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doc/utils/eval: clarify meaning of random* seed value 

Possible address trac issue:
http://trac.ffmpeg.org/ticket/10763
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Stefano Sabatini 2024-01-01 20:38:03 +01:00
parent 993c231de0
commit 8ceb37d5ad
1 changed files with 12 additions and 0 deletions
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doc/utils.texi
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@ -944,11 +944,23 @@ Return a pseudo random value between 0.0 and 1.0. @var{idx} is the
index of the internal variable which will be used to save the
seed/state.
To initialize the seed, you need to store the seed value as a 64-bit
unsigned integer in the internal variable with index @var{idx}.
For example, to store the seed with value @code{42} in the internal
variable with index @code{0} and print a few random values:
@example
st(0,42); print(random(0)); print(random(0)); print(random(0))
@end example
@item randomi(idx, min, max)
Return a pseudo random value in the interval between @var{min} and
@var{max}. @var{idx} is the index of the internal variable which will
be used to save the seed/state.
To initialize the seed, you need to store the seed value as a 64-bit
unsigned integer in the internal variable with index @var{idx}.
@item root(expr, max)
Find an input value for which the function represented by @var{expr}
with argument @var{ld(0)} is 0 in the interval 0..@var{max}.