From 337eba1403140ab69fc60b69c2d8d2a24e199dc1 Mon Sep 17 00:00:00 2001
From: Eran <librealsense.eran@gmail.com>
Date: Thu, 26 Oct 2023 22:03:45 +0300
Subject: [PATCH] remove exposure & discrete value handling in actual FPS
 calculations

---
 src/ds/ds-color-common.cpp |  3 +-
 src/metadata-parser.h      | 58 ++------------------------------------
 2 files changed, 4 insertions(+), 57 deletions(-)

diff --git a/src/ds/ds-color-common.cpp b/src/ds/ds-color-common.cpp
index bfc0d571703..e12f6fc11ad 100644
--- a/src/ds/ds-color-common.cpp
+++ b/src/ds/ds-color-common.cpp
@@ -77,8 +77,7 @@ namespace librealsense
     void ds_color_common::register_metadata()
     {
         _color_ep.register_metadata(RS2_FRAME_METADATA_FRAME_TIMESTAMP, make_uvc_header_parser(&platform::uvc_header::timestamp));
-        _color_ep.register_metadata(RS2_FRAME_METADATA_ACTUAL_FPS, std::make_shared<ds_md_attribute_actual_fps>(false, [](const rs2_metadata_type& param)
-            {return param * 100; })); //the units of the exposure of the RGB sensor are 100 microseconds so the md_attribute_actual_fps need the lambda to convert it to microseconds
+        _color_ep.register_metadata(RS2_FRAME_METADATA_ACTUAL_FPS, std::make_shared<ds_md_attribute_actual_fps>());
 
         // attributes of md_capture_timing
         auto md_prop_offset = offsetof(metadata_raw, mode) +
diff --git a/src/metadata-parser.h b/src/metadata-parser.h
index 3bd06d3c0a0..2825aef256e 100644
--- a/src/metadata-parser.h
+++ b/src/metadata-parser.h
@@ -345,7 +345,7 @@ namespace librealsense
     class actual_fps_calculator
     {
     public:
-        double get_fps(const librealsense::frame & frm)
+        static double get_fps( const librealsense::frame & frm )
         {
             // A computation involving unsigned operands can never overflow (ISO/IEC 9899:1999 (E) \A76.2.5/9)
             // In case of frame counter reset fallback use fps from the stream configuration
@@ -373,67 +373,15 @@ namespace librealsense
     class ds_md_attribute_actual_fps : public md_attribute_parser_base
     {
     public:
-        ds_md_attribute_actual_fps(bool discrete = true, attrib_modifyer  exposure_mod = [](const rs2_metadata_type& param) {return param; })
-            : _fps_values{ 6, 15, 30, 60, 90 } , _exposure_modifyer(exposure_mod), _discrete(discrete)
-        {}
-
-        rs2_metadata_type get(const librealsense::frame & frm) const override
+        rs2_metadata_type get( const librealsense::frame & frm ) const override
         {
-            if (frm.supports_frame_metadata(RS2_FRAME_METADATA_ACTUAL_EXPOSURE))
-            {
-                if (frm.get_stream()->get_format() == RS2_FORMAT_Y16 &&
-                    frm.get_stream()->get_stream_type() == RS2_STREAM_INFRARED) //calibration mode
-                {
-                    if (std::find(_fps_values.begin(), _fps_values.end(), 25) == _fps_values.end())
-                    {
-                        _fps_values.push_back(25);
-                        std::sort(_fps_values.begin(), _fps_values.end());
-                    }
-
-                }
-
-                auto exp = frm.get_frame_metadata(RS2_FRAME_METADATA_ACTUAL_EXPOSURE);
-
-                auto exp_in_micro = _exposure_modifyer(exp);
-                if (exp_in_micro > 0)
-                {
-                    auto fps = 1000000. / exp_in_micro;
-
-                    if (_discrete)
-                    {
-                        if (fps >= _fps_values.back())
-                        {
-                            fps = static_cast<double>(_fps_values.back());
-                        }
-                        else
-                        {
-                            for (size_t i = 0; i < _fps_values.size() - 1; i++)
-                            {
-                                if (fps < _fps_values[i + 1])
-                                {
-                                    fps = static_cast<double>(_fps_values[i]);
-                                    break;
-                                }
-                            }
-                        }
-                    }
-                    return rs2_metadata_type( std::min( fps, (double)frm.get_stream()->get_framerate() ) * 1000 );
-                }
-            }
-
-            return rs2_metadata_type( _fps_calculator.get_fps( frm ) * 1000 );
+            return rs2_metadata_type( actual_fps_calculator::get_fps( frm ) * 1000 );
         }
 
         bool supports(const librealsense::frame & frm) const override
         {
             return true;
         }
-
-    private:
-        mutable actual_fps_calculator _fps_calculator;
-        mutable std::vector<uint32_t> _fps_values;
-        attrib_modifyer _exposure_modifyer;
-        bool _discrete;
     };
 
     /**\brief A helper function to create a specialized parser for RS4xx sensor timestamp*/