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DECIMATION_USAGE enumeration (strmif.h)

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Describes the strategy that the Overlay Mixer Filter filter uses to scale the video image down to a smaller size.

Syntax

typedef enum _DECIMATION_USAGE {
  DECIMATION_LEGACY = 0,
  DECIMATION_USE_DECODER_ONLY,
  DECIMATION_USE_VIDEOPORT_ONLY,
  DECIMATION_USE_OVERLAY_ONLY,
  DECIMATION_DEFAULT
} DECIMATION_USAGE;

Constants

 
DECIMATION_LEGACY
Value: 0
Decimate the video by taking the following steps, in the order listed, until one of them succeeds.


  1. Try to use the overlay scaler on the VGA chip.

  2. If the Overlay Mixer is connected through a video port, try to use the scaler on the video port.

  3. Crop the video image.
DECIMATION_USE_DECODER_ONLY
Decimate using the scaler on the video decoder. If that fails, crop the video image.
DECIMATION_USE_VIDEOPORT_ONLY
Decimate using the scaler on the video port. If that fails, crop the video image.
DECIMATION_USE_OVERLAY_ONLY
Decimate using the overlay scaler on the VGA chip. If that fails, crop the video image.
DECIMATION_DEFAULT
Decimate the video by taking the following steps, in the order listed, until one of them succeeds.


  1. Try to use the scaler on the video decoder.

  2. Try to use the overlay scaler on the VGA chip.

  3. If the Overlay Mixer is connected through a video port, try to use the scaler on the video port.

  4. Crop the video image.


This mode is the default decimation strategy.

Requirements

   
Header strmif.h (include Dshow.h)

See also

DirectShow Enumerated Types

IAMVideoDecimationProperties