Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Reviewed-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

They allow to implement the if/then/else logic, which cannot be
implemented otherwise.

For example the expression:
A*B + not(A)*C

always evaluates to NaN if B is NaN, even in the case where A is 0.

For some of the code e.g. doing timing measurements there is no
real point in running regression testing on it, thus it should
not be counted against coverage.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Found-by: Oded Shimon
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

example: -vf 'scale=256:256,mp=geq=gcd(X\,Y)-2:128:128'

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

useage example: -vf 'scale=256:256,mp=geq=random(1)/hypot(X-cos(N*0.07)*W/2-W/2\,Y-sin(N*0.09)*H/2-H/2)^2*1000000*sin(N*0.02):128:128'

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

sqrt(-1) returns "some NaN", it's not specified which exactly.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This prevents random values from the stack being used as
"variables" in expressions.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Fixes ticket264

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

It is a more search-friendly alternative to the ^ operator.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>

Signed-off-by: Mans Rullgard <mans@mansr.com>

eval API.

More grep-friendly and more consistent with the rest of the FFmpeg
API.

Originally committed as revision 25708 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 25666 to svn://svn.ffmpeg.org/ffmpeg/trunk

prefix does not contain other characters which may belong to an
identifier.

This allows to distinguish for example to have different constants
with the same prefix (e.g. "foo" and "foobar").

Originally committed as revision 25626 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 25625 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 25624 to svn://svn.ffmpeg.org/ffmpeg/trunk

The pointer to the char ';' has to be increased before to evaluate
";E2".

Originally committed as revision 25623 to svn://svn.ffmpeg.org/ffmpeg/trunk

errors, far from being a complete test system.

Originally committed as revision 23635 to svn://svn.ffmpeg.org/ffmpeg/trunk

the provided expression.

Allow detection of mistyped expressions.

Originally committed as revision 23629 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23627 to svn://svn.ffmpeg.org/ffmpeg/trunk

API public.

Originally committed as revision 23485 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23406 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 23405 to svn://svn.ffmpeg.org/ffmpeg/trunk

Make me and Diego happy.

Originally committed as revision 23404 to svn://svn.ffmpeg.org/ffmpeg/trunk

const_name    -> const_names
const_value   -> const_values
func[12]_name -> func[12]_names
func[12]      -> funcs[12]

All these parameters contain a list of values, using plural names for
them help understanding a little.

Originally committed as revision 23403 to svn://svn.ffmpeg.org/ffmpeg/trunk

containing an error code.

Allow these functions to convey the reason of the failure to the
calling function, failure which is not always due to a parsing error
but it may depend for example on a memory problem.

Also fix several potential memleaks.

Originally committed as revision 23402 to svn://svn.ffmpeg.org/ffmpeg/trunk