// callback function will be run.
virtual void ExtractMediaMetadata(
const std::string& url,
const std::string& cookies,
const std::string& user_agent,
const ExtractMediaMetadataCB& callback) = 0;
// callback function will be run.
virtual void ExtractMediaMetadata(
const std::string& url,
const std::string& cookies,
const std::string& user_agent,
const ExtractMediaMetadataCB& callback) = 0;