Struct PbShared 

pub(crate) struct PbShared {
    pub(crate) inner: Arc<Inner>,
    pub(crate) thread: Mutex<Option<JoinHandle<()>>>,
    pub(crate) queue: Arc<PlayQueue>,
    pub(crate) opus_dec: Mutex<Option<OpusPlaybackDecoder>>,
}

Per-AudioPlayback shared handle — the mirror of Shared for the playback path.

Reuses the capture lifecycle core on Inner (the stop_state protocol, the start handshake, and the worker-tid re-entrancy guard); the Opus/silence settings mirrors on Inner are unused here. Adds the bounded PCM queue and the always-Opus mic decoder.

Fields

inner: Arc<Inner>

thread: Mutex<Option<JoinHandle<()>>>

queue: Arc<PlayQueue>

opus_dec: Mutex<Option<OpusPlaybackDecoder>>

The mic uplink is always Opus; write / write_red decode each packet through this before enqueuing PCM. Set at start(); None only before a successful start.