fix: improve seedance reference handling

web/src/lib/seedance-video.ts

@@ -1,4 +1,6 @@
 import type { AiConfig } from "@/stores/use-config-store";
+import type { ReferenceImage } from "@/types/image";
+import type { ReferenceAudio, ReferenceVideo } from "@/types/media";
 
 export const SEEDANCE_REFERENCE_LIMITS = {
     images: 9,
@@ -123,3 +125,44 @@ export function boolConfig(value: string | undefined, fallback: boolean) {
     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${index + 1}`;
+}
+
+export function buildSeedancePromptText(prompt: string, images: ReferenceImage[], videos: ReferenceVideo[], audios: ReferenceAudio[]) {
+    const labels = [
+        ...images.map((_, index) => seedanceReferenceLabel("image", index)),
+        ...videos.map((_, index) => seedanceReferenceLabel("video", index)),
+        ...audios.map((_, index) => seedanceReferenceLabel("audio", index)),
+    ];
+    const text = prompt.trim();
+    if (!labels.length) return text;
+    return `参考素材编号：${labels.join("、")}。请按这些编号理解提示词中的图片、视频和音频引用。\n\n${text}`;
+}
+
+export function seedanceVideoReferenceError(videos: ReferenceVideo[]) {
+    let totalDurationMs = 0;
+    for (let index = 0; index < videos.length; index += 1) {
+        const video = videos[index];
+        const label = seedanceReferenceLabel("video", index);
+        if (video.bytes && video.bytes > SEEDANCE_REFERENCE_LIMITS.videoMaxBytes) return `${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。";