private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v1p1beta1.RecognitionAudio,
            com.google.cloud.speech.v1p1beta1.RecognitionAudio.Builder,
            com.google.cloud.speech.v1p1beta1.RecognitionAudioOrBuilder>
        getAudioFieldBuilder() {
      if (audioBuilder_ == null) {
        audioBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v1p1beta1.RecognitionAudio,
                com.google.cloud.speech.v1p1beta1.RecognitionAudio.Builder,
                com.google.cloud.speech.v1p1beta1.RecognitionAudioOrBuilder>(
                getAudio(), getParentForChildren(), isClean());
        audio_ = null;
      }
      return audioBuilder_;
    }
<pre>
Required. The audio data to be recognized.
</pre>

<code>
.google.cloud.speech.v1p1beta1.RecognitionAudio audio = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/RecognizeRequest.java