VideoRecord

A video filter is passed a handle to a VideoRecord with almost every selector.

typedef struct {
  PrMemoryHandle          specsHandle;
  PPixHand                source;
  PPixHand                destination;
  csSDK_int32             part;
  csSDK_int32             total;
  char                    previewing;
  void*                   privateData;
  VFilterCallBackProcPtr  callBack;
  BottleRec*              bottleNecks;
  short                   version;
  short                   sizeFlags;
  csSDK_int32             flags;
  TDB_TimeRecord*         tdb;
  PrMemoryHandle          instanceData;
  piSuitesPtr             piSuites;
  PrTimelineID            timelineData;
  char                    altName[MAX_FXALIAS];
  PrPixelFormat           pixelFormatSupported;
  csSDK_int32             pixelFormatIndex;
  csSDK_uint32            instanceID;
  TDB_TimeRecord          tdbTimelineLocation;
  csSDK_int32             sessionPluginID;
} VideoRecord, **VideoHandle;

Member	Description
`specsHandle`	Instance settings, persistent across Premiere sessions.
	Create this handle during `fsInitSpec` or `fsSetup`.
	Populated by Premiere if the filter’s parameters can be manipulated in the Effect Controls Panel.
	Use Premiere’s memory allocation callbacks to allocate memory for the `specsHandle`.
`source`	`PPixHand` for the source video frame.
`destination`	`PPixHand` for the destination video frame, always the same size as source.
	Store the output frame here during `fsExecute`.
`part`	How far into the effect you are.
	`part` varies from 0 to total, inclusive.
`total`	Total length of the video filter.
	Divide part by total to calculate the percentage of the time-variant filter for a given `fsExecute`.
	This value doesn’t necessarily correspond to frames or fields.
`previewing`	Unsupported
`privateData`	Data private to Premiere.
	Pass to the frame-retrieval callback when requesting a frame.
`callBack`	Pointer to `VFilterCallbackProcPtr`, used for retrieving frames (or fields, for interlaced video) from source clips.
`bottleNecks`	Pointer to Premiere’s bottleRec functions.
`version`	Version of this structure (`kVideoFilterVersion`).
	- Premiere Pro CS5 = `VIDEO_FILTER_VERSION_11`
	- Premiere Pro CS3 = `VIDEO_FILTER_VERSION_10`
`sizeFlags`	Field-rendering information.
`flags`	If doing a lower-quality render, Premiere will pass in `kEffectFlags_DraftQuality` during `fsExecute`.
	The filter can then optionally render a faster, lower-quality image for previewing.
`tdb`	Pointer to a time database record describing the sequence timebase.
`instanceData`	Handle to private instance data that persists across invocations.
	Allocate the memory for this during `fsExecute` and deallocate during `fsDisposeData`.
	Do not use this field during fsSetup.
`piSuites`	Pointer to callback piSuites.
`timelineData`	Only available during `fsInitSpec` and `fsSetup`.
	This opaque handle to the timeline database is required by `timelineFuncs` callbacks available in piSuites.
	This handle is useful in order to have a preview in a modal setup dialog during `fsSetup`.
`altName`	Unused.
`pixelFormatSupported`	Only valid during `fsGetPixelFormatsSupported`.
	Return pixel type supported.
`pixelFormatIndex`	Only valid during `fsGetPixelFormatsSupported`.
	Index of fourCC of pixel type supported.
`instanceID`	The runtime instance ID uniquely identifies filters during a session.
	This is the same ID that is passed to players in `prtFilterRec`.
`tdbTimelineLocation`	A time database record describing the location of the filter in sequence.
	Only valid during `fsInitSpec` and `fsSetup`.
`sessionPluginID`	This ID should be used in the File Registration Suite for registering external files (such as textures, logos, etc) that are used by a plugin instance but do not appear as footage in the Project Panel.
	Registered files will be taken into account when trimming or copying a project using the Project Manager.

VFilterCallBackProcPtr

Pointer to a callback for retrieving frames (or fields, for interlaced video) from the source clip.

Do not expect real-time performance from this callback.

typedef short (CALLBACK *VFilterCallBackProcPtr)(
  csSDK_int32  frame;
  PPixHand     thePort;
  RECT*        theBox;
  Handle       privateData);

Member	Description
`frame`	Frame requested. The frame value passed in should be frame * samplesize.
	The callback will always return the current field (upper or lower) during field rendering.
`thePort`	`PPixHand` where Premiere will store the frame
`theBox`	Bounds of the frame you want Premiere to retrieve.
`privateData`	Handle provided by Premiere in `VideoRecord.privateData`

sizeFlags

For sizeFlags, the following bit flags are of interest:

Flag	Description
`gvFieldsEven`	The video filter should render upper-field dominance
`gvFieldsOdd`	The video filter should render lower-field dominance
`gvFieldsFirst`	The video filter is currently rendering the dominant field