[FFmpeg-devel] [PATCH 2/2] eval: Allow specifying the variable id.

[Michael Niedermayer]

On Wed, Feb 22, 2012 at 10:27:19PM +0100, Nicolas George wrote:
> Le quartidi 4 ventôse, an CCXX, Michael Niedermayer a écrit :
> > Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> > ---
> >  doc/eval.texi    |    5 +++--
> >  libavutil/eval.c |   12 ++++++++----
> >  2 files changed, 11 insertions(+), 6 deletions(-)
> > 
> > diff --git a/doc/eval.texi b/doc/eval.texi
> > index b481bfe..c4a8ac5 100644
> > --- a/doc/eval.texi
> > +++ b/doc/eval.texi
> > @@ -107,9 +107,10 @@ the evaluation of @var{y}, return 0 otherwise.
> >  Evaluate @var{x}, and if the result is zero return the result of the
> >  evaluation of @var{y}, return 0 otherwise.
> >  
> > - at item taylor(expr, x)
> > + at item taylor(expr, x) taylor(expr, x, id)
> >  Evaluate a taylor series at x.
> > -expr represents the LD(0)-th derivates of f(x) at 0.
> > +expr represents the LD(id)-th derivates of f(x) at 0. If id is not specified
> > +then 0 is assumed.
> >  note, when you have the derivatives at y instead of 0
> >  taylor(expr, x-y) can be used
> >  When the series does not converge the results are undefined.
> > diff --git a/libavutil/eval.c b/libavutil/eval.c
> > index d1d2cec..0061e22 100644
> > --- a/libavutil/eval.c
> > +++ b/libavutil/eval.c
> > @@ -184,18 +184,19 @@ static double eval_expr(Parser *p, AVExpr *e)
> >          case e_taylor: {
> >              double t = 1, d = 0, v;
> >              double x = eval_expr(p, e->param[1]);
> > +            int id = e->param[2] ? eval_expr(p, e->param[2]) : 0;
> 
> av_clip(eval..., 0, VARS - 1)?

added, applied
thx

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Republics decline into democracies and democracies degenerate into
despotisms. -- Aristotle
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