+ if (_meter_point == MeterInput) {
+ /* still need input monitoring and metering */
+
+ bool const track_rec = _diskstream->record_enabled ();
+ bool const auto_input = _session.config.get_auto_input ();
+ bool const software_monitor = Config->get_monitoring_model() == SoftwareMonitoring;
+ bool const tape_machine_mode = Config->get_tape_machine_mode ();
+ bool no_meter = false;
+
+ /* this needs a proper K-map
+ * and should be separated into a function similar to monitoring_state()
+ * that also handles roll() states in audio_track.cc, midi_track.cc and route.cc
+ *
+ * see http://www.oofus.co.uk/ardour/Ardour3MonitorModesV3.pdf
+ */
+ if (!auto_input && !track_rec) {
+ no_meter=true;
+ }
+ else if (tape_machine_mode && !track_rec && auto_input) {
+ no_meter=true;
+ }
+ else if (!software_monitor && tape_machine_mode && !track_rec) {
+ no_meter=true;
+ }
+ else if (!software_monitor && !tape_machine_mode && !track_rec && !auto_input) {
+ no_meter=true;
+ }
+
+ if (no_meter) {
+ BufferSet& bufs (_session.get_silent_buffers (n_process_buffers()));
+ _meter->run (bufs, 0, 0, nframes, true);
+ _input->process_input (boost::shared_ptr<Processor>(), start_frame, end_frame, nframes);
+ } else {
+ _input->process_input (_meter, start_frame, end_frame, nframes);
+ }
+ }
+