--- /dev/null
+/*
+ * Copyright (c) 2021 Paul B Mahol
+ *
+ * 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
+ */
+
+#include <float.h>
+
+#include "libavutil/opt.h"
+#include "libavutil/imgutils.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct ColorCorrectContext {
+ const AVClass *class;
+
+ float rl, bl;
+ float rh, bh;
+ float saturation;
+
+ int depth;
+
+ int (*do_slice)(AVFilterContext *s, void *arg,
+ int jobnr, int nb_jobs);
+} ColorCorrectContext;
+
+#define PROCESS() \
+ float y = yptr[x] * imax; \
+ float u = uptr[x] * imax - .5f; \
+ float v = vptr[x] * imax - .5f; \
+ float ny, nu, nv; \
+ \
+ ny = y; \
+ nu = saturation * (u + y * bd + bl); \
+ nv = saturation * (v + y * rd + rl);
+
+static int colorcorrect_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+ ColorCorrectContext *s = ctx->priv;
+ AVFrame *frame = arg;
+ const int depth = s->depth;
+ const float max = (1 << depth) - 1;
+ const float imax = 1.f / max;
+ const int width = frame->width;
+ const int height = frame->height;
+ const int slice_start = (height * jobnr) / nb_jobs;
+ const int slice_end = (height * (jobnr + 1)) / nb_jobs;
+ const int ylinesize = frame->linesize[0];
+ const int ulinesize = frame->linesize[1];
+ const int vlinesize = frame->linesize[2];
+ uint8_t *yptr = frame->data[0] + slice_start * ylinesize;
+ uint8_t *uptr = frame->data[1] + slice_start * ulinesize;
+ uint8_t *vptr = frame->data[2] + slice_start * vlinesize;
+ const float saturation = s->saturation;
+ const float bl = s->bl;
+ const float rl = s->rl;
+ const float bd = s->bh - bl;
+ const float rd = s->rh - rl;
+
+ for (int y = slice_start; y < slice_end; y++) {
+ for (int x = 0; x < width; x++) {
+ PROCESS()
+
+ yptr[x] = av_clip_uint8( ny * max);
+ uptr[x] = av_clip_uint8((nu + 0.5f) * max);
+ vptr[x] = av_clip_uint8((nv + 0.5f) * max);
+ }
+
+ yptr += ylinesize;
+ uptr += ulinesize;
+ vptr += vlinesize;
+ }
+
+ return 0;
+}
+
+static int colorcorrect_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+ ColorCorrectContext *s = ctx->priv;
+ AVFrame *frame = arg;
+ const int depth = s->depth;
+ const float max = (1 << depth) - 1;
+ const float imax = 1.f / max;
+ const int width = frame->width;
+ const int height = frame->height;
+ const int slice_start = (height * jobnr) / nb_jobs;
+ const int slice_end = (height * (jobnr + 1)) / nb_jobs;
+ const int ylinesize = frame->linesize[0] / 2;
+ const int ulinesize = frame->linesize[1] / 2;
+ const int vlinesize = frame->linesize[2] / 2;
+ uint16_t *yptr = (uint16_t *)frame->data[0] + slice_start * ylinesize;
+ uint16_t *uptr = (uint16_t *)frame->data[1] + slice_start * ulinesize;
+ uint16_t *vptr = (uint16_t *)frame->data[2] + slice_start * vlinesize;
+ const float saturation = s->saturation;
+ const float bl = s->bl;
+ const float rl = s->rl;
+ const float bd = s->bh - bl;
+ const float rd = s->rh - rl;
+
+ for (int y = slice_start; y < slice_end; y++) {
+ for (int x = 0; x < width; x++) {
+ PROCESS()
+
+ yptr[x] = av_clip_uintp2_c( ny * max, depth);
+ uptr[x] = av_clip_uintp2_c((nu + 0.5f) * max, depth);
+ vptr[x] = av_clip_uintp2_c((nv + 0.5f) * max, depth);
+ }
+
+ yptr += ylinesize;
+ uptr += ulinesize;
+ vptr += vlinesize;
+ }
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ AVFilterContext *ctx = inlink->dst;
+ ColorCorrectContext *s = ctx->priv;
+
+ ctx->internal->execute(ctx, s->do_slice, frame, NULL,
+ FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
+
+ return ff_filter_frame(ctx->outputs[0], frame);
+}
+
+static av_cold int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pixel_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
+ AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV444P16,
+ AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
+ AV_PIX_FMT_NONE
+ };
+
+ AVFilterFormats *formats = NULL;
+
+ formats = ff_make_format_list(pixel_fmts);
+ if (!formats)
+ return AVERROR(ENOMEM);
+
+ return ff_set_common_formats(ctx, formats);
+}
+
+static av_cold int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ ColorCorrectContext *s = ctx->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+
+ s->depth = desc->comp[0].depth;
+ s->do_slice = s->depth <= 8 ? colorcorrect_slice8 : colorcorrect_slice16;
+
+ return 0;
+}
+
+static const AVFilterPad colorcorrect_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .needs_writable = 1,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ },
+ { NULL }
+};
+
+static const AVFilterPad colorcorrect_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+#define OFFSET(x) offsetof(ColorCorrectContext, x)
+#define VF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
+
+static const AVOption colorcorrect_options[] = {
+ { "rl", "set the red shadow spot", OFFSET(rl), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
+ { "bl", "set the blue shadow spot", OFFSET(bl), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
+ { "rh", "set the red highlight spot", OFFSET(rh), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
+ { "bh", "set the blue highlight spot", OFFSET(bh), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
+ { "saturation", "set the amount of saturation", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl=1}, -3, 3, VF },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(colorcorrect);
+
+AVFilter ff_vf_colorcorrect = {
+ .name = "colorcorrect",
+ .description = NULL_IF_CONFIG_SMALL("Adjust color white balance selectively for blacks and whites."),
+ .priv_size = sizeof(ColorCorrectContext),
+ .priv_class = &colorcorrect_class,
+ .query_formats = query_formats,
+ .inputs = colorcorrect_inputs,
+ .outputs = colorcorrect_outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
+ .process_command = ff_filter_process_command,
+};
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