Filter SDK/DualPlugins

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−
There are three ways to make 2.6 plugins (that is plugins compiled with plugin api v5 or higher) work with AviSynth 2.5, provided that you use the 2.5 feature set. They are described here below.
+
There are three ways to make dual plugins. That is 2.6 plugins (compiled with plugin api v5) that also work with AviSynth 2.5. They are described here below.
 +
 
 +
== The InvertNeg example ==
 +
 
 +
For InvertNeg it's straightforward to make it as a dual plugin, since the code uses the 2.5 feature set. When using the 2.5+ feature set it becomes more elaborate (and it might not always be possible). See Simplesample for such an example.
  
 
=== Brute force solution one ===
 
=== Brute force solution one ===
Line 5: Line 9:
 
This solution doubles all the code. You need to rename avisynth.h (v3) to avisynth25.h and avisynth.h (v5) to avisynth26.h and add them both to your project. You also need to add the following two source files to your project:
 
This solution doubles all the code. You need to rename avisynth.h (v3) to avisynth25.h and avisynth.h (v5) to avisynth26.h and add them both to your project. You also need to add the following two source files to your project:
  
−
'''InvertNeg25.cpp'''
+
/* InvertNeg25.cpp */
−
 
+
 
  #include <windows.h>
 
  #include <windows.h>
 
  #include "avisynth25.h"
 
  #include "avisynth25.h"
Line 64: Line 68:
 
  }
 
  }
  
−
 
+
/* InvertNeg26.cpp */
−
'''InvertNeg26.cpp'''
+
−
 
+
 
  #include <windows.h>
 
  #include <windows.h>
 
  #include "avisynth26.h"
 
  #include "avisynth26.h"
Line 129: Line 132:
 
Note that both functions Create_InvertNeg25 and Create_InvertNeg26 are added in the function table (by AddFunction) as InvertNeg. Which one is called by your script will be decided by the AvisynthPluginInit2 and AvisynthPluginInit3 entry points (and thus your AviSynth version).
 
Note that both functions Create_InvertNeg25 and Create_InvertNeg26 are added in the function table (by AddFunction) as InvertNeg. Which one is called by your script will be decided by the AvisynthPluginInit2 and AvisynthPluginInit3 entry points (and thus your AviSynth version).
  
−
Compile both files into a DLL named InvertNeg.dll. See [[Filter_SDK/Compiling_instructions|compiling instructions]]. Now create an Avisynth script which looks something like this:
+
Compile both files into a DLL named InvertNeg.dll. See [[Filter_SDK/Compiling_instructions|compiling instructions]]. Now create an AviSynth script which looks something like this:
  
 
  LoadPlugin("d:\path\InvertNeg.dll")
 
  LoadPlugin("d:\path\InvertNeg.dll")
Line 135: Line 138:
 
  return clip.InvertNeg()
 
  return clip.InvertNeg()
  
−
It should work both for AviSynth 2.5 and 2.6.
+
The script should work both for AviSynth 2.5 and 2.6.
  
 
=== Brute force solution two ===
 
=== Brute force solution two ===
Line 145: Line 148:
 
  /* InvertNeg.cpp */
 
  /* InvertNeg.cpp */
 
   
 
   
−
  include <windows.h>
+
  #include <windows.h>
 
   
 
   
 
  namespace avs25 {
 
  namespace avs25 {
Line 151: Line 154:
 
     #include "InvertNeg.hpp"
 
     #include "InvertNeg.hpp"
 
  }
 
  }
 +
 
 +
#undef __AVISYNTH_H__ // name must not be included twice in the inclusions
 
   
 
   
 
  namespace avs26 {
 
  namespace avs26 {
Line 156: Line 161:
 
     const AVS_Linkage *AVS_linkage = 0;
 
     const AVS_Linkage *AVS_linkage = 0;
 
     #include "InvertNeg.hpp"
 
     #include "InvertNeg.hpp"
 +
}
 +
 +
extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(avs25::IScriptEnvironment* env) {
 +
    env->AddFunction("InvertNeg", "c", avs25::Create_InvertNeg, 0);
 +
    return "InvertNeg sample plugin";
 
  }
 
  }
 
   
 
   
Line 163: Line 173:
 
     return "InvertNeg sample plugin";
 
     return "InvertNeg sample plugin";
 
  }
 
  }
−
 
−
extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(avs25::IScriptEnvironment* env) {
 
−
    env->AddFunction("InvertNeg", "c", avs25::Create_InvertNeg, 0);
 
−
    return "InvertNeg sample plugin";
 
−
}
 
−
 
  
 
  /* InvertNeg.hpp */
 
  /* InvertNeg.hpp */
Line 221: Line 225:
 
  }
 
  }
  
−
Compile this file into a DLL named InvertNeg.dll. See [[Filter_SDK/Compiling_instructions|compiling instructions]]. Now create an Avisynth script which looks something like this:
+
Compile this file into a DLL named InvertNeg.dll. See [[Filter_SDK/Compiling_instructions|compiling instructions]]. Now create an AviSynth script which looks something like this:
  
 
  LoadPlugin("d:\path\InvertNeg.dll")
 
  LoadPlugin("d:\path\InvertNeg.dll")
 
  clip = BlankClip().ConvertToYV12()
 
  clip = BlankClip().ConvertToYV12()
 
  return clip.InvertNeg()
 
  return clip.InvertNeg()
−
 
−
TODO: try it out!!!
 
−
 
−
http://forum.doom9.org/showthread.php?p=1641372#post1641372
 
  
 
=== xxx ===
 
=== xxx ===
  
 
http://forum.doom9.org/showthread.php?p=1641346#post1641346 and subsequent posts ....
 
http://forum.doom9.org/showthread.php?p=1641346#post1641346 and subsequent posts ....
 +
 +
== The SimpleSample example ==
 +
 +
The SimpleSample code uses the 2.5+ feature set, since it uses GetPlaneWidthSubsampling and GetPlaneHeightSubsampling. These are functions of [[Filter_SDK/Cplusplus_API/VideoInfo|VideoInfo]]. One way to get it to work is to add these functions in avisynth25.h in the [[Filter_SDK/Cplusplus_API/VideoInfo|VideoInfo]] structure. Note that in this case they are only used for YV12:
 +
 +
/* avisynth25.h */
 +
 +
struct VideoInfo {
 +
  ...
 +
  // mimics 2.6 functionality for YV12
 +
  int GetPlaneWidthSubsampling(int plane) const {
 +
    switch(plane) {
 +
    case PLANAR_Y:
 +
      return 0;
 +
    case PLANAR_U:
 +
      return 1;
 +
    case PLANAR_V:
 +
      return 1;
 +
    default:
 +
      return 0;
 +
    }
 +
  }
 +
 
 +
  int GetPlaneHeightSubsampling(int plane) const {
 +
    switch(plane) {
 +
    case PLANAR_Y:
 +
      return 0;
 +
    case PLANAR_U:
 +
      return 1;
 +
    case PLANAR_V:
 +
      return 1;
 +
    default:
 +
      return 0;
 +
    }
 +
  }
 +
};
 +
 +
Now we can place all the filter generic code into a separate file, "simplesample.hpp", #include it twice, and access object names as avs25::name or avs26::name.
 +
 +
/* simplesample.cpp */
 +
 +
/*
 +
SimpleSample plugin for Avisynth -- a simple sample
 +
 +
Copyright (C) 2002-2013 Simon Walters, Wilbert Dijkhof, All Rights Reserved
 +
 +
This program is free software; you can redistribute it and/or modify
 +
it under the terms of the GNU General Public License as published by
 +
the Free Software Foundation.
 +
 +
This program is distributed in the hope that it will be useful,
 +
but WITHOUT ANY WARRANTY; without even the implied warranty of
 +
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 +
GNU General Public License for more details.
 +
 +
You should have received a copy of the GNU General Public License
 +
along with this program; if not, write to the Free Software
 +
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 +
 +
The author can be contacted at:
 +
wilbertdijkhof at yahoo.com
 +
 +
v2.0 - AviSynth 2.6 api (based on v1.6 of Simon Walters)
 +
v2.1 - Dual plugin for 2.5 and 2.6
 +
*/
 +
 +
#include <windows.h>
 +
 +
namespace avs25 {
 +
  #include "avisynth25.h"
 +
  #include "simplesample.hpp"
 +
}
 +
 
 +
#undef __AVISYNTH_H__ // name must not be included twice in the inclusions
 +
 +
namespace avs26 {
 +
  #include "avisynth26.h"
 +
  const AVS_Linkage *AVS_linkage = 0;
 +
  #include "simplesample.hpp"
 +
}
 +
 +
extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(avs25::IScriptEnvironment* env) {
 +
  env->AddFunction("SimpleSample", "c[size]i", avs25::Create_SimpleSample, 0);
 +
  return "SimpleSample plugin";
 +
}
 +
 +
extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit3(avs26::IScriptEnvironment* env, const avs26::AVS_Linkage* const vectors) {
 +
  avs26::AVS_linkage = vectors;
 +
  env->AddFunction("SimpleSample", "c[size]i", avs26::Create_SimpleSample, 0);
 +
  return "SimpleSample plugin";
 +
}
 +
 +
 +
/* simplesample.hpp */
 +
 +
class SimpleSample : public GenericVideoFilter {
 +
    int SquareSize;
 +
public:
 +
    SimpleSample(PClip _child, int _SquareSize, IScriptEnvironment* env);
 +
    ~SimpleSample();
 +
    PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* env);
 +
};
 +
 +
SimpleSample::SimpleSample(PClip _child, int _SquareSize, IScriptEnvironment* env) :
 +
    GenericVideoFilter(_child), SquareSize(_SquareSize) {
 +
    if (vi.width<SquareSize || vi.height<SquareSize) {
 +
      env->ThrowError("SimpleSample: square doesn't fit into the clip!");
 +
    }
 +
}
 +
 +
SimpleSample::~SimpleSample() {}
 +
 +
PVideoFrame __stdcall SimpleSample::GetFrame(int n, IScriptEnvironment* env) {
 +
 +
    PVideoFrame src = child->GetFrame(n, env);
 +
    env->MakeWritable(&src);
 +
 +
    unsigned char* srcp = src->GetWritePtr();
 +
    int src_pitch = src->GetPitch();
 +
    int src_width = src->GetRowSize();
 +
    int src_height = src->GetHeight();
 +
 +
    int w, h, woffset;
 +
 +
    if (vi.IsRGB24()) {
 +
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch;
 +
 +
      woffset = src_width/2 - 3*SquareSize/2;
 +
 +
      for (h=0; h<SquareSize; h++) {
 +
          for (w=0; w<3*SquareSize; w+=3) {
 +
            *(srcp + woffset + w) = 255;
 +
            *(srcp + woffset + w + 1) = 255;
 +
            *(srcp + woffset + w + 2) = 255;
 +
          }
 +
          srcp += src_pitch;
 +
      }
 +
    }
 +
    if (vi.IsRGB32()) {
 +
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch;
 +
 +
      woffset = src_width/2 - 4*SquareSize/2;
 +
 +
      for (h=0; h<SquareSize; h++) {
 +
          for (w=0; w<4*SquareSize; w+=4) {
 +
            *(srcp + woffset + w) = 255;
 +
            *(srcp + woffset + w + 1) = 255;
 +
            *(srcp + woffset + w + 2) = 255;
 +
          }
 +
          srcp += src_pitch;
 +
      }
 +
    }
 +
/*
 +
    if (vi.IsRGB32()) { // variant 1 - processing a pixel at once
 +
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch;
 +
 +
      woffset = src_width/8 - SquareSize/2;
 +
 +
      for (h=0; h<SquareSize; h++) {
 +
          for (w=0; w<SquareSize; w++) {
 +
            *((unsigned int *)srcp + woffset + w) = 0x00FFFFFF;
 +
          }
 +
          srcp += src_pitch;
 +
      }
 +
    }
 +
*/
 +
/*
 +
    if (vi.IsRGB32()) { // variant 2 - processing a pixel at once
 +
      unsigned int* srcp = (unsigned int*)src->GetWritePtr();
 +
 +
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch/4;
 +
 +
      woffset = src_width/8 - SquareSize/2;
 +
 +
      for (h=0; h<SquareSize; h++) {
 +
          for (w=0; w<SquareSize; w++) {
 +
            srcp[woffset + w] = 0x00FFFFFF;
 +
          }
 +
          srcp += src_pitch/4;
 +
      }
 +
    }
 +
*/
 +
    if (vi.IsYUY2()) {
 +
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch;
 +
 +
      woffset = src_width/8 - SquareSize/4;
 +
 +
      for (h=0; h<SquareSize; h++) {
 +
          for (w=0; w<SquareSize/2; w++) {
 +
            *((unsigned int *)srcp + woffset + w) = 0x80EB80EB;
 +
          }
 +
          srcp += src_pitch;
 +
      }
 +
    }
 +
    if (vi.IsPlanar() && vi.IsYUV()) {
 +
 +
      int planes[] = {PLANAR_Y, PLANAR_U, PLANAR_V};
 +
      int square_value[] = {235, 128, 128};
 +
      int p;
 +
      int width_sub, height_sub;
 +
 +
      for (p=0; p<3; p++) {
 +
          srcp = src->GetWritePtr(planes[p]);
 +
          src_pitch = src->GetPitch(planes[p]);
 +
          src_width = src->GetRowSize(planes[p]);
 +
          src_height = src->GetHeight(planes[p]);
 +
          width_sub = vi.GetPlaneWidthSubsampling(planes[p]);
 +
          height_sub = vi.GetPlaneHeightSubsampling(planes[p]);
 +
 +
          srcp = srcp + (src_height/2 - (SquareSize>>height_sub)/2) * src_pitch;
 +
 +
          woffset = src_width/2 - (SquareSize>>width_sub)/2;
 +
 +
          for (h=0; h<(SquareSize>>height_sub); h++) {
 +
            for (w=0; w<(SquareSize>>width_sub); w++) {
 +
                srcp[woffset + w] = square_value[p];
 +
            }
 +
            srcp += src_pitch;
 +
          }
 +
      }
 +
    }
 +
 +
    return src;
 +
}
 +
 +
AVSValue __cdecl Create_SimpleSample(AVSValue args, void* user_data, IScriptEnvironment* env) {
 +
    return new SimpleSample(args[0].AsClip(), 
 +
                            args[1].AsInt(100),
 +
                            env);
 +
}
 +
 +
Compile this file into a DLL named SimpleSample.dll. See [[Filter_SDK/Compiling_instructions|compiling instructions]]. Now create an Avisynth script which looks something like this:
 +
 +
LoadPlugin("d:\path\simplesample.dll")
 +
Colorbars().Trim(0,1)
 +
ConvertToYV12()
 +
# ConvertToYV411() # requires AviSynth 2.6
 +
SimpleSample(100)
 +
 +
[[Category:FilterSDK]]

Latest revision as of 21:34, 6 October 2014

There are three ways to make dual plugins. That is 2.6 plugins (compiled with plugin api v5) that also work with AviSynth 2.5. They are described here below.

Contents

[edit] The InvertNeg example

For InvertNeg it's straightforward to make it as a dual plugin, since the code uses the 2.5 feature set. When using the 2.5+ feature set it becomes more elaborate (and it might not always be possible). See Simplesample for such an example.

[edit] Brute force solution one

This solution doubles all the code. You need to rename avisynth.h (v3) to avisynth25.h and avisynth.h (v5) to avisynth26.h and add them both to your project. You also need to add the following two source files to your project: 

/* InvertNeg25.cpp */

#include <windows.h>
#include "avisynth25.h"

class InvertNeg25 : public GenericVideoFilter {
public:
   InvertNeg25(PClip _child, IScriptEnvironment* env);
   PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* env);
};

InvertNeg25::InvertNeg25(PClip _child, IScriptEnvironment* env) :
   GenericVideoFilter(_child) {
   if (!vi.IsPlanar() || !vi.IsYUV()) {
      env->ThrowError("InvertNeg: planar YUV data only!");
   }
}

PVideoFrame __stdcall InvertNeg25::GetFrame(int n, IScriptEnvironment* env) {

   PVideoFrame src = child->GetFrame(n, env);
   PVideoFrame dst = env->NewVideoFrame(vi);

   const unsigned char* srcp;
   unsigned char* dstp;
   int src_pitch, dst_pitch, row_size, height;
   int p, x, y;

   int planes[] = {PLANAR_Y, PLANAR_V, PLANAR_U};
	
   for (p=0; p<3; p++) {
      srcp = src->GetReadPtr(planes[p]);
      dstp = dst->GetWritePtr(planes[p]);

      src_pitch = src->GetPitch(planes[p]);
      dst_pitch = dst->GetPitch(planes[p]);
      row_size = dst->GetRowSize(planes[p]);
      height = dst->GetHeight(planes[p]);

      for (y = 0; y < height; y++) {
         for (x = 0; x < row_size; x++) {
            dstp[x] = srcp[x] ^ 255;
         }
         srcp += src_pitch;
         dstp += dst_pitch;
      }
   }
   return dst;
}

AVSValue __cdecl Create_InvertNeg25(AVSValue args, void* user_data, IScriptEnvironment* env) {
   return new InvertNeg25(args[0].AsClip(), env);
}

extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(IScriptEnvironment* env) {
   env->AddFunction("InvertNeg", "c", Create_InvertNeg25, 0);
   return "InvertNeg sample plugin";
}

/* InvertNeg26.cpp */

#include <windows.h>
#include "avisynth26.h"

class InvertNeg26 : public GenericVideoFilter {
public:
   InvertNeg26(PClip _child, IScriptEnvironment* env);
   PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* env);
};

InvertNeg26::InvertNeg26(PClip _child, IScriptEnvironment* env) :
   GenericVideoFilter(_child) {
   if (!vi.IsPlanar() || !vi.IsYUV()) {
      env->ThrowError("InvertNeg: planar YUV data only!");
   }
}

PVideoFrame __stdcall InvertNeg26::GetFrame(int n, IScriptEnvironment* env) {

   PVideoFrame src = child->GetFrame(n, env);
   PVideoFrame dst = env->NewVideoFrame(vi);

   const unsigned char* srcp;
   unsigned char* dstp;
   int src_pitch, dst_pitch, row_size, height;
   int p, x, y;

   int planes[] = {PLANAR_Y, PLANAR_V, PLANAR_U};
	
   for (p=0; p<3; p++) {
      srcp = src->GetReadPtr(planes[p]);
      dstp = dst->GetWritePtr(planes[p]);

      src_pitch = src->GetPitch(planes[p]);
      dst_pitch = dst->GetPitch(planes[p]);
      row_size = dst->GetRowSize(planes[p]);
      height = dst->GetHeight(planes[p]);

      for (y = 0; y < height; y++) {
         for (x = 0; x < row_size; x++) {
            dstp[x] = srcp[x] ^ 255;
         }
         srcp += src_pitch;
         dstp += dst_pitch;
      }
   }
   return dst;
}

AVSValue __cdecl Create_InvertNeg26(AVSValue args, void* user_data, IScriptEnvironment* env) {
   return new InvertNeg26(args[0].AsClip(), env);
}

const AVS_Linkage *AVS_linkage = 0;

extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit3(IScriptEnvironment* env, const AVS_Linkage* const vectors) {
   AVS_linkage = vectors;
   env->AddFunction("InvertNeg", "c", Create_InvertNeg26, 0);
   return "InvertNeg sample plugin";
}

Note that both functions Create_InvertNeg25 and Create_InvertNeg26 are added in the function table (by AddFunction) as InvertNeg. Which one is called by your script will be decided by the AvisynthPluginInit2 and AvisynthPluginInit3 entry points (and thus your AviSynth version).

Compile both files into a DLL named InvertNeg.dll. See compiling instructions. Now create an AviSynth script which looks something like this: 

LoadPlugin("d:\path\InvertNeg.dll")
clip = BlankClip().ConvertToYV12()
return clip.InvertNeg()

The script should work both for AviSynth 2.5 and 2.6.

[edit] Brute force solution two

To stop having to double your source code you could use the namespace trick the 2.0 import wrapper uses.

Place all the filter generic code into a separate file, "InvertNeg.hpp", and #include it twice. Technically you have two copies of everything binary, but only a single source code. Note: outside the namespace you uniquely access object names as avs25::name or avs26::name. 

/* InvertNeg.cpp */

#include <windows.h>

namespace avs25 {
   #include "avisynth25.h"
   #include "InvertNeg.hpp"
}
 
#undef __AVISYNTH_H__ // name must not be included twice in the inclusions

namespace avs26 {
   #include "avisynth26.h"
   const AVS_Linkage *AVS_linkage = 0;
   #include "InvertNeg.hpp"
}

extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(avs25::IScriptEnvironment* env) {
   env->AddFunction("InvertNeg", "c", avs25::Create_InvertNeg, 0);
   return "InvertNeg sample plugin";
}

extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit3(avs26::IScriptEnvironment* env, const avs26::AVS_Linkage* const vectors) {
   avs26::AVS_linkage = vectors;
   env->AddFunction("InvertNeg", "c", avs26::Create_InvertNeg, 0);
   return "InvertNeg sample plugin";
}

/* InvertNeg.hpp */

class InvertNeg : public GenericVideoFilter {
public:
   InvertNeg(PClip _child, IScriptEnvironment* env);
   PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* env);
};

InvertNeg::InvertNeg(PClip _child, IScriptEnvironment* env) :
   GenericVideoFilter(_child) {
   if (!vi.IsPlanar() || !vi.IsYUV()) {
      env->ThrowError("InvertNeg: planar YUV data only!");
   }
}

PVideoFrame __stdcall InvertNeg::GetFrame(int n, IScriptEnvironment* env) {

   PVideoFrame src = child->GetFrame(n, env);
   PVideoFrame dst = env->NewVideoFrame(vi);

   const unsigned char* srcp;
   unsigned char* dstp;
   int src_pitch, dst_pitch, row_size, height;
   int p, x, y;

   int planes[] = {PLANAR_Y, PLANAR_V, PLANAR_U};
	
   for (p=0; p<3; p++) {
      srcp = src->GetReadPtr(planes[p]);
      dstp = dst->GetWritePtr(planes[p]);

      src_pitch = src->GetPitch(planes[p]);
      dst_pitch = dst->GetPitch(planes[p]);
      row_size = dst->GetRowSize(planes[p]);
      height = dst->GetHeight(planes[p]);

      for (y = 0; y < height; y++) {
         for (x = 0; x < row_size; x++) {
            dstp[x] = srcp[x] ^ 255;
         }
         srcp += src_pitch;
         dstp += dst_pitch;
      }
   }
   return dst;
}

AVSValue __cdecl Create_InvertNeg(AVSValue args, void* user_data, IScriptEnvironment* env) {
   return new InvertNeg(args[0].AsClip(), env);
}

Compile this file into a DLL named InvertNeg.dll. See compiling instructions. Now create an AviSynth script which looks something like this: 

LoadPlugin("d:\path\InvertNeg.dll")
clip = BlankClip().ConvertToYV12()
return clip.InvertNeg()

[edit] xxx

http://forum.doom9.org/showthread.php?p=1641346#post1641346 and subsequent posts ....

[edit] The SimpleSample example

The SimpleSample code uses the 2.5+ feature set, since it uses GetPlaneWidthSubsampling and GetPlaneHeightSubsampling. These are functions of VideoInfo. One way to get it to work is to add these functions in avisynth25.h in the VideoInfo structure. Note that in this case they are only used for YV12: 

/* avisynth25.h */

struct VideoInfo {
  ...
  // mimics 2.6 functionality for YV12
  int GetPlaneWidthSubsampling(int plane) const {
    switch(plane) {
    case PLANAR_Y:
      return 0;
    case PLANAR_U:
      return 1;
    case PLANAR_V:
      return 1;
    default:
      return 0;
    }
  }
  
  int GetPlaneHeightSubsampling(int plane) const {
    switch(plane) {
    case PLANAR_Y:
      return 0;
    case PLANAR_U:
      return 1;
    case PLANAR_V:
      return 1;
    default:
      return 0;
    }
  }
};

Now we can place all the filter generic code into a separate file, "simplesample.hpp", #include it twice, and access object names as avs25::name or avs26::name. 

/* simplesample.cpp */

/*
	SimpleSample plugin for Avisynth -- a simple sample

	Copyright (C) 2002-2013 Simon Walters, Wilbert Dijkhof, All Rights Reserved

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

	The author can be contacted at:
	wilbertdijkhof at yahoo.com

	v2.0 - AviSynth 2.6 api (based on v1.6 of Simon Walters)
	v2.1 - Dual plugin for 2.5 and 2.6
*/

#include <windows.h>

namespace avs25 {
  #include "avisynth25.h"
  #include "simplesample.hpp"
}
 
#undef __AVISYNTH_H__ // name must not be included twice in the inclusions

namespace avs26 {
  #include "avisynth26.h"
  const AVS_Linkage *AVS_linkage = 0;
  #include "simplesample.hpp"
}

extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(avs25::IScriptEnvironment* env) {
  env->AddFunction("SimpleSample", "c[size]i", avs25::Create_SimpleSample, 0);
  return "SimpleSample plugin";
}

extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit3(avs26::IScriptEnvironment* env, const avs26::AVS_Linkage* const vectors) {
  avs26::AVS_linkage = vectors;
  env->AddFunction("SimpleSample", "c[size]i", avs26::Create_SimpleSample, 0);
  return "SimpleSample plugin";
}



/* simplesample.hpp */

class SimpleSample : public GenericVideoFilter {
   int SquareSize;
public:
   SimpleSample(PClip _child, int _SquareSize, IScriptEnvironment* env);
   ~SimpleSample();
   PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* env);
};

SimpleSample::SimpleSample(PClip _child, int _SquareSize, IScriptEnvironment* env) :
   GenericVideoFilter(_child), SquareSize(_SquareSize) {
   if (vi.width<SquareSize || vi.height<SquareSize) {
      env->ThrowError("SimpleSample: square doesn't fit into the clip!");
   }
}

SimpleSample::~SimpleSample() {}

PVideoFrame __stdcall SimpleSample::GetFrame(int n, IScriptEnvironment* env) {

   PVideoFrame src = child->GetFrame(n, env);
   env->MakeWritable(&src);

   unsigned char* srcp = src->GetWritePtr();
   int src_pitch = src->GetPitch();
   int src_width = src->GetRowSize();
   int src_height = src->GetHeight();

   int w, h, woffset;

   if (vi.IsRGB24()) {
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch;

      woffset = src_width/2 - 3*SquareSize/2;

      for (h=0; h<SquareSize; h++) {
         for (w=0; w<3*SquareSize; w+=3) {
            *(srcp + woffset + w) = 255;
            *(srcp + woffset + w + 1) = 255;
            *(srcp + woffset + w + 2) = 255;
         }															
         srcp += src_pitch;
      }
   }
   if (vi.IsRGB32()) {
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch;

      woffset = src_width/2 - 4*SquareSize/2;

      for (h=0; h<SquareSize; h++) {
         for (w=0; w<4*SquareSize; w+=4) {
            *(srcp + woffset + w) = 255;
            *(srcp + woffset + w + 1) = 255;
            *(srcp + woffset + w + 2) = 255;
         }
         srcp += src_pitch;
      }
   }
/*
   if (vi.IsRGB32()) { // variant 1 - processing a pixel at once
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch;

      woffset = src_width/8 - SquareSize/2;

      for (h=0; h<SquareSize; h++) {
         for (w=0; w<SquareSize; w++) {
            *((unsigned int *)srcp + woffset + w) = 0x00FFFFFF;
         }	
         srcp += src_pitch;
      }
   }
*/
/*
   if (vi.IsRGB32()) { // variant 2 - processing a pixel at once
      unsigned int* srcp = (unsigned int*)src->GetWritePtr();
	
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch/4;

      woffset = src_width/8 - SquareSize/2;

      for (h=0; h<SquareSize; h++) {
         for (w=0; w<SquareSize; w++) {
            srcp[woffset + w] = 0x00FFFFFF;
         }	
         srcp += src_pitch/4;
      }
   }
*/
   if (vi.IsYUY2()) {
      srcp = srcp + (src_height/2 - SquareSize/2) * src_pitch;

      woffset = src_width/8 - SquareSize/4;

      for (h=0; h<SquareSize; h++) {
         for (w=0; w<SquareSize/2; w++) {
            *((unsigned int *)srcp + woffset + w) = 0x80EB80EB;
         }
         srcp += src_pitch; 
      }
   }
   if (vi.IsPlanar() && vi.IsYUV()) {

      int planes[] = {PLANAR_Y, PLANAR_U, PLANAR_V};
      int square_value[] = {235, 128, 128};
      int p;
      int width_sub, height_sub;

      for (p=0; p<3; p++) {
         srcp = src->GetWritePtr(planes[p]);		
         src_pitch = src->GetPitch(planes[p]);
         src_width = src->GetRowSize(planes[p]);
         src_height = src->GetHeight(planes[p]);
         width_sub = vi.GetPlaneWidthSubsampling(planes[p]);
         height_sub = vi.GetPlaneHeightSubsampling(planes[p]);

         srcp = srcp + (src_height/2 - (SquareSize>>height_sub)/2) * src_pitch;

         woffset = src_width/2 - (SquareSize>>width_sub)/2;

         for (h=0; h<(SquareSize>>height_sub); h++) {
            for (w=0; w<(SquareSize>>width_sub); w++) {
               srcp[woffset + w] = square_value[p];
            }
            srcp += src_pitch;
         }
      }
   }

   return src;
}

AVSValue __cdecl Create_SimpleSample(AVSValue args, void* user_data, IScriptEnvironment* env) {
   return new SimpleSample(args[0].AsClip(),   
                           args[1].AsInt(100),
                           env); 
}

Compile this file into a DLL named SimpleSample.dll. See compiling instructions. Now create an Avisynth script which looks something like this: 

LoadPlugin("d:\path\simplesample.dll")
Colorbars().Trim(0,1)
ConvertToYV12()
# ConvertToYV411() # requires AviSynth 2.6
SimpleSample(100)
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