git.sesse.net Git - ffmpeg/blob - libavfilter/vf_lensfun.c

   1 /*
   2  * Copyright (C) 2007 by Andrew Zabolotny (author of lensfun, from which this filter derives from)
   3  * Copyright (C) 2018 Stephen Seo
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  */
  20
  21 /**
  22  * @file
  23  * Lensfun filter, applies lens correction with parameters from the lensfun database
  24  *
  25  * @see https://lensfun.sourceforge.net/
  26  */
  27
  28 #include <float.h>
  29 #include <math.h>
  30
  31 #include "libavutil/avassert.h"
  32 #include "libavutil/imgutils.h"
  33 #include "libavutil/opt.h"
  34 #include "libswscale/swscale.h"
  35 #include "avfilter.h"
  36 #include "formats.h"
  37 #include "internal.h"
  38 #include "video.h"
  39
  40 #include <lensfun.h>
  41
  42 #define LANCZOS_RESOLUTION 256
  43
  44 enum Mode {
  45     VIGNETTING = 0x1,
  46     GEOMETRY_DISTORTION = 0x2,
  47     SUBPIXEL_DISTORTION = 0x4
  48 };
  49
  50 enum InterpolationType {
  51     NEAREST,
  52     LINEAR,
  53     LANCZOS
  54 };
  55
  56 typedef struct VignettingThreadData {
  57     int width, height;
  58     uint8_t *data_in;
  59     int linesize_in;
  60     int pixel_composition;
  61     lfModifier *modifier;
  62 } VignettingThreadData;
  63
  64 typedef struct DistortionCorrectionThreadData {
  65     int width, height;
  66     const float *distortion_coords;
  67     const uint8_t *data_in;
  68     uint8_t *data_out;
  69     int linesize_in, linesize_out;
  70     const float *interpolation;
  71     int mode;
  72     int interpolation_type;
  73 } DistortionCorrectionThreadData;
  74
  75 typedef struct LensfunContext {
  76     const AVClass *class;
  77     const char *make, *model, *lens_model;
  78     int mode;
  79     float focal_length;
  80     float aperture;
  81     float focus_distance;
  82     int target_geometry;
  83     int reverse;
  84     int interpolation_type;
  85
  86     float *distortion_coords;
  87     float *interpolation;
  88
  89     lfLens *lens;
  90     lfCamera *camera;
  91     lfModifier *modifier;
  92 } LensfunContext;
  93
  94 #define OFFSET(x) offsetof(LensfunContext, x)
  95 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
  96 static const AVOption lensfun_options[] = {
  97     { "make", "set camera maker", OFFSET(make), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
  98     { "model", "set camera model", OFFSET(model), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
  99     { "lens_model", "set lens model", OFFSET(lens_model), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
 100     { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=GEOMETRY_DISTORTION}, 0, VIGNETTING | GEOMETRY_DISTORTION | SUBPIXEL_DISTORTION, FLAGS, "mode" },
 101         { "vignetting", "fix lens vignetting", 0, AV_OPT_TYPE_CONST, {.i64=VIGNETTING}, 0, 0, FLAGS, "mode" },
 102         { "geometry", "correct geometry distortion", 0, AV_OPT_TYPE_CONST, {.i64=GEOMETRY_DISTORTION}, 0, 0, FLAGS, "mode" },
 103         { "subpixel", "fix chromatic aberrations", 0, AV_OPT_TYPE_CONST, {.i64=SUBPIXEL_DISTORTION}, 0, 0, FLAGS, "mode" },
 104         { "vig_geo", "fix lens vignetting and correct geometry distortion", 0, AV_OPT_TYPE_CONST, {.i64=VIGNETTING | GEOMETRY_DISTORTION}, 0, 0, FLAGS, "mode" },
 105         { "vig_subpixel", "fix lens vignetting and chromatic aberrations", 0, AV_OPT_TYPE_CONST, {.i64=VIGNETTING | SUBPIXEL_DISTORTION}, 0, 0, FLAGS, "mode" },
 106         { "distortion", "correct geometry distortion and chromatic aberrations", 0, AV_OPT_TYPE_CONST, {.i64=GEOMETRY_DISTORTION | SUBPIXEL_DISTORTION}, 0, 0, FLAGS, "mode" },
 107         { "all", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VIGNETTING | GEOMETRY_DISTORTION | SUBPIXEL_DISTORTION}, 0, 0, FLAGS, "mode" },
 108     { "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 },
 109     { "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 },
 110     { "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 },
 111     { "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" },
 112         { "rectilinear", "rectilinear lens (default)", 0, AV_OPT_TYPE_CONST, {.i64=LF_RECTILINEAR}, 0, 0, FLAGS, "lens_geometry" },
 113         { "fisheye", "fisheye lens", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE}, 0, 0, FLAGS, "lens_geometry" },
 114         { "panoramic", "panoramic (cylindrical)", 0, AV_OPT_TYPE_CONST, {.i64=LF_PANORAMIC}, 0, 0, FLAGS, "lens_geometry" },
 115         { "equirectangular", "equirectangular", 0, AV_OPT_TYPE_CONST, {.i64=LF_EQUIRECTANGULAR}, 0, 0, FLAGS, "lens_geometry" },
 116         { "fisheye_orthographic", "orthographic fisheye", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE_ORTHOGRAPHIC}, 0, 0, FLAGS, "lens_geometry" },
 117         { "fisheye_stereographic", "stereographic fisheye", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE_STEREOGRAPHIC}, 0, 0, FLAGS, "lens_geometry" },
 118         { "fisheye_equisolid", "equisolid fisheye", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE_EQUISOLID}, 0, 0, FLAGS, "lens_geometry" },
 119         { "fisheye_thoby", "fisheye as measured by thoby", 0, AV_OPT_TYPE_CONST, {.i64=LF_FISHEYE_THOBY}, 0, 0, FLAGS, "lens_geometry" },
 120     { "reverse", "Does reverse correction (regular image to lens distorted)", OFFSET(reverse), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
 121     { "interpolation", "Type of interpolation", OFFSET(interpolation_type), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, LANCZOS, FLAGS, "interpolation" },
 122         { "nearest", NULL, 0, AV_OPT_TYPE_CONST, {.i64=NEAREST}, 0, 0, FLAGS, "interpolation" },
 123         { "linear", NULL, 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "interpolation" },
 124         { "lanczos", NULL, 0, AV_OPT_TYPE_CONST, {.i64=LANCZOS}, 0, 0, FLAGS, "interpolation" },
 125     { NULL }
 126 };
 127
 128 AVFILTER_DEFINE_CLASS(lensfun);
 129
 130 static av_cold int init(AVFilterContext *ctx)
 131 {
 132     LensfunContext *lensfun = ctx->priv;
 133     lfDatabase *db;
 134     const lfCamera **cameras;
 135     const lfLens **lenses;
 136
 137     if (!lensfun->make) {
 138         av_log(ctx, AV_LOG_FATAL, "Option \"make\" not specified\n");
 139         return AVERROR(EINVAL);
 140     } else if (!lensfun->model) {
 141         av_log(ctx, AV_LOG_FATAL, "Option \"model\" not specified\n");
 142         return AVERROR(EINVAL);
 143     } else if (!lensfun->lens_model) {
 144         av_log(ctx, AV_LOG_FATAL, "Option \"lens_model\" not specified\n");
 145         return AVERROR(EINVAL);
 146     }
 147
 148     lensfun->lens = lf_lens_new();
 149     lensfun->camera = lf_camera_new();
 150
 151     db = lf_db_new();
 152     if (lf_db_load(db) != LF_NO_ERROR) {
 153         lf_db_destroy(db);
 154         av_log(ctx, AV_LOG_FATAL, "Failed to load lensfun database\n");
 155         return AVERROR_INVALIDDATA;
 156     }
 157
 158     cameras = lf_db_find_cameras(db, lensfun->make, lensfun->model);
 159     if (cameras && *cameras) {
 160         lf_camera_copy(lensfun->camera, *cameras);
 161         av_log(ctx, AV_LOG_INFO, "Using camera %s\n", lensfun->camera->Model);
 162     } else {
 163         lf_free(cameras);
 164         lf_db_destroy(db);
 165         av_log(ctx, AV_LOG_FATAL, "Failed to find camera in lensfun database\n");
 166         return AVERROR_INVALIDDATA;
 167     }
 168     lf_free(cameras);
 169
 170     lenses = lf_db_find_lenses_hd(db, lensfun->camera, NULL, lensfun->lens_model, 0);
 171     if (lenses && *lenses) {
 172         lf_lens_copy(lensfun->lens, *lenses);
 173         av_log(ctx, AV_LOG_INFO, "Using lens %s\n", lensfun->lens->Model);
 174     } else {
 175         lf_free(lenses);
 176         lf_db_destroy(db);
 177         av_log(ctx, AV_LOG_FATAL, "Failed to find lens in lensfun database\n");
 178         return AVERROR_INVALIDDATA;
 179     }
 180     lf_free(lenses);
 181
 182     lf_db_destroy(db);
 183     return 0;
 184 }
 185
 186 static int query_formats(AVFilterContext *ctx)
 187 {
 188     // Some of the functions provided by lensfun require pixels in RGB format
 189     static const enum AVPixelFormat fmts[] = {AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE};
 190     AVFilterFormats *fmts_list = ff_make_format_list(fmts);
 191     return ff_set_common_formats(ctx, fmts_list);
 192 }
 193
 194 static float lanczos_kernel(float x)
 195 {
 196     if (x == 0.0f) {
 197         return 1.0f;
 198     } else if (x > -2.0f && x < 2.0f) {
 199         return (2.0f * sin(M_PI * x) * sin(M_PI / 2.0f * x)) / (M_PI * M_PI * x * x);
 200     } else {
 201         return 0.0f;
 202     }
 203 }
 204
 205 static int config_props(AVFilterLink *inlink)
 206 {
 207     AVFilterContext *ctx = inlink->dst;
 208     LensfunContext *lensfun = ctx->priv;
 209     int index;
 210     float a;
 211     int lensfun_mode = 0;
 212
 213     if (!lensfun->modifier) {
 214         if (lensfun->camera && lensfun->lens) {
 215             lensfun->modifier = lf_modifier_new(lensfun->lens,
 216                                                 lensfun->camera->CropFactor,
 217                                                 inlink->w,
 218                                                 inlink->h);
 219             if (lensfun->mode & VIGNETTING)
 220                 lensfun_mode |= LF_MODIFY_VIGNETTING;
 221             if (lensfun->mode & GEOMETRY_DISTORTION)
 222                 lensfun_mode |= LF_MODIFY_DISTORTION | LF_MODIFY_GEOMETRY | LF_MODIFY_SCALE;
 223             if (lensfun->mode & SUBPIXEL_DISTORTION)
 224                 lensfun_mode |= LF_MODIFY_TCA;
 225             lf_modifier_initialize(lensfun->modifier,
 226                                    lensfun->lens,
 227                                    LF_PF_U8,
 228                                    lensfun->focal_length,
 229                                    lensfun->aperture,
 230                                    lensfun->focus_distance,
 231                                    0.0,
 232                                    lensfun->target_geometry,
 233                                    lensfun_mode,
 234                                    lensfun->reverse);
 235         } else {
 236             // lensfun->camera and lensfun->lens should have been initialized
 237             return AVERROR_BUG;
 238         }
 239     }
 240
 241     if (!lensfun->distortion_coords) {
 242         if (lensfun->mode & SUBPIXEL_DISTORTION) {
 243             lensfun->distortion_coords = av_malloc_array(inlink->w * inlink->h, sizeof(float) * 2 * 3);
 244             if (!lensfun->distortion_coords)
 245                 return AVERROR(ENOMEM);
 246             if (lensfun->mode & GEOMETRY_DISTORTION) {
 247                 // apply both geometry and subpixel distortion
 248                 lf_modifier_apply_subpixel_geometry_distortion(lensfun->modifier,
 249                                                                0, 0,
 250                                                                inlink->w, inlink->h,
 251                                                                lensfun->distortion_coords);
 252             } else {
 253                 // apply only subpixel distortion
 254                 lf_modifier_apply_subpixel_distortion(lensfun->modifier,
 255                                                       0, 0,
 256                                                       inlink->w, inlink->h,
 257                                                       lensfun->distortion_coords);
 258             }
 259         } else if (lensfun->mode & GEOMETRY_DISTORTION) {
 260             lensfun->distortion_coords = av_malloc_array(inlink->w * inlink->h, sizeof(float) * 2);
 261             if (!lensfun->distortion_coords)
 262                 return AVERROR(ENOMEM);
 263             // apply only geometry distortion
 264             lf_modifier_apply_geometry_distortion(lensfun->modifier,
 265                                                   0, 0,
 266                                                   inlink->w, inlink->h,
 267                                                   lensfun->distortion_coords);
 268         }
 269     }
 270
 271     if (!lensfun->interpolation)
 272         if (lensfun->interpolation_type == LANCZOS) {
 273             lensfun->interpolation = av_malloc_array(LANCZOS_RESOLUTION, sizeof(float) * 4);
 274             if (!lensfun->interpolation)
 275                 return AVERROR(ENOMEM);
 276             for (index = 0; index < 4 * LANCZOS_RESOLUTION; ++index) {
 277                 if (index == 0) {
 278                     lensfun->interpolation[index] = 1.0f;
 279                 } else {
 280                     a = sqrtf((float)index / LANCZOS_RESOLUTION);
 281                     lensfun->interpolation[index] = lanczos_kernel(a);
 282                 }
 283             }
 284         }
 285
 286     return 0;
 287 }
 288
 289 static int vignetting_filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 290 {
 291     const VignettingThreadData *thread_data = arg;
 292     const int slice_start = thread_data->height *  jobnr      / nb_jobs;
 293     const int slice_end   = thread_data->height * (jobnr + 1) / nb_jobs;
 294
 295     lf_modifier_apply_color_modification(thread_data->modifier,
 296                                          thread_data->data_in + slice_start * thread_data->linesize_in,
 297                                          0,
 298                                          slice_start,
 299                                          thread_data->width,
 300                                          slice_end - slice_start,
 301                                          thread_data->pixel_composition,
 302                                          thread_data->linesize_in);
 303
 304     return 0;
 305 }
 306
 307 static float square(float x)
 308 {
 309     return x * x;
 310 }
 311
 312 static int distortion_correction_filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 313 {
 314     const DistortionCorrectionThreadData *thread_data = arg;
 315     const int slice_start = thread_data->height *  jobnr      / nb_jobs;
 316     const int slice_end   = thread_data->height * (jobnr + 1) / nb_jobs;
 317
 318     int x, y, i, j, rgb_index;
 319     float interpolated, new_x, new_y, d, norm;
 320     int new_x_int, new_y_int;
 321     for (y = slice_start; y < slice_end; ++y)
 322         for (x = 0; x < thread_data->width; ++x)
 323             for (rgb_index = 0; rgb_index < 3; ++rgb_index) {
 324                 if (thread_data->mode & SUBPIXEL_DISTORTION) {
 325                     // subpixel (and possibly geometry) distortion correction was applied, correct distortion
 326                     switch(thread_data->interpolation_type) {
 327                     case NEAREST:
 328                         new_x_int = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2]     + 0.5f;
 329                         new_y_int = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2 + 1] + 0.5f;
 330                         if (new_x_int < 0 || new_x_int >= thread_data->width || new_y_int < 0 || new_y_int >= thread_data->height) {
 331                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
 332                         } else {
 333                             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];
 334                         }
 335                         break;
 336                     case LINEAR:
 337                         interpolated = 0.0f;
 338                         new_x = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2];
 339                         new_x_int = new_x;
 340                         new_y = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2 + 1];
 341                         new_y_int = new_y;
 342                         if (new_x_int < 0 || new_x_int + 1 >= thread_data->width || new_y_int < 0 || new_y_int + 1 >= thread_data->height) {
 343                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
 344                         } else {
 345                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] =
 346                                   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)
 347                                 + 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)
 348                                 + 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)
 349                                 + 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);
 350                         }
 351                         break;
 352                     case LANCZOS:
 353                         interpolated = 0.0f;
 354                         norm = 0.0f;
 355                         new_x = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2];
 356                         new_x_int = new_x;
 357                         new_y = thread_data->distortion_coords[x * 2 * 3 + y * thread_data->width * 2 * 3 + rgb_index * 2 + 1];
 358                         new_y_int = new_y;
 359                         for (j = 0; j < 4; ++j)
 360                             for (i = 0; i < 4; ++i) {
 361                                 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)
 362                                     continue;
 363                                 d = square(new_x - (new_x_int + i - 2)) * square(new_y - (new_y_int + j - 2));
 364                                 if (d >= 4.0f)
 365                                     continue;
 366                                 d = thread_data->interpolation[(int)(d * LANCZOS_RESOLUTION)];
 367                                 norm += d;
 368                                 interpolated += thread_data->data_in[(new_x_int + i - 2) * 3 + rgb_index + (new_y_int + j - 2) * thread_data->linesize_in] * d;
 369                             }
 370                         if (norm == 0.0f) {
 371                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
 372                         } else {
 373                             interpolated /= norm;
 374                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = interpolated < 0.0f ? 0.0f : interpolated > 255.0f ? 255.0f : interpolated;
 375                         }
 376                         break;
 377                     }
 378                 } else if (thread_data->mode & GEOMETRY_DISTORTION) {
 379                     // geometry distortion correction was applied, correct distortion
 380                     switch(thread_data->interpolation_type) {
 381                     case NEAREST:
 382                         new_x_int = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2]     + 0.5f;
 383                         new_y_int = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2 + 1] + 0.5f;
 384                         if (new_x_int < 0 || new_x_int >= thread_data->width || new_y_int < 0 || new_y_int >= thread_data->height) {
 385                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
 386                         } else {
 387                             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];
 388                         }
 389                         break;
 390                     case LINEAR:
 391                         interpolated = 0.0f;
 392                         new_x = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2];
 393                         new_x_int = new_x;
 394                         new_y = thread_data->distortion_coords[x * 2 + y * thread_data->width * 2 + 1];
 395                         new_y_int = new_y;
 396                         if (new_x_int < 0 || new_x_int + 1 >= thread_data->width || new_y_int < 0 || new_y_int + 1 >= thread_data->height) {
 397                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
 398                         } else {
 399                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] =
 400                                   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)
 401                                 + 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)
 402                                 + 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)
 403                                 + 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);
 404                         }
 405                         break;
 406                     case LANCZOS:
 407                         interpolated = 0.0f;
 408                         norm = 0.0f;
 409                         new_x = thread_data->distortion_coords[x * 2     + y * thread_data->width * 2];
 410                         new_x_int = new_x;
 411                         new_y = thread_data->distortion_coords[x * 2 + 1 + y * thread_data->width * 2];
 412                         new_y_int = new_y;
 413                         for (j = 0; j < 4; ++j)
 414                             for (i = 0; i < 4; ++i) {
 415                                 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)
 416                                     continue;
 417                                 d = square(new_x - (new_x_int + i - 2)) * square(new_y - (new_y_int + j - 2));
 418                                 if (d >= 4.0f)
 419                                     continue;
 420                                 d = thread_data->interpolation[(int)(d * LANCZOS_RESOLUTION)];
 421                                 norm += d;
 422                                 interpolated += thread_data->data_in[(new_x_int + i - 2) * 3 + rgb_index + (new_y_int + j - 2) * thread_data->linesize_in] * d;
 423                             }
 424                         if (norm == 0.0f) {
 425                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = 0;
 426                         } else {
 427                             interpolated /= norm;
 428                             thread_data->data_out[x * 3 + rgb_index + y * thread_data->linesize_out] = interpolated < 0.0f ? 0.0f : interpolated > 255.0f ? 255.0f : interpolated;
 429                         }
 430                         break;
 431                     }
 432                 } else {
 433                     // no distortion correction was applied
 434                     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];
 435                 }
 436             }
 437
 438     return 0;
 439 }
 440
 441 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 442 {
 443     AVFilterContext *ctx = inlink->dst;
 444     LensfunContext *lensfun = ctx->priv;
 445     AVFilterLink *outlink = ctx->outputs[0];
 446     AVFrame *out;
 447     VignettingThreadData vignetting_thread_data;
 448     DistortionCorrectionThreadData distortion_correction_thread_data;
 449
 450     if (lensfun->mode & VIGNETTING) {
 451         av_frame_make_writable(in);
 452
 453         vignetting_thread_data = (VignettingThreadData) {
 454             .width = inlink->w,
 455             .height = inlink->h,
 456             .data_in = in->data[0],
 457             .linesize_in = in->linesize[0],
 458             .pixel_composition = LF_CR_3(RED, GREEN, BLUE),
 459             .modifier = lensfun->modifier
 460         };
 461
 462         ctx->internal->execute(ctx,
 463                                vignetting_filter_slice,
 464                                &vignetting_thread_data,
 465                                NULL,
 466                                FFMIN(outlink->h, ctx->graph->nb_threads));
 467     }
 468
 469     if (lensfun->mode & (GEOMETRY_DISTORTION | SUBPIXEL_DISTORTION)) {
 470         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 471         if (!out) {
 472             av_frame_free(&in);
 473             return AVERROR(ENOMEM);
 474         }
 475         av_frame_copy_props(out, in);
 476
 477         distortion_correction_thread_data = (DistortionCorrectionThreadData) {
 478             .width = inlink->w,
 479             .height = inlink->h,
 480             .distortion_coords = lensfun->distortion_coords,
 481             .data_in = in->data[0],
 482             .data_out = out->data[0],
 483             .linesize_in = in->linesize[0],
 484             .linesize_out = out->linesize[0],
 485             .interpolation = lensfun->interpolation,
 486             .mode = lensfun->mode,
 487             .interpolation_type = lensfun->interpolation_type
 488         };
 489
 490         ctx->internal->execute(ctx,
 491                                distortion_correction_filter_slice,
 492                                &distortion_correction_thread_data,
 493                                NULL,
 494                                FFMIN(outlink->h, ctx->graph->nb_threads));
 495
 496         av_frame_free(&in);
 497         return ff_filter_frame(outlink, out);
 498     } else {
 499         return ff_filter_frame(outlink, in);
 500     }
 501 }
 502
 503 static av_cold void uninit(AVFilterContext *ctx)
 504 {
 505     LensfunContext *lensfun = ctx->priv;
 506
 507     if (lensfun->camera)
 508         lf_camera_destroy(lensfun->camera);
 509     if (lensfun->lens)
 510         lf_lens_destroy(lensfun->lens);
 511     if (lensfun->modifier)
 512         lf_modifier_destroy(lensfun->modifier);
 513     av_freep(&lensfun->distortion_coords);
 514     av_freep(&lensfun->interpolation);
 515 }
 516
 517 static const AVFilterPad lensfun_inputs[] = {
 518     {
 519         .name         = "default",
 520         .type         = AVMEDIA_TYPE_VIDEO,
 521         .config_props = config_props,
 522         .filter_frame = filter_frame,
 523     },
 524     { NULL }
 525 };
 526
 527 static const AVFilterPad lensfun_outputs[] = {
 528     {
 529         .name = "default",
 530         .type = AVMEDIA_TYPE_VIDEO,
 531     },
 532     { NULL }
 533 };
 534
 535 AVFilter ff_vf_lensfun = {
 536     .name          = "lensfun",
 537     .description   = NULL_IF_CONFIG_SMALL("Apply correction to an image based on info derived from the lensfun database."),
 538     .priv_size     = sizeof(LensfunContext),
 539     .init          = init,
 540     .uninit        = uninit,
 541     .query_formats = query_formats,
 542     .inputs        = lensfun_inputs,
 543     .outputs       = lensfun_outputs,
 544     .priv_class    = &lensfun_class,
 545     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
 546 };