Add Android demo for audio tagging (#776)

See https://k2-fsa.github.io/sherpa/onnx/audio-tagging/apk.html

kotlin-api-examples/AudioTagging.kt

@@ -1,95 +0,0 @@
-package com.k2fsa.sherpa.onnx
-
-import android.content.res.AssetManager
-import android.util.Log
-
-private val TAG = "sherpa-onnx"
-
-data class OfflineZipformerAudioTaggingModelConfig (
-    val model: String,
-)
-
-data class AudioTaggingModelConfig (
-    var zipformer: OfflineZipformerAudioTaggingModelConfig,
-    var numThreads: Int = 1,
-    var debug: Boolean = false,
-    var provider: String = "cpu",
-)
-
-data class AudioTaggingConfig (
-    var model: AudioTaggingModelConfig,
-    var labels: String,
-    var topK: Int = 5,
-)
-
-data class AudioEvent (
-    val name: String,
-    val index: Int,
-    val prob: Float,
-)
-
-class AudioTagging(
-    assetManager: AssetManager? = null,
-    config: AudioTaggingConfig,
-) {
-    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, topK: Int=-1): ArrayList<AudioEvent> {
-      var events :Array<Any> = compute(ptr, stream.ptr, topK)
-      val ans = ArrayList<AudioEvent>()
-
-      for (e in events) {
-        val p :Array<Any> = e as Array<Any>
-        ans.add(AudioEvent(
-          name=p[0] as String,
-          index=p[1] as Int,
-          prob=p[2] as Float,
-        ))
-      }
-
-      return ans
-    }
-
-    private external fun newFromAsset(
-        assetManager: AssetManager,
-        config: AudioTaggingConfig,
-    ): Long
-
-    private external fun newFromFile(
-        config: AudioTaggingConfig,
-    ): Long
-
-    private external fun delete(ptr: Long)
-
-    private external fun createStream(ptr: Long): Long
-
-    private external fun compute(ptr: Long, streamPtr: Long, topK: Int): Array<Any>
-
-    companion object {
-        init {
-            System.loadLibrary("sherpa-onnx-jni")
-        }
-    }
-}

kotlin-api-examples/AudioTagging.kt

@@ -0,0 +1 @@
+../android/SherpaOnnxAudioTagging/app/src/main/java/com/k2fsa/sherpa/onnx/audio/tagging/AudioTagging.kt

kotlin-api-examples/OfflineStream.kt

@@ -1,24 +0,0 @@
-package com.k2fsa.sherpa.onnx
-
-class OfflineStream(var ptr: Long) {
-    fun acceptWaveform(samples: FloatArray, sampleRate: Int) =
-        acceptWaveform(ptr, samples, sampleRate)
-
-    protected fun finalize() {
-      if(ptr != 0L) {
-        delete(ptr)
-        ptr = 0
-      }
-    }
-
-    fun release() = finalize()
-
-    private external fun acceptWaveform(ptr: Long, samples: FloatArray, sampleRate: Int)
-    private external fun delete(ptr: Long)
-
-    companion object {
-        init {
-            System.loadLibrary("sherpa-onnx-jni")
-        }
-    }
-}

kotlin-api-examples/OfflineStream.kt

@@ -0,0 +1 @@
+../android/SherpaOnnxAudioTagging/app/src/main/java/com/k2fsa/sherpa/onnx/audio/tagging/OfflineStream.kt