synthesize()

// Load a TTS voice
await RunAnywhere.tts.loadVoice('vits-piper-en_US-lessac-medium');

// Synthesize and play in one call
await RunAnywhere.speak('Hello! Welcome to RunAnywhere.');

// Or get the audio back
final output = await RunAnywhere.synthesize('Hello! Welcome to RunAnywhere.');
print('Duration: ${output.durationMs}ms at ${output.sampleRate} Hz');

// Slower, lower pitch for emphasis
final output = await RunAnywhere.synthesize(
  'Important announcement!',
  TTSOptions(
    speakingRate: 0.8,
    pitch: 0.9,
    volume: 1.0,
  ),
);

import 'package:runanywhere_onnx/runanywhere_onnx.dart';

await Onnx.register();

await RunAnywhere.models.registerArchiveModel(
  id: 'vits-piper-en_US-lessac-medium',
  name: 'Piper TTS (US English - Medium)',
  archiveUrl:
      'https://github.com/RunanywhereAI/sherpa-onnx/releases/download/runanywhere-models-v1/vits-piper-en_US-lessac-medium.tar.gz',
  archiveType: ArchiveType.ARCHIVE_TYPE_TAR_GZ,
  structure: ArchiveStructure.ARCHIVE_STRUCTURE_NESTED_DIRECTORY,
  framework: InferenceFramework.INFERENCE_FRAMEWORK_SHERPA,
  modality: ModelCategory.MODEL_CATEGORY_SPEECH_SYNTHESIS,
  memoryRequirement: 65000000,
);

await RunAnywhere.downloadModel(
  'vits-piper-en_US-lessac-medium',
  onProgress: (p) async {
    print('${(p.overallProgress * 100).toStringAsFixed(1)}%');
  },
);

await RunAnywhere.tts.loadVoice('vits-piper-en_US-lessac-medium');

await RunAnywhere.speak('Hello there.');

// Observe playback
RunAnywhere.tts.playbackStateStream.listen((isPlaying) => setState(() {}));
RunAnywhere.tts.playbackProgressStream.listen((fraction) => setState(() {}));

// Stop player and synthesis together
await RunAnywhere.stopSpeaking();

class TextToSpeechDemo extends StatefulWidget {
  @override
  _TextToSpeechDemoState createState() => _TextToSpeechDemoState();
}

class _TextToSpeechDemoState extends State<TextToSpeechDemo> {
  final _controller = TextEditingController();
  bool _isSpeaking = false;
  bool _isLoaded = false;

  static const _voiceId = 'vits-piper-en_US-lessac-medium';

  @override
  void initState() {
    super.initState();
    _initTTS();
  }

  Future<void> _initTTS() async {
    // Download if needed
    final models = await RunAnywhere.models.available();
    final ttsModel = models.firstWhere((m) => m.id == _voiceId);

    if (!ttsModel.isDownloaded) {
      await RunAnywhere.downloadModel(ttsModel.id);
    }

    await RunAnywhere.tts.loadVoice(_voiceId);
    setState(() => _isLoaded = true);
  }

  Future<void> _speak() async {
    if (_controller.text.isEmpty) return;

    setState(() => _isSpeaking = true);
    try {
      // Synthesizes and plays through the SDK's playback manager
      await RunAnywhere.speak(_controller.text);
    } finally {
      setState(() => _isSpeaking = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        TextField(
          controller: _controller,
          decoration: InputDecoration(
            hintText: 'Enter text to speak...',
          ),
          maxLines: 3,
        ),
        SizedBox(height: 16),
        ElevatedButton.icon(
          onPressed: _isLoaded && !_isSpeaking ? _speak : null,
          icon: Icon(_isSpeaking ? Icons.stop : Icons.volume_up),
          label: Text(_isSpeaking ? 'Speaking...' : 'Speak'),
        ),
      ],
    );
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }
}