extras/audio plugins/wrapper/formats/VST/juce_VstWrapper.cpp

@@ -618,6 +618,27 @@ public:
             }
             else
             {
+                if (! hasCreatedTempChannels)
+                {
+                    // do this just once when we start processing..
+                    hasCreatedTempChannels = true;
+
+                    // if some output channels are disabled, some hosts supply the same buffer
+                    // for multiple channels - this buggers up our method of copying the
+                    // inputs over the outputs, so we need to create unique temp buffers in this case..
+                    for (int i = 0; i < numOut; ++i)
+                    {
+                        for (int j = i; --j >= 0;)
+                        {
+                            if (outputs[j] == outputs[i] && outputs[i] != 0)
+                            {
+                                tempChannels.set (i, juce_malloc (sizeof (float) * blockSize * 2));
+                                break;
+                            }
+                        }
+                    }
+                }
+
                 {
                     int i;
                     for (i = 0; i < numOut; ++i)
@@ -718,12 +739,6 @@ public:
 
         deleteTempChannels();
 
-        // any inputs where the output channel is disabled will need our own internal dummy
-        // buffer, because we can't rely on the host to supply different buffers for each channel
-        for (int i = 0; i < JucePlugin_MaxNumOutputChannels; ++i)
-            if (! isOutputConnected2 (i))
-                tempChannels.set (i, juce_malloc (sizeof (float) * blockSize * 2));
-
         filter->prepareToPlay (rate, blockSize);
         midiEvents.clear();
 
@@ -1338,6 +1353,7 @@ private:
     int diffW, diffH;
     float** channels;
     VoidArray tempChannels; // see note in processReplacing()
+    bool hasCreatedTempChannels;
 
     void deleteTempChannels()
     {
@@ -1349,6 +1365,8 @@ private:
 
         if (filter != 0)
             tempChannels.insertMultiple (0, 0, filter->getNumInputChannels() + filter->getNumOutputChannels());
+
+        hasCreatedTempChannels = false;
     }
 
     void ensureOutgoingEventSize (int numEvents)
@@ -1384,17 +1402,6 @@ private:
         return host;
     }
 
-    // this is a dupe of the method in AudioEffect, because some SDKs
-    // don't seem to include it..
-    bool isOutputConnected2 (VstInt32 output)
-    {
-        VstInt32 ret = 0;
-        if (audioMaster)
-            ret = (VstInt32) audioMaster (&cEffect, audioMasterPinConnected, output, 1, 0, 0);
-
-        return ret ? false : true;
-    }
-
 #if JUCE_MAC
     WindowRef hostWindow;
 #elif JUCE_LINUX