1. Opus audio format

    Royalty-free open audio codec by IETF, which incorporated SILK from Skype and CELT from Xiph.org, to serve higher sound quality and lower latency at the same bitrate.

  2. audioencoder api: configure: opus

  3. audioencoder api: configure: opus: `opus.application`

  4. audioencoder api: configure: opus: `opus.signal`