feat(vertexai): Live API breaking changes

packages/firebase_vertexai/firebase_vertexai/example/android/app/build.gradle

@@ -1,3 +1,12 @@
+plugins {
+    id "com.android.application"
+    // START: FlutterFire Configuration
+    id 'com.google.gms.google-services'
+    // END: FlutterFire Configuration
+    id "kotlin-android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
 def localProperties = new Properties()
 def localPropertiesFile = rootProject.file('local.properties')
 if (localPropertiesFile.exists()) {
@@ -6,11 +15,6 @@ if (localPropertiesFile.exists()) {
     }
 }
 
-def flutterRoot = localProperties.getProperty('flutter.sdk')
-if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
-}
-
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
 if (flutterVersionCode == null) {
     flutterVersionCode = '1'
@@ -21,20 +25,14 @@ if (flutterVersionName == null) {
     flutterVersionName = '1.0'
 }
 
-apply plugin: 'com.android.application'
-// START: FlutterFire Configuration
-apply plugin: 'com.google.gms.google-services'
-// END: FlutterFire Configuration
-apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
-
 android {
     namespace "com.example.example"
 
     compileSdk 35
 
     defaultConfig {
         applicationId "com.example.example"
-        minSdk 21
+        minSdk 23
         targetSdk 33
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
@@ -51,6 +49,9 @@ android {
             signingConfig signingConfigs.debug
         }
     }
+    kotlinOptions {
+        jvmTarget = '1.8' // Or '11'
+    }
 }
 
 flutter {

packages/firebase_vertexai/firebase_vertexai/example/android/app/src/main/AndroidManifest.xml

@@ -2,7 +2,8 @@
     <application
         android:label="example"
         android:name="${applicationName}"
-        android:icon="@mipmap/ic_launcher">
+        android:icon="@mipmap/ic_launcher"
+        android:usesCleartextTraffic="true">
         <activity
             android:name=".MainActivity"
             android:exported="true"
@@ -44,4 +45,6 @@
     <uses-permission android:name="android.permission.RECORD_AUDIO"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 </manifest>

packages/firebase_vertexai/firebase_vertexai/example/android/build.gradle

@@ -1,17 +1,3 @@
-buildscript {
-    repositories {
-        google()
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath 'com.android.tools.build:gradle:8.1.2'
-        // START: FlutterFire Configuration
-        classpath 'com.google.gms:google-services:4.4.0'
-        // END: FlutterFire Configuration
-    }
-}
-
 allprojects {
     repositories {
         google()

packages/firebase_vertexai/firebase_vertexai/example/android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-all.zip

packages/firebase_vertexai/firebase_vertexai/example/android/settings.gradle

@@ -5,10 +5,9 @@ pluginManagement {
         def flutterSdkPath = properties.getProperty("flutter.sdk")
         assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
         return flutterSdkPath
-    }
-    settings.ext.flutterSdkPath = flutterSdkPath()
+    }()
 
-    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
 
     repositories {
         google()

packages/firebase_vertexai/firebase_vertexai/example/lib/main.dart

@@ -17,6 +17,9 @@ import 'package:firebase_auth/firebase_auth.dart';
 import 'package:firebase_vertexai/firebase_vertexai.dart';
 import 'package:flutter/material.dart';
 
+// Import after file is generated through flutterfire_cli.
+// import 'package:vertex_ai_example/firebase_options.dart';
+
 import 'pages/chat_page.dart';
 import 'pages/audio_page.dart';
 import 'pages/function_calling_page.dart';
@@ -28,11 +31,11 @@ import 'pages/document.dart';
 import 'pages/video_page.dart';
 import 'pages/bidi_page.dart';
 
-// REQUIRED if you want to run on Web
-const FirebaseOptions? options = null;
-
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
+  // Enable this line instead once have the firebase_options.dart generated and
+  // imported through flutterfire_cli.
+  // await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
   await Firebase.initializeApp();
   await FirebaseAuth.instance.signInAnonymously();
 

packages/firebase_vertexai/firebase_vertexai/example/lib/pages/bidi_page.dart

@@ -59,7 +59,7 @@ class _BidiPageState extends State<BidiPage> {
     super.initState();
 
     final config = LiveGenerationConfig(
-      speechConfig: SpeechConfig(voice: Voice.fenrir),
+      speechConfig: SpeechConfig(voiceName: 'Fenrir'),
       responseModalities: [
         ResponseModalities.audio,
       ],
@@ -328,25 +328,21 @@ class _BidiPageState extends State<BidiPage> {
     }
   }
 
-  Future<void> _handleLiveServerMessage(LiveServerMessage response) async {
-    if (response is LiveServerContent && response.modelTurn != null) {
-      await _handleLiveServerContent(response);
-    }
-
-    if (response is LiveServerContent &&
-        response.turnComplete != null &&
-        response.turnComplete!) {
-      await _handleTurnComplete();
-    }
-
-    if (response is LiveServerContent &&
-        response.interrupted != null &&
-        response.interrupted!) {
-      log('Interrupted: $response');
-    }
+  Future<void> _handleLiveServerMessage(LiveServerResponse response) async {
+    final message = response.message;
 
-    if (response is LiveServerToolCall && response.functionCalls != null) {
-      await _handleLiveServerToolCall(response);
+    if (message is LiveServerContent) {
+      if (message.modelTurn != null) {
+        await _handleLiveServerContent(message);
+      }
+      if (message.turnComplete != null && message.turnComplete!) {
+        await _handleTurnComplete();
+      }
+      if (message.interrupted != null && message.interrupted!) {
+        log('Interrupted: $response');
+      }
+    } else if (message is LiveServerToolCall && message.functionCalls != null) {
+      await _handleLiveServerToolCall(message);
     }
   }
 

packages/firebase_vertexai/firebase_vertexai/example/lib/utils/audio_recorder.dart

@@ -137,6 +137,10 @@ class InMemoryAudioRecorder {
       encoder: _encoder,
       sampleRate: 16000,
       numChannels: 1,
+      androidConfig: const AndroidRecordConfig(
+        muteAudio: true,
+        audioSource: AndroidAudioSource.mic,
+      ),
     );
     final devs = await _recorder.listInputDevices();
     debugPrint(devs.toString());

packages/firebase_vertexai/firebase_vertexai/example/macos/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -59,6 +59,7 @@
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
+      enableGPUValidationMode = "1"
       allowLocationSimulation = "YES">
       <BuildableProductRunnable
          runnableDebuggingMode = "0">

packages/firebase_vertexai/firebase_vertexai/lib/firebase_vertexai.dart

@@ -72,11 +72,11 @@ export 'src/live_api.dart'
     show
         LiveGenerationConfig,
         SpeechConfig,
-        Voice,
         ResponseModalities,
         LiveServerMessage,
         LiveServerContent,
         LiveServerToolCall,
-        LiveServerToolCallCancellation;
+        LiveServerToolCallCancellation,
+        LiveServerResponse;
 export 'src/live_session.dart' show LiveSession;
 export 'src/schema.dart' show Schema, SchemaType;

packages/firebase_vertexai/firebase_vertexai/lib/src/live_api.dart

@@ -15,53 +15,64 @@ import 'api.dart';
 import 'content.dart';
 import 'error.dart';
 
-/// The available voice options for speech synthesis.
-enum Voice {
+/// Configuration for a prebuilt voice.
+///
+/// This class allows specifying a voice by its name.
+class PrebuiltVoiceConfig {
   // ignore: public_member_api_docs
-  aoede('Aoede'),
+  const PrebuiltVoiceConfig({this.voiceName});
 
+  /// The voice name to use for speech synthesis.
+  ///
+  /// See https://cloud.google.com/text-to-speech/docs/chirp3-hd for names and
+  /// sound demos.
+  final String? voiceName;
   // ignore: public_member_api_docs
-  charon('Charon'),
+  Map<String, Object?> toJson() =>
+      {if (voiceName case final voiceName?) 'voice_name': voiceName};
+}
 
+/// Configuration for the voice to be used in speech synthesis.
+///
+/// This class currently supports using a prebuilt voice configuration.
+class VoiceConfig {
   // ignore: public_member_api_docs
-  fenrir('Fenrir'),
+  VoiceConfig({this.prebuiltVoiceConfig});
 
   // ignore: public_member_api_docs
-  kore('Kore'),
-
+  final PrebuiltVoiceConfig? prebuiltVoiceConfig;
   // ignore: public_member_api_docs
-  puck('Puck');
-
-  const Voice(this._jsonString);
-  final String _jsonString;
-
-  // ignore: public_member_api_docs
-  String toJson() => _jsonString;
+  Map<String, Object?> toJson() => {
+        if (prebuiltVoiceConfig case final prebuiltVoiceConfig?)
+          'prebuilt_voice_config': prebuiltVoiceConfig.toJson()
+      };
 }
 
 /// Configures speech synthesis settings.
+///
+/// Allows specifying the desired voice for speech synthesis.
 class SpeechConfig {
   /// Creates a [SpeechConfig] instance.
   ///
-  /// [voice] (optional): The desired voice for speech synthesis.
-  SpeechConfig({this.voice});
-
-  /// The voice to use for speech synthesis.
-  final Voice? voice;
+  /// [voiceName] See https://cloud.google.com/text-to-speech/docs/chirp3-hd
+  /// for names and sound demos.
+  SpeechConfig({String? voiceName})
+      : voiceConfig = voiceName != null
+            ? VoiceConfig(
+                prebuiltVoiceConfig: PrebuiltVoiceConfig(voiceName: voiceName))
+            : null;
+
+  /// The voice config to use for speech synthesis.
+  final VoiceConfig? voiceConfig;
   // ignore: public_member_api_docs
   Map<String, Object?> toJson() => {
-        if (voice case final voice?)
-          'voice_config': {
-            'prebuilt_voice_config': {'voice_name': voice.toJson()}
-          }
+        if (voiceConfig case final voiceConfig?)
+          'voice_config': voiceConfig.toJson()
       };
 }
 
 /// The available response modalities.
 enum ResponseModalities {
-  /// Unspecified response modality.
-  unspecified('MODALITY_UNSPECIFIED'),
-
   /// Text response modality.
   text('TEXT'),
 
@@ -132,6 +143,7 @@ class LiveServerContent implements LiveServerMessage {
   /// [interrupted] (optional): Indicates if the generation was interrupted.
   LiveServerContent({this.modelTurn, this.turnComplete, this.interrupted});
 
+  // TODO(cynthia): Add accessor for media content
   /// The content generated by the model.
   final Content? modelTurn;
 
@@ -176,6 +188,19 @@ class LiveServerToolCallCancellation implements LiveServerMessage {
   final List<String>? functionIds;
 }
 
+/// A single response chunk received during a live content generation.
+///
+/// It can contain generated content, function calls to be executed, or
+/// instructions to cancel previous function calls, along with the status of the
+/// ongoing generation.
+class LiveServerResponse {
+  // ignore: public_member_api_docs
+  LiveServerResponse({required this.message});
+
+  /// The server message generated by the live model.
+  final LiveServerMessage message;
+}
+
 /// Represents realtime input from the client in a live stream.
 class LiveClientRealtimeInput {
   /// Creates a [LiveClientRealtimeInput] instance.
@@ -237,7 +262,7 @@ class LiveClientToolResponse {
       };
 }
 
-/// Parses a JSON object received from the live server into a [LiveServerMessage].
+/// Parses a JSON object received from the live server into a [LiveServerResponse].
 ///
 /// This function handles different types of server messages, including:
 /// - Error messages, which result in a [VertexAIException] being thrown.
@@ -275,8 +300,13 @@ class LiveClientToolResponse {
 /// - [jsonObject]: The JSON object received from the live server.
 ///
 /// Returns:
-/// - A [LiveServerMessage] object representing the parsed message.
-LiveServerMessage parseServerMessage(Object jsonObject) {
+/// - A [LiveServerResponse] object representing the parsed message.
+LiveServerResponse parseServerResponse(Object jsonObject) {
+  LiveServerMessage message = _parseServerMessage(jsonObject);
+  return LiveServerResponse(message: message);
+}
+
+LiveServerMessage _parseServerMessage(Object jsonObject) {
   if (jsonObject case {'error': final Object error}) {
     throw parseError(error);
   }

packages/firebase_vertexai/firebase_vertexai/lib/src/live_session.dart

@@ -33,7 +33,7 @@ class LiveSession {
           var jsonString = utf8.decode(message);
           var response = json.decode(jsonString);
 
-          _messageController.add(parseServerMessage(response));
+          _messageController.add(parseServerResponse(response));
         } catch (e) {
           _messageController.addError(e);
         }
@@ -45,7 +45,7 @@ class LiveSession {
     );
   }
   final WebSocketChannel _ws;
-  final _messageController = StreamController<LiveServerMessage>.broadcast();
+  final _messageController = StreamController<LiveServerResponse>.broadcast();
   late StreamSubscription _wsSubscription;
 
   /// Sends content to the server.
@@ -107,10 +107,10 @@ class LiveSession {
 
   /// Receives messages from the server.
   ///
-  /// Returns a [Stream] of [LiveServerMessage] objects representing the
+  /// Returns a [Stream] of [LiveServerResponse] objects representing the
   /// messages received from the server. The stream will stops once the server
   /// sends turn complete message.
-  Stream<LiveServerMessage> receive() async* {
+  Stream<LiveServerResponse> receive() async* {
     _checkWsStatus();
 
     await for (final result in _messageController.stream) {