Vosk Flutter Plugin

IOS works with pod 1.14.3

Flutter plugin for Vosk speech recognition.

Platform Support

Android	iOS	MacOS	Web	Linux	Windows
✔	✔	➖	➖	✔	✔

Usage

Installation

Follow the instruction at the Installing page to install the plugin.

Load model

From the assets:

flutter:
  assets:
    - assets/models/

From the network:

final vosk = VoskFlutterPlugin.instance();
final enSmallModelPath = await ModelLoader()
    .loadFromAssets('assets/models/vosk-model-small-en-us-0.15.zip');

Create recognizer

final recognizer = await vosk.createRecognizer(
    model: model,
    sampleRate: sampleRate,
);
final recognizerWithGrammar = await vosk.createRecognizer(
    model: model,
    sampleRate: sampleRate,
    grammar: ['one', 'two', 'three'],
);

Recognize audio data

From the file:

Uint8List audioBytes = ...; // audio data in PCM 16-bit mono format
List<String> results = [];
int chunkSize = 8192;
int pos = 0;

while (pos + chunkSize < audioBytes.length) {
    final resultReady = await recognizer.acceptWaveformBytes(
      Uint8List.fromList(audioBytes.getRange(pos, pos + chunkSize).toList()));
    pos += chunkSize;

    if (resultReady) {
      print(await recognizer.getResult());
    } else {
      print(await recognizer.getPartialResult());
    }
}
await recognizer.acceptWaveformBytes(
  Uint8List.fromList(audioBytes.getRange(pos, audioBytes.length).toList()));
print(await recognizer.getFinalResult());

From the microphone(you can use any suitable flutter plugin to get the micStream, for example mic_stream):

Uint8List micStream = ...;
final speechService = await vosk.initSpeechService(recognizer);
speechService.onPartial().forEach((partial) => print(partial));
speechService.onResult().forEach((result) => print(result));
await speechService.start(micStream);