[FFmpeg-devel] [PATCH] [add video filter hsl(Hue, Saturation, Lightness)]
Paul B Mahol
onemda at gmail.com
Wed Jan 11 23:10:08 EET 2023
On 1/11/23, liuyizhuo <yizhuo.liu753 at gmail.com> wrote:
> From: "2498228118 at qq.com" <2498228118 at qq.com>
>
> ---
> libavfilter/Makefile | 1 +
> libavfilter/allfilters.c | 1 +
> libavfilter/vf_hsl.c | 310 ++++++++++++++++++++++++++++++++++++
> tests/fate-run.sh | 2 +
> tests/fate/filter-video.mak | 3 +
> tests/ref/fate/filter-hsl | 1 +
> 6 files changed, 318 insertions(+)
> create mode 100644 libavfilter/vf_hsl.c
> create mode 100644 tests/ref/fate/filter-hsl
>
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index 5783be281d..b9ed9e065a 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -182,6 +182,7 @@ OBJS-$(CONFIG_SINE_FILTER) +=
> asrc_sine.o
> OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
>
> # video filters
> +OBJS-$(CONFIG_HSL_FILTER) += vf_hsl.o
> OBJS-$(CONFIG_ADDROI_FILTER) += vf_addroi.o
> OBJS-$(CONFIG_ALPHAEXTRACT_FILTER) += vf_extractplanes.o
> OBJS-$(CONFIG_ALPHAMERGE_FILTER) += vf_alphamerge.o
> framesync.o
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index 52741b60e4..6910189ce4 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -169,6 +169,7 @@ extern const AVFilter ff_asrc_sine;
>
> extern const AVFilter ff_asink_anullsink;
>
> +extern const AVFilter ff_vf_hsl;
> extern const AVFilter ff_vf_addroi;
> extern const AVFilter ff_vf_alphaextract;
> extern const AVFilter ff_vf_alphamerge;
> diff --git a/libavfilter/vf_hsl.c b/libavfilter/vf_hsl.c
> new file mode 100644
> index 0000000000..47c9af9120
> --- /dev/null
> +++ b/libavfilter/vf_hsl.c
> @@ -0,0 +1,310 @@
> +/*
> + * Copyright (c) 2022 Wang Wei <wangwei1237 at gmail.com>
> + * Copyright (c) 2022 Liu yizhuo <yizhuo.liu753 at gmail.com>
> + *
> + * 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
> + */
> +
> +/**
> + * @file
> + * Calculate the HSL color space information.
> + * HSL is a color space that is more perceptually uniform than RGB :
> + * https://en.wikipedia.org/wiki/HSL_and_HSV
better integrate this into signalstats filter, as it does not do
compare of 2 inputs.
> + */
> +
> +#include <math.h>
> +
> +#include "libavutil/imgutils.h"
> +#include "libavutil/internal.h"
> +#include "libavutil/opt.h"
> +#include "libswscale/swscale.h"
> +
> +#include "avfilter.h"
> +#include "formats.h"
> +#include "internal.h"
> +#include "video.h"
> +
> +typedef float num;
> +
> +typedef struct HSL_COLOR {
> + num H;
> + num S;
> + num L;
> +} HSL_COLOR;
> +
> +typedef struct HSLContext {
> + const AVClass *class;
> + int width, height;
> + uint64_t nb_frames;
> + float max_hue, max_sat, max_light;
> + float min_hue, min_sat, min_light;
> + float sum_hue, sum_sat, sum_light;
> + int print_summary;
> + AVFrame *rgbFrame;
> + enum AVPixelFormat rgb_format;
> +} HSLContext;
> +
> +static const enum AVPixelFormat pix_fmts[] = {
> + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
> + AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
> + AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10,
> + AV_PIX_FMT_NONE
> +};
> +
> +static av_cold int init(AVFilterContext *ctx)
> +{
> + // User options but no input data
> + HSLContext *s = ctx->priv;
> + s->max_hue = 0;
> + s->max_sat = 0;
> + s->max_light = 0;
> +
> + return 0;
> +}
> +
> +static av_cold void uninit(AVFilterContext *ctx)
> +{
> + HSLContext *s = ctx->priv;
> +
> + if (s->print_summary) {
> + float avg_hue = s->sum_hue / s->nb_frames;
> + float avg_sat = s->sum_sat / s->nb_frames;
> + float avg_light = s->sum_light / s->nb_frames;
> + av_log(ctx, AV_LOG_INFO,
> + "HSL Summary:\nTotal frames: %"PRId64"\n\n"
> + "Hue Information:\nAverage: %.1f\nMax: %.1f\nMin: %.1f\n\n"
> + "Saturation Information:\nAverage: %.1f\nMax: %.1f\nMin:
> %.1f\n\n"
> + "Lightness Information:\nAverage: %.1f\nMax: %.1f\nMin:
> %.1f\n\n",
> + s->nb_frames,
> + avg_hue, s->max_hue, s->min_hue,
> + avg_sat * 100, s->max_sat * 100, s->min_sat * 100,
> + avg_light * 100, s->max_light * 100, s->min_light * 100
> + );
> + }
> +
> + av_frame_free(&s->rgbFrame);
> +}
> +
> +static int config_input(AVFilterLink *inlink)
> +{
> + // Video input data avilable
> + AVFilterContext *ctx = inlink->dst;
> + HSLContext *s = ctx->priv;
> +
> + // free previous buffers in case they are allocated already
> + av_frame_free(&s->rgbFrame);
> + s->width = inlink->w;
> + s->height = inlink->h;
> + s->rgb_format = AV_PIX_FMT_RGB24;
> + s->rgbFrame = av_frame_alloc();
> + if (!s->rgbFrame) {
> + return AVERROR(ENOMEM);
> + }
> +
> + s->rgbFrame->format = s->rgb_format;
> + s->rgbFrame->width = s->width;
> + s->rgbFrame->height = s->height;
> + if (av_frame_get_buffer(s->rgbFrame, 0)) {
> + return AVERROR(ENOMEM);
> + }
> +
> + return 0;
> +}
> +
> +static void set_meta(AVDictionary **metadata, const char *key, float d)
> +{
> + char value[128];
> + snprintf(value, sizeof(value), "%0.1f", d);
> + av_dict_set(metadata, key, value, 0);
> +}
> +
> +static void YUV2RGB(const AVFrame* src, enum AVPixelFormat dstFormat,
> AVFrame* dst)
> +{
> + int width = src->width;
> + int height = src->height;
> +
> + struct SwsContext* conversion = NULL;
> + conversion = sws_getContext(width,
> + height,
> + (enum AVPixelFormat)src->format,
> + width,
> + height,
> + dstFormat,
> + SWS_FAST_BILINEAR,
> + NULL,
> + NULL,
> + NULL);
> + sws_scale(conversion, src->data, src->linesize, 0, height, dst->data,
> dst->linesize);
> + sws_freeContext(conversion);
> +}
> +
> +static const float EPSILON = 1e-9;
> +
> +/** @brief Min of A and B */
> +#define MIN(A,B) (((A) <= (B)) ? (A) : (B))
> +
> +/** @brief Max of A and B */
> +#define MAX(A,B) (((A) >= (B)) ? (A) : (B))
> +
> +/** @brief Min of A, B, and C */
> +#define MIN3(A,B,C) (((A) <= (B)) ? MIN(A,C) : MIN(B,C))
> +
> +/** @brief Max of A, B, and C */
> +#define MAX3(A,B,C) (((A) >= (B)) ? MAX(A,C) : MAX(B,C))
> +
> +/** @brief Equal of A and B */
> +#define EQ(A,B) ((fabs((A) - (B)) < EPSILON) ? 1 : 0)
> +
> +
> +/**
> + * @brief Convert an sRGB color to Hue-Saturation-Lightness (HSL)
> + *
> + * @param H, S, L pointers to hold the result
> + * @param R, G, B the input sRGB values scaled in [0,1]
> + *
> + * This routine transforms from sRGB to the double hexcone HSL color space
> + * The sRGB values are assumed to be between 0 and 1. The outputs are
> + * H = hexagonal hue angle (0 <= H < 360),
> + * S = { C/(2L) if L <= 1/2 (0 <= S <= 1),
> + * { C/(2 - 2L) if L > 1/2
> + * L = (max(R',G',B') + min(R',G',B'))/2 (0 <= L <= 1),
> + * where C = max(R',G',B') - min(R',G',B').
> + *
> + * Wikipedia: http://en.wikipedia.org/wiki/HSL_and_HSV
> + */
> +static void RGB2HSL(num *H, num *S, num *L, num R, num G, num B)
> +{
> + num Max = MAX3(R, G, B);
> + num Min = MIN3(R, G, B);
> + num C = Max - Min;
> +
> + *L = (Max + Min) / 2;
> +
> + if (C > 0) {
> + if (EQ(Max, R)) {
> + *H = (G - B) / C;
> +
> + if (G < B) {
> + *H += 6;
> + }
> + } else if (EQ(Max, G)) {
> + *H = 2 + (B - R) / C;
> + } else {
> + *H = 4 + (R - G) / C;
> + }
> +
> + *H *= 60;
> + *S = (*L <= 0.5) ? (C/(2*(*L))) : (C/(2 - 2*(*L)));
> + } else {
> + *H = *S = 0;
> + }
> +}
> +
> +static void calcHSL(HSLContext *ctx, AVFrame *frame, HSL_COLOR *hsl)
> +{
> + // Convert to RGB
> + YUV2RGB(frame, ctx->rgb_format, ctx->rgbFrame);
> +
> + int cnt = frame->width * frame->height;
> + num R = 0, G = 0, B = 0;
> + num H = 0, S = 0, L = 0;
> + num H_sum = 0, S_sum = 0, L_sum = 0;
> +
> + for (int i = 0; i < cnt; i++) {
> + R = ctx->rgbFrame->data[0][3 * i];
> + G = ctx->rgbFrame->data[0][3 * i + 1];
> + B = ctx->rgbFrame->data[0][3 * i + 2];
> + RGB2HSL(&H, &S, &L, R/255, G/255, B/255);
> + H_sum += H;
> + S_sum += S;
> + L_sum += L;
> + }
> +
> + hsl->H = H_sum / cnt;
> + hsl->S = S_sum / cnt;
> + hsl->L = L_sum / cnt;
> +
> + // av_log(ctx, AV_LOG_INFO, "H: %.1f, S: %.1f, L: %.1f\n",
> + // hsl->H, hsl->S * 100, hsl->L * 100);
> +}
> +
> +static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
> +{
> + AVFilterContext *ctx = inlink->dst;
> + HSLContext *s = ctx->priv;
> + s->nb_frames++;
> +
> + HSL_COLOR hsl;
> + calcHSL(s, frame, &hsl);
> +
> + // Calculate statistics
> + s->max_hue = fmaxf(hsl.H, s->max_hue);
> + s->max_sat = fmaxf(hsl.S, s->max_sat);
> + s->max_light = fmaxf(hsl.L, s->max_light);
> + s->sum_hue += hsl.H;
> + s->sum_sat += hsl.S;
> + s->sum_light += hsl.L;
> + s->min_hue = s->nb_frames == 1 ? hsl.H : fminf(hsl.H, s->min_hue);
> + s->min_sat = s->nb_frames == 1 ? hsl.S : fminf(hsl.S, s->min_sat);
> + s->min_light = s->nb_frames == 1 ? hsl.L : fminf(hsl.L,
> s->min_light);
> +
> + // Set HSL information in frame metadata
> + set_meta(&frame->metadata, "lavfi.hsl.hue", hsl.H);
> + set_meta(&frame->metadata, "lavfi.hsl.sat", hsl.S * 100);
> + set_meta(&frame->metadata, "lavfi.hsl.light", hsl.L * 100);
> +
> + return ff_filter_frame(inlink->dst->outputs[0], frame);
> +}
> +
> +#define OFFSET(x) offsetof(HSLContext, x)
> +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
> +
> +static const AVOption hsl_options[] = {
> + { "print_summary", "Print summary showing average values",
> OFFSET(print_summary), AV_OPT_TYPE_BOOL, { .i64=0 }, 0, 1, FLAGS },
> + { NULL }
> +};
> +
> +AVFILTER_DEFINE_CLASS(hsl);
> +
> +static const AVFilterPad avfilter_vf_hsl_inputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .config_props = config_input,
> + .filter_frame = filter_frame,
> + },
> +};
> +
> +static const AVFilterPad avfilter_vf_hsl_outputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO
> + },
> +};
> +
> +const AVFilter ff_vf_hsl = {
> + .name = "hsl",
> + .description = NULL_IF_CONFIG_SMALL("Calculate the HSL color space
> information."),
> + .priv_size = sizeof(HSLContext),
> + .priv_class = &hsl_class,
> + .init = init,
> + .uninit = uninit,
> + .flags = AVFILTER_FLAG_METADATA_ONLY,
> + FILTER_PIXFMTS_ARRAY(pix_fmts),
> + FILTER_INPUTS(avfilter_vf_hsl_inputs),
> + FILTER_OUTPUTS(avfilter_vf_hsl_outputs),
> +};
> diff --git a/tests/fate-run.sh b/tests/fate-run.sh
> index 61cc59acc0..c350570f5b 100755
> --- a/tests/fate-run.sh
> +++ b/tests/fate-run.sh
> @@ -1,5 +1,7 @@
> #! /bin/sh
>
> +set -x
> +
> export LC_ALL=C
>
> base=$(dirname $0)
> diff --git a/tests/fate/filter-video.mak b/tests/fate/filter-video.mak
> index 63873a7a07..aa9812aa18 100644
> --- a/tests/fate/filter-video.mak
> +++ b/tests/fate/filter-video.mak
> @@ -408,6 +408,9 @@ fate-filter-scale200: CMD = video_filter
> "scale=w=200:h=200"
> FATE_FILTER_VSYNTH_VIDEO_FILTER-$(CONFIG_SCALE_FILTER) +=
> fate-filter-scale500
> fate-filter-scale500: CMD = video_filter "scale=w=500:h=500"
>
> +FATE_FILTER_VSYNTH_VIDEO_FILTER-$(CONFIG_SCALE_FILTER) += fate-filter-hsl
> +fate-filter-hsl: CMD = video_filter "hsl=print_summary=1"
> +
> FATE_FILTER_VSYNTH-$(call ALLYES, TESTSRC_FILTER SCALE2REF_FILTER
> NULLSINK_FILTER FRAMEMD5_MUXER FILE_PROTOCOL PIPE_PROTOCOL) +=
> fate-filter-scale2ref_keep_aspect
> fate-filter-scale2ref_keep_aspect:
> tests/data/filtergraphs/scale2ref_keep_aspect
> fate-filter-scale2ref_keep_aspect: CMD = framemd5 -frames:v 5
> -filter_complex_script
> $(TARGET_PATH)/tests/data/filtergraphs/scale2ref_keep_aspect -map "[main]"
> diff --git a/tests/ref/fate/filter-hsl b/tests/ref/fate/filter-hsl
> new file mode 100644
> index 0000000000..ae0a064f46
> --- /dev/null
> +++ b/tests/ref/fate/filter-hsl
> @@ -0,0 +1 @@
> +hsl fcb007249fba9371fe84a61c974fcb00
> --
> 2.24.3 (Apple Git-128)
>
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