public com.google.cloud.video.livestream.v1.InputAttachment.Builder addInputAttachmentsBuilder(
        int index) {
      return getInputAttachmentsFieldBuilder()
          .addBuilder(
              index, com.google.cloud.video.livestream.v1.InputAttachment.getDefaultInstance());
    }
<pre>
A list of input attachments that this channel uses.
One channel can have multiple inputs as the input sources. Only one
input can be selected as the input source at one time.
</pre>

<code>repeated .google.cloud.video.livestream.v1.InputAttachment input_attachments = 16;
</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/Channel.java