Enum Encoder 

pub enum Encoder {
    G711(G711Codec),
    Opus(OpusEncoder),
}

The encode half of a negotiated call codec.

G.711 is a stateless table lookup (the enum just carries the μ-law/A-law choice); Opus owns a heap-backed encoder with inter-frame state. Either way: feed one 20 ms frame at pcm_sample_rate per call, in order.

Variants

G711(G711Codec)

PCMU or PCMA.

Opus(OpusEncoder)

Opus, wideband voice profile.

Implementations

impl Encoder

pub fn pcm_sample_rate(&self) -> u32

The PCM rate this encoder consumes: 8 kHz for G.711, 16 kHz for Opus. Resample the microphone to this, not to a global constant.

pub fn frame_samples(&self) -> usize

Samples in one 20 ms frame at pcm_sample_rate: 160 for G.711, 320 for Opus.

pub fn encode( &mut self, pcm: &[i16], out: &mut Vec<u8>, ) -> Result<usize, CoreError>

Encode one 20 ms frame, appending the payload bytes to out and returning the payload length. G.711 cannot fail; Opus errors surface (wrong frame length, libopus failure).