- virtual void pass () = 0;
- virtual void seek (ContentTime time, bool accurate) = 0;
+ boost::shared_ptr<TextDecoder> only_text () const;
+
+ /** Do some decoding and perhaps emit video, audio or subtitle data.
+ * @return true if this decoder will emit no more data unless a seek() happens.
+ */
+ virtual bool pass () = 0;
+ virtual void seek (ContentTime time, bool accurate);