1 files changed, 30 insertions, 6 deletions
diff --git a/include/gras/block.hpp b/include/gras/block.hpp
index c33f7f9..f00a6f7 100644
--- a/include/gras/block.hpp
+++ b/include/gras/block.hpp
@@ -109,6 +109,22 @@ struct GRAS_API Block : Element
     Block(const std::string &name);
 
     /*******************************************************************
+     * Item sizes for ports
+     ******************************************************************/
+
+    //! Get the input item size for this port in bytes
+    size_t get_input_size(const size_t which_input) const;
+
+    //! Set the input item size for this port in bytes
+    void set_input_size(const size_t which_input, const size_t bytes);
+
+    //! Get the output item size for this port in bytes
+    size_t get_output_size(const size_t which_output) const;
+
+    //! Set the output item size for this port in bytes
+    void set_output_size(const size_t which_output, const size_t bytes);
+
+    /*******************************************************************
      * Deal with input and output port configuration
      ******************************************************************/
 
@@ -204,12 +220,6 @@ struct GRAS_API Block : Element
      * Work related routines and fail states
      ******************************************************************/
 
-    //! Called when the flow graph is started, can overload
-    virtual bool start(void);
-
-    //! Called when the flow graph is stopped, can overload
-    virtual bool stop(void);
-
     typedef WorkBufferArray<const void *> InputItems;
     typedef WorkBufferArray<void *> OutputItems;
 
@@ -308,6 +318,20 @@ struct GRAS_API Block : Element
     void post_output_buffer(const size_t which_output, const SBuffer &buffer);
 
     /*!
+     * Overload notify_active to get called when block becomes active.
+     * This will be called when the TopBlock start/run API call executes.
+     * The default implementation of notify_active is a NOP.
+     */
+    virtual void notify_active(void);
+
+    /*!
+     * Overload notify_inactive to get called when block becomes inactive.
+     * This will be called when the TopBlock stop/run API call executes.
+     * The default implementation of notify_inactive is a NOP.
+     */
+    virtual void notify_inactive(void);
+
+    /*!
      * Overload notify_topology to get called on topological changes.
      * Use notify_topology to perform one-time resizing operations
      * to avoid a conditional resizing operation inside the work().