some ripple behavior fixes

app/node/block/block.cpp

@@ -64,6 +64,8 @@ const rational& Block::length()
 
 void Block::set_length(const rational &length)
 {
+  Q_ASSERT(length > 0);
+
   Lock();
 
   length_ = length;
@@ -177,6 +179,16 @@ void Block::set_media_in(const rational &media_in)
   }
 }
 
+const QString &Block::block_name()
+{
+  return block_name_;
+}
+
+void Block::set_block_name(const QString &name)
+{
+  block_name_ = name;
+}
+
 rational Block::SequenceToMediaTime(const rational &sequence_time)
 {
   // These constants are not considered "values" per se, so we don't modify them

app/node/block/block.h

@@ -67,6 +67,9 @@ public:
   const rational& media_in();
   void set_media_in(const rational& media_in);
 
+  const QString& block_name();
+  void set_block_name(const QString& name);
+
 public slots:
   /**
    * @brief Refreshes internal cache of in/out points up to date
@@ -113,6 +116,8 @@ private:
 
   Block* next_;
 
+  QString block_name_;
+
 private slots:
   void EdgeAddedSlot(NodeEdgePtr edge);
 

app/node/output/track/track.cpp

@@ -147,6 +147,18 @@ NodeOutput* TrackOutput::track_output()
   return track_output_;
 }
 
+Block *TrackOutput::NearestBlockBefore(const rational &time)
+{
+  foreach (Block* block, block_cache_) {
+    // Blocks are sorted by time, so the first Block who's out point is at/after this time is the correct Block
+    if (block->out() >= time) {
+      return block;
+    }
+  }
+
+  return nullptr;
+}
+
 Block *TrackOutput::NearestBlockAfter(const rational &time)
 {
   foreach (Block* block, block_cache_) {

app/node/output/track/track.h

@@ -59,6 +59,8 @@ public:
 
   NodeOutput* track_output();
 
+  Block* NearestBlockBefore(const rational& time);
+
   Block* NearestBlockAfter(const rational& time);
 
   const QVector<Block*>& Blocks();