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Prevent DAUD PCM encoder from fetching values outside of ff_reverse[] array bounds when input sample values are < 0.


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This changes add_to_pktbuf() to maintain a pointer to the last entry
in the list, avoiding a linear walk-through on each call.  Before this
change, add_to_pktbuf() could take a significant amount of time (10%
of total decoding time), even with input files of several minutes.
After the change, the time spent in this function is barely measurable
with oprofile.

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condition b == 0 could never be true, because it would 
have already been caught in the previous ifs. Also the 
condition b == 0x1000 could never be true (it would 
triggered the return).


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timebase in the video4linux2 v4l2_read_header() function.


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timebase in the video4linux grab_read_header() function.


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needs duplicating a few loops, but now the code is clearer.


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patch by Anton Khirnov  wyskas _at_ gmail _dot_ com


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SoC code.


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code


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