lavfi: port MP noise filter

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

Changelog

@@ -18,6 +18,7 @@ version <next>:
 - il filter ported from libmpcodecs
 - support ID3v2 tags in ASF files
 - RF64 support in WAV muxer
+- noise filter ported from libmpcodecs
 
 
 version 1.1:

LICENSE

@@ -36,6 +36,7 @@ Specifically, the GPL parts of FFmpeg are
     - vf_hue.c
     - vf_kerndeint.c
     - vf_mp.c
+    - vf_noise.c
     - vf_pp.c
     - vf_smartblur.c
     - vf_super2xsai.c

configure

@@ -2012,6 +2012,7 @@ movie_filter_deps="avcodec avformat"
 mp_filter_deps="gpl avcodec swscale inline_asm"
 mptestsrc_filter_deps="gpl"
 negate_filter_deps="lut_filter"
+noise_filter_deps="gpl"
 resample_filter_deps="avresample"
 ocv_filter_deps="libopencv"
 pan_filter_deps="swresample"

doc/filters.texi

@@ -3630,7 +3630,6 @@ The list of the currently supported filters follows:
 @item ivtc
 @item kerndeint
 @item mcdeint
-@item noise
 @item ow
 @item perspective
 @item phase
@@ -3657,12 +3656,6 @@ Adjust gamma, brightness, contrast:
 @example
 mp=eq2=1.0:2:0.5
 @end example
-
-@item
-Add temporal noise to input video:
-@example
-mp=noise=20t
-@end example
 @end itemize
 
 See also mplayer(1), @url{http://www.mplayerhq.hu/}.
@@ -3692,6 +3685,57 @@ noformat=yuv420p,vflip
 noformat=yuv420p:yuv444p:yuv410p
 @end example
 
+@section noise
+
+Add noise on video input frame.
+
+This filter accepts a list of options in the form of @var{key}=@var{value}
+pairs separated by ":". A description of the accepted options follows.
+
+@table @option
+@item all_seed
+@item c0_seed
+@item c1_seed
+@item c2_seed
+@item c3_seed
+Set noise seed for specific pixel component or all pixel components in case
+of @var{all_seed}. Default value is @code{123457}.
+
+@item all_strength, as
+@item c0_strength, c0s
+@item c1_strength, c1s
+@item c2_strength, c2s
+@item c3_strength, c3s
+Set noise strength for specific pixel component or all pixel components in case
+@var{all_strength}. Default value is @code{0}. Allowed range is [0, 100].
+
+@item all_flags, af
+@item c0_flags, c0f
+@item c1_flags, c1f
+@item c2_flags, c2f
+@item c3_flags, c3f
+Set pixel component flags or set flags for all components if @var{all_flags}.
+Available values for component flags are:
+@table @samp
+@item a
+averaged temporal noise (smoother)
+@item p
+mix random noise with a (semi)regular pattern
+@item q
+higher quality (slightly better looking, slightly slower)
+@item t
+temporal noise (noise pattern changes between frames)
+@item u
+uniform noise (gaussian otherwise)
+@end table
+@end table
+
+Some examples follow:
+@example
+Add temporal and uniform noise to input video:
+noise=alls=20:allf=t+u
+@end example
+
 @section null
 
 Pass the video source unchanged to the output.

libavfilter/Makefile

@@ -134,6 +134,7 @@ OBJS-$(CONFIG_LUTYUV_FILTER)                 += vf_lut.o
 OBJS-$(CONFIG_MP_FILTER)                     += vf_mp.o
 OBJS-$(CONFIG_NEGATE_FILTER)                 += vf_lut.o
 OBJS-$(CONFIG_NOFORMAT_FILTER)               += vf_format.o
+OBJS-$(CONFIG_NOISE_FILTER)                  += vf_noise.o
 OBJS-$(CONFIG_NULL_FILTER)                   += vf_null.o
 OBJS-$(CONFIG_OCV_FILTER)                    += vf_libopencv.o
 OBJS-$(CONFIG_OVERLAY_FILTER)                += vf_overlay.o

libavfilter/allfilters.c

@@ -128,6 +128,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(MP,             mp,             vf);
     REGISTER_FILTER(NEGATE,         negate,         vf);
     REGISTER_FILTER(NOFORMAT,       noformat,       vf);
+    REGISTER_FILTER(NOISE,          noise,          vf);
     REGISTER_FILTER(NULL,           null,           vf);
     REGISTER_FILTER(OCV,            ocv,            vf);
     REGISTER_FILTER(OVERLAY,        overlay,        vf);

libavfilter/version.h

@@ -29,8 +29,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  37
-#define LIBAVFILTER_VERSION_MICRO 103
+#define LIBAVFILTER_VERSION_MINOR  38
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \