Add playback error messages and fix error propogation

src/utils/mediaError.ts

@@ -0,0 +1,11 @@
+import { MediaError } from 'types/mediaError';
+
+/**
+ * Maps a DOMException name to an equivalent {@link MediaError}.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/DOMException#error_names
+ */
+export function getMediaError(e?: DOMException): MediaError {
+    if (e?.name === 'NotSupportedError') return MediaError.MEDIA_NOT_SUPPORTED;
+    return MediaError.PLAYER_ERROR;
+}