[M4IF Technotes] resync_marker emulation

[Dhinesh]

Dear experts,
Reference : Section "6.2.7 Block - ISO/IEC 14496-2:2001(E)"
"In Block decoding if the dct_dc_size_chrominance > 8  a marker_bit
 is inserted to avoid the resync_marker emulation."
If the encoders follow the above statement,
it will still lead to resync_marker emulation in some cases as explained
below.
We fould atleast two cases,
in case the first part of the emulated resync_marker starts at
byte-boundary.
Should the encoder take care of this emulation problem by
re-encoding the probematic-macroblock/block with changed parameters
to avoid emulation?
	or
Replace the text in the Section "6.2.7 Block - ISO/IEC 14496-2:2001(E)"
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"In Block decoding if the dct_dc_size_chrominance > 8
 a marker_bit is inserted to avoid the resync_marker emulation."
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with
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" dct_dc_size_chrominance >= 8 "
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EMULATION COMBINATION - 1
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First part of the emulated resync_marker
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Table B-16 -- VLC Table for Intra Luminance and Chrominance TCOEF
VLC-CODE	LAST	RUN	LEVEL
0010 000s	1	4	1
Second part of the emulated resync_marker
-----------------------------------------
Table B-14 -- Variable length codes for dct_dc_size_chrominance
Variable-length-code	dct_dc_size_chrominance
0000 0000 0001			12
	TCOEF	   dct_dc_size_chrominance
	(s = 0)
	0010 0000    0000 0000 0001
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EMULATION COMBINATION - 2
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First part of the emulated resync_marker
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Table B-15 -- Differential DC additional codes
Additional-code		Differential-DC		Size
00000000 to 01111111	-255 to -128		8
Second part of the emulated resync_marker
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Table B-16 -- VLC Table for Intra Luminance and Chrominance TCOEF
VLC-CODE	LAST	RUN	LEVEL
0000 0000 111s	0	0	21
or
0000 0000 110s	0	0	22
or
0000 0000 101s	1	0	 6
or
0000 0000 100s	1	0	 7
	Differential-DC     TCOEF
	(-255)
	00000000 	   0000 0000 111s
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Waiting for comments .
Best Regards
Dhinesh