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2004 Jan 26 28
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
00 identification 0 to 7 55H; video
01 flags 0 ‘GOP start flag’; indicates that a GOP start code is present in the
sector
1 ‘GOP start header’; indicates that a group of GOPs starts in the
sector
2 ‘sequence end flag’; indicates that a sequence end code is
present in the sector
3 and 4 reserved
5 to 7 undefined
02 data length LSB 0 to 7 amount of non-stuffing bytes minus one
03 MSB 0 to 7
04 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.
05 0 to 7
06 0 to 7
07 MSB 0 to 7
08 picture start count 0 to 7 the amount of picture starts in the sector
09 picture types 0 and 1 1st picture type:
00: I picture
01: P picture
10: B picture
11: invalid type
2 reserved
4 and 5 2nd picture type:
00: I picture
01: P picture
10: B picture
11: invalid type
6 reserved
0A first picture position LSB 0 to 7 position (in bytes) of the first picture (or GOP or sequence) start
code in the sector
0B MSB 0 to 7
0C second picture position LSB 0 to 7 position (in bytes) of the second picture (or GOP or sequence)
start code in the sector
0D MSB 0 to 7
0E GOP header position LSB 0 to 7 position (in bytes) of the GOP start code in the sector, if present,
else 0000
0F MSB 0 to 7