Per-Pixel Alpha Blending

This topic applies to Windows XP Home Edition and Windows XP Professional only.

Four new media subtypes have been defined for per-pixel alpha blending. These subtypes are only supported when the VMR is in mixing mode. The VMR will reject the connection if it is not in mixing mode when an upstream filter attempts to connect using one of these subtypes. These subtypes are defined in uuids.h:

• MEDIASUBTYPE_ARGB1555
• MEDIASUBTYPE_ARGB4444
• MEDIASUBTYPE_ARGB32
• MEDIASUBTYPE_AYUV

For more information on MEDIASUBTYPE_AYUV, see the DXVA documentation in the Microsoft Platform DDK.