// ksmedia.h

typedef enum {
  KS_CompressionCaps_CanQuality,
  KS_CompressionCaps_CanCrunch,
  KS_CompressionCaps_CanKeyFrame,
  KS_CompressionCaps_CanBFrame,
  KS_CompressionCaps_CanWindow
} KS_CompressionCaps;
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Windows Driver Kit DDI reference (ne-ksmedia-ks_compressioncaps)

KS_CompressionCaps enumeration

Description

The KS_CompressionCaps enumeration defines compression capabilities of a device.

Constants

`KS_CompressionCaps_CanQuality`

The video compressor supports quality settings.

`KS_CompressionCaps_CanCrunch`

The video compressor can compress the video to a specified data rate. If a minidriver supports this capability, the dwBitRate member of the KS_VIDEOINFOHEADER structure specifies the default data rate.

`KS_CompressionCaps_CanKeyFrame`

The video compressor supports a user-specified key-frame rate.

`KS_CompressionCaps_CanBFrame`

The video compressor supports a user-specified P frame interval. The frames that occur between the key frames and P frames are bidirectional (B) frames.

`KS_CompressionCaps_CanWindow`

The video compressor supports a user-specified window size (that is, the number of frames whose average size cannot exceed the specified data rate).

KS_CompressionCaps - NtDoc