Crate blazen_audio_codec 

blazen-audio-codec

Neural-audio-codec backends for Blazen. Codecs translate raw PCM into discrete codebook tokens (and back) so generative models can operate in a low-rate, GPU-friendly token space instead of 24-48 kHz waveform samples.

This crate plays the same role for codecs that blazen-audio-tts plays for TTS and blazen-audio-music plays for music: a single capability-typed CodecBackend trait plus a monomorphizable CodecBackendHandle<B> and an erased DynCodecProvider for binding layers.

Backends

Backend	Feature flag	Status
[backends::encodec]	encodec	Functional — Meta’s EnCodec 24 kHz / 4-codebook neural codec via candle-transformers.
backends::dac	dac	Functional decode — Descript Audio Codec (descript/dac_44khz, 9 codebooks at 8 kbps) via candle-transformers. Encode short-circuits until candle exposes a public RVQ encode path.
backends::snac	snac	Functional — Multi-Scale Neural Audio Codec (hubertsiuzdak/snac_24khz, 3 multi-scale codebooks @ vq_strides [4, 2, 1], 24 kHz, ~3 kbps) via candle-transformers. Both encode and decode are wired.

Why a dedicated codec trait?

Codecs are pure functions over PCM and tokens — no prompts, no sampling temperature, no voices. Trying to thread them through the generative AudioBackend surface would force every codec to invent prompt semantics it doesn’t have, so the CodecBackend trait adds only encode_pcm / decode_tokens and inherits the lifecycle methods (load / unload / is_loaded) from [AudioBackend].

See PR_AUDIO_PLAN.md §3 + §5 W5 for the full restructure rationale.

Re-exports

pub use error::CodecError;

pub use provider::CodecBackendHandle;

pub use provider::DynCodecProvider;

pub use traits::CodecBackend;

Modules

backends

Concrete codec backend implementations.

error

Capability-specific error type for codec backends.

provider

Provider wrappers exposing crate::CodecBackend to in-process callers and to the binding / bridge layer.

traits

The CodecBackend trait every neural audio codec implements.