@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (interactionType_
        != com.google.cloud.speech.v1.RecognitionMetadata.InteractionType
            .INTERACTION_TYPE_UNSPECIFIED
            .getNumber()) {
      output.writeEnum(1, interactionType_);
    }
    if (industryNaicsCodeOfAudio_ != 0) {
      output.writeUInt32(3, industryNaicsCodeOfAudio_);
    }
    if (microphoneDistance_
        != com.google.cloud.speech.v1.RecognitionMetadata.MicrophoneDistance
            .MICROPHONE_DISTANCE_UNSPECIFIED
            .getNumber()) {
      output.writeEnum(4, microphoneDistance_);
    }
    if (originalMediaType_
        != com.google.cloud.speech.v1.RecognitionMetadata.OriginalMediaType
            .ORIGINAL_MEDIA_TYPE_UNSPECIFIED
            .getNumber()) {
      output.writeEnum(5, originalMediaType_);
    }
    if (recordingDeviceType_
        != com.google.cloud.speech.v1.RecognitionMetadata.RecordingDeviceType
            .RECORDING_DEVICE_TYPE_UNSPECIFIED
            .getNumber()) {
      output.writeEnum(6, recordingDeviceType_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(recordingDeviceName_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 7, recordingDeviceName_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(originalMimeType_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 8, originalMimeType_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(audioTopic_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 10, audioTopic_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Description of the content. Eg. "Recordings of federal supreme court
hearings from 2012".
</pre>

<code>string audio_topic = 10;</code>

@return The bytes for audioTopic.
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/RecognitionMetadata.java