796781d4c3
The interface requires the implementation to return null if the decode-only flag is set. So instead of setting the flag and returning null, we can simply not call the method and assume it's null. The only reason where this wouldn't work is if the metadata format has keyframe-like logic and requires previous metadata to decode the next one. This is not something we came across before and it seems ignorable. If that feature is needed in the future, we should instead add a method to MetadataDecoder to set the first output timestamp. #minor-release PiperOrigin-RevId: 570399838