MOQ Wiki

Google QUICHE MoQT (quiche-moq)

Updated

Language: C++ Organization: Google Primary developers: martin-duke, Victor Vasiliev, with contributions from asedeno, dschinazi GitHub: google/quiche (MoQT module within Google’s QUICHE library)

Overview

A substantial C++ MoQT implementation inside Google’s QUICHE library (part of Chromium). Includes ~74+ source files plus a tools directory with relay, server, client, chat, and simulator applications. This is one of the more actively developed implementations in the ecosystem, with commits continuing into mid-2026.

Draft Support

  • draft-16 — current target for the public relay
  • Passed 41/41 conformance tests from alan-frindell (Feb 2026)
  • Protocol work lands on main ahead of the relay: newer draft-tracking refactors merge in the module while the public relay’s registered interop target still lags at draft-16.
  • draft-18 migration underway on main (July 2026) — the module is being reshaped toward the draft-18 wire: SUBSCRIBE moved onto a dedicated bidirectional stream, the SUBSCRIBE_NAMESPACE/SUBSCRIBE_TRACKS split, and a codebase-wide class rename (see Recent Highlights). This is Google converging on the interop-runner’s draft-18 target from a very different C++ base than moqtail/moxygen.

Public Infrastructure

Recent Highlights

Day-by-day PR/issue history lives in the wiki log; this section keeps only durable milestones.

  • draft-18 conformance sprint (Sep 22–29, 2026) — eleven commits, the module’s most focused draft-18 pass to date and the heaviest activity of any tracked repo in the window relative to its size. Landed: draft-18 PADDING streams and datagrams implemented; Stream Error codes updated to draft-18; draft-18 namespace restrictions enforced; SetupParameters renamed to SetupOptions (tracking the draft-18 vocabulary); a session error when a request ID is reused in a SUBSCRIBE or has the wrong parity; unknown unidirectional stream types now a protocol error; and handling for unknown Mandatory-To-Implement Track Properties. Two msan/uninitialised-value fixes in MoqtParserTest and MoqtSessionTest closed the sprint. Net effect: the C++ module now covers the draft-18 data-plane and setup surface that the interop harness exercises — though it still scores zero passing cells in the nightly interop-runner, so this is code-level conformance not yet reflected in the matrix. Sep-29: Duke’s 54534998b2 “Update GOAWAY format to MOQT draft-18” (+173/−37). It is parser/framer only; handling of the new fields comes in a follow-up CL.
  • draft-18 update sprint + NEW_GROUP_REQUEST support (Sep 16–18, 2026) — after a ~12-day quiet stretch (first commit since Sep-4), the module ran a burst of draft-18 work. It moved FETCH off the control stream onto its own bidirectional stream (commit bc4e3dd9, Sep-16 22:08 UTC — the same treatment SUBSCRIBE, TRACK_STATUS and PUBLISH_NAMESPACE already got, and removing request_id from FETCH_OK / REQUEST_ERROR to match the wire), then Sep-17 updated SUBSCRIBE_OK and REQUEST_OK to draft-18 (81f59114) and — the new capability — added NEW_GROUP_REQUEST support in two parts (7f1f920d “part 1” + cffebe23 wiring it into MoqtRelayTrackPublisher), plus a cache-non-empty guard when pulling from the outgoing queue (8734d018) and two OSS-build fixes (95b12df5, ae779d8d). Sep-18 continued it: a third NEW_GROUP_REQUEST commit allowing it on subscription update, including PUBLISH_OK (f44c3550c), and a TrackExtensions → TrackProperties rename to conform to draft-18 terminology (213deeca6). NEW_GROUP_REQUEST is the dynamic-groups mechanism the WG is actively refining (moq-transport #1947/#1948), and the rename tracks the extensions→track-properties reshape behind #1950; quiche is now implementing both (all marked “Not in production”).
  • Control channel → a pair of unidirectional streams (Aug 27, 2026) — Victor Vasiliev’s commit e88d141 “Use a pair of unidirectional streams for control messages” (23:38 UTC) reworks the control channel itself — a step beyond the July–Aug work that had peeled individual control messages (SUBSCRIBE, TRACK_STATUS, PUBLISH_NAMESPACE) onto dedicated bidirectional streams. The draft-18 wire-migration continues from quiche’s distinct C++ base.
  • Wire-migration resumed (Aug 11–12, 2026) — after being quiet in the module since Aug-4, four commits continue peeling control messages onto dedicated bidirectional streams: TRACK_STATUS moved to a separate stream (c57a70d2, Aug-11), a MoqtResponseCallback invocation-consistency fix (8a147ac8), PUBLISH_NAMESPACE moved onto a bidi stream (4b2d81f4, Aug-12), and an OSS-build fix (d01a24d4). Extends the July-17 SUBSCRIBE-to-bidi pattern; the PUBLISH_NAMESPACE move coincided (on the stream-carriage axis) with moq-dev’s Aug-12 unsolicited-announce work (#2748) and moq-transport issue #1854.
  • draft-18 migration burst (July 17, 2026) — after being quiet in the module since July 8, three substantial commits move the impl toward draft-18: SUBSCRIBE moved to a dedicated bidirectional stream (78341592; new MoqtSubscribeRequestStream/ResponseStream, SUBSCRIBE/SUBSCRIBE_OK/UNSUBSCRIBE removed from the control stream, MoqtUnsubscribe message type dropped, session no longer owns subscriptions), a codebase-wide class rename (2f4ea0dd; SubscriptionPublisher→LivePublisher, SubscribeRemoteTrack→LiveSubscriber, RemoteTrack→ObjectSubscriber), and the SUBSCRIBE_NAMESPACE / SUBSCRIBE_TRACKS split (d106f181). Makes quiche a fifth codebase converging on the runner’s draft-18 target.
  • PUBLISH moved to a bidirectional stream (June 2026) — aligns Google’s C++ impl with the draft direction of carrying PUBLISH on a bidi stream.
  • Control-stream architecture refactor (June 2026) — control-message handlers were folded into the session and the control stream split in two; a dedicated WebTransport-only client class was split out of MoqtClient.
  • Session parameter control API (April 2026) — MoqtClient and MoqtServer can control session parameters, groundwork for partial-object delivery on the relay.
  • Removed moqt::SubscribeWindow (April 2026) — dropped legacy SUBSCRIBE window tracking as draft-17’s PUBLISH/SUBSCRIBE model settled.
  • Joining FETCH work (April 2026) — Joining FETCH limited to largest_object at time of SUBSCRIBE, with responsibility moved from MoqtOutgoingQueue to the session layer, preparing for REWIND’s joining FETCH aspects.

Interop

Disambiguation

There is also a separate Rust project called birneee/quiche_moq by Leon Birne, built on Cloudflare’s quiche crate (a Rust QUIC library). Created 2025-10-17. That project supports drafts 07-13 and 16 but is not in the interop runner. The naming collision is coincidental — both are named after QUIC libraries that happen to share the name “quiche.”

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