CC Audio Expand

Computers in CC: Tweaked can play sound through a speaker peripheral, and CC Audio Expand changes how that playback is handled. It adds PCM playback in three sample formats: 16-bit signed little-endian, 8-bit unsigned and 8-bit signed. The mod is aimed at audio synchronization and playback smoothness problems that the vanilla speaker implementation of CC: Tweaked exhibits, and it references upstream CC: Tweaked issues it addresses.

Playback timing works from server-side timestamps. Each packet of audio is stamped with the time the server sent it, and when the client finds packets waiting in its queue for longer than 200 milliseconds it discards them. After lag, the server catches up with its playback progress rather than continuing to fall behind. The pump strategy wakes the audio engine earlier, and a keep-alive mechanism reduces pauses of about one second in audio reception. The mod needs CC: Tweaked, and it runs on client and server, so both the server and every player need it. Files are published for Forge and NeoForge, covering 1.20.1 and 1.21.1, and the code is released under the MIT License as open source.