Vela 2000-0422 Installation And User Manual - Error Reporting
Chapter 2 — Overview and Operation
135
MPEG Decoder Playback Errors
After the host receives Condition Met, the host should queue up the next playback
(i.e.
RESET
BUFFER
command, new MPEG data, and a new
PLAY
AUDIO
/
VIDEO
com-
mand). The amount of time the host has to set up the next playback is two frames
plus the amount of post-black set in the most recent
PLAY
AUDIO
/
VIDEO
command.
MPEG WRITE while not playing
This is a fatal playback error, in which the decoder informs the host system that
playback is not active. If a
WRITE
is received when the decoder is not playing a
stream, the following error will be returned:
“Illegal request, write protected — MPEG Write while not playing.”
This will occur when:
• Playback has stopped and an
MPEG
WRITE
was received.
• If more than fifty-five 64-K buffers are loaded between a
RESET
BUFFER
and
the
MPEG
PLAY
command.
Error Reporting
Reporting of MPEG Errors must be enabled using
DECODER
command with code
002Bh Error Mask.
To enable error reporting, set the bit to “1” in the 32-bits of data. A “0” disables
error reporting.
SCSI Status
Check Condition
Sense Key
5h
Additional Sense Code and Qualifier
2700h
Bit
10
Genlock loss reporting
11
MPEG decoder rate buffer read/write pointer collisions
12
Audio channel buffer warnings
13
MPEG decoder warnings
14
Video channel buffer warnings
15
Lip sync status