@java.lang.Override
  public com.google.protobuf.ByteString getActiveInputBytes() {
    java.lang.Object ref = activeInput_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      activeInput_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
Output only. The
[InputAttachment.key][google.cloud.video.livestream.v1.InputAttachment.key]
that serves as the current input source. The first input in the
[input_attachments][google.cloud.video.livestream.v1.Channel.input_attachments]
is the initial input source.
</pre>

<code>string active_input = 6 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The bytes for activeInput.
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/Channel.java