Enum Application 

pub enum Application {
    Voip = 2_048,
    Audio = 2_049,
    RestrictedLowDelay = 2_051,
}

What the encoder is being asked to optimise for, fixed when it is created.

This is the one setting that cannot be changed afterwards, because it decides which coding layers the encoder is allowed to use at all. It biases the SILK/CELT decision rather than dictating it: Audio and Voip both reach all three modes, and speech still codes as SILK under Audio when the content analysis says so.

The discriminants are libopus’s OPUS_APPLICATION_* values, so a caller bridging to a C API can cast between the two.

Variants

Voip = 2_048

Speech over a network. Shifts the mode threshold 8 kHz toward SILK (opus_encoder.c), so borderline content codes as speech, and enables the speech-oriented machinery: the analysis-driven bandwidth cap, DTX, and in-band FEC being worth spending bits on.

Audio = 2_049

General audio, and the right default when the content is unknown or mixed. Favours reproducing the input over making speech intelligible at low rates.

RestrictedLowDelay = 2_051

Lowest achievable latency, at a cost in quality.

Forces CELT for every frame and removes the 2.5 ms CELT lookahead that the other two spend to keep the layers aligned across a mode switch (opus_encoder.c:1904), since with no mode switching there is nothing to align. That lookahead is part of what OpusHead::RECOMMENDED_PRE_SKIP counts, so a stream encoded this way has less delay to skip.

Trait Implementations

impl Clone for Application

fn clone(&self) -> Application

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Application

impl Debug for Application

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

Formats the value using the given formatter.

impl Eq for Application

impl PartialEq for Application

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Application