Lyra when originally announced by Google back in February sounded quite promising with their effort to allow for video chats over 56kbps Internet connections when Lyra is paired with the AV1 video codec. Getting decent voice quality at 3kbps was quite an engineering feat but made possible via their machine learning work.
It was unfortunate they hadn’t published the code back then but now this week it’s available in beta form.
The Lyra high-quality, low-bitrate speech codec is open-source with an initial v0.0.1 beta commit made today. Building Lyra requires the Bazel build system as well as a particular revision of LLVM/Clang for ABI compatibility. The Lyra code can be found on GitHub.