virtual int content_audio_frame_rate () const = 0;
virtual int output_audio_frame_rate () const = 0;
virtual AudioMapping audio_mapping () const = 0;
virtual void set_audio_mapping (AudioMapping) = 0;
virtual int content_audio_frame_rate () const = 0;
virtual int output_audio_frame_rate () const = 0;
virtual AudioMapping audio_mapping () const = 0;
virtual void set_audio_mapping (AudioMapping) = 0;