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If I'm right you need some synchronization/locking to make visible every data change properly for every thread since two threads use the ring buffer at the same time: AppAudioStream_BufRecv and AppAudioStream_DecoderCb.

Two posts from SO which look useful:

• Mutex example / tutorial?
• Is changing a pointer considered an atomic action in C?

If I'm right you need some synchronization/locking to make visible every data change properly for every thread since two threads use the ring buffer at the same time: AppAudioStream_BufRecv and AppAudioStream_DecoderCb.

Two posts from SO which look useful:

• Mutex example / tutorial?
• Is changing a pointer considered an atomic action in C?