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feat(mux): follow referenced broadcasts' announcements - #6254
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Add moq_mux::Follow (Source::follow, Follow::new), built on announced_broadcast: each instance serving a sibling is handed out as it starts or takes over, and its end is reported. A reference naming an epoch follows only its own instance (best effort over epochless routes). moqsrc pumps follow their sibling: the first start binds the rendition, an end idles its pad, and another instance restarts the stream on the same pad. Exporters bind a sibling once it is first announced instead of failing, and end the rendition when that instance goes. @moq/watch drops a rendition whose broadcast proves another epoch from its effective catalog. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Delete the quest, point sink-restart-follow at moq_mux::Follow, and size the now-childless broadcast epoch epic. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Public Source::bind, resolve, and subscribe_track keep answering for the routes as they stand: HLS answers per request and moq play picks renditions inline, so neither can wait on a sibling that left. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…och/reference-announcements # Conflicts: # quest/m0/broadcast-epoch/reference-announcements.md # quest/m1/reference-epoch-bindings.md # quest/m1/sink-restart-follow.md
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Quest outcome: the reference-announcements behavior is implemented and tested (moq-mux, moq-hls, moq-rtc, moq-gst source, Sink restart follow should build on (Written by Claude Opus 5.5) |
…ollow::*
Source::bind, resolve, and subscribe_track wait for a sibling nothing
announces yet, through routed_broadcast, instead of failing Unroutable.
A binding answers its pinned instance once the path is pinned, so a
sibling that announced and then left answers its ended broadcast rather
than waiting for the next. moq-hls drops its own re-issue loop, and its
disconnected-sibling test now names the sibling it means to bind.
Move Follow/Followed to moq_mux::follow::{Instances, Event}.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughRust source bindings now wait for and pin the first announced sibling broadcast. The new follow API reports instance starts and ends, with optional epoch filtering. Export sources end renditions when their pinned sibling instance closes. JavaScript catalog filtering excludes renditions when the active broadcast proves a different epoch. Migration notes, API checksum references, and related documentation were updated across language bindings. Priority: ➖ Normal Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly and concisely describes the main change: following announcements for referenced broadcasts. |
| Docstring Coverage | |
Docstring coverage is 86.11% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 72 functions across 11 files. (21 skipped: … |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
| Description check | |
The pull request description directly matches the changeset. It explains sibling-broadcast following, waiting behavior, API additions, exporter and consumer updates, documentation changes, tests, and … |
Full details: Docstring Coverage
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Docstring coverage is 86.11% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 72 functions across 11 files. (21 skipped: 21 unsupported.)
Full details: Description check
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Explanation
The pull request description directly matches the changeset. It explains sibling-broadcast following, waiting behavior, API additions, exporter and consumer updates, documentation changes, tests, and known test limitations.
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…ed self-follow moqsrc renditions restarting on the same sibling instance now share that instance's timeline, so audio and video fix one segment mapping instead of each starting from its own first frame. Source::follow fails a self-reference whose epoch the catalog instance contradicts with EpochMismatch, rather than parking forever on a fixed feed no other instance can join. Binding and follow share one epoch check. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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… idles Every moqsrc rendition picks its sibling instance's timeline when it starts reading it, not only once it owns a pad, so one still subscribing when a replacement takes over shares the replacement's mapping. The first instance at a path keeps the run's timeline. A sibling track finishing while its instance stays up idles the pad and keeps following, so the instance that replaces it starts a new stream there; the finish record clears once a new instance starts on the pad. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Review comments at @rs/moq-gst/src/source/imp.rs:
- Around line 1415-1418: Update the finished-track bookkeeping used by reconcile
and the Claim::Kept branch so it is scoped to the specific broadcast instance
that finished, not just its path; allow a later sibling instance at the same
path to start playback while still blocking replay of the original instance. Add
a regression test that finishes a sibling track, toggles the rendition’s enabled
state, publishes a new sibling instance, and verifies its frames reach the pad.
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cpp/moq/MIGRATE.mddart/moq/MIGRATE.mddart/moq_ffi/MIGRATE.mddart/moq_ffi/lib/src/moq.dartdoc/bin/gstreamer.mddoc/concept/hang.mdgo/ffi/MIGRATE.mdgo/wrapper/MIGRATE.mdjs/watch/src/broadcast.test.tsjs/watch/src/broadcast.tskt/moq-ffi/MIGRATE.mdkt/moq/MIGRATE.mdpy/moq-ffi/MIGRATE.mdpy/moq-rs/MIGRATE.mdquest/m0/broadcast-epoch/README.mdquest/m0/broadcast-epoch/reference-announcements.mdquest/m1/announce-takeover.mdquest/m1/identity-guide.mdquest/m1/reference-epoch-bindings.mdquest/m1/sink-restart-follow.mdquest/m2/contribution-ref.mdrs/moq-c/MIGRATE.mdrs/moq-ffi/MIGRATE.mdrs/moq-ffi/src/consumer.rsrs/moq-gst/src/source/imp.rsrs/moq-hls/src/export/mod.rsrs/moq-hls/src/export/rendition.rsrs/moq-hls/src/server/routes.rsrs/moq-mux/MIGRATE.mdrs/moq-mux/src/container/source.rsrs/moq-mux/src/follow.rsrs/moq-mux/src/lib.rsrs/moq-mux/src/source.rsswift/MIGRATE.mdswift/ffi/MIGRATE.md
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- quest/m1/announce-takeover.md
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A rendition the catalog delists drains the instance it reads, then ends its pad instead of idling for, or restarting on, the sibling's next instance. One already idle when the delist lands ends right away. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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- Line 1248: Update the pump completion path that removes an entry from active
to reconcile the latest catalog afterward, so a relisted rendition starts a
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moqsrc recorded a finished track by rendition and path, so a catalog update that replaced an idle sibling pump (a disable and enable, or an epoch handoff) skipped the rendition for every later instance, leaving its pad silent. The record now keeps the instance that finished, and the pump checks it once it knows which instance it reads, instead of reconcile skipping the rendition. A sibling pump idles past a finished instance, holding its pad if it has one; the catalog's own rendition still stops. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
# Conflicts: # cpp/moq/MIGRATE.md # dart/moq/MIGRATE.md # dart/moq_ffi/MIGRATE.md # dart/moq_ffi/lib/src/moq.dart # go/ffi/MIGRATE.md # go/wrapper/MIGRATE.md # kt/moq-ffi/MIGRATE.md # kt/moq/MIGRATE.md # py/moq-ffi/MIGRATE.md # py/moq-rs/MIGRATE.md # quest/m0/broadcast-epoch/README.md # quest/m1/reference-epoch-bindings.md # rs/moq-c/MIGRATE.md # rs/moq-ffi/MIGRATE.md # rs/moq-ffi/src/consumer.rs # rs/moq-mux/MIGRATE.md # rs/moq-mux/src/container/source.rs # rs/moq-mux/src/source.rs # swift/MIGRATE.md # swift/ffi/MIGRATE.md
moqsrc keeps today's sibling handling: a rendition binds its sibling through `Source::bind`, which now waits for the first announcement and keeps that instance. Following a sibling's later instances moves to the moqsrc sibling follow quest. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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ExportSource treated any read error as the instance's end once the sibling closed, so malformed media followed by a close exported as a clean EOF. Only a transport error ends the rendition with its instance. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A transport failure such as a protocol violation read after the sibling closes failed nothing: any moq-net error counted as the instance's end. Only an orderly shutdown (dropped, cancelled, closed, going away, or a cancelled session) ends the rendition; every other error fails the export. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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`Dropped` means a producer went away without finishing, so content is incomplete rather than ended. It no longer counts as an orderly end of the sibling instance. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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#6254 landed on main. Conflicts in the docs and quest files keep this branch's side, which describes moqsrc following siblings as done, and the completed moqsrc-sibling-follow quest stays removed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Completes quest/m0/broadcast-epoch/reference-announcements.md except moqsrc: native readers can follow a catalog-referenced sibling's announcements through
moq_mux::follow, the way@moq/watchalready does, and every other reader waits for a late sibling. moqsrc adoptingfollowis split into moq-dev/moq#6394, built on this branch.Changes
moq_mux::follow(Source::follow(rel, epoch),follow::Instances::new(origin, path, epoch)): built onorigin::Consumer::announced_broadcast, followed unpinned. Yieldsfollow::Event::Start(broadcast)for each instance that comes online or takes over, andfollow::Event::Endonce the one handed out stops serving (its broadcast closes). With anepoch, an instance proving another epoch is never handed out: one taking over ends the rendition, and the named instance starts it again if it returns. An epochless route stays best effort. A self-reference hands out only the catalog instance the source was built from and never reports its end, since the catalog's reader owns that.Source::bind/resolve/subscribe_trackwait for a sibling's first announcement (throughrouted_broadcast) instead of failingUnroutable, and keep the first instance they resolve. Once a path is pinned, a binding answers the pin and never polls its lookup again, so a sibling that announced and then left answers its ended broadcast at once rather than waiting for the next instance. This is what keeps moq-hls'sa_disconnected_sibling_publisher_answers_404correct. That test also named the wrong path (../sourcefromroom/liveresolves tosource), so it passed without ever binding the sibling; it now uses./sourceand covers a sibling that announced and then left.routed_broadcastregisters discovery interest, so it replaces theLookupthat moq-dev/moq#6165 added for lazily discovering client sessions; itsa_stalled_session_does_not_hold_up_a_siblingtest still passes.ExportSource): a late first announcement starts the rendition, andExportSourceends a sibling rendition once its instance closes and its delivered media is drained, instead of failing the export. Only an orderly shutdown (cancelled, closed, going away, or a cancelled session) counts as that end; malformed media, an unfinished (Dropped) track, or any other transport error still fails it. Restart stays with sink restart follow.Source::bind, so it inherits the wait for the first announcement and keeps that instance, likemoq play. Following later instances is moq-dev/moq#6394, tracked by the new moqsrc sibling follow quest under the epoch epic.moq playand the bindings (MoqBroadcastConsumer::resolve, the rendition-based subscribes and fetches, moq-c'smoq_consume_video/moq_consume_audio) inherit the wait throughSource::resolve. Inmoq play, a video rendition whose sibling is offline holds the start of audio until it is announced, the same way the inline wait for a video track's live edge already does.@moq/watch: a rendition whose followed broadcast proves another epoch than it names is dropped fromout.catalogtoo, so selection never picks one that cannot play.doc/concept/hang.md(who follows and who waits),doc/bin/gstreamer.md(moqsrc waits for a sibling), the moq-ffiresolvedoc, and MIGRATE entries for moq-mux, moq-ffi, moq-c, and every binding, kept beside main's entries from moq-dev/moq#6244, moq-dev/moq#6142, moq-dev/moq#6165, and moq-dev/moq#6250. Quest deleted; references point atmoq_mux::followor the new moqsrc quest, and the epoch epic now requires that quest.Decisions
The maintainer answered the three open decisions: "always wait for late siblings... exporters that can't should absolutely wait for all broadcasts. rename to follow::* and bind waits too."
bind/resolve/subscribe_trackanswer for the routes as they stand.bind/resolve/subscribe_trackwait too. No new API: a pinned binding answers its pin, which keeps HLS's "sibling left" answer bounded, andmoq playaccepts the wait like its existing live-edge wait.bindwaits, and HLS/moq playmove ontoSource::follownow (sink-restart-follow's scope).moq_mux::Follow/Followed { Start, End }.moq_mux::follow::{Instances, Event}:Instancesis the stream of publisher instances serving a path;Event::{Start, End}is a change to the one served.Source::followkeeps its name.[L]for the end-to-end relay and player test the README still owns).moq_mux::follow, waiting bind/resolve, exporters, HLS, watch, bindings); moqsrc's sibling following moves to moq-dev/moq#6394 on top of this branch, carrying the held CodeRabbit finding.How sink-restart-follow builds on this
Use
moq_mux::follow::Instances::new(&origin, path, None)for the broadcast a reader resolves, instead of a hand-rolledorigin.followloop. Eachfollow::Event::Start(broadcast)becomesmoq_mux::Source::new(origin, broadcast)(orSource::switchedfor the TS stitcher), so its siblings follow throughSource::followand its exporters pin throughSource::bind;follow::Event::Endis where a reader holds or ends its output.Public API and wire
followmodule (Instances,Event) andSource::follow.Source::bind,resolve, andsubscribe_trackwait for a sibling's first announcement instead of failingUnroutable, and answer a pinned instance that ended rather than waiting for the next (MIGRATE).@moq/watch:out.catalogdrops renditions whose broadcast proves another epoch (behavior only).Tests
a_binding_waits_for_the_first_announcement_and_keeps_it, replacingfailed_binding_does_not_retry_a_later_publisher); the follow suite infollow.rs(late start, End then Start, Restart with and without an epoch, epochless best effort, self-reference), and a self-reference whose epoch the catalog contradicts failingSource::follow.ExportSource): late start, a replacement never read, and End ending the rendition both mid-stream and while subscribing; a malformed frame, a protocol error, or an unfinished track read after the sibling closes still fails the export (a_sibling_failure_outlives_its_instance), while a sibling leaving over a session ends the rendition cleanly (a_remote_sibling_ends_with_its_instance).a_disconnected_sibling_publisher_answers_404now binds the sibling it names;a_sibling_announced_after_export_start_is_boundcovers the late sibling.@moq/watch: an epoch-named rendition leavesout.catalogwhile its sibling proves another epoch.Checks
origin/mainand splitting moqsrc:just checkexcept its flake module, which fails here building thegithub-runnerVM image (unshareis not permitted in this environment, unrelated to this change);cargo test --libfor moq-mux and moq-hls;cargo test -p moq-gst --lib sourceagainst main's moqsrc;quest check. The Dart bindings carry the regeneratedresolvechecksum.just test interop --all(no wire or gateway change; the moq-ffi change is a doc and inherited behavior), and the full workspace test suite.🤖 Generated with Claude Code
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