Thanks for the link Tomas.
The codec is slow without a GPU (about realtime on a Zen2 desktop for
me), but performs remarkably well at very low bit rates.
I encoded/decoded the 've9qrp_10s.raw' example file from the Codec2/raw
directory at different quality-levels, from 1 to 7, which correspond to
compression levels of 58bps (!) up to just under 700bps, for interest,
and uploaded to:
https://github.com/brian-smith-github/tsac_low_bitrate_examples
Even at 200bps the speech is understandable, quite remarkable I think.
The codec source is not available but Fabrice mentions on the site that
it is based on the 'Descript' codec, which _is_ open source, and which
in turn seems to be based on 'EnCodec', which is also (python)
open-source and uses the 'PyTorch' and 'PyTorchAudio' libraries to do
the fft/mel/MFCC stuff involved I think.
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