Replace the single-owner PCM queues with one shared LGMP SPMC stream.
Give each admitted client reliable state and an independent playback
cursor, while clients without clock authority resample locally.
Extend the audio protocol with per-client epochs and barriers.
Keep capture exclusive and bound authority backpressure so slow
secondary readers cannot affect the disciplined low-latency path.
Give microphone data priority over replaceable clock feedback and
reduce feedback traffic on the shared client-to-host FIFO.
Retry short FIFO stalls outside the realtime thread and coalesce
consecutive packets in the existing fixed Windows buffers.
Avoid one broker write per tiny PipeWire quantum without adding
allocations or intentional capture latency.
Advertise signed and floating-point 32-bit formats across mono,
stereo, quad, surround, 5.1, and 7.1 at every supported rate.
Carry sample encoding through the broker and LGMP protocol so integer
and floating-point streams remain distinct.
Expand packet, shared-memory, and ring capacity for eight-channel
32-bit audio.
Treat the binding phase as the authoritative shutdown state after
graceful stream release.
Cover disconnect while the host drains and unbinds both streams.
Scope the legacy latency offset to classic SPICE and use the LGMP
poll bound as its fixed arrival reserve. Keep learned jitter additive.
Select provider clock feedback only when the current remote endpoint
advertises it, avoiding a failed startup attempt on broker v1.
Release LGMP stream slots before dispatching clipboard data so an X11
INCR consumer cannot prevent control queue acknowledgements.
Retain one bounded record in client memory while the sink is blocked.
Cancel abandoned X11 transfers after requestor destruction or a finite
progress timeout.
Add LGProtocol as a pinned submodule and consume its KVMFR protocol
definitions throughout the client, host, IDD, OBS, and profiler.
Keep Looking Glass framebuffer helpers local while removing duplicated
protocol headers and migrating users to KVMFR-scoped types.
Cache native keyboard lock state across input-provider transitions and
reconcile it with HID LED feedback over LGMP.
Project raw and corrective lock-key transitions through the reliable
input FIFO, defer correction until outstanding transitions settle, and
recover from delayed or missing feedback without double toggling.
Report guest HID keyboard LED state from LGInput to LGIdd and
publish it with the LGMP input endpoint status.
Forward SPICE modifier updates through the same provider state so evdev
can synchronize physical keyboard LEDs across transport changes and
reconnects.
Bump the versioned pipe and KVMFR input status contracts for the new
feedback state.
Accept earlier LGMP input status versions without LED feedback so the
client retains input while the guest driver is being upgraded.
Add a configured escape key plus Shift+R command that requests display
recovery from the LGMP transport and switches video to SPICE.
Track the request on the main thread, report its asynchronous result,
and return its producer instance with the request serial for exact
correlation.
Preserve normal escape+R rotation behavior, including custom Shift
escape keys.
Heartbeat expiry does not change the LGMP session ID. Queue operations
can therefore accept ownership releases into stale shared memory after
a guest reboot, where no host remains to advance the acknowledgement
serial.
Skip graceful clipboard and input ownership release when the session is
already invalid. Keep the existing timeout and warning for a live host
that fails to process the release.
Carry DATA and FILE_DATA only through the duplex SPSC streams. Keep LGMP
queues for control and status. Remove grants, commits, ACKs, and
queue-payload transport negotiation.
Poll adaptively while ownership or release is active. Preserve FIFO
release and graceful draining. Quarantine payloads crossed by a newer
OFFER or CLEAR, and retire data-plane state on detach.
Carry every input activation and report through its client-bound SPSC
stream. Keep the LGMP queue only for status publication and subscriber
discovery, removing transport selection and the queue-report fallback.
Retain graceful endpoint draining when a subscriber disappears and use
bounded adaptive polling while streams are active. The IDD polling setup
remains compatible with the project’s current C++ language mode.
Select the endpoint bound to this LGMP client and send each complete
input activation through its reliable fixed-slot stream.
Track the transport with every pending and published record so CLAIM,
reports, KEEPALIVE, RESET, and RELEASE cannot cross data planes.
Latch queue fallback for the connection after it is selected, avoiding
cross-generation reordering if a stream appears later. Preserve motion
coalescing and the existing queue retry behavior.
Attach the advertised clipboard lanes before claiming ownership, prefer
the stream transport, and activate only the acknowledged client and
epoch binding.
Move representation and file payloads through fixed-slot reservations
while status and lifecycle control remain on the LGMP queue. Retain a
legacy v4 fallback for other hosts.
Hold each host-to-client reservation until the consumer accepts its
record, return credits in order, and drain queued traffic in bounded
bursts before sleeping.
Mark the last non-empty FILE_DATA payload with BEGIN and END when the
producer knows it is terminal. Complete producer bookkeeping in the
following fileDataEnd call without consuming another LGMP grant. Keep
the standalone terminal record for empty and legacy unknown streams.
Drain up to 64 queued clipboard records per worker pass instead of
sleeping after every message. Poll at 1 ms while transfers, blocked
writes, held input, or pending output are active, and retain the 10 ms
interval while idle.
This removes a serialized grant round trip from every non-empty file
response and reduces scheduling delay while a large transfer is active.
Keep the 1 MiB payload size because the bottleneck was stop-and-wait
latency, not the chunk capacity.
Exercise a full 1 MiB response in a single BEGIN|END grant and retain
coverage for empty unknown-size responses.
Report expected and current protocol versions through the transport
interface and expose session-independent recovery operations.
Offer recovery from the version mismatch popup, publish requests through
the reserved IVSHMEM channel, and select the validated SPICE fallback.
Register SPICE connection and component options in the SPICE transport.
Move generic input and clipboard settings out of the SPICE namespace,
while retaining migration aliases for existing configurations.
Keep PureSpice and usbredir build requirements private to the transport,
and remove obsolete SPICE configuration state from the client core.
