public Builder setAudio(com.google.cloud.speech.v1.RecognitionAudio.Builder builderForValue) {
      if (audioBuilder_ == null) {
        audio_ = builderForValue.build();
      } else {
        audioBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<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/LongRunningRecognizeRequest.java