@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!audioContent_.isEmpty()) {
      output.writeBytes(1, audioContent_);
    }
    getUnknownFields().writeTo(output);
  }
<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-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/StreamingSynthesizeResponse.java