@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_);
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
The audio data bytes encoded as specified in the request. This is
headerless LINEAR16 audio with a sample rate of 24000.
</pre>

<code>bytes audio_content = 1;</code>

@return The audioContent.
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/StreamingSynthesizeResponse.java