This functions almost identically to DecodeInterleavedWithPerfOld,
however this function also has the ability to reset the decoder context.

This is documented as a potentially desirable thing in the libopus
manual in some circumstances as it says for the OPUS_RESET_STATE ctl:

"This should be called when switching streams in order to prevent the
back to back decoding from giving different result from one at a time
decoding."