@java.lang.Override
  public com.google.cloud.speech.v2.ExplicitDecodingConfigOrBuilder
      getExplicitDecodingConfigOrBuilder() {
    if (decodingConfigCase_ == 8) {
      return (com.google.cloud.speech.v2.ExplicitDecodingConfig) decodingConfig_;
    }
    return com.google.cloud.speech.v2.ExplicitDecodingConfig.getDefaultInstance();
  }
<pre>
Explicitly specified decoding parameters.
Required if using headerless PCM audio (linear16, mulaw, alaw).
</pre>

<code>.google.cloud.speech.v2.ExplicitDecodingConfig explicit_decoding_config = 8;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/RecognitionConfig.java