// Avisynth v2.5.  Copyright 2002 Ben Rudiak-Gould et al.
// Avisynth v2.6.  Copyright 2006 Klaus Post.
// Avisynth v2.6.  Copyright 2009 Ian Brabham.
// http://www.avisynth.org

// 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; either version 2 of the License, or
// (at your option) any later version.
//
// 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, or visit
// http://www.gnu.org/copyleft/gpl.html .
//
// Linking Avisynth statically or dynamically with other modules is making
// a combined work based on Avisynth.  Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of Avisynth give you
// permission to link Avisynth with independent modules that communicate
// with Avisynth solely through the interfaces defined in avisynth.h,
// regardless of the license terms of these independent modules, and to
// copy and distribute the resulting combined work under terms of your
// choice, provided that every copy of the combined work is accompanied
// by a complete copy of the source code of Avisynth (the version of
// Avisynth used to produce the combined work), being distributed under
// the terms of the GNU General Public License plus this exception.  An
// independent module is a module which is not derived from or based on
// Avisynth, such as 3rd-party filters, import and export plugins, or
// graphical user interfaces.




#ifndef __AVISYNTH_6_H__
#define __AVISYNTH_6_H__

#include "config.h"
#include "capi.h"
#include "types.h"


enum { AVISYNTH_INTERFACE_VERSION = 6 };


/* Compiler-specific crap */

// Tell MSVC to stop precompiling here
#ifdef _MSC_VER
  #pragma hdrstop
#endif

// Set up debugging macros for MS compilers; for others, step down to the
// standard <assert.h> interface
#ifdef _MSC_VER
  #include <crtdbg.h>
#else
  #define _RPT0(a,b) ((void)0)
  #define _RPT1(a,b,c) ((void)0)
  #define _RPT2(a,b,c,d) ((void)0)
  #define _RPT3(a,b,c,d,e) ((void)0)
  #define _RPT4(a,b,c,d,e,f) ((void)0)

  #define _ASSERTE(x) assert(x)
  #include <assert.h>
#endif



// I had problems with Premiere wanting 1-byte alignment for its structures,
// so I now set the Avisynth struct alignment explicitly here.
#pragma pack(push,8)

// The VideoInfo struct holds global information about a clip (i.e.
// information that does not depend on the frame number).  The GetVideoInfo
// method in IClip returns this struct.

enum {SAMPLE_INT8  = 1<<0,
      SAMPLE_INT16 = 1<<1,
      SAMPLE_INT24 = 1<<2,    // Int24 is a very stupid thing to code, but it's supported by some hardware.
      SAMPLE_INT32 = 1<<3,
      SAMPLE_FLOAT = 1<<4};

enum {
   PLANAR_Y=1<<0,
   PLANAR_U=1<<1,
   PLANAR_V=1<<2,
   PLANAR_ALIGNED=1<<3,
   PLANAR_Y_ALIGNED=PLANAR_Y|PLANAR_ALIGNED,
   PLANAR_U_ALIGNED=PLANAR_U|PLANAR_ALIGNED,
   PLANAR_V_ALIGNED=PLANAR_V|PLANAR_ALIGNED,
   PLANAR_A=1<<4,
   PLANAR_R=1<<5,
   PLANAR_G=1<<6,
   PLANAR_B=1<<7,
   PLANAR_A_ALIGNED=PLANAR_A|PLANAR_ALIGNED,
   PLANAR_R_ALIGNED=PLANAR_R|PLANAR_ALIGNED,
   PLANAR_G_ALIGNED=PLANAR_G|PLANAR_ALIGNED,
   PLANAR_B_ALIGNED=PLANAR_B|PLANAR_ALIGNED,
  };

class AvisynthError /* exception */ {
public:
  const char* const msg;
  AvisynthError(const char* _msg) : msg(_msg) {}

// Ensure AvisynthError cannot be publicly assigned!
private:
  AvisynthError& operator=(const AvisynthError&);
}; // end class AvisynthError


/* Forward references */
struct __single_inheritance VideoInfo;
class __single_inheritance VideoFrameBuffer;
class __single_inheritance VideoFrame;
class IClip;
class __single_inheritance PClip;
class __single_inheritance PVideoFrame;
class IScriptEnvironment;
class __single_inheritance AVSValue;


/*
 * Avisynth C++ plugin API code function pointers.
 *
 * In order to maintain binary compatibility with
 * future version do not change the order of the
 * existing function pointers. It will be baked
 * into all existing plugins.
 *
 * Add new function pointers to the end of the
 * structure. The linkage macros generate some
 * protection code to ensure newer plugin do not
 * call non-existing functions in an older host.
 */

struct AVS_Linkage {

  int Size;

/**********************************************************************/

// struct VideoInfo
  bool    (VideoInfo::*HasVideo)() const;
  bool    (VideoInfo::*HasAudio)() const;
  bool    (VideoInfo::*IsRGB)() const;
  bool    (VideoInfo::*IsRGB24)() const;
  bool    (VideoInfo::*IsRGB32)() const;
  bool    (VideoInfo::*IsYUV)() const;
  bool    (VideoInfo::*IsYUY2)() const;
  bool    (VideoInfo::*IsYV24)() const;
  bool    (VideoInfo::*IsYV16)() const;
  bool    (VideoInfo::*IsYV12)() const;
  bool    (VideoInfo::*IsYV411)() const;
  bool    (VideoInfo::*IsY8)() const;
  bool    (VideoInfo::*IsColorSpace)(int c_space) const;
  bool    (VideoInfo::*Is)(int property) const;
  bool    (VideoInfo::*IsPlanar)() const;
  bool    (VideoInfo::*IsFieldBased)() const;
  bool    (VideoInfo::*IsParityKnown)() const;
  bool    (VideoInfo::*IsBFF)() const;
  bool    (VideoInfo::*IsTFF)() const;
  bool    (VideoInfo::*IsVPlaneFirst)() const;
  int     (VideoInfo::*BytesFromPixels)(int pixels) const;
  int     (VideoInfo::*RowSize)(int plane) const;
  int     (VideoInfo::*BMPSize)() const;
  __int64 (VideoInfo::*AudioSamplesFromFrames)(int frames) const;
  int     (VideoInfo::*FramesFromAudioSamples)(__int64 samples) const;
  __int64 (VideoInfo::*AudioSamplesFromBytes)(__int64 bytes) const;
  __int64 (VideoInfo::*BytesFromAudioSamples)(__int64 samples) const;
  int     (VideoInfo::*AudioChannels)() const;
  int     (VideoInfo::*SampleType)() const;
  bool    (VideoInfo::*IsSampleType)(int testtype) const;
  int     (VideoInfo::*SamplesPerSecond)() const;
  int     (VideoInfo::*BytesPerAudioSample)() const;
  void    (VideoInfo::*SetFieldBased)(bool isfieldbased);
  void    (VideoInfo::*Set)(int property);
  void    (VideoInfo::*Clear)(int property);
  int     (VideoInfo::*GetPlaneWidthSubsampling)(int plane) const;
  int     (VideoInfo::*GetPlaneHeightSubsampling)(int plane) const;
  int     (VideoInfo::*BitsPerPixel)() const;
  int     (VideoInfo::*BytesPerChannelSample)() const;
  void    (VideoInfo::*SetFPS)(unsigned numerator, unsigned denominator);
  void    (VideoInfo::*MulDivFPS)(unsigned multiplier, unsigned divisor);
  bool    (VideoInfo::*IsSameColorspace)(const VideoInfo& vi) const;
// end struct VideoInfo

/**********************************************************************/

// class VideoFrameBuffer
  const BYTE* (VideoFrameBuffer::*VFBGetReadPtr)() const;
  BYTE*       (VideoFrameBuffer::*VFBGetWritePtr)();
  int         (VideoFrameBuffer::*GetDataSize)() const;
  int         (VideoFrameBuffer::*GetSequenceNumber)() const;
  int         (VideoFrameBuffer::*GetRefcount)() const;
// end class VideoFrameBuffer

/**********************************************************************/

// class VideoFrame
  int               (VideoFrame::*GetPitch)(int plane) const;
  int               (VideoFrame::*GetRowSize)(int plane) const;
  int               (VideoFrame::*GetHeight)(int plane) const;
  VideoFrameBuffer* (VideoFrame::*GetFrameBuffer)() const;
  int               (VideoFrame::*GetOffset)(int plane) const;
  const BYTE*       (VideoFrame::*VFGetReadPtr)(int plane) const;
  bool              (VideoFrame::*IsWritable)() const;
  BYTE*             (VideoFrame::*VFGetWritePtr)(int plane) const;
  void              (VideoFrame::*VideoFrame_DESTRUCTOR)();
// end class VideoFrame

/**********************************************************************/

// class IClip
  /* nothing */
// end class IClip

/**********************************************************************/

// class PClip
  void (PClip::*PClip_CONSTRUCTOR0)();
  void (PClip::*PClip_CONSTRUCTOR1)(const PClip& x);
  void (PClip::*PClip_CONSTRUCTOR2)(IClip* x);
  void (PClip::*PClip_OPERATOR_ASSIGN0)(IClip* x);
  void (PClip::*PClip_OPERATOR_ASSIGN1)(const PClip& x);
  void (PClip::*PClip_DESTRUCTOR)();
// end class PClip

/**********************************************************************/

// class PVideoFrame
  void (PVideoFrame::*PVideoFrame_CONSTRUCTOR0)();
  void (PVideoFrame::*PVideoFrame_CONSTRUCTOR1)(const PVideoFrame& x);
  void (PVideoFrame::*PVideoFrame_CONSTRUCTOR2)(VideoFrame* x);
  void (PVideoFrame::*PVideoFrame_OPERATOR_ASSIGN0)(VideoFrame* x);
  void (PVideoFrame::*PVideoFrame_OPERATOR_ASSIGN1)(const PVideoFrame& x);
  void (PVideoFrame::*PVideoFrame_DESTRUCTOR)();
// end class PVideoFrame

/**********************************************************************/

// class AVSValue
  void            (AVSValue::*AVSValue_CONSTRUCTOR0)();
  void            (AVSValue::*AVSValue_CONSTRUCTOR1)(IClip* c);
  void            (AVSValue::*AVSValue_CONSTRUCTOR2)(const PClip& c);
  void            (AVSValue::*AVSValue_CONSTRUCTOR3)(bool b);
  void            (AVSValue::*AVSValue_CONSTRUCTOR4)(int i);
  void            (AVSValue::*AVSValue_CONSTRUCTOR5)(float f);
  void            (AVSValue::*AVSValue_CONSTRUCTOR6)(double f);
  void            (AVSValue::*AVSValue_CONSTRUCTOR7)(const char* s);
  void            (AVSValue::*AVSValue_CONSTRUCTOR8)(const AVSValue* a, int size);
  void            (AVSValue::*AVSValue_CONSTRUCTOR9)(const AVSValue& v);
  void            (AVSValue::*AVSValue_DESTRUCTOR)();
  AVSValue&       (AVSValue::*AVSValue_OPERATOR_ASSIGN)(const AVSValue& v);
  const AVSValue& (AVSValue::*AVSValue_OPERATOR_INDEX)(int index) const;
  bool            (AVSValue::*Defined)() const;
  bool            (AVSValue::*IsClip)() const;
  bool            (AVSValue::*IsBool)() const;
  bool            (AVSValue::*IsInt)() const;
  bool            (AVSValue::*IsFloat)() const;
  bool            (AVSValue::*IsString)() const;
  bool            (AVSValue::*IsArray)() const;
  PClip           (AVSValue::*AsClip)() const;
  bool            (AVSValue::*AsBool1)() const;
  int             (AVSValue::*AsInt1)() const;
  const char*     (AVSValue::*AsString1)() const;
  double          (AVSValue::*AsFloat1)() const;
  bool            (AVSValue::*AsBool2)(bool def) const;
  int             (AVSValue::*AsInt2)(int def) const;
  double          (AVSValue::*AsDblDef)(double def) const;
  double          (AVSValue::*AsFloat2)(float def) const;
  const char*     (AVSValue::*AsString2)(const char* def) const;
  int             (AVSValue::*ArraySize)() const;
// end class AVSValue

/**********************************************************************/
  // Reserve pointer space so that we can keep compatibility with Avs "classic" even if it adds functions on its own
  void    (VideoInfo::*reserved[32])();
/**********************************************************************/
  // AviSynth+ additions
  int     (VideoInfo::*NumComponents)() const;
  int     (VideoInfo::*ComponentSize)() const;
  /**********************************************************************/
};

#ifdef BUILDING_AVSCORE
/* Macro resolution for code inside Avisynth.dll */
# define AVS_BakedCode(arg) ;
# define AVS_LinkCall(arg)
# define AVS_LinkCallV(arg)

#else
/* Macro resolution for code inside user plugin */
# ifdef AVS_LINKAGE_DLLIMPORT
extern __declspec(dllimport) const AVS_Linkage* const AVS_linkage;
# else
extern const AVS_Linkage* AVS_linkage;
# endif

# ifndef offsetof
#  include <stddef.h>
# endif

# define AVS_BakedCode(arg) { arg ; }
# define AVS_LinkCall(arg)  !AVS_linkage || offsetof(AVS_Linkage, arg) >= AVS_linkage->Size ?     0 : (this->*(AVS_linkage->arg))
# define AVS_LinkCallV(arg) !AVS_linkage || offsetof(AVS_Linkage, arg) >= AVS_linkage->Size ? *this : (this->*(AVS_linkage->arg))

#endif

struct VideoInfo {
  int width, height;    // width=0 means no video
  unsigned fps_numerator, fps_denominator;
  int num_frames;
  // This is more extensible than previous versions. More properties can be added seeminglesly.

  // Colorspace properties.
/*
7<<0  Planar Width Subsampling bits
      Use (X+1) & 3 for GetPlaneWidthSubsampling
        000 => 1        YV12, YV16
        001 => 2        YV411, YUV9
        010 => reserved
        011 => 0        YV24
        1xx => reserved

1<<3  VPlaneFirst YV12, YV16, YV24, YV411, YUV9
1<<4  UPlaneFirst I420

7<<8  Planar Height Subsampling bits
      Use ((X>>8)+1) & 3 for GetPlaneHeightSubsampling
        000 => 1        YV12
        001 => 2        YUV9
        010 => reserved
        011 => 0        YV16, YV24, YV411
        1xx => reserved

7<<16 Sample resolution bits
        000 => 8
        001 => 16
        010 => 32
        011 => reserved
        1xx => reserved

Planar match mask  1111.0000.0000.0111.0000.0111.0000.0111
Planar signature   10xx.0000.0000.00xx.0000.00xx.00xx.00xx
Planar filter mask 1111.1111.1111.1111.1111.1111.1100.1111
*/
  enum {
    CS_BGR = 1<<28,
    CS_YUV = 1<<29,
    CS_INTERLEAVED = 1<<30,
    CS_PLANAR = 1<<31,

    CS_Shift_Sub_Width   =  0,
    CS_Shift_Sub_Height  =  8,
    CS_Shift_Sample_Bits = 16,

    CS_Sub_Width_Mask    = 7 << CS_Shift_Sub_Width,
    CS_Sub_Width_1       = 3 << CS_Shift_Sub_Width, // YV24
    CS_Sub_Width_2       = 0 << CS_Shift_Sub_Width, // YV12, I420, YV16
    CS_Sub_Width_4       = 1 << CS_Shift_Sub_Width, // YUV9, YV411

    CS_VPlaneFirst       = 1 << 3, // YV12, YV16, YV24, YV411, YUV9
    CS_UPlaneFirst       = 1 << 4, // I420

    CS_Sub_Height_Mask   = 7 << CS_Shift_Sub_Height,
    CS_Sub_Height_1      = 3 << CS_Shift_Sub_Height, // YV16, YV24, YV411
    CS_Sub_Height_2      = 0 << CS_Shift_Sub_Height, // YV12, I420
    CS_Sub_Height_4      = 1 << CS_Shift_Sub_Height, // YUV9

    CS_Sample_Bits_Mask  = 7 << CS_Shift_Sample_Bits,
    CS_Sample_Bits_8     = 0 << CS_Shift_Sample_Bits,
    CS_Sample_Bits_16    = 1 << CS_Shift_Sample_Bits,
    CS_Sample_Bits_32    = 2 << CS_Shift_Sample_Bits,

    CS_PLANAR_MASK       = CS_PLANAR | CS_INTERLEAVED | CS_YUV | CS_BGR | CS_Sample_Bits_Mask
                                                  | CS_Sub_Height_Mask | CS_Sub_Width_Mask,
    CS_PLANAR_FILTER     = ~( CS_VPlaneFirst | CS_UPlaneFirst ),

  // Specific colorformats
    CS_UNKNOWN = 0,
    CS_BGR24 = 1<<0 | CS_BGR | CS_INTERLEAVED,
    CS_BGR32 = 1<<1 | CS_BGR | CS_INTERLEAVED,
    CS_YUY2  = 1<<2 | CS_YUV | CS_INTERLEAVED,
//  CS_YV12  = 1<<3  Reserved
//  CS_I420  = 1<<4  Reserved
    CS_RAW32 = 1<<5 | CS_INTERLEAVED,

//  YV12 must be 0xA000008 2.5 Baked API will see all new planar as YV12
//  I420 must be 0xA000010

    CS_YV24  = CS_PLANAR | CS_YUV | CS_Sample_Bits_8 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_1,  // YVU 4:4:4 planar
    CS_YV16  = CS_PLANAR | CS_YUV | CS_Sample_Bits_8 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_2,  // YVU 4:2:2 planar
    CS_YV12  = CS_PLANAR | CS_YUV | CS_Sample_Bits_8 | CS_VPlaneFirst | CS_Sub_Height_2 | CS_Sub_Width_2,  // YVU 4:2:0 planar
    CS_I420  = CS_PLANAR | CS_YUV | CS_Sample_Bits_8 | CS_UPlaneFirst | CS_Sub_Height_2 | CS_Sub_Width_2,  // YUV 4:2:0 planar
    CS_IYUV  = CS_I420,
    CS_YUV9  = CS_PLANAR | CS_YUV | CS_Sample_Bits_8 | CS_VPlaneFirst | CS_Sub_Height_4 | CS_Sub_Width_4,  // YUV 4:1:0 planar
    CS_YV411 = CS_PLANAR | CS_YUV | CS_Sample_Bits_8 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_4,  // YUV 4:1:1 planar

    CS_Y8    = CS_PLANAR | CS_INTERLEAVED | CS_YUV | CS_Sample_Bits_8,                                     // Y   4:0:0 planar

    //-------------------------
    // AVS16: new planar constants go live! Experimental PF 160613 
    CS_YUV444P16 = CS_PLANAR | CS_YUV | CS_Sample_Bits_16 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_1, // YUV 4:4:4 16bit samples
    CS_YUV422P16 = CS_PLANAR | CS_YUV | CS_Sample_Bits_16 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_2, // YUV 4:2:2 16bit samples
    CS_YUV420P16 = CS_PLANAR | CS_YUV | CS_Sample_Bits_16 | CS_VPlaneFirst | CS_Sub_Height_2 | CS_Sub_Width_2, // YUV 4:2:0 16bit samples
    // no short naming style. CS_YV24->CS_YV48 = CS_YUV444P16 ok. but YV12->YV24? no-no.

    // grey 16
    CS_Y16 = CS_PLANAR | CS_INTERLEAVED | CS_YUV | CS_Sample_Bits_16,                                      // Y   4:0:0 16bit samples

    // 32 bit samples (float)
    CS_YUV444PS = CS_PLANAR | CS_YUV | CS_Sample_Bits_32 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_1, // YUV 4:4:4 32bit samples
    CS_YUV422PS = CS_PLANAR | CS_YUV | CS_Sample_Bits_32 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_2, // YUV 4:2:2 32bit samples
    CS_YUV420PS = CS_PLANAR | CS_YUV | CS_Sample_Bits_32 | CS_VPlaneFirst | CS_Sub_Height_2 | CS_Sub_Width_2, // YUV 4:2:0 32bit samples
    // CS_YV96  = CS_YUV444PS, 

    // grey 32
    CS_Y32 = CS_PLANAR | CS_INTERLEAVED | CS_YUV | CS_Sample_Bits_32,                                      // Y   4:0:0 32bit samples

    // todo: rgb

/*
    CS_YV48  = CS_PLANAR | CS_YUV | CS_Sample_Bits_16 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_1, // YUV 4:4:4 16bit samples

    CS_YV96  = CS_PLANAR | CS_YUV | CS_Sample_Bits_32 | CS_VPlaneFirst | CS_Sub_Height_1 | CS_Sub_Width_1, // YUV 4:4:4 32bit samples

    CS_PRGB  = CS_PLANAR | CS_RGB | CS_Sample_Bits_8,                                                      // Planar RGB
    CS_RGB48 = CS_PLANAR | CS_RGB | CS_Sample_Bits_16,                                                     // Planar RGB 16bit samples
    CS_RGB96 = CS_PLANAR | CS_RGB | CS_Sample_Bits_32,                                                     // Planar RGB 32bit samples
*/
  };

  int pixel_type;                // changed to int as of 2.5


  int audio_samples_per_second;   // 0 means no audio
  int sample_type;                // as of 2.5
  __int64 num_audio_samples;      // changed as of 2.5
  int nchannels;                  // as of 2.5

  // Imagetype properties

  int image_type;

  enum {
    IT_BFF = 1<<0,
    IT_TFF = 1<<1,
    IT_FIELDBASED = 1<<2
  };

  // Chroma placement bits 20 -> 23  ::FIXME:: Really want a Class to support this
  enum {
    CS_UNKNOWN_CHROMA_PLACEMENT = 0 << 20,
    CS_MPEG1_CHROMA_PLACEMENT   = 1 << 20,
    CS_MPEG2_CHROMA_PLACEMENT   = 2 << 20,
    CS_YUY2_CHROMA_PLACEMENT    = 3 << 20,
    CS_TOPLEFT_CHROMA_PLACEMENT = 4 << 20
  };

  // useful functions of the above
  bool HasVideo() const AVS_BakedCode( return AVS_LinkCall(HasVideo)() )
  bool HasAudio() const AVS_BakedCode( return AVS_LinkCall(HasAudio)() )
  bool IsRGB() const AVS_BakedCode( return AVS_LinkCall(IsRGB)() )
  bool IsRGB24() const AVS_BakedCode( return AVS_LinkCall(IsRGB24)() )
  bool IsRGB32() const AVS_BakedCode( return AVS_LinkCall(IsRGB32)() )
  bool IsYUV() const AVS_BakedCode( return AVS_LinkCall(IsYUV)() )
  bool IsYUY2() const AVS_BakedCode( return AVS_LinkCall(IsYUY2)() )

  bool IsYV24()  const AVS_BakedCode( return AVS_LinkCall(IsYV24)() )
  bool IsYV16()  const AVS_BakedCode( return AVS_LinkCall(IsYV16)() )
  bool IsYV12()  const AVS_BakedCode( return AVS_LinkCall(IsYV12)() )
  bool IsYV411() const AVS_BakedCode( return AVS_LinkCall(IsYV411)() )
//bool IsYUV9()  const;
  bool IsY8()    const AVS_BakedCode( return AVS_LinkCall(IsY8)() )

  bool IsColorSpace(int c_space) const AVS_BakedCode( return AVS_LinkCall(IsColorSpace)(c_space) )

  bool Is(int property) const AVS_BakedCode( return AVS_LinkCall(Is)(property) )
  bool IsPlanar() const AVS_BakedCode( return AVS_LinkCall(IsPlanar)() )
  bool IsFieldBased() const AVS_BakedCode( return AVS_LinkCall(IsFieldBased)() )
  bool IsParityKnown() const AVS_BakedCode( return AVS_LinkCall(IsParityKnown)() )
  bool IsBFF() const AVS_BakedCode( return AVS_LinkCall(IsBFF)() )
  bool IsTFF() const AVS_BakedCode( return AVS_LinkCall(IsTFF)() )

  bool IsVPlaneFirst() const AVS_BakedCode( return AVS_LinkCall(IsVPlaneFirst)() )  // Don't use this
  // Will not work on planar images, but will return only luma planes
  int BytesFromPixels(int pixels) const AVS_BakedCode( return AVS_LinkCall(BytesFromPixels)(pixels) )
  int RowSize(int plane=0) const AVS_BakedCode( return AVS_LinkCall(RowSize)(plane) )
  int BMPSize() const AVS_BakedCode( return AVS_LinkCall(BMPSize)() )

  __int64 AudioSamplesFromFrames(int frames) const AVS_BakedCode( return AVS_LinkCall(AudioSamplesFromFrames)(frames) )
  int FramesFromAudioSamples(__int64 samples) const AVS_BakedCode( return AVS_LinkCall(FramesFromAudioSamples)(samples) )
  __int64 AudioSamplesFromBytes(__int64 bytes) const AVS_BakedCode( return AVS_LinkCall(AudioSamplesFromBytes)(bytes) )
  __int64 BytesFromAudioSamples(__int64 samples) const AVS_BakedCode( return AVS_LinkCall(BytesFromAudioSamples)(samples) )
  int AudioChannels() const AVS_BakedCode( return AVS_LinkCall(AudioChannels)() )
  int SampleType() const AVS_BakedCode( return AVS_LinkCall(SampleType)() )
  bool IsSampleType(int testtype) const AVS_BakedCode( return AVS_LinkCall(IsSampleType)(testtype) )
  int SamplesPerSecond() const AVS_BakedCode( return AVS_LinkCall(SamplesPerSecond)() )
  int BytesPerAudioSample() const AVS_BakedCode( return AVS_LinkCall(BytesPerAudioSample)() )
  void SetFieldBased(bool isfieldbased) AVS_BakedCode( AVS_LinkCall(SetFieldBased)(isfieldbased) )
  void Set(int property) AVS_BakedCode( AVS_LinkCall(Set)(property) )
  void Clear(int property) AVS_BakedCode( AVS_LinkCall(Clear)(property) )
  // Subsampling in bitshifts!
  int GetPlaneWidthSubsampling(int plane) const AVS_BakedCode( return AVS_LinkCall(GetPlaneWidthSubsampling)(plane) )
  int GetPlaneHeightSubsampling(int plane) const AVS_BakedCode( return AVS_LinkCall(GetPlaneHeightSubsampling)(plane) )
  int BitsPerPixel() const AVS_BakedCode( return AVS_LinkCall(BitsPerPixel)() )

  int BytesPerChannelSample() const AVS_BakedCode( return AVS_LinkCall(BytesPerChannelSample)() )

  // useful mutator
  void SetFPS(unsigned numerator, unsigned denominator) AVS_BakedCode( AVS_LinkCall(SetFPS)(numerator, denominator) )

  // Range protected multiply-divide of FPS
  void MulDivFPS(unsigned multiplier, unsigned divisor) AVS_BakedCode( AVS_LinkCall(MulDivFPS)(multiplier, divisor) )

  // Test for same colorspace
  bool IsSameColorspace(const VideoInfo& vi) const AVS_BakedCode(return AVS_LinkCall(IsSameColorspace)(vi))

  // Returns the number of color channels or planes in a frame
  int NumComponents() const AVS_BakedCode(return AVS_LinkCall(NumComponents)())

  // Returns the size in bytes of a single component of a pixel
  int ComponentSize() const AVS_BakedCode(return AVS_LinkCall(ComponentSize)())

}; // end struct VideoInfo




// VideoFrameBuffer holds information about a memory block which is used
// for video data.  For efficiency, instances of this class are not deleted
// when the refcount reaches zero; instead they're stored in a linked list
// to be reused.  The instances are deleted when the corresponding AVS
// file is closed.

class VideoFrameBuffer {
  BYTE* const data;
  const int data_size;
  // sequence_number is incremented every time the buffer is changed, so
  // that stale views can tell they're no longer valid.
  volatile long sequence_number;

  friend class VideoFrame;
  friend class Cache;
  friend class ScriptEnvironment;
  volatile long refcount;

protected:
  VideoFrameBuffer(int size);
  VideoFrameBuffer();
  ~VideoFrameBuffer();

public:
  const BYTE* GetReadPtr() const AVS_BakedCode( return AVS_LinkCall(VFBGetReadPtr)() )
  BYTE* GetWritePtr() AVS_BakedCode( return AVS_LinkCall(VFBGetWritePtr)() )
  int GetDataSize() const AVS_BakedCode( return AVS_LinkCall(GetDataSize)() )
  int GetSequenceNumber() const AVS_BakedCode( return AVS_LinkCall(GetSequenceNumber)() )
  int GetRefcount() const AVS_BakedCode( return AVS_LinkCall(GetRefcount)() )

// Ensure VideoFrameBuffer cannot be publicly assigned
private:
    VideoFrameBuffer& operator=(const VideoFrameBuffer&);

}; // end class VideoFrameBuffer


// VideoFrame holds a "window" into a VideoFrameBuffer.  Operator new
// is overloaded to recycle class instances.

class VideoFrame {
  volatile long refcount;
  VideoFrameBuffer* vfb;

  // Due to technical reasons these members are not const, but should be treated as such.
  // That means do not modify them once the class has been constructed.
  int offset, pitch, row_size, height, offsetU, offsetV, pitchUV;  // U&V offsets are from top of picture.
  int row_sizeUV, heightUV;

  friend class PVideoFrame;
  void AddRef();
  void Release();

  friend class ScriptEnvironment;
  friend class Cache;

  VideoFrame(VideoFrameBuffer* _vfb, int _offset, int _pitch, int _row_size, int _height);
  VideoFrame(VideoFrameBuffer* _vfb, int _offset, int _pitch, int _row_size, int _height, int _offsetU, int _offsetV, int _pitchUV, int _row_sizeUV, int _heightUV);

  void* operator new(size_t size);
// TESTME: OFFSET U/V may be switched to what could be expected from AVI standard!
public:
  int GetPitch(int plane=0) const AVS_BakedCode( return AVS_LinkCall(GetPitch)(plane) )
  int GetRowSize(int plane=0) const AVS_BakedCode( return AVS_LinkCall(GetRowSize)(plane) )
  int GetHeight(int plane=0) const AVS_BakedCode( return AVS_LinkCall(GetHeight)(plane) )

  // generally you shouldn't use these three
  VideoFrameBuffer* GetFrameBuffer() const AVS_BakedCode( return AVS_LinkCall(GetFrameBuffer)() )
  int GetOffset(int plane=0) const AVS_BakedCode( return AVS_LinkCall(GetOffset)(plane) )

  // in plugins use env->SubFrame() -- because implementation code is only available inside avisynth.dll. Doh!
  VideoFrame* Subframe(int rel_offset, int new_pitch, int new_row_size, int new_height) const;
  VideoFrame* Subframe(int rel_offset, int new_pitch, int new_row_size, int new_height, int rel_offsetU, int rel_offsetV, int pitchUV) const;

  const BYTE* GetReadPtr(int plane=0) const AVS_BakedCode( return AVS_LinkCall(VFGetReadPtr)(plane) )
  bool IsWritable() const AVS_BakedCode( return AVS_LinkCall(IsWritable)() )
  BYTE* GetWritePtr(int plane=0) const AVS_BakedCode( return AVS_LinkCall(VFGetWritePtr)(plane) )

  ~VideoFrame() AVS_BakedCode( AVS_LinkCall(VideoFrame_DESTRUCTOR)() )
#ifdef BUILDING_AVSCORE
public:
  void DESTRUCTOR();  /* Damn compiler won't allow taking the address of reserved constructs, make a dummy interlude */
#endif

// Ensure VideoFrame cannot be publicly assigned
private:
    VideoFrame& operator=(const VideoFrame&);

}; // end class VideoFrame

enum CachePolicyHint {
  // Values 0 to 5 are reserved for old 2.5 plugins
  // do not use them in new plugins

  // New 2.6 explicitly defined cache hints.
  CACHE_NOTHING=10, // Do not cache video.
  CACHE_WINDOW=11, // Hard protect upto X frames within a range of X from the current frame N.
  CACHE_GENERIC=12, // LRU cache upto X frames.
  CACHE_FORCE_GENERIC=13, // LRU cache upto X frames, override any previous CACHE_WINDOW.

  CACHE_GET_POLICY=30, // Get the current policy.
  CACHE_GET_WINDOW=31, // Get the current window h_span.
  CACHE_GET_RANGE=32, // Get the current generic frame range.

  CACHE_AUDIO=50, // Explicitly cache audio, X byte cache.
  CACHE_AUDIO_NOTHING=51, // Explicitly do not cache audio.
  CACHE_AUDIO_NONE=52, // Audio cache off (auto mode), X byte intial cache.
  CACHE_AUDIO_AUTO=53, // Audio cache on (auto mode), X byte intial cache.

  CACHE_GET_AUDIO_POLICY=70, // Get the current audio policy.
  CACHE_GET_AUDIO_SIZE=71, // Get the current audio cache size.

  CACHE_PREFETCH_FRAME=100, // Queue request to prefetch frame N.
  CACHE_PREFETCH_GO=101, // Action video prefetches.

  CACHE_PREFETCH_AUDIO_BEGIN=120, // Begin queue request transaction to prefetch audio (take critical section).
  CACHE_PREFETCH_AUDIO_STARTLO=121, // Set low 32 bits of start.
  CACHE_PREFETCH_AUDIO_STARTHI=122, // Set high 32 bits of start.
  CACHE_PREFETCH_AUDIO_COUNT=123, // Set low 32 bits of length.
  CACHE_PREFETCH_AUDIO_COMMIT=124, // Enqueue request transaction to prefetch audio (release critical section).
  CACHE_PREFETCH_AUDIO_GO=125, // Action audio prefetches.

  CACHE_GETCHILD_CACHE_MODE=200, // Cache ask Child for desired video cache mode.
  CACHE_GETCHILD_CACHE_SIZE=201, // Cache ask Child for desired video cache size.
  CACHE_GETCHILD_AUDIO_MODE=202, // Cache ask Child for desired audio cache mode.
  CACHE_GETCHILD_AUDIO_SIZE=203, // Cache ask Child for desired audio cache size.

  CACHE_GETCHILD_COST=220, // Cache ask Child for estimated processing cost.
    CACHE_COST_ZERO=221, // Child response of zero cost (ptr arithmetic only).
    CACHE_COST_UNIT=222, // Child response of unit cost (less than or equal 1 full frame blit).
    CACHE_COST_LOW=223, // Child response of light cost. (Fast)
    CACHE_COST_MED=224, // Child response of medium cost. (Real time)
    CACHE_COST_HI=225, // Child response of heavy cost. (Slow)

  CACHE_GETCHILD_THREAD_MODE=240, // Cache ask Child for thread safetyness.
    CACHE_THREAD_UNSAFE=241, // Only 1 thread allowed for all instances. 2.5 filters default!
    CACHE_THREAD_CLASS=242, // Only 1 thread allowed for each instance. 2.6 filters default!
    CACHE_THREAD_SAFE=243, //  Allow all threads in any instance.
    CACHE_THREAD_OWN=244, // Safe but limit to 1 thread, internally threaded.

  CACHE_GETCHILD_ACCESS_COST=260, // Cache ask Child for preferred access pattern.
    CACHE_ACCESS_RAND=261, // Filter is access order agnostic.
    CACHE_ACCESS_SEQ0=262, // Filter prefers sequential access (low cost)
    CACHE_ACCESS_SEQ1=263, // Filter needs sequential access (high cost)

  CACHE_AVSPLUS_CONSTANTS = 500,    // Smaller values are reserved for classic Avisynth

  CACHE_DONT_CACHE_ME,              // Filters that don't need caching (eg. trim, cache etc.) should return 1 to this request
  CACHE_SET_MIN_CAPACITY,
  CACHE_SET_MAX_CAPACITY,
  CACHE_GET_MIN_CAPACITY,
  CACHE_GET_MAX_CAPACITY,
  CACHE_GET_SIZE,
  CACHE_GET_REQUESTED_CAP,
  CACHE_GET_CAPACITY,
  CACHE_GET_MTMODE,

  CACHE_IS_CACHE_REQ,
  CACHE_IS_CACHE_ANS,
  CACHE_IS_MTGUARD_REQ,
  CACHE_IS_MTGUARD_ANS,

  CACHE_USER_CONSTANTS = 1000       // Smaller values are reserved for the core

};

// Base class for all filters.
class IClip {
  friend class PClip;
  friend class AVSValue;
  volatile long refcnt;
  void AddRef();
  void Release();
public:
  IClip() : refcnt(0) {}
  virtual int __stdcall GetVersion() { return AVISYNTH_INTERFACE_VERSION; }
  virtual PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* env) = 0;
  virtual bool __stdcall GetParity(int n) = 0;  // return field parity if field_based, else parity of first field in frame
  virtual void __stdcall GetAudio(void* buf, __int64 start, __int64 count, IScriptEnvironment* env) = 0;  // start and count are in samples
  /* Need to check GetVersion first, pre v5 will return random crap from EAX reg. */
  virtual int __stdcall SetCacheHints(int cachehints,int frame_range) = 0 ;  // We do not pass cache requests upwards, only to the next filter.
  virtual const VideoInfo& __stdcall GetVideoInfo() = 0;
  virtual __stdcall ~IClip() {}
}; // end class IClip


// smart pointer to IClip
class PClip {

  IClip* p;

  IClip* GetPointerWithAddRef() const;
  friend class AVSValue;
  friend class VideoFrame;

  void Init(IClip* x);
  void Set(IClip* x);

public:
  PClip() AVS_BakedCode( AVS_LinkCall(PClip_CONSTRUCTOR0)() )
  PClip(const PClip& x) AVS_BakedCode( AVS_LinkCall(PClip_CONSTRUCTOR1)(x) )
  PClip(IClip* x) AVS_BakedCode( AVS_LinkCall(PClip_CONSTRUCTOR2)(x) )
  void operator=(IClip* x) AVS_BakedCode( AVS_LinkCall(PClip_OPERATOR_ASSIGN0)(x) )
  void operator=(const PClip& x) AVS_BakedCode( AVS_LinkCall(PClip_OPERATOR_ASSIGN1)(x) )

  IClip* operator->() const { return p; }

  // useful in conditional expressions
  operator void*() const { return p; }
  bool operator!() const { return !p; }

  ~PClip() AVS_BakedCode( AVS_LinkCall(PClip_DESTRUCTOR)() )
#ifdef BUILDING_AVSCORE
public:
  void CONSTRUCTOR0();  /* Damn compiler won't allow taking the address of reserved constructs, make a dummy interlude */
  void CONSTRUCTOR1(const PClip& x);
  void CONSTRUCTOR2(IClip* x);
  void OPERATOR_ASSIGN0(IClip* x);
  void OPERATOR_ASSIGN1(const PClip& x);
  void DESTRUCTOR();
#endif
}; // end class PClip


// smart pointer to VideoFrame
class PVideoFrame {

  VideoFrame* p;

  void Init(VideoFrame* x);
  void Set(VideoFrame* x);

public:
  PVideoFrame() AVS_BakedCode( AVS_LinkCall(PVideoFrame_CONSTRUCTOR0)() )
  PVideoFrame(const PVideoFrame& x) AVS_BakedCode( AVS_LinkCall(PVideoFrame_CONSTRUCTOR1)(x) )
  PVideoFrame(VideoFrame* x) AVS_BakedCode( AVS_LinkCall(PVideoFrame_CONSTRUCTOR2)(x) )
  void operator=(VideoFrame* x) AVS_BakedCode( AVS_LinkCall(PVideoFrame_OPERATOR_ASSIGN0)(x) )
  void operator=(const PVideoFrame& x) AVS_BakedCode( AVS_LinkCall(PVideoFrame_OPERATOR_ASSIGN1)(x) )

  VideoFrame* operator->() const { return p; }

  // for conditional expressions
  operator void*() const { return p; }
  bool operator!() const { return !p; }

  ~PVideoFrame() AVS_BakedCode( AVS_LinkCall(PVideoFrame_DESTRUCTOR)() )
#ifdef BUILDING_AVSCORE
public:
  void CONSTRUCTOR0();  /* Damn compiler won't allow taking the address of reserved constructs, make a dummy interlude */
  void CONSTRUCTOR1(const PVideoFrame& x);
  void CONSTRUCTOR2(VideoFrame* x);
  void OPERATOR_ASSIGN0(VideoFrame* x);
  void OPERATOR_ASSIGN1(const PVideoFrame& x);
  void DESTRUCTOR();
#endif
}; // end class PVideoFrame


class AVSValue {
public:

  AVSValue() AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR0)() )
  AVSValue(IClip* c) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR1)(c) )
  AVSValue(const PClip& c) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR2)(c) )
  AVSValue(bool b) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR3)(b) )
  AVSValue(int i) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR4)(i) )
//  AVSValue(__int64 l);
  AVSValue(float f) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR5)(f) )
  AVSValue(double f) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR6)(f) )
  AVSValue(const char* s) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR7)(s) )
  AVSValue(const AVSValue* a, int size) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR8)(a, size) )
  AVSValue(const AVSValue& a, int size) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR8)(&a, size) )
  AVSValue(const AVSValue& v) AVS_BakedCode( AVS_LinkCall(AVSValue_CONSTRUCTOR9)(v) )

  ~AVSValue() AVS_BakedCode( AVS_LinkCall(AVSValue_DESTRUCTOR)() )
  AVSValue& operator=(const AVSValue& v) AVS_BakedCode( return AVS_LinkCallV(AVSValue_OPERATOR_ASSIGN)(v) )

  // Note that we transparently allow 'int' to be treated as 'float'.
  // There are no int<->bool conversions, though.

  bool Defined() const AVS_BakedCode( return AVS_LinkCall(Defined)() )
  bool IsClip() const AVS_BakedCode( return AVS_LinkCall(IsClip)() )
  bool IsBool() const AVS_BakedCode( return AVS_LinkCall(IsBool)() )
  bool IsInt() const AVS_BakedCode( return AVS_LinkCall(IsInt)() )
//  bool IsLong() const;
  bool IsFloat() const AVS_BakedCode( return AVS_LinkCall(IsFloat)() )
  bool IsString() const AVS_BakedCode( return AVS_LinkCall(IsString)() )
  bool IsArray() const AVS_BakedCode( return AVS_LinkCall(IsArray)() )

  PClip AsClip() const AVS_BakedCode( return AVS_LinkCall(AsClip)() )
  bool AsBool() const AVS_BakedCode( return AVS_LinkCall(AsBool1)() )
  int AsInt() const AVS_BakedCode( return AVS_LinkCall(AsInt1)() )
//  int AsLong() const;
  const char* AsString() const AVS_BakedCode( return AVS_LinkCall(AsString1)() )
  double AsFloat() const AVS_BakedCode( return AVS_LinkCall(AsFloat1)() )
  float AsFloatf() const AVS_BakedCode( return float( AVS_LinkCall(AsFloat1)() ) )
  
  bool AsBool(bool def) const AVS_BakedCode( return AVS_LinkCall(AsBool2)(def) )
  int AsInt(int def) const AVS_BakedCode( return AVS_LinkCall(AsInt2)(def) )
  double AsDblDef(double def) const AVS_BakedCode( return AVS_LinkCall(AsDblDef)(def) ) // Value is still a float
  double AsFloat(float def) const AVS_BakedCode( return AVS_LinkCall(AsFloat2)(def) )
  float AsFloatf(float def) const AVS_BakedCode( return float( AVS_LinkCall(AsFloat2)(def) ) )
  const char* AsString(const char* def) const AVS_BakedCode( return AVS_LinkCall(AsString2)(def) )

  int ArraySize() const AVS_BakedCode( return AVS_LinkCall(ArraySize)() )

  const AVSValue& operator[](int index) const AVS_BakedCode( return AVS_LinkCallV(AVSValue_OPERATOR_INDEX)(index) )

private:

  short type;  // 'a'rray, 'c'lip, 'b'ool, 'i'nt, 'f'loat, 's'tring, 'v'oid, or 'l'ong
  short array_size;
  union {
    IClip* clip;
    bool boolean;
    int integer;
    float floating_pt;
    const char* string;
    const AVSValue* array;
//    __int64 longlong;
  };

  void Assign(const AVSValue* src, bool init);
#ifdef BUILDING_AVSCORE
public:
  void            CONSTRUCTOR0();  /* Damn compiler won't allow taking the address of reserved constructs, make a dummy interlude */
  void            CONSTRUCTOR1(IClip* c);
  void            CONSTRUCTOR2(const PClip& c);
  void            CONSTRUCTOR3(bool b);
  void            CONSTRUCTOR4(int i);
  void            CONSTRUCTOR5(float f);
  void            CONSTRUCTOR6(double f);
  void            CONSTRUCTOR7(const char* s);
  void            CONSTRUCTOR8(const AVSValue* a, int size);
  void            CONSTRUCTOR9(const AVSValue& v);
  void            DESTRUCTOR();
  AVSValue&       OPERATOR_ASSIGN(const AVSValue& v);
  const AVSValue& OPERATOR_INDEX(int index) const;

  bool            AsBool1() const;
  int             AsInt1() const;
  const char*     AsString1() const;
  double          AsFloat1() const;

  bool            AsBool2(bool def) const;
  int             AsInt2(int def) const;
  double          AsFloat2(float def) const;
  const char*     AsString2(const char* def) const;
#endif
}; // end class AVSValue

#undef AVS_LinkCallV
#undef AVS_LinkCall
#undef AVS_BakedCode

// instantiable null filter
class GenericVideoFilter : public IClip {
protected:
  PClip child;
  VideoInfo vi;
public:
  GenericVideoFilter(PClip _child) : child(_child) { vi = child->GetVideoInfo(); }
  PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* env) { return child->GetFrame(n, env); }
  void __stdcall GetAudio(void* buf, __int64 start, __int64 count, IScriptEnvironment* env) { child->GetAudio(buf, start, count, env); }
  const VideoInfo& __stdcall GetVideoInfo() { return vi; }
  bool __stdcall GetParity(int n) { return child->GetParity(n); }
  int __stdcall SetCacheHints(int cachehints,int frame_range) { return 0; } ;  // We do not pass cache requests upwards, only to the next filter.
};




#include "cpuid.h"



class IScriptEnvironment {
public:
  virtual __stdcall ~IScriptEnvironment() {}

  virtual /*static*/ int __stdcall GetCPUFlags() = 0;

  virtual char* __stdcall SaveString(const char* s, int length = -1) = 0;
  virtual char* __stdcall Sprintf(const char* fmt, ...) = 0;
  // note: val is really a va_list; I hope everyone typedefs va_list to a pointer
  virtual char* __stdcall VSprintf(const char* fmt, void* val) = 0;

  __declspec(noreturn) virtual void __stdcall ThrowError(const char* fmt, ...) = 0;

  class NotFound /*exception*/ {};  // thrown by Invoke and GetVar

  typedef AVSValue (__cdecl *ApplyFunc)(AVSValue args, void* user_data, IScriptEnvironment* env);

  virtual void __stdcall AddFunction(const char* name, const char* params, ApplyFunc apply, void* user_data) = 0;
  virtual bool __stdcall FunctionExists(const char* name) = 0;
  virtual AVSValue __stdcall Invoke(const char* name, const AVSValue args, const char* const* arg_names=0) = 0;

  virtual AVSValue __stdcall GetVar(const char* name) = 0;
  virtual bool __stdcall SetVar(const char* name, const AVSValue& val) = 0;
  virtual bool __stdcall SetGlobalVar(const char* name, const AVSValue& val) = 0;

  virtual void __stdcall PushContext(int level=0) = 0;
  virtual void __stdcall PopContext() = 0;

  // align should be 4 or 8
  virtual PVideoFrame __stdcall NewVideoFrame(const VideoInfo& vi, int align=FRAME_ALIGN) = 0;

  virtual bool __stdcall MakeWritable(PVideoFrame* pvf) = 0;

  virtual void __stdcall BitBlt(BYTE* dstp, int dst_pitch, const BYTE* srcp, int src_pitch, int row_size, int height) = 0;

  typedef void (__cdecl *ShutdownFunc)(void* user_data, IScriptEnvironment* env);
  virtual void __stdcall AtExit(ShutdownFunc function, void* user_data) = 0;

  virtual void __stdcall CheckVersion(int version = AVISYNTH_INTERFACE_VERSION) = 0;

  virtual PVideoFrame __stdcall Subframe(PVideoFrame src, int rel_offset, int new_pitch, int new_row_size, int new_height) = 0;

  virtual int __stdcall SetMemoryMax(int mem) = 0;

  virtual int __stdcall SetWorkingDir(const char * newdir) = 0;

  virtual void* __stdcall ManageCache(int key, void* data) = 0;

  enum PlanarChromaAlignmentMode {
            PlanarChromaAlignmentOff,
            PlanarChromaAlignmentOn,
            PlanarChromaAlignmentTest };

  virtual bool __stdcall PlanarChromaAlignment(PlanarChromaAlignmentMode key) = 0;

  virtual PVideoFrame __stdcall SubframePlanar(PVideoFrame src, int rel_offset, int new_pitch, int new_row_size,
                                               int new_height, int rel_offsetU, int rel_offsetV, int new_pitchUV) = 0;

  virtual void __stdcall DeleteScriptEnvironment() = 0;

  virtual void __stdcall ApplyMessage(PVideoFrame* frame, const VideoInfo& vi, const char* message, int size,
                                     int textcolor, int halocolor, int bgcolor) = 0;

  virtual const AVS_Linkage* const __stdcall GetAVSLinkage() = 0;

  // noThrow version of GetVar
  virtual AVSValue __stdcall GetVarDef(const char* name, const AVSValue& def = AVSValue()) = 0;

}; // end class IScriptEnvironment


enum MtMode
{
  MT_INVALID = 0,
  MT_NICE_FILTER = 1,
  MT_MULTI_INSTANCE = 2,
  MT_SERIALIZED = 3,
  MT_MODE_COUNT = 4
};

class IJobCompletion
{
public:

  virtual __stdcall ~IJobCompletion() {}
  virtual void __stdcall Wait() = 0;
  virtual AVSValue __stdcall Get(size_t i) = 0;
  virtual size_t __stdcall Size() const = 0;
  virtual size_t __stdcall Capacity() const = 0;
  virtual void __stdcall Reset() = 0;
  virtual void __stdcall Destroy() = 0;
};

class IScriptEnvironment2;
class Prefetcher;
typedef AVSValue (*ThreadWorkerFuncPtr)(IScriptEnvironment2* env, void* data);

enum AvsEnvProperty
{
  AEP_PHYSICAL_CPUS = 1,
  AEP_LOGICAL_CPUS = 2,
  AEP_THREADPOOL_THREADS = 3,
  AEP_FILTERCHAIN_THREADS = 4,
  AEP_THREAD_ID = 5,
  AEP_VERSION = 6
};

enum AvsAllocType
{
  AVS_NORMAL_ALLOC  = 1,
  AVS_POOLED_ALLOC  = 2
};

/* -----------------------------------------------------------------------------
   Note to plugin authors: The interface in IScriptEnvironment2 is 
      preliminary / under construction / only for testing / non-final etc.!
      As long as you see this note here, IScriptEnvironment2 might still change, 
      in which case your plugin WILL break. This also means that you are welcome
      to test it and give your feedback about any ideas, improvements, or issues
      you might have.
   ----------------------------------------------------------------------------- */
class AVSFunction;
class IScriptEnvironment2 : public IScriptEnvironment{
public:
  virtual __stdcall ~IScriptEnvironment2() {}

  // Generic system to ask for various properties
  virtual size_t  __stdcall GetProperty(AvsEnvProperty prop) = 0;

  // Returns TRUE and the requested variable. If the method fails, returns FALSE and does not touch 'val'.
  virtual bool  __stdcall GetVar(const char* name, AVSValue *val) const = 0;

  // Return the value of the requested variable.
  // If the variable was not found or had the wrong type,
  // return the supplied default value.
  virtual bool __stdcall GetVar(const char* name, bool def) const = 0;
  virtual int  __stdcall GetVar(const char* name, int def) const = 0;
  virtual double  __stdcall GetVar(const char* name, double def) const = 0;
  virtual const char*  __stdcall GetVar(const char* name, const char* def) const = 0;

  // Plugin functions
  virtual bool __stdcall LoadPlugin(const char* filePath, bool throwOnError, AVSValue *result) = 0;
  virtual void __stdcall AddAutoloadDir(const char* dirPath, bool toFront) = 0;
  virtual void __stdcall ClearAutoloadDirs() = 0;
  virtual void __stdcall AutoloadPlugins() = 0;
  virtual void __stdcall AddFunction(const char* name, const char* params, ApplyFunc apply, void* user_data, const char *exportVar) = 0;
  virtual bool __stdcall InternalFunctionExists(const char* name) = 0;

  // Threading
  virtual void __stdcall SetFilterMTMode(const char* filter, MtMode mode, bool force) = 0; // If filter is "DEFAULT_MT_MODE", sets the default MT mode
  virtual IJobCompletion* __stdcall NewCompletion(size_t capacity) = 0;
  virtual void __stdcall ParallelJob(ThreadWorkerFuncPtr jobFunc, void* jobData, IJobCompletion* completion) = 0;

  // This version of Invoke will return false instead of throwing NotFound().
  virtual bool __stdcall Invoke(AVSValue *result, const char* name, const AVSValue& args, const char* const* arg_names=0) = 0;

  // Support functions
  virtual void* __stdcall Allocate(size_t nBytes, size_t alignment, AvsAllocType type) = 0;
  virtual void __stdcall Free(void* ptr) = 0;

  // These lines are needed so that we can overload the older functions from IScriptEnvironment.
  using IScriptEnvironment::Invoke;
  using IScriptEnvironment::AddFunction;
  using IScriptEnvironment::GetVar;

}; // end class IScriptEnvironment2


// avisynth.dll exports this; it's a way to use it as a library, without
// writing an AVS script or without going through AVIFile.
IScriptEnvironment* __stdcall CreateScriptEnvironment(int version = AVISYNTH_INTERFACE_VERSION);


// These are some global variables you can set in your script to change AviSynth's behavior.
#define VARNAME_AllowFloatAudio   "OPT_AllowFloatAudio"   // Allow WAVE_FORMAT_IEEE_FLOAT audio output
#define VARNAME_VDubPlanarHack    "OPT_VDubPlanarHack"    // Hack YV16 and YV24 chroma plane order for old VDub's
#define VARNAME_AVIPadScanlines   "OPT_AVIPadScanlines"   // Have scanlines mod4 padded in all pixel formats
#define VARNAME_UseWaveExtensible "OPT_UseWaveExtensible" // Use WAVEFORMATEXTENSIBLE when describing audio to Windows
#define VARNAME_dwChannelMask     "OPT_dwChannelMask"     // Integer audio channel mask. See description of WAVEFORMATEXTENSIBLE for more info.


// C exports
#include "capi.h"
AVSC_API(IScriptEnvironment2*, CreateScriptEnvironment2)(int version = AVISYNTH_INTERFACE_VERSION);


#pragma pack(pop)

#endif //__AVISYNTH_6_H__
