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FFmpeg/libavfilter/vf_hsvkey.c
Paul B Mahol 02aa7dc423 avfilter: add hsvkey and hsvhold video filters
2021-08-25 20:43:18 +02:00

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/*
* 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 "libavutil/intreadwrite.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct HSVKeyContext {
const AVClass *class;
float hue, hue_opt, sat, val;
float similarity;
float blend;
float scale;
float half;
int depth;
int max;
int hsub_log2;
int vsub_log2;
int (*do_slice)(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs);
} HSVKeyContext;
#define SQR(x) ((x)*(x))
static int do_hsvkey_pixel(HSVKeyContext *s, int y, int u, int v,
float hue_key, float sat_key, float val_key)
{
const float similarity = s->similarity;
const float scale = s->scale;
const float blend = s->blend;
const int imax = s->max;
const float max = imax;
const float half = s->half;
const float uf = u - half;
const float vf = v - half;
const float hue = hue_key < 0.f ? -hue_key : atan2f(uf, vf) + M_PI;
const float sat = sat_key < 0.f ? -sat_key : sqrtf((uf * uf + vf * vf) / (half * half * 2.f));
const float val = val_key < 0.f ? -val_key : scale * y;
float diff;
hue_key = fabsf(hue_key);
sat_key = fabsf(sat_key);
val_key = fabsf(val_key);
diff = sqrtf(fmaxf(SQR(sat) * SQR(val) +
SQR(sat_key) * SQR(val_key) -
2.f * sat * val * sat_key * val_key * cosf(hue_key - hue) +
SQR(val - val_key), 0.f));
if (diff < similarity) {
return 0;
} else if (blend > FLT_MIN) {
return av_clipf((diff - similarity) / blend, 0.f, 1.f) * max;
} else {
return imax;
}
return 0;
}
static int do_hsvkey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
HSVKeyContext *s = avctx->priv;
AVFrame *frame = arg;
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
const int hsub_log2 = s->hsub_log2;
const int vsub_log2 = s->vsub_log2;
const float hue = s->hue;
const float sat = s->sat;
const float val = s->val;
for (int y = slice_start; y < slice_end; y++) {
for (int x = 0; x < frame->width; x++) {
int Y = frame->data[0][frame->linesize[0] * y + x];
int u = frame->data[1][frame->linesize[1] * (y >> vsub_log2) + (x >> hsub_log2)];
int v = frame->data[2][frame->linesize[2] * (y >> vsub_log2) + (x >> hsub_log2)];
frame->data[3][frame->linesize[3] * y + x] = do_hsvkey_pixel(s, Y, u, v, hue, sat, val);
}
}
return 0;
}
static int do_hsvkey16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
HSVKeyContext *s = avctx->priv;
AVFrame *frame = arg;
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
const int hsub_log2 = s->hsub_log2;
const int vsub_log2 = s->vsub_log2;
const float hue = s->hue;
const float sat = s->sat;
const float val = s->val;
for (int y = slice_start; y < slice_end; ++y) {
for (int x = 0; x < frame->width; ++x) {
uint16_t *dst = (uint16_t *)(frame->data[3] + frame->linesize[3] * y);
int Y = AV_RN16(&frame->data[0][frame->linesize[0] * y + 2 * x]);
int u = AV_RN16(&frame->data[1][frame->linesize[1] * (y >> vsub_log2) + 2 * (x >> hsub_log2)]);
int v = AV_RN16(&frame->data[2][frame->linesize[2] * (y >> vsub_log2) + 2 * (x >> hsub_log2)]);
dst[x] = do_hsvkey_pixel(s, Y, u, v, hue, sat, val);
}
}
return 0;
}
static int do_hsvhold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
HSVKeyContext *s = avctx->priv;
AVFrame *frame = arg;
const int hsub_log2 = s->hsub_log2;
const int vsub_log2 = s->vsub_log2;
const int width = frame->width >> hsub_log2;
const int height = frame->height >> vsub_log2;
const int slice_start = (height * jobnr) / nb_jobs;
const int slice_end = (height * (jobnr + 1)) / nb_jobs;
const float scale = s->scale;
const float hue = s->hue;
const float sat = s->sat;
const float val = s->val;
for (int y = slice_start; y < slice_end; ++y) {
for (int x = 0; x < width; ++x) {
uint8_t *dstu = frame->data[1] + frame->linesize[1] * y;
uint8_t *dstv = frame->data[2] + frame->linesize[2] * y;
int Y = frame->data[0][frame->linesize[0] * (y << vsub_log2) + (x << hsub_log2)];
int u = frame->data[1][frame->linesize[1] * y + x];
int v = frame->data[2][frame->linesize[2] * y + x];
int t = do_hsvkey_pixel(s, Y, u, v, hue, sat, val);
if (t > 0) {
float f = 1.f - t * scale;
dstu[x] = 128 + (u - 128) * f;
dstv[x] = 128 + (v - 128) * f;
}
}
}
return 0;
}
static int do_hsvhold16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
HSVKeyContext *s = avctx->priv;
AVFrame *frame = arg;
const int hsub_log2 = s->hsub_log2;
const int vsub_log2 = s->vsub_log2;
const int width = frame->width >> hsub_log2;
const int height = frame->height >> vsub_log2;
const int slice_start = (height * jobnr) / nb_jobs;
const int slice_end = (height * (jobnr + 1)) / nb_jobs;
const float scale = s->scale;
const float half = s->half;
const float hue = s->hue;
const float sat = s->sat;
const float val = s->val;
for (int y = slice_start; y < slice_end; ++y) {
for (int x = 0; x < width; ++x) {
uint16_t *dstu = (uint16_t *)(frame->data[1] + frame->linesize[1] * y);
uint16_t *dstv = (uint16_t *)(frame->data[2] + frame->linesize[2] * y);
int Y = AV_RN16(&frame->data[0][frame->linesize[0] * (y << vsub_log2) + 2 * (x << hsub_log2)]);
int u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
int v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
int t = do_hsvkey_pixel(s, Y, u, v, hue, sat, val);
if (t > 0) {
float f = 1.f - t * scale;
dstu[x] = half + (u - half) * f;
dstv[x] = half + (v - half) * f;
}
}
}
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *avctx = link->dst;
HSVKeyContext *s = avctx->priv;
int res;
s->hue = FFSIGN(s->hue_opt) *M_PI * fmodf(526.f - fabsf(s->hue_opt), 360.f) / 180.f;
if (res = ff_filter_execute(avctx, s->do_slice, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
return res;
return ff_filter_frame(avctx->outputs[0], frame);
}
static av_cold int config_output(AVFilterLink *outlink)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
AVFilterContext *avctx = outlink->src;
HSVKeyContext *s = avctx->priv;
s->depth = desc->comp[0].depth;
s->max = (1 << s->depth) - 1;
s->half = 0.5f * s->max;
s->scale = 1.f / s->max;
if (!strcmp(avctx->filter->name, "hsvkey")) {
s->do_slice = s->depth <= 8 ? do_hsvkey_slice : do_hsvkey16_slice;
} else {
s->do_slice = s->depth <= 8 ? do_hsvhold_slice: do_hsvhold16_slice;
}
return 0;
}
static av_cold int query_formats(AVFilterContext *avctx)
{
static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVA422P,
AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat hold_pixel_fmts[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVA422P,
AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
const enum AVPixelFormat *pix_fmts;
pix_fmts = !strcmp(avctx->filter->name, "hsvhold") ? hold_pixel_fmts : pixel_fmts;
return ff_set_common_formats_from_list(avctx, pix_fmts);
}
static av_cold int config_input(AVFilterLink *inlink)
{
AVFilterContext *avctx = inlink->dst;
HSVKeyContext *s = avctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
s->hsub_log2 = desc->log2_chroma_w;
s->vsub_log2 = desc->log2_chroma_h;
return 0;
}
static const AVFilterPad hsvkey_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
static const AVFilterPad hsvkey_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
#define OFFSET(x) offsetof(HSVKeyContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption hsvkey_options[] = {
{ "hue", "set the hue value", OFFSET(hue_opt), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -360, 360, FLAGS },
{ "sat", "set the saturation value", OFFSET(sat), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -1, 1, FLAGS },
{ "val", "set the value value", OFFSET(val), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -1, 1, FLAGS },
{ "similarity", "set the hsvkey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01}, 0.00001, 1.0, FLAGS },
{ "blend", "set the hsvkey blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(hsvkey);
const AVFilter ff_vf_hsvkey = {
.name = "hsvkey",
.description = NULL_IF_CONFIG_SMALL("Turns a certain HSV range into transparency. Operates on YUV colors."),
.priv_size = sizeof(HSVKeyContext),
.priv_class = &hsvkey_class,
.query_formats = query_formats,
FILTER_INPUTS(hsvkey_inputs),
FILTER_OUTPUTS(hsvkey_outputs),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = ff_filter_process_command,
};
static const AVOption hsvhold_options[] = {
{ "hue", "set the hue value", OFFSET(hue_opt), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -360, 360, FLAGS },
{ "sat", "set the saturation value", OFFSET(sat), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -1, 1, FLAGS },
{ "val", "set the value value", OFFSET(val), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -1, 1, FLAGS },
{ "similarity", "set the hsvhold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.00001, 1.0, FLAGS },
{ "blend", "set the hsvhold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
{ NULL }
};
static const AVFilterPad hsvhold_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
static const AVFilterPad hsvhold_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
AVFILTER_DEFINE_CLASS(hsvhold);
const AVFilter ff_vf_hsvhold = {
.name = "hsvhold",
.description = NULL_IF_CONFIG_SMALL("Turns a certain HSV range into gray."),
.priv_size = sizeof(HSVKeyContext),
.priv_class = &hsvhold_class,
.query_formats = query_formats,
FILTER_INPUTS(hsvhold_inputs),
FILTER_OUTPUTS(hsvhold_outputs),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = ff_filter_process_command,
};
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