[teamai] Push 87 resource(s) from XingfenD
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// Vendored plain-JS copy of packages/core/src/mediaGradeAnalyzer.ts.
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// packages/core/src/mediaGradeAnalyzer.vendoredParity.test.ts guards behavior drift.
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import { execFileSync } from "node:child_process";
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import { basename, extname } from "node:path";
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const IMAGE_EXT = new Set([".jpg", ".jpeg", ".png", ".webp", ".gif", ".bmp", ".tif", ".tiff"]);
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const SAMPLE_FRAMES = 5;
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const DEFAULT_TIMEOUT_MS = 15_000;
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const ADJUST_LIMITS = {
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exposure: { min: -2, max: 2 },
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contrast: { min: -1, max: 1 },
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whites: { min: -1, max: 1 },
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blacks: { min: -1, max: 1 },
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temperature: { min: -1, max: 1 },
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tint: { min: -1, max: 1 },
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};
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function clamp(value, key) {
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const limit = ADJUST_LIMITS[key];
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if (!Number.isFinite(value)) return 0;
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return Math.min(limit.max, Math.max(limit.min, value));
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}
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function round(value) {
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const rounded = Math.round(value * 1000) / 1000;
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return Object.is(rounded, -0) ? 0 : rounded;
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}
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function average(values) {
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return values.reduce((sum, value) => sum + value, 0) / Math.max(1, values.length);
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}
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function probeMedia(mediaPath, ffprobePath) {
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try {
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const raw = execFileSync(
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ffprobePath,
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[
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"-v",
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"error",
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"-select_streams",
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"v:0",
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"-show_entries",
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"stream=color_space,color_transfer,color_primaries,pix_fmt,duration:format=duration",
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"-of",
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"json",
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"--",
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mediaPath,
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],
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{ encoding: "utf8", timeout: 5_000, stdio: ["ignore", "pipe", "pipe"] },
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);
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const parsed = JSON.parse(raw);
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const stream = Array.isArray(parsed.streams) ? (parsed.streams[0] ?? {}) : {};
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const duration = Number(stream.duration ?? parsed.format?.duration);
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const text = (key) =>
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typeof stream[key] === "string" && stream[key] ? stream[key] : "unknown";
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return {
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duration: Number.isFinite(duration) && duration > 0 ? duration : null,
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colorSpace: text("color_space"),
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transfer: text("color_transfer"),
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primaries: text("color_primaries"),
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pixelFormat: text("pix_fmt"),
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};
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} catch {
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return {
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duration: null,
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colorSpace: "unknown",
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transfer: "unknown",
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primaries: "unknown",
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pixelFormat: "unknown",
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};
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}
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}
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export function parseMediaTreatmentSignalStats(raw) {
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const frames = [];
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let current = null;
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for (const line of String(raw).split(/\r?\n/)) {
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// One digit is enough: .* consumes the rest without overlapping repetitions.
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const frame = line.match(/^frame:\d.*pts_time:([+-]?(?:\d+(?:\.\d+)?|\.\d+))/);
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if (frame) {
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if (current) frames.push(current);
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current = { ptsTime: Number(frame[1]) };
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continue;
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}
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const stat = line.match(/lavfi\.signalstats\.([A-Z]+)=([+-]?(?:\d+(?:\.\d+)?|\.\d+))/);
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if (!stat) continue;
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current ??= {};
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current[stat[1]] = Number(stat[2]);
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}
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if (current) frames.push(current);
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return frames.filter(
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(frame) =>
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Number.isFinite(frame.YMIN) &&
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Number.isFinite(frame.YLOW) &&
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Number.isFinite(frame.YAVG) &&
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Number.isFinite(frame.YHIGH) &&
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Number.isFinite(frame.YMAX) &&
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Number.isFinite(frame.UAVG) &&
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Number.isFinite(frame.VAVG),
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);
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}
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function summarizeFrames(frames) {
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if (frames.length === 0) throw new Error("FFmpeg returned no analyzable video frames");
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return {
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frames: frames.length,
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yMin: Math.min(...frames.map((frame) => frame.YMIN)),
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yLow: average(frames.map((frame) => frame.YLOW)),
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yAvg: average(frames.map((frame) => frame.YAVG)),
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yHigh: average(frames.map((frame) => frame.YHIGH)),
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yMax: Math.max(...frames.map((frame) => frame.YMAX)),
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uAvg: average(frames.map((frame) => frame.UAVG)),
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vAvg: average(frames.map((frame) => frame.VAVG)),
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satAvg: average(frames.map((frame) => frame.SATAVG ?? 0)),
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shadowClipRisk: average(frames.map((frame) => (frame.YLOW <= 16 ? 1 : 0))),
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highlightClipRisk: average(frames.map((frame) => (frame.YHIGH >= 235 ? 1 : 0))),
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};
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}
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function suggestedExposure(normalizedAverage, yLow, yHigh) {
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if (normalizedAverage < 0.28 && yHigh / 255 < 0.65) {
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return clamp((0.32 - normalizedAverage) * 1.2, "exposure");
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}
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if (normalizedAverage > 0.72 && yLow / 255 > 0.3) {
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return clamp((0.68 - normalizedAverage) * 1.2, "exposure");
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}
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return 0;
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}
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function suggestedTemperature(uAverage, vAverage) {
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const chromaWarmth = (vAverage - 128 + (128 - uAverage)) / 128;
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return Math.abs(chromaWarmth) >= 0.08 ? clamp(-chromaWarmth * 0.25, "temperature") : 0;
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}
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function suggestedTint(uAverage, vAverage) {
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const cast = uAverage + vAverage - 256;
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return Math.abs(cast) >= 10 ? clamp(-cast / 512, "tint") : 0;
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}
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export function statsToAdjust(stats) {
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const yMin = Number(stats.yMin);
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const yLow = Number(stats.yLow ?? stats.yMin);
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const yMax = Number(stats.yMax);
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const yHigh = Number(stats.yHigh ?? stats.yMax);
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const yAvg = Number(stats.yAvg);
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const uAvg = Number(stats.uAvg);
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const vAvg = Number(stats.vAvg);
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const shadowClipRisk = Number(stats.shadowClipRisk ?? (yLow <= 16 ? 1 : 0));
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const highlightClipRisk = Number(stats.highlightClipRisk ?? (yHigh >= 235 ? 1 : 0));
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const percentileSpread = (yHigh - yLow) / 255;
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const normalizedAverage = yAvg / 255;
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const contrast = percentileSpread < 0.35 ? clamp((0.35 - percentileSpread) * 0.4, "contrast") : 0;
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return {
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adjust: {
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exposure: round(suggestedExposure(normalizedAverage, yLow, yHigh)),
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contrast: round(contrast),
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blacks: round(clamp(shadowClipRisk * 0.08, "blacks")),
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whites: round(clamp(-highlightClipRisk * 0.08, "whites")),
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temperature: round(suggestedTemperature(uAvg, vAvg)),
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tint: round(suggestedTint(uAvg, vAvg)),
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},
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measured: {
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frames: Number(stats.frames ?? 1),
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yMin: round(yMin),
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yLow: round(yLow),
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yAvg: round(yAvg),
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yHigh: round(yHigh),
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yMax: round(yMax),
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uAvg: round(uAvg),
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vAvg: round(vAvg),
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satAvg: round(Number(stats.satAvg ?? 0)),
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shadowClipRisk: round(shadowClipRisk),
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highlightClipRisk: round(highlightClipRisk),
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},
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};
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}
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export function summarizeMediaTreatmentAnalysis(probe, frames) {
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const result = statsToAdjust(summarizeFrames(frames));
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const hdr = ["smpte2084", "arib-std-b67"].includes(probe.transfer);
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const diagnosis = [];
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if (result.measured.shadowClipRisk > 0) {
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diagnosis.push("sampled frames contain deep or clipped shadows");
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}
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if (result.measured.highlightClipRisk > 0) {
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diagnosis.push("sampled frames contain bright or clipped highlights");
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}
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if (diagnosis.length === 0) diagnosis.push("no obvious technical imbalance in sampled frames");
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const warnings = [];
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if (hdr) warnings.push("HDR transfer detected; the realtime treatment path is SDR/Rec.709.");
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if (probe.colorSpace === "unknown" || probe.transfer === "unknown") {
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warnings.push(
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"Source color metadata is incomplete; camera LOG cannot be identified reliably from container metadata alone.",
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);
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}
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return {
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...result,
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source: {
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colorSpace: probe.colorSpace,
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transfer: probe.transfer,
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primaries: probe.primaries,
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pixelFormat: probe.pixelFormat,
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hdr,
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log: "unknown",
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},
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diagnosis,
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warnings,
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};
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}
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export function analyzeMediaGrade(
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mediaPath,
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{ ffmpegPath = "ffmpeg", ffprobePath = "ffprobe" } = {},
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) {
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try {
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const probe = probeMedia(mediaPath, ffprobePath);
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const isImage = IMAGE_EXT.has(extname(mediaPath).toLowerCase());
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const fps =
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!isImage && probe.duration
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? Math.max(0.1, Math.min(2, SAMPLE_FRAMES / probe.duration))
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: null;
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const filters = [
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fps ? `fps=${fps.toFixed(4)}` : null,
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"format=yuv444p",
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"signalstats",
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"metadata=print:file=-",
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]
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.filter(Boolean)
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.join(",");
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const raw = execFileSync(
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ffmpegPath,
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[
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"-hide_banner",
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"-nostdin",
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"-v",
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"error",
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"-i",
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mediaPath,
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"-vf",
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filters,
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"-frames:v",
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String(SAMPLE_FRAMES),
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"-f",
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"null",
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"-",
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],
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{
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encoding: "utf8",
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timeout: Number(process.env.HYPERFRAMES_ANALYZE_TIMEOUT_MS) || DEFAULT_TIMEOUT_MS,
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stdio: ["ignore", "pipe", "pipe"],
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},
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);
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return summarizeMediaTreatmentAnalysis(probe, parseMediaTreatmentSignalStats(raw));
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} catch (error) {
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throw new Error(`grade analysis failed for ${mediaPath}: ${error.message}`);
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}
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}
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export function formatMeasuredNote(mediaPath, measured) {
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return `media-use: measured ${basename(mediaPath)}: frames=${measured.frames}, YMIN=${measured.yMin}, YLOW=${measured.yLow}, YAVG=${measured.yAvg}, YHIGH=${measured.yHigh}, YMAX=${measured.yMax}, UAVG=${measured.uAvg}, VAVG=${measured.vAvg}; adjust is a starting suggestion`;
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}
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