private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.AutoDetectDecodingConfig,
            com.google.cloud.speech.v2.AutoDetectDecodingConfig.Builder,
            com.google.cloud.speech.v2.AutoDetectDecodingConfigOrBuilder>
        getAutoDecodingConfigFieldBuilder() {
      if (autoDecodingConfigBuilder_ == null) {
        if (!(decodingConfigCase_ == 7)) {
          decodingConfig_ =
              com.google.cloud.speech.v2.AutoDetectDecodingConfig.getDefaultInstance();
        }
        autoDecodingConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.AutoDetectDecodingConfig,
                com.google.cloud.speech.v2.AutoDetectDecodingConfig.Builder,
                com.google.cloud.speech.v2.AutoDetectDecodingConfigOrBuilder>(
                (com.google.cloud.speech.v2.AutoDetectDecodingConfig) decodingConfig_,
                getParentForChildren(),
                isClean());
        decodingConfig_ = null;
      }
      decodingConfigCase_ = 7;
      onChanged();
      return autoDecodingConfigBuilder_;
    }
<pre>
Automatically detect decoding parameters.
Preferred for supported formats.
</pre>

<code>.google.cloud.speech.v2.AutoDetectDecodingConfig auto_decoding_config = 7;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/RecognitionConfig.java