public Builder setStreamingAudioConfig(
        com.google.cloud.texttospeech.v1.StreamingAudioConfig.Builder builderForValue) {
      if (streamingAudioConfigBuilder_ == null) {
        streamingAudioConfig_ = builderForValue.build();
      } else {
        streamingAudioConfigBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Optional. The configuration of the synthesized audio.
</pre>

<code>
.google.cloud.texttospeech.v1.StreamingAudioConfig streaming_audio_config = 4 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/StreamingSynthesizeConfig.java