So, it looks like this tries to build a model (or rather, multiple layers of models combined with something called context mixing[0]), potentially analyzing the whole file first? Is it fair to call this a very fancy entropy coder, replacing the last phase of what a traditional audio codec does (the lossless part, after quantization)?
I like the code style, this is pretty nice C. It's refreshing to see human code.
If you have the complete file you can calculate the optimal ones. In a streaming scenario that does not work and you have use something you think is good.
From what I can see, it's more like a specialized ZIP-like compressor for Vorbis/Opus files. You archive them on blr, and decompress them back to the original format.
I just tested this out for myself and I was unable to play the .blr file in VLC or using ffplay. It is not recognized as anything by ffprobe either. So it seems like you need to decompress it to play it in a standard player unfortunately.
I like the code style, this is pretty nice C. It's refreshing to see human code.
[0]: https://en.wikipedia.org/wiki/Context_mixing
https://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-470003
If you have the complete file you can calculate the optimal ones. In a streaming scenario that does not work and you have use something you think is good.