Revert "Basic multiplatform (#218)" (#226)

This reverts commit d2fc566.

Author: Ruslan-B

.gitignore

@@ -105,9 +105,5 @@ UpgradeLog*.XML
 
 *.stackdump
 
-# JetBrains Rider
-.idea/
-*.sln.iml
-
 # Local 
 /FFmpeg.AutoGen.Example/frame.*.jpg

FFmpeg.AutoGen/FFmpeg.AutoGen.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netstandard2.1;netstandard2.0;net472;net45</TargetFrameworks>
+    <TargetFrameworks>netstandard2.1;netstandard2.0;net472;net45</TargetFrameworks>
     <GeneratePackageOnBuild Condition=" $(Configuration) == 'Release' ">true</GeneratePackageOnBuild>
     <Description>FFmpeg auto generated unsafe bindings for C#/.NET and Mono.</Description>
   </PropertyGroup>

FFmpeg.AutoGen/FFmpeg.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Runtime.InteropServices;
 using FFmpeg.AutoGen.Native;
 
 namespace FFmpeg.AutoGen
@@ -39,23 +38,11 @@ static ffmpeg()
         {
             GetOrLoadLibrary = libraryName => LoadLibrary(libraryName, true);
 
-#if NET
-            //BSD has #define EAGAIN 35 in errno.h, other OS have EAGAIN 11. Apple is based on BSD 
-            bool bsdStyleErrno =
-                OperatingSystem.IsFreeBSD()
-                || OperatingSystem.IsMacCatalyst()
-                || OperatingSystem.IsMacOS()
-                || OperatingSystem.IsIOS()
-                || OperatingSystem.IsTvOS()
-                || OperatingSystem.IsWatchOS();
-            EAGAIN = bsdStyleErrno ? 35 : 11;
-#else
             EAGAIN = LibraryLoader.GetPlatformId() switch
             {
                 PlatformID.MacOSX => 35,
                 _ => 11
             };
-#endif
         }
 
         /// <summary>

FFmpeg.AutoGen/Native/LibraryLoader.cs

@@ -4,7 +4,7 @@
 
 namespace FFmpeg.AutoGen.Native
 {
-    public delegate PlatformID? GetPlatformId();
+    public delegate PlatformID GetPlatformId();
 
     public delegate string GetNativeLibraryName(string libraryName, int version);
 
@@ -16,23 +16,11 @@ static LibraryLoader()
             {
 #if NET45 || NET40
                 return Environment.OSVersion.Platform;
-#elif NET
-                if (OperatingSystem.IsWindows())
-                    return PlatformID.Win32NT;
-                if (OperatingSystem.IsMacCatalyst()
-                    || OperatingSystem.IsMacOS()
-                    || OperatingSystem.IsIOS()
-                    || OperatingSystem.IsTvOS()
-                    || OperatingSystem.IsWatchOS())
-                    return PlatformID.MacOSX; // all share similar .dylib calling style. But only static libs on iOS store apps!
-                if (OperatingSystem.IsAndroid() || OperatingSystem.IsFreeBSD() || OperatingSystem.IsLinux())
-                    return PlatformID.Unix;
-                return null;
 #else
                 if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) return PlatformID.Win32NT;
                 if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux)) return PlatformID.Unix;
                 if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX)) return PlatformID.MacOSX;
-                return null;
+                throw new PlatformNotSupportedException();
 #endif
             };