Opus codec

[dholth]

This is a rough start on an Opus audio codec extension for circuitpython, which is an excellent audio codec. It expects https://github.com/dholth/arduino-libopus to be checked out next to the circuitpython checkout. Not sure it has a place in circuitpython in this state, but it might be interesting to someone. This began as a micropython extension, but crashed on-device when instantiating oggz.oggz(f), and I haven't investigated that with a JTAG probe.

Usage

import oggz
nyan = open('nyancat.opus', 'rb')
opus = oggz.oggz(nyan0
buffer = bytearray(960*4)
content_type, samples, bytes_read, buffer_length = opus.decode_opus(buffer)