Stream audio from mic to IBM Watson SpeechToText Web service using Java SDK

Question

Trying to send a continuous audio stream from microphone directly to IBM Watson SpeechToText Web service using the Java SDK. One of the examples provided with the distributi

Answer 1

The Java SDK has an example and supports this.

Update your pom.xml with:

 
   com.ibm.watson.developer_cloud
   java-sdk
   3.3.1
 

Here is an example of how to listen to your microphone.

SpeechToText service = new SpeechToText();
service.setUsernameAndPassword("", "");

// Signed PCM AudioFormat with 16kHz, 16 bit sample size, mono
int sampleRate = 16000;
AudioFormat format = new AudioFormat(sampleRate, 16, 1, true, false);
DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);

if (!AudioSystem.isLineSupported(info)) {
  System.out.println("Line not supported");
  System.exit(0);
}

TargetDataLine line = (TargetDataLine) AudioSystem.getLine(info);
line.open(format);
line.start();

AudioInputStream audio = new AudioInputStream(line);

RecognizeOptions options = new RecognizeOptions.Builder()
  .continuous(true)
  .interimResults(true)
  .timestamps(true)
  .wordConfidence(true)
  //.inactivityTimeout(5) // use this to stop listening when the speaker pauses, i.e. for 5s
  .contentType(HttpMediaType.AUDIO_RAW + "; rate=" + sampleRate)
  .build();

service.recognizeUsingWebSocket(audio, options, new BaseRecognizeCallback() {
  @Override
  public void onTranscription(SpeechResults speechResults) {
    System.out.println(speechResults);
  }
});

System.out.println("Listening to your voice for the next 30s...");
Thread.sleep(30 * 1000);

// closing the WebSockets underlying InputStream will close the WebSocket itself.
line.stop();
line.close();

System.out.println("Fin.");