[FFmpeg-devel] AMR-NB decoder

[Colin McQuillan]

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.
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