Fix for some juce-based plugins having 0 audio ports

Closes #1084

Signed-off-by: falkTX <falktx@falktx.com>

source/backend/plugin/CarlaPluginJuce.cpp

@@ -438,6 +438,7 @@ public:
 
         clearBuffers();
 
+        fInstance->enableAllBuses();
         fInstance->refreshParameterList();
 
         uint32_t aIns, aOuts, mIns, mOuts, params;
@@ -446,9 +447,9 @@ public:
         bool needsCtrlIn, needsCtrlOut;
         needsCtrlIn = needsCtrlOut = false;
 
-        aIns   = (fInstance->getTotalNumInputChannels() > 0)  ? static_cast<uint32_t>(fInstance->getTotalNumInputChannels())  : 0;
-        aOuts  = (fInstance->getTotalNumOutputChannels() > 0) ? static_cast<uint32_t>(fInstance->getTotalNumOutputChannels()) : 0;
-        params = (fInstance->getNumParameters() > 0)          ? static_cast<uint32_t>(fInstance->getNumParameters())          : 0;
+        aIns   = std::max(fInstance->getTotalNumInputChannels(), 0);
+        aOuts  = std::max(fInstance->getTotalNumOutputChannels(), 0);
+        params = std::max(fInstance->getNumParameters(), 0);
 
         if (fInstance->acceptsMidi())
         {

source/discovery/carla-discovery.cpp

@@ -1457,8 +1457,12 @@ static void do_juce_check(const char* const filename_, const char* const stype,
             {
                 carla_juce_idle();
 
+                instance->enableAllBuses();
                 instance->refreshParameterList();
 
+                audioIns = instance->getTotalNumInputChannels();
+                audioOuts = instance->getTotalNumOutputChannels();
+
                 parameters = instance->getParameters().size();
 
                 if (instance->hasEditor())