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platform-decode §6 makes the zeroth-condition wai.video.av1 rendition, as the platform decodes it, a base of the residual refinement layers. A stream every sequence header of which has film_grain_params_present 0 decodes to the decoding process's frames on every conforming decoder; a page shows its WebCodecs decoder conforming with a probe (published SHA-256 of each frame's I420 samples), and the base's RGB8 units are the frames by the JFIF conversion in 16-bit fixed point, so layers written once against the reference decode reach the same stage hashes natively and in a page. A stream with film grain anywhere is refused as a base before it is decoded. SPEC §5's Base admission admits wai.video.av1 under wai.video.int_refine only where the base step holds decode-equivalence (codecs::admission_needs_exact_base); staged-delivery §5 and §6.1 give that base step its tier and units; browser-sink §4.1 and §4.4 say what the probe is for, and change no route. wai-rs gains staged::av1 (with libdav1d under av1_base), platform_decode::av1_stream and the grain flag; wai-web gains StageBase.fromAv1, av1Base and av1Probe and a page that decodes through WebCodecs. The corpus platform-decode-conformance/grain-free-av1/ holds the stream, its reference decode and probe, two layers, a stream with film grain and seven cases, checked by wai_av1_refine_vectors, tests/av1_refine.rs, verify.py (second implementation), the wasm32 replay and the page. Co-Authored-By: Claude Opus 5.5 <[email protected]>
632 lines
19 KiB
JSON
632 lines
19 KiB
JSON
{
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"about": "platform-decode §6: a grain-free wai.video.av1 base and two wai.video.int_refine layers written against its reference decode, and a stream with film grain. A case makes the base from base.i420 (the frames a decoder gave, I420, concatenated) as its decoder states: reference (libdav1d) or probe-matched at decode-equivalence, unprobed at none (staged::av1::base_from_i420); the sink is staged::StageSink with a hold bound of 16 envelopes and 1000 ms, no cost limit, a chain budget of 2^30 and a record budget of 2^20; step i (from 0) offers its envelope at i + 1 ms with no receipt verified, and expire@t expires holds at t ms. expect states the base's refusal, every step's reports (applied, held and refused units by index), and each unit's stage, producer (a file name), tier and stage hash (SHA-256 of its RGB8 buffer, null below decode-equivalence), and the clip hash.",
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"name": "one-layer",
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"name": "two-layers",
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