oxideav-musepack

Pure-Rust Musepack audio decoder — both the legacy SV7 (MP+) container and the modern SV8 (MPCK) chunked container. Zero C dependencies; clean-room from the public musepack.net SV7/SV8 specifications and an internal trace-based reverse-engineering writeup (under docs/audio/musepack/ of the workspace).

Part of the oxideav framework but usable standalone.

Status

Variant	Demuxer	Decoder	Notes
SV8	yes	yes	Mono / stereo, all four sample rates, all res paths
SV7	yes	partial	Demuxer reads the MP+ 16-byte fixed header + 20-bit per-frame length prefixes; decoder shares synthesis but the SV7 entropy path is still being wired in

SV8 is shipped first because the chunked container (SH / AP / SE

• explicit total_samples / block_power) is structurally simpler than SV7's running 20-bit-prefix bit cursor.

Installation

[dependencies]
oxideav-core = "0.1"
oxideav-musepack = "0.0"

Decoder

Accepts MPCK-prefixed Musepack SV8 streams (mono or stereo, sample rates {44 100, 48 000, 37 800, 32 000} Hz, all res ∈ [-1..17] quantiser branches). Output frames are interleaved SampleFormat::S16 at 1152 samples per channel per sub-frame; one AP packet expands to 1 << (2 * block_power) such sub-frames.

use oxideav_core::registry::CodecRegistry;
use oxideav_core::{CodecId, CodecParameters};

let mut codecs = CodecRegistry::new();
oxideav_musepack::register(&mut codecs);

let params = CodecParameters::audio(CodecId::new("musepack8"));
let mut dec = codecs.make_decoder(&params)?;
# Ok::<(), oxideav_core::Error>(())

Encoder

Not provided. Musepack's reference encoder (mpcenc) is the only production-grade encoder in existence and our workspace policy bans any third-party source (including a clean-room port). We focus on decode + container parse parity.

License

MIT — see LICENSE.