cridecoder

A pure Rust library for CRI Middleware codec decoding. Supports ACB/AWB audio containers, HCA (High Compression Audio) decoding, and USM video container extraction.

Credits

This project's CRI format implementation is based on and inspired by vgmstream, a library for playing streamed audio from video games. Many thanks to the vgmstream contributors for their reverse-engineering work on CRI Middleware formats.

Features

• ACB/AWB Extraction — Parse CRI ACB audio containers and extract embedded/external audio tracks
• HCA Decoding — Decode HCA audio to PCM samples (f32 or i16) or WAV files
• USM Extraction — Extract MPEG2 video and ADX audio streams from USM video containers
• USM Metadata — Read and export USM metadata as structured JSON
• Key Testing — Test decryption keys for encrypted HCA files
• Pure Rust — No C dependencies, works on any platform Rust supports

Usage

Add to your Cargo.toml:

[dependencies]
cridecoder = "0.1"

ACB Extraction

use std::path::Path;
use cridecoder::extract_acb_from_file;

let tracks = extract_acb_from_file(
    Path::new("audio.acb"),
    Path::new("output/"),
).unwrap();

if let Some(tracks) = tracks {
    for track in &tracks {
        println!("Extracted: {}", track);
    }
}

HCA to WAV

use std::fs::File;
use cridecoder::HcaDecoder;

let mut decoder = HcaDecoder::from_file("audio.hca").unwrap();
let info = decoder.info();
println!("Sample rate: {}, Channels: {}", info.sampling_rate, info.channel_count);

let mut output = File::create("output.wav").unwrap();
decoder.decode_to_wav(&mut output).unwrap();

USM Extraction

use std::path::Path;
use cridecoder::extract_usm_file;

let files = extract_usm_file(
    Path::new("video.usm"),
    Path::new("output/"),
    None,   // optional video decryption key
    false,  // export audio
).unwrap();

for file in &files {
    println!("Extracted: {:?}", file);
}

Supported Formats

License

MIT