ILMVResize Interface

This is the interface for the LEAD Video Resize filter.

Data types:

QUICKRESIZE:

typedef enum 
{ 
   RESIZE_1OVER8 = 0, 
   RESIZE_1OVER4 = 1, 
   RESIZE_1OVER2 = 2, 
   RESIZE_NORMAL = 3, 
   RESIZE_X2     = 4, 
   RESIZE_X4     = 5, 
   RESIZE_X8     = 6 
} QUICKRESIZE; 

Holds the predefined resizing constants.

Constant

Description

RESIZE_1OVER8

The output width and height are 1/8 of the source width and height.

RESIZE_1OVER4

The output width and height are 1/4 of the source width and height.

RESIZE_1OVER2

The output width and height are 1/2 of the source width and height.

RESIZE_NORMAL

The output width and height are same as the source width and height.

RESIZE_X2

The output width and height are 2X of the source width and height.

RESIZE_X4

The output width and height are 4X of the source width and height.

RESIZE_X8

The output width and height are 8X of the source width and height.

SIZETYPES:

typedef enum 
{ 
   RESIZE_NORMAL = 0x0000, 
   RESIZE_BRESENHAM = 0x0001, 
   RESIZE_RESAMPLE = 0x0002, 
   RESIZE_BICUBIC = 0x0004, 
} SIZETYPES; 

Holds the resizing algorithms constants.

Constant

Description

RESIZE_NORMAL

Use the normal resizing method.

RESIZE_BRESENHAM

Use Bresenham resizing.

RESIZE_RESAMPLE

Use resampling.

RESIZE_BICUBIC

Use bicubic resizing.

InputAspectRatioModeConstants:

typedef enum 
{ 
   INPUTASPECTRATIO_SQUAREPIXELS    = 0, 
   INPUTASPECTRATIO_USEINPUT        = 1, 
   INPUTASPECTRATIO_CUSTOM          = 2, 
   INPUTASPECTRATIO_4_3             = 10, 
   INPUTASPECTRATIO_16_9            = 11, 
} InputAspectRatioModeConstants; 

Constant

Description

INPUTASPECTRATIO_SQUAREPIXELS

Ignore the any input aspect ratio and consider the input to be square pixels.

INPUTASPECTRATIO_USEINPUT          

Use the input aspect ratio (if present). Otherwise, consider the input to be square pixels.

INPUTASPECTRATIO_CUSTOM 

Ignore any input aspect ratio and consider it to be given by the CustomInputAspectRatioWidth and CustomInputAspectRatioHeight properties.

INPUTASPECTRATIO_4_3

Ignore the input aspect ratio and consider it to be 4:3.

INPUTASPECTRATIO_16_9

Ignore the input aspect ratio and consider it to be 16:9.

OutputAspectRatioModeConstants:

typedef enum 
{ 
   OUTPUTASPECTRATIO_SQUAREPIXELS   = 0, 
   OUTPUTASPECTRATIO_USEINPUT       = 1, 
   OUTPUTASPECTRATIO_CUSTOM         = 2, 
   OUTPUTASPECTRATIO_4_3            = 10, 
   OUTPUTASPECTRATIO_16_9           = 11, 
} OutputAspectRatioModeConstants; 

Constant

Description

OUTPUTASPECTRATIO_SQUAREPIXELS

Make the output aspect ratio square pixels.

OUTPUTASPECTRATIO_USEINPUT          

Make the output aspect ratio be the same as the input aspect ratio.

OUTPUTASPECTRATIO_CUSTOM 

Use the output aspect ratio given by the CustomOutputAspectRatioWidth and CustomOutputAspectRatioHeight properties.

OUTPUTASPECTRATIO_4_3

Make the output have a 4:3 aspect ratio.

OUTPUTASPECTRATIO_16_9

Make the output have a 4:3 aspect ratio.

StretchModeConstants:

typedef enum 
{ 
   STRETCHMODE_STRETCH, 
   STRETCHMODE_FITWIDTH, 
   STRETCHMODE_FITHEIGHT, 
   STRETCHMODE_FIT, 
   STRETCHMODE_ENLARGEDFIT, 
} StretchModeConstants; 

Constant

Description

STRETCHMODE_STRETCH

Ignore any input aspect ratio and stretch the video to the output width and height. Ignore the WidthControlMode and HeightControlMode properties (consider them both as Fixed).

STRETCHMODE_FITWIDTH        

Resize the video by preserving the aspect ratio and fit to width. This might cause colored bars on top and bottom of the video or it can cause the top and bottom of the video to be truncated.

STRETCHMODE_FITHEIGHT 

Resize the video by preserving the aspect ratio and fit to height. This might cause colored bars on left and rigth side of the video or it can cause the left and right side of the video to be truncated.

STRETCHMODE_FIT

Resize the video by preserving the aspect ratio and fit both width and height inside the output rectangle. This might add colored bars on the edges.

STRETCHMODE_ENLARGEDFIT

Resize the video by preserving the aspect ratio and enlarging the width or height so the output rectangle fits inside the resulting output. (This is the default resize mode performed by the DirectShow® renderers). This might cause video edges to be cropped.

SizeControlModeConstants:

typedef enum 
{ 
   SIZECONTROL_FIXED, 
   SIZECONTROL_ADJUSTABLE, 
} SizeControlModeConstants; 

Constant

Description

SIZECONTROL_FIXED

Keep the output size (width or height) fixed.

SIZECONTROL_ADJUSTABLE

You can adjust the output size (width or height) to preserve the input aspect ratio.

SquarePixelOutputModeConstants:

typedef enum 
{ 
   SQUAREPIXELOUTPUT_SAMESIZE, 
   SQUAREPIXELOUTPUT_FITWIDTH, 
   SQUAREPIXELOUTPUT_FITHEIGHT, 
   SQUAREPIXELOUTPUT_INCREASESIZE, 
   SQUAREPIXELOUTPUT_DECREASESIZE, 
} SquarePixelOutputModeConstants; 

Constant

Description

SQUAREPIXELOUTPUT_SAMESIZE

Keep the output size unchanged. This might distort the output.

SQUAREPIXELOUTPUT_FITWIDTH

Keep the output width the same and modify the output height to preserve the visual output ratio.

SQUAREPIXELOUTPUT_FITHEIGHT

Keep the output height the same and modify the output width to preserve the visual output ratio.

SQUAREPIXELOUTPUT_INCREASESIZE

Increase the video size (width or height) so the requested output size fits inside the new output size. (This is the default resizing performed by the DirectShow video renderers).

SQUAREPIXELOUTPUT_DECREASESIZE

Decrease the video size (width or height) so the new output size fits inside the requested output size.

LMVResize_APILEVEL:

typedef enum 
{ 
   LMVResize_APILEVEL_1 = 0, 
   LMVResize_APILEVEL_2 = 1, 
} LMVResize_APILEVEL; 

 

Constant

Description

LMVResize_APILEVEL_1

Use the defaults from the previous versions of the resize filter.

LMVResize_APILEVEL_2

Use the defaults from the current version of the resize filter.

AutoResizeModeConstants (obsolete, you should use StretchModeConstants instead):

typedef enum 
{ 
   AUTORESIZEMODE_INCREASE  = 0x00, 
   AUTORESIZEMODE_FITWIDTH  = 0x00, 
   AUTORESIZEMODE_DECREASE  = 0x01 
   AUTORESIZEMODE_FITHEIGHT = 0x01 
} AutoResizeModeConstants; 

Holds auto resizing mode constants

Constant

Description

AUTORESIZEMODE_INCREASE

Obsolete

AUTORESIZEMODE_DECREASE

Obsolete

AUTORESIZEMODE_FITWIDTH

The height will be changed according to the width.

AUTORESIZEMODE_FITHEIGHT

The width will be changed according to the height.

Properties:

Type

Name

Description

VARIANT_BOOL

Enabled

VARIANT_TRUE to enable resizing.

VARIANT_BOOL

EnableQuickResize

VARIANT_TRUE to enable predefined ratios selection.

VARIANT_BOOL

AspectRatio

Obsolete property, use StretchMode instead.

VARIANT_TRUE to preserve the size aspect ratio, if the filter input is not connected, no aspect ratio is used.

VARIANT_BOOL

AutoStop

If VARIANT_TRUE, allows the graph to be stopped automatically. This is necessary when the dimensions change while the graph is running. The graph needs to be re-run after the change is applied.

long

Width

New width to use.

long

Height

New height to use.

QUICKRESIZE

QuickResize

If EnableQuickResize is VARIANT_TRUE, this property must be set to one of the QUICKRESIZE constants. When using the QUICKRESIZE constants the Width and Height properties are ignored.

SIZETYPES

Flags

One of the SIZETYPES constants, which specify the algorithm used for resizing.

VARIANT_BOOL

IsLEADInputPinConnected

Read only. Returns VARIANT_TRUE if the filters input pin is connected.

VARIANT_BOOL

IsLEADOutputPinConnected

Read only; returns VARIANT_TRUE if the filters output pin is connected.

long

InWidth

Read only; the input stream width.

long

InHeight

Read only; the input stream height.

long

OutWidth

Read only; the output stream width.

long

OutHeight

Read only; the output stream height.

long

InBits

Read only; the input stream bits per pixel.

long           

OutBits

Read only; the output stream bits per pixel.

VARIANT_BOOL

AutoSize

Obsolete property, use WidthControlMode and HeightControlMode instead.

If selected, preserves the actual video size aspect ratio. If the width changes then the height will be changed as well.

long

FillColor

The color that will be used to fill the different size.

AutoResizeModeConstants

AutoResizeMode

Obsolete property, use StretchMode instead.

A value that represents the auto resize mode. It must be one of AutoResizeModeConstants values.

InputAspectRatioMode

InputAspectRatioModeConstants

Use this property to specify whether to use the video input aspect ratio or override it.

CustomInputAspectRatioWidth

long

Width component for custom aspect ratio. Used only if

InputAspectRatioMode is set to INPUTASPECTRATIO_CUSTOM.

CustomInputAspectRatioHeight

long

Height component for custom aspect ratio. Used only if

InputAspectRatioMode is set to

INPUTASPECTRATIO_CUSTOM. 

OutputAspectRatioMode

OutputAspectRatioModeConstants

Use this property to specify the desired output aspect ratio. 

CustomOutputAspectRatioWidth

long

Width component for custom aspect ratio. Used only if

OutputAspectRatioMode is set to OUTPUTASPECTRATIO_CUSTOM.

CustomOutputAspectRatioHeight

long

Height component for custom aspect ratio. Used only if

OutputAspectRatioMode is set to OUTPUTASPECTRATIO_CUSTOM. 

StretchMode

StretchModeConstants

Allows you to specify whether the input should be stretched to the output or whether the aspect ratio should be preserved.

WidthControlMode 

SizeControlModeConstants 

Specifies whether the filter can modify the output width if necessary to preserve the input aspect ratio. This property is ignored if StretchMode is set to STRETCHMODE_STRETCH.

HeightControlMode

SizeControlModeConstants

Specifies whether the filter can modify the output height if necessary to preserve the input aspect ratio. This property is ignored if StretchMode is set to STRETCHMODE_STRETCH.

SquarePixelOutputMode

SquarePixelOutputModeConstants 

Specifies what to do if the output does not have square pixels and the downstream filter does not preserve the aspect ratio. This setting allows you to specify how to modify the output width and height if the downstream filter insists on a square pixel output. This option overrides the WidthControlMode and HeightControlMode properties. (In other words, this indicates what should be down if the output media type is not VIDEOINFO2).

ForceSquarePixelOutput

VARIANT_BOOL

Force the output to be square pixels (VIDEOINFO). In this case, the output might be resized as specified by the SquarePixelOutputMode property.

Interface Methods

HRESULT  StartChangingAttributes ()

Parameters

None.

Description

Call this method when you are about to change the resize attributes. The changes take effect when StopChangingAttributes is called with bCancelChanges set to VARIANT_FALSE.

Returns

S_OK if connected, S_FALSE otherwise.

HRESULT   StopChangingAttributes (VARIANT_BOOL bCancelChanges)

Parameters

bCancelChanges

Description

Sets the resize attributes. Set to VARIANT_FALSE to set the resize attributes. Use VARIANT_TRUE to reset the resize attributes to the old one.

Returns

S_OK if connected, S_FALSE otherwise.

HRESULT  ResetToDefaults ()

Parameters

None.

Description

This method is now obsolete. Call ResetToDefaultsEx(LMVResize_APILEVEL_1) instead.

Resets resizing to default values from the previous version of the filter.

Returns

S_OK if connected, S_FALSE otherwise.

HRESULT  ResetToDefaultsEx (LMVResize_APILEVEL ApiLevel)

Parameters

LMVResize_APILEVEL ApiLevel.

Description

Resets resizing to default values. The ApiLevel determines which default values to use. Current applications should set ApiLevel to LMVResize_APILEVEL_2 = 1.

The resize filter might change in the future and have different properties or default behaviour. Calling this method ensure the filter will have the same default values as they were at the time you developed your application.

It is recommended you call ResetToDefaultsEx(LMVResize_APILEVEL_2) before you start setting properties and start calling other methods for this interface.

Returns

S_OK if connected, S_FALSE otherwise.

For more information on how the filter's properties are used during the resizing process, please see the Notes and Comments section of the LEAD Video Resize Filter User Interface (2.0) topic.

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