fix: unwrap mpv youtube streams for anki media mining

src/anki-integration/media-source.ts

@@ -0,0 +1,82 @@
+import { isRemoteMediaPath } from '../jimaku/utils';
+import type { MpvClient } from '../types';
+
+export type MediaGenerationKind = 'audio' | 'video';
+
+function trimToNonEmptyString(value: unknown): string | null {
+  if (typeof value !== 'string') {
+    return null;
+  }
+  const trimmed = value.trim();
+  return trimmed.length > 0 ? trimmed : null;
+}
+
+function extractUrlsFromMpvEdlSource(source: string): string[] {
+  const matches = source.matchAll(/%\d+%(https?:\/\/.*?)(?=;!new_stream|;!global_tags|$)/gms);
+  return [...matches]
+    .map((match) => trimToNonEmptyString(match[1]))
+    .filter((value): value is string => value !== null);
+}
+
+function classifyMediaUrl(url: string): MediaGenerationKind | null {
+  try {
+    const mime = new URL(url).searchParams.get('mime')?.toLowerCase() ?? '';
+    if (mime.startsWith('audio/')) {
+      return 'audio';
+    }
+    if (mime.startsWith('video/')) {
+      return 'video';
+    }
+  } catch {
+    // Ignore malformed URLs and fall back to stream order.
+  }
+
+  return null;
+}
+
+function resolvePreferredUrlFromMpvEdlSource(
+  source: string,
+  kind: MediaGenerationKind,
+): string | null {
+  const urls = extractUrlsFromMpvEdlSource(source);
+  if (urls.length === 0) {
+    return null;
+  }
+
+  const typedMatch = urls.find((url) => classifyMediaUrl(url) === kind);
+  if (typedMatch) {
+    return typedMatch;
+  }
+
+  return kind === 'audio' ? urls[0] ?? null : urls[urls.length - 1] ?? null;
+}
+
+export async function resolveMediaGenerationInputPath(
+  mpvClient: Pick<MpvClient, 'currentVideoPath' | 'requestProperty'> | null | undefined,
+  kind: MediaGenerationKind = 'video',
+): Promise<string | null> {
+  const currentVideoPath = trimToNonEmptyString(mpvClient?.currentVideoPath);
+  if (!currentVideoPath) {
+    return null;
+  }
+
+  if (!isRemoteMediaPath(currentVideoPath) || !mpvClient?.requestProperty) {
+    return currentVideoPath;
+  }
+
+  try {
+    const streamOpenFilename = trimToNonEmptyString(
+      await mpvClient.requestProperty('stream-open-filename'),
+    );
+    if (streamOpenFilename?.startsWith('edl://')) {
+      return resolvePreferredUrlFromMpvEdlSource(streamOpenFilename, kind) ?? streamOpenFilename;
+    }
+    if (streamOpenFilename) {
+      return streamOpenFilename;
+    }
+  } catch {
+    // Fall back to the current path when mpv does not expose a resolved stream URL.
+  }
+
+  return currentVideoPath;
+}