A very trivial example of an Opus decoder using the Opusfile library. I used to
this to help me implement Opus in to the ctrmus program.

gcc -O3 -Wall -I/usr/include/opus trivial_opusdec.c -lopusfile -o trivial_opusdec

Example (use SoX):

./trivial_opusdec test.opus | play -t raw -r 48k -e signed -b 16 -c 2 -