Update sample rate from AU

distrho/src/DistrhoPluginAU.cpp

@@ -221,6 +221,8 @@ protected:
             destBuffer[i] = (float *)outBuffer.mBuffers[i].mData;
         }
 
+        updateSampleRate();
+
         updateParameterInputs();
 
         fPlugin.run(srcBuffer, destBuffer, inFramesToProcess);
@@ -241,6 +243,8 @@ protected:
         if ((err = AUEffectBase::Initialize()) != noErr)
             return err;
 
+        updateSampleRate();
+
         fPlugin.activate();
 
         // FIXME this does not seem right
@@ -312,6 +316,11 @@ private:
         }
     }
 
+    void updateSampleRate()
+    {
+        d_lastSampleRate = GetSampleRate();
+    }
+
     DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PluginAU)
 };