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

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

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

Link properties have to be checked after config_props() is called to
make sure everything is sane, so the default config_props() for output
links was redundant.

Remove now empty defaults.c
Signed-off-by: NAnton Khirnov <anton@khirnov.net>

Based on current version of the asplit filter in FFmpeg written by
Stefano Sabatini and others.

This is in preparation for adding an audio split filter.

The file now contains both an audio and a video split filter.

The move allows to share the init code already used by split.

Most of the code is moved to buffersrc.c
to help Git see the similarities.

src_buffer.c still contains the obsolete compatibility functions.

The format change detection code was removed as it has been
implemented directly in ffmpeg.
It can easily be brought back from the history.

Partially based on a patch by Robert Nagy <ronag89@gmail.com>

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

Based on a patch by Mina Nagy Zaki <mnzaki@gmail.com>

Most of the code will be shared for both audio and video version.

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

Also add the public interface libavfilter/buffersink.h.

Based on a commit by Stefano Sabatini.

The scale filter is used for internal colorspace conversions, so it must
always be present.

The filter is useless.
Signed-off-by: NPaul B Mahol <onemda@gmail.com>
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

The native libavfilter hflip filter does the same thing.

It was ported to a native libavfilter filter.

Partially based on the port by Niel van der Westhuizen
<nielkie@gmail.com>, done for GCI 2010. Same output as the original
filter and as fast.

See thread:
Subject: [FFmpeg-devel] [PATCH] Port MPlayer 2xSaI filter to libavfilter
Date: Thu, 25 Nov 2010 01:31:24 +1000

The header is part of the public API, in particular is used by
doc/examples/filtering_audio.c.

removelogo has been ported to libavfilter, and the wrapper was not
working.

The code is based on the remove-logo filter in MPlayer/libmpcodecs, by
Robert Edele, relicensed to LGPL with consent of the author.

Address trac issue #249.

Ported by: Baptiste Coudurier
cleanup+fate by ubitux
For detailed authorship of the original code please see avisynth

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

This allows simplifying the Makefiles; it is no longer necessary to register
arch subdirectory Makefiles, just putting them in place is enough.

This new API stores useful data in a dedicated structure
and has clearly delimited init functions.

Hopefully, uses of the old API can be replaced quickly.

Also add bbox.h and bbox.c files, based on the remove-logo filter by
Robert Edele. These files are useful for sharing code with the pending
removelogo port.

The filter has been ported to a native libavfilter filter.