packaging: a title's whole ladder in one package — several floors, a re-pack, CMAF floors, floor-only, a streaming packer, the verifier at scale #426

Closed
dcharlot wants to merge 14 commits from wai/pack-efficiency into main
331 changed files with 7166 additions and 612 deletions

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@ -20,7 +20,8 @@ name: wai-pack
#
# Push filters match the push's delta, so every path a build or a verifier reads is
# listed: the crate, the wai crate it builds on, the corpus, the BLAKE3, integer payload,
# staged-delivery and staged-measurement verifiers and the registry export pack_verify.py
# staged-delivery and staged-measurement verifiers, the claim verifier (a metered
# package's claim) and the OER verifier it imports, the registry export pack_verify.py
# reads, and this file.
concurrency:
@ -35,6 +36,8 @@ on:
- 'wai/pack-conformance/**'
- 'wai/claim-conformance/_blake3.py'
- 'wai/claim-conformance/_ed25519.py'
- 'wai/claim-conformance/claim_verify.py'
- 'wai/oer-conformance/oer2_verify.py'
- 'wai/int-payload-conformance/int_payload_verify.py'
- 'wai/staged-conformance/staged_verify.py'
- 'wai/staged-measure-conformance/sim_verify.py'
@ -127,10 +130,15 @@ jobs:
[ "$n" -ge "$floor" ] || { echo "::error::$target lists $n tests, under its floor of $floor"; fail=1; }
done <<'EOF'
--lib 34
--test=cmaf 4
--test=conformance 1
--test=packs 7
--test=floor_only 2
--test=ladder 3
--test=pack_alloc 1
--test=packs 8
--test=review 9
--test=refusals 5
--test=refusals 6
--test=repack 3
--test=scenecut 3
--test=source_alloc 1
--test=staged 10
@ -163,6 +171,12 @@ jobs:
working-directory: wai
shell: bash
run: python3 pack-conformance/pack_verify.py pack-conformance
# The same checks with the hashes and decodes run ahead in worker processes
# (--jobs): every check and its reason are the serial run's.
- name: pack_verify.py --jobs 2
working-directory: wai
shell: bash
run: python3 pack-conformance/pack_verify.py --jobs 2 pack-conformance
- name: Install Rust 1.98.0
shell: bash
run: |
@ -207,6 +221,13 @@ jobs:
set -euo pipefail
python3 ../pack-conformance/stage_diff.py target/debug/wai-pack 1 1000
python3 ../pack-conformance/stage_diff.py target/release/wai-pack 2 3000
# The supplied CMAF reader differentially (packaging §7.7): seeded alterations of a
# media muxer's segments and of §7.6's writer's, every verdict and accepted segment's
# samples of wai-pack's reader equal to pack_verify.py's.
- name: cmaf_diff.py, wai-pack against pack_verify.py
shell: bash
working-directory: wai/wai-pack
run: python3 ../pack-conformance/cmaf_diff.py target/release/wai-pack 1 3000
# A still's reader differentially: the zlib library's own streams, dynamic blocks
# built on each of RFC 1951's and zlib's code-set rules, and their alterations, every
# verdict of wai-pack's reader equal to pack_verify.py's, which inflates with
@ -232,27 +253,31 @@ jobs:
SUDO=""; [ "$(id -u)" -ne 0 ] && SUDO="sudo"
$SUDO apt-get update -qq
$SUDO apt-get install -y -qq ffmpeg
# Test 14: the golden's init.mp4 and its fragments, in its floor playlist's order,
# read as one AV1 track of every frame of the source, with a key frame at each piece
# start of the plan and nowhere else, and decode without an error.
# Test 14: each golden floor's init.mp4 and its fragments, in its floor playlist's
# order, read as one AV1 track of every frame of the source, with a key frame at each
# piece start of the plan and nowhere else, and decode without an error; a ladder
# golden has one floor playlist per floor rung (packaging §7.1), each read so.
- name: The goldens' floors read and decode
shell: bash
working-directory: wai/pack-conformance/packs
run: |
set -euo pipefail
for g in video-base-01 video-staged-01; do
for g in video-base-01 video-staged-01 video-ladder-01 video-cmaf-01 video-floor-only-02; do
( cd "$g/package"
tmp=$(mktemp -d)
cat floor/v/init.mp4 $(grep -v '^#' hls/classic/floor-v.m3u8 | sed 's#^\.\./\.\./##') > "$tmp/floor.mp4"
ffprobe -v error -count_frames -select_streams v:0 -show_entries stream=codec_name,width,height,nb_read_frames -of default=nw=1 "$tmp/floor.mp4" | tee "$tmp/probe.txt"
grep -qx 'codec_name=av1' "$tmp/probe.txt"
grep -qx 'nb_read_frames=200' "$tmp/probe.txt"
keys=$(ffprobe -v error -select_streams v:0 -show_entries packet=pts,flags -of csv=p=0 "$tmp/floor.mp4" | awk -F, '$2 ~ /K/ {print $1}' | tr '\n' ' ')
want=$(tr '\n' ' ' < plan-v.txt)
echo "$g key frames: $keys"
[ "$keys" = "$want" ] || { echo "::error::$g: key frames at $keys; the plan says $want"; exit 1; }
ffmpeg -v error -xerror -i "$tmp/floor.mp4" -f null -
echo "$g: the floor reads as one AV1 track of 200 frames, a key frame at each piece start" )
for pl in hls/classic/floor-*.m3u8; do
f=$(basename "$pl" .m3u8); f=${f#floor-}
tmp=$(mktemp -d)
cat "floor/$f/init.mp4" $(grep -v '^#' "$pl" | sed 's#^\.\./\.\./##') > "$tmp/floor.mp4"
ffprobe -v error -count_frames -select_streams v:0 -show_entries stream=codec_name,width,height,nb_read_frames -of default=nw=1 "$tmp/floor.mp4" | tee "$tmp/probe.txt"
grep -qx 'codec_name=av1' "$tmp/probe.txt"
grep -qx 'nb_read_frames=200' "$tmp/probe.txt"
keys=$(ffprobe -v error -select_streams v:0 -show_entries packet=pts,flags -of csv=p=0 "$tmp/floor.mp4" | awk -F, '$2 ~ /K/ {print $1}' | tr '\n' ' ')
want=$(tr '\n' ' ' < plan-v.txt)
echo "$g $f key frames: $keys"
[ "$keys" = "$want" ] || { echo "::error::$g $f: key frames at $keys; the plan says $want"; exit 1; }
ffmpeg -v error -xerror -i "$tmp/floor.mp4" -f null -
echo "$g $f: the floor reads as one AV1 track of 200 frames, a key frame at each piece start"
done )
done
licences:

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@ -6,6 +6,89 @@ wire format may change and such changes are recorded here.
## v0.4.0 — current
### Packaging: a title's whole ladder in one package
- **Several floor rungs per package** ([packaging](extensions/packaging.md) §7.1). A
component may have any number of floor rungs; each piece then has one floor object per
floor rung, in ladder order, all over one base, so the base of a ladder is coded once.
Each floor rung has a **floor name**: the component's id when it has one floor rung (so
existing packages are unchanged, byte for byte), the rung's id when it has several. The
name names the supplied stream (`<name>.obu`, §7.3), the CMAF files (`floor/<name>/`,
§7.6), the floor playlist (`hls/classic/floor-<name>.m3u8`), the DASH representation
(`<name>-floor`) and the MoQ track (`<name>/floor`); a floor name that cannot be one path
segment, or two equal in any case, is refused (`pack-id`). The classical master lists one
variant per floor rung; with several, `dash/classic.mpd` carries each representation's
codecs and size on the representation. The verifier holds the *k*-th floor entry of each
piece to the *k*-th floor rung.
- **A re-pack from a parent** (§11.5). A packer may take every piece's base and
refinements from an earlier package instead of coding them (`wai-pack pack
--base-from <package>`), so a title's integer base is coded once and taken by every
package made from the same source after it. It refuses a parent that does not verify
(`repack-parent-invalid`), one whose pieces, kinds, rungs, parameters or deadlines are
not this pack's (`repack-parent-mismatch`), and one whose prefixes do not reconstruct
this source with the SSE their entries state (`repack-source-mismatch`). Its receipt
names the parent with parent kind `re-pack`, and its other files are those of a pack
that codes. A verifier holding the parent checks the re-pack against it (`wai-pack
verify --parent`).
- **A floor that is the ladder's own CMAF segments** (§7.7). With
`floor.supplied_form = "cmaf"` (absent, the OBU form; existing policy digests are
unchanged), a supplied floor is an existing ladder's `init.mp4` and media segments, one
segment per piece, read box by box: the floor's temporal units are the samples, each
with a temporal delimiter before it. The package's floor files are the ladder's files,
byte for byte, named by their SHA-256, and the package carries the supplied floor's
listing (`floor.listing`), whose SHA-256 the policy pins, so the receipt binds every
byte of the ladder. A server can hold those files once for the classic site and the
package. New refusals: `floor-cmaf-malformed`, `floor-cmaf-timing`, `floor-cmaf-pieces`.
`wai-pack pack --link-supplied` writes them as hard links to the supplied files.
- **A floor-only profile** (§7.8). A component of `profile = "floor-only"` is its floor
rungs alone: no integer base, no refinement, no source (`policy-floor-only`
otherwise). Its pieces are its first floor rung's media segments (the CMAF form) or
shown key frames (the OBU form), each at most `max_ms` (`floor-piece-length`); each piece
is its floor objects, which present no base and so carry no `derived_from`, and its kind
is `none` (stage index kind 6). It attests delivery: the receipt binds every floor
object and the supplied floor's bytes, and the verifier holds them to the AV1 stream's
structure and the CMAF files; it states no decoded output, no fidelity to a source and
no primary. The stage index now requires a floor's `derived_from` exactly when its piece
has a base (`floor-derived-from`).
- **The independent verifier at scale** (`pack_verify.py`). Each object is hashed once,
and `http_verify.resolve_uri` finds an object by its content id rather than by hashing
every object for every URI. `--jobs N` runs every object's hash and every base's decode
and layers in N worker processes, piece by piece, ahead of checks that are unchanged in
order and reason. `--native-blake3` takes BLAKE3 from the `blake3` module after it
agrees with the pure implementation on the published vectors (opt-in: that module is
the implementation wai-rs links). `--package <dir>` verifies one package without its
sources or its key. **The measurement claim is checked** (§9.4): the claim corpus's
verifier reads it, and it is held to the receipt's figure, class, evidence and signer, so
a correctly metered package passes; `package-mutations/` gains a metered package (`ok`),
a claim about another figure (`measurement-claim-invalid`) and none
(`measurement-claim-missing`).
- **§7.3: key-frame sequence headers** (an informative note). A floor taken from an
existing ladder needs a sequence header in every key-frame unit; a producer that puts
one back must put back the stream's own first sequence header, byte for byte, not the
sample entry's `av1C` header, which can differ in its tool flags and is refused
(`floor-av1-malformed`). `tests/refusals.rs` holds the rule.
- **The DASH renderer** (`wai::http_binding::dash`) writes a representation's own
`@codecs`, `@width` and `@height` when given, and an adaptation set's `@codecs` only when
every representation shares it.
- **A streaming on-demand packer** (§11.4). The packer reads the source twice, a frame
at a time, once to cut it and once to code it, and each floor stream a temporal unit at
a time, and `wai-pack pack` writes each file into its directory as it is made, reading
objects back for the catalogs. What it holds no longer grows with the title, but for a
record per piece and per entry and a byte per frame per floor; a refusal removes what it
wrote. `--jobs <n>` codes n pieces at once, each alone, so the package is the same for
any n. A source that does not read the same twice is refused (`pack-source-changed`).
`tests/pack_alloc.rs` packs a source eight times as long in the same peak memory.
- **Conformance.** `packs/video-ladder-01/` (two floors, one at half size, over
`video-base-01`'s bases, which are the same objects), `ladder-mutations/`,
`packs/video-repack-01/` (the ladder re-packed from `video-base-01`),
`packs/video-cmaf-01/` and `cmaf-mutations/` (the ladder's streams as a muxer's fMP4
segments), `packs/video-floor-only-01/` and `-02/` (both forms, no base), index cases of
a piece of floors alone, `tests/ladder.rs`, `tests/repack.rs`, `tests/cmaf.rs`,
`tests/floor_only.rs`, and the independent
verifier `pack_verify.py`, with a box reader of its own, which re-derives every golden
from its sources and checks the re-pack against its parent. `supplied_floor.py` writes
one stream per floor rung; `supplied_cmaf.py` the CMAF form.
### `wai.media.exploration`: archives that replay, default-distance, a homogenization meter, and taste as a declared, owned objective
- **The extension** ([exploration](extensions/exploration.md)) registers the record

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@ -4,11 +4,14 @@
> this extension fixes what a verifier recomputes. This revision defines the policy,
> its digest and what it may ask a packager to emit (§3), how a source is cut into
> pieces (§4), the objects a packager writes, refinements and stills among them, and a
> piece's ladder (§5), the stage index (§6), the floor (§7), what each class is offered
> piece's ladder (§5), the stage index (§6), the floor, one or several, supplied as OBU
> streams or as an existing ladder's CMAF files (§7), what each class is offered
> over HTTP and MoQ and how its delivery is simulated (§8), the package receipt and live
> windows (§9), and the package and its verification (§11). Reference impl: `wai-pack` —
> windows (§9), and the package, its verification and a re-pack from a parent (§11).
> Reference impl: `wai-pack` —
> `policy`, `capcheck`, `source`, `scenecut`, `classify`, `plan`, `encode`, `png`,
> `floor`, `cmaf`, `catalog`, `pack`, `live`, `delivery`, `verify`; in `wai-rs`, the
> `floor`, `cmaf`, `cmaf_read`, `catalog`, `files`, `pack`, `live`, `delivery`, `verify`;
> in `wai-rs`, the
> encoder `int_video_enc`, the refinement encoder `staged::wir1`, the stage index
> `stage_index`, the receipt `package` and the delivery simulator `stage_measure::sim`;
> the corpus [`pack-conformance/`](../pack-conformance/). Keywords **MUST**, **MUST NOT**,
@ -32,6 +35,9 @@ where it names them.
- **Class**: a delivery profile the policy names.
- **Moment**: a declared span of presentation time with tags.
- **Floor**: a rendition in a standard codec, for sinks that lack the primary.
- **Floor name**: the name a floor rung's files and catalog entries carry (§7.1): its
component's id when the component has one floor rung, the rung's id when it has
several.
- **Timebase** of a component: `num / den` units per second. For video one unit is
one frame; for audio, one sample.
@ -81,6 +87,7 @@ absent table reads as empty.
| `component.media` | string | required | `video`, `image`, `audio`, `world`, `feed`, `avatar`, `film` |
| `component.source` | string | absent | |
| `component.timebase` | table | required | members `num`, `den`, each 1 to `2^32 − 1`, required |
| `component.profile` | string | absent | `floor-only` (§7.8); absent, the standard profile |
| `segmentation.target_ms` | integer | 2000 | |
| `segmentation.min_ms` | integer | 1000 | |
| `segmentation.max_ms` | integer | 4000 | |
@ -99,6 +106,7 @@ absent table reads as empty.
| `ladder.params` | table | empty | by capability, below |
| `floor.supplied_listing` | string | absent | 64 lowercase hexadecimal digits |
| `floor.extra_keyframes` | boolean | `false` | |
| `floor.supplied_form` | string | absent | `cmaf` (§7.7); absent, the OBU form (§7.3) |
| `live.layer_lag_ms` | array of integers | one 0 per layer | §3.4 |
| `class` | array of tables | empty | |
| `class.id` | string | required | 1 to 255 bytes |
@ -157,15 +165,17 @@ first that fails is the refusal:
chain of `refines` returns to a rung it passed (`policy-refines-cycle`); every
chain stays in its component and ends at a base (`policy-refines-base`); no rung is
refined twice (`policy-refines-branch`).
8. Every component has a base rung (`policy-no-base`).
8. Every component has a base rung (`policy-no-base`), but a floor-only one (§7.8), which
has no base and no refinement rung, no `source`, and at least one floor rung
(`policy-floor-only`).
9. A rung's **layer** is 0 for a base or a floor, and one more than the rung it
refines for a refinement; the policy has one more layer than its highest rung
layer. No class's and no rule's `max_layer` exceeds the highest
(`policy-class-layer`).
10. A rule's `then.ladder` names known rungs, all of one component, each once:
exactly one base, every refinement over a rung it names (so its layers are a chain
from that base), and every floor rung of the component (every piece has a floor,
§7.1) (`policy-rule-ladder`).
exactly one base (none, for a floor-only component), every refinement over a rung it
names (so its layers are a chain from that base), and every floor rung of the
component (every piece has a floor, §7.1) (`policy-rule-ladder`).
11. `live.layer_lag_ms` has one entry per layer, the first 0, the entries
non-decreasing (`policy-layer-lag`).
12. The deadline values (`defaults.deadline_ms` and every rule's `then.deadline_ms`)
@ -205,8 +215,9 @@ no reference outside the piece, and no later object of the package references in
it.
**4.2** Piece boundaries are a pure function of the source frames and the effective
policy. Where the policy names `wai.pack.scenecut/1`, the boundaries **MUST** be those
§4.3 computes. The list of piece starts, in timebase units, is the **plan**, and its
policy; a floor-only component's, which has no source, of its first floor rung (§7.8).
Where the policy names `wai.pack.scenecut/1`, the boundaries of a component with a
source **MUST** be those §4.3 computes. The list of piece starts, in timebase units, is the **plan**, and its
digest is
BLAKE3("wai:pack-plan\x01" ‖ u64 LE n ‖ n × u64 LE start)
@ -475,7 +486,7 @@ bytes are zero.
| 8 | 4 | `duration`, in timebase units |
| 12 | 4 | `first_entry`, window-relative |
| 16 | 2 | `n_entries` |
| 18 | 1 | `kind`: 0 natural, 1 static, 2 synthetic, 3 motion_high (§4.6), 4 world segment, 5 audio |
| 18 | 1 | `kind`: 0 natural, 1 static, 2 synthetic, 3 motion_high (§4.6), 4 world segment, 5 audio, 6 none (a floor-only component's piece, which no source classifies, §7.8) |
| 19 | 1 | flags: bit 0 scene cut, bit 1 forced at `max` (§4.3), bit 2 started by a cue, bit 3 aligned to the lead (§4.5) |
| 20 | 4 | `rules`: bit *i* set when rule *i* matched the piece (§8.1) |
| 24 | 4 | `moments`: bit *i* set when the piece lies in moment *i* (§8.1) |
@ -562,7 +573,9 @@ of these, checked in this order:
(`layer-gap`); its tier (§6.4: `tier-entropy-passthrough`, `tier-weakest`, then
`tier-mismatch`); a non-zero `prefix_digest` with a tier other than
decode-equivalence (`digest-without-tier`); a deadline on an entry that is not a
refinement (`deadline-role`); a floor without flag bit 2 (`floor-derived-from`); a
refinement (`deadline-role`); a floor whose flag bit 2 is not set exactly when its
piece has a base, so a floor presents its piece's base and a piece of floors alone
presents none (`floor-derived-from`); a
content hash an earlier entry has at another length (`dup-length`); the duplicate
flag other than set exactly when an earlier entry has the content hash (`dup-flag`).
3. Class by class: a flag with no meaning (`class-flags`); a plan value other than
@ -615,12 +628,18 @@ and one without the source cannot. A floor's `sse` is `2^64 − 1`.
**7.1** Every piece of a video, image or audio component **MUST** have a floor rendition
in a capability of SPEC §5's mandatory floor or recommended set; a packager refuses a
video component with no floor rung (`floor-missing`). A film or world package SHOULD
have one. This revision packs a supplied AV1 floor (`wai.video.av1` or
`wai.video.av1.lossless`, `source = "supplied"`).
have one. A component may have several floor rungs: each piece then has one floor object
per floor rung, in ladder order (§5.7), so one package carries a ladder of standard-codec
renditions over one base, which is coded once. Each floor rung has a floor name (§2): the
component's id when the component has one floor rung, the rung's id when it has several.
A floor name names files (§7.3, §7.6, §8.3), so one that cannot be one path segment of a
listing, or two floor names of a package equal once `A`–`Z` are mapped to `a`–`z`, are
refused (`pack-id`, §11.1). This revision packs supplied AV1 floors (`wai.video.av1` or
`wai.video.av1.lossless`, `source = "supplied"`), one stream per floor rung.
**7.2** *Floor objects.* Each piece's floor is one object of the floor rung's capability
(§5.2), whose manifest carries `derived_from` (SPEC §7.1, *Derived renditions*) naming
the piece's base: `motif` the base's content hash, `motif_capability` its capability,
(§5.2), whose manifest carries `derived_from` (SPEC §7.1, *Derived renditions*), but in a
floor-only component (§7.8), naming the piece's base: `motif` the base's content hash, `motif_capability` its capability,
`renderer` the floor's maker, and `settings` `BLAKE3("wai:render-settings\x01" ‖
JCS(settings))` (§3.6). For a supplied floor, `renderer` is `supplied@<the supplied
listing's SHA-256>` and the settings are `{"source": "supplied", "supplied_listing":
@ -633,13 +652,15 @@ sequence header's maximum frame height and width, the component's timebase `num`
`den`), then each temporal unit as a `u32` little-endian length and its bytes as the
stream holds them.
**7.3** *A supplied floor* is a directory holding, per video component, `<id>.obu`: an
AV1 stream in the low-overhead OBU format (every OBU with its size field), one temporal
unit per source frame. Its listing (SPEC §3.1) of every file is pinned by the policy's
`floor.supplied_listing`. A packager **MUST** refuse, before it writes anything:
**7.3** *A supplied floor* is a directory holding, per floor rung of a video component,
`<floor name>.obu` (§7.1): an AV1 stream in the low-overhead OBU format (every OBU with
its size field), one temporal unit per source frame. Its listing (SPEC §3.1) of every
file is pinned by the policy's `floor.supplied_listing`. A packager **MUST** refuse,
before it writes anything, the directory and then each floor rung's stream in ladder
order:
- a directory whose listing does not hash to `floor.supplied_listing`
(`floor-listing-mismatch`), and a component with no stream in it
(`floor-listing-mismatch`), and a floor rung with no stream in it
(`floor-stream-missing`);
- a stream that does not split into temporal units each holding a frame, whose first
unit holds no sequence header, with a sequence header whose bytes differ from the
@ -652,6 +673,18 @@ unit per source frame. Its listing (SPEC §3.1) of every file is pinned by the p
`KEY_FRAME` and `show_frame` 1, or the sequence uses the reduced still-picture header;
a unit that shows an existing frame does not.
*Key-frame sequence headers (informative).* A floor taken from an existing ladder without
re-encoding (its CMAF samples demuxed to this form, each with its temporal delimiter put
back) needs a sequence header in every unit that starts at a shown key frame. Where a
ladder's key-frame samples lack one, a producer that puts one back must put back the
stream's own first sequence header OBU, byte for byte, after each such unit's temporal
delimiter: §7.3 refuses any other bytes (`floor-av1-malformed`). The sequence header in
the ladder's sample entry (`av1C`) is not always the stream's: an encoder may write it
before it settles its coding tools, so that it differs from the in-band one in its tool
flags, and a stream with that header put back is refused. The packager writes its own
`av1C` from the in-band header (§7.6). A ladder whose key frames carry no in-band header
cannot be taken in the CMAF form (§7.7), whose units are its samples as they are.
The plan a supplied floor is made against is the **keyframe plan**, the file
`plan-<id>.txt`: each piece's first frame in decimal, one per line, each line ended by a
line feed. Its pieces' starts are the plan of §4.2, and `wai-pack plan` writes it from the
@ -663,10 +696,10 @@ no tier or `replicate` claim covers it.
**7.5** A floor produced by an encoder that is not a pure function of its input (§11)
**MUST** name that encoder and its version in `derived_from.renderer`.
**7.6** *CMAF.* The floor of a video component is also written as CMAF files, which no
stage index lists: `floor/<id>/init.mp4`, and one fragment per piece,
`floor/<id>/<SHA-256 of the fragment>.m4s`. Box layouts are ISO/IEC 14496-12's, with the
AV1 binding's sample entry; every integer is big-endian and every time 0:
**7.6** *CMAF.* Each floor rung's floor is also written as CMAF files, which no stage
index lists: `floor/<floor name>/init.mp4`, and one fragment per piece,
`floor/<floor name>/<SHA-256 of the fragment>.m4s`. Box layouts are ISO/IEC 14496-12's,
with the AV1 binding's sample entry; every integer is big-endian and every time 0:
- `init.mp4`: `ftyp` (major brand `cmfc`, minor version 0, compatible `cmfc`, `iso6`,
`av01`), then `moov` holding `mvhd` (version 0, timescale `tb_num`, rate 1, volume 1,
@ -692,6 +725,100 @@ AV1 binding's sample entry; every integer is big-endian and every time 0:
The codecs string of the floor is the AV1 binding's short form,
`av01.<profile>.<level, two digits><M or H>.<bit depth, two digits>`.
**7.7** *A supplied CMAF floor.* With `floor.supplied_form = "cmaf"`, a supplied floor is
an existing ladder's CMAF files rather than OBU streams: per floor rung of floor name *f*
(§7.1), a directory `<f>/` holding `init.mp4` and the floor's media segments, which are
every other file of `<f>/`, each named `*.m4s` and in no directory below it, in byte order
of their names, at least one. The floor's temporal units are the segments' samples, in
order, each a temporal unit without its temporal delimiter: a unit is the two bytes
`0x12 0x00` (a temporal delimiter OBU with its size field and no extension) followed by the
sample. Boxes are ISO/IEC 14496-12's; a box's 32-bit size is at least 8, a size of 1 is the
64-bit size that follows its type (at least 16), and a size of 0 is refused; a box's
children tile its body:
- `init.mp4`: its top-level boxes tile the file; one `moov`, holding one `trak` and one
`mvex`; the `trak`'s `tkhd` names the track, its `mdia`'s `mdhd` gives the timescale
*T*, its `hdlr` is of handler type `vide`, and its `stsd` holds one sample entry, of type
`av01`; an `edts`, where the `trak` has one, holds an `elst` of one entry, at media
time 0 and rate 1; and the `mvex` holds one `trex`, of the track, whose defaults a
sample takes.
- a media segment: its top-level boxes tile the file: boxes of the types `styp`, `sidx`,
`prft`, `emsg`, `free` and `skip`, then one or more `moof`, each followed by an `mdat`,
and nothing else. A `moof` holds an `mfhd` and one `traf`, and nothing else; the `traf`
holds one `tfhd` of the track, one `tfdt` and one or more `trun`, and nothing else; the
`tfhd`'s flags are among `0x2`, `0x8`, `0x10`, `0x20` and `0x20000` (no base data
offset, no empty duration); each `trun`'s are among `0x1`, `0x4`, `0x100`, `0x200`,
`0x400` and `0x800`, `0x1` (its data offset) among them. A sample's duration, size and
flags are its `trun`'s (the first sample's flags its first-sample flags where the `trun`
gives them), else the `tfhd`'s defaults, else the `trex`'s; its bytes start at the
`moof`'s first byte plus its `trun`'s data offset, a run's samples one after another,
and lie in the `mdat` after the `moof`.
A packager **MUST** refuse, before it writes anything, after the directory's listing
(§7.3), floor rung by floor rung in ladder order and segment by segment in order:
1. a floor rung with no `<f>/init.mp4` (`floor-stream-missing`); another file of `<f>/`
that is not a media segment, or no media segment (`floor-cmaf-malformed`);
2. an `init.mp4` that is not the above (`floor-cmaf-malformed`), or whose timescale is 0
or whose edit list is another (`floor-cmaf-timing`);
3. a media segment that is not the above, or that holds a sample of no bytes
(`floor-cmaf-malformed`), or a sample with a composition offset other than 0 or a
`moof` whose decode time is not where the one before it ended (`floor-cmaf-timing`),
each where it is read; then one whose first sample is not a sync sample
(`sample_is_non_sync_sample` set) (`floor-cmaf-malformed`); then a sample that does
not last one frame (`duration · num = T · den`), or a segment whose first decode time
is not the frame where the segment before it ended, the first at frame 0
(`dts · num = frame · T · den`) (`floor-cmaf-timing`); then its units, as §7.3 reads a
stream's (`floor-av1-malformed`, a unit's own faults held to the end);
4. then, as §7.3: a unit count other than the source's frames (`floor-frame-count`), and
the faults held back (`floor-av1-malformed`);
5. other than one media segment per piece of the plan, each holding exactly its piece's
frames (`floor-cmaf-pieces`);
6. a key frame §7.3 refuses (`floor-keyframe-mismatch`).
The floor's CMAF files are then the supplied ones, byte for byte: `floor/<f>/init.mp4`
the supplied `init.mp4`, and per piece `floor/<f>/<SHA-256>.m4s` its media segment (§7.6's
writer is not used), which §8.3's playlists and MPDs list. The package also carries the
supplied floor's listing as `floor.listing`: its SHA-256 is `floor.supplied_listing`, which
the policy digest, and so the receipt, binds, and it names each of the ladder's files by
its SHA-256, so the receipt binds the ladder's bytes. A server may hold those files once,
for the ladder and the package alike (by a hard link, or by their content address): they
are the same bytes. The floor objects carry the units as §7.2 frames them, as in the OBU
form.
**7.8** *The floor-only profile.* A component of `profile = "floor-only"` is its floor
rungs alone: no base, no refinement and no source (§3.4 item 8). It is for a library that
delivers its standard-codec renditions as WAI objects, each named by its content hash,
listed in a signed stage index and bound to a signed receipt, without the integer lane.
- *Its pieces* are its first floor rung's: in the CMAF form (§7.7), one piece per media
segment; in the OBU form (§7.3), one piece from each of the stream's shown key frames
to the next, the stream's first unit one (`floor-keyframe-mismatch` otherwise), and the
first floor rung's unit count is the component's frame count. A piece of more than
`max_ms` (§4.4) is refused (`floor-piece-length`); `min_ms` and `target_ms` do not
apply, and the scene-cut segmenter does not run. Every other floor rung is held to those
pieces as §7.3 and §7.7 hold a floor to a plan. A piece's kind is `none` (§6.2), its
flags 0; a rule that states `when.piece_kind` matches none of them, and its moments are
§8.1's.
- *Its objects*: each piece has one floor object per floor rung (§7.1) and nothing else.
A floor object presents no base, so its manifest is §5.2's for its capability with no
`derived_from`, and its entry's flag bit 2 is clear (§6.3); everything else is §7.2's.
Every class lists the floor only (§8.1): no catalog lists a WAI object, the MoQ catalog
is the floors' tracks, and the package has no WAI playlist or MPD.
- *What it attests*: the receipt signs the policy, so the supplied floor's listing, and
the stage index, so every floor object's content hash, length and capability; a
verifier recomputes the dedup counts, holds every object to its hash and to §7.2's
framing, its units to the AV1 stream's structure (temporal units, one per frame,
sequence headers, shown key frames at the piece starts), and the CMAF files to the
units (§7.6) or, in the CMAF form, to the ladder's bytes through `floor.listing`
(§7.7). A sink that checks an object's hash against the index receives the bytes the
signer packed, or refuses them.
- *What it does not attest*: a floor states no tier (§7.4): no decoded-output digest is
stated or checked, so nothing says what a decoder makes of the units; there is no
source, so no `sse` and no fidelity to anything; there is no primary, so no
`replicate` claim; and the pieces are not classified. It attests delivery, not
pictures.
## 8. Classes, catalogs and delivery
**8.1** *What a class lists.* The stages listed for a class are a pure function of the
@ -704,7 +831,8 @@ catalog bytes.
`e_ms > from_ms`. Rule *i* matches it when each condition the rule states holds: its
kind is in `when.piece_kind`, and a tag of a moment it lies in is in
`when.moment_tag`. Matching rules fold in document order (§3.4).
- A floor-only class lists the floor (`0xFF`). Otherwise the class lists
- A floor-only class lists the floor (`0xFF`), and every class lists only the floor of a
piece with no base, a floor-only component's (§7.8). Otherwise the class lists
`min(max_layer, the rules' then.max_layer, the piece's highest layer)`; under
`max_kbps`, while the listed prefix needs more than `max_kbps`, that is
`ceil(8 · bytes · num / (1000 · duration · den))` kilobits per second over the bytes of
@ -737,18 +865,20 @@ second; a variant's `BANDWIDTH` is the largest over the pieces it lists and
`AVERAGE-BANDWIDTH` the rate of all their bytes over all their durations. A floor
variant's bytes per piece are its fragment's; a WAI variant's are the listed bases' and
refinements', over the pieces its HTTP view lists (above). Every playlist
line ends with a line feed. For component *c*, of frame size `W×H`, whose floor has
codecs string *F* and maximum frame size `FW×FH`:
line ends with a line feed. For component *c*, of frame size `W×H`, and each of its
floor rungs, in ladder order, of floor name *f* (§7.1), codecs string *F* and maximum
frame size `FW×FH`:
- `hls/classic/master.m3u8`: `#EXTM3U`, `#EXT-X-VERSION:7`,
`#EXT-X-INDEPENDENT-SEGMENTS`, `#EXT-X-STREAM-INF:BANDWIDTH=<b>,AVERAGE-BANDWIDTH=<a>,CODECS="F",RESOLUTION=FWxFH`,
`../classic/floor-<c>.m3u8`: a URI that names the same playlist from every class's
`#EXT-X-INDEPENDENT-SEGMENTS`, then per floor rung
`#EXT-X-STREAM-INF:BANDWIDTH=<b>,AVERAGE-BANDWIDTH=<a>,CODECS="F",RESOLUTION=FWxFH` and
`../classic/floor-<f>.m3u8`: a URI that names the same playlist from every class's
directory, so each class's master differs from this one only by the session-data
line, as [http-delivery](http-delivery.md) §11.1 and §11.8 require.
- `hls/classic/floor-<c>.m3u8`: `#EXTM3U`, `#EXT-X-VERSION:7`,
- `hls/classic/floor-<f>.m3u8`, per floor rung: `#EXTM3U`, `#EXT-X-VERSION:7`,
`#EXT-X-TARGETDURATION:<t>`, `#EXT-X-MEDIA-SEQUENCE:0`, `#EXT-X-PLAYLIST-TYPE:VOD`,
`#EXT-X-INDEPENDENT-SEGMENTS`, `#EXT-X-MAP:URI="../../floor/<c>/init.mp4"`, then per
piece `#EXTINF:<S.mmm>,` and `../../floor/<c>/<sha256>.m4s`, then `#EXT-X-ENDLIST`.
`#EXT-X-INDEPENDENT-SEGMENTS`, `#EXT-X-MAP:URI="../../floor/<f>/init.mp4"`, then per
piece `#EXTINF:<S.mmm>,` and `../../floor/<f>/<sha256>.m4s`, then `#EXT-X-ENDLIST`.
- `hls/<class>/master.m3u8`: the classical master, byte for byte, with, when the class
lists a WAI object over HTTP, `#EXT-X-SESSION-DATA:DATA-ID="science.transaction.wai.multivariant",VALUE="wai.m3u8"`
after `#EXT-X-INDEPENDENT-SEGMENTS`, and no other change.
@ -759,8 +889,9 @@ codecs string *F* and maximum frame size `FW×FH`:
`#EXT-X-STREAM-INF:BANDWIDTH=<b>,AVERAGE-BANDWIDTH=<a>,CODECS="<union>",X-WAI-FLOOR="<floor>",RESOLUTION=WxH`,
`wai-<c>.m3u8`. The union and the floor are [http-delivery](http-delivery.md) §4.2's
over the objects the class lists.
- `hls/<class>/wai-<c>.m3u8`: the floor playlist's lines without `#EXT-X-MAP`, adjacent
to it ([http-delivery](http-delivery.md) §11.2); per piece, `#EXT-X-GAP` when the
- `hls/<class>/wai-<c>.m3u8`: the first floor rung's playlist's lines without
`#EXT-X-MAP`, adjacent to it ([http-delivery](http-delivery.md) §11.2) and so to every
floor rung's, which list the same pieces; per piece, `#EXT-X-GAP` when the
class's HTTP view lists nothing of it (a floor-only piece, or one whose base is not of
the default base capability), `#EXTINF:<S.mmm>,`, each refinement the class lists,
in entry order, as `#WAI-LAYER:N=<layer>,URI="../../objects/<hash>.wai#n=<byte_len>"`,
@ -778,10 +909,13 @@ over the component's whole duration and its target duration, `<Period id="p0" st
one `AdaptationSet`, `</Period>` and `</MPD>`, indented by two spaces a level:
- `dash/classic.mpd`: `<AdaptationSet id="1" contentType="video" mimeType="video/mp4" codecs="F" width="FW" height="FH" segmentAlignment="true" startWithSAP="1">`
holding `<Representation id="<c>-floor" bandwidth="<b>">` with
`<SegmentList timescale="<num>">`: `<Initialization sourceURL="../floor/<c>/init.mp4"/>`,
holding, per floor rung, `<Representation id="<f>-floor" bandwidth="<b>">` with
`<SegmentList timescale="<num>">`: `<Initialization sourceURL="../floor/<f>/init.mp4"/>`,
a `SegmentTimeline` of one `<S t="<(start − first start)·den>" d="<d·den>"/>` per
piece, and one `<SegmentURL media="../floor/<c>/<sha256>.m4s"/>` per piece.
piece, and one `<SegmentURL media="../floor/<f>/<sha256>.m4s"/>` per piece. With
several floor rungs, the `AdaptationSet` carries no `codecs`, `width` or `height`, and
each `Representation` carries its own after `bandwidth`:
`<Representation id="<f>-floor" bandwidth="<b>" codecs="F" width="FW" height="FH">`.
- `dash/<class>.mpd`, when the class's HTTP view lists a WAI object:
`<AdaptationSet id="1" contentType="video" mimeType="application/wai" codecs="<union>" width="W" height="H">`
holding `<EssentialProperty schemeIdUri="tag:transaction.science,2026:wai/http-delivery"/>`,
@ -819,9 +953,10 @@ does not hold. A sink receives every track a track depends on (moq-streaming-for
§4.1), so a dependency is all of them. A refinement track carries
`wai_delivery_timeout_ms` (§8.6), a catalog field this extension defines under the `wai_`
prefix of moq-streaming-format §4. The base track has `altGroup` 1 when the component has
a floor: the floor is a track `<c>/floor` of `packaging` `"cmaf"`, in the same namespace,
with `altGroup` 1, `renderGroup` 1, `codec`, `width` and `height`, and a sink that
selects the floor subscribes to no layer track. The receipts tracks follow, one per media
a floor: each floor rung's floor, in ladder order, is a track `<f>/floor` for its floor
name *f* (§7.1), of `packaging` `"cmaf"`, in the same namespace, with `altGroup` 1,
`renderGroup` 1, `codec`, `width` and `height`, and a sink that selects a floor
subscribes to no layer track. The receipts tracks follow, one per media
track in its order, each `{"isLive": false, "name": "<name>/receipts", "namespace",
"packaging": "wai-receipts"}`. The catalog passes moq-streaming-format §4.1's check, and a
packager writes no other. A package holds no receipt: the publisher signs each track's
@ -956,7 +1091,8 @@ figure and class that do not cohere, or a legacy label (`receipt-energy`); a sig
that does not verify (`receipt-signature`).
**9.2** Live windows chain by the parent link with parent kind `live-window`. A re-pack
of an earlier package **MAY** name it with parent kind `re-pack`.
of an earlier package **MAY** name it with parent kind `re-pack`, and one that takes its
bases and refinements from it **MUST** (§11.5).
The reference live packer (`wai-pack live`, `wai_pack::live`) takes a source a frame at a
time, cuts it with the segmenter of §4.3, which decides a frame once `lookahead_frames`
@ -1041,23 +1177,28 @@ royalty-free by its standards body"; it is not a freedom-to-operate opinion.
policy.toml policy.json plan-<c>.txt index-<c>.wsix package.receipt.json
objects/<content hash>.wai …
floor/<c>/init.mp4 floor/<c>/<sha256>.m4s …
floor/<f>/init.mp4 floor/<f>/<sha256>.m4s … (per floor rung, of floor name f)
floor.listing (a supplied CMAF floor's listing, §7.7)
hls/classic/… hls/<class>/… dash/… moq/catalog.json stages/<class>.json
claims/<receipt_hash>.measurement.json (a metered package)
LISTING
`policy.toml` is the policy as given; `policy.json` its effective canonical JSON
(§3.2). `LISTING` is the listing (SPEC §3.1) of every other file, and its SHA-256 is the
**pack digest**. A component or class id that cannot be one path segment of a listing,
two class ids equal once `A`–`Z` are mapped to `a`–`z`, and a class named `classic` in
any case (ids name paths, and paths fold case) are refused (`pack-id`).
**pack digest**. A component or class id or a floor name (§7.1) that cannot be one path
segment of a listing, two class ids or two floor names equal once `A`–`Z` are mapped to
`a`–`z`, and a class named `classic` in any case (ids name paths, and paths fold case)
are refused (`pack-id`).
**11.2** *Re-pack equivalence.* Given the same source bytes, effective policy, supplied
floor, signing key and packager identity, a conforming reference packager **MUST**
produce byte-identical package files on every machine, except the energy figure and
measurement claim of a metered package and floor objects §7.5 covers. A verifier
**MAY** pack again and compare listings. A packager whose identity differs is not held
to this.
to this. A re-pack from a parent (§11.5) is held to it with the parent among its inputs;
and where the parent was packed by a conforming packager from the same source under base
and refinement rungs of the same capabilities and parameters, its files are those of a
pack that codes every piece, but for its receipt's parent and so `LISTING`.
**11.3** *Verification.* A verifier of a package, without its sources, applies these
checks in this order and refuses at the first that fails; a check that reads files a
@ -1077,7 +1218,7 @@ failed check names is not applied:
effective canonical JSON, `royalty_free_only` forced on where `policy.json` says
`true` (`policy-json-mismatch`; an override never turns it off, §3.2, so a
`policy.json` that says `false` over a `policy.toml` that says `true` is refused
here); its ids can name files (`pack-id`, §11.1); and under that effective policy it
here); its ids and floor names can name files (`pack-id`, §11.1); and under that effective policy it
asks for nothing a packager may not emit (§3.6's reason; under `royalty_free_only`, a
patent-pool floor is `license-refused`).
5. The receipt's components are the policy's, by id, in order, each of the policy's
@ -1089,18 +1230,20 @@ failed check names is not applied:
class are the component's; its string table is the component's id, the class ids
in policy order, then each capability at its first use; its class records are the
policy's classes, in order, with their `max_layer`, floor-only flag and `max_kbps`;
every piece's kind is one a video piece has; its rules and moments are §8.1's from
every piece's kind is one a video piece has, `none` exactly in a floor-only
component (§7.8); its rules and moments are §8.1's from
its kind and span; its entries are the rungs of its ladder (§5.7), by role,
capability and layer: its base, each refinement in layer order, each floor; each
capability and layer: its base, each refinement in layer order, each floor (a
floor-only component's, its floors alone); each
refinement's deadline is its plan's (§8.6); and its class plan is §8.1's from its
entries;
- the plan file holds the index's starts and its digest is the header's
(`plan-mismatch`);
- every entry's object is present (`object-missing`) and keeps the object rules of
§6.3, its counted bytes included;
- before any frame is decoded, each piece's floor object, where the policy has a floor
rung and the object's payload reads as §7.2's framing, holds one unit per frame of
its piece (`floor-object-mismatch`);
- before any frame is decoded, each piece's floor objects, where the policy has floor
rungs and an object's payload reads as §7.2's framing, hold one unit per frame of
their piece (`floor-object-mismatch`);
- every base and refinement, in entry order: a base decodes by its capability (a
still is a PNG §5.7 reads, its one frame held for the piece), or it is
`prefix-digest`; its manifest is the one §5.2 states for its piece's frames and its
@ -1111,15 +1254,24 @@ failed check names is not applied:
does not apply, ends the check;
- then every decode-equivalent prefix decodes to its `prefix_digest`
(`prefix-digest`);
- when all of that holds, the floor: per piece, one floor object of the floor rung's
capability whose renderer, settings, framing header, unit count and target are
§7.2's (`floor-object-mismatch`) and which presents the piece's base
(`floor-motif-mismatch`); its units each one temporal unit holding a frame, the
first of the first piece carrying a sequence header, every sequence header the
first's bytes, every shown key frame carrying one (`floor-av1-malformed`); each
piece opening on a shown key frame, and no other unit being one unless the policy
allows extra key frames (`floor-keyframe-mismatch`); and the CMAF files are the
ones its temporal units give (§7.6, `floor-cmaf-mismatch`);
- when all of that holds, the floors, floor rung by floor rung in ladder order: per
piece, one floor object per floor rung, the rung's the *k*-th floor entry for the
*k*-th floor rung, of the rung's capability, whose renderer, settings, framing
header, unit count and target are §7.2's (`floor-object-mismatch`) and which
presents the piece's base (`floor-motif-mismatch`), or, in a floor-only component,
which carries no `derived_from` (`floor-object-mismatch`); its units each one temporal unit
holding a frame, the first of the rung's first piece carrying a sequence header,
every sequence header the first's bytes, every shown key frame carrying one
(`floor-av1-malformed`); each piece opening on a shown key frame, and no other unit
being one unless the policy allows extra key frames (`floor-keyframe-mismatch`); and
the rung's CMAF files are the ones its temporal units give (§7.6,
`floor-cmaf-mismatch`); or, for a supplied floor in the CMAF form (§7.7), `floor.listing`
is a listing that hashes to `floor.supplied_listing`, `floor/<f>/init.mp4` is the file
of its line `<f>/init.mp4` and reads as §7.7's initialization segment, and the
listing's media segments of `<f>/`, in its order, are one per piece, piece *k*'s
`floor/<f>/<its SHA-256>.m4s`, reading as §7.7's media segment, opening on a sync
sample, each sample one frame and the first at the piece's start, its samples the
piece's floor units without their temporal delimiters (`floor-cmaf-mismatch`);
- then the catalogs are the ones the index, the objects and the floor give, and an
index no catalog can be written for (a start past `2^53 − 1`) is refused
(`catalog-mismatch`).
@ -1131,7 +1283,9 @@ failed check names is not applied:
**11.4** *What this revision packs.* The reference packager packs one video component:
bases of `wai.video.int_motion` (§5.5, §5.6) and stills of `wai.image.png` (§5.7);
refinements of `wai.video.int_refine` over an `int_motion` base (§5.4); each piece by its
ladder, a rule's ladder subset included (§5.7); and a supplied AV1 floor (§7.3). Its live
ladder, a rule's ladder subset included (§5.7); and a supplied AV1 floor per floor rung,
one or several (§7.1), in the OBU form (§7.3) or the CMAF form (§7.7); and floor-only
components (§7.8). Its live
packer packs the same pieces in windows, without a floor (§9.2). It refuses by name,
before writing anything, what it does not pack yet: another medium
(`pack-media-unsupported`), a floor to encode (`pack-floor-encode-unsupported`), and a rung
@ -1139,33 +1293,79 @@ of a capability it does not encode, or a refinement over a base it does not refi
(`pack-capability-unsupported:<cap>`, every one naming the capability of the rung it does
not pack); and a component with no source (`pack-source-missing`) or whose source's frame
rate is not its timebase (`pack-source-rate`). Where its own work fails it
refuses by name too, and writes nothing: an encode the encoder refuses, such as a piece
refuses by name too, and leaves nothing written (a file it wrote before the refusal is
removed): an encode the encoder refuses, such as a piece
past the samples it holds, or an object it wrote that does not count (`pack-encode`); a
piece past `2^32 − 1` units (`pack-piece-length`); catalogs it cannot write, the case
§11.3 refuses as `catalog-mismatch` (`pack-catalog`); a meter that was asked for and
gives no figure, a span too short to reach a microjoule or a figure past `2^64 − 1`
(`pack-meter`, never an unmetered package in its place); a measurement claim it cannot
write (`pack-measurement-claim`); and a listing it cannot write (`pack-listing`). It
write (`pack-measurement-claim`); a listing it cannot write (`pack-listing`); and a source
that does not read the same twice (`pack-source-changed`) or a supplied floor stream that
does not (`floor-listing-mismatch`): it reads each a frame or a temporal unit at a time,
once to cut and check it and once to code it, and holds neither whole. What it holds is
not a function of the source's length but for a record per piece and per entry and a byte
per frame of each floor (whether it starts at a key frame): the frames of the pieces it
codes at once, which it chooses, each piece coded alone (§4.1), so the package is the same
for any number; one piece of each floor; and, for the catalogs, one object at a time,
read back from where it wrote it. Each file is written whole as it is made. It
writes a package only into a directory that is new or holds nothing, and refuses any
other before it packs (`pack-out-not-empty`): written among another package's files, it
would leave behind the ones it does not write.
**11.5** *Re-pack from a parent.* A packager **MAY** take every piece's base and
refinements from an earlier package, its **parent**, instead of coding them, so a
component's integer base is coded once and taken by every package made from the same
source after it. It reads the source as for a pack that codes (§4: its pieces and their
kinds, §4.3, §4.6, are this source's), and then, before it writes anything, **MUST**
refuse:
1. a parent that does not verify as §11.3 verifies a package (`repack-parent-invalid`,
with the reason the parent fails for);
2. a parent with no component of the component's id, media and timebase, or whose pieces
are not this source's, piece by piece: another number of pieces, or a piece of
another start, duration, flags or kind, or whose ladder (§5.7, under the parent's
policy) codes its base and refinements in rungs of other capabilities or other
parameters (§3.3) than this policy's ladder for the piece, in layer order, or with
another deadline (§8.6) (`repack-parent-mismatch`);
3. a piece whose prefixes, each the parent's base decoded and its refinements applied in
layer order by a staged-delivery §4 sink, do not reconstruct this source with the
`sse` the parent's entry states (§6.6) (`repack-source-mismatch`): a parent packed
from another source.
It then writes, for each piece, the parent's base and refinement objects and their
entries' fields (§6.2: content hash, lengths, capability, role, layer, tier, prefix
digest, `sse`, deadline) in place of coding them, and the floors as it would; its
receipt names the parent's receipt with parent kind `re-pack` (§9.1). A verifier holding
the parent **MAY** check a re-pack against it: the parent verifies
(`repack-parent-invalid`), the re-pack's receipt names the parent's receipt with parent
kind `re-pack`, and each component's pieces are the parent's, piece by piece, of the same
start, duration, kind and flags, whose base and refinement entries are the parent's
entries, every field the same but the entry's place in its index: the entry it refines
counted from its piece's first entry, and the duplicate flag, which an index's own
entries decide (`repack-parent-mismatch`). A re-pack holds no source of its parent's
bases; what binds a reused base to this source is the third check, and what binds it to
the parent is the receipt.
## 12. Reasons
| Reason | Where |
|---|---|
| `policy-toml` (not UTF-8, a byte-order mark, not TOML 1.0, nesting past 32), `policy-float`, `policy-datetime`, `policy-negative`, `policy-integer-range` | §3.2 |
| `policy-unknown-key`, `policy-missing-key`, `policy-type`, `policy-value`, `policy-schema` | §3.3 |
| `policy-too-many-components`, `policy-too-many-rungs`, `policy-too-many-classes`, `policy-too-many-rules`, `policy-too-many-moments`, `policy-duplicate-id`, `policy-lead`, `policy-open-gop`, `policy-piece-bounds`, `policy-ladder-component`, `policy-refines-role`, `policy-dangling-refines`, `policy-refines-cycle`, `policy-refines-base`, `policy-refines-branch`, `policy-no-base`, `policy-class-layer`, `policy-rule-ladder`, `policy-layer-lag`, `policy-too-many-deadlines`, `policy-deadline-unreachable` | §3.4 |
| `policy-too-many-components`, `policy-too-many-rungs`, `policy-too-many-classes`, `policy-too-many-rules`, `policy-too-many-moments`, `policy-duplicate-id`, `policy-lead`, `policy-open-gop`, `policy-piece-bounds`, `policy-ladder-component`, `policy-refines-role`, `policy-dangling-refines`, `policy-refines-cycle`, `policy-refines-base`, `policy-refines-branch`, `policy-no-base`, `policy-floor-only`, `policy-class-layer`, `policy-rule-ladder`, `policy-layer-lag`, `policy-too-many-deadlines`, `policy-deadline-unreachable` | §3.4 |
| `capability-unknown`, `capability-not-payload`, `capability-candidate`, `capability-role`, `license-unclassified`, `license-refused`, each naming the capability (and the licence label) | §3.6 |
| `y4m-header`, `y4m-interlaced`, `y4m-colorspace`, `y4m-size-change`, `y4m-truncated`, `wav-format`, `wav-truncated` | §4.7 |
| `index-magic`, `index-version`, `index-truncated`, `index-reserved`, `index-media-class`, `index-role`, `index-tier`, `index-string`, `index-trailing` | §6.2 |
| `index-timebase`, `window-start`, `piece-order`, `piece-entries`, `piece-kind`, `entry-flags`, `entry-order`, `layer-role`, `refines-outside-window`, `refines-mismatch`, `layer-gap`, `tier-entropy-passthrough`, `tier-weakest`, `tier-mismatch`, `digest-without-tier`, `deadline-role`, `floor-derived-from`, `dup-length`, `dup-flag`, `class-plan`, `class-flags` | §6.3, §6.4 |
| `object-length`, `object-hash`, `non-envelope-entry`, `object-lengths`, `object-capability`, `object-refines`, `object-derived-from` | §6.3 |
| `floor-missing`, `floor-listing-mismatch`, `floor-stream-missing`, `floor-av1-malformed`, `floor-frame-count`, `floor-keyframe-mismatch` | §7.1, §7.3 |
| `floor-stream-missing`, `floor-cmaf-malformed`, `floor-cmaf-timing`, `floor-cmaf-pieces` | §7.7 |
| `floor-keyframe-mismatch`, `floor-piece-length` | §7.8 |
| `floor-object-mismatch`, `floor-motif-mismatch`, `floor-av1-malformed`, `floor-keyframe-mismatch`, `floor-cmaf-mismatch`, against a package | §11.3 |
| `receipt-json`, `receipt-version`, `receipt-index-count`, `receipt-index-digest`, `receipt-stage-root`, `receipt-component`, `receipt-policy-digest`, `receipt-counts`, `receipt-parent-kind`, `receipt-energy`, `receipt-signature` | §9.1 |
| `measurement-claim-missing`, `measurement-claim-invalid` | §9.4 |
| `unexpected-file`, `listing-missing`, `listing-mismatch`, `policy-digest-mismatch`, `policy-json-mismatch`, `policy-component-mismatch`, `index-missing`, `index-policy-mismatch`, `plan-mismatch`, `object-missing`, `object-manifest`, `prefix-digest`, `catalog-mismatch`, `catalog-unexpected`, `object-unlisted` | §11.3 |
| `pack-id`, `pack-source-missing`, `pack-source-rate`, `pack-media-unsupported`, `pack-floor-encode-unsupported`, `pack-capability-unsupported` (naming the capability) | §11.1, §11.4 |
| `pack-encode`, `pack-piece-length`, `pack-catalog`, `pack-meter`, `pack-measurement-claim`, `pack-listing`, `pack-out-not-empty` | §11.4 |
| `pack-encode`, `pack-piece-length`, `pack-catalog`, `pack-meter`, `pack-measurement-claim`, `pack-listing`, `pack-source-changed`, `pack-out-not-empty` | §11.4 |
| `repack-parent-invalid`, `repack-parent-mismatch`, `repack-source-mismatch` | §11.5 |

View file

@ -70,8 +70,26 @@ def blake3(b):
return B3.blake3(b)
# Each object's content hash, computed once: an object resolved many times (resolve_uri,
# once per URI that names it) is hashed once. A caller that has checked an object's hash
# against its own record may seed it (seed_content_hash).
_CONTENT_HASH = {}
def content_hash(env):
return blake3(DOMAIN + env)
h = _CONTENT_HASH.get(env)
if h is None:
h = _CONTENT_HASH[env] = blake3(DOMAIN + env)
return h
def seed_content_hash(env, h):
"""Record an object's content hash that the caller has computed and checked."""
_CONTENT_HASH[env] = h
def forget_content_hashes():
_CONTENT_HASH.clear()
# ------------------------------------------------------------------ the registry
@ -3035,7 +3053,11 @@ def resolve_uri(objs, uri):
name = base.rsplit("/", 1)[-1]
if name.endswith(".wai") and re.fullmatch(r"[0-9a-f]{64}", name[:-4]):
cid = name[:-4]
b = next((b for b in objs.values() if cid is not None and content_hash(b).hex() == cid), None)
# An object held under its own content id is found by name, its hash checked; any
# other by its content hash, each object hashed once (content_hash).
b = objs.get(f"{cid}.wai") if cid is not None else None
if b is None or content_hash(b).hex() != cid:
b = next((b for b in objs.values() if cid is not None and content_hash(b).hex() == cid), None)
if b is None:
raise SystemExit("http_verify: %s names no corpus object" % uri)
return b

View file

@ -57,6 +57,43 @@ packages (§6–§11), and their delivery over a simulated link (§8.9).
written by `supplied_floor.py`. The bumper's base, layers and floor are one object
each; the still's piece is carried over HTTP by the floor (§8.3) and over MoQ on the
base track.
- `packs/video-ladder-01/` — a golden package of two floor rungs over one base (§7.1):
the fixture and base rung of `video-base-01`, so its bases are that package's objects,
and two supplied AV1 streams, `floor/hi.obu` at the fixture's size and `floor/lo.obu`
at half its width and height, each written by `supplied_floor.py` (`--scale lo=2`).
Each piece has its base and one floor object per floor rung; each floor has its own
CMAF files under its floor name (`floor/hi/`, `floor/lo/`), its own floor playlist and
MoQ track, and the classical master, every class's master and `dash/classic.mpd` list
both.
- `packs/video-repack-01/` — a re-pack golden (§11.5): `video-ladder-01`'s policy under
another asset id and its supplied floor, packed with every piece's base taken from the
parent its file `parent` names, `video-base-01`, rather than coded. Its objects are
`video-ladder-01`'s; its receipt names `video-base-01`'s receipt as the package it
re-packs (parent kind `re-pack`); and each piece's base entry is the parent's, field for
field. Both verifiers check it against its parent.
- `packs/video-cmaf-01/` — a golden whose supplied floor is in the CMAF form (§7.7):
`video-ladder-01`'s policy with `floor.supplied_form = "cmaf"`, and its two streams as a
media muxer wrote them, `floor/<name>/init.mp4` and `floor/<name>/seg_<k>.m4s`, one
segment per piece, by `supplied_cmaf.py` (ffmpeg's HLS muxer, `-c copy`). The package's
floor files are those files, byte for byte, under their SHA-256; `floor.listing` is the
supplied floor's listing; and each floor object holds its piece's samples, which are the
OBU form's temporal units of the same streams.
- `cmaf-mutations/` — the CMAF golden altered, in `package-mutations/`'s layout: itself
(`ok`); a segment replaced by one of the same samples, a `free` box before it, under its
own SHA-256; `floor.listing` altered; and without it (each `floor-cmaf-mismatch`).
- `packs/video-floor-only-01/` and `packs/video-floor-only-02/` — floor-only goldens
(§7.8): a component of `profile = "floor-only"` with the ladder's two floor rungs and no
base or source, the floor in the CMAF form (`video-cmaf-01`'s files) and in the OBU form
(`video-ladder-01`'s streams). Their pieces are the first floor's segments or shown key
frames, the ladder golden's plan; each piece is its two floor objects, which carry no
`derived_from` and hold the ladder golden's units, of kind `none`; no class lists a WAI
object.
- `ladder-mutations/` — packages a verifier must refuse or accept (§11.3), each the
ladder golden altered (re-sealed with its key where the receipt or `LISTING` alone
would catch it), in `package-mutations/`'s layout: the golden itself (`ok`); piece 2's
two floor objects swapped (`floor-object-mismatch`); the second floor's CMAF files
under the component's name (`floor-cmaf-mismatch`); and a classical master listing one
floor of two (`catalog-mismatch`).
- `mutations/` — stage indexes, objects and version-2 receipts, and `expected.json`:
each case's reason (§6.2–§6.4, §9.1), a well-formed case of each kind among them,
and three receipts carrying a signature only a verifier that checks the equation
@ -86,7 +123,9 @@ packages (§6–§11), and their delivery over a simulated link (§8.9).
window past 32 KiB, bytes after the zlib stream, and its Adler-32. And one dynamic
block of literals twice: with a lone distance code of one bit, read (the one
incomplete code set the zlib library takes), and of two bits, refused.
- `staged-mutations/` — the staged golden altered and re-sealed with its key, in the
- `staged-mutations/` — the staged golden itself (`ok`: verified without its sources,
every layer's prefix digest held to it), and the staged golden altered and re-sealed
with its key, in the
layout of `package-mutations/`: a refinement on another deadline than its plan's, a
piece missing its top layer, a still where the policy's rule now gives the piece the
default ladder (each `index-policy-mismatch`), a top layer coded again at another step
@ -115,7 +154,10 @@ packages (§6–§11), and their delivery over a simulated link (§8.9).
off among them), a missing or corrupted object, a live window no catalog can be
written for, floor objects that do not open on a key frame or are not §7.2's, files
and directories a strict read finds, and a receipt file that is not its canonical
form; and one the verifier must accept (an extra key frame the policy allows).
form; and those the verifier must accept (an extra key frame the policy allows, and a
metered package, §9.4: the golden re-sealed with a 500 mW model meter over one second
and its measurement claim, every member fixed), with a claim about another figure
(`measurement-claim-invalid`) and none (`measurement-claim-missing`).
The fixtures are not committed. `wai-pack fixture gen <name>` writes each from its
definition (`wai-pack/src/fixture.rs`), every byte an integer function of the frame

View file

@ -0,0 +1,30 @@
{
"pack": "video-cmaf-01",
"cases": [
{
"name": "ok",
"reason": "ok",
"remove": []
},
{
"name": "segment-not-the-supplied-one",
"reason": "floor-cmaf-mismatch",
"remove": [
"floor/hi/14cdbe56c8f57b1427ab9c2a9ebf6669ce8edec06fd7cd0961a01d2aaf720889.m4s",
"hls/classic/floor-hi.m3u8"
]
},
{
"name": "floor-listing-altered",
"reason": "floor-cmaf-mismatch",
"remove": []
},
{
"name": "floor-listing-missing",
"reason": "floor-cmaf-mismatch",
"remove": [
"floor.listing"
]
}
]
}

View file

@ -0,0 +1,47 @@
688cb303ccb16fcdd21c8cb681f936ba813829e71fbf15df0ccb28b04c134447 dash/classic.mpd
a3aa7658db9b85a9d9a1fed977825189f75c5adad0f5fdfcd70ebd604824c138 dash/mobile.mpd
3f520749a6d2f231cddfd17804ee3629439f3678515e424c44e36cff54d89de9 dash/tv.mpd
4e4d6d55b352c17da028bcbf8d314cdd1f9bb1406367008710788665727dcffa floor.listing
14cdbe56c8f57b1427ab9c2a9ebf6669ce8edec06fd7cd0961a01d2aaf720889 floor/hi/14cdbe56c8f57b1427ab9c2a9ebf6669ce8edec06fd7cd0961a01d2aaf720889.m4s
759f476ce9e9b003d7d797060f9c039141d261dd65212035e96bb157783423c1 floor/hi/759f476ce9e9b003d7d797060f9c039141d261dd65212035e96bb157783423c1.m4s
d3616b6368fc800ce421a492fbd0f6263b9e06ee0af1e8269ce4f20d5cb3653d floor/hi/d3616b6368fc800ce421a492fbd0f6263b9e06ee0af1e8269ce4f20d5cb3653d.m4s
e5583297b1456e46366fe3317784fadf8c165c5e16e864629b194dc46290387e floor/hi/e5583297b1456e46366fe3317784fadf8c165c5e16e864629b194dc46290387e.m4s
eb559df9571de1869981ca82672abbabad528b294b15a1d7bf9b635761c584f8 floor/hi/eb559df9571de1869981ca82672abbabad528b294b15a1d7bf9b635761c584f8.m4s
a8a19ef9cd4d540037ef298097bbc5317de6a99690c8c4a745cc867c034208d6 floor/hi/init.mp4
0e0407f5a552e405846a411627df17537e5c31accca37390c391a7c1d27353af floor/lo/0e0407f5a552e405846a411627df17537e5c31accca37390c391a7c1d27353af.m4s
10b19654062fa37b83c082c922f54529725c36a4ead953b1fbfbbee14d4e79a8 floor/lo/10b19654062fa37b83c082c922f54529725c36a4ead953b1fbfbbee14d4e79a8.m4s
2c484c9bead2b261ac1a18c2aedec11761813f995d11dc9779c5f9b039d59b73 floor/lo/2c484c9bead2b261ac1a18c2aedec11761813f995d11dc9779c5f9b039d59b73.m4s
a855b2701af4e7c8c912448be9fc023f911b4e9e94b65770393c4df6d705b5e8 floor/lo/a855b2701af4e7c8c912448be9fc023f911b4e9e94b65770393c4df6d705b5e8.m4s
c29687008dafdf251b2ca962c3e830f785b38a56c81aee1f4c86f2e8f9115fcc floor/lo/c29687008dafdf251b2ca962c3e830f785b38a56c81aee1f4c86f2e8f9115fcc.m4s
6dd501e27365ce9ef90576771aad73de4d200362e6974551847afc3c90604344 floor/lo/init.mp4
ebdc7e40aecbe8b61124ac78f233b0dfaf2a8c5674d3fc9bb023935de1d9b6cb hls/classic/floor-hi.m3u8
66f5eb8b89b80e7da839b23f39665eb85480c6a725fa29d93556efee673c1b9e hls/classic/floor-lo.m3u8
d793737b69231eface4951001e65b3c52cba864f231246a41e64d49c77ebdc97 hls/classic/master.m3u8
d793737b69231eface4951001e65b3c52cba864f231246a41e64d49c77ebdc97 hls/legacy/master.m3u8
8c3b5e2b18192b383c8df8675acd435b861a2585bc6eaf0c09292754f44a8cef hls/mobile/master.m3u8
c4044eca76959c9f87230484a2b207fb12c0bcaedb8d921eab806014fca53cb8 hls/mobile/wai-v.m3u8
60a6378f46afc9308dc4ac4d138602b16568577616ea0bf4526b142d86899151 hls/mobile/wai.m3u8
8c3b5e2b18192b383c8df8675acd435b861a2585bc6eaf0c09292754f44a8cef hls/tv/master.m3u8
ff4edf2929e380d205c1c74156621185feec53d593ffa968b8dfaf0d05448bcd hls/tv/wai-v.m3u8
5d42147b308330913c3d9c8a868ca83ce4d3f3e460da8d84c84014eb24aaf9d7 hls/tv/wai.m3u8
649330bcfaaee54f802f6b4ddf6e459daca8bb0e8df86c87a9d6bd0d65cd09ea index-v.wsix
68f00abff5ef19f074d510f8cce4592afc2a1d4981a87663965a46dc8bcbe1d3 moq/catalog.json
9f381e2ab764b5e14770b00503c1c90b9c22ba22f87464b2869a70644af11939 objects/08797901ff55d0bb4afba5cffe95df64b7e216f3a0c9ba82006133bb9b6d7f16.wai
07e98fb9ef9ff3fa6bf04f9078da2a3d2423e586feea1061256131a1d1fbb943 objects/24761a434c91c627f11abd6265371966b50573602a200dd7bb04e0d90889326d.wai
d5f9cdd996920e07339b79093b9e4e5cb4237f1780f268220cc6f89c79aea90a objects/399048a078b0f2983149266a44eaf207cfa63f490212b69389fba4d72f62c60f.wai
cfb71256ef44758ea279846a8938823994d321abce83ef73afd2ed269a8e0259 objects/618e0a89be8c7e556b380326b219c2f6fbfc5a0cb97754e871c1c23a99bdb481.wai
f3eedf9eb2870c0160801397412e7a4c3aca4a6e16f1a69a276e1356d38c9220 objects/61c7c3b7ccab07ed01df5b0d7ca0240598b914dbf2cabe545aa001e8de12d365.wai
d03f0813c266294f84483cfe4db177d094c06b95ab3a8471d6b2ec53401f05a7 objects/a236e9070d10fd09342cafdbf6973edd35e5266cf850fe2f38f77536ac803912.wai
2316616549f7f92dc29e34fe656c332c9f4a1e20f4be26396976407acc792ba4 objects/a3ae43406f9966487b6c5f5a4d56e9dca50c327423fcfd2a98f4c342d1dbfaf9.wai
b2a40a9a8cec3dcaf6c92a07d6765203c412c57ec879b7e33a52eabb2e74609d objects/c2ce1907255a041c388afd06ccd007436368e8d20467fdec2a1eebbb84b03bf2.wai
6d665f1bef3784cbb428abc28724f74fa83c8f2bc812828621c93c5514b6dc0e objects/c5253efe2949669bb9df01d9f60c01f2570ba4be1c0af26105e092dfccf90d30.wai
0acecba00acc28e313805189fd826ad3a9fab1fe69727ef2d5999fc543426289 objects/c81171fa53998cfe94207ad66ab9b53cfbd4b3f058730e62512ca9f0f6ef2ea3.wai
f3bd9cbe3c2518c997a4d1d3a32145a04f55ef53e0b5760a6ce6aa5e14fe06a7 objects/dea0f6415f639fca99d91a0341aba164078a1bd4780e21d72cbf2234928272ec.wai
d22c4f8ac8a5de43bbec6be04ea8b6da72f2bd133f8f57a31607362670178c68 objects/f467872fe8d3cd1f60f832c997cc14fd00abbf601c61286a612089b4a53a195a.wai
f1f4e32ba9f76e36431d97e0fd52b9025075f553bf6b9f63c484d60573c8ea90 package.receipt.json
517630d9bee1f5559baff3bb3e642f6aa7b5276226f6e3bdba4f3f9724794859 plan-v.txt
428e24f9e1c62fc5590ce3d3a6239a5c274dcfc1391a2ea2abe8dc0562da7d20 policy.json
9d2b4c15ac17ee074f646d0b1ed11ef56557f633ff67a3e6a6d0eb4dd1596548 policy.toml
2f5807b891b8eb0a44b76c4303487be1dcf19e111f06f6c642e14b81c85d7c4d stages/legacy.json
8695fff48ca86321c5198e3a8cf660ccba208df4f40fd1907e76c64a52674cf5 stages/mobile.json
6ae56077cfc368a59489233eeee6ee7fd97437821822637ac62096ab93c85286 stages/tv.json

View file

@ -0,0 +1,12 @@
a8a19ef9cd4d540037ef298097bbc5317de6a99690c8c4a745cc867c034208d6 hi/init.mp4
14cdbe56c8f57b1427ab9c2a9ebf6669ce8edec06fd7cd0961a01d2aaf720889 hi/seg_0000.m4s
e5583297b1456e46366fe3317784fadf8c165c5e16e864629b194dc46290387e hi/seg_0001.m4s
d3616b6368fc800ce421a492fbd0f6263b9e06ee0af1e8269ce4f20d5cb3653d hi/seg_0002.m4s
eb559df9571de1869981ca82672abbabad528b294b15a1d7bf9b635761c584f8 hi/seg_0003.m4s
759f476ce9e9b003d7d797060f9c039141d261dd65212035e96bb157783423c1 hi/seg_0004.m4s
6dd501e27365ce9ef90576771aad73de4d200362e6974551847afc3c90604344 lo/init.mp4
0e0407f5a552e405846a411627df17537e5c31accca37390c391a7c1d27353af lo/seg_0000.m4s
c29687008dafdf251b2ca962c3e830f785b38a56c81aee1f4c86f2e8f9115fcc lo/seg_0001.m4s
10b19654062fa37b83c082c922f54529725c36a4ead953b1fbfbbee14d4e79a8 lo/seg_0002.m4s
a855b2701af4e7c8c912448be9fc023f911b4e9e94b65770393c4df6d705b5e8 lo/seg_0003.m4s
20484c9bead2b261ac1a18c2aedec11761813f995d11dc9779c5f9b039d59b73 lo/seg_0004.m4s

View file

@ -0,0 +1,46 @@
688cb303ccb16fcdd21c8cb681f936ba813829e71fbf15df0ccb28b04c134447 dash/classic.mpd
a3aa7658db9b85a9d9a1fed977825189f75c5adad0f5fdfcd70ebd604824c138 dash/mobile.mpd
3f520749a6d2f231cddfd17804ee3629439f3678515e424c44e36cff54d89de9 dash/tv.mpd
14cdbe56c8f57b1427ab9c2a9ebf6669ce8edec06fd7cd0961a01d2aaf720889 floor/hi/14cdbe56c8f57b1427ab9c2a9ebf6669ce8edec06fd7cd0961a01d2aaf720889.m4s
759f476ce9e9b003d7d797060f9c039141d261dd65212035e96bb157783423c1 floor/hi/759f476ce9e9b003d7d797060f9c039141d261dd65212035e96bb157783423c1.m4s
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@ -0,0 +1,46 @@
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<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:full:2011" type="static" mediaPresentationDuration="PT8.000S" minBufferTime="PT3S">
<Period id="p0" start="PT0S">
<AdaptationSet id="1" contentType="video" mimeType="video/mp4" codecs="av01.0.00M.08" width="32" height="18" segmentAlignment="true" startWithSAP="1">
<Representation id="lo-floor" bandwidth="8152">
<SegmentList timescale="25">
<Initialization sourceURL="../floor/lo/init.mp4"/>
<SegmentTimeline>
<S t="0" d="60"/>
<S t="60" d="25"/>
<S t="85" d="50"/>
<S t="135" d="25"/>
<S t="160" d="40"/>
</SegmentTimeline>
<SegmentURL media="../floor/lo/0e0407f5a552e405846a411627df17537e5c31accca37390c391a7c1d27353af.m4s"/>
<SegmentURL media="../floor/lo/c29687008dafdf251b2ca962c3e830f785b38a56c81aee1f4c86f2e8f9115fcc.m4s"/>
<SegmentURL media="../floor/lo/10b19654062fa37b83c082c922f54529725c36a4ead953b1fbfbbee14d4e79a8.m4s"/>
<SegmentURL media="../floor/lo/a855b2701af4e7c8c912448be9fc023f911b4e9e94b65770393c4df6d705b5e8.m4s"/>
<SegmentURL media="../floor/lo/2c484c9bead2b261ac1a18c2aedec11761813f995d11dc9779c5f9b039d59b73.m4s"/>
</SegmentList>
</Representation>
</AdaptationSet>
</Period>
</MPD>

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@ -0,0 +1,5 @@
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-STREAM-INF:BANDWIDTH=8152,AVERAGE-BANDWIDTH=7583,CODECS="av01.0.00M.08",RESOLUTION=32x18
../classic/floor-lo.m3u8

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@ -0,0 +1,5 @@
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-STREAM-INF:BANDWIDTH=8152,AVERAGE-BANDWIDTH=7583,CODECS="av01.0.00M.08",RESOLUTION=32x18
../classic/floor-lo.m3u8

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@ -0,0 +1,6 @@
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-SESSION-DATA:DATA-ID="science.transaction.wai.multivariant",VALUE="wai.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=8152,AVERAGE-BANDWIDTH=7583,CODECS="av01.0.00M.08",RESOLUTION=32x18
../classic/floor-lo.m3u8

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@ -0,0 +1,6 @@
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-SESSION-DATA:DATA-ID="science.transaction.wai.multivariant",VALUE="wai.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=8152,AVERAGE-BANDWIDTH=7583,CODECS="av01.0.00M.08",RESOLUTION=32x18
../classic/floor-lo.m3u8

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@ -0,0 +1 @@
{"tracks":[{"altGroup":1,"isLive":false,"name":"v/l0","namespace":"video-cmaf-01","packaging":"wai","renderGroup":1,"role":"video","wai_capabilities":["wai.video.int_motion"],"wai_determinism":"decode-equivalence","wai_receipt_alias":2923025889890445,"wai_receipts":true,"wai_receipts_track":"v/l0/receipts","wai_staged":{"layer":0,"lead_ms":null,"set":"v"}},{"altGroup":1,"codec":"av01.0.00M.08","height":18,"name":"lo/floor","namespace":"video-cmaf-01","packaging":"cmaf","renderGroup":1,"width":32},{"isLive":false,"name":"v/l0/receipts","namespace":"video-cmaf-01","packaging":"wai-receipts"}],"version":1}

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@ -0,0 +1,148 @@
#!/usr/bin/env python3
"""The supplied CMAF reader differentially (extensions/packaging.md §7.7): wai-pack's
(`wai-pack cmaf-verdict`) against pack_verify.py's, which shares no code with it, on
seeded alterations of real files. The files are the CMAF golden's floor (a media muxer's
initialization and media segments, packs/video-cmaf-01/floor/) and §7.6's writer's (the
ladder golden's package, packs/video-ladder-01/package/floor/). Each case alters the
initialization segment or one media segment: a byte flipped in its first boxes, a 32-bit
field overwritten at a box boundary, the file cut short, a box's size changed, a box
inserted at the top level or in a moof, the init's timescale or edit list altered, or a
segment's moof and mdat repeated. Every verdict (ok, floor-cmaf-malformed or
floor-cmaf-timing), and for an accepted segment its samples (offset, length, duration,
flags, decode time), must agree, and no reader may panic.
python3 cmaf_diff.py <wai-pack binary> <seed> <cases>
"""
import hashlib
import os
import random
import subprocess
import sys
import tempfile
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
import pack_verify as PV # noqa: E402
def py_init(b):
try:
return "ok", PV.cmaf_init(b)
except PV.CmafFault as x:
return x.code, None
except Exception as x: # a reader must refuse, never fail otherwise
return f"CRASH {type(x).__name__}", None
def py_segment(b, init):
try:
s = PV.cmaf_segment(b, init)
except PV.CmafFault as x:
return (x.code, 0, "-")
except Exception as x:
return (f"CRASH {type(x).__name__}", 0, "-")
text = "".join(f"{a},{n},{d},{f},{t};" for a, n, d, f, t in s)
return ("ok", len(s), hashlib.sha256(text.encode()).hexdigest())
def boxes(b, start, end):
try:
return PV.bmff_boxes(b, start, end)
except PV.CmafFault:
return []
def alter(rng, b):
b = bytearray(b)
top = boxes(b, 0, len(b))
k = rng.randrange(8)
if k == 6:
# The times: an init's timescale or its edit list's media time, at their offsets.
for kind, off in ((b"mdhd", 20), (b"elst", 20), (b"elst", 16)):
at = bytes(b).find(kind)
if at >= 0 and rng.random() < 0.5 and at + off + 4 <= len(b):
b[at + off:at + off + 4] = rng.choice([0, 1, 2, rng.randrange(1 << 32)]).to_bytes(4, "big")
return bytes(b)
k = 0
if k == 7:
# A media segment's moof and mdat repeated: the second's decode time is the first's.
pairs = [i for i, x in enumerate(top) if x[0] == b"moof" and i + 1 < len(top) and top[i + 1][0] == b"mdat"]
if pairs:
i = rng.choice(pairs)
b += b[top[i][1]:top[i + 1][3]]
return bytes(b)
k = 0
if k == 0 and b:
b[rng.randrange(min(len(b), 400))] ^= 1 << rng.randrange(8)
elif k == 1 and top:
x = rng.choice(top)
inner = boxes(b, x[2], x[3]) if x[0] in (b"moov", b"moof", b"trak", b"traf", b"mdia", b"minf", b"stbl", b"mvex") else []
y = rng.choice(inner) if inner and rng.random() < 0.7 else x
at = y[1] + rng.choice([8, 12, 16, 20, 24])
if at + 4 <= len(b):
b[at:at + 4] = rng.choice([0, 1, 7, 0xFFFFFFFF, rng.randrange(1 << 32)]).to_bytes(4, "big")
elif k == 2 and len(b) > 8:
del b[rng.randrange(8, len(b)):]
elif k == 3 and top:
x = rng.choice(top)
b[x[1]:x[1] + 4] = max(0, (x[3] - x[1]) + rng.choice([-9, -1, 1, 4, 8, -(x[3] - x[1])])).to_bytes(4, "big")
elif k == 4 and top:
kind = rng.choice([b"free", b"skip", b"uuid", b"styp", b"mdat", b"moof"])
box = (8 + 4).to_bytes(4, "big") + kind + bytes(4)
at = rng.choice([x[1] for x in top] + [len(b)])
b[at:at] = box
elif top:
moofs = [x for x in top if x[0] == b"moof"]
if moofs:
x = rng.choice(moofs)
inner = boxes(b, x[2], x[3])
at = rng.choice([y[1] for y in inner] + [x[3]])
kind = rng.choice([b"sbgp", b"free", b"tfdt", b"trun"])
box = (8 + 8).to_bytes(4, "big") + kind + bytes(8)
b[at:at] = box
b[x[1]:x[1] + 4] = (x[3] - x[1] + len(box)).to_bytes(4, "big")
return bytes(b)
def main(argv):
if len(argv) != 4:
print(__doc__)
return 2
wai_pack, seed, n = argv[1], int(argv[2]), int(argv[3])
rng = random.Random(seed)
root = os.path.join(HERE, "packs")
sets = []
for d in (os.path.join(root, "video-cmaf-01", "floor", "hi"), os.path.join(root, "video-cmaf-01", "floor", "lo"),
os.path.join(root, "video-ladder-01", "package", "floor", "hi")):
names = sorted(os.listdir(d))
sets.append((PV.load(os.path.join(d, "init.mp4")), [PV.load(os.path.join(d, x)) for x in names if x.endswith(".m4s")]))
bad, seen = 0, {}
with tempfile.TemporaryDirectory() as tmp:
for c in range(n):
init, segs = rng.choice(sets)
seg = rng.choice(segs)
if rng.random() < 0.25:
init = alter(rng, init)
else:
seg = alter(rng, seg)
ip, sp = os.path.join(tmp, "init.mp4"), os.path.join(tmp, "seg.m4s")
open(ip, "wb").write(init)
open(sp, "wb").write(seg)
out = subprocess.run([wai_pack, "cmaf-verdict", ip, sp], capture_output=True, text=True).stdout.splitlines()
iv, pi = py_init(init)
want = [f"init\t{iv}"]
if iv == "ok":
v = py_segment(seg, pi)
want.append(f"{sp}\t{v[0]}\t{v[1]}\t{v[2]}")
verdict = want[-1].split("\t")[1]
seen[verdict] = seen.get(verdict, 0) + 1
if out != want or any("PANIC" in x or "CRASH" in x for x in out + want):
bad += 1
if bad <= 10:
print(f"case {c}: wai-pack {out}, pack_verify {want}")
print(f"cmaf_diff: {n - bad}/{n} cases agree; verdicts {dict(sorted(seen.items()))}")
return 0 if bad == 0 else 1
if __name__ == "__main__":
sys.exit(main(sys.argv))

View file

@ -0,0 +1,35 @@
{
"pack": "video-ladder-01",
"cases": [
{
"name": "ok",
"reason": "ok",
"remove": []
},
{
"name": "floors-swapped",
"reason": "floor-object-mismatch",
"remove": [
"floor/hi/2f93f0ad449f9cc881b7816c6ab33fd445037d6538b445bcc76431f9c9f91c5b.m4s",
"floor/lo/acd166807d05fe4f512407f717659d88613f6d0d360485effe3751504cefbb74.m4s"
]
},
{
"name": "floor-under-the-component-s-name",
"reason": "floor-cmaf-mismatch",
"remove": [
"floor/lo/589ad79210bff258db68916876846a2b0d530ea2e44260af66ddc51ad14ce07f.m4s",
"floor/lo/6bba50408f894d0e9d5516a53992fdd2aa86db43ccdc684b69c51a688856a0db.m4s",
"floor/lo/acd166807d05fe4f512407f717659d88613f6d0d360485effe3751504cefbb74.m4s",
"floor/lo/d0f68eb18af5b67736ddccd97ed45c4c0274b0460f6abc8f54940ac378165833.m4s",
"floor/lo/d550ebb204adf0b5a7f310c7d07189e7bed63e12e34e9ed4d9bf96a101d864a9.m4s",
"floor/lo/init.mp4"
]
},
{
"name": "master-lists-one-floor",
"reason": "catalog-mismatch",
"remove": []
}
]
}

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@ -0,0 +1,46 @@
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@ -0,0 +1,41 @@
<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:full:2011" type="static" mediaPresentationDuration="PT8.000S" minBufferTime="PT3S">
<Period id="p0" start="PT0S">
<AdaptationSet id="1" contentType="video" mimeType="video/mp4" segmentAlignment="true" startWithSAP="1">
<Representation id="hi-floor" bandwidth="10440" codecs="av01.0.00M.08" width="64" height="36">
<SegmentList timescale="25">
<Initialization sourceURL="../floor/hi/init.mp4"/>
<SegmentTimeline>
<S t="0" d="60"/>
<S t="60" d="25"/>
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</SegmentTimeline>
<SegmentURL media="../floor/hi/420ae4c941bba6e12a6c7fdb7d01dc69170ecb4240dffd2e86808ddf87baa12a.m4s"/>
<SegmentURL media="../floor/hi/04c948608aaa7b5d78ad5355042a2ff65b0f75d9d4b1ad78f3ebffb886a74be6.m4s"/>
<SegmentURL media="../floor/hi/acd166807d05fe4f512407f717659d88613f6d0d360485effe3751504cefbb74.m4s"/>
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</Representation>
<Representation id="lo-floor" bandwidth="9600" codecs="av01.0.00M.08" width="32" height="18">
<SegmentList timescale="25">
<Initialization sourceURL="../floor/lo/init.mp4"/>
<SegmentTimeline>
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</SegmentTimeline>
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</AdaptationSet>
</Period>
</MPD>

View file

@ -0,0 +1,18 @@
#EXTM3U
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#EXT-X-TARGETDURATION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-INDEPENDENT-SEGMENTS
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#EXTINF:2.400,
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#EXTINF:1.000,
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#EXTINF:2.000,
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#EXTINF:1.000,
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#EXTINF:1.600,
../../floor/hi/576b7d2156c2b595bf48bf34f67996d7f89e75d105f0dc71c9841bb96e6cd0fc.m4s
#EXT-X-ENDLIST

View file

@ -0,0 +1,18 @@
#EXTM3U
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#EXT-X-MEDIA-SEQUENCE:0
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#EXT-X-MAP:URI="../../floor/lo/init.mp4"
#EXTINF:2.400,
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#EXTINF:1.000,
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#EXTINF:2.000,
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#EXTINF:1.000,
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#EXTINF:1.600,
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#EXT-X-ENDLIST

View file

@ -0,0 +1,7 @@
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-STREAM-INF:BANDWIDTH=10440,AVERAGE-BANDWIDTH=8903,CODECS="av01.0.00M.08",RESOLUTION=64x36
../classic/floor-hi.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=9600,AVERAGE-BANDWIDTH=8875,CODECS="av01.0.00M.08",RESOLUTION=32x18
../classic/floor-lo.m3u8

View file

@ -0,0 +1,7 @@
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-STREAM-INF:BANDWIDTH=10440,AVERAGE-BANDWIDTH=8903,CODECS="av01.0.00M.08",RESOLUTION=64x36
../classic/floor-hi.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=9600,AVERAGE-BANDWIDTH=8875,CODECS="av01.0.00M.08",RESOLUTION=32x18
../classic/floor-lo.m3u8

View file

@ -0,0 +1,8 @@
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-SESSION-DATA:DATA-ID="science.transaction.wai.multivariant",VALUE="wai.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=10440,AVERAGE-BANDWIDTH=8903,CODECS="av01.0.00M.08",RESOLUTION=64x36
../classic/floor-hi.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=9600,AVERAGE-BANDWIDTH=8875,CODECS="av01.0.00M.08",RESOLUTION=32x18
../classic/floor-lo.m3u8

View file

@ -0,0 +1,8 @@
#EXTM3U
#EXT-X-VERSION:7
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-SESSION-DATA:DATA-ID="science.transaction.wai.multivariant",VALUE="wai.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=10440,AVERAGE-BANDWIDTH=8903,CODECS="av01.0.00M.08",RESOLUTION=64x36
../classic/floor-hi.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=9600,AVERAGE-BANDWIDTH=8875,CODECS="av01.0.00M.08",RESOLUTION=32x18
../classic/floor-lo.m3u8

View file

@ -0,0 +1 @@
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View file

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View file

@ -0,0 +1,5 @@
#EXTM3U
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#EXT-X-STREAM-INF:BANDWIDTH=10440,AVERAGE-BANDWIDTH=9055,CODECS="av01.0.00M.08",RESOLUTION=64x36
../classic/floor-hi.m3u8

View file

@ -96,6 +96,24 @@
"index": "index/floor-without-derived-from.wsix",
"reason": "floor-derived-from"
},
{
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},
{
"name": "entry-flag-unknown",
"kind": "index",

File diff suppressed because it is too large Load diff

View file

@ -282,6 +282,21 @@
"reason": "receipt-json",
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{
"name": "empty-directory",
"reason": "unexpected-file",

View file

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