MF_QUALITY_LEVEL enumeration

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          = 0x0,
  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

Normal quality.

MF_QUALITY_NORMAL_MINUS_1

One level below normal quality.

MF_QUALITY_NORMAL_MINUS_2

Two levels below normal quality.

MF_QUALITY_NORMAL_MINUS_3

Three levels below normal quality.

MF_QUALITY_NORMAL_MINUS_4

Four levels below normal quality.

MF_QUALITY_NORMAL_MINUS_5

Five levels below normal quality.

MF_NUM_QUALITY_LEVELS

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

See also

IMFQualityAdvise

Media Foundation Enumerations