public com.google.cloud.speech.v1.RecognitionAudioOrBuilder getAudioOrBuilder() {
      if (audioBuilder_ != null) {
        return audioBuilder_.getMessageOrBuilder();
      } else {
        return audio_ == null
            ? com.google.cloud.speech.v1.RecognitionAudio.getDefaultInstance()
            : audio_;
      }
    }
<pre>
Required. The audio data to be recognized.
</pre>

<code>
.google.cloud.speech.v1.RecognitionAudio audio = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/RecognizeRequest.java