[FFmpeg-devel] AMR-NB decoder

Colin McQuillan m.niloc
Thu Aug 13 10:38:39 CEST 2009

2009/8/10 Colin McQuillan <m.niloc at googlemail.com>:
> 2009/8/6 Michael Niedermayer <michaelni at gmx.at>:
>> On Wed, Aug 05, 2009 at 05:51:36PM +0100, Colin McQuillan wrote:
>>> Attached is a patch for an AMR-NB decoder.
>>> It is not bit-exact. This makes it tricky to verify, but I have been
>>> checking that internal parameters match the 3GPP decoder for the AMR
>>> test sequences. The PSNR between the input and output is 3.90 to 8.42
>>> which is about the same as the reference decoder. The PSNR between the
>>> two outputs is between 8.50 and 18.16, which seems quite good.


> I have tried to address every other comment made in the thread. The
> main changes are cosmetics, using fixed point tables to save space,
> and keeping the algebraic codebook vector sparse until
> anti_sparseness.
> amrnb-decoder-r2.patch uses high-pass-filterf.patch, agc-3.patch, and
> circ-addf.patch.

Any comments on that patch? It needs to be updated but I don't want to
send out 200KB patches every time I change a function name.

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