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4/8/2010

This structure describes a quality message by indicating Flood or Famine in the renderer and specifying the percentage of frames to drop or add to optimize the renderer's performance.

Syntax 

typedef struct{
  QualityMessageType 
Type;
  long 
Proportion;
  REFERENCE_TIME 
Late;
  REFERENCE_TIME 
TimeStamp;
} Quality;

Members

Type

Either Famineor Flood, indicating that a downstream filter needs more or less data.

Proportion

Value that specifies the rate at which DirectShow should continue to send media samples.

The base value is 1000, which indicates there should be no change.

A percentage increase or decrease from 1000 indicates the percentage of frames to add or drop.

If this value is 800, for example, DirectShow will drop 20 percent of the incoming frames to match the renderer's speed.

Late

If a famine exists downstream, this is the amount of time by which the stream is lagging.

TimeStamp

Value that specifies the time when DirectShow created this structure, which is usually the start time on a video sample.

Requirements

Header dshow.h
Windows Embedded CE Windows CE 2.12 and later
Windows Mobile Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later
Note Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements
For more information, see Setting Up the Build Environment,
Version 2.12 requires DXPAK 1.0 or later

See Also