From 5b937b31f75b06488b59a09e5a0f844af782fbd0 Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Wed, 18 Dec 2013 13:05:59 +0000
Subject: video feedback mystery

---
 rotord/src/rotor.h | 44 +++++++++++++++++++++++++++++++++++---------
 1 file changed, 35 insertions(+), 9 deletions(-)

diff --git a/rotord/src/rotor.h b/rotord/src/rotor.h
index f256f66..dc7d737 100644
--- a/rotord/src/rotor.h
+++ b/rotord/src/rotor.h
@@ -119,6 +119,7 @@ inputs: [
 
 #include <unordered_map>
 #include <deque>
+#include <list>
 #include <math.h>
 #include <memory>
 #include <sys/time.h>
@@ -1134,27 +1135,52 @@ namespace Rotor {
 			Video_feedback(){
 				title="Video feedback";
 				description="Repeats output of the last frame";
-				feedback=nullptr;
+				feedbackptr=nullptr;
+				create_parameter("delay","number","number of frames delay","Delay",1.0,0.0,0.0);
 				NODEID="78edfa28-2d0a-11e3-86c7-9f266fabb10c";
 			};
 			Video_feedback(map<string,string> &settings):Video_feedback() {
 				base_settings(settings);
 			};
-			~Video_feedback(){ };
+			~Video_feedback(){};
 			void set_feedback(Image *iptr){
-				feedback=iptr;
+				feedbackptr=iptr;
 			}
+			void init(){
+				feedback.clear();
+				feedbacknums.clear();
+				image.clear();
+			};
 			Image *output(const Frame_spec &frame){
-				if (feedback->RGBdata){
-					return feedback;
+				if (feedbackptr->RGBdata){
+					feedback.push_back(*feedbackptr);
+					feedbacknums.push_back(frame.frame());
+					cerr<<"video feedback: added, "<<feedback.size()<<" images in cache"<<endl;
+					list<Image>::iterator it1=feedback.begin();
+					list<int>::iterator iit1=feedbacknums.begin();
+					if (feedback.size()>((int)parameters["delay"]->value)){
+						if (feedback.size()>((int)parameters["delay"]->value+1)){
+							list<Image>::iterator it2=feedback.begin();
+							list<int>::iterator iit2=feedbacknums.begin();
+							advance(it2,feedback.size()-(((int)parameters["delay"]->value)+1));
+							advance(iit2,feedback.size()-(((int)parameters["delay"]->value)+1));
+							feedback.erase(it1,it2);
+							feedbacknums.erase(iit1,iit2);
+							cerr<<"video feedback: removed, "<<feedback.size()<<" images remain in cache"<<endl;
+							it1=feedback.begin();
+							iit1=feedbacknums.begin();
+						}
+						cerr<<"frame "<<(frame.frame())<<", feedback "<<(*iit1)<<endl;
+						return &(*it1);
+					}
 				}
-				image.setup(frame.w,frame.h);
-				image.clear();
-				return &image;
+				return &image; //will always be black
 			};
 			Video_feedback* clone(map<string,string> &_settings) { return new Video_feedback(_settings);};
 		private:
-			Image *feedback;
+			list<Image> feedback;
+			list<int> feedbacknums;
+			Image *feedbackptr;
 	};
 		//-------------------------------------------------------------------
 	class Node_factory{
-- 
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