example/README.md

Google Speech Examples #

Audio File Example #

To run this example project it is necessary to create a service account Json in the Assets folder of the project. This should have the name: 'test_service_account.json'.

Mic Stream Example #

To run this example project it is necessary to create a service account Json in the Assets folder of the project. This should have the name: 'test_service_account.json'.

``

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:google_speech/google_speech.dart';
import 'package:path_provider/path_provider.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Audio File Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: AudioRecognize(),
    );
  }
}

class AudioRecognize extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _AudioRecognizeState();
}

class _AudioRecognizeState extends State<AudioRecognize> {
  bool recognizing = false;
  bool recognizeFinished = false;
  String text = '';

  void recognize() async {
    setState(() {
      recognizing = true;
    });
    final serviceAccount = ServiceAccount.fromString(
        '${(await rootBundle.loadString('assets/test_service_account.json'))}');
    final speechToText = SpeechToText.viaServiceAccount(serviceAccount);
    final config = _getConfig();
    final audio = await _getAudioContent('test.wav');

    await speechToText.recognize(config, audio).then((value) {
      setState(() {
        text = value.results
            .map((e) => e.alternatives.first.transcript)
            .join('\n');
      });
    }).whenComplete(() => setState(() {
          recognizeFinished = true;
          recognizing = false;
        }));
  }

  void streamingRecognize() async {
    setState(() {
      recognizing = true;
    });
    final serviceAccount = ServiceAccount.fromString(
        '${(await rootBundle.loadString('assets/test_service_account.json'))}');
    final speechToText = SpeechToText.viaServiceAccount(serviceAccount);
    final config = _getConfig();

    final responseStream = speechToText.streamingRecognize(
        StreamingRecognitionConfig(config: config, interimResults: true),
        await _getAudioStream('test.wav'));

    responseStream.listen((data) {
      setState(() {
        text =
            data.results.map((e) => e.alternatives.first.transcript).join('\n');
        recognizeFinished = true;
      });
    }, onDone: () {
      setState(() {
        recognizing = false;
      });
    });
  }

  RecognitionConfig _getConfig() => RecognitionConfig(
      encoding: AudioEncoding.LINEAR16,
      model: RecognitionModel.basic,
      enableAutomaticPunctuation: true,
      sampleRateHertz: 16000,
      languageCode: 'en-US');

  Future<void> _copyFileFromAssets(String name) async {
    var data = await rootBundle.load('assets/$name');
    final directory = await getApplicationDocumentsDirectory();
    final path = directory.path + '/$name';
    await File(path).writeAsBytes(
        data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes));
  }

  Future<List<int>> _getAudioContent(String name) async {
    final directory = await getApplicationDocumentsDirectory();
    final path = directory.path + '/$name';
    if (!File(path).existsSync()) {
      await _copyFileFromAssets(name);
    }
    return File(path).readAsBytesSync().toList();
  }

  Future<Stream<List<int>>> _getAudioStream(String name) async {
    final directory = await getApplicationDocumentsDirectory();
    final path = directory.path + '/$name';
    if (!File(path).existsSync()) {
      await _copyFileFromAssets(name);
    }
    return File(path).openRead();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Audio File Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: <Widget>[
            if (recognizeFinished)
              _RecognizeContent(
                text: text,
              ),
            RaisedButton(
              onPressed: recognizing ? () {} : recognize,
              child: recognizing
                  ? CircularProgressIndicator()
                  : Text('Test with recognize'),
            ),
            SizedBox(
              height: 10.0,
            ),
            RaisedButton(
              onPressed: recognizing ? () {} : streamingRecognize,
              child: recognizing
                  ? CircularProgressIndicator()
                  : Text('Test with streaming recognize'),
            ),
          ],
        ),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

class _RecognizeContent extends StatelessWidget {
  final String text;

  const _RecognizeContent({Key key, this.text}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: Column(
        children: <Widget>[
          Text(
            'The text recognized by the Google Speech Api:',
          ),
          SizedBox(
            height: 16.0,
          ),
          Text(
            text,
            style: Theme.of(context).textTheme.bodyText1,
          ),
        ],
      ),
    );
  }
}
``