Billy, PC98 requirements:..........
Take a look at the MPEG2 decoder requirements...
developer.intel.com
9. Background tasks do not interfere with MPEG-2 playback
Consumer PC 98 Office PC 98 Entertainment PC 98
Required Recommended Required
This requirement applies to back-ground tasks initiated by applications included with the PC. Video performance should be such that non-foreground tasks-such as downloading a web page or using answering-machine software-should occur without disrupting video playback, including DVD and television. When the user runs an application in the foreground that requires significant system resources, such as a game or video answering machine, the system should degrade gracefully.
For Consumer PC 98, this requirement applies only to applications that are started automatically by the OEM software pre-configuration, such as programs in the Windows/Start Menu/Programs/Startup folder. This guarantees that the video experience "out of the box" is as good or better than consumer television and other A/V components.
For Entertainment PC 98, this requirement applies to all applications included with the system, whether run automatically by the OEM software pre-configuration or run only by the user. This is a critical requirement for Entertainment PC 98 systems, whose users will rely on the PC to perform normal day-to-day operations simultaneously with DVD-Video playback and television.
Specific examples of operations that must not interfere with MPEG-2 playback include the following:
ú Answering the telephone to receive voice mail or fax. This applies only to telephony software included with the PC, not third-party software installed by the user. Notice that telephone answering must not be auto-matically disabled during MPEG-2 playback unless explicitly configured by the user.
ú Running scheduled communications tasks such as automatic connection using the modem or ISDN to transfer e-mail and faxes, download cached Internet content, and so on.
Note: Programs that make intensive use of system resources or that are designed for interactive foreground operation are excluded from this requirement. This includes games, video and audio playback, speakerphone, and disk utilities such as error checking, defragmentation, and virus protection.
Notice also that for software decoder implementations, compliance testing for the Entertainment PC 98 requirement will begin in a reasonable time frame after enhanced kernel-mode support is provided for MPEG-2 video playback in the Windows operating system.
12. MP-G 2 playback meets PC 98 requirements
Consumer PC 98 Office PC 98 Entertainment PC 98
Required Required with DVD-Video Required
All MPEG-2 decoder implementations-whether implemented as hardware, software, or a combination of both-must be capable of the following:
ú MPEG-2 Main Profile at Main Level (MP@ML) playback, with no dropped frames. Playback requirements include full-frame rate decode of MPEG-2 MP@ML input streams, up to and including the following frame sizes and rates:
72 x 480 at 60 fields per second 720 x 480 at 24 frames per second
720 x 576 at 50 fields per second 720 x 576 at 24 frames per second
Decoded frame rate is measured at the graphics frame buffer. The actual rate at which video is displayed (or rendered) is covered in the following requirement for smooth frame delivery.
ú Smooth frame delivery. Video frames must be displayed within one-half frame of the intended display time. This requirement is satisfied for imple-men-tations in which video frames are completely rendered into a DirectDraw surface and flipped using the DirectDraw Flip API or a hardware autoflip within one-half frame of the intended display time.
It is generally accepted in the video broadcast industry that any level of frame slippage or jitter will be noticeable to viewers and will be considered an annoyance compared to the smooth viewing experience provided by standard broadcast television, VCRs, and so on.
ú Rates for decoding and displaying data. This requires MPEG-2 data rates of up to 9.8 Mb/s for Consumer PC 98 and Office PC 98, and 15 Mb/s for Entertainment PC 98.
ú Synchronized audio and video. Audio and video must be synchronized to within one video frame.
ú Proper handling of field-based content. This requirement includes the dynamic field/frame switching capability.
ú No tearing. This requires proper video buffering, such as double buffering.
ú Correct display of multiple aspect ratio content. This requirement includes support for Pan Scan and letterbox-formatted content.
ú Closed captioning support. Line 21 data must be parsed out of the extension_and_user_data and made available for decoding for both DVD and digital broadcast satellite line 21 syntax.
ú Output of all remaining frames at the end of the data sequence. This requirement ensures output of all remaining frames when the decoder receives one of the following:
ú A sequence_end_code message (which differs from an Ipin::EndOfStream() function call)
ú A time discontinuity
ú Splicing MPEG. Decoders must properly interpret the Closed_Gop flag by dropping B frames before the first I frame after either a data discontinuity is received or the Broken_Link flag is set.
Notice the related video and MPEG-2 support requirements for graphics adapters, such as YUV (4:2:0 and 4:2:2) off-screen overlay surface and up/down bilinear interpolated scaling as defined in the "Hardware Acceleration for Video Playback" section in the "Graphics Adapters" chapter in Part 4 of this guide.
19. System provides a licensed CSS copyright protection scheme
Required
The system must provide a licensed copy scramble system (CSS) implementation and support for CSS encoded DVD-Video discs to ensure proper protection for content produced in accordance with CSS, including regionalization and analog video protection/analog protection system (APS).
To facilitate the authentication process required by this scheme, software is provided as part of the Windows and Windows NT operating system support for DVD. This allows a DVD-ROM drive to authenticate and transfer keys with a CSS decrypter. Windows and Windows NT operating system software will act as the agent to allow either hardware or software decrypters to be authenticated.
For more information about copyright protection requirements, see the "Storage and Related Peripherals" chapter in Part 4 of this guide. For information about CSS or to obtain a CSS license, contact MEI (see mei.co.jp), or contact the CSS licensing entity when it is established. |
