Add JNI support for spoken language identification (#782)

kotlin-api-examples/SpokenLanguageIdentification.kt

@@ -0,0 +1,71 @@
+package com.k2fsa.sherpa.onnx
+
+import android.content.res.AssetManager
+import android.util.Log
+
+private val TAG = "sherpa-onnx"
+
+data class SpokenLanguageIdentificationWhisperConfig (
+    var encoder: String,
+    var decoder: String,
+    var tailPaddings: Int = -1,
+)
+
+data class SpokenLanguageIdentificationConfig (
+    var whisper: SpokenLanguageIdentificationWhisperConfig,
+    var numThreads: Int = 1,
+    var debug: Boolean = false,
+    var provider: String = "cpu",
+)
+
+class SpokenLanguageIdentification (
+    assetManager: AssetManager? = null,
+    config: SpokenLanguageIdentificationConfig,
+) {
+    private var ptr: Long
+
+    init {
+        ptr = if (assetManager != null) {
+            newFromAsset(assetManager, config)
+        } else {
+            newFromFile(config)
+        }
+    }
+
+    protected fun finalize() {
+        if (ptr != 0L) {
+            delete(ptr)
+            ptr = 0
+        }
+    }
+
+    fun release() = finalize()
+
+    fun createStream(): OfflineStream {
+        val p = createStream(ptr)
+        return OfflineStream(p)
+    }
+
+    fun compute(stream: OfflineStream) =  compute(ptr, stream.ptr)
+
+    private external fun newFromAsset(
+        assetManager: AssetManager,
+        config: SpokenLanguageIdentificationConfig,
+    ): Long
+
+    private external fun newFromFile(
+        config: SpokenLanguageIdentificationConfig,
+    ): Long
+
+    private external fun delete(ptr: Long)
+
+    private external fun createStream(ptr: Long): Long
+
+    private external fun compute(ptr: Long, streamPtr: Long): String
+
+    companion object {
+        init {
+            System.loadLibrary("sherpa-onnx-jni")
+        }
+    }
+}