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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]>
22 lines
1.4 KiB
JSON
22 lines
1.4 KiB
JSON
{
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"about": "platform-decode §6.2: the decode-equivalence probe of base.wai, a grain-free wai.video.av1 stream. Each frame's sha256 is over its decoded samples as WebCodecs copyTo() writes them with no format, rect or layout option, I420: the luma plane, then Cb, then Cr, rows tightly packed (browser-sink §4.4); a frame a decoder outputs as NV12 is compared after its chroma plane is split. clip_sha256 is the SHA-256 of the frames' digests concatenated in output order (SPEC §7, Digests). Written from the reference decode (libdav1d) of the stream.",
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"envelope": "base.wai",
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"capability": "wai.video.av1",
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"codec": "av01.0.31M.08",
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"codedWidth": 160,
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"codedHeight": 96,
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"frames": 8,
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"film_grain_params_present": false,
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"format": "I420",
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"frame_sha256": [
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"96460a5f0640ec0872a90c8577ec140cbe1e496fdfd1e8754201aa7b8f0ab850",
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"41c2499b828d849a3c7ae09919027c7400146bb6b856952e477b2e9ff4486b16",
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"b45d5d8cb71bc0a0417d9872c82dc7f0d8e50aa7a6714551b1e8264327a524ee",
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"e54c10d3a5e419f3c04e8ccac8175c91c9c9357b33414314d7abec4e182c62de",
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"e9cc7b3b58009476a584df6889bc745c1e7bafb9aacad311445dbb88ac24de39",
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"661222be88e417195c43977a722addd3e8c270062b66ba3c19e5ae32d071c366",
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"ed333596bdbb0ec1ca0779e6c43295a594e0cd6577a066647f8856aedeb7c788",
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"d645cea78e610c2b300c2833d8b433c7d3fe56abd280535afc850ef80d85656a"
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],
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"clip_sha256": "540b5f16a44514328002129185f384d17612c781d72dea62452b468af08af709"
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}
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