Skip to main content

Opus

The OpusEncoder handles high-quality, low-latency VoIP audio encoding for the HoloMIT SDK.

Implementation Details​

The encoder inherits from VoiceEncoder (and ultimately BaseWorker) and operates asynchronously using thread-safe queues. It pulls raw audio frames (FloatMemoryChunk) from an input queue, compresses them, and pushes the resulting ByteMemoryChunk to an output queue.

  • Implementation: Wraps the UnityOpus library.
  • Configuration:
    • Sampling Frequency: 16000 Hz
    • Channels: Mono
    • Application: VoIP
    • Bitrate: 96000 bps
    • Complexity: 10
    • Signal Type: Voice
  • Buffer Size: Fixed at 320 samples per frame.

Decoder (VoiceDecoder)​

Instead of having a separate decoder class, the system uses a unified VoiceDecoder that handles Opus dynamically.

  • When instantiated, it prepares a UnityOpus.Decoder (16000Hz, Mono).
  • It reads the format from the first packet's metadata (_chunk.Info.Dsi).
  • Because the incoming stream is Mono but Unity's spatial audio or multi-channel setups might require more, the decoder duplicates the decoded mono signal across 6 channels into the final FloatMemoryChunk before queueing it for the AudioPreparer.

Found something wrong or missing?

🐞 Report issue✏️ Missing information❌ Incorrect information🤔 Confusing information💡 Something else