Enum Rate 

#[non_exhaustive]
pub enum Rate {
    Imbe7200x4400,
    Imbe4400x4400,
    AmbePlus2_3600x2450,
    AmbePlus2_2450x2450,
}

Vocoder rate selection — picks both the codec generation and the wire-FEC framing.

More variants will land as additional carriers are added. The values themselves are also stable Wire-format choices: a Rate is enough to know how many FEC bytes a frame is, what codec generation drives the synth, and which dequantize tables to use.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Imbe7200x4400

P25 Phase 1 FDMA full-rate IMBE. 18-byte FEC frame (72 dibits). 7 200 bps total / 4 400 bps voice + 2 800 bps FEC.

Imbe4400x4400

IMBE info-only — same codec as Self::Imbe7200x4400 with the Annex H Golay/Hamming/PN FEC layer stripped. 11-byte wire frame (88 prioritized info bits packed MSB-first). 4 400 bps total (= voice). Byte layout matches JMBE / OP25 / DVSI p25_nofec convention bit-for-bit (validated against DVSI tv-rc references at 100% bit-exact). Use this for storage when you specifically need an info-only IMBE archive; otherwise prefer the FEC-bearing Self::Imbe7200x4400 format — see docs/wire_formats_and_storage.md.

AmbePlus2_3600x2450

P25 Phase 2 TDMA half-rate AMBE+2. 9-byte FEC frame (36 dibits). 3 600 bps total / 2 450 bps voice + 1 150 bps FEC. Also the vocoder-layer format for DMR Tier II/III voice frames (modulo carrier-specific burst framing).

AmbePlus2_2450x2450

AMBE+2 half-rate info-only — same 49 info bits as Self::AmbePlus2_3600x2450 with the Golay/Hamming/PN FEC layer stripped. 7-byte wire frame (49 info bits packed MSB-first in u₀..u₃ order, 7 trailing pad bits). 2 450 bps total (= voice).

Byte layout caveat. DVSI’s chip rate-index 34 emits the same 49 info bits in a different (chip-internal, permuted) byte order. This crate’s layout is self-consistent (ours-to- ours round-trip is lossless) but is not byte-equal to DVSI’s r34 stream. If you need byte-exact DVSI r34 interop, see the future blip25-chip-shim crate; here this variant is for compact ours-to-ours archival. Recommended storage format is the FEC-bearing Self::AmbePlus2_3600x2450 — see docs/wire_formats_and_storage.md.

Implementations

impl Rate

pub const fn fec_frame_bytes(self) -> usize

Number of bytes in one wire frame at this rate. Includes FEC for the FEC-bearing variants (Self::Imbe7200x4400, Self::AmbePlus2_3600x2450) and is just the packed info bits for the no-FEC variants (Self::Imbe4400x4400, Self::AmbePlus2_2450x2450).

pub const fn frame_samples(self) -> usize

PCM samples per frame (always 160 at 8 kHz / 20 ms; provided for symmetry with Self::fec_frame_bytes).

Trait Implementations

impl Clone for Rate

fn clone(&self) -> Rate

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Rate

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for Rate

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Rate

fn eq(&self, other: &Rate) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Rate

impl Eq for Rate

impl StructuralPartialEq for Rate