SwiftOpus

SwiftOpus is a Swift package maintained by Skyline-23 for low-latency Opus decode paths on Apple platforms.

Version

• Current package stream: 0.1.0

What is implemented

• Vendored upstream libopus via submodule pinned to v1.6.1
• Typed runtime surface (OpusSampleRate, OpusChannelLayout, OpusDecoderConfiguration, OpusError)
• Hardware-friendly low-copy decode path:
  • single-stream decode (opus_decode / opus_decode_float)
  • multistream decode (opus_multistream_decode / opus_multistream_decode_float)
• Output conversion helpers for non-interleaved AVAudioPCMBuffer
• Swift Testing coverage for config/layout/decode guardrails

Quick usage

import SwiftOpus

let config = try OpusDecoderConfiguration(
    sampleRate: .hz48k,
    channels: 2,
    pcmFormat: .float32
)
let decoder = try OpusDecoder(configuration: config)

if let pcm = try decoder.decodeToPCMBuffer(payload: packetData) {
    // enqueue into audio output path
}

Notes

• Decoder APIs are built for realtime paths and avoid per-call decoder reallocation.
• Multistream layout for 5.1/7.1 follows standard Opus mapping.