implemented a footage viewer

Essentially a minor derivation of a viewer type that can automatically view
footage from the project (i.e. not in a sequence).

app/node/audio/pan/pan.cpp

@@ -50,15 +50,17 @@ void PanNode::ProcessSamples(const NodeValueDatabase *values, const AudioRenderi
 
   float pan_val = (*values)[panning_input_].Get(NodeParam::kFloat).toFloat();
 
+  output[index] = input[index];
+
   if (index%2 == 0) {
     // Sample is left channel
     if (pan_val > 0) {
-      output[index] = input[index] * (1.0F - pan_val);
+      output[index] *= (1.0F - pan_val);
     }
   } else {
     // Sample is right channel
     if (pan_val < 0) {
-      output[index] = input[index] * (1.0F - qAbs(pan_val));
+      output[index] *= (1.0F - qAbs(pan_val));
     }
   }
 }

app/node/input/media/media.cpp

@@ -20,6 +20,8 @@
 
 #include "media.h"
 
+#include "common/timecodefunctions.h"
+
 MediaInput::MediaInput() :
   connected_footage_(nullptr)
 {
@@ -45,6 +47,20 @@ void MediaInput::Retranslate()
   footage_input_->set_name(tr("Footage"));
 }
 
+NodeValueTable MediaInput::Value(const NodeValueDatabase &value) const
+{
+  NodeValueTable table = value.Merge();
+
+  if (connected_footage_) {
+    rational media_duration = Timecode::timestamp_to_time(connected_footage_->duration(),
+                                                          connected_footage_->timebase());
+
+    table.Push(NodeInput::kRational, QVariant::fromValue(media_duration), "length");
+  }
+
+  return table;
+}
+
 void MediaInput::FootageChanged()
 {
   StreamPtr new_footage = footage_input_->get_standard_value().value<StreamPtr>();

app/node/input/media/media.h

@@ -38,6 +38,8 @@ public:
 
   virtual void Retranslate() override;
 
+  virtual NodeValueTable Value(const NodeValueDatabase& value) const override;
+
 protected:
   NodeInput* footage_input_;
 

app/node/output/timeline/timeline.cpp

@@ -98,7 +98,7 @@ const rational &TimelineOutput::timebase() const
 NodeValueTable TimelineOutput::Value(const NodeValueDatabase &value) const
 {
   NodeValueTable table = value.Merge();
-  table.Push(NodeParam::kRational, QVariant::fromValue(length()));
+  table.Push(NodeParam::kRational, QVariant::fromValue(length()), "length");
   return table;
 }
 

app/node/output/viewer/viewer.cpp

@@ -119,7 +119,7 @@ rational ViewerOutput::Length()
   Node* connected_node = length_input_->get_connected_node();
 
   if (connected_node) {
-    return connected_node->Value(NodeValueDatabase()).Get(NodeParam::kNumber).value<rational>();
+    return connected_node->Value(NodeValueDatabase()).Get(NodeParam::kNumber, "length").value<rational>();
   }
 
   return 0;

app/node/param.cpp

@@ -65,7 +65,7 @@ void NodeParam::set_name(const QString &name)
   name_ = name;
 }
 
-Node *NodeParam::parentNode()
+Node *NodeParam::parentNode() const
 {
   QObject* p = parent();
 
@@ -87,7 +87,7 @@ int NodeParam::index()
   return parentNode()->IndexOfParameter(this);
 }
 
-bool NodeParam::IsConnected()
+bool NodeParam::IsConnected() const
 {
   return !edges_.isEmpty();
 }

app/node/param.h

@@ -254,7 +254,7 @@ public:
    * Nodes and NodeParams use the QObject parent-child system. This function is a convenience function for
    * static_cast<Node*>(QObject::parent())
    */
-  Node* parentNode();
+  Node* parentNode() const;
 
   /**
    * @brief Return the row index of this parameter in the parent node (primarily used for UI drawing functions)
@@ -264,7 +264,7 @@ public:
   /**
    * @brief Returns whether anything is connected to this parameter or not
    */
-  bool IsConnected();
+  bool IsConnected() const;
 
   bool IsConnectable() const;
   void SetConnectable(bool connectable);