private com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.cloud.texttospeech.v1beta1.Timepoint,
            com.google.cloud.texttospeech.v1beta1.Timepoint.Builder,
            com.google.cloud.texttospeech.v1beta1.TimepointOrBuilder>
        getTimepointsFieldBuilder() {
      if (timepointsBuilder_ == null) {
        timepointsBuilder_ =
            new com.google.protobuf.RepeatedFieldBuilderV3<
                com.google.cloud.texttospeech.v1beta1.Timepoint,
                com.google.cloud.texttospeech.v1beta1.Timepoint.Builder,
                com.google.cloud.texttospeech.v1beta1.TimepointOrBuilder>(
                timepoints_, ((bitField0_ & 0x00000002) != 0), getParentForChildren(), isClean());
        timepoints_ = null;
      }
      return timepointsBuilder_;
    }
<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