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https://github.com/FFmpeg/FFmpeg.git
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colorbalance filter
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
parent
3e9c0217fd
commit
449cdd547b
@ -23,6 +23,7 @@ version <next>:
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- new interlace filter
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- smptehdbars source
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- inverse telecine filters (fieldmatch and decimate)
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- colorbalance filter
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version 1.2:
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@ -2051,6 +2051,46 @@ boxblur=luma_radius=min(h\,w)/10:luma_power=1:chroma_radius=min(cw\,ch)/10:chrom
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@end example
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@end itemize
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@section colorbalance
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Modify intensity of primary colors (red, green and blue) of input frames.
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The filter allows an input frame to be adjusted in the shadows, midtones or highlights
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regions for the red-cyan, green-magenta or blue-yellow balance.
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A positive adjustment value shifts the balance towards the primary color, a negative
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value towards the complementary color.
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The filter accepts the following options:
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@table @option
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@item rs
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@item gs
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@item bs
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Adjust red, green and blue shadows (darkest pixels).
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@item rm
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@item gm
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@item bm
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Adjust red, green and blue midtones (medium pixels).
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@item rh
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@item gh
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@item bh
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Adjust red, green and blue highlights (brightest pixels).
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Allowed ranges for options are @code{[-1.0, 1.0]}. Defaults are @code{0}.
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@end table
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@subsection Examples
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@itemize
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@item
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Add red color cast to shadows:
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@example
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colorbalance=rs=.3
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@end example
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@end itemize
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@section colormatrix
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Convert color matrix.
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@ -104,6 +104,7 @@ OBJS-$(CONFIG_BLACKDETECT_FILTER) += vf_blackdetect.o
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OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
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OBJS-$(CONFIG_BLEND_FILTER) += vf_blend.o
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OBJS-$(CONFIG_BOXBLUR_FILTER) += vf_boxblur.o
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OBJS-$(CONFIG_COLORBALANCE_FILTER) += vf_colorbalance.o
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OBJS-$(CONFIG_COLORMATRIX_FILTER) += vf_colormatrix.o
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OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
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OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
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@ -102,6 +102,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER(BLACKFRAME, blackframe, vf);
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REGISTER_FILTER(BLEND, blend, vf);
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REGISTER_FILTER(BOXBLUR, boxblur, vf);
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REGISTER_FILTER(COLORBALANCE, colorbalance, vf);
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REGISTER_FILTER(COLORMATRIX, colormatrix, vf);
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REGISTER_FILTER(COPY, copy, vf);
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REGISTER_FILTER(CROP, crop, vf);
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@ -29,8 +29,8 @@
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR 3
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#define LIBAVFILTER_VERSION_MINOR 56
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#define LIBAVFILTER_VERSION_MICRO 103
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#define LIBAVFILTER_VERSION_MINOR 57
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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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LIBAVFILTER_VERSION_MINOR, \
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212
libavfilter/vf_colorbalance.c
Normal file
212
libavfilter/vf_colorbalance.c
Normal file
@ -0,0 +1,212 @@
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/*
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* Copyright (c) 2013 Paul B Mahol
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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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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "drawutils.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 R 0
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#define G 1
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#define B 2
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#define A 3
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typedef struct {
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double shadows;
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double midtones;
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double highlights;
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} Range;
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typedef struct {
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const AVClass *class;
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Range cyan_red;
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Range magenta_green;
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Range yellow_blue;
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uint8_t lut[3][256];
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uint8_t rgba_map[4];
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int step;
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} ColorBalanceContext;
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#define OFFSET(x) offsetof(ColorBalanceContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption colorbalance_options[] = {
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{ "rs", "set red shadows", OFFSET(cyan_red.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ "gs", "set green shadows", OFFSET(magenta_green.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ "bs", "set blue shadows", OFFSET(yellow_blue.shadows), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ "rm", "set red midtones", OFFSET(cyan_red.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ "gm", "set green midtones", OFFSET(magenta_green.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ "bm", "set blue midtones", OFFSET(yellow_blue.midtones), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ "rh", "set red highlights", OFFSET(cyan_red.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ "gh", "set green highlights", OFFSET(magenta_green.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ "bh", "set blue highlights", OFFSET(yellow_blue.highlights), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -1, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(colorbalance);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
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AV_PIX_FMT_ABGR, AV_PIX_FMT_ARGB,
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AV_PIX_FMT_0BGR, AV_PIX_FMT_0RGB,
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AV_PIX_FMT_RGB0, AV_PIX_FMT_BGR0,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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ColorBalanceContext *cb = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
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double *shadows, *midtones, *highlights, *buffer;
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int i, r, g, b;
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buffer = av_malloc(256 * 3 * sizeof(*buffer));
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if (!buffer)
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return AVERROR(ENOMEM);
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shadows = buffer + 256 * 0;
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midtones = buffer + 256 * 1;
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highlights = buffer + 256 * 2;
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for (i = 0; i < 256; i++) {
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double low = av_clipd((i - 85.0) / -64.0 + 0.5, 0, 1) * 178.5;
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double mid = av_clipd((i - 85.0) / 64.0 + 0.5, 0, 1) *
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av_clipd((i + 85.0 - 255.0) / -64.0 + 0.5, 0, 1) * 178.5;
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shadows[i] = low;
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midtones[i] = mid;
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highlights[255 - i] = low;
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}
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for (i = 0; i < 256; i++) {
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r = g = b = i;
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r = av_clip_uint8(r + cb->cyan_red.shadows * shadows[r]);
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r = av_clip_uint8(r + cb->cyan_red.midtones * midtones[r]);
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r = av_clip_uint8(r + cb->cyan_red.highlights * highlights[r]);
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g = av_clip_uint8(g + cb->magenta_green.shadows * shadows[g]);
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g = av_clip_uint8(g + cb->magenta_green.midtones * midtones[g]);
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g = av_clip_uint8(g + cb->magenta_green.highlights * highlights[g]);
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b = av_clip_uint8(b + cb->yellow_blue.shadows * shadows[b]);
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b = av_clip_uint8(b + cb->yellow_blue.midtones * midtones[b]);
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b = av_clip_uint8(b + cb->yellow_blue.highlights * highlights[b]);
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cb->lut[R][i] = r;
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cb->lut[G][i] = g;
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cb->lut[B][i] = b;
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}
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av_free(buffer);
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ff_fill_rgba_map(cb->rgba_map, outlink->format);
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cb->step = av_get_padded_bits_per_pixel(desc) >> 3;
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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ColorBalanceContext *cb = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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const uint8_t roffset = cb->rgba_map[R];
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const uint8_t goffset = cb->rgba_map[G];
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const uint8_t boffset = cb->rgba_map[B];
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const uint8_t aoffset = cb->rgba_map[A];
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const int step = cb->step;
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const uint8_t *srcrow = in->data[0];
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uint8_t *dstrow;
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AVFrame *out;
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int i, j;
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if (av_frame_is_writable(in)) {
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out = in;
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} else {
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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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av_frame_copy_props(out, in);
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}
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dstrow = out->data[0];
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for (i = 0; i < outlink->h; i++) {
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const uint8_t *src = srcrow;
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uint8_t *dst = dstrow;
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for (j = 0; j < outlink->w * step; j += step) {
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dst[j + roffset] = cb->lut[R][src[j + roffset]];
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dst[j + goffset] = cb->lut[G][src[j + goffset]];
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dst[j + boffset] = cb->lut[B][src[j + boffset]];
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if (in != out && step == 4)
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dst[j + aoffset] = src[j + aoffset];
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}
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srcrow += in->linesize[0];
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dstrow += out->linesize[0];
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}
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if (in != out)
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av_frame_free(&in);
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return ff_filter_frame(ctx->outputs[0], out);
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}
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static const AVFilterPad colorbalance_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad colorbalance_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_colorbalance = {
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.name = "colorbalance",
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.description = NULL_IF_CONFIG_SMALL("Adjust the color balance."),
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.priv_size = sizeof(ColorBalanceContext),
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.priv_class = &colorbalance_class,
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.query_formats = query_formats,
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.inputs = colorbalance_inputs,
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.outputs = colorbalance_outputs,
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};
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