Enum FecDecodeStatus 

pub enum FecDecodeStatus {
    Recovered,
    NoLbrr,
    NotSilk,
    DecodeError,
}

Why an in-band FEC (OpusDecoder::decode_packet_fec) recovery produced the samples it did (RFC 6716 §2.1.7 / §4.2.5).

In-band FEC works by re-encoding the signal of the frame prior to a packet at a lower bitrate and carrying it as one or more §4.2.5 LBRR frames inside that packet. When a packet is lost, the decoder can recover the lost frame’s audio from the LBRR frame(s) in the next successfully received packet (decode_packet_fec), rather than emitting pure silence / running pitch-based concealment.

Variants

Recovered

The packet carried §4.2.5 LBRR frame(s) for the lost prior frame, and they were decoded in Table-5 order and synthesized through the §4.2.7.9 LTP / LPC filters into real recovered audio at 48 kHz. For a stereo packet the recovered mid/side LBRR frames were unmixed via §4.2.8.

NoLbrr

The packet has no LBRR frame for the requested channel(s) (the §4.2.4 LBRR flags are clear), so no FEC data is available. Silence of the requested duration was emitted; the caller should fall back to its own packet-loss concealment.

NotSilk

The packet is not a SILK-bearing mode (CELT-only carries no LBRR), so FEC recovery is not possible. Silence was emitted.

DecodeError

The packet’s §4.2 LBRR bitstream was malformed / truncated. Silence of the requested duration was emitted in its place.

Trait Implementations

impl Clone for FecDecodeStatus

fn clone(&self) -> FecDecodeStatus

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FecDecodeStatus

impl Debug for FecDecodeStatus

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

Formats the value using the given formatter.

impl Eq for FecDecodeStatus

impl PartialEq for FecDecodeStatus

fn eq(&self, other: &FecDecodeStatus) -> 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 StructuralPartialEq for FecDecodeStatus