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FFmpeg/libavfilter/vf_lensfun.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback 
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

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/*
* Copyright (C) 2007 by Andrew Zabolotny (author of lensfun, from which this filter derives from)
* Copyright (C) 2018 Stephen Seo
*
* This file is part of FFmpeg.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/**
* @file
* Lensfun filter, applies lens correction with parameters from the lensfun database
*
* @see https://lensfun.sourceforge.net/
*/
#include <float.h>
#include <math.h>
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libswscale/swscale.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include <lensfun.h>
#define LANCZOS_RESOLUTION 256
enum Mode {
VIGNETTING = 0x1,
GEOMETRY_DISTORTION = 0x2,
SUBPIXEL_DISTORTION = 0x4
};
enum InterpolationType {
NEAREST,
LINEAR,
LANCZOS
};
typedef struct VignettingThreadData {
int width, height;
uint8_t *data_in;
int linesize_in;
int pixel_composition;
lfModifier *modifier;
} VignettingThreadData;
typedef struct DistortionCorrectionThreadData {
int width, height;
const float *distortion_coords;
const uint8_t *data_in;
uint8_t *data_out;
int linesize_in, linesize_out;
const float *interpolation;
int mode;
int interpolation_type;
} DistortionCorrectionThreadData;
typedef struct LensfunContext {
const AVClass *class;
const char *make, *model, *lens_model;
int mode;
float focal_length;
float aperture;
float focus_distance;
float scale;
int target_geometry;
int reverse;
int interpolation_type;
float *distortion_coords;
float *interpolation;
lfLens *lens;
lfCamera *camera;
lfModifier *modifier;
} LensfunContext;
#define OFFSET(x) offsetof(LensfunContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption lensfun_options[] = {
{ "make", "set camera maker", OFFSET(make), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "model", "set camera model", OFFSET(model), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "lens_model", "set lens model", OFFSET(lens_model), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=GEOMETRY_DISTORTION}, 0, VIGNETTING | GEOMETRY_DISTORTION | SUBPIXEL_DISTORTION, FLAGS, "mode" },
{ "vignetting", "fix lens vignetting", 0, AV_OPT_TYPE_CONST, {.i64=VIGNETTING}, 0, 0, FLAGS, "mode" },
{ "geometry", "correct geometry distortion", 0, AV_OPT_TYPE_CONST, {.i64=GEOMETRY_DISTORTION}, 0, 0, FLAGS, "mode" },
{ "subpixel", "fix chromatic aberrations", 0, AV_OPT_TYPE_CONST, {.i64=SUBPIXEL_DISTORTION}, 0, 0, FLAGS, "mode" },
{ "vig_geo", "fix lens vignetting and correct geometry distortion", 0, AV_OPT_TYPE_CONST, {.i64=VIGNETTING | GEOMETRY_DISTORTION}, 0, 0, FLAGS, "mode" },
{ "vig_subpixel", "fix lens vignetting and chromatic aberrations", 0, AV_OPT_TYPE_CONST, {.i64=VIGNETTING | SUBPIXEL_DISTORTION}, 0, 0, FLAGS, "mode" },
{ "distortion", "correct geometry distortion and chromatic aberrations", 0, AV_OPT_TYPE_CONST, {.i64=GEOMETRY_DISTORTION | SUBPIXEL_DISTORTION}, 0, 0, FLAGS, "mode" },
{ "all", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VIGNETTING | GEOMETRY_DISTORTION | SUBPIXEL_DISTORTION}, 0, 0, FLAGS, "mode" },
{ "focal_length", "focal length of video (zoom; constant for the duration of the use of this filter)", OFFSET(focal_length), AV_OPT_TYPE_FLOAT, {.dbl=18}, 0.0, DBL_MAX, FLAGS },
{ "aperture", "aperture (constant for the duration of the use of this filter)", OFFSET(aperture), AV_OPT_TYPE_FLOAT, {.dbl=3.5}, 0.0, DBL_MAX, FLAGS },
{ "focus_distance", "focus distance (constant for the duration of the use of this filter)", OFFSET(focus_distance), AV_OPT_TYPE_FLOAT, {.dbl=1000.0f}, 0.0, DBL_MAX, FLAGS },
{ "scale", "scale factor applied after corrections (0.0 means automatic scaling)", OFFSET(scale), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, DBL_MAX, FLAGS },
{ "target_geometry", "target geometry of the lens correction (only when geometry correction is enabled)", OFFSET(target_geometry), AV_OPT_TYPE_INT, {.i64=LF_RECTILINEAR}, 0, INT_MAX, FLAGS, "lens_geometry" },
{ "rectilinear", "rectilinear lens (default)", 0, AV_OPT_TYPE_CONST, {.i64=LF_RECTILINEAR}, 0, 0, FLAGS, "lens_geometry" },
{ "fisheye", "fisheye lens", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE}, 0, 0, FLAGS, "lens_geometry" },
{ "panoramic", "panoramic (cylindrical)", 0, AV_OPT_TYPE_CONST, {.i64=LF_PANORAMIC}, 0, 0, FLAGS, "lens_geometry" },
{ "equirectangular", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=LF_EQUIRECTANGULAR}, 0, 0, FLAGS, "lens_geometry" },
{ "fisheye_orthographic", "orthographic fisheye", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE_ORTHOGRAPHIC}, 0, 0, FLAGS, "lens_geometry" },
{ "fisheye_stereographic", "stereographic fisheye", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE_STEREOGRAPHIC}, 0, 0, FLAGS, "lens_geometry" },
{ "fisheye_equisolid", "equisolid fisheye", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE_EQUISOLID}, 0, 0, FLAGS, "lens_geometry" },
{ "fisheye_thoby", "fisheye as measured by thoby", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE_THOBY}, 0, 0, FLAGS, "lens_geometry" },
{ "reverse", "Does reverse correction (regular image to lens distorted)", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "interpolation", "Type of interpolation", OFFSET(interpolation_type), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, LANCZOS, FLAGS, "interpolation" },
{ "nearest", NULL, 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interpolation" },
{ "linear", NULL, 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "interpolation" },
{ "lanczos", NULL, 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interpolation" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(lensfun);
static av_cold int init(AVFilterContext *ctx)
{
LensfunContext *lensfun = ctx->priv;
lfDatabase *db;
const lfCamera **cameras;
const lfLens **lenses;
db = lf_db_create();
if (lf_db_load(db) != LF_NO_ERROR) {
lf_db_destroy(db);
av_log(ctx, AV_LOG_FATAL, "Failed to load lensfun database\n");
return AVERROR_INVALIDDATA;
}
if (!lensfun->make || !lensfun->model) {
const lfCamera *const *cameras = lf_db_get_cameras(db);
av_log(ctx, AV_LOG_FATAL, "Option \"make\" or option \"model\" not specified\n");
av_log(ctx, AV_LOG_INFO, "Available values for \"make\" and \"model\":\n");
for (int i = 0; cameras && cameras[i]; i++)
av_log(ctx, AV_LOG_INFO, "\t%s\t%s\n", cameras[i]->Maker, cameras[i]->Model);
lf_db_destroy(db);
return AVERROR(EINVAL);
} else if (!lensfun->lens_model) {
const lfLens *const *lenses = lf_db_get_lenses(db);
av_log(ctx, AV_LOG_FATAL, "Option \"lens_model\" not specified\n");
av_log(ctx, AV_LOG_INFO, "Available values for \"lens_model\":\n");
for (int i = 0; lenses && lenses[i]; i++)
av_log(ctx, AV_LOG_INFO, "\t%s\t(make %s)\n", lenses[i]->Model, lenses[i]->Maker);
lf_db_destroy(db);
return AVERROR(EINVAL);
}
lensfun->lens = lf_lens_create();
lensfun->camera = lf_camera_create();
cameras = lf_db_find_cameras(db, lensfun->make, lensfun->model);
if (cameras && *cameras) {
lf_camera_copy(lensfun->camera, *cameras);
av_log(ctx, AV_LOG_INFO, "Using camera %s\n", lensfun->camera->Model);
} else {
lf_free(cameras);
lf_db_destroy(db);
av_log(ctx, AV_LOG_FATAL, "Failed to find camera in lensfun database\n");
return AVERROR_INVALIDDATA;
}
lf_free(cameras);
lenses = lf_db_find_lenses(db, lensfun->camera, NULL, lensfun->lens_model, 0);
if (lenses && *lenses) {
lf_lens_copy(lensfun->lens, *lenses);
av_log(ctx, AV_LOG_INFO, "Using lens %s\n", lensfun->lens->Model);
} else {
lf_free(lenses);
lf_db_destroy(db);
av_log(ctx, AV_LOG_FATAL, "Failed to find lens in lensfun database\n");
return AVERROR_INVALIDDATA;
}
lf_free(lenses);
lf_db_destroy(db);
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
// Some of the functions provided by lensfun require pixels in RGB format
static const enum AVPixelFormat fmts[] = {AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE};
return ff_set_common_formats_from_list(ctx, fmts);
}
static float lanczos_kernel(float x)
{
if (x == 0.0f) {
return 1.0f;
} else if (x > -2.0f && x < 2.0f) {
return (2.0f * sin(M_PI * x) * sin(M_PI / 2.0f * x)) / (M_PI * M_PI * x * x);
} else {
return 0.0f;
}
}
static int config_props(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
LensfunContext *lensfun = ctx->priv;
int index;
float a;
if (!lensfun->modifier) {
if (lensfun->camera && lensfun->lens) {
lensfun->modifier = lf_modifier_create(lensfun->lens,
lensfun->focal_length,
lensfun->camera->CropFactor,
inlink->w,
inlink->h, LF_PF_U8, lensfun->reverse);
if (lensfun->mode & VIGNETTING)
lf_modifier_enable_vignetting_correction(lensfun->modifier, lensfun->aperture, lensfun->focus_distance);
if (lensfun->mode & GEOMETRY_DISTORTION) {
lf_modifier_enable_distortion_correction(lensfun->modifier);
lf_modifier_enable_projection_transform(lensfun->modifier, lensfun->target_geometry);
lf_modifier_enable_scaling(lensfun->modifier, lensfun->scale);
}
if (lensfun->mode & SUBPIXEL_DISTORTION)
lf_modifier_enable_tca_correction(lensfun->modifier);
} else {
// lensfun->camera and lensfun->lens should have been initialized
return AVERROR_BUG;
}
}
if (!lensfun->distortion_coords) {
if (lensfun->mode & SUBPIXEL_DISTORTION) {
lensfun->distortion_coords = av_malloc_array(inlink->w * inlink->h, sizeof(float) * 2 * 3);
if (!lensfun->distortion_coords)
return AVERROR(ENOMEM);
if (lensfun->mode & GEOMETRY_DISTORTION) {
// apply both geometry and subpixel distortion
lf_modifier_apply_subpixel_geometry_distortion(lensfun->modifier,
0, 0,
inlink->w, inlink->h,
lensfun->distortion_coords);
} else {
// apply only subpixel distortion
lf_modifier_apply_subpixel_distortion(lensfun->modifier,
0, 0,
inlink->w, inlink->h,
lensfun->distortion_coords);
}
} else if (lensfun->mode & GEOMETRY_DISTORTION) {
lensfun->distortion_coords = av_malloc_array(inlink->w * inlink->h, sizeof(float) * 2);
if (!lensfun->distortion_coords)
return AVERROR(ENOMEM);
// apply only geometry distortion
lf_modifier_apply_geometry_distortion(lensfun->modifier,
0, 0,
inlink->w, inlink->h,
lensfun->distortion_coords);
}
}
if (!lensfun->interpolation)
if (lensfun->interpolation_type == LANCZOS) {
lensfun->interpolation = av_malloc_array(LANCZOS_RESOLUTION, sizeof(float) * 4);
if (!lensfun->interpolation)
return AVERROR(ENOMEM);
for (index = 0; index < 4 * LANCZOS_RESOLUTION; ++index) {
if (index == 0) {
lensfun->interpolation[index] = 1.0f;
} else {
a = sqrtf((float)index / LANCZOS_RESOLUTION);
lensfun->interpolation[index] = lanczos_kernel(a);
}
}
}
return 0;
}
static int vignetting_filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
const VignettingThreadData *thread_data = arg;
const int slice_start = thread_data->height * jobnr / nb_jobs;
const int slice_end = thread_data->height * (jobnr + 1) / nb_jobs;
lf_modifier_apply_color_modification(thread_data->modifier,
thread_data->data_in + slice_start * thread_data->linesize_in,
0,
slice_start,
thread_data->width,
slice_end - slice_start,
thread_data->pixel_composition,
thread_data->linesize_in);
return 0;
}
static float square(float x)
{
return x * x;
}
static int distortion_correction_filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
const DistortionCorrectionThreadData *thread_data = arg;
const int slice_start = thread_data->height * jobnr / nb_jobs;
const int slice_end = thread_data->height * (jobnr + 1) / nb_jobs;
int x, y, i, j, rgb_index;
float interpolated, new_x, new_y, d, norm;
int new_x_int, new_y_int;
for (y = slice_start; y < slice_end; ++y)
for (x = 0; x < thread_data->width; ++x)
for (rgb_index = 0; rgb_index < 3; ++rgb_index) {
if (thread_data->mode & SUBPIXEL_DISTORTION) {
// subpixel (and possibly geometry) distortion correction was applied, correct distortion
switch(thread_data->interpolation_type) {
case NEAREST:
new_x_int = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2] + 0.5f;
new_y_int = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2 + 1] + 0.5f;
if (new_x_int < 0 || new_x_int >= thread_data->width || new_y_int < 0 || new_y_int >= thread_data->height) {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
} else {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = thread_data->data_in[new_x_int * 3 + rgb_index + new_y_int * thread_data->linesize_in];
}
break;
case LINEAR:
interpolated = 0.0f;
new_x = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2];
new_x_int = new_x;
new_y = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2 + 1];
new_y_int = new_y;
if (new_x_int < 0 || new_x_int + 1 >= thread_data->width || new_y_int < 0 || new_y_int + 1 >= thread_data->height) {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
} else {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] =
thread_data->data_in[ new_x_int * 3 + rgb_index + new_y_int * thread_data->linesize_in] * (new_x_int + 1 - new_x) * (new_y_int + 1 - new_y)
+ thread_data->data_in[(new_x_int + 1) * 3 + rgb_index + new_y_int * thread_data->linesize_in] * (new_x - new_x_int) * (new_y_int + 1 - new_y)
+ thread_data->data_in[ new_x_int * 3 + rgb_index + (new_y_int + 1) * thread_data->linesize_in] * (new_x_int + 1 - new_x) * (new_y - new_y_int)
+ thread_data->data_in[(new_x_int + 1) * 3 + rgb_index + (new_y_int + 1) * thread_data->linesize_in] * (new_x - new_x_int) * (new_y - new_y_int);
}
break;
case LANCZOS:
interpolated = 0.0f;
norm = 0.0f;
new_x = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2];
new_x_int = new_x;
new_y = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2 + 1];
new_y_int = new_y;
for (j = 0; j < 4; ++j)
for (i = 0; i < 4; ++i) {
if (new_x_int + i - 2 < 0 || new_x_int + i - 2 >= thread_data->width || new_y_int + j - 2 < 0 || new_y_int + j - 2 >= thread_data->height)
continue;
d = square(new_x - (new_x_int + i - 2)) * square(new_y - (new_y_int + j - 2));
if (d >= 4.0f)
continue;
d = thread_data->interpolation[(int)(d * LANCZOS_RESOLUTION)];
norm += d;
interpolated += thread_data->data_in[(new_x_int + i - 2) * 3 + rgb_index + (new_y_int + j - 2) * thread_data->linesize_in] * d;
}
if (norm == 0.0f) {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
} else {
interpolated /= norm;
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = interpolated < 0.0f ? 0.0f : interpolated > 255.0f ? 255.0f : interpolated;
}
break;
}
} else if (thread_data->mode & GEOMETRY_DISTORTION) {
// geometry distortion correction was applied, correct distortion
switch(thread_data->interpolation_type) {
case NEAREST:
new_x_int = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2] + 0.5f;
new_y_int = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2 + 1] + 0.5f;
if (new_x_int < 0 || new_x_int >= thread_data->width || new_y_int < 0 || new_y_int >= thread_data->height) {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
} else {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = thread_data->data_in[new_x_int * 3 + rgb_index + new_y_int * thread_data->linesize_in];
}
break;
case LINEAR:
interpolated = 0.0f;
new_x = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2];
new_x_int = new_x;
new_y = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2 + 1];
new_y_int = new_y;
if (new_x_int < 0 || new_x_int + 1 >= thread_data->width || new_y_int < 0 || new_y_int + 1 >= thread_data->height) {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
} else {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] =
thread_data->data_in[ new_x_int * 3 + rgb_index + new_y_int * thread_data->linesize_in] * (new_x_int + 1 - new_x) * (new_y_int + 1 - new_y)
+ thread_data->data_in[(new_x_int + 1) * 3 + rgb_index + new_y_int * thread_data->linesize_in] * (new_x - new_x_int) * (new_y_int + 1 - new_y)
+ thread_data->data_in[ new_x_int * 3 + rgb_index + (new_y_int + 1) * thread_data->linesize_in] * (new_x_int + 1 - new_x) * (new_y - new_y_int)
+ thread_data->data_in[(new_x_int + 1) * 3 + rgb_index + (new_y_int + 1) * thread_data->linesize_in] * (new_x - new_x_int) * (new_y - new_y_int);
}
break;
case LANCZOS:
interpolated = 0.0f;
norm = 0.0f;
new_x = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2];
new_x_int = new_x;
new_y = thread_data->distortion_coords[x * 2 + 1 + y * thread_data->width * 2];
new_y_int = new_y;
for (j = 0; j < 4; ++j)
for (i = 0; i < 4; ++i) {
if (new_x_int + i - 2 < 0 || new_x_int + i - 2 >= thread_data->width || new_y_int + j - 2 < 0 || new_y_int + j - 2 >= thread_data->height)
continue;
d = square(new_x - (new_x_int + i - 2)) * square(new_y - (new_y_int + j - 2));
if (d >= 4.0f)
continue;
d = thread_data->interpolation[(int)(d * LANCZOS_RESOLUTION)];
norm += d;
interpolated += thread_data->data_in[(new_x_int + i - 2) * 3 + rgb_index + (new_y_int + j - 2) * thread_data->linesize_in] * d;
}
if (norm == 0.0f) {
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
} else {
interpolated /= norm;
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = interpolated < 0.0f ? 0.0f : interpolated > 255.0f ? 255.0f : interpolated;
}
break;
}
} else {
// no distortion correction was applied
thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = thread_data->data_in[x * 3 + rgb_index + y * thread_data->linesize_in];
}
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
LensfunContext *lensfun = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
VignettingThreadData vignetting_thread_data;
DistortionCorrectionThreadData distortion_correction_thread_data;
if (lensfun->mode & VIGNETTING) {
av_frame_make_writable(in);
vignetting_thread_data = (VignettingThreadData) {
.width = inlink->w,
.height = inlink->h,
.data_in = in->data[0],
.linesize_in = in->linesize[0],
.pixel_composition = LF_CR_3(RED, GREEN, BLUE),
.modifier = lensfun->modifier
};
ff_filter_execute(ctx, vignetting_filter_slice,
&vignetting_thread_data, NULL,
FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
}
if (lensfun->mode & (GEOMETRY_DISTORTION | SUBPIXEL_DISTORTION)) {
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);
distortion_correction_thread_data = (DistortionCorrectionThreadData) {
.width = inlink->w,
.height = inlink->h,
.distortion_coords = lensfun->distortion_coords,
.data_in = in->data[0],
.data_out = out->data[0],
.linesize_in = in->linesize[0],
.linesize_out = out->linesize[0],
.interpolation = lensfun->interpolation,
.mode = lensfun->mode,
.interpolation_type = lensfun->interpolation_type
};
ff_filter_execute(ctx, distortion_correction_filter_slice,
&distortion_correction_thread_data, NULL,
FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
av_frame_free(&in);
return ff_filter_frame(outlink, out);
} else {
return ff_filter_frame(outlink, in);
}
}
static av_cold void uninit(AVFilterContext *ctx)
{
LensfunContext *lensfun = ctx->priv;
if (lensfun->camera)
lf_camera_destroy(lensfun->camera);
if (lensfun->lens)
lf_lens_destroy(lensfun->lens);
if (lensfun->modifier)
lf_modifier_destroy(lensfun->modifier);
av_freep(&lensfun->distortion_coords);
av_freep(&lensfun->interpolation);
}
static const AVFilterPad lensfun_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.filter_frame = filter_frame,
},
};
static const AVFilterPad lensfun_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_lensfun = {
.name = "lensfun",
.description = NULL_IF_CONFIG_SMALL("Apply correction to an image based on info derived from the lensfun database."),
.priv_size = sizeof(LensfunContext),
.init = init,
.uninit = uninit,
FILTER_INPUTS(lensfun_inputs),
FILTER_OUTPUTS(lensfun_outputs),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &lensfun_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
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