[FFmpeg-devel] [PATCH 2/2] lavfi/setpts: introduce rand() function in expression
Stefano Sabatini
stefasab at gmail.com
Tue Jan 2 23:12:44 EET 2024
On date Friday 2023-12-29 12:51:10 +0100, Stefano Sabatini wrote:
> On date Thursday 2023-12-28 22:25:08 +0100, Michael Niedermayer wrote:
> > On Thu, Dec 28, 2023 at 07:49:18PM +0100, Stefano Sabatini wrote:
> > > On date Thursday 2023-12-28 16:00:57 +0100, Stefano Sabatini wrote:
> > > > On date Thursday 2023-12-28 12:02:59 +0100, Andreas Rheinhardt wrote:
> > > > > Stefano Sabatini:
> > > > > > This is useful to simulate random jitter.
> > > > > > ---
> > > > > > Changelog | 1 +
> > > > > > doc/filters.texi | 10 +++++++++-
> > > > > > libavfilter/setpts.c | 39 +++++++++++++++++++++++++++++++++------
> > > > > > 3 files changed, 43 insertions(+), 7 deletions(-)
> > > [...]
> > > > > Why is this added here and not in lavu/eval so that it is available with
> > > > > all expressions?
> > > >
> > > > There is no specific reason. Sometimes you need to have a control over
> > > > the seed, in this case you need to provide the PRNG context.
> > > >
> > > > For the general case, probably we can place a global LFG in the eval
> > > > module and fetch its generated values.
> > >
> > > Another possible solution in attachment, leveraging the same affine
> > > PRNG used in random(). For other use cases you might need to use a
> > > high-quality PRNG and this might not be good enough.
> >
> > > eval.c | 18 +++++++++++++++---
> > > 1 file changed, 15 insertions(+), 3 deletions(-)
> > > 94413dcc88e3046b4987715f6c152aeb1c24c703 0001-lavu-eval-add-randomi-function-to-compute-random-val.patch
> > > From 4dc5213b0913a2585f75dfd03b497ca2efc093de Mon Sep 17 00:00:00 2001
> > > From: Stefano Sabatini <stefasab at gmail.com>
> > > Date: Thu, 28 Dec 2023 19:09:22 +0100
> > > Subject: [PATCH] lavu/eval: add randomi function to compute random value in
> > > interval
> >
> > probably ok if this is usefull
> >
> > thx
>
> Will apply the edited patch in a few days if I see no comments.
Applied.
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