refactor: expose portable source record protocols

src/sources/cctvTypes.js

@@ -0,0 +1,28 @@
+/**
+ * Canonicalize a CCTV feed type string to one of:
+ * 'image', 'mjpeg', 'mp4', 'webm', 'hls', or pass-through.
+ *
+ * @param {string} value - Raw feed type (e.g. 'jpeg', 'mjpg', 'video', 'stream').
+ * @returns {string} Normalized feed type.
+ */
+export function normalizeFeedType(value) {
+  const raw = String(value || '')
+    .trim()
+    .toLowerCase();
+  if (!raw) return 'image';
+  if (raw === 'jpeg' || raw === 'jpg' || raw === 'png') return 'image';
+  if (raw === 'mjpg') return 'mjpeg';
+  if (raw === 'video') return 'mp4';
+  if (raw === 'stream') return 'hls';
+  return raw;
+}
+
+/**
+ * Check whether a normalized feed type represents streaming video.
+ *
+ * @param {string} feedType
+ * @returns {boolean}
+ */
+export function isVideoFeedType(feedType) {
+  return feedType === 'mp4' || feedType === 'webm' || feedType === 'hls';
+}