musikr: connect metajni lib to app

musikr/src/main/java/org/oxycblt/musikr/metadata/MetadataExtractor.kt

@@ -38,8 +38,6 @@ private object MetadataExtractorImpl : MetadataExtractor {
         withContext(Dispatchers.IO) {
             val fis = FileInputStream(fd.fileDescriptor)
             val input = NativeInputStream(deviceFile, fis)
-            Log.d("MetadataExtractorImpl", MetadataJNI.openFile(input))
-            //            MetadataJNI.open(deviceFile, fis).also { fis.close() }
-            null
+            MetadataJNI.openFile(input).also { fis.close() }
         }
 }

musikr/src/main/java/org/oxycblt/musikr/metadata/MetadataJNI.kt

@@ -24,5 +24,5 @@ internal object MetadataJNI {
     }
 
     // This is a rust function, Android Studio has no idea how to link to it
-    external fun openFile(input: NativeInputStream): String
+    external fun openFile(input: NativeInputStream): Metadata?
 }