mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
avfilter: add exposure video filter
This commit is contained in:
parent
579e4e57a2
commit
4390573c44
@ -70,6 +70,7 @@ version <next>:
|
||||
- colorize filter
|
||||
- CRI parser
|
||||
- aexciter audio filter
|
||||
- exposure video filter
|
||||
|
||||
|
||||
version 4.3:
|
||||
|
@ -11375,6 +11375,25 @@ Six-point interpolation.
|
||||
@subsection Commands
|
||||
This filter supports same @ref{commands} as options.
|
||||
|
||||
@section exposure
|
||||
Adjust exposure of the video stream.
|
||||
|
||||
The filter accepts the following options:
|
||||
|
||||
@table @option
|
||||
@item exposure
|
||||
Set the exposure correction in EV. Allowed range is from -3.0 to 3.0 EV
|
||||
Default value is 0 EV.
|
||||
|
||||
@item black
|
||||
Set the black level correction. Allowed range is from -1.0 to 1.0.
|
||||
Default value is 0.
|
||||
@end table
|
||||
|
||||
@subsection Commands
|
||||
|
||||
This filter supports same @ref{commands} as options.
|
||||
|
||||
@section extractplanes
|
||||
|
||||
Extract color channel components from input video stream into
|
||||
|
@ -259,6 +259,7 @@ OBJS-$(CONFIG_EROSION_FILTER) += vf_neighbor.o
|
||||
OBJS-$(CONFIG_EROSION_OPENCL_FILTER) += vf_neighbor_opencl.o opencl.o \
|
||||
opencl/neighbor.o
|
||||
OBJS-$(CONFIG_ESTDIF_FILTER) += vf_estdif.o
|
||||
OBJS-$(CONFIG_EXPOSURE_FILTER) += vf_exposure.o
|
||||
OBJS-$(CONFIG_EXTRACTPLANES_FILTER) += vf_extractplanes.o
|
||||
OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o
|
||||
OBJS-$(CONFIG_FFTDNOIZ_FILTER) += vf_fftdnoiz.o
|
||||
|
@ -244,6 +244,7 @@ extern AVFilter ff_vf_eq;
|
||||
extern AVFilter ff_vf_erosion;
|
||||
extern AVFilter ff_vf_erosion_opencl;
|
||||
extern AVFilter ff_vf_estdif;
|
||||
extern AVFilter ff_vf_exposure;
|
||||
extern AVFilter ff_vf_extractplanes;
|
||||
extern AVFilter ff_vf_fade;
|
||||
extern AVFilter ff_vf_fftdnoiz;
|
||||
|
@ -30,7 +30,7 @@
|
||||
#include "libavutil/version.h"
|
||||
|
||||
#define LIBAVFILTER_VERSION_MAJOR 7
|
||||
#define LIBAVFILTER_VERSION_MINOR 104
|
||||
#define LIBAVFILTER_VERSION_MINOR 105
|
||||
#define LIBAVFILTER_VERSION_MICRO 100
|
||||
|
||||
|
||||
|
144
libavfilter/vf_exposure.c
Normal file
144
libavfilter/vf_exposure.c
Normal file
@ -0,0 +1,144 @@
|
||||
/*
|
||||
* 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 ExposureContext {
|
||||
const AVClass *class;
|
||||
|
||||
float exposure;
|
||||
float black;
|
||||
|
||||
float scale;
|
||||
int (*do_slice)(AVFilterContext *s, void *arg,
|
||||
int jobnr, int nb_jobs);
|
||||
} ExposureContext;
|
||||
|
||||
static int exposure_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
|
||||
{
|
||||
ExposureContext *s = ctx->priv;
|
||||
AVFrame *frame = arg;
|
||||
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 float black = s->black;
|
||||
const float scale = s->scale;
|
||||
|
||||
for (int p = 0; p < 3; p++) {
|
||||
const int linesize = frame->linesize[p] / 4;
|
||||
float *ptr = (float *)frame->data[p] + slice_start * linesize;
|
||||
for (int y = slice_start; y < slice_end; y++) {
|
||||
for (int x = 0; x < width; x++)
|
||||
ptr[x] = (ptr[x] - black) * scale;
|
||||
|
||||
ptr += linesize;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
|
||||
{
|
||||
AVFilterContext *ctx = inlink->dst;
|
||||
ExposureContext *s = ctx->priv;
|
||||
|
||||
s->scale = 1.f / (exp2f(-s->exposure) - s->black);
|
||||
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_GBRPF32, AV_PIX_FMT_GBRAPF32,
|
||||
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;
|
||||
ExposureContext *s = ctx->priv;
|
||||
|
||||
s->do_slice = exposure_slice;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const AVFilterPad exposure_inputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.needs_writable = 1,
|
||||
.filter_frame = filter_frame,
|
||||
.config_props = config_input,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
static const AVFilterPad exposure_outputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
#define OFFSET(x) offsetof(ExposureContext, x)
|
||||
#define VF AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
|
||||
|
||||
static const AVOption exposure_options[] = {
|
||||
{ "exposure", "set the exposure correction", OFFSET(exposure), AV_OPT_TYPE_FLOAT, {.dbl=0}, -3, 3, VF },
|
||||
{ "black", "set the black level correction", OFFSET(black), AV_OPT_TYPE_FLOAT, {.dbl=0}, -1, 1, VF },
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
AVFILTER_DEFINE_CLASS(exposure);
|
||||
|
||||
AVFilter ff_vf_exposure = {
|
||||
.name = "exposure",
|
||||
.description = NULL_IF_CONFIG_SMALL("Adjust exposure of the video stream."),
|
||||
.priv_size = sizeof(ExposureContext),
|
||||
.priv_class = &exposure_class,
|
||||
.query_formats = query_formats,
|
||||
.inputs = exposure_inputs,
|
||||
.outputs = exposure_outputs,
|
||||
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
|
||||
.process_command = ff_filter_process_command,
|
||||
};
|
Loading…
Reference in New Issue
Block a user