Mostly based on libavcodec's

Since we do not support "standalone" filters not attached to an
AVFilterGraph, we should not have a public function to create such
filters. In addition that function is horribly named, the action it does
cannot be possibly described as "opening" a filter.

Some filters need several input frames before producing output.
For these filter, it becomes simpler to return 0 in
request_frame() and let the framework call it again until
output has been produced.

Deprecate AVFilterBuffer/AVFilterBufferRef and everything related to it
and use AVFrame instead.

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

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

Based on patch by Anton Khirnov
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

With this we can mix filters using filter_frame OR start/draw_slice/end

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

Based on patch by Anton Khirnov
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.

Implement av_buffersink_read() and av_buffersink_read_samples()
for ffmpeg's version of buffersink.

With this change, avconv linked against ffmpeg's libraries passes
the same number of tests whether it uses ffbuffersink or
buffersink_old.

The macro can be used to define consistently the internal class of a
filter, save some typing and factorize.

This breaks libavfilter ABI.

This is more consistent with naming in the rest of Libav.

It will allow adding new fields to it without ABI breaks.

The enabling symbol is renamed FF_AVFILTER_TRACE. Avoid conflicts with
the DEBUG macro, which may be defined for different purposes.

Its only used through the start_frame pointer and thus cannot be inlined easily.
It also appears to break compilation with some unidentified compiler on darwin.

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

These utilities are meant to be defined in avfilter.c, since they are
generic and thus contain both audio and video code.

They are only useful inside filters and we don't allow user filters for
now.

They are only useful inside filters and we don't allow user filters for
now.

They are not used outside of avfiltergraph.c

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

The planar/packed switch and the packing_formats list is no longer
required, since the planar/packed information is now stored in the sample
format enum.

This is technically a major API break, possibly it should be not too
painful as we marked the audio filtering API as unstable.

This is easier to follow than having them randomly scattered in
avfilter.c and defaults.c.

Also add internal function ff_null_start_frame_keep_ref().

Fix crash when a following filter (e.g. settb) will unref the reference
passed by start_frame(), and then the reference is accessed in
end_frame() through inlink->cur_buf.

Keep a heap of all sink links ordered by timestamps.

This should fix a memleak.

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

A list of formats may have been dynamically created by the calling code,
and thus should not be referenced by the sink buffer context.

Avoid possible invalid data reference.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Also consistent with AVCodecContext.sample_rate. Simplify/avoid
pointless type checks and conversions.

Breaks audio API/ABI.

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

Reduce code duplication.

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

Also generalize it, making it accept ints rather than pixel formats.
Allow factorization.

Adopt K&R style for overall consistency/readability.

Add missing multiple inclusion guards; clean up #endif comments;
add missing library prefixes; keep guard names consistent.

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

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

This removes ff_get_ref_perms_string, ff_dprintf_ref and ff_dprintf_link
fro the interface of libavfilter.

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit eb7ccf8f33)