[M4IF Technotes] parsing stuffings bits while reverse decodin g second partition in data_partitioning

[Nitin Gupta--DSP, Noida]

Hi,
	At the end of the video packet there is always
bit stuffing for byte alignment. So if u recieve
a "110" from the reverse direction then that has to
be a stuffing pattern of "011" .. 
Regards,
Nitin.
-----Original Message-----
From: Gaurav Aggarwal [mailto:guraaf   yahoo.co.in]
Sent: Wednesday, January 08, 2024 2:03 PM
To: Technotes
Subject: [M4IF Technotes] parsing stuffings bits while reverse decoding
second partition in data_partitioning
Hi,
I have a problem in understanding the reverse decoding of a stream
when data partitioning is used. Suppose we hit upon an error in the
forward direction while parsing the second partition of say an I-VOP
video packet. Now, we are supposed to go to the end of the video 
packet as identified by the start of a resync marker or a start code.
And we need to start decoding in the reverse direction from this
point.
The problem is, when we start from the reverse, how do we know
whether there is a stuffing bit pattern or not. That is to say, from
the byte aligned position where we start, if we receive say a "110"
(parsing stream in reverse direction), then is this a stuffing 
pattern of 011 or really the some RLVC code with sign '1' and first
two bits of the code as 10?
Any pointers will be appreciated.
Thanks,
Gaurav
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