enricobuehler
d25a20a233
Every AV1 frame either decode rung has ever been measured against is `tile_cols = tile_rows = 1`. The vendored vector is single-tile on all 274 of its frames, so every tile array the conversions fill — `tiles.widths`, `tiles.heights`, the per-tile records — had only ever been written at index 0, and a conversion that wrote tile 0 and left the rest zero would pass the whole suite. Our encoder splits 4K into TWO TILE ROWS. **The fixture.** `lowdelay-3840x2160.ivf.av1`, 261 KB, 60 frames — `punktfunk-host spike --source synthetic --codec av1 --width 3840 --height 2160 --fps 60 --seconds 1 --bitrate 1` on .21 (NVENC, RTX 5070 Ti), wrapped to IVF with `ffmpeg -f obu … -c copy` so `common::split_av1_aus` (the vendored parser's own `IvfIterator`) frames it exactly as it frames the vector, with no second splitter that could disagree. **4K is not a size choice, it is the only shape with the property.** Measured on the same box with the same command: 1280x720, 1920x1080 and 2560x1440 all give `tile_cols = tile_rows = 1`; 3840x2160 gives `tile_cols = 1, tile_rows = 2` with `width_in_sbs_minus_1 = [59]`, `height_in_sbs_minus_1 = [16, 16]`, and both tiles in ONE Tile Group OBU. 60 frames instead of 120 pays for the resolution: 261 KB, under both the 282 KB H.264 and 270 KB H.265 low-delay fixtures. Goldens are libavcodec's software decode, cross-checked between ffmpeg n8.1.2 (Arch x86_64, libdav1d) and 8.1.1 (Homebrew, macOS arm64, libdav1d) whose 746,496,000-byte raw outputs are BYTE-IDENTICAL, not merely equal per frame. 60 of 60 digests distinct. **AV1's frame accounting is asserted, never derived.** The vendored vector is 250 temporal units carrying 274 coded frames of which 24 are hidden; this stream is 60 units, 60 coded, 60 shown, 0 hidden, 0 `show_existing_frame`, 1 key frame. Neither is the general case, so both parity harnesses now take units / decoded / shown as three independent parameters instead of computing one from another, and the CPU guard states all six numbers. **A CPU gate that needed no hardware at all.** `pic_av1`'s new `a_two_tile_frame_fills_both_row_entries_and_leaves_the_rest_zero` pins the second row entry against its OWN `height_in_sbs_minus_1`, requires the two rows to tile the frame exactly, and requires TWO tile RECORDS out of ONE tile group with rows (0,0) and (1,0) — the transposition a square grid could never reveal — each spanning real bytes. The existing one-tile test asserts index 0 is right and `1..` are zero, which a broken multi-tile conversion also satisfies. ⚠⚠ **This is a file, and on AV1 that distinction has already cost a release.** "250/250 delivered frames bit-identical to libavcodec" was true for the entire period the host was shipping only the FIRST TILE of every 4K frame: the verification ran against a vendored file while the truncation lived in packetisation, and the suite stayed green throughout. This fixture closes the multi-tile gap on the DECODE rungs and closes nothing about fragmentation, reassembly, loss or AU boundaries — the golden header, both module docs and the leg docs all say so, at length, so the next reader does not inherit the same false confidence. Legs: `low_delay_host_av1_every_frame_hashes_bit_identical_to_libavcodec` on the Vulkan rung (11 ignored legs now) and on the D3D11VA rung, plus two non-ignored CPU tests. Verified: 11/11 Vulkan parity legs on .21 (RTX 5070 Ti, 610.57.04), the new one 60/60 bit-identical; workspace clippy `-D warnings` and `cargo fmt --all --check` clean on .21.
127 lines
7.8 KiB
Plaintext
127 lines
7.8 KiB
Plaintext
# SHA-256 per DELIVERED frame of lowdelay-3840x2160.ivf.av1, DISPLAY order — 60 frames.
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#
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# Each frame is the 3840x2160 render region as tightly packed NV12:
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# Y plane 3840*2160 bytes, then interleaved UV 3840*1080 bytes = 12441600 bytes/frame.
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# (`render_width`/`render_height` equal the frame size, so there is no crop.)
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#
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# THE STREAM IS OURS, not a conformance vector, and that is the point of it.
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# `punktfunk-host spike` on .21 (NVENC, RTX 5070 Ti, driver 610.57.04,
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# punktfunk-host 0.25.0-0.00011708), 2026-08-07:
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#
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# punktfunk-host spike --source synthetic --codec av1 --width 3840 --height 2160 \
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# --fps 60 --seconds 1 --bitrate 1 --no-loopback --out lowdelay-3840x2160.av1
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# ffmpeg -f obu -i lowdelay-3840x2160.av1 -c copy -f ivf lowdelay-3840x2160.ivf.av1
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#
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# The spike writes the low-overhead OBU stream; the IVF wrapper is added so this file
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# is framed exactly like the vendored vector and `common::split_av1_aus` — the
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# vendored parser's own `IvfIterator` — splits it with no second implementation that
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# could disagree. `-c copy` re-frames, it does not re-encode.
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#
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# ⭐ WHY 4K, when every other fixture here is chosen to be small. It is the ONLY
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# resolution at which our encoder emits more than one tile. Measured on the same box,
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# same command, 2026-08-07: 1280x720, 1920x1080 and 2560x1440 all give
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# `tile_cols = tile_rows = 1`; 3840x2160 gives `tile_cols = 1, tile_rows = 2` —
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# `width_in_sbs_minus_1 = [59]`, `height_in_sbs_minus_1 = [16, 16]` — and BOTH tiles
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# ride in ONE Tile Group OBU (`tg_start = 0, tg_end = 1`). That is the exact shape
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# behind the defect where the host shipped only the first tile of every 4K frame, and
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# a single-tile fixture cannot express it at all.
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#
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# 60 frames rather than 120 to pay for it: one second at 60 fps is 261 KB, which is
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# SMALLER than the 282 KB H.264 and 270 KB H.265 low-delay fixtures, and still leaves
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# 55 of the 60 access units exercising the reference-slot pressure below.
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#
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# 60 = 60 = 60, and that is itself worth pinning. Unlike the vendored vector (250
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# temporal units carrying 274 coded frames, 24 of them hidden), THIS stream is one
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# coded frame per temporal unit, all shown: 60 units, 60 coded frames, 60 displayed,
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# one KEY frame, zero hidden, zero `show_existing_frame`. The parity legs' frame
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# accounting must not silently assume either shape, so the CPU guard asserts all of
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# these numbers rather than deriving one from another.
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#
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# Main 4:2:0 8-bit (`seq_profile = 0`, `high_bitdepth = 0`, `mono_chrome = 0`) and NO
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# FILM GRAIN, so the Vulkan decode profile is the grain-DISABLED one, exactly as for
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# the vendored vector — see that file's header for why grain is a profile property
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# rather than a per-frame toggle.
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#
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# ⚠ WHAT THIS FIXTURE DOES NOT COVER. It is a FILE, and a file is not the wire path.
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# The headline "250/250 delivered frames bit-identical to libavcodec" was true for AV1
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# the entire time the host was shipping only the first tile of every 4K frame: that
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# verification ran against a vendored file, the packetisation and reassembly it never
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# touched were where the frames were being truncated, and the suite stayed green. This
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# fixture closes a different gap — it is the first pixel evidence for AV1 from our own
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# encoder, in a multi-tile shape — and it closes NOTHING about fragmentation,
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# reassembly, loss or the session's AU boundaries. Those need an end-to-end test.
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#
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# Goldens from libavcodec's SOFTWARE decoder (AV1 decoding is exactly specified, so
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# every conformant decoder is bit-identical):
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#
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# ffmpeg -i lowdelay-3840x2160.ivf.av1 -f rawvideo -pix_fmt nv12 \
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# -fps_mode passthrough ref.yuv
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# # then split ref.yuv into 12441600-byte frames and sha256 each
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#
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# CROSS-CHECKED between two independent builds on two architectures whose
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# 746,496,000-byte raw outputs are BYTE-IDENTICAL (not merely equal per frame):
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# sha256 90c5be20342cba4d80bd0ceb1568cc3e2037f427d34c658895c7742968c93600 from both
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# ffmpeg n8.1.2 (Arch/CachyOS, gcc 16, x86_64, libdav1d)
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# ffmpeg 8.1.1 (Homebrew, clang, macOS arm64, libdav1d)
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# 60 of 60 digests distinct.
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