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MF_QUALITY_LEVEL enumeration (mfidl.h)

  • Article

Specifies the quality level for a pipeline component. The quality level determines how the component consumes or produces samples.

Syntax

typedef enum _MF_QUALITY_LEVEL {
  MF_QUALITY_NORMAL = 0,
  MF_QUALITY_NORMAL_MINUS_1 = 0x1,
  MF_QUALITY_NORMAL_MINUS_2 = 0x2,
  MF_QUALITY_NORMAL_MINUS_3 = 0x3,
  MF_QUALITY_NORMAL_MINUS_4 = 0x4,
  MF_QUALITY_NORMAL_MINUS_5 = 0x5,
  MF_NUM_QUALITY_LEVELS = 0x6
} MF_QUALITY_LEVEL;

Constants

 
MF_QUALITY_NORMAL
Value: 0
Normal quality.
MF_QUALITY_NORMAL_MINUS_1
Value: 0x1
One level below normal quality.
MF_QUALITY_NORMAL_MINUS_2
Value: 0x2
Two levels below normal quality.
MF_QUALITY_NORMAL_MINUS_3
Value: 0x3
Three levels below normal quality.
MF_QUALITY_NORMAL_MINUS_4
Value: 0x4
Four levels below normal quality.
MF_QUALITY_NORMAL_MINUS_5
Value: 0x5
Five levels below normal quality.
MF_NUM_QUALITY_LEVELS
Value: 0x6
Maximum number of quality levels. This value is not a valid flag.

Remarks

Each successive quality level decreases the amount of processing that is needed, while also reducing the resulting quality of the audio or video. The specific algorithm used to reduce quality depends on the component. Mode 1 is the least aggressive mode, and mode 5 is the most aggressive. A component is not required to implement all five levels. Also, the same quality level might not be comparable between two different components.

Video decoders can often reduce quality by leaving out certain post-processing steps. The enhanced video renderer (EVR) can sometimes reduce quality by switching to a different deinterlacing mode.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2008 [desktop apps | UWP apps]
Header mfidl.h

See also

IMFQualityAdvise

Media Foundation Enumerations