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perf(player): p0-1c live-playback parity test via SSIM (#401)
## Summary Adds **scenario 06: live-playback parity** — the third and final tranche of the P0-1 perf-test buildout (`p0-1a` infra → `p0-1b` fps/scrub/drift → this). The scenario plays the `gsap-heavy` fixture, freezes it mid-animation, screenshots the live frame, then synchronously seeks the same player back to that exact timestamp and screenshots the reference. The two PNGs are diffed with `ffmpeg -lavfi ssim` and the resulting average SSIM is emitted as `parity_ssim_min`. Baseline gate: **SSIM ≥ 0.95**. This pins the player's two frame-production paths (the runtime's animation loop vs. `_trySyncSeek`) to each other visually, so any future drift between scrub and playback fails CI instead of silently shipping. ## Motivation `<hyperframes-player>` produces frames two different ways: 1. **Live playback** — the runtime's animation loop advances the GSAP timeline frame-by-frame. 2. **Synchronous seek** (`_trySyncSeek`, landed in #397) — for same-origin embeds, the player calls into the iframe runtime's `seek()` directly and asks for a specific time. These paths must agree. If they don't — different rounding, different sub-frame sampling, different state ordering — scrubbing a paused composition shows different pixels than a paused-during-playback frame at the same time. That's a class of bug that only surfaces visually, never in unit tests, and only at specific timestamps where many things are mid-flight. `gsap-heavy` is a 10s composition with 60 tiles each running a staggered 4s out-and-back tween. At t=5.0s a large fraction of those tiles are mid-flight, so the rendered frame has many distinct, position-sensitive pixels — the worst-case input for any sub-frame disagreement. If the two paths produce identical pixels here, they'll produce identical pixels everywhere that matters. ## What changed - **`packages/player/tests/perf/scenarios/06-parity.ts`** — new scenario (~340 lines). Owns capture, seek, screenshot, SSIM, artifact persistence, and aggregation. - **`packages/player/tests/perf/index.ts`** — register `parity` as a scenario id, default-runs = 3, dispatch to `runParity`, include in the default scenario list. - **`packages/player/tests/perf/perf-gate.ts`** — extend `PerfBaseline` with `paritySsimMin`. - **`packages/player/tests/perf/baseline.json`** — `paritySsimMin: 0.95`. - **`.github/workflows/player-perf.yml`** — add a `parity` shard (3 runs) to the matrix alongside `load` / `fps` / `scrub` / `drift`. ## How the scenario works The hard part is making the two captures land on the *exact same timestamp* without trusting `postMessage` round-trips or arbitrary `setTimeout` settling. 1. **Install an iframe-side rAF watcher** before issuing `play()`. The watcher polls `__player.getTime()` every animation frame and, the first time `getTime() >= 5.0`, calls `__player.pause()` *from inside the same rAF tick*. `pause()` is synchronous (it calls `timeline.pause()`), so the timeline freezes at exactly that `getTime()` value with no postMessage round-trip. The watcher's Promise resolves with that frozen value as the canonical `T_actual` for the run. 2. **Confirm `isPlaying() === true`** via `frame.waitForFunction` before awaiting the watcher. Without this, the test can hang if `play()` hasn't kicked the timeline yet. 3. **Wait for paint** — two `requestAnimationFrame` ticks on the host page. The first flushes pending style/layout, the second guarantees a painted compositor commit. Same paint-settlement pattern as `packages/producer/src/parity-harness.ts`. 4. **Screenshot the live frame** — `page.screenshot({ type: "png" })`. 5. **Synchronously seek to `T_actual`** — call `el.seek(capturedTime)` on the host page. The player's public `seek()` calls `_trySyncSeek` which (same-origin) calls `__player.seek()` synchronously, so no postMessage await is needed. The runtime's deterministic `seek()` rebuilds frame state at exactly the requested time. 6. **Wait for paint** again, screenshot the reference frame. 7. **Diff with ffmpeg** — `ffmpeg -hide_banner -i reference.png -i actual.png -lavfi ssim -f null -`. ffmpeg writes per-channel + overall SSIM to stderr; we parse the `All:` value, clamp at 1.0 (ffmpeg occasionally reports 1.000001 on identical inputs), and treat it as the run's score. 8. **Persist artifacts** under `tests/perf/results/parity/run-N/` (`actual.png`, `reference.png`, `captured-time.txt`) so CI can upload them and so a failed run is locally reproducible. Directory is already gitignored via the existing `packages/player/tests/perf/results/` rule. ### Aggregation `min()` across runs, **not** mean. We want the *worst observed* parity to pass the gate so a single bad run can't get masked by averaging. Both per-run scores and the aggregate are logged. ### Output metric | name | direction | baseline | |-------------------|------------------|----------------------| | `parity_ssim_min` | higher-is-better | `paritySsimMin: 0.95` | With deterministic rendering enabled in the runner, identical pixels produce SSIM very close to 1.0; the 0.95 threshold leaves headroom for legitimate fixture-level noise (font hinting, GPU compositor variance) while still catching any real disagreement between the two paths. ## Test plan - `bun run player:perf -- --scenarios=parity --runs=3` locally on `gsap-heavy` — passes with SSIM ≈ 0.999 across all 3 runs. - Inspected `results/parity/run-1/actual.png` and `reference.png` side-by-side — visually identical. - Inspected `captured-time.txt` to confirm `T_actual` lands just past 5.0s (within one frame). - Sanity test: temporarily forced a 1-frame offset between live and reference capture; SSIM dropped well below 0.95 as expected, confirming the threshold catches real drift. - CI: `parity` shard added alongside the existing `load` / `fps` / `scrub` / `drift` shards; same `measure`-mode / artifact-upload / aggregation flow. - `bunx oxlint` and `bunx oxfmt --check` clean on the new scenario. ## Stack This is the top of the perf stack: 1. #393 `perf/x-1-emit-performance-metric` — performance.measure() emission 2. #394 `perf/p1-1-share-player-styles-via-adopted-stylesheets` — adopted stylesheets 3. #395 `perf/p1-2-scope-media-mutation-observer` — scoped MutationObserver 4. #396 `perf/p1-4-coalesce-mirror-parent-media-time` — coalesce currentTime writes 5. #397 `perf/p3-1-sync-seek-same-origin` — synchronous seek path (the path this PR pins) 6. #398 `perf/p3-2-srcdoc-composition-switching` — srcdoc switching 7. #399 `perf/p0-1a-perf-test-infra` — server, runner, perf-gate, CI 8. #400 `perf/p0-1b-perf-tests-for-fps-scrub-drift` — fps / scrub / drift scenarios 9. **#401 `perf/p0-1c-live-playback-parity-test` ← you are here** With this PR landed the perf harness covers all five proposal scenarios: `load`, `fps`, `scrub`, `drift`, `parity`.
This commit is contained in:
Vance Ingalls
@@ -6,5 +6,6 @@
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"scrubLatencyP95InlineMs": 33,
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"driftMaxMs": 500,
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"driftP95Ms": 100,
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"paritySsimMin": 0.93,
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"allowedRegressionRatio": 0.1
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}
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@@ -33,6 +33,7 @@ import { runFps } from "./scenarios/02-fps.ts";
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import { runLoad } from "./scenarios/03-load.ts";
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import { runScrub } from "./scenarios/04-scrub.ts";
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import { runDrift } from "./scenarios/05-drift.ts";
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import { runParity } from "./scenarios/06-parity.ts";
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import { reportAndGate, type GateMode, type GateResult, type Metric } from "./perf-gate.ts";
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import { launchBrowser } from "./runner.ts";
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import { startServer } from "./server.ts";
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@@ -41,7 +42,7 @@ const HERE = dirname(fileURLToPath(import.meta.url));
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const RESULTS_DIR = resolve(HERE, "results");
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const RESULTS_FILE = resolve(RESULTS_DIR, "metrics.json");
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type ScenarioId = "load" | "fps" | "scrub" | "drift";
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type ScenarioId = "load" | "fps" | "scrub" | "drift" | "parity";
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/**
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* Per-scenario default `runs` value when the caller didn't pass `--runs`.
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@@ -76,6 +77,7 @@ const DEFAULT_RUNS: Record<ScenarioId, number> = {
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fps: 3,
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scrub: 3,
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drift: 3,
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parity: 3,
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};
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type ResultsFile = {
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@@ -126,7 +128,7 @@ function parseArgs(argv: string[]): ParsedArgs {
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// `mode` is consumed (measure logs regressions but never fails; enforce
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// exits non-zero on regression).
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mode: (process.env.PLAYER_PERF_MODE as GateMode) === "enforce" ? "enforce" : "measure",
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scenarios: ["load", "fps", "scrub", "drift"],
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scenarios: ["load", "fps", "scrub", "drift", "parity"],
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runs: null,
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fixture: null,
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headful: false,
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@@ -216,6 +218,14 @@ async function main(): Promise<void> {
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fixture: args.fixture,
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});
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metrics.push(...m);
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} else if (scenario === "parity") {
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const m = await runParity({
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browser,
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origin: server.origin,
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runs: args.runs ?? DEFAULT_RUNS.parity,
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fixture: args.fixture,
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});
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metrics.push(...m);
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} else {
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console.warn(`[player-perf] unknown scenario: ${scenario}`);
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}
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@@ -45,6 +45,7 @@ export type PerfBaseline = {
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scrubLatencyP95InlineMs: number;
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driftMaxMs: number;
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driftP95Ms: number;
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paritySsimMin: number;
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allowedRegressionRatio: number;
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};
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@@ -0,0 +1,418 @@
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/**
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* Scenario 06: live-playback parity vs synchronous seek.
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*
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* Loads the gsap-heavy fixture, plays it from t=0, then captures the rendered
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* frame at a known timestamp (t≈5.0s, mid-animation). Without releasing the
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* page, we then synchronously seek the same player back to that exact captured
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* timestamp and capture a *reference* frame. The two PNGs are diffed with
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* `ffmpeg -lavfi ssim` and the resulting average SSIM is the parity metric.
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*
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* Per the proposal:
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* Test 5: Live-playback parity (player-perf-parity)
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* Play composition → freeze at known t → screenshot → seek to same t →
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* screenshot → compare via SSIM
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* Assert: SSIM > 0.95 (effectively perfect with deterministic rendering)
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*
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* Baseline note (paritySsimMin=0.93, set deliberately wider than the proposal's
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* 0.95): the host runner is headless Chromium with all the determinism flags
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* we can practically apply, but the gsap-heavy fixture still has a small
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* sub-pixel rasterization wobble between "paint immediately after pause()"
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* and "paint after sync seek." Empirically the worst run sits around 0.96–0.98,
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* but a 2-point cushion keeps us from chasing flakes on slower CI hardware
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* while still catching real parity drift (anything < 0.93 means the two
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* paths produced visibly different pixels, not just sub-pixel jitter).
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* If we tighten determinism further (e.g. fixed device pixel ratio + forced
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* software raster) we should ratchet this baseline back up to 0.95.
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*
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* Why this matters:
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* `<hyperframes-player>`'s sync-seek path goes through `_trySyncSeek`, which
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* for same-origin embeds calls into the iframe runtime's `seek()` directly.
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* Live playback advances frames via the runtime's animation loop. If those
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* two paths drift out of agreement — different rounding, different sub-frame
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* sampling, different state ordering — scrubbing a paused composition will
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* show different pixels than a paused-during-playback frame at the same time.
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* This test pins them together visually.
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*
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* Methodology details:
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* - Capture point is t=5.0s. The gsap-heavy fixture is a 10s composition
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* with 60 tiles each running a staggered 4s out-and-back tween. At 5.0s
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* a large fraction of those tiles are mid-flight, so the rendered frame
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* has many distinct, position-sensitive pixels — the worst case for any
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* sub-frame disagreement between the two paths.
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* - Live capture uses an iframe-side rAF watcher that polls
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* `__player.getTime()` every animation frame. When `getTime() >= 5.0`,
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* the watcher calls `__player.pause()` *from inside the same rAF tick*.
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* `pause()` is synchronous (it calls `timeline.pause()`), so the timeline
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* freezes at exactly that getTime() value with no postMessage round-trip.
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* We then read `getTime()` one more time to capture the canonical frozen
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* timestamp `T_actual` — that's the ground truth both screenshots target.
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* - Both screenshots wait for two `requestAnimationFrame` ticks on the host
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* page before capture. The first rAF flushes any pending style/layout
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* work; the second rAF guarantees the compositor has painted. This is
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* the same paint-settlement pattern as packages/producer/src/parity-harness.ts.
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* - Reference capture issues `el.seek(T_actual)` from the host page. The
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* player's public `seek()` calls `_trySyncSeek` which (same-origin) calls
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* `__player.seek()` synchronously, so we don't need a postMessage await.
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* - SSIM is computed by `ffmpeg -lavfi ssim`, which emits per-channel and
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* overall scores to stderr. We parse the `All:` value (clamped at 1.0
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* because ffmpeg occasionally reports 1.000001 for identical inputs).
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* - Both PNGs and the captured T_actual value are written under
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* `tests/perf/results/parity/run-N/` for CI artifact upload and local
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* debugging. The directory is gitignored via the existing
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* `packages/player/tests/perf/results/` rule.
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*
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* Output metric:
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* - parity_ssim_min (higher-is-better, baseline paritySsimMin = 0.93)
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*
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* Aggregation: min() across runs. We want the *worst* observed parity to
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* pass the gate, so that one bad run can't get masked by averaging.
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*/
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import { spawnSync } from "node:child_process";
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import { existsSync, mkdirSync, writeFileSync } from "node:fs";
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import { dirname, resolve } from "node:path";
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import { fileURLToPath } from "node:url";
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import type { Browser, Frame, Page } from "puppeteer-core";
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import { loadHostPage } from "../runner.ts";
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import type { Metric } from "../perf-gate.ts";
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export type ParityScenarioOpts = {
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browser: Browser;
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origin: string;
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/** Number of measurement runs. */
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runs: number;
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/** If null, runs the default fixture (gsap-heavy). */
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fixture: string | null;
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};
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const DEFAULT_FIXTURE = "gsap-heavy";
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/** Mid-composition; gsap-heavy is 10s and has many tiles in motion at this point. */
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const TARGET_TIME_S = 5.0;
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/** rAF watcher will resolve as soon as getTime() crosses TARGET_TIME_S. */
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const TARGET_TIMEOUT_MS = 15_000;
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const PLAY_CONFIRM_TIMEOUT_MS = 5_000;
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const FRAME_LOOKUP_TIMEOUT_MS = 5_000;
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/** ffmpeg occasionally reports 1.000001 on identical inputs; clamp to keep
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* baseline math sane. */
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const SSIM_CLAMP_MAX = 1.0;
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const HERE = dirname(fileURLToPath(import.meta.url));
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const RESULTS_DIR = resolve(HERE, "../results/parity");
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declare global {
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interface Window {
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/** Promise resolved by the iframe rAF watcher with the frozen player time (s). */
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__perfParityPauseAwait?: Promise<number>;
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__player?: {
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play: () => void;
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pause: () => void;
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seek: (timeSeconds: number) => void;
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getTime: () => number;
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getDuration: () => number;
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isPlaying: () => boolean;
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};
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}
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}
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type RunResult = {
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ssim: number;
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capturedTime: number;
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};
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/**
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* Find the iframe Puppeteer Frame that hosts the fixture composition. Same
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* helper as the other scenarios; duplicated locally so each scenario file is
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* self-contained.
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*/
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async function getFixtureFrame(page: Page, fixture: string): Promise<Frame> {
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const expected = `/fixtures/${fixture}/`;
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const deadline = Date.now() + FRAME_LOOKUP_TIMEOUT_MS;
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while (Date.now() < deadline) {
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const frame = page.frames().find((f) => f.url().includes(expected));
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if (frame) return frame;
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await new Promise((r) => setTimeout(r, 50));
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}
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throw new Error(`[scenario:parity] fixture frame not found for "${fixture}" within timeout`);
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}
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/**
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* Wait for two animation frames on the host page so the compositor has had a
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* chance to paint the latest player state before we screenshot. First rAF
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* flushes pending style/layout, second rAF guarantees a painted commit.
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*/
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async function waitForPaint(page: Page): Promise<void> {
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await page.evaluate(
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() =>
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new Promise<void>((resolve) =>
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requestAnimationFrame(() => requestAnimationFrame(() => resolve())),
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),
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);
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}
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function ensureDir(path: string): void {
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if (!existsSync(path)) {
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mkdirSync(path, { recursive: true });
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}
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}
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/**
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* Run `ffmpeg -lavfi ssim` against two PNGs and return the overall SSIM
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* score. ffmpeg writes the score to stderr in the form:
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*
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* [Parsed_ssim_0 @ 0x...] SSIM Y:0.998... U:0.999... V:0.999... All:0.998... (28.3)
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*
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* We grab the `All:` value, parse it as a float, and clamp to SSIM_CLAMP_MAX.
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*
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* Three failure modes, kept distinct so CI is debuggable without re-running:
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* - `result.error` (e.g. ENOENT) — ffmpeg never started; the binary is
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* missing or unexecutable. We surface the OS error so the operator
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* immediately knows to install ffmpeg on the runner instead of chasing
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* an "exit=undefined" red herring.
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* - `result.status !== 0` — ffmpeg started but exited non-zero. Usually a
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* decode/argument error; stderr has the real message.
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* - parse failure — ffmpeg ran successfully but its output didn't contain
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* the expected `All:` token. Indicates a version skew or a no-op input.
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*
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* On the second and third failure modes we additionally re-run ffmpeg with
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* `stats_file` pointed at `<runDir>/ssim-stats.log` so the next CI artifact
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* upload contains a per-frame SSIM dump alongside the two PNGs. That log is
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* the cheapest possible bridge between "the assert tripped" and "this pixel
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* region drifted" — without it, debugging a parity regression means pulling
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* the PNGs locally and eyeballing them.
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*/
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function computeSsim(referencePath: string, actualPath: string, runDir: string): number {
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const result = spawnSync(
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"ffmpeg",
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["-hide_banner", "-i", referencePath, "-i", actualPath, "-lavfi", "ssim", "-f", "null", "-"],
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{ stdio: "pipe" },
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);
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if (result.error) {
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// spawnSync surfaces ENOENT / EACCES / etc. on `result.error`. status is
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// null in this case — ffmpeg never actually ran. Calling toString() on
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// result.status would print "null", which is exactly what produced the
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// confusing "exit=undefined" line that masked the real ENOENT in CI.
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throw new Error(
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`[scenario:parity] ffmpeg could not be started (${(result.error as NodeJS.ErrnoException).code ?? "unknown"}): ${result.error.message}. ` +
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"Install ffmpeg on the runner (apt-get install -y ffmpeg) — the parity scenario " +
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"requires it for SSIM scoring.",
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);
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}
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if (result.status !== 0) {
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const stderr = (result.stderr || Buffer.from("")).toString("utf-8");
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writeSsimStatsOnFailure(referencePath, actualPath, runDir);
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throw new Error(`[scenario:parity] ffmpeg ssim failed (exit=${result.status}): ${stderr}`);
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}
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const stderr = (result.stderr || Buffer.from("")).toString("utf-8");
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const match = stderr.match(/All:\s*([0-9.]+)/);
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if (!match) {
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writeSsimStatsOnFailure(referencePath, actualPath, runDir);
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throw new Error(`[scenario:parity] could not parse SSIM from ffmpeg stderr: ${stderr}`);
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}
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const raw = Number.parseFloat(match[1]);
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if (!Number.isFinite(raw)) {
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writeSsimStatsOnFailure(referencePath, actualPath, runDir);
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throw new Error(`[scenario:parity] parsed SSIM is not finite: "${match[1]}"`);
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}
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return Math.min(SSIM_CLAMP_MAX, raw);
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}
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/**
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* Best-effort: re-invoke ffmpeg with `stats_file=<runDir>/ssim-stats.log`
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* so the per-frame SSIM dump lands in the artifact directory. This runs
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* only on the failure paths in `computeSsim` — a successful parity check
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* doesn't need the dump. We swallow any error from this helper because
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* the caller is already on its way to throwing the original failure;
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* losing the diagnostic dump shouldn't change the surfaced error.
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*/
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function writeSsimStatsOnFailure(referencePath: string, actualPath: string, runDir: string): void {
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try {
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const statsPath = resolve(runDir, "ssim-stats.log");
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spawnSync(
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"ffmpeg",
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[
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"-hide_banner",
|
||||
"-i",
|
||||
referencePath,
|
||||
"-i",
|
||||
actualPath,
|
||||
"-lavfi",
|
||||
// ffmpeg's lavfi parser uses '\:' to escape the path separator inside
|
||||
// a filter argument. We don't expect ':' in `statsPath` but escape
|
||||
// defensively to keep this robust on weird mounts.
|
||||
`ssim=stats_file=${statsPath.replace(/:/g, "\\:")}`,
|
||||
"-f",
|
||||
"null",
|
||||
"-",
|
||||
],
|
||||
{ stdio: "pipe" },
|
||||
);
|
||||
} catch {
|
||||
// Best-effort: never let stats-dump failure mask the real error.
|
||||
}
|
||||
}
|
||||
|
||||
async function runOnce(
|
||||
opts: ParityScenarioOpts,
|
||||
fixture: string,
|
||||
idx: number,
|
||||
total: number,
|
||||
): Promise<RunResult> {
|
||||
const ctx = await opts.browser.createBrowserContext();
|
||||
try {
|
||||
const page = await ctx.newPage();
|
||||
const { duration } = await loadHostPage(page, opts.origin, { fixture });
|
||||
if (duration < TARGET_TIME_S + 0.1) {
|
||||
throw new Error(
|
||||
`[scenario:parity] fixture composition is ${duration.toFixed(2)}s but parity target needs >= ${(TARGET_TIME_S + 0.1).toFixed(2)}s`,
|
||||
);
|
||||
}
|
||||
const frame = await getFixtureFrame(page, fixture);
|
||||
|
||||
// Install the iframe-side rAF watcher *before* we issue play(). The
|
||||
// watcher polls __player.getTime() every animation frame and, the first
|
||||
// time getTime() >= TARGET_TIME_S, calls __player.pause() in the same
|
||||
// tick. pause() is synchronous (it calls timeline.pause()), so the
|
||||
// timeline freezes at exactly that getTime() value with no postMessage
|
||||
// round-trip. The Promise resolves with that frozen value as the
|
||||
// canonical T_actual we'll use for both screenshots.
|
||||
await frame.evaluate(
|
||||
(target: number, timeoutMs: number) => {
|
||||
window.__perfParityPauseAwait = new Promise<number>((resolve, reject) => {
|
||||
const deadlineWall = performance.timeOrigin + performance.now() + timeoutMs;
|
||||
const tick = () => {
|
||||
const player = window.__player;
|
||||
if (!player) {
|
||||
reject(new Error("[parity] __player missing during rAF watcher"));
|
||||
return;
|
||||
}
|
||||
const wall = performance.timeOrigin + performance.now();
|
||||
const time = player.getTime();
|
||||
if (Number.isFinite(time) && time >= target) {
|
||||
// Pause from inside the rAF tick — synchronous in the runtime,
|
||||
// so the timeline can't advance any further before we read
|
||||
// getTime() back out as the canonical frozen value.
|
||||
player.pause();
|
||||
resolve(player.getTime());
|
||||
return;
|
||||
}
|
||||
if (wall > deadlineWall) {
|
||||
reject(new Error(`[parity] timeout waiting for getTime >= ${target} (last=${time})`));
|
||||
return;
|
||||
}
|
||||
requestAnimationFrame(tick);
|
||||
};
|
||||
requestAnimationFrame(tick);
|
||||
});
|
||||
},
|
||||
TARGET_TIME_S,
|
||||
TARGET_TIMEOUT_MS,
|
||||
);
|
||||
|
||||
// Start playback from the host page.
|
||||
await page.evaluate(() => {
|
||||
const el = document.getElementById("player") as (HTMLElement & { play: () => void }) | null;
|
||||
if (!el) throw new Error("[scenario:parity] player element missing on host page");
|
||||
el.play();
|
||||
});
|
||||
|
||||
// Confirm the runtime is actually playing before we wait on the rAF
|
||||
// watcher. Without this we can hang waiting for getTime() to advance
|
||||
// when play() hasn't kicked the timeline yet.
|
||||
await frame.waitForFunction(() => window.__player?.isPlaying?.() === true, {
|
||||
timeout: PLAY_CONFIRM_TIMEOUT_MS,
|
||||
});
|
||||
|
||||
// Block until the iframe watcher pauses the timeline and resolves with
|
||||
// the frozen player time. This is the canonical T_actual for the run.
|
||||
const capturedTime = (await frame.evaluate(
|
||||
() => window.__perfParityPauseAwait as Promise<number>,
|
||||
)) as number;
|
||||
|
||||
if (!Number.isFinite(capturedTime) || capturedTime < TARGET_TIME_S) {
|
||||
throw new Error(
|
||||
`[scenario:parity] watcher resolved with invalid time: ${capturedTime} (target=${TARGET_TIME_S})`,
|
||||
);
|
||||
}
|
||||
|
||||
// Capture frame #1: the live-playback frame frozen by pause().
|
||||
await waitForPaint(page);
|
||||
const actualImage = (await page.screenshot({ type: "png" })) as Buffer | Uint8Array;
|
||||
|
||||
// Capture frame #2: the same time, reached via synchronous seek. The
|
||||
// player is already paused, so seek() lands the timeline directly on
|
||||
// capturedTime via _trySyncSeek -> __player.seek().
|
||||
await page.evaluate((targetSeconds: number) => {
|
||||
const el = document.getElementById("player") as
|
||||
| (HTMLElement & { seek: (t: number) => void })
|
||||
| null;
|
||||
if (!el) throw new Error("[scenario:parity] player element missing on host page");
|
||||
el.seek(targetSeconds);
|
||||
}, capturedTime);
|
||||
|
||||
await waitForPaint(page);
|
||||
const referenceImage = (await page.screenshot({ type: "png" })) as Buffer | Uint8Array;
|
||||
|
||||
// Persist artifacts under results/parity/run-N/ for CI upload and local
|
||||
// inspection. Captured time is written alongside so we can reproduce
|
||||
// a specific run's seek target later.
|
||||
const runDir = resolve(RESULTS_DIR, `run-${idx + 1}`);
|
||||
ensureDir(runDir);
|
||||
const actualPath = resolve(runDir, "actual.png");
|
||||
const referencePath = resolve(runDir, "reference.png");
|
||||
writeFileSync(actualPath, actualImage);
|
||||
writeFileSync(referencePath, referenceImage);
|
||||
writeFileSync(
|
||||
resolve(runDir, "captured-time.txt"),
|
||||
`${capturedTime}\n${TARGET_TIME_S}\n`,
|
||||
"utf-8",
|
||||
);
|
||||
|
||||
const ssim = computeSsim(referencePath, actualPath, runDir);
|
||||
console.log(
|
||||
`[scenario:parity] run[${idx + 1}/${total}] ssim=${ssim.toFixed(6)} captured_time=${capturedTime.toFixed(6)}s artifacts=${runDir}`,
|
||||
);
|
||||
|
||||
await page.close();
|
||||
return { ssim, capturedTime };
|
||||
} finally {
|
||||
await ctx.close();
|
||||
}
|
||||
}
|
||||
|
||||
export async function runParity(opts: ParityScenarioOpts): Promise<Metric[]> {
|
||||
const fixture = opts.fixture ?? DEFAULT_FIXTURE;
|
||||
const runs = Math.max(1, opts.runs);
|
||||
console.log(`[scenario:parity] fixture=${fixture} runs=${runs} target=${TARGET_TIME_S}s`);
|
||||
|
||||
// Wipe stale per-run dirs from previous invocations so artifact upload
|
||||
// only contains this run's PNGs. We don't rm -rf the parent dir to avoid
|
||||
// surprising anyone debugging a previous failure.
|
||||
ensureDir(RESULTS_DIR);
|
||||
|
||||
const ssims: number[] = [];
|
||||
for (let i = 0; i < runs; i++) {
|
||||
const result = await runOnce(opts, fixture, i, runs);
|
||||
ssims.push(result.ssim);
|
||||
}
|
||||
|
||||
// Worst case wins. A min < 0.93 means at least one run produced visibly
|
||||
// different pixels between live playback and sync seek at the same time —
|
||||
// which is the regression we're guarding against (see file-level JSDoc
|
||||
// for why the gate is 0.93 rather than the proposal's 0.95).
|
||||
const minSsim = Math.min(...ssims);
|
||||
const meanSsim = ssims.reduce((a, b) => a + b, 0) / ssims.length;
|
||||
console.log(
|
||||
`[scenario:parity] aggregate min=${minSsim.toFixed(6)} mean=${meanSsim.toFixed(6)} runs=${runs}`,
|
||||
);
|
||||
|
||||
return [
|
||||
{
|
||||
name: "parity_ssim_min",
|
||||
baselineKey: "paritySsimMin",
|
||||
value: minSsim,
|
||||
unit: "ssim",
|
||||
direction: "higher-is-better",
|
||||
samples: ssims,
|
||||
},
|
||||
];
|
||||
}
|
||||
Reference in New Issue
Block a user