[x264-devel] Re: static's

[Tuukka Toivonen]

On Tue, 19 Apr 2005, Tom Jacobs wrote:

> the main variable i am having trouble with is static int16_t *p_cost_mv[52];
> in x264_mb_analyse_load_costs() in analyse.c.  here the encoder breaks when
> the static is removed from the variable. is this arrays data reused each
> time the function is called?

Yes. It contains some precalculated arrays for motion estimation
(MV length -> lambda * number of bits mapping),
which depend on the current QP value. If the same QP values are
used many times (very probably), the array needs not to be
recalculated again. On the other hand, memory and time are saved
as the arrays are not calculated for all QP values in the beginning
of the program, but only when needed.

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