public Builder clearAudioSource() {
      audioSourceCase_ = 0;
      audioSource_ = null;
      onChanged();
      return this;
    }
<pre>
Metadata about a single file in a batch for BatchRecognize.
</pre>

Protobuf type {@code google.cloud.speech.v2.BatchRecognizeFileMetadata}
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/BatchRecognizeFileMetadata.java