Enum PcmEncoder 

pub(crate) enum PcmEncoder {
    Stereo(Encoder),
    Multi(MultiOpus),
}

One encode surface over both Opus APIs: the opus crate for mono/stereo, and the raw multistream C API for 6/8-channel surround.

Variants

Stereo(Encoder)

Multi(MultiOpus)

Implementations

impl PcmEncoder

pub(crate) fn new( sample_rate: u32, channels: i32, vbr: bool, bitrate: i32, ) -> Result<Self, String>

Build the Opus encoder for a channel count, selecting the API by width.

• Mono/stereo (channels <= 2): the safe opus crate encoder in LowDelay application mode; a failure to apply the initial bitrate or VBR mode is logged but not fatal.
• Surround (6/8): the raw multistream C encoder created from multiopus_layout in RESTRICTED_LOWDELAY; an unsupported channel count is a hard error.

Bitrate and VBR are applied at creation and can be retuned live via set_bitrate.

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

Encode one interleaved-PCM frame into out, returning the packet byte length.

Dispatches to the opus crate (mono/stereo) or the raw multistream encode (surround, which needs the explicit frame_size_per_channel). Either error surfaces as a String.

pub(crate) fn set_bitrate(&mut self, bits: i32) -> Result<(), String>

Retune the encoder’s target bitrate live (bits/s), for either API.