public Builder setTimepoints(int index, com.google.cloud.texttospeech.v1beta1.Timepoint value) {
      if (timepointsBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureTimepointsIsMutable();
        timepoints_.set(index, value);
        onChanged();
      } else {
        timepointsBuilder_.setMessage(index, value);
      }
      return this;
    }
<pre>
A link between a position in the original request input and a corresponding
time in the output audio. It's only supported via `&lt;mark&gt;` of SSML input.
</pre>

<code>repeated .google.cloud.texttospeech.v1beta1.Timepoint timepoints = 2;</code>
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/SynthesizeSpeechResponse.java