Well, after some distraction as writing semi-working On2 AVC decoder (it turned out that On2 has introduced some special modes there that differ only on signal reconstruction stage, too lazy to RE them) and recovering after heat wave I’ve returned to the VoxWare ElenrilSound decoder.
I hate parametric codecs â€” no matter how you screw calculations you’ll still get some output but it won’t be useful for debugging. At least I can use MPlayer2 + binary codec loader + gdb combination to extract runtime information from the reference decoder.
Now I’m trying to make at least one mode work properly, 16kHz@16kbps mono (aka
VOXk) for now. Stereo reconstruction might be trickier so I’ll leave it for later but at least most modes differ only by the tables they use. So (in theory) I’ll need to make at least this mode work, add tables for other modes, fix stereo decoding, look at 8kHz@6kbps mode, curse and forget about it.
Good news â€” bit allocation works properly and bits are read exactly as in the reference decoder. Bad news â€” reconstructed output is not even close to the expected one, so the work continues…