Signed-off-by: Paul B Mahol <onemda@gmail.com>

Set select->select internally to the function, avoid lossy double->int
conversion causing spurious frame drop (e.g. in case the evaluation
result is positive and less than 1).

dsputil_init() is deprecated and not meant to be exported.
ff_dsputil_init() is internal to libavcodec and thus can not be used.
avpriv_dsputil_init() is the version shared between libraries.

This commit fixes 3 unjustified libavfilter deprecated warnings.

This is mostly automated global search and replace

The deprecated aconvert filter is disabled, if it still has users
it should be updated

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

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

In particular, fix trac ticket #2248.

Also log scene value. Improve debugging.

Add options introspection, and improve error feedback.

The variable is now used also for audio frames.

The file now contains also an audio select implementation. Also move the
aselect/select documentation from video filters to the multimedia filters
section.

Simplify.

The new code reads the input frame when its ready, the previous
code did read the input frame during start_frame at which point it
may not yet be available.

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

Any alleged performance benefits gained from the split are purely
mythological and do not justify added code complexity.

Also make sure we use the actual width of the image and not the whole
linesize.

A number of compilers, for example those from TI and IBM, choke on
these initialisers.  The current style is also quite ugly.

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

This avoid a crash when the filter fails before config_input(),
typically with a syntax error in the next filter:
    select=gt(scene\,.4),select=fail

This is only necessary because of the poll_frame implementation.
Removing it altogether would be another solution.

Signed-off-by: Martin Storsjö <martin@martin.st>

This reduces code duplication and prevents stale pointers from remaining
on the link.

It is not used in any filters currently and is inherently evil. If
passing binary data to filters is required in the future, it should be
done with some AVOptions-based system.