Mostly based on libavcodec's

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

Building libavfilter without that functionality makes little sense.

vf_scale should not be unconditionally compiled even if disabled.

Based on the volume filter in FFmpeg written by Stefano Sabatini
<stefasab@gmail.com>.

The following commit will make it useless.

The crop_scale_vflip FATE test changes because of off-by-one differences
in output when vflipped slices are passed to sws.

It can be useful for debugging.

Based on a patch by Stefano Sabatini <stefano.sabatini-lala@poste.it>

This tool uses lavfi internal symbols not accessible in shared
libraries.  TESTPROGS are linked statically to allow them use of
library internals not normally exported.

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

Inspired by MPlayer's af_channels filter and SoX's remix effect.

It joins multiple input streams into one multi-channel output.

It will be used for audio too.

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: Anton 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.

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.

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

It can be used to directly pass a AVFilterBufferRef to lavfi, avoiding a
memcpy.

It's a part of public API.

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

It declares API necessary for filtering apps.

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

The licence was changed from GPL to LGPL with explicit approval from
the original author.

See thread:
Subject: [FFmpeg-devel] [PATCH] lavfi: add rgbtestsrc source,
        ported from MPlayer libmpcodecs
Date: Mon, 11 Jul 2011 16:32:41 +0200

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

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

The ported filter supports named option parsing and more YUV formats.

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

With the following additions:
* support to gray format
* support to yuva420p format
* parametric luma/chroma/alpha radius
* consistency check on the radius values, avoid crashes with invalid values

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

This filter is a simple wrapper around the LUT filter.

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

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

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

Some fixes by Stefano.
For detailed authorship see SOC repo

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

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

Declaring tools associated with each library in their respective
makefiles allows these tools to easily depend on the correct
prerequisites and link against the libs they need.

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