C++: VstIntPtr function dispatcher(AEffect* e, VstInt32 opcode, VstInt32 index, VstIntPtr value, void* ptr, float opt);
Delphi: function dispatcher(e: PAEffect; opcode, index: VstInt32; value: VstIntPtr; ptr: pointer; opt: Single): VstIntPtr; cdecl;
always returns 0, unless otherwise defined.
all string-pointers points to zero terminated strings.
e[ ]: = plugin receives as entry parameter
x[ ]: = plugin returns to host

dispatcher() function using opcode 38:
38. effOfflineNotify   >= VST2.0   (offline)   @see AudioEffectX::offlineNotify()
e[index]: start flag
e[value]: count
e[ptr]: pointer to VstAudioFile array
x[return]: 1 = successful

C++ method:

 bool AudioEffectX::offlineNotify(VstAudioFile* ptr, VstInt32 numAudioFiles, bool start)

Delphi method:

 function AudioEffectX.offlineNotify(ptr: PVstAudioFile; numAudioFiles: VstInt32; start: boolean): boolean;

VstAudioFile structure:

struct VstAudioFile
 {
  VstInt32 flags;                // see enum #VstAudioFileFlags
  void* hostOwned;               // any data private to Host
  void* plugOwned;               // any data private to plug-in
  char name[kVstMaxFileNameLen]; // file title
  VstInt32 uniqueId;             // uniquely identify a file during a session
  double sampleRate;             // file sample rate
  VstInt32 numChannels;          // number of channels (1 for mono, 2 for stereo...)
  double numFrames;              // number of frames in the audio file
  VstInt32 format;               // Reserved for future use
  double editCursorPosition;     // -1 if no such cursor
  double selectionStart;         // frame index of first selected frame, or -1
  double selectionSize;          // number of frames in selection, or 0
  VstInt32 selectedChannelsMask; // 1 bit per channel
  VstInt32 numMarkers;           // number of markers in the file
  VstInt32 timeRulerUnit;        // see doc for possible values
  double timeRulerOffset;        // offset in time ruler (positive or negative)
  double tempo;                  // as BPM (Beats Per Minute)
  VstInt32 timeSigNumerator;     // time signature numerator
  VstInt32 timeSigDenominator;   // time signature denominator
  VstInt32 ticksPerBlackNote;    // resolution
  VstInt32 smpteFrameRate;       // SMPTE rate (set as in #VstTimeInfo)
  char future[64];               // Reserved for future use
 };

VstAudioFileFlags constants:

enum VstAudioFileFlags
 {
  kVstOfflineReadOnly            = 1 << 0,   // set by Host (in call #offlineNotify)
  kVstOfflineNoRateConversion    = 1 << 1,   // set by Host (in call #offlineNotify)
  kVstOfflineNoChannelChange     = 1 << 2,   // set by Host (in call #offlineNotify)
  kVstOfflineCanProcessSelection = 1 << 10,  // set by plug-in (in call #offlineStart)
  kVstOfflineNoCrossfade         = 1 << 11,  // set by plug-in (in call #offlineStart)
  kVstOfflineWantRead            = 1 << 12,  // set by plug-in (in call #offlineStart)
  kVstOfflineWantWrite           = 1 << 13,  // set by plug-in (in call #offlineStart)
  kVstOfflineWantWriteMarker     = 1 << 14,  // set by plug-in (in call #offlineStart)
  kVstOfflineWantMoveCursor      = 1 << 15,  // set by plug-in (in call #offlineStart)
  kVstOfflineWantSelect          = 1 << 16   // set by plug-in (in call #offlineStart)
 };

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