Enum Codec 

pub enum Codec {
    Pcmu,
    Pcma,
    L16,
    Opus,
}

Which G.711 flavour a session carries.

Variants

Pcmu

µ-law, payload type 0.

Pcma

A-law, payload type 8.

L16

Signed 16-bit network-order linear PCM (RFC 3551 §4.5.11).

Static payload type 11 is mono at 44.1 kHz. Other negotiated rates use a dynamic payload assignment and override Config::clock_rate.

Opus

Opus (RFC 6716), on whatever dynamic payload type was negotiated.

Unlike the G.711 pair this carries state: an Opus encoder and decoder each hold a model of the signal they have seen, which is how the codec achieves what it does and why it cannot be a pure function of one frame. The state lives in the send and receive loops, one each, so nothing is shared and nothing is locked.

Implementations

impl Codec

pub fn payload_type(self) -> u8

The static payload type.

pub fn clock_rate(self) -> u32

The RTP clock rate, which is not always the sample rate.

RFC 7587 §7 fixes Opus’s RTP clock at 48000 whatever the audio is sampled at. A stack that used the sample rate instead produces timestamps the far end reads at the wrong speed.

pub fn from_payload_type(payload_type: u8) -> Option<Self>

The codec for a payload type, if it is one we carry.

Trait Implementations

impl Clone for Codec

fn clone(&self) -> Codec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Codec

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

Formats the value using the given formatter.

impl PartialEq for Codec

fn eq(&self, other: &Codec) -> 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 Codec

impl Eq for Codec

impl StructuralPartialEq for Codec