private void ensureDvrWindowsIsMutable() {
      if (!((bitField0_ & 0x00000080) != 0)) {
        dvrWindows_ =
            new java.util.ArrayList<com.google.cloud.video.livestream.v1.DvrSession.DvrWindow>(
                dvrWindows_);
        bitField0_ |= 0x00000080;
      }
    }
<pre>
Required. A list of DVR manifests. Currently only one DVR manifest is
allowed.
</pre>

<code>
repeated .google.cloud.video.livestream.v1.DvrSession.DvrManifest dvr_manifests = 7 [(.google.api.field_behavior) = REQUIRED];
</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/DvrSession.java