Audio-convert, audio-encode

[dy]

There is web-audio-recorder-js, lamejs, av, wave-recorder and probably other encoders. Same time we have audio-decode.

In the upcoming audio release there is going to be download or save method, returning OS-land audio file. The problem is that it seems there is not many MIME-types available for encoding audio in browser (see MediaRecorder.isTypeSupported), though we can safely provide ogg/wav not bloating the size of bundle (with audiobuffer-to-wav or alike).

For that purpose I'd suggest implementing audio-convert, (similar to color-convert), right after audio-encode. That way we can safely delegate re-coding to user and avoid too big size of audio package by forcing output encoding, say, ogg.

[dy]

Seems that we have no choice for browser but audiobuffer-to-wav, because MediaRecorder is realtime-bound renderer, I did not find a way to run it faster. Therefore we need standalone audio-encode to be able to convert between AudioBuffer and variety of output formats.