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A broadcast chain holds AC-3 and E-AC-3, and a channel offers its audio in several languages and with audio description; WAI could name neither, nor say how the renditions are offered. SPEC §5 registers wai.audio.ac3 (AC-3 syncframes back to back, ATSC A/52:2018 §5, ETSI TS 102 366) and wai.audio.eac3 (an E-AC-3 bit stream, A/52 Annex E), sink-supplied and carried unread, of the class proprietary: one licensor still runs the programme, and the reported expiry of their essential patents is not confirmed by it (research/media-codec-registry.md, ¹⁸). Their replicate class is standard-unclassified: A/52 §7.3.4 lets a decoder dither zero-bit mantissas with any reasonably random sequence. The glossary links them, media-identify names ac3 and eac3, and live-ingest maps `ac-3`, `ec-3` and stream types 0x81 and 0x87 to them; the reference gateway does not carry them in this revision. packaging §8.10 writes a set of audio rendition entries (main, alternate, dub, commentary and audio description, in AAC, Opus, FLAC, AC-3 or E-AC-3) as HLS EXT-X-MEDIA tags of type AUDIO (draft-pantos-hls-rfc8216bis-22) and DASH audio adaptation sets with ETSI TS 103 285 V1.4.1 §6.1.2's roles and audio-purpose descriptor. An audio description is a broadcast mix bound to its access-services description record, which must verify and be in its language; it is marked describes-video, machine-generated when its voice is synthesized, and named in X-WAI-DESCRIPTION and a DASH SupplementalProperty. The writer refuses what the HLS text forbids or asks against: a name twice in a group, two defaults, two renditions chosen unasked that cannot be told apart, groups that do not offer the same renditions. The reference is the audio_renditions module of wai-rs; the corpus is pack-conformance/renditions/ (31 cases), with renditions_verify.py its second implementation: every case agrees, 9 of 9 mutated copies fail and 15 of 15 weakened verifiers are caught. Eleven faults planted in the reference (AC-3 royalty-free, E-AC-3 exact, eac3 unmapped in identify, the codecs rule, the description's language, autoselect, the DASH role, the groups rule, the machine label, the description's rules, the default rule) each fail its tests. Co-Authored-By: Claude Opus 5.5 <[email protected]>
23 lines
1.5 KiB
Shell
23 lines
1.5 KiB
Shell
# step: audio renditions · wai-rs and renditions_verify.py
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# order: 554
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# features: audio_renditions
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# paths: wai/extensions/packaging.md
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# independent: audio-renditions delivery python3 -I pack-conformance/renditions_verify.py pack-conformance/renditions
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#
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# Audio renditions (extensions/packaging.md §8.10): the reference module's unit tests (a main and
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# a dub written, and every rule refusing) and the corpus's (it reaches every stated outcome, and
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# a changed outcome fails), and tests/audio_renditions.rs (vectors.json regenerates byte for
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# byte, wai-rs gives every case its stated outcome, and §8.10.6 lists exactly the reference's
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# codes); and, in the step of every independent verifier above, the corpus's second
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# implementation, renditions_verify.py, written from the extension's text and sharing no code
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# with wai-rs, which reads description records with access_services_verify.py, writes the HLS
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# tags and DASH adaptation sets itself, reads §8.10.6, requires every mutated copy of the
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# corpus to fail and drops each of its own checks in turn; standard library only, run
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# isolated (-I).
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#
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# The paths this step brings to the workflow's trigger, and why:
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# wai/extensions/packaging.md: tests/audio_renditions.rs requires §8.10.6 to list the
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# reference's codes, and renditions_verify.py reads it.
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set -euo pipefail
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(cd wai-rs && cargo test --no-default-features --features "$WAI_FEATURES" --lib -- audio_renditions::)
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(cd wai-rs && cargo test --no-default-features --features "$WAI_FEATURES" --test audio_renditions)
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