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wai: the carousel schedule — when each object passes on a bearer with no return path, and when a receiver holds it #592

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dcharlot commented 2026-11-02 23:12:07 -05:00
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Stacked on #589 (wai identify): both change the CHANGELOG head and the same lines of the conformance workflow, so this branch carries #589's commit and merges after it. Until #589 lands, the diff here shows both commits; this PR's own commit is the last one.

On a bearer with no return path (broadcast, satellite, one-way multicast), a receiver can't ask for what it missed. It holds an object only if the passes it heard carried enough encoding symbols. WAI could declare such a transmission (bearer-receipts) and reconcile it afterwards, but it had no signed statement of the plan in between: when each object passes, and with what forward error correction. Without one, a one-way bearer can't promise a deadline that anyone can check, and a receiver can't plan when to listen.

This adds wai.bearer.carousel (extensions/carousel.md) with the jwp-receipts claim class schedule (§2.4.16).

The claim

  • What it is: a publisher's signed plan, beside the group receipt and the instance's transmission claim, naming the group by its link hash.
  • What each object's entry states:
    • its code: RaptorQ (RFC 6330 with its verified erratum 5548) or Compact No-Code (RFC 5445);
    • that code's object transmission information;
    • the repair symbols each pass adds;
    • whether later passes repeat their ESIs or send new ones;
    • the first pass's instant, the period, the duration and the count of passes.
  • Step 4 holds each code's parameters to its bounds:
    • F up to 942,574,504,275;
    • T a multiple of Al, Z from 1 to 255, and N up to T/Al;
    • at most 56,403 source symbols per block, with RFC 6330's Partition[];
    • RFC 5052 §9.1 blocking within RFC 5445's 16-bit fields;
    • ESIs within their fields, passes that don't overlap, and at most 2^53 − 1 octets sent.
  • Step 6 checks each entry against the group: subject, signer, range, first pass not before group_start, content hash, and length where the bytes are held.

What a verifier derives

  • The pass after which an object is held, for a loss bound in parts per million. The answer holds for every pattern of loss within the bound.
    • A RaptorQ block counts as held at K′ + h distinct symbols, the count RFC 6330 §5.8 states its 10⁻² / 10⁻⁴ / 10⁻⁶ decoding-failure bounds at.
    • A symbol that a repeating pass missed is counted as missed again, so repeat and Compact No-Code never count on a second pass.
    • This is the deadline a one-way bearer can promise, checked with no receiver.
  • Statements that an object or a whole group is held by an instant: holds, availability_after_deadline, availability_not_within_schedule or object_not_scheduled.
  • Schedules set aside when they contradict each other, or when their instance is undeclared or two-way.
  • A receiver's listening plan: the passes that add symbols it is certain to keep, when it holds the object, and how long its radio must be on.

How it is checked

  • Corpus (live-conformance/carousel/):
    • 33 verdict cases;
    • 50 claim cases, covering every reachable bound of both codes, both met and passed;
    • 16 plans.
  • tests/carousel.rs, against an independent RFC 6330 implementation (the Apache-2.0 raptorq crate, added as a dev-dependency only):
    • K′ and Partition[] agree for every block size from 1 to 56,403;
    • every RaptorQ object a case holds available decodes from what a receiver within the case's loss bound holds by the end of that pass. In each pass the first ⌊L·m/10⁶⌋ symbols of each block are dropped, which in the first pass are source symbols, so the decoder must really decode.
  • Second implementation: carousel_verify.py, written from the text.
    • It agrees on all 99 cases.
    • It catches 10 of 10 mutated copies of the corpus.
    • All 14 versions of it with one check removed are caught by the corpus.
  • Claims: claim_verify.py carousel agrees with wai-rs on all 134 claims through steps 1–4. Its own corpus (636 vectors) and the bearer corpus (72 claims) still pass.
  • Independent expectations: the corpus states its expected passes by hand and computes the octets sent by a different formula from the module's, never copying either from the module.
  • HTTP delivery: a receipt index now checks a schedule claim against its group and listed objects, instead of accepting it after step 5. The rule is in http-delivery's text, in wai-rs and in http_receipts.py. The HTTP corpus has no schedule claim yet, so that branch is exercised only by compiling it.

Breaking

New variants in ClaimClass, ClaimBody and Reason; each is named in CHANGELOG.

🤖 Generated with Claude Code

Closed: Main moved under it: its CHANGELOG head now conflicts (the tariff version 6 entry of #591), and force-push is refused. Its commits, with those of #592 and #595 stacked on it, go linearly onto current main in one replacement pull request, with the conflict resolved and every check re-run there.

**Stacked on #589** (`wai identify`): both change the CHANGELOG head and the same lines of the conformance workflow, so this branch carries #589's commit and merges after it. Until #589 lands, the diff here shows both commits; this PR's own commit is the last one. On a bearer with no return path (broadcast, satellite, one-way multicast), a receiver can't ask for what it missed. It holds an object only if the passes it heard carried enough encoding symbols. WAI could declare such a transmission (bearer-receipts) and reconcile it afterwards, but it had no signed statement of the plan in between: when each object passes, and with what forward error correction. Without one, a one-way bearer can't promise a deadline that anyone can check, and a receiver can't plan when to listen. This adds `wai.bearer.carousel` (extensions/carousel.md) with the jwp-receipts claim class `schedule` (§2.4.16). ## The claim - **What it is:** a publisher's signed plan, beside the group receipt and the instance's transmission claim, naming the group by its link hash. - **What each object's entry states:** - its code: RaptorQ (RFC 6330 with its verified erratum 5548) or Compact No-Code (RFC 5445); - that code's object transmission information; - the repair symbols each pass adds; - whether later passes repeat their ESIs or send new ones; - the first pass's instant, the period, the duration and the count of passes. - **Step 4** holds each code's parameters to its bounds: - F up to 942,574,504,275; - T a multiple of Al, Z from 1 to 255, and N up to T/Al; - at most 56,403 source symbols per block, with RFC 6330's Partition[]; - RFC 5052 §9.1 blocking within RFC 5445's 16-bit fields; - ESIs within their fields, passes that don't overlap, and at most 2^53 − 1 octets sent. - **Step 6** checks each entry against the group: subject, signer, range, first pass not before `group_start`, content hash, and length where the bytes are held. ## What a verifier derives - **The pass after which an object is held,** for a loss bound in parts per million. The answer holds for every pattern of loss within the bound. - A RaptorQ block counts as held at K′ + h distinct symbols, the count RFC 6330 §5.8 states its 10⁻² / 10⁻⁴ / 10⁻⁶ decoding-failure bounds at. - A symbol that a repeating pass missed is counted as missed again, so `repeat` and Compact No-Code never count on a second pass. - This is the deadline a one-way bearer can promise, checked with no receiver. - **Statements** that an object or a whole group is held by an instant: holds, `availability_after_deadline`, `availability_not_within_schedule` or `object_not_scheduled`. - **Schedules set aside** when they contradict each other, or when their instance is undeclared or two-way. - **A receiver's listening plan:** the passes that add symbols it is certain to keep, when it holds the object, and how long its radio must be on. ## How it is checked - **Corpus** (`live-conformance/carousel/`): - 33 verdict cases; - 50 claim cases, covering every reachable bound of both codes, both met and passed; - 16 plans. - **`tests/carousel.rs`**, against an independent RFC 6330 implementation (the Apache-2.0 `raptorq` crate, added as a dev-dependency only): - K′ and Partition[] agree for every block size from 1 to 56,403; - every RaptorQ object a case holds available decodes from what a receiver within the case's loss bound holds by the end of that pass. In each pass the first ⌊L·m/10⁶⌋ symbols of each block are dropped, which in the first pass are source symbols, so the decoder must really decode. - **Second implementation:** `carousel_verify.py`, written from the text. - It agrees on all 99 cases. - It catches 10 of 10 mutated copies of the corpus. - All 14 versions of it with one check removed are caught by the corpus. - **Claims:** `claim_verify.py carousel` agrees with wai-rs on all 134 claims through steps 1–4. Its own corpus (636 vectors) and the bearer corpus (72 claims) still pass. - **Independent expectations:** the corpus states its expected passes by hand and computes the octets sent by a different formula from the module's, never copying either from the module. - **HTTP delivery:** a receipt index now checks a schedule claim against its group and listed objects, instead of accepting it after step 5. The rule is in http-delivery's text, in wai-rs and in `http_receipts.py`. The HTTP corpus has no schedule claim yet, so that branch is exercised only by compiling it. ## Breaking New variants in `ClaimClass`, `ClaimBody` and `Reason`; each is named in CHANGELOG. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --- **Closed:** Main moved under it: its CHANGELOG head now conflicts (the tariff version 6 entry of #591), and force-push is refused. Its commits, with those of #592 and #595 stacked on it, go linearly onto current main in one replacement pull request, with the conflict resolved and every check re-run there.
wai identify: what any file is, from its bytes alone
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662803c105 
`wai inspect` reads envelopes; most files a toolchain meets are not envelopes, and the
first question about one is what it is. `wai identify <file>` (operation media.inspect,
extensions/media-identify.md) answers it for any file:

- the formats the bytes fit, each with the offsets of the bytes that say so, how far its
  structure was followed and where and why that stopped;
- a container's tracks as it states them: codec, size, channels, rate, protection;
- the registered capabilities they map to, and what a format probe reads of them;
- signatures found inside the file;
- where no format is recognised, measures that still hold: how the byte values are
  spread, uniform windows, and the lags at which the bytes repeat.

The verdict is identified, ambiguous, signature_only or unknown, and there is no
confidence figure: a candidate's strength says what was checked. Nothing is decoded, no
protected track is opened, and unknown stays unknown. Walks cover ISO media, Matroska,
transport streams, Ogg, FLAC, RIFF, MPEG audio, ADTS, PNG, JPEG, GIF, IVF, YUV4MPEG2,
FLV, AV1 OBU and Annex B streams, and HLS and DASH text; 35 more formats are known by
their signature. Every walk is bounded, reads a file where its lengths lead (a large file
is never held whole), and has been given hostile bytes; it builds for wasm32.

The agent door has it as media_inspect, its results marked untrusted_content: a file's
author chooses the strings in it.

identify-conformance/ holds files written by real muxers and encoders from test patterns
and tones, what an independent media prober reads of them (prober.json), and generated
cases sitting on each rule's edge. identify_verify.py is a second implementation written
from the text; it reads the extension's tables, gives every file its whole result, and
holds ext/ to the prober's reading. tests/identify.rs holds the reference's tables to
the extension's.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai: the carousel schedule — when each object passes on a bearer with no return path, and when a receiver holds it
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cac615830a 
On a bearer with no return path a receiver cannot ask for what it missed: it holds an object
only if the passes it heard carried enough encoding symbols. bearer-receipts declares the
transmission and reconciles it afterwards; nothing stated the plan in between.

extensions/carousel.md registers `wai.bearer.carousel` and the jwp-receipts claim class
`schedule` (§2.4.16): a publisher's signed plan, beside the group receipt and the instance's
transmission claim, naming for each object its forward error correction (RaptorQ, RFC 6330 with
its verified erratum 5548; Compact No-Code, RFC 5445) and that code's object transmission
information, the repair symbols each pass adds, whether later passes repeat their ESIs or send
new ones, and the passes' times and count. Step 4 holds each code's parameters to its bounds
and division into source blocks; step 6 holds the entries to the group, its objects' content
hashes and, where the bytes are held, their lengths.

From it a verifier derives, for a loss bound in parts per million, the pass after which a
receiver whose losses stay within it holds each object, for every pattern of loss within the
bound: a RaptorQ block at K' + h distinct symbols, the count RFC 6330 §5.8 states its decoding
failure bound at, and a symbol a repeating pass missed counted as missed again. It checks a
statement that an object or a group is held by an instant, sets aside schedules that contradict
each other or whose instance is undeclared or two-way, and a receiver derives the passes it
must listen to and how long its radio must be on.

The reference is the `carousel` module of wai-rs with the class's body in
`claim_receipt::schedule`; the corpus is live-conformance/carousel/ (33 verdicts, 50 claims, 16
plans) with carousel_verify.py as its second implementation and claim_verify.py's new
`carousel` mode for steps 1-4. tests/carousel.rs checks K' and Partition[] against an
independent RFC 6330 implementation (a dev-dependency) for every block size, and decodes each
RaptorQ object a case holds available from what a receiver within the bound holds. A receipt
index served over HTTP now checks a schedule claim against its group and listed objects.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
int_kernels_vectors: the identify corpus decodes nothing
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9680914bb5 
every_decoded_output_states_a_sha256 requires each conformance directory to state its decoded
outputs' SHA-256 or say why it has none. identify-conformance decodes nothing: each vector states
what a file's bytes are read as, and the file's SHA-256 in vectors.json.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
wai mcp: media_inspect is in the core toolset's list
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716dfd41d3 
The core toolset serves media_inspect after envelope_inspect; tests/cli_mcp.rs and the
README's toolset table now name it in that place.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
carousel §11: the patents disclosed on RaptorQ and Raptor, and no-code as the default
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f64d8fb533 
The IETF holds disclosures on RaptorQ (RFC 6330; #2554 current, updating #1958) and on Raptor
(RFC 5053; #1957 current, with #1176 the holder's general licence statement). Both current
ones give two terms by product: a licence within the holder's standard terms for a device that
implements a wireless wide-area standard, and a non-assertion, conditional on full
implementation and suspended against a party that asserts, for one that implements none. No
disclosure relates to RFC 5445 or RFC 5052.

§11 cites them by number and states each licence class as disclosed. Since neither code is
royalty-free for every implementer, no-code is the default a tool that writes schedules uses,
as SPEC §5 keeps a capability that is not royalty-free from being a default. The reference
implementation encodes and decodes no symbol; its RFC 6330 decoder is a development dependency.
Security and privacy considerations move to §12; nothing cites them by number.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
dcharlot closed this pull request 2026-11-03 16:46:29 -05:00
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