Fixes a possible invalid write, found by Nicolas George.

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

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

This will allow making AVFilterPad opaque for the calling apps, since
those are the only two fields that can be useful to the users.

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

avcodec.c is where it is defined the lavc/lavfi interface code, so seems
a more adequate location (and doesn't force the inclusion of
libavcodec/avcodec.h where it is not required).

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

Return a const char *, fix warnings:
libavfilter/avfilter.c: In function ‘default_filter_name’:
libavfilter/avfilter.c:414:5: warning: return discards ‘const’ qualifier from pointer target type [enabled by default]
libavfilter/avfilter.c: At top level:
libavfilter/avfilter.c:419:5: warning: initialization from incompatible pointer type [enabled by default]
libavfilter/avfilter.c:419:5: warning: (near initialization for ‘avfilter_class.item_name’) [enabled by default]

Fix build after b74a1da4.

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

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>

The current flat arguments syntax is not easily extensible
due to sws_param possibly containing commas.
This is also consistent with abuffersrc.

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

With that change, there is only one array for the inputs,
it will make easier to implement a variable number of inputs.

Fixes sporadic segfaults with some filters.

The function was introduced in 4d6a8a2bdb and is not used anymore
outside avfilter.c.

This avoids to pollute the public API with an apparently unnecessary
function. The function was introduced a few days ago, so removing it from
the public API should do no much harm.

Include missing required internal headers.

They were discarded in 0f0f3bd1e0.

The new location is more suited, as it is where the lavfi/lavc glue is
defined.

I changed the *_set_common_* functions to only set unset formats, then
added a wrapper that calls them after the filters query_formats.

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

This is a temporary workaround for amerge,
until format renegociation is implemented.

Should fix trac ticket #1400.

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.

It is only useful inside filters and we don't allow user filters for
now.

This is the deprecated version of the function but it is exported, so it
should fix the shared FATE box.

Based on the shotdetect algorithm (http://shotdetect.nonutc.fr/ by Johan
MATHE johan.mathe tremplin-utc.net).

They are not used outside of avfiltergraph.c

avfilter_default_filter_name() is supposed to access an AVFilterContext
struct, if used with a private struct it will cause a crash since it will
access fields which are non defined in the private struct.

The function is modelled after av_default_item_name(), and will print the
name of the instance filter if defined, otherwise the name of the filter.

This allows to show the instance name in the log, which is useful when
debugging complex filter graphs.

Please help setting the category for all remaining AVClasses

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

The old implementation, upon receiving a frame on the main
input, would request an overlay frame if necessary. This could
generate an infinite recursion, off-by-one frame mismatch and
other harmful effects, especially it the split filter is present
upgraph.

The new implementation uses the linear approach: it uses two
buffer queues for frames received out of turn and forwards
request_frame calls to the input where a frame is necessary.