Work around a bug in the Android 13 ClearKey implementation

The ClearKey CDM will attach an 'invalid' URL in `KeyRequest` objects,
when the documentation states this should be an empty string if a
default URL is not known.

#minor-release

PiperOrigin-RevId: 476113513

RELEASENOTES.md

@@ -29,6 +29,9 @@
         `MetadataRenderer(MetadataOutput, Looper, MetadataDecoderFactory,
         boolean)` to specify whether the renderer will output metadata early or
         in sync with the player position.
+*   DRM:
+    *   Work around a bug in the Android 13 ClearKey implementation that returns
+        a non-empty but invalid license URL.
 *   DASH:
     *   Parse `EventStream.presentationTimeOffset` from manifests
         ([#10460](https://github.com/google/ExoPlayer/issues/10460)).

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/drm/FrameworkMediaDrm.java

@@ -229,11 +229,7 @@ public KeyRequest getKeyRequest(
         mediaDrm.getKeyRequest(scope, initData, mimeType, keyType, optionalParameters);
 
     byte[] requestData = adjustRequestData(uuid, request.getData());
-
-    String licenseServerUrl = request.getDefaultUrl();
-    if (MOCK_LA_URL_VALUE.equals(licenseServerUrl)) {
-      licenseServerUrl = "";
-    }
+    String licenseServerUrl = adjustLicenseServerUrl(request.getDefaultUrl());
     if (TextUtils.isEmpty(licenseServerUrl)
         && schemeData != null
         && !TextUtils.isEmpty(schemeData.licenseServerUrl)) {
@@ -247,6 +243,17 @@ public KeyRequest getKeyRequest(
     return new KeyRequest(requestData, licenseServerUrl, requestType);
   }
 
+  private static String adjustLicenseServerUrl(String licenseServerUrl) {
+    if (MOCK_LA_URL.equals(licenseServerUrl)) {
+      return "";
+    } else if (Util.SDK_INT == 33 && "https://default.url".equals(licenseServerUrl)) {
+      // Work around b/247808112
+      return "";
+    } else {
+      return licenseServerUrl;
+    }
+  }
+
   @UnstableApi
   @Override
   @Nullable