Make it possible to use sample-exact controls in LADSPA plugins

I don't think we currently have any that would support this functionality, but in case someone has a LADSPA plugin that has audiorate control ports, this allows them to be used with the new sample-exact models
Again... not strictly related to memory management, but since I was in that part of the codebase already...

include/LadspaControl.h

@@ -30,6 +30,7 @@
 
 #include "AutomatableModel.h"
 #include "TempoSyncKnobModel.h"
+#include "ValueBuffer.h"
 
 
 typedef struct PortDescription port_desc_t;
@@ -44,6 +45,7 @@ public:
 	~LadspaControl();
 
 	LADSPA_Data value();
+	ValueBuffer * valueBuffer();
 	void setValue( LADSPA_Data _value );
 	void setLink( bool _state );
 

plugins/LadspaEffect/LadspaEffect.cpp

@@ -38,6 +38,7 @@
 #include "AutomationPattern.h"
 #include "ControllerConnection.h"
 #include "MemoryManager.h"
+#include "ValueBuffer.h"
 
 #include "embed.cpp"
 
@@ -175,18 +176,28 @@ bool LadspaEffect::processAudioBuffer( sampleFrame * _buf,
 					++channel;
 					break;
 				case AUDIO_RATE_INPUT:
-					pp->value = static_cast<LADSPA_Data>( 
-										pp->control->value() / pp->scale );
-					// This only supports control rate ports, so the audio rates are
-					// treated as though they were control rate by setting the
-					// port buffer to all the same value.
-					for( fpp_t frame = 0; 
-						frame < frames; ++frame )
+				{
+					ValueBuffer * vb = pp->control->valueBuffer();
+					if( vb )
 					{
-						pp->buffer[frame] = 
-							pp->value;
+						memcpy( pp->buffer, vb->values(), frames * sizeof(float) );
+					}
+					else
+					{
+						pp->value = static_cast<LADSPA_Data>( 
+											pp->control->value() / pp->scale );
+						// This only supports control rate ports, so the audio rates are
+						// treated as though they were control rate by setting the
+						// port buffer to all the same value.
+						for( fpp_t frame = 0; 
+							frame < frames; ++frame )
+						{
+							pp->buffer[frame] = 
+								pp->value;
+						}
 					}
 					break;
+				}
 				case CONTROL_RATE_INPUT:
 					if( pp->control == NULL )
 					{

src/core/LadspaControl.cpp

@@ -130,6 +130,25 @@ LADSPA_Data LadspaControl::value()
 }
 
 
+ValueBuffer * LadspaControl::valueBuffer()
+{
+	switch( m_port->data_type )
+	{
+		case TOGGLED:
+		case INTEGER:
+			return NULL;
+		case FLOATING:
+			return m_knobModel.valueBuffer();
+		case TIME:
+			return m_tempoSyncKnobModel.valueBuffer();
+		default:
+			qWarning( "LadspaControl::valueBuffer(): BAD BAD BAD\n" );
+			break;
+	}
+
+	return NULL;
+}
+
 
 
 void LadspaControl::setValue( LADSPA_Data _value )