Add tonemap filter
Based off mpv automatic tonemapping capabilities. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
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doc/filters.texi
108
doc/filters.texi
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@ -14442,6 +14442,113 @@ Vertical low-pass filtering can only be enabled for @option{mode}
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@end table
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@section tonemap
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Tone map colors from different dynamic ranges.
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This filter expects data in single precision floating point, as it needs to
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operate on (and can output) out-of-range values. Another filter, such as
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@ref{zscale}, is needed to convert the resulting frame to a usable format.
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The tonemapping algorithms implemented only work on linear light, so input
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data should be linearized beforehand (and possibly correctly tagged).
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@example
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ffmpeg -i INPUT -vf zscale=transfer=linear,tonemap=clip,zscale=transfer=bt709,format=yuv420p OUTPUT
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@end example
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@subsection Options
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The filter accepts the following options.
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@table @option
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@item tonemap
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Set the tone map algorithm to use.
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Possible values are:
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@table @var
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@item none
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Do not apply any tone map, only desaturate overbright pixels.
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@item clip
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Hard-clip any out-of-range values. Use it for perfect color accuracy for
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in-range values, while distorting out-of-range values.
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@item linear
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Stretch the entire reference gamut to a linear multiple of the display.
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@item gamma
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Fit a logarithmic transfer between the tone curves.
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@item reinhard
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Preserve overall image brightness with a simple curve, using nonlinear
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contrast, which results in flattening details and degrading color accuracy.
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@item hable
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Peserve both dark and bright details better than @var{reinhard}, at the cost
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of slightly darkening everything. Use it when detail preservation is more
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important than color and brightness accuracy.
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@item mobius
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Smoothly map out-of-range values, while retaining contrast and colors for
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in-range material as much as possible. Use it when color accuracy is more
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important than detail preservation.
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@end table
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Default is none.
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@item param
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Tune the tone mapping algorithm.
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This affects the following algorithms:
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@table @var
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@item none
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Ignored.
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@item linear
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Specifies the scale factor to use while stretching.
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Default to 1.0.
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@item gamma
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Specifies the exponent of the function.
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Default to 1.8.
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@item clip
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Specify an extra linear coefficient to multiply into the signal before clipping.
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Default to 1.0.
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@item reinhard
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Specify the local contrast coefficient at the display peak.
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Default to 0.5, which means that in-gamut values will be about half as bright
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as when clipping.
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@item hable
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Ignored.
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@item mobius
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Specify the transition point from linear to mobius transform. Every value
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below this point is guaranteed to be mapped 1:1. The higher the value, the
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more accurate the result will be, at the cost of losing bright details.
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Default to 0.3, which due to the steep initial slope still preserves in-range
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colors fairly accurately.
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@end table
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@item desat
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Apply desaturation for highlights that exceed this level of brightness. The
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higher the parameter, the more color information will be preserved. This
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setting helps prevent unnaturally blown-out colors for super-highlights, by
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(smoothly) turning into white instead. This makes images feel more natural,
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at the cost of reducing information about out-of-range colors.
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The default of 2.0 is somewhat conservative and will mostly just apply to
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skies or directly sunlit surfaces. A setting of 0.0 disables this option.
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This option works only if the input frame has a supported color tag.
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@item peak
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Override signal/nominal/reference peak with this value. Useful when the
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embedded peak information in display metadata is not reliable or when tone
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mapping from a lower range to a higher range.
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@end table
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@section transpose
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Transpose rows with columns in the input video and optionally flip it.
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@ -15627,6 +15734,7 @@ zoompan=z='min(max(zoom,pzoom)+0.0015,1.5)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih
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@end example
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@end itemize
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@anchor{zscale}
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@section zscale
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Scale (resize) the input video, using the z.lib library:
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https://github.com/sekrit-twc/zimg.
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@ -314,6 +314,7 @@ OBJS-$(CONFIG_THUMBNAIL_FILTER) += vf_thumbnail.o
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OBJS-$(CONFIG_TILE_FILTER) += vf_tile.o
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OBJS-$(CONFIG_TINTERLACE_FILTER) += vf_tinterlace.o
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OBJS-$(CONFIG_TLUT2_FILTER) += vf_lut2.o framesync2.o
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OBJS-$(CONFIG_TONEMAP_FILTER) += vf_tonemap.o
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OBJS-$(CONFIG_TRANSPOSE_FILTER) += vf_transpose.o
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OBJS-$(CONFIG_TRIM_FILTER) += trim.o
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OBJS-$(CONFIG_UNPREMULTIPLY_FILTER) += vf_premultiply.o framesync2.o
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@ -325,6 +325,7 @@ static void register_all(void)
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REGISTER_FILTER(TILE, tile, vf);
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REGISTER_FILTER(TINTERLACE, tinterlace, vf);
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REGISTER_FILTER(TLUT2, tlut2, vf);
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REGISTER_FILTER(TONEMAP, tonemap, vf);
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REGISTER_FILTER(TRANSPOSE, transpose, vf);
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REGISTER_FILTER(TRIM, trim, vf);
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REGISTER_FILTER(UNPREMULTIPLY, unpremultiply, vf);
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@ -30,7 +30,7 @@
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#include "libavutil/version.h"
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#define LIBAVFILTER_VERSION_MAJOR 6
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#define LIBAVFILTER_VERSION_MINOR 98
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#define LIBAVFILTER_VERSION_MINOR 99
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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@ -0,0 +1,354 @@
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/*
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* Copyright (c) 2017 Vittorio Giovara <vittorio.giovara@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* tonemap algorithms
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*/
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#include <float.h>
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#include <stdio.h>
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#include <string.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mastering_display_metadata.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#define REFERENCE_WHITE 100.0f
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enum TonemapAlgorithm {
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TONEMAP_NONE,
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TONEMAP_LINEAR,
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TONEMAP_GAMMA,
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TONEMAP_CLIP,
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TONEMAP_REINHARD,
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TONEMAP_HABLE,
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TONEMAP_MOBIUS,
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TONEMAP_MAX,
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};
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typedef struct LumaCoefficients {
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double cr, cg, cb;
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} LumaCoefficients;
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static const struct LumaCoefficients luma_coefficients[AVCOL_SPC_NB] = {
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[AVCOL_SPC_FCC] = { 0.30, 0.59, 0.11 },
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[AVCOL_SPC_BT470BG] = { 0.299, 0.587, 0.114 },
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[AVCOL_SPC_SMPTE170M] = { 0.299, 0.587, 0.114 },
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[AVCOL_SPC_BT709] = { 0.2126, 0.7152, 0.0722 },
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[AVCOL_SPC_SMPTE240M] = { 0.212, 0.701, 0.087 },
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[AVCOL_SPC_BT2020_NCL] = { 0.2627, 0.6780, 0.0593 },
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[AVCOL_SPC_BT2020_CL] = { 0.2627, 0.6780, 0.0593 },
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};
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typedef struct TonemapContext {
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const AVClass *class;
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enum TonemapAlgorithm tonemap;
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double param;
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double desat;
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double peak;
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const LumaCoefficients *coeffs;
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} TonemapContext;
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_GBRPF32,
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AV_PIX_FMT_GBRAPF32,
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AV_PIX_FMT_NONE,
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};
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static int query_formats(AVFilterContext *ctx)
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{
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return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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TonemapContext *s = ctx->priv;
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switch(s->tonemap) {
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case TONEMAP_GAMMA:
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if (isnan(s->param))
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s->param = 1.8f;
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break;
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case TONEMAP_REINHARD:
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if (!isnan(s->param))
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s->param = (1.0f - s->param) / s->param;
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break;
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case TONEMAP_MOBIUS:
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if (isnan(s->param))
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s->param = 0.3f;
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break;
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}
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if (isnan(s->param))
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s->param = 1.0f;
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return 0;
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}
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static double determine_signal_peak(AVFrame *in)
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{
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AVFrameSideData *sd = av_frame_get_side_data(in, AV_FRAME_DATA_CONTENT_LIGHT_LEVEL);
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double peak = 0;
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if (sd) {
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AVContentLightMetadata *clm = (AVContentLightMetadata *)sd->data;
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peak = clm->MaxCLL / REFERENCE_WHITE;
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}
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sd = av_frame_get_side_data(in, AV_FRAME_DATA_MASTERING_DISPLAY_METADATA);
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if (!peak && sd) {
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AVMasteringDisplayMetadata *metadata = (AVMasteringDisplayMetadata *)sd->data;
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if (metadata->has_luminance)
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peak = av_q2d(metadata->max_luminance) / REFERENCE_WHITE;
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}
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/* smpte2084 needs the side data above to work correctly
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* if missing, assume that the original transfer was arib-std-b67 */
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if (!peak)
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peak = 12;
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return peak;
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}
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static float hable(float in)
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{
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float a = 0.15f, b = 0.50f, c = 0.10f, d = 0.20f, e = 0.02f, f = 0.30f;
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return (in * (in * a + b * c) + d * e) / (in * (in * a + b) + d * f) - e / f;
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}
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static float mobius(float in, float j, double peak)
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{
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float a, b;
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if (in <= j)
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return in;
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a = -j * j * (peak - 1.0f) / (j * j - 2.0f * j + peak);
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b = (j * j - 2.0f * j * peak + peak) / FFMAX(peak - 1.0f, 1e-6);
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return (b * b + 2.0f * b * j + j * j) / (b - a) * (in + a) / (in + b);
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}
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#define MIX(x,y,a) (x) * (1 - (a)) + (y) * (a)
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static void tonemap(TonemapContext *s, AVFrame *out, const AVFrame *in,
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const AVPixFmtDescriptor *desc, int x, int y, double peak)
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{
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const float *r_in = (const float *)(in->data[0] + x * desc->comp[0].step + y * in->linesize[0]);
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const float *b_in = (const float *)(in->data[1] + x * desc->comp[1].step + y * in->linesize[1]);
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const float *g_in = (const float *)(in->data[2] + x * desc->comp[2].step + y * in->linesize[2]);
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float *r_out = (float *)(out->data[0] + x * desc->comp[0].step + y * out->linesize[0]);
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float *b_out = (float *)(out->data[1] + x * desc->comp[1].step + y * out->linesize[1]);
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float *g_out = (float *)(out->data[2] + x * desc->comp[2].step + y * out->linesize[2]);
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float sig, sig_orig;
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/* load values */
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*r_out = *r_in;
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*b_out = *b_in;
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*g_out = *g_in;
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/* desaturate to prevent unnatural colors */
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if (s->desat > 0) {
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float luma = s->coeffs->cr * *r_in + s->coeffs->cg * *g_in + s->coeffs->cb * *b_in;
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float overbright = FFMAX(luma - s->desat, 1e-6) / FFMAX(luma, 1e-6);
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*r_out = MIX(*r_in, luma, overbright);
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*g_out = MIX(*g_in, luma, overbright);
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*b_out = MIX(*b_in, luma, overbright);
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}
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/* pick the brightest component, reducing the value range as necessary
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* to keep the entire signal in range and preventing discoloration due to
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* out-of-bounds clipping */
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sig = FFMAX(FFMAX3(*r_out, *g_out, *b_out), 1e-6);
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sig_orig = sig;
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switch(s->tonemap) {
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default:
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case TONEMAP_NONE:
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// do nothing
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break;
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case TONEMAP_LINEAR:
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sig = sig * s->param / peak;
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break;
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case TONEMAP_GAMMA:
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sig = sig > 0.05f ? pow(sig / peak, 1.0f / s->param)
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: sig * pow(0.05f / peak, 1.0f / s->param) / 0.05f;
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break;
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case TONEMAP_CLIP:
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sig = av_clipf(sig * s->param, 0, 1.0f);
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break;
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case TONEMAP_HABLE:
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sig = hable(sig) / hable(peak);
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break;
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case TONEMAP_REINHARD:
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sig = sig / (sig + s->param) * (peak + s->param) / peak;
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break;
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case TONEMAP_MOBIUS:
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sig = mobius(sig, s->param, peak);
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break;
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}
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/* apply the computed scale factor to the color,
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* linearly to prevent discoloration */
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*r_out *= sig / sig_orig;
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*g_out *= sig / sig_orig;
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*b_out *= sig / sig_orig;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *in)
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{
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TonemapContext *s = link->dst->priv;
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AVFilterLink *outlink = link->dst->outputs[0];
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AVFrame *out;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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const AVPixFmtDescriptor *odesc = av_pix_fmt_desc_get(outlink->format);
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int ret, x, y;
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double peak = s->peak;
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if (!desc || !odesc) {
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av_frame_free(&in);
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return AVERROR_BUG;
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}
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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ret = av_frame_copy_props(out, in);
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if (ret < 0) {
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av_frame_free(&in);
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av_frame_free(&out);
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return ret;
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}
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/* input and output transfer will be linear */
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if (in->color_trc == AVCOL_TRC_UNSPECIFIED) {
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av_log(s, AV_LOG_WARNING, "Untagged transfer, assuming linear light\n");
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out->color_trc = AVCOL_TRC_LINEAR;
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} else if (in->color_trc != AVCOL_TRC_LINEAR)
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av_log(s, AV_LOG_WARNING, "Tonemapping works on linear light only\n");
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/* read peak from side data if not passed in */
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if (!peak) {
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peak = determine_signal_peak(in);
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av_log(s, AV_LOG_DEBUG, "Computed signal peak: %f\n", peak);
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}
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/* load original color space even if pixel format is RGB to compute overbrights */
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s->coeffs = &luma_coefficients[in->colorspace];
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if (s->desat > 0 && (in->colorspace == AVCOL_SPC_UNSPECIFIED || !s->coeffs)) {
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if (in->colorspace == AVCOL_SPC_UNSPECIFIED)
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av_log(s, AV_LOG_WARNING, "Missing color space information, ");
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else if (!s->coeffs)
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av_log(s, AV_LOG_WARNING, "Unsupported color space '%s', ",
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av_color_space_name(in->colorspace));
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av_log(s, AV_LOG_WARNING, "desaturation is disabled\n");
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s->desat = 0;
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}
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/* do the tone map */
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for (y = 0; y < out->height; y++)
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for (x = 0; x < out->width; x++)
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tonemap(s, out, in, desc, x, y, peak);
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/* copy/generate alpha if needed */
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if (desc->flags & AV_PIX_FMT_FLAG_ALPHA && odesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
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av_image_copy_plane(out->data[3], out->linesize[3],
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in->data[3], in->linesize[3],
|
||||
out->linesize[3], outlink->h);
|
||||
} else if (odesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
|
||||
for (y = 0; y < out->height; y++) {
|
||||
for (x = 0; x < out->width; x++) {
|
||||
AV_WN32(out->data[3] + x * odesc->comp[3].step + y * out->linesize[3],
|
||||
av_float2int(1.0f));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
av_frame_free(&in);
|
||||
|
||||
return ff_filter_frame(outlink, out);
|
||||
}
|
||||
|
||||
#define OFFSET(x) offsetof(TonemapContext, x)
|
||||
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
|
||||
static const AVOption tonemap_options[] = {
|
||||
{ "tonemap", "tonemap algorithm selection", OFFSET(tonemap), AV_OPT_TYPE_INT, {.i64 = TONEMAP_NONE}, TONEMAP_NONE, TONEMAP_MAX - 1, FLAGS, "tonemap" },
|
||||
{ "none", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_NONE}, 0, 0, FLAGS, "tonemap" },
|
||||
{ "linear", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_LINEAR}, 0, 0, FLAGS, "tonemap" },
|
||||
{ "gamma", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_GAMMA}, 0, 0, FLAGS, "tonemap" },
|
||||
{ "clip", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_CLIP}, 0, 0, FLAGS, "tonemap" },
|
||||
{ "reinhard", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_REINHARD}, 0, 0, FLAGS, "tonemap" },
|
||||
{ "hable", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_HABLE}, 0, 0, FLAGS, "tonemap" },
|
||||
{ "mobius", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_MOBIUS}, 0, 0, FLAGS, "tonemap" },
|
||||
{ "param", "tonemap parameter", OFFSET(param), AV_OPT_TYPE_DOUBLE, {.dbl = NAN}, DBL_MIN, DBL_MAX, FLAGS },
|
||||
{ "desat", "desaturation strength", OFFSET(desat), AV_OPT_TYPE_DOUBLE, {.dbl = 2}, 0, DBL_MAX, FLAGS },
|
||||
{ "peak", "signal peak override", OFFSET(peak), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, DBL_MAX, FLAGS },
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
static const AVClass tonemap_class = {
|
||||
.class_name = "tonemap",
|
||||
.item_name = av_default_item_name,
|
||||
.option = tonemap_options,
|
||||
.version = LIBAVUTIL_VERSION_INT,
|
||||
.category = AV_CLASS_CATEGORY_FILTER,
|
||||
};
|
||||
|
||||
static const AVFilterPad tonemap_inputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.filter_frame = filter_frame,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
static const AVFilterPad tonemap_outputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
AVFilter ff_vf_tonemap = {
|
||||
.name = "tonemap",
|
||||
.description = NULL_IF_CONFIG_SMALL("Conversion to/from different dynamic ranges."),
|
||||
.init = init,
|
||||
.query_formats = query_formats,
|
||||
.priv_size = sizeof(TonemapContext),
|
||||
.priv_class = &tonemap_class,
|
||||
.inputs = tonemap_inputs,
|
||||
.outputs = tonemap_outputs,
|
||||
};
|
||||
Loading…
Reference in New Issue