public com.google.protobuf.ByteString getAtomKeyBytes() {
        java.lang.Object ref = atomKey_;
        if (ref instanceof String) {
          com.google.protobuf.ByteString b =
              com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
          atomKey_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
<pre>
Required. The `EditAtom.key` that references the atom with audio inputs
in the `Job.edit_list`.
</pre>

<code>string atom_key = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for atomKey.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/AudioStream.java