[FFmpeg-devel] [PATCH] g722: Add a trellis encoder

Martin Storsjö martin
Wed Dec 1 13:03:17 CET 2010

On Wed, 1 Dec 2010, Martin Storsj? wrote:

> Now that most (all?) issues with the normal adpcm trellis encoder have 
> been sorted out, here's an updated version of the g722 trellis encoder, 
> with all the changes from the adpcm trellis encoder incorporated.

As Tomas H?rdin suggested on irc, the lower and upper subbands could be 
optimized totally independently from each other with a separate trellis. I 
implemented this, making it run faster and giving better output. 
(Previously, I ran one trellis, where each combination of lower and upper 
subband codewords were tested as a whole, but still by summing their ssds. 
Since they don't affect each other, they can be optimized separately.)

Thus, updated patch attached.

// Martin
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