ttstd-infinite-canvas/web/src/lib/seedance-video.ts

import { modelOptionName, resolveModelRequestConfig, type AiConfig } from "@/stores/use-config-store";
import { normalizeVideoDuration, VIDEO_DURATION_OPTIONS } from "@/lib/video-generation-options";
import type { ReferenceImage } from "@/types/image";
import type { ReferenceAudio, ReferenceVideo } from "@/types/media";

export const SEEDANCE_REFERENCE_LIMITS = {
    images: 9,
    videos: 3,
    audios: 3,
    imageMaxBytes: 30 * 1024 * 1024,
    videoMaxBytes: 50 * 1024 * 1024,
    audioMaxBytes: 15 * 1024 * 1024,
};

export const seedanceResolutionOptions = [
    { value: "480p", label: "480P" },
    { value: "720p", label: "720P" },
    { value: "1080p", label: "1080P" },
] as const;

export const seedanceRatioOptions = [
    { value: "16:9", label: "横屏" },
    { value: "9:16", label: "竖屏" },
    { value: "1:1", label: "方形" },
    { value: "4:3", label: "标准横屏" },
    { value: "3:4", label: "标准竖屏" },
    { value: "21:9", label: "宽银幕" },
    { value: "adaptive", label: "自适应" },
] as const;

export const seedanceDurationOptions = VIDEO_DURATION_OPTIONS;

const seedancePixels = {
    "480p": {
        "16:9": "864x496",
        "4:3": "752x560",
        "1:1": "640x640",
        "3:4": "560x752",
        "9:16": "496x864",
        "21:9": "992x432",
    },
    "720p": {
        "16:9": "1280x720",
        "4:3": "1112x834",
        "1:1": "960x960",
        "3:4": "834x1112",
        "9:16": "720x1280",
        "21:9": "1470x630",
    },
    "1080p": {
        "16:9": "1920x1080",
        "4:3": "1664x1248",
        "1:1": "1440x1440",
        "3:4": "1248x1664",
        "9:16": "1080x1920",
        "21:9": "2206x946",
    },
} as const;

export function isSeedanceVideoConfig(config: AiConfig | Pick<AiConfig, "model" | "videoModel" | "baseUrl">) {
    const requestConfig = "channels" in config ? resolveModelRequestConfig(config, config.model || config.videoModel) : config;
    // Agent Plan 图片与视频共用 /api/plan/v3；按协议排除图片，避免 Seedream 误判为 Seedance。
    if ("interfaceType" in requestConfig) {
        const interfaceType = requestConfig.interfaceType;
        if (interfaceType === "volcengine-ark-image" || interfaceType === "volcengine-ark-agent-plan-image") return false;
    }
    return isSeedanceVideoModel(modelOptionName(requestConfig.model || requestConfig.videoModel)) || isArkPlanBaseUrl(requestConfig.baseUrl || "");
}

export function isSeedanceVideoModel(model: string) {
    const value = model.toLowerCase();
    return value.includes("seedance") || value.includes("doubao-seedance");
}

export function isSeedanceFastModel(model: string) {
    const value = model.toLowerCase();
    return isSeedanceVideoModel(value) && value.includes("fast");
}

export function isArkPlanBaseUrl(baseUrl: string) {
    return baseUrl.toLowerCase().includes("ark.cn-beijing.volces.com/api/plan/v3") || baseUrl.toLowerCase().includes("/api/plan/v3");
}

export function normalizeSeedanceResolution(value: string, model = "") {
    const normalized = normalizeResolutionToken(value);
    if (isSeedanceFastModel(model) && (normalized === "1080p" || normalized === "2160p")) return "720p";
    return normalized === "2160p" || seedanceResolutionOptions.some((item) => item.value === normalized) ? normalized : "720p";
}

export function normalizeResolutionToken(value: string) {
    if (value === "low") return "480p";
    if (value === "auto" || value === "high" || value === "medium") return "720p";
    if (value.toLowerCase() === "4k") return "2160p";
    const resolution = String(value || "").replace(/p$/i, "") || "720";
    return `${resolution}p`;
}

export function normalizeSeedanceDuration(value: string) {
    return Number(normalizeVideoDuration(value));
}

export function normalizeSeedanceRatio(value: string) {
    if (!value || value === "auto" || value === "adaptive") return "adaptive";
    if (seedanceRatioOptions.some((item) => item.value === value)) return value;
    const match = value.match(/^(\d+)x(\d+)$/);
    if (!match) return "adaptive";
    const width = Number(match[1]);
    const height = Number(match[2]);
    if (!width || !height) return "adaptive";
    const ratio = width / height;
    const options = [
        ["16:9", 16 / 9],
        ["4:3", 4 / 3],
        ["1:1", 1],
        ["3:4", 3 / 4],
        ["9:16", 9 / 16],
        ["21:9", 21 / 9],
    ] as const;
    return options.reduce((best, item) => (Math.abs(item[1] - ratio) < Math.abs(best[1] - ratio) ? item : best), options[0])[0];
}

export function seedancePixelLabel(resolution: string, ratio: string) {
    const normalizedResolution = normalizeSeedanceResolution(resolution) as keyof typeof seedancePixels;
    const normalizedRatio = normalizeSeedanceRatio(ratio) as keyof (typeof seedancePixels)[typeof normalizedResolution] | "adaptive";
    if (normalizedRatio === "adaptive") return "自动匹配";
    return seedancePixels[normalizedResolution][normalizedRatio] || "";
}

export function boolConfig(value: string | undefined, fallback: boolean) {
    if (value === "true") return true;
    if (value === "false") return false;
    return fallback;
}

export function seedanceReferenceLabel(kind: "image" | "video" | "audio", index: number) {
    if (kind === "image") return `图片${index + 1}`;
    if (kind === "video") return `视频${index + 1}`;
    return `音频${index + 1}`;
}

export function buildSeedancePromptText(prompt: string, _images: ReferenceImage[], _videos: ReferenceVideo[], _audios: ReferenceAudio[]) {
    return prompt.trim();
}

export function seedanceVideoReferenceError(videos: ReferenceVideo[]) {
    let totalDurationMs = 0;
    for (let index = 0; index < videos.length; index += 1) {
        const video = videos[index];
        const label = seedanceReferenceLabel("video", index);
        if (video.bytes && video.bytes > SEEDANCE_REFERENCE_LIMITS.videoMaxBytes) return `${label} 超过 50MB，请压缩后再上传`;
        if (video.durationMs) {
            if (video.durationMs < 2000 || video.durationMs > 15000) return `${label} 时长需要在 2-15 秒之间`;
            totalDurationMs += video.durationMs;
        }
        if (video.width && video.height) {
            if (video.width < 300 || video.width > 6000 || video.height < 300 || video.height > 6000) return `${label} 宽高需要在 300-6000px 之间`;
            const ratio = video.width / video.height;
            if (ratio < 0.4 || ratio > 2.5) return `${label} 宽高比需要在 0.4-2.5 之间`;
            const pixels = video.width * video.height;
            if (pixels < 640 * 640 || pixels > 2206 * 946) return `${label} 像素总量不符合 Seedance 要求，请转成 480p/720p/1080p 后再上传`;
        }
    }
    if (totalDurationMs > 15000) return "Seedance 参考视频总时长不能超过 15 秒";
    return "";
}

export const seedanceVideoReferenceHint = "参考视频需为 mp4/mov，H.264/H.265，FPS 24-60；含真人人脸素材请使用火山授权 asset:// 素材。";