Android/IOS speech volume & pitch

.gitignore

@@ -8,3 +8,4 @@ build/
 ios/.generated/
 packages
 pubspec.lock
+.vscode

CHANGELOG.md

@@ -1,5 +1,9 @@
 # ChangeLog
 
+## 0.0.3
+
+- Adding IOS/Android speech pitch and volume
+
 ## 0.0.2
 
 - Flutter formatting and fixing pubspec sdk versioning

README.md

@@ -10,6 +10,8 @@ A flutter text to speech plugin (Swift,Java)
   - [x] get languages
   - [x] set language
   - [x] speech rate
+  - [x] speech volume
+  - [x] speech pitch
 
 ## Usage
 
@@ -50,6 +52,10 @@ List<dynamic> languages = await flutterTts.getLanguages;
 await flutterTts.setLanguage("en-US");
 
 await flutterTts.setRate(1.0);
+
+await flutterTts.setVolume(1.0);
+
+await flutterTts.setPitch(1.0);
 ```
 
 ### Listening for platform calls

android/src/main/java/com/eyedeadevelopers/fluttertts/FlutterTtsPlugin.java

@@ -24,6 +24,7 @@ public class FlutterTtsPlugin implements MethodCallHandler {
   private final Activity activity;
   private TextToSpeech tts;
   String uuid;
+  Bundle bundle;
 
   /**
    * Plugin registration.
@@ -33,8 +34,8 @@ private FlutterTtsPlugin(Activity activity, MethodChannel channel) {
     this.channel = channel;
     this.channel.setMethodCallHandler(this);
 
+    bundle = new Bundle();
     tts = new TextToSpeech(activity.getApplicationContext(), onInitListener);
-    uuid = UUID.randomUUID().toString();
   };
 
   private UtteranceProgressListener utteranceProgressListener = new UtteranceProgressListener() {
@@ -96,6 +97,12 @@ public void onMethodCall(MethodCall call, Result result) {
       String rate = call.arguments.toString();
       setRate(Float.parseFloat(rate));
       result.success(1);
+    } else if (call.method.equals("setVolume")) {
+      String volume = call.arguments.toString();
+      setVolume(Float.parseFloat(volume), result);
+    } else if (call.method.equals("setPitch")) {
+      String pitch = call.arguments.toString();
+      setPitch(Float.parseFloat(pitch), result);
     } else if (call.method.equals("setLanguage")){
       String language = call.arguments.toString();
       setLanguage(language, result);
@@ -125,6 +132,28 @@ void setLanguage(String language, Result result) {
     if (checkLanguage(locale)) {
       tts.setLanguage(locale);
       result.success(1);
+    } else {
+      result.success(0);
+    }
+  }
+
+  void setVolume(float volume, Result result) {
+    if (volume >= 0.0F && volume <= 1.0F) {
+      bundle.putFloat(TextToSpeech.Engine.KEY_PARAM_VOLUME, volume); 
+      result.success(1);
+    } else {
+      Log.e("error", "Invalid volume " + volume + " value - Range is from 0.0 to 1.0");
+      result.success(0);
+    }
+  }
+
+  void setPitch(float pitch, Result result) {
+    if (pitch >= 0.5F && pitch <= 2.0F) {
+      tts.setPitch(pitch);
+      result.success(1);
+    } else {
+      Log.e("error", "Invalid pitch " + pitch + " value - Range is from 0.5 to 2.0");
+      result.success(0);
     }
   }
 
@@ -137,7 +166,8 @@ void getLanguages(Result result) {
   }
 
   void speak(String text) {
-    tts.speak(text, TextToSpeech.QUEUE_FLUSH, null, uuid);
+    uuid = UUID.randomUUID().toString();
+    tts.speak(text, TextToSpeech.QUEUE_FLUSH, bundle, uuid);
   }
 
   void stop() {

example/README.md

@@ -10,6 +10,8 @@ A flutter text to speech plugin (Swift,Java)
   - [x] get languages
   - [x] set language
   - [x] speech rate
+  - [x] speech volume
+  - [x] speech pitch
 
 ## Usage
 
@@ -50,6 +52,10 @@ List<dynamic> languages = await flutterTts.getLanguages;
 await flutterTts.setLanguage("en-US");
 
 await flutterTts.setRate(1.0);
+
+await flutterTts.setVolume(1.0);
+
+await flutterTts.setPitch(1.0);
 ```
 
 ### Listening for platform calls

example/ios/Runner.xcodeproj/project.pbxproj

@@ -158,7 +158,7 @@
 				9705A1C41CF9048500538489 /* Embed Frameworks */,
 				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
 				98A16AC41D9BED755B0C5559 /* [CP] Embed Pods Frameworks */,
-				AEA3A1C207CFA922A52CD034 /* [CP] Copy Pods Resources */,
+				B78DF43B102A908C2B3F0CFF /* [CP] Copy Pods Resources */,
 			);
 			buildRules = (
 			);
@@ -286,7 +286,7 @@
 			shellScript = "\"${SRCROOT}/Pods/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
 			showEnvVarsInLog = 0;
 		};
-		AEA3A1C207CFA922A52CD034 /* [CP] Copy Pods Resources */ = {
+		B78DF43B102A908C2B3F0CFF /* [CP] Copy Pods Resources */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
 			files = (

ios/Classes/SwiftFlutterTtsPlugin.swift

@@ -6,6 +6,8 @@ public class SwiftFlutterTtsPlugin: NSObject, FlutterPlugin, AVSpeechSynthesizer
   let synthesizer = AVSpeechSynthesizer()
   var language: String = AVSpeechSynthesisVoice.currentLanguageCode() 
   var rate: Float = AVSpeechUtteranceDefaultSpeechRate
+  var volume: Float = 1.0
+  var pitch: Float = 1.0
 
   var channel = FlutterMethodChannel()
 
@@ -37,6 +39,14 @@ public class SwiftFlutterTtsPlugin: NSObject, FlutterPlugin, AVSpeechSynthesizer
       self.setRate(rate: Float(rate))
       result(1)
       break
+    case "setVolume":
+      let volume: Double = call.arguments as! Double
+      self.setVolume(volume: Float(volume), result: result)
+      break
+    case "setPitch":
+      let pitch: Double = call.arguments as! Double
+      self.setPitch(pitch: Float(pitch), result: result)
+      break
     case "stop":
       self.stop()
       result(1)
@@ -53,6 +63,8 @@ public class SwiftFlutterTtsPlugin: NSObject, FlutterPlugin, AVSpeechSynthesizer
     let utterance = AVSpeechUtterance(string: text)
     utterance.voice = AVSpeechSynthesisVoice(language: self.language)
     utterance.rate = self.rate
+    utterance.volume = self.volume 
+    utterance.pitchMultiplier = self.pitch 
 
     self.synthesizer.speak(utterance)
   }
@@ -63,7 +75,6 @@ public class SwiftFlutterTtsPlugin: NSObject, FlutterPlugin, AVSpeechSynthesizer
       voices.append(voice.language)
     }
     if !(voices.contains(language)){
-      self.channel.invokeMethod("speak.onError", arguments: "Invalid language code - \(language)")
       result(0)
     } else {
       self.language = language
@@ -75,6 +86,24 @@ public class SwiftFlutterTtsPlugin: NSObject, FlutterPlugin, AVSpeechSynthesizer
     self.rate = rate
   }
 
+  private func setVolume(volume: Float, result: FlutterResult) {
+    if (volume >= 0.0 && volume <= 1.0) {
+      self.volume = volume
+      result(1)
+    } else {
+      result(0)
+    }
+  }
+
+  private func setPitch(pitch: Float, result: FlutterResult) {
+    if (volume >= 0.5 && volume <= 2.0) {
+      self.pitch = pitch
+      result(1)
+    } else {
+      result(0)
+    }
+  }
+
   private func stop() {
     self.synthesizer.stopSpeaking(at: AVSpeechBoundary.immediate)
   }

lib/flutter_tts.dart

@@ -24,6 +24,12 @@ class FlutterTts {
   Future<dynamic> setRate(double rate) =>
       _channel.invokeMethod('setRate', rate);
 
+  Future<dynamic> setVolume(double volume) =>
+      _channel.invokeMethod('setVolume', volume);
+
+  Future<dynamic> setPitch(double pitch) =>
+      _channel.invokeMethod('setPitch', pitch);
+
   Future<dynamic> stop() => _channel.invokeMethod('stop');
 
   Future<dynamic> pause() => _channel.invokeMethod('pause');

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_tts
 description: A flutter plugin for Text to Speech
-version: 0.0.2
+version: 0.0.3
 author: Daniel Lutton <eyedea32@gmail.com>
 homepage: https://github.com/dlutton/flutter_tts