Fix setup of route meter point on load, and fix intermittent left-channel-only metering (#3699).

git-svn-id: svn://localhost/ardour2/branches/3.0@8486 d708f5d6-7413-0410-9779-e7cbd77b26cf

4 files changed, 13 insertions, 9 deletions

diff --git a/libs/ardour/ardour/meter.h b/libs/ardour/ardour/meter.h
index 7ff910a91b..e7317f854f 100644
--- a/libs/ardour/ardour/meter.h
+++ b/libs/ardour/ardour/meter.h
@@ -93,7 +93,11 @@ public:
 	
 private:
 	friend class IO;
-	
+
+	/** The number of meters that we are currently handling;
+	 *  may be different to _configured_input and _configured_output
+	 *  as it can be altered outside a ::configure_io by ::reflect_inputs.
+	 */
 	ChanCount current_meters;
 	
 	std::vector<float> _peak_power;
diff --git a/libs/ardour/ardour/route.h b/libs/ardour/ardour/route.h
index 5a6fbd04b6..0bb9b69596 100644
--- a/libs/ardour/ardour/route.h
+++ b/libs/ardour/ardour/route.h
@@ -161,7 +161,7 @@ class Route : public SessionObject, public Automatable, public RouteGroupMember,
 	void set_denormal_protection (bool yn);
 	bool denormal_protection() const;
 
-	void         set_meter_point (MeterPoint);
+	void         set_meter_point (MeterPoint, bool force = false);
 	void         infer_meter_point () const;
 	MeterPoint   meter_point() const { return _meter_point; }
 	void         meter ();
diff --git a/libs/ardour/meter.cc b/libs/ardour/meter.cc
index 226cf417f3..1ea3a090dd 100644
--- a/libs/ardour/meter.cc
+++ b/libs/ardour/meter.cc
@@ -45,8 +45,8 @@ PeakMeter::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_fr
 		return;
 	}
 
-	const uint32_t n_audio = min(_configured_input.n_audio(), bufs.count().n_audio());
-	const uint32_t n_midi  = min(_configured_input.n_midi(), bufs.count().n_midi());
+	const uint32_t n_audio = min (current_meters.n_audio(), bufs.count().n_audio());
+	const uint32_t n_midi  = min (current_meters.n_midi(), bufs.count().n_midi());
 
 	uint32_t n = 0;
 
@@ -129,7 +129,7 @@ PeakMeter::reflect_inputs (const ChanCount& in)
 void
 PeakMeter::reset_max_channels (const ChanCount& chn)
 {
-	uint32_t limit = chn.n_total();
+	uint32_t const limit = chn.n_total();
 
 	while (_peak_power.size() > limit) {
 		_peak_power.pop_back();
diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index 90867940a1..25024b992a 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -1969,7 +1969,7 @@ Route::_set_state (const XMLNode& node, int version, bool /*call_base*/)
 
 	if ((prop = node.property (X_("meter-point"))) != 0) {
 		MeterPoint mp = MeterPoint (string_2_enum (prop->value (), _meter_point));
-                set_meter_point (mp);
+                set_meter_point (mp, true);
 		if (_meter) {
 			_meter->set_display_to_user (_meter_point == MeterCustom);
 		}
@@ -2937,11 +2937,11 @@ Route::flush_processors ()
 }
 
 void
-Route::set_meter_point (MeterPoint p)
+Route::set_meter_point (MeterPoint p, bool force)
 {
 	/* CAN BE CALLED FROM PROCESS CONTEXT */
 
-	if (_meter_point == p) {
+	if (_meter_point == p && !force) {
 		return;
 	}
 
@@ -2981,7 +2981,7 @@ Route::set_meter_point (MeterPoint p)
 			_meter->reflect_inputs (m_in);
 			
 			_processors.insert (loc, _meter);
-			
+
 			/* we do not need to reconfigure the processors, because the meter
 			   (a) is always ready to handle processor_max_streams
 			   (b) is always an N-in/N-out processor, and thus moving