From 0ed890033370ae853014f0d34065d9f566e86e54 Mon Sep 17 00:00:00 2001
From: Josh Blum
Date: Sun, 9 Sep 2012 19:41:29 -0700
Subject: simplify forecast and its fail logic

---
 lib/block_handlers.cpp |  2 ++
 lib/block_task.cpp     | 28 +++++++++++-----------------
 lib/element_impl.hpp   |  2 ++
 3 files changed, 15 insertions(+), 17 deletions(-)

(limited to 'lib')

diff --git a/lib/block_handlers.cpp b/lib/block_handlers.cpp
index 73dc20a..d63c1a9 100644
--- a/lib/block_handlers.cpp
+++ b/lib/block_handlers.cpp
@@ -134,6 +134,7 @@ void ElementImpl::topology_update(const tsbe::TaskInterface &task_iface)
     this->work_input_items.resize(num_inputs);
     this->work_output_items.resize(num_outputs);
     this->work_ninput_items.resize(num_inputs);
+    this->fcast_ninput_items.resize(num_inputs);
     this->input_items.resize(num_inputs);
     this->output_items.resize(num_outputs);
     this->consume_items.resize(num_inputs, 0);
@@ -141,6 +142,7 @@ void ElementImpl::topology_update(const tsbe::TaskInterface &task_iface)
     this->input_queues.resize(num_inputs);
     this->output_queues.resize(num_outputs);
     this->output_bytes_offset.resize(num_outputs, 0);
+    this->forecast_enable = not this->enable_fixed_rate;
 
     this->input_tokens.resize(num_inputs);
     this->output_tokens.resize(num_outputs);
diff --git a/lib/block_task.cpp b/lib/block_task.cpp
index 5b3ae00..b9347e8 100644
--- a/lib/block_task.cpp
+++ b/lib/block_task.cpp
@@ -157,26 +157,20 @@ void ElementImpl::handle_task(const tsbe::TaskInterface &task_iface)
     //-- forecast
     //------------------------------------------------------------------
     forecast_again_you_jerk:
-    if (not this->enable_fixed_rate)
+    if (this->forecast_enable)
     {
-        block_ptr->forecast(num_output_items, work_ninput_items);
+        fcast_ninput_items = work_ninput_items;
+        block_ptr->forecast(num_output_items, fcast_ninput_items);
         for (size_t i = 0; i < num_inputs; i++)
         {
-            if (size_t(work_ninput_items[i]) > this->input_items[i].size())
-            {
-                for (size_t j = 0; j < num_inputs; j++)
-                {
-                    work_ninput_items[j] = this->input_items[j]._len;
-                }
-                num_output_items = num_output_items/2;
-                if (num_output_items == 0)
-                {
-                    this->forecast_fail = true;
-                    this->conclusion(task_iface, inputs_done);
-                    return;
-                }
-                goto forecast_again_you_jerk;
-            }
+            if (fcast_ninput_items[i] <= work_ninput_items[i]) continue;
+
+            num_output_items = num_output_items/2; //backoff regime
+            if (num_output_items) goto forecast_again_you_jerk;
+
+            this->forecast_fail = true;
+            this->conclusion(task_iface, inputs_done);
+            return;
         }
     }
     this->forecast_fail = false;
diff --git a/lib/element_impl.hpp b/lib/element_impl.hpp
index cf7f164..6a9c088 100644
--- a/lib/element_impl.hpp
+++ b/lib/element_impl.hpp
@@ -64,6 +64,7 @@ struct ElementImpl
     std::vector<const void *> work_input_items;
     std::vector<void *> work_output_items;
     std::vector<int> work_ninput_items;
+    std::vector<int> fcast_ninput_items;
 
     //work buffers for the new work interface
     Block::InputItems input_items;
@@ -130,6 +131,7 @@ struct ElementImpl
     bool enable_fixed_rate;
     double relative_rate;
     bool forecast_fail;
+    bool forecast_enable;
 };
 
 } //namespace gnuradio
-- 
cgit