#[cfg(target_os = "macos")]mod native;use std::fmt;use std::sync::Arc;use std::sync::atomic::AtomicU16;use std::sync::mpsc;#[derive(Debug, thiserror::Error)]pub enum RealtimeWebrtcError {    #[error("{0}")]    Message(String),    #[error("realtime WebRTC is not supported on this platform")]    UnsupportedPlatform,}#[derive(Debug, Clone, PartialEq, Eq)]pub enum RealtimeWebrtcEvent {    Connected,    LocalAudioLevel(u16),    Closed,    Failed(String),}pub type Result<T> = std::result::Result<T, RealtimeWebrtcError>;pub struct StartedRealtimeWebrtcSession {    pub offer_sdp: String,    pub handle: RealtimeWebrtcSessionHandle,    pub events: mpsc::Receiver<RealtimeWebrtcEvent>,}pub struct RealtimeWebrtcSessionHandle {    #[cfg(target_os = "macos")]    inner: native::SessionHandle,    local_audio_peak: Arc<AtomicU16>,}impl fmt::Debug for RealtimeWebrtcSessionHandle {    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {        f.debug_struct("RealtimeWebrtcSessionHandle")            .finish_non_exhaustive()    }}impl RealtimeWebrtcSessionHandle {    pub fn apply_answer_sdp(&self, answer_sdp: String) -> Result<()> {        #[cfg(target_os = "macos")]        {            self.inner.apply_answer_sdp(answer_sdp)        }        #[cfg(not(target_os = "macos"))]        {            let _ = answer_sdp;            Err(RealtimeWebrtcError::UnsupportedPlatform)        }    }    pub fn close(&self) {        #[cfg(target_os = "macos")]        self.inner.close();    }    pub fn local_audio_peak(&self) -> Arc<AtomicU16> {        self.local_audio_peak.clone()    }}pub struct RealtimeWebrtcSession;impl RealtimeWebrtcSession {    pub fn start() -> Result<StartedRealtimeWebrtcSession> {        #[cfg(target_os = "macos")]        {            let started = native::start()?;            Ok(StartedRealtimeWebrtcSession {                offer_sdp: started.offer_sdp,                handle: RealtimeWebrtcSessionHandle {                    inner: started.handle,                    local_audio_peak: Arc::new(AtomicU16::new(0)),                },                events: started.events,            })        }        #[cfg(not(target_os = "macos"))]        {            Err(RealtimeWebrtcError::UnsupportedPlatform)        }    }}