public boolean hasContent() {
      return audioSourceCase_ == 5;
    }
<pre>
The audio data bytes encoded as specified in
[RecognitionConfig][google.cloud.speech.v2.RecognitionConfig]. As
with all bytes fields, proto buffers use a pure binary representation,
whereas JSON representations use base64.
</pre>

<code>bytes content = 5;</code>

@return Whether the content field is set.
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/RecognizeRequest.java