@java.lang.Override
  public int getSerializedSize() {
    int size = memoizedSize;
    if (size != -1) return size;

    size = 0;
    if (!audioContent_.isEmpty()) {
      size += com.google.protobuf.CodedOutputStream.computeBytesSize(1, audioContent_);
    }
    for (int i = 0; i < timepoints_.size(); i++) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, timepoints_.get(i));
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, getAudioConfig());
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
The audio metadata of `audio_content`.
</pre>

<code>.google.cloud.texttospeech.v1beta1.AudioConfig audio_config = 4;</code>
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesizeSpeechResponse.java