SAA6752HSSLASHV103 datasheet(28/71 Pages) PHILIPS

28 / 71 page

2004 Jan 26

Philips Semiconductors

Product speciﬁcation

MPEG-2 video and MPEG-audio/AC-3

audio encoder with multiplexer

SAA6752HS

7.7.10

METABYTES DATA

In program stream and pack stream modes, the SAA6752HS can append additional metabyte data packets to the

stream, providing information on sector information for downstream application processing. The video and audio

metabytes format is defined in Tables 6 and 7. The sector and metabytes form a block format, where each sector of

2048 bytes is followed by 16 metabytes containing data on the previous sector.

Table 6

Video metabytes data

Note

1. This is the same value as used to generate the PTS and DTS values.

BYTE

(HEX)

NAME

LSB/

MSB

BIT

DESCRIPTION

identiﬁcation

0 to 7

55H; video

ﬂags

‘GOP start ﬂag’; indicates that a GOP start code is present in the

sector

‘GOP start header’; indicates that a group of GOPs starts in the

sector

‘sequence end ﬂag’; indicates that a sequence end code is

present in the sector

3 and 4 reserved

5 to 7

undeﬁned

data length

LSB

0 to 7

amount of non-stufﬁng bytes minus one

MSB

0 to 7

time stamp

LSB

0 to 7

The value of the STC at the moment that the ﬁrst byte of the ﬁrst

frame arrived at the input. Only 32 bits are used; note 1.

0 to 7

MSB

0 to 7

picture start count

0 to 7

the amount of picture starts in the sector

picture types

0 and 1 1st picture type:

00: I picture

01: P picture

10: B picture

11: invalid type

reserved

4 and 5 2nd picture type:

00: I picture

01: P picture

10: B picture

11: invalid type

reserved

ﬁrst picture position

LSB

0 to 7

position (in bytes) of the ﬁrst picture (or GOP or sequence) start

code in the sector

MSB

0 to 7

second picture position

LSB

0 to 7

position (in bytes) of the second picture (or GOP or sequence)

start code in the sector

MSB

0 to 7

GOP header position

LSB

0 to 7

position (in bytes) of the GOP start code in the sector, if present,

else 0000

MSB

0 to 7

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