+ std::string technical_summary () const;
+
+ virtual std::vector<AudioStreamPtr> audio_streams () const = 0;
+
+ AudioMapping audio_mapping () const;
+ void set_audio_mapping (AudioMapping);
+ int resampled_audio_frame_rate () const;
+ bool has_rate_above_48k () const;
+ std::vector<std::string> audio_channel_names () const;
+
+ void set_audio_gain (double);
+ void set_audio_delay (int);
+
+ double audio_gain () const {
+ boost::mutex::scoped_lock lm (_mutex);
+ return _audio_gain;
+ }
+
+ int audio_delay () const {
+ boost::mutex::scoped_lock lm (_mutex);
+ return _audio_delay;
+ }
+
+ std::string processing_description () const;
+
+protected:
+
+ void add_properties (std::list<UserProperty> &) const;