rfnoc: Use RTTI "serialization" for stream commands

A small modification to rfnoc::action_info makes it polymorphic, and
instead of serializing data structures into a string, this allows
creating custom action objects and identifying them via RTTI. The stream
command action object is a good example for how to use this, so all the
usages of stream command action objects were converted to this scheme.

1 files changed, 20 insertions, 6 deletions

diff --git a/host/include/uhd/rfnoc/actions.hpp b/host/include/uhd/rfnoc/actions.hpp
index ac454827c..611cb787c 100644
--- a/host/include/uhd/rfnoc/actions.hpp
+++ b/host/include/uhd/rfnoc/actions.hpp
@@ -8,6 +8,8 @@
 #define INCLUDED_LIBUHD_RFNOC_ACTIONS_HPP
 
 #include <uhd/config.hpp>
+#include <uhd/rfnoc/defaults.hpp>
+#include <uhd/types/stream_cmd.hpp>
 #include <string>
 #include <vector>
 #include <memory>
@@ -24,6 +26,8 @@ namespace uhd { namespace rfnoc {
 struct UHD_API action_info
 {
 public:
+    virtual ~action_info() {}
+
     using sptr = std::shared_ptr<action_info>;
     //! A unique counter for this action
     const size_t id;
@@ -34,16 +38,26 @@ public:
     std::vector<uint8_t> payload;
 
     //! Factory function
-    static sptr make(const std::string& key="")
-    {
-        //return std::make_shared<action_info>(key);
-        return sptr(new action_info(key));
-    }
+    static sptr make(const std::string& key="");
 
-private:
+protected:
     action_info(const std::string& key);
 };
 
+struct UHD_API stream_cmd_action_info : public action_info
+{
+public:
+    using sptr = std::shared_ptr<stream_cmd_action_info>;
+
+    uhd::stream_cmd_t stream_cmd;
+
+    //! Factory function
+    static sptr make(const uhd::stream_cmd_t::stream_mode_t stream_mode);
+
+private:
+    stream_cmd_action_info(const uhd::stream_cmd_t::stream_mode_t stream_mode);
+};
+
 }} /* namespace uhd::rfnoc */
 
 #endif /* INCLUDED_LIBUHD_RFNOC_ACTIONS_HPP */