MF_QUALITY_DROP_MODE Enumeration

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

Constant	Description
MF_DROP_MODE_NONE	Normal processing of samples. Drop mode is disabled.
MF_DROP_MODE_1	First drop mode (least aggressive).
MF_DROP_MODE_2	Second drop mode.
MF_DROP_MODE_3	Third drop mode.
MF_DROP_MODE_4	Fourth drop mode.
MF_DROP_MODE_5	Fifth drop mode (most aggressive, if it is supported; see Remarks).
MF_NUM_DROP_MODES	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

Header: Declared in mfidl.h.