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MF_QUALITY_DROP_MODE enumeration (mfidl.h)

  • Article

Specifies how aggressively a pipeline component should drop samples.

Syntax

typedef enum _MF_QUALITY_DROP_MODE {
  MF_DROP_MODE_NONE = 0,
  MF_DROP_MODE_1 = 0x1,
  MF_DROP_MODE_2 = 0x2,
  MF_DROP_MODE_3 = 0x3,
  MF_DROP_MODE_4 = 0x4,
  MF_DROP_MODE_5 = 0x5,
  MF_NUM_DROP_MODES = 0x6
} MF_QUALITY_DROP_MODE;

Constants

 
MF_DROP_MODE_NONE
Value: 0
Normal processing of samples. Drop mode is disabled.
MF_DROP_MODE_1
Value: 0x1
First drop mode (least aggressive).
MF_DROP_MODE_2
Value: 0x2
Second drop mode.
MF_DROP_MODE_3
Value: 0x3
Third drop mode.
MF_DROP_MODE_4
Value: 0x4
Fourth drop mode.
MF_DROP_MODE_5
Value: 0x5
Fifth drop mode (most aggressive, if it is supported; see Remarks).
MF_NUM_DROP_MODES
Value: 0x6
Maximum number of drop modes. This value is not a valid flag.

Remarks

In drop mode, a component drops samples, more or less aggressively depending on the level of the drop mode. The specific algorithm used 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.

For example, suppose an encoded video stream has three B-frames between each pair of P-frames. A decoder might implement the following drop modes:

  • Mode 1: Drop one out of every three B frames.
  • Mode 2: Drop one out of every two B frames.
  • Mode 3: Drop all delta frames.
  • Modes 4 and 5: Unsupported.
The enhanced video renderer (EVR) can drop video frames before sending them to the EVR mixer.

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