@java.lang.Override
    public com.google.protobuf.ByteString
        getFormatBytes() {
      java.lang.Object ref = format_;
      if (ref instanceof java.lang.String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8(
                (java.lang.String) ref);
        format_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
avi, jpg, youtube, cnbc, audio/mpeg formats ...
</pre>

<code>string format = 5;</code>
@return The bytes for format.
benchmark/src/main/java/com/alibaba/fastjson2/benchmark/protobuf/MediaContentHolder.java