# DualPlugins

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

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.

### 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()

### xxx

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 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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`$Date: 2014/10/27 22:04:54 $`