From bddff8775456313df846b549973a98b4a78e1058 Mon Sep 17 00:00:00 2001
From: Asd-g <65298684+Asd-g@users.noreply.github.com>
Date: Thu, 15 Apr 2021 00:45:30 +0300
Subject: [PATCH] Fix FFSAR_NUM, FFSAR_DEN, FFSAR

---
 CHANGELOG.md        |  3 +++
 src/AVISynthAPI.cpp | 43 ++++++++++++++++++++++++++++++-------------
 src/d2vsource.rc    |  8 ++++----
 3 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f27b266..8e08415 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+##### 1.2.3:
+    Fixed FFSAR_NUM, FFSAR_DEN, FFSAR.
+
 ##### 1.2.2:
     Fixed values of frame properties _Quants* when info=0.
 
diff --git a/src/AVISynthAPI.cpp b/src/AVISynthAPI.cpp
index 858b03a..cbe8790 100644
--- a/src/AVISynthAPI.cpp
+++ b/src/AVISynthAPI.cpp
@@ -33,6 +33,7 @@
 #include <stdexcept>
 #include <malloc.h>
 #include <sstream>
+#include <valarray>
 
 #include "AVISynthAPI.h"
 #include "color_convert.h"
@@ -45,7 +46,7 @@
 #define _MAX_PATH                    PATH_MAX
 #endif
 
-#define VERSION "D2VSource 1.2.2"
+#define VERSION "D2VSource 1.2.3"
 
 bool PutHintingData(uint8_t *video, uint32_t hint)
 {
@@ -266,25 +267,41 @@ D2VSource::D2VSource(const char* d2v, int idct, bool showQ,
     try { env->CheckVersion(8); }
     catch (const AvisynthError&) { has_at_least_v8 = false; }
 
-    std::string ar = d.Aspect_Ratio;
-    std::vector<int> sar;
-    sar.reserve(2);
-    std::stringstream str(ar);
+    std::vector<int> ar;
+    ar.reserve(2);
+    std::stringstream str(d.Aspect_Ratio);
     int n;
     char ch;
     while (str >> n)
     {
         if (str >> ch)
-            sar.push_back(n);
+            ar.push_back(n);
         else
-            sar.push_back(n);
+            ar.push_back(n);
     }
-    int num = sar[0];
-    int den = sar[1];
-    env->SetVar(env->Sprintf("%s", "FFSAR_NUM"), num);
-    env->SetVar(env->Sprintf("%s", "FFSAR_DEN"), den);
-    if (num > 0 && den > 0)
-        env->SetVar(env->Sprintf("%s", "FFSAR"), num / static_cast<double>(den));
+
+    const double sar = ar[0] / static_cast<double>(ar[1]) / (static_cast<double>(vi.width) / vi.height);
+    double decimal_part = sar - static_cast<int>(sar);
+
+    std::valarray<double> vec_1{ double(static_cast<int>(sar)), 1 }, vec_2{ 1,0 }, temporary;
+
+    while (decimal_part > 0.005)
+    {
+        const double new_number = 1 / decimal_part;
+        const double whole_part = static_cast<int>(new_number);
+
+        temporary = vec_1;
+        vec_1 = whole_part * vec_1 + vec_2;
+        vec_2 = temporary;
+
+        decimal_part = new_number - whole_part;
+    }
+
+    env->SetVar(env->Sprintf("%s", "FFSAR_NUM"), static_cast<int>(vec_1[0]));
+    env->SetVar(env->Sprintf("%s", "FFSAR_DEN"), static_cast<int>(vec_1[1]));
+
+    if (vec_1[0] > 0 && vec_1[1] > 0)
+        env->SetVar(env->Sprintf("%s", "FFSAR"), sar);
 }
 
 
diff --git a/src/d2vsource.rc b/src/d2vsource.rc
index ed0b578..528c1df 100644
--- a/src/d2vsource.rc
+++ b/src/d2vsource.rc
@@ -2,8 +2,8 @@
 #include <ntdef.h>
 
 VS_VERSION_INFO VERSIONINFO
-FILEVERSION             1,2,2,0
-PRODUCTVERSION        	1,2,2,0
+FILEVERSION             1,2,3,0
+PRODUCTVERSION        	1,2,3,0
 FILEFLAGSMASK           VS_FFI_FILEFLAGSMASK
 FILEFLAGS               0x0L
 FILEOS                  VOS__WINDOWS32
@@ -16,11 +16,11 @@ BEGIN
         BEGIN
         VALUE "Comments",         "Modified DGDecode."
         VALUE "FileDescription",  "D2VSource for AviSynth 2.6 / AviSynth+"
-        VALUE "FileVersion",      "1.2.2"
+        VALUE "FileVersion",      "1.2.3"
         VALUE "InternalName",     "D2VSource"
         VALUE "OriginalFilename", "D2VSource.dll"
         VALUE "ProductName",      "D2VSource"
-        VALUE "ProductVersion",   "1.2.2"
+        VALUE "ProductVersion",   "1.2.3"
         END
     END
     BLOCK "VarFileInfo"