---
This is an attempt to reproduce the exact same behaviour as the
selective color tool in photoshop (and maybe other adobe tool). Since
I didn't find time to write the documentation yet, the filter can be
summarized with something like: it allows you to adjust cyan, magenta,
yellow on only a certain ranges of colors (reds, yellows, darks, ...).
The adjustment range is defined by the "purity" of the color (that is,
how saturated it already is).
It's still incomplete (see @todo in the header and XXX in the code). If
anyone is feeling like helping in the reverse of the filter, it's very
welcome.
---
doc/filters.texi | 4 +
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_selectivecolor.c | 373 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 379 insertions(+)
create mode 100644 libavfilter/vf_selectivecolor.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 1bef836..747f573 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -11917,6 +11917,10 @@ select=n=2:e='mod(n, 2)+1' [odd][even]; [odd]
pad=h=2*ih [tmp]; [tmp][even] over
@end example
@end itemize
+@section selectivecolor
+
+TODO
+
@section sendcmd, asendcmd
Send commands to filters in the filtergraph.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index a259851..4aebf4e 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -191,6 +191,7 @@ OBJS-$(CONFIG_SEPARATEFIELDS_FILTER) +=
vf_separatefields.o
OBJS-$(CONFIG_SAB_FILTER) += vf_sab.o
OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
OBJS-$(CONFIG_SELECT_FILTER) += f_select.o
+OBJS-$(CONFIG_SELECTIVECOLOR_FILTER) += vf_selectivecolor.o
OBJS-$(CONFIG_SENDCMD_FILTER) += f_sendcmd.o
OBJS-$(CONFIG_SETDAR_FILTER) += vf_aspect.o
OBJS-$(CONFIG_SETFIELD_FILTER) += vf_setfield.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 01c9e38..e1e5162 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -205,6 +205,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(SAB, sab, vf);
REGISTER_FILTER(SCALE, scale, vf);
REGISTER_FILTER(SELECT, select, vf);
+ REGISTER_FILTER(SELECTIVECOLOR, selectivecolor, vf);
REGISTER_FILTER(SENDCMD, sendcmd, vf);
REGISTER_FILTER(SEPARATEFIELDS, separatefields, vf);
REGISTER_FILTER(SETDAR, setdar, vf);
diff --git a/libavfilter/vf_selectivecolor.c b/libavfilter/vf_selectivecolor.c
new file mode 100644
index 0000000..a93de27
--- /dev/null
+++ b/libavfilter/vf_selectivecolor.c
@@ -0,0 +1,373 @@
+/*
+ * Copyright (c) 2015 Clément Bœsch <u pkh me>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @todo
+ *
+ * - make sure code works properly (likely bugs everywhere)
+ * - use integers
+ * - fate test
+ * - PS param file input
+ * - doc
+ * - eval expressions?
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+enum color_range {
+ RANGE_REDS,
+ RANGE_YELLOWS,
+ RANGE_GREENS,
+ RANGE_CYANS,
+ RANGE_BLUES,
+ RANGE_MAGENTAS,
+ RANGE_WHITES,
+ RANGE_NEUTRALS,
+ RANGE_BLACKS,
+ NB_RANGES
+};
+
+typedef int (*get_adjust_range_func)(int r, int g, int b, int min_val, int
max_val);
+
+struct process_range {
+ int range_id;
+ uint32_t mask;
+ get_adjust_range_func get_adjust_range;
+};
+
+typedef struct ThreadData {
+ AVFrame *in, *out;
+} ThreadData;
+
+typedef struct {
+ const AVClass *class;
+
+ int relative;
+ char *opt_cmyk_adjust[NB_RANGES];
+ float cmyk_adjust[NB_RANGES][4];
+
+ struct process_range process_ranges[NB_RANGES]; // color ranges to process
+ int nb_process_ranges;
+
+} SelectiveColorContext;
+
+#define OFFSET(x) offsetof(SelectiveColorContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+#define RANGE_OPTION(color_name, range) \
+ { color_name"s", "adjust "color_name" regions",
OFFSET(opt_cmyk_adjust[range]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN,
CHAR_MAX, FLAGS }
+
+static const AVOption selectivecolor_options[] = {
+ { "relative", "set for relative adjustments", OFFSET(relative),
AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, FLAGS },
+ RANGE_OPTION("red", RANGE_REDS),
+ RANGE_OPTION("yellow", RANGE_YELLOWS),
+ RANGE_OPTION("green", RANGE_GREENS),
+ RANGE_OPTION("cyan", RANGE_CYANS),
+ RANGE_OPTION("blue", RANGE_BLUES),
+ RANGE_OPTION("magenta", RANGE_MAGENTAS),
+ RANGE_OPTION("white", RANGE_WHITES),
+ RANGE_OPTION("neutral", RANGE_NEUTRALS),
+ RANGE_OPTION("black", RANGE_BLACKS),
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(selectivecolor);
+
+static inline int get_mid_val(int r, int g, int b)
+{
+ if ((r < g && r > b) || (r < b && r > g)) return r;
+ if ((g < r && g > b) || (g < b && g > r)) return g;
+ if ((b < r && b > g) || (b < g && b > r)) return b;
+ return -1;
+}
+
+static int get_rgb_adjust_range(int r, int g, int b, int min_val, int max_val)
+{
+ // max - mid
+ const int mid_val = get_mid_val(r, g, b);
+ if (mid_val == -1) {
+ // XXX: can be simplified
+ if ((r != min_val && g == min_val && b == min_val) ||
+ (r == min_val && g != min_val && b == min_val) ||
+ (r == min_val && g == min_val && b != min_val))
+ return max_val - min_val;
+ return 0;
+ }
+ return max_val - mid_val;
+}
+
+static int get_cmy_adjust_range(int r, int g, int b, int min_val, int max_val)
+{
+ // mid - min
+ const int mid_val = get_mid_val(r, g, b);
+ if (mid_val == -1) {
+ // XXX: refactor with rgb
+ if ((r != max_val && g == max_val && b == max_val) ||
+ (r == max_val && g != max_val && b == max_val) ||
+ (r == max_val && g == max_val && b != max_val))
+ return max_val - min_val;
+ return 0;
+ }
+ return mid_val - min_val;
+}
+
+static int get_neutrals_adjust_range(int r, int g, int b, int min_val, int
max_val)
+{
+ // 1 - (|max-0.5| + |min-0.5|)
+ return (255*2 - (abs((max_val<<1) - 255) + abs((min_val<<1) - 255)) + 1)
>> 1;
+}
+
+static int get_whites_adjust_range(int r, int g, int b, int min_val, int
max_val)
+{
+ // (min - 0.5) * 2
+ return (min_val<<1) - 255;
+}
+
+static int get_blacks_adjust_range(int r, int g, int b, int min_val, int
max_val)
+{
+ // (0.5 - max) * 2
+ return 255 - (max_val<<1);
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ int i;
+ SelectiveColorContext *s = ctx->priv;
+
+ for (i = 0; i < FF_ARRAY_ELEMS(s->opt_cmyk_adjust); i++) {
+ const char *opt_cmyk_adjust = s->opt_cmyk_adjust[i];
+
+ if (opt_cmyk_adjust) {
+ float *cmyk = s->cmyk_adjust[i];
+
+ sscanf(s->opt_cmyk_adjust[i], "%f|%f|%f|%f", cmyk, cmyk+1, cmyk+2,
cmyk+3);
+
+ if (cmyk[0] < -1.0 || cmyk[0] > 1.0 ||
+ cmyk[1] < -1.0 || cmyk[1] > 1.0 ||
+ cmyk[2] < -1.0 || cmyk[2] > 1.0 ||
+ cmyk[3] < -1.0 || cmyk[3] > 1.0) {
+ av_log(s, AV_LOG_ERROR, "CMYK settings must be set in [-1;1]
range\n");
+ return AVERROR(EINVAL);
+ }
+
+ /* If the color range has user settings, register the color range
+ * as "to be processed" */
+ if (cmyk[0] || cmyk[1] || cmyk[2] || cmyk[3]) {
+ struct process_range *pr =
&s->process_ranges[s->nb_process_ranges++];
+
+ pr->range_id = i;
+ pr->mask = 1 << i;
+ if (pr->mask & (1<<RANGE_REDS | 1<<RANGE_GREENS |
1<<RANGE_BLUES)) pr->get_adjust_range = get_rgb_adjust_range;
+ else if (pr->mask & (1<<RANGE_CYANS | 1<<RANGE_MAGENTAS |
1<<RANGE_YELLOWS)) pr->get_adjust_range = get_cmy_adjust_range;
+ else if (pr->mask & 1<<RANGE_WHITES)
pr->get_adjust_range = get_whites_adjust_range;
+ else if (pr->mask & 1<<RANGE_NEUTRALS)
pr->get_adjust_range = get_neutrals_adjust_range;
+ else if (pr->mask & 1<<RANGE_BLACKS)
pr->get_adjust_range = get_blacks_adjust_range;
+ else
+ av_assert0(0);
+ }
+ }
+ }
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_RGB32,
AV_PIX_FMT_0RGB32, AV_PIX_FMT_NONE};
+ AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+static inline int comp_adjust(int adjust_range, int value, float adjust, int
relative)
+{
+ const float left_pcent = value / 255.;
+ const float right_pcent = 1. - value / 255.;
+ if (relative)
+ adjust *= right_pcent; // XXX: to be confirmed
+ return lrint(av_clipf(-adjust, -left_pcent, right_pcent) * adjust_range);
+}
+
+static inline int absolute_comp_adjust(int adjust_range, int value, float
adjust)
+{
+ return comp_adjust(adjust_range, value, adjust, 0);
+}
+
+static inline int relative_comp_adjust(int adjust_range, int value, float
adjust)
+{
+ return comp_adjust(adjust_range, value, adjust, 1);
+}
+
+static inline int selective_color(AVFilterContext *ctx, ThreadData *td,
+ int jobnr, int nb_jobs, int direct, int
relative)
+{
+ int i, x, y;
+ const AVFrame *in = td->in;
+ AVFrame *out = td->out;
+ const SelectiveColorContext *s = ctx->priv;
+ const int height = in->height;
+ const int width = in->width;
+ const int slice_start = (height * jobnr ) / nb_jobs;
+ const int slice_end = (height * (jobnr+1)) / nb_jobs;
+ const int dst_linesize = out->linesize[0];
+ const int src_linesize = in->linesize[0];
+ uint8_t *dst = out->data[0] + slice_start * dst_linesize;
+ const uint8_t *src = in->data[0] + slice_start * src_linesize;
+
+ for (y = slice_start; y < slice_end; y++) {
+ const uint32_t *src32 = (const uint32_t *)src;
+ uint32_t *dst32 = (uint32_t *)dst;
+
+ for (x = 0; x < width; x++) {
+ const uint32_t color = *src32++;
+ const int r = color >> 16 & 0xff;
+ const int g = color >> 8 & 0xff;
+ const int b = color & 0xff;
+ const int min_color = FFMIN3(r, g, b);
+ const int max_color = FFMAX3(r, g, b);
+ const uint32_t range_flag = (r == max_color) << RANGE_REDS
+ | (r == min_color) << RANGE_CYANS
+ | (g == max_color) << RANGE_GREENS
+ | (g == min_color) << RANGE_MAGENTAS
+ | (b == max_color) << RANGE_BLUES
+ | (b == min_color) << RANGE_YELLOWS
+ | (r > 128 && g > 128 && b > 128) <<
RANGE_WHITES
+ | (color && (color & 0xffffff) !=
0xffffff) << RANGE_NEUTRALS
+ | (r < 128 && g < 128 && b < 128) <<
RANGE_BLACKS;
+
+ int adjust_r = 0, adjust_g = 0, adjust_b = 0;
+
+ for (i = 0; i < s->nb_process_ranges; i++) {
+ const struct process_range *pr = &s->process_ranges[i];
+
+ if (range_flag & pr->mask) {
+ const int adjust_range = pr->get_adjust_range(r, g, b,
min_color, max_color);
+
+ if (adjust_range > 0) {
+ const float *cmyk_adjust =
s->cmyk_adjust[pr->range_id];
+
+ if (relative) {
+ adjust_r += relative_comp_adjust(adjust_range, r,
cmyk_adjust[0] + cmyk_adjust[3]);
+ adjust_g += relative_comp_adjust(adjust_range, g,
cmyk_adjust[1] + cmyk_adjust[3]);
+ adjust_b += relative_comp_adjust(adjust_range, b,
cmyk_adjust[2] + cmyk_adjust[3]);
+ } else {
+ adjust_r += absolute_comp_adjust(adjust_range, r,
cmyk_adjust[0] + cmyk_adjust[3]);
+ adjust_g += absolute_comp_adjust(adjust_range, g,
cmyk_adjust[1] + cmyk_adjust[3]);
+ adjust_b += absolute_comp_adjust(adjust_range, b,
cmyk_adjust[2] + cmyk_adjust[3]);
+ }
+ }
+ }
+ }
+
+ if (!direct || adjust_r || adjust_g || adjust_b)
+ *dst32 = (color & 0xff000000)
+ | av_clip_uint8(r + adjust_r) << 16
+ | av_clip_uint8(g + adjust_g) << 8
+ | av_clip_uint8(b + adjust_b);
+ dst32++;
+ }
+ src += src_linesize;
+ dst += dst_linesize;
+ }
+ return 0;
+}
+
+#define DEF_SELECTIVE_COLOR_FUNC(name, direct, relative)
\
+static int selective_color_##name(AVFilterContext *ctx, void *arg, int jobnr,
int nb_jobs) \
+{
\
+ return selective_color(ctx, arg, jobnr, nb_jobs, direct, relative);
\
+}
+
+DEF_SELECTIVE_COLOR_FUNC(indirect_absolute, 0, 0)
+DEF_SELECTIVE_COLOR_FUNC(indirect_relative, 0, 1)
+DEF_SELECTIVE_COLOR_FUNC( direct_absolute, 1, 0)
+DEF_SELECTIVE_COLOR_FUNC( direct_relative, 1, 1)
+
+typedef int (*selective_color_func_type)(AVFilterContext *ctx, void *td, int
jobnr, int nb_jobs);
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ int direct;
+ AVFrame *out;
+ ThreadData td;
+ const SelectiveColorContext *s = ctx->priv;
+ static selective_color_func_type funcs[2][2] = {
+ {selective_color_indirect_absolute, selective_color_indirect_relative},
+ {selective_color_direct_absolute, selective_color_direct_relative},
+ };
+
+ if (av_frame_is_writable(in)) {
+ direct = 1;
+ out = in;
+ } else {
+ direct = 0;
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out) {
+ av_frame_free(&in);
+ return AVERROR(ENOMEM);
+ }
+ av_frame_copy_props(out, in);
+ }
+
+ td.in = in;
+ td.out = out;
+ ctx->internal->execute(ctx, funcs[direct][s->relative], &td, NULL,
+ FFMIN(inlink->h, ctx->graph->nb_threads));
+
+ if (!direct)
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, out);
+}
+
+
+static const AVFilterPad selectivecolor_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad selectivecolor_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_selectivecolor = {
+ .name = "selectivecolor",
+ .description = NULL_IF_CONFIG_SMALL("Apply CMYK adjustments to specific
color ranges."),
+ .priv_size = sizeof(SelectiveColorContext),
+ .init = init,
+ .query_formats = query_formats,
+ .inputs = selectivecolor_inputs,
+ .outputs = selectivecolor_outputs,
+ .priv_class = &selectivecolor_class,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
AVFILTER_FLAG_SLICE_THREADS,
+};
--
2.4.5
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