Fixes Ticket1271

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

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

The input samples buffer must be unreferenced after it is propagated to
the output links.

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

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

Reduce audio fragment alignment jitter by penalizing alignment
correction offsets that deviate too much from the target offset.
This is accomplished by multiplying the cross correlation search
window with a quadratic function.

Signed-off-by: Pavel Koshevoy <pavel@homestead.aragog.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

The code in avfilter_copy_buf_props() is more generic, allow code
factorization.

Use av_frame_* accessors for the newly added fields in AVFrame (for which
we are supposed to use such accessors), and group the istructions
accordingly.

While here:
    - add missing .version and .category,
    - make .class_name consistent across filters,
    - align declarations.

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

Add atempo audio filter for adjusting audio tempo without affecting
pitch. This filter implements WSOLA algorithm with fast cross
correlation calculation in frequency domain.

Signed-off-by: Pavel Koshevoy <pavel@homestead.aragog.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

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

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

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

This filter changes the number of samples on single output operation.

Based on a patch by Andrey Utkin <andrey.krieger.utkin@gmail.com>.

The filter now supports a configurable number of outputs.

Remove duplicated out-of-loop init code, and do color matrix
initialization at the beginning of each y iteration.

Allow factorization and avoid an useless matrix update in the last
iteration.

The previous table appears to be wrong (it was copied from the original
MPlayer super2xsai filter in order to keep binary compatibility).

The new table is consistent with the init code and apparently fixes a
combing artifact on the left edge of the generated image.

Use the same values of the video output link.

Avoid the need to override the default_start_frame() with an ad-hoc
start_frame() callback.

In particular, fix the super2xsai filter which was setting the
input w/h values in the output.

The function will abort through an assert if the source is not defined,
or if the internal state of the source is inconsistent (e.g. type = AUDIO
&& !src->audio).

Add a NULL to prevent undefined behavior

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

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>