainly be in the number of IMDCTs (6 vs 2) and I
suspect it makes a 50% or more difference to overall decoding time.

Rich