Replace Android system TTS engine

android/README.md

@@ -13,3 +13,8 @@ for usage.
 
 - [SherpaOnnxVadAsr](./SherpaOnnxVadAsr) It uses a VAD with a non-streaming
   ASR model.
+
+- [SherpaOnnxTts](./SherpaOnnxTts) It is for standalone text-to-speech.
+
+- [SherpaOnnxTtsEngine](./SherpaOnnxTtsEngine) It is for text-to-speech engine;
+   you can use it to replace the system TTS engine.

android/SherpaOnnxTts/app/src/main/java/com/k2fsa/sherpa/onnx/Tts.kt

@@ -56,6 +56,8 @@ class OfflineTts(
 
     fun sampleRate() = getSampleRate(ptr)
 
+    fun numSpeakers() = getNumSpeakers(ptr)
+
     fun generate(
         text: String,
         sid: Int = 0,
@@ -113,6 +115,7 @@ class OfflineTts(
 
     private external fun delete(ptr: Long)
     private external fun getSampleRate(ptr: Long): Int
+    private external fun getNumSpeakers(ptr: Long): Int
 
     // The returned array has two entries:
     //  - the first entry is an 1-D float array containing audio samples.

android/SherpaOnnxTtsEngine/.gitignore

@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

android/SherpaOnnxTtsEngine/app/.gitignore

@@ -0,0 +1 @@
+/build

android/SherpaOnnxTtsEngine/app/build.gradle.kts

@@ -0,0 +1,71 @@
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+}
+
+android {
+    namespace = "com.k2fsa.sherpa.onnx.tts.engine"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.k2fsa.sherpa.onnx.tts.engine"
+        minSdk = 21
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        vectorDrawables {
+            useSupportLibrary = true
+        }
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+    buildFeatures {
+        compose = true
+    }
+    composeOptions {
+        kotlinCompilerExtensionVersion = "1.5.1"
+    }
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+}
+
+dependencies {
+
+    implementation("androidx.core:core-ktx:1.12.0")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.6.2")
+    implementation("androidx.activity:activity-compose:1.8.2")
+    implementation(platform("androidx.compose:compose-bom:2023.08.00"))
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.ui:ui-graphics")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    implementation("androidx.compose.material3:material3")
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("com.google.android.material:material:1.9.0")
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+    androidTestImplementation(platform("androidx.compose:compose-bom:2023.08.00"))
+    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
+    debugImplementation("androidx.compose.ui:ui-tooling")
+    debugImplementation("androidx.compose.ui:ui-test-manifest")
+}

android/SherpaOnnxTtsEngine/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

android/SherpaOnnxTtsEngine/app/src/androidTest/java/com/k2fsa/sherpa/onnx/tts/engine/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package com.k2fsa.sherpa.onnx.tts.engine
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.k2fsa.sherpa.onnx.tts.engine", appContext.packageName)
+    }
+}

android/SherpaOnnxTtsEngine/app/src/main/AndroidManifest.xml

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.SherpaOnnxTtsEngine"
+        tools:targetApi="31">
+        <activity
+            android:name=".GetSampleText"
+            android:exported="true"
+            android:theme="@android:style/Theme.Translucent.NoTitleBar">
+            <intent-filter>
+                <action android:name="android.speech.tts.engine.GET_SAMPLE_TEXT" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".CheckVoiceData"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.speech.tts.engine.CHECK_TTS_DATA" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".InstallVoiceData"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.speech.tts.engine.INSTALL_TTS_DATA" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+
+        <service
+            android:name=".TtsService"
+            android:enabled="true"
+            android:exported="true"
+            android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.TTS_SERVICE" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.speech.tts"
+                android:resource="@xml/tts_engine" />
+        </service>
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:label="@string/app_name"
+            android:theme="@style/Theme.SherpaOnnxTtsEngine">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.speech.tts.engine.CONFIGURE_ENGINE" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

android/SherpaOnnxTtsEngine/app/src/main/java/com/k2fsa/sherpa/onnx/tts/engine/CheckVoiceData.kt

@@ -0,0 +1,18 @@
+package com.k2fsa.sherpa.onnx.tts.engine
+
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.speech.tts.TextToSpeech
+
+class CheckVoiceData : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val intent = Intent().apply {
+            putStringArrayListExtra(TextToSpeech.Engine.EXTRA_AVAILABLE_VOICES, arrayListOf(TtsEngine.lang))
+            putStringArrayListExtra(TextToSpeech.Engine.EXTRA_UNAVAILABLE_VOICES, arrayListOf())
+        }
+        setResult(TextToSpeech.Engine.CHECK_VOICE_DATA_PASS, intent)
+        finish()
+    }
+}

android/SherpaOnnxTtsEngine/app/src/main/java/com/k2fsa/sherpa/onnx/tts/engine/GetSampleText.kt

@@ -0,0 +1,37 @@
+package com.k2fsa.sherpa.onnx.tts.engine
+
+import android.app.Activity
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.speech.tts.TextToSpeech
+
+class GetSampleText : Activity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        var result = TextToSpeech.LANG_AVAILABLE
+        var text: String = ""
+        when(TtsEngine.lang) {
+            "eng" -> {
+                text = "This is a text-to-speech engine with next generation Kaldi"
+            }
+            "zho", "cmn" -> {
+                text = "使用新一代 Kaldi 进行语音合成"
+            }
+            else -> {
+                result = TextToSpeech.LANG_NOT_SUPPORTED
+            }
+        }
+
+        val intent = Intent().apply{
+            if(result == TextToSpeech.LANG_AVAILABLE) {
+                putExtra(TextToSpeech.Engine.EXTRA_SAMPLE_TEXT, text)
+            } else {
+                putExtra("sampleText", text)
+            }
+        }
+
+        setResult(result, intent)
+        finish()
+    }
+}

android/SherpaOnnxTtsEngine/app/src/main/java/com/k2fsa/sherpa/onnx/tts/engine/InstallVoiceData.kt

@@ -0,0 +1,12 @@
+package com.k2fsa.sherpa.onnx.tts.engine
+
+import android.app.Activity
+import android.os.Bundle
+import android.view.Window
+
+class InstallVoiceData : Activity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        requestWindowFeature(Window.FEATURE_NO_TITLE)
+        super.onCreate(savedInstanceState)
+    }
+}