User`s manual

134 Reference Manual
Pin Interfaces
The pins of ADLINK Hardware MPEG4 Device filter expose
Microsoft DirectShow interfaces: IAMBufferNegotiation, IAM-
StreamConfig, IAMStreamControl, IKsPin, IKsPropertySet, IStre-
amBuilder, IMediaSeeking, IPin, and IQualityControl. Follow the
links of the interfaces for further detail.
Alternatively, please visit http://msdn.microsoft.com/library/ and
from the left panel navigation, select Graphics and Multimedia ->
DirectX -> SDK Documentation -> DirectX 9.0 (C++) -> Direct-
Show -> DirectShow Reference -> Interfaces for a complete list of
standard DirectShow filter interfaces references.
6.3 OSD Programming
Introduction to OSD
OSD (On-Screen-Display) is supported by the ADLINK Hardware
MPEG4 Device. During the Motion Estimation and Compensation
(MEC) stage, firmware can load the OSD bitmap and overlay with
video, thus modifying output bitmap. By default, the ASCII bitmaps
are prepared at boot-up and saved in DRAM. Customers can also
choose or generate their own bitmaps, such as UNICODE. How-
ever, font base address space is limited to no more than 16-bit.
Drivers can download the customized bitmap font file or the
default font bitmap file into firmware, and enabled firmware to do
OSD bitmap overlap to show user required characters.