update kotlin api for better release native object and add user-friendly apis. (#1275)

sherpa-onnx/kotlin-api/WaveReader.kt

@@ -3,8 +3,49 @@ package com.k2fsa.sherpa.onnx
 
 import android.content.res.AssetManager
 
+data class WaveData(
+    val samples: FloatArray,
+    val sampleRate: Int,
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as WaveData
+
+        if (!samples.contentEquals(other.samples)) return false
+        if (sampleRate != other.sampleRate) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = samples.contentHashCode()
+        result = 31 * result + sampleRate
+        return result
+    }
+}
+
 class WaveReader {
     companion object {
+
+        fun readWave(
+            assetManager: AssetManager,
+            filename: String,
+        ): WaveData {
+            return readWaveFromAsset(assetManager, filename).let {
+                WaveData(it[0] as FloatArray, it[1] as Int)
+            }
+        }
+
+        fun readWave(
+            filename: String,
+        ): WaveData {
+            return readWaveFromFile(filename).let {
+                WaveData(it[0] as FloatArray, it[1] as Int)
+            }
+        }
+
         // Read a mono wave file asset
         // The returned array has two entries:
         //  - the first entry contains an 1-D float array