Add Java API for spoken language identification with whisper multilingual models (#817)

sherpa-onnx/java-api/src/com/k2fsa/sherpa/onnx/SpokenLanguageIdentification.java

@@ -0,0 +1,59 @@
+// Copyright 2024 Xiaomi Corporation
+
+package com.k2fsa.sherpa.onnx;
+
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+public class SpokenLanguageIdentification {
+    static {
+        System.loadLibrary("sherpa-onnx-jni");
+    }
+
+    private final Map<String, String> localeMap;
+    private long ptr = 0; // this is the asr engine ptrss
+
+    public SpokenLanguageIdentification(SpokenLanguageIdentificationConfig config) {
+        ptr = newFromFile(config);
+
+        String[] languages = Locale.getISOLanguages();
+        localeMap = new HashMap<String, String>(languages.length);
+        for (String language : languages) {
+            Locale locale = new Locale(language);
+            localeMap.put(language, locale.getDisplayName());
+        }
+    }
+
+    public String compute(OfflineStream stream) {
+        String lang = compute(ptr, stream.getPtr());
+        return localeMap.getOrDefault(lang, lang);
+    }
+
+    public OfflineStream createStream() {
+        long p = createStream(ptr);
+        return new OfflineStream(p);
+    }
+
+    @Override
+    protected void finalize() throws Throwable {
+        release();
+    }
+
+    // You'd better call it manually if it is not used anymore
+    public void release() {
+        if (this.ptr == 0) {
+            return;
+        }
+        delete(this.ptr);
+        this.ptr = 0;
+    }
+
+    private native void delete(long ptr);
+
+    private native long newFromFile(SpokenLanguageIdentificationConfig config);
+
+    private native long createStream(long ptr);
+
+    private native String compute(long ptr, long streamPtr);
+}