RIVA128ZX datasheet(42/85 Pages) STMICROELECTRONICS

42 / 85 page

128-BIT 3D MULTIMEDIA ACCELERATOR

RIVA128ZX

42/85

VIDEO PLAYBACK ARCHITECTURE

The RIVA128ZX video playback architecture is

designed to allow playback of CCIR PAL or NTSC

video formats with the highest quality while requir-

ing the smallest video surface. The implementa-

tion is optimized around the Windows 95 Direct

Video and ActiveX APIs, and supports the follow-

ing features:

• Accepts interlaced video fields:

- This allows the off-screen video surface to

consume less memory since only one field

(half of each frame) is stored. Double buffer-

ing between fields is done in hardware with

‘temporal averaging’ being applied based on

intraframing.

• Linestore:

- To support high quality video playback the

RIVA128ZX memory controller and video

overlay engine supports horizontal and verti-

cal interpolation using a 3x2 multitap interpo-

lating filter with image sharpening.

• YUV to RGB conversion:

- YUV 4:2:2 format to 24-bit RGB true-color

- Chrominance optimization/user control

• Color key video composition

Figure 43.

Video scaler pipeline

YUV

Vertical

Interpolation

Filter

(Smooth/Sharpen)

Color Space

Conversion to 24-bit

RGB

Horizontal

Interpolation

24-bit RGB

Video output

Video windowing, merge

with graphics pixel pipeline

Linestore

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