FFmpeg
vf_curves.c
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1 /*
2  * Copyright (c) 2013 Clément Bœsch
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/opt.h"
22 #include "libavutil/bprint.h"
23 #include "libavutil/eval.h"
24 #include "libavutil/file.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/avassert.h"
27 #include "libavutil/pixdesc.h"
28 #include "avfilter.h"
29 #include "drawutils.h"
30 #include "formats.h"
31 #include "internal.h"
32 #include "video.h"
33 
34 #define R 0
35 #define G 1
36 #define B 2
37 #define A 3
38 
39 struct keypoint {
40  double x, y;
41  struct keypoint *next;
42 };
43 
44 #define NB_COMP 3
45 
46 enum preset {
59 };
60 
61 typedef struct CurvesContext {
62  const AVClass *class;
63  int preset;
64  char *comp_points_str[NB_COMP + 1];
66  uint16_t *graph[NB_COMP + 1];
67  int lut_size;
68  char *psfile;
69  uint8_t rgba_map[4];
70  int step;
72  int is_16bit;
73  int depth;
74 
75  int (*filter_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
77 
78 typedef struct ThreadData {
79  AVFrame *in, *out;
80 } ThreadData;
81 
82 #define OFFSET(x) offsetof(CurvesContext, x)
83 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
84 static const AVOption curves_options[] = {
85  { "preset", "select a color curves preset", OFFSET(preset), AV_OPT_TYPE_INT, {.i64=PRESET_NONE}, PRESET_NONE, NB_PRESETS-1, FLAGS, "preset_name" },
86  { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NONE}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
87  { "color_negative", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_COLOR_NEGATIVE}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
88  { "cross_process", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_CROSS_PROCESS}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
89  { "darker", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_DARKER}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
90  { "increase_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_INCREASE_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
91  { "lighter", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LIGHTER}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
92  { "linear_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LINEAR_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
93  { "medium_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_MEDIUM_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
94  { "negative", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NEGATIVE}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
95  { "strong_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_STRONG_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
96  { "vintage", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_VINTAGE}, INT_MIN, INT_MAX, FLAGS, "preset_name" },
97  { "master","set master points coordinates",OFFSET(comp_points_str[NB_COMP]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
98  { "m", "set master points coordinates",OFFSET(comp_points_str[NB_COMP]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
99  { "red", "set red points coordinates", OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
100  { "r", "set red points coordinates", OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
101  { "green", "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
102  { "g", "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
103  { "blue", "set blue points coordinates", OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
104  { "b", "set blue points coordinates", OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
105  { "all", "set points coordinates for all components", OFFSET(comp_points_str_all), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
106  { "psfile", "set Photoshop curves file name", OFFSET(psfile), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
107  { "plot", "save Gnuplot script of the curves in specified file", OFFSET(plot_filename), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
108  { NULL }
109 };
110 
111 AVFILTER_DEFINE_CLASS(curves);
112 
113 static const struct {
114  const char *r;
115  const char *g;
116  const char *b;
117  const char *master;
118 } curves_presets[] = {
120  "0.129/1 0.466/0.498 0.725/0",
121  "0.109/1 0.301/0.498 0.517/0",
122  "0.098/1 0.235/0.498 0.423/0",
123  },
125  "0/0 0.25/0.156 0.501/0.501 0.686/0.745 1/1",
126  "0/0 0.25/0.188 0.38/0.501 0.745/0.815 1/0.815",
127  "0/0 0.231/0.094 0.709/0.874 1/1",
128  },
129  [PRESET_DARKER] = { .master = "0/0 0.5/0.4 1/1" },
130  [PRESET_INCREASE_CONTRAST] = { .master = "0/0 0.149/0.066 0.831/0.905 0.905/0.98 1/1" },
131  [PRESET_LIGHTER] = { .master = "0/0 0.4/0.5 1/1" },
132  [PRESET_LINEAR_CONTRAST] = { .master = "0/0 0.305/0.286 0.694/0.713 1/1" },
133  [PRESET_MEDIUM_CONTRAST] = { .master = "0/0 0.286/0.219 0.639/0.643 1/1" },
134  [PRESET_NEGATIVE] = { .master = "0/1 1/0" },
135  [PRESET_STRONG_CONTRAST] = { .master = "0/0 0.301/0.196 0.592/0.6 0.686/0.737 1/1" },
136  [PRESET_VINTAGE] = {
137  "0/0.11 0.42/0.51 1/0.95",
138  "0/0 0.50/0.48 1/1",
139  "0/0.22 0.49/0.44 1/0.8",
140  }
141 };
142 
143 static struct keypoint *make_point(double x, double y, struct keypoint *next)
144 {
145  struct keypoint *point = av_mallocz(sizeof(*point));
146 
147  if (!point)
148  return NULL;
149  point->x = x;
150  point->y = y;
151  point->next = next;
152  return point;
153 }
154 
155 static int parse_points_str(AVFilterContext *ctx, struct keypoint **points, const char *s,
156  int lut_size)
157 {
158  char *p = (char *)s; // strtod won't alter the string
159  struct keypoint *last = NULL;
160  const int scale = lut_size - 1;
161 
162  /* construct a linked list based on the key points string */
163  while (p && *p) {
164  struct keypoint *point = make_point(0, 0, NULL);
165  if (!point)
166  return AVERROR(ENOMEM);
167  point->x = av_strtod(p, &p); if (p && *p) p++;
168  point->y = av_strtod(p, &p); if (p && *p) p++;
169  if (point->x < 0 || point->x > 1 || point->y < 0 || point->y > 1) {
170  av_log(ctx, AV_LOG_ERROR, "Invalid key point coordinates (%f;%f), "
171  "x and y must be in the [0;1] range.\n", point->x, point->y);
172  return AVERROR(EINVAL);
173  }
174  if (!*points)
175  *points = point;
176  if (last) {
177  if ((int)(last->x * scale) >= (int)(point->x * scale)) {
178  av_log(ctx, AV_LOG_ERROR, "Key point coordinates (%f;%f) "
179  "and (%f;%f) are too close from each other or not "
180  "strictly increasing on the x-axis\n",
181  last->x, last->y, point->x, point->y);
182  return AVERROR(EINVAL);
183  }
184  last->next = point;
185  }
186  last = point;
187  }
188 
189  if (*points && !(*points)->next) {
190  av_log(ctx, AV_LOG_WARNING, "Only one point (at (%f;%f)) is defined, "
191  "this is unlikely to behave as you expect. You probably want"
192  "at least 2 points.",
193  (*points)->x, (*points)->y);
194  }
195 
196  return 0;
197 }
198 
199 static int get_nb_points(const struct keypoint *d)
200 {
201  int n = 0;
202  while (d) {
203  n++;
204  d = d->next;
205  }
206  return n;
207 }
208 
209 /**
210  * Natural cubic spline interpolation
211  * Finding curves using Cubic Splines notes by Steven Rauch and John Stockie.
212  * @see http://people.math.sfu.ca/~stockie/teaching/macm316/notes/splines.pdf
213  */
214 
215 #define CLIP(v) (nbits == 8 ? av_clip_uint8(v) : av_clip_uintp2_c(v, nbits))
216 
217 static inline int interpolate(void *log_ctx, uint16_t *y,
218  const struct keypoint *points, int nbits)
219 {
220  int i, ret = 0;
221  const struct keypoint *point = points;
222  double xprev = 0;
223  const int lut_size = 1<<nbits;
224  const int scale = lut_size - 1;
225 
226  double (*matrix)[3];
227  double *h, *r;
228  const int n = get_nb_points(points); // number of splines
229 
230  if (n == 0) {
231  for (i = 0; i < lut_size; i++)
232  y[i] = i;
233  return 0;
234  }
235 
236  if (n == 1) {
237  for (i = 0; i < lut_size; i++)
238  y[i] = CLIP(point->y * scale);
239  return 0;
240  }
241 
242  matrix = av_calloc(n, sizeof(*matrix));
243  h = av_malloc((n - 1) * sizeof(*h));
244  r = av_calloc(n, sizeof(*r));
245 
246  if (!matrix || !h || !r) {
247  ret = AVERROR(ENOMEM);
248  goto end;
249  }
250 
251  /* h(i) = x(i+1) - x(i) */
252  i = -1;
253  for (point = points; point; point = point->next) {
254  if (i != -1)
255  h[i] = point->x - xprev;
256  xprev = point->x;
257  i++;
258  }
259 
260  /* right-side of the polynomials, will be modified to contains the solution */
261  point = points;
262  for (i = 1; i < n - 1; i++) {
263  const double yp = point->y;
264  const double yc = point->next->y;
265  const double yn = point->next->next->y;
266  r[i] = 6 * ((yn-yc)/h[i] - (yc-yp)/h[i-1]);
267  point = point->next;
268  }
269 
270 #define BD 0 /* sub diagonal (below main) */
271 #define MD 1 /* main diagonal (center) */
272 #define AD 2 /* sup diagonal (above main) */
273 
274  /* left side of the polynomials into a tridiagonal matrix. */
275  matrix[0][MD] = matrix[n - 1][MD] = 1;
276  for (i = 1; i < n - 1; i++) {
277  matrix[i][BD] = h[i-1];
278  matrix[i][MD] = 2 * (h[i-1] + h[i]);
279  matrix[i][AD] = h[i];
280  }
281 
282  /* tridiagonal solving of the linear system */
283  for (i = 1; i < n; i++) {
284  const double den = matrix[i][MD] - matrix[i][BD] * matrix[i-1][AD];
285  const double k = den ? 1./den : 1.;
286  matrix[i][AD] *= k;
287  r[i] = (r[i] - matrix[i][BD] * r[i - 1]) * k;
288  }
289  for (i = n - 2; i >= 0; i--)
290  r[i] = r[i] - matrix[i][AD] * r[i + 1];
291 
292  point = points;
293 
294  /* left padding */
295  for (i = 0; i < (int)(point->x * scale); i++)
296  y[i] = CLIP(point->y * scale);
297 
298  /* compute the graph with x=[x0..xN] */
299  i = 0;
300  av_assert0(point->next); // always at least 2 key points
301  while (point->next) {
302  const double yc = point->y;
303  const double yn = point->next->y;
304 
305  const double a = yc;
306  const double b = (yn-yc)/h[i] - h[i]*r[i]/2. - h[i]*(r[i+1]-r[i])/6.;
307  const double c = r[i] / 2.;
308  const double d = (r[i+1] - r[i]) / (6.*h[i]);
309 
310  int x;
311  const int x_start = point->x * scale;
312  const int x_end = point->next->x * scale;
313 
314  av_assert0(x_start >= 0 && x_start < lut_size &&
315  x_end >= 0 && x_end < lut_size);
316 
317  for (x = x_start; x <= x_end; x++) {
318  const double xx = (x - x_start) * 1./scale;
319  const double yy = a + b*xx + c*xx*xx + d*xx*xx*xx;
320  y[x] = CLIP(yy * scale);
321  av_log(log_ctx, AV_LOG_DEBUG, "f(%f)=%f -> y[%d]=%d\n", xx, yy, x, y[x]);
322  }
323 
324  point = point->next;
325  i++;
326  }
327 
328  /* right padding */
329  for (i = (int)(point->x * scale); i < lut_size; i++)
330  y[i] = CLIP(point->y * scale);
331 
332 end:
333  av_free(matrix);
334  av_free(h);
335  av_free(r);
336  return ret;
337 }
338 
339 #define DECLARE_INTERPOLATE_FUNC(nbits) \
340 static int interpolate##nbits(void *log_ctx, uint16_t *y, \
341  const struct keypoint *points) \
342 { \
343  return interpolate(log_ctx, y, points, nbits); \
344 }
345 
352 
353 static int parse_psfile(AVFilterContext *ctx, const char *fname)
354 {
355  CurvesContext *curves = ctx->priv;
356  uint8_t *buf;
357  size_t size;
358  int i, ret, av_unused(version), nb_curves;
359  AVBPrint ptstr;
360  static const int comp_ids[] = {3, 0, 1, 2};
361 
363 
364  ret = av_file_map(fname, &buf, &size, 0, NULL);
365  if (ret < 0)
366  return ret;
367 
368 #define READ16(dst) do { \
369  if (size < 2) { \
370  ret = AVERROR_INVALIDDATA; \
371  goto end; \
372  } \
373  dst = AV_RB16(buf); \
374  buf += 2; \
375  size -= 2; \
376 } while (0)
377 
378  READ16(version);
379  READ16(nb_curves);
380  for (i = 0; i < FFMIN(nb_curves, FF_ARRAY_ELEMS(comp_ids)); i++) {
381  int nb_points, n;
382  av_bprint_clear(&ptstr);
383  READ16(nb_points);
384  for (n = 0; n < nb_points; n++) {
385  int y, x;
386  READ16(y);
387  READ16(x);
388  av_bprintf(&ptstr, "%f/%f ", x / 255., y / 255.);
389  }
390  if (*ptstr.str) {
391  char **pts = &curves->comp_points_str[comp_ids[i]];
392  if (!*pts) {
393  *pts = av_strdup(ptstr.str);
394  av_log(ctx, AV_LOG_DEBUG, "curves %d (intid=%d) [%d points]: [%s]\n",
395  i, comp_ids[i], nb_points, *pts);
396  if (!*pts) {
397  ret = AVERROR(ENOMEM);
398  goto end;
399  }
400  }
401  }
402  }
403 end:
404  av_bprint_finalize(&ptstr, NULL);
405  av_file_unmap(buf, size);
406  return ret;
407 }
408 
409 static int dump_curves(const char *fname, uint16_t *graph[NB_COMP + 1],
410  struct keypoint *comp_points[NB_COMP + 1],
411  int lut_size)
412 {
413  int i;
414  AVBPrint buf;
415  const double scale = 1. / (lut_size - 1);
416  static const char * const colors[] = { "red", "green", "blue", "#404040", };
417  FILE *f = av_fopen_utf8(fname, "w");
418 
419  av_assert0(FF_ARRAY_ELEMS(colors) == NB_COMP + 1);
420 
421  if (!f) {
422  int ret = AVERROR(errno);
423  av_log(NULL, AV_LOG_ERROR, "Cannot open file '%s' for writing: %s\n",
424  fname, av_err2str(ret));
425  return ret;
426  }
427 
429 
430  av_bprintf(&buf, "set xtics 0.1\n");
431  av_bprintf(&buf, "set ytics 0.1\n");
432  av_bprintf(&buf, "set size square\n");
433  av_bprintf(&buf, "set grid\n");
434 
435  for (i = 0; i < FF_ARRAY_ELEMS(colors); i++) {
436  av_bprintf(&buf, "%s'-' using 1:2 with lines lc '%s' title ''",
437  i ? ", " : "plot ", colors[i]);
438  if (comp_points[i])
439  av_bprintf(&buf, ", '-' using 1:2 with points pointtype 3 lc '%s' title ''",
440  colors[i]);
441  }
442  av_bprintf(&buf, "\n");
443 
444  for (i = 0; i < FF_ARRAY_ELEMS(colors); i++) {
445  int x;
446 
447  /* plot generated values */
448  for (x = 0; x < lut_size; x++)
449  av_bprintf(&buf, "%f %f\n", x * scale, graph[i][x] * scale);
450  av_bprintf(&buf, "e\n");
451 
452  /* plot user knots */
453  if (comp_points[i]) {
454  const struct keypoint *point = comp_points[i];
455 
456  while (point) {
457  av_bprintf(&buf, "%f %f\n", point->x, point->y);
458  point = point->next;
459  }
460  av_bprintf(&buf, "e\n");
461  }
462  }
463 
464  fwrite(buf.str, 1, buf.len, f);
465  fclose(f);
466  av_bprint_finalize(&buf, NULL);
467  return 0;
468 }
469 
471 {
472  int i, ret;
473  CurvesContext *curves = ctx->priv;
474  char **pts = curves->comp_points_str;
475  const char *allp = curves->comp_points_str_all;
476 
477  //if (!allp && curves->preset != PRESET_NONE && curves_presets[curves->preset].all)
478  // allp = curves_presets[curves->preset].all;
479 
480  if (allp) {
481  for (i = 0; i < NB_COMP; i++) {
482  if (!pts[i])
483  pts[i] = av_strdup(allp);
484  if (!pts[i])
485  return AVERROR(ENOMEM);
486  }
487  }
488 
489  if (curves->psfile) {
490  ret = parse_psfile(ctx, curves->psfile);
491  if (ret < 0)
492  return ret;
493  }
494 
495  if (curves->preset != PRESET_NONE) {
496 #define SET_COMP_IF_NOT_SET(n, name) do { \
497  if (!pts[n] && curves_presets[curves->preset].name) { \
498  pts[n] = av_strdup(curves_presets[curves->preset].name); \
499  if (!pts[n]) \
500  return AVERROR(ENOMEM); \
501  } \
502 } while (0)
507  }
508 
509  return 0;
510 }
511 
513 {
514  static const enum AVPixelFormat pix_fmts[] = {
529  };
530  AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
531  if (!fmts_list)
532  return AVERROR(ENOMEM);
533  return ff_set_common_formats(ctx, fmts_list);
534 }
535 
536 static int filter_slice_packed(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
537 {
538  int x, y;
539  const CurvesContext *curves = ctx->priv;
540  const ThreadData *td = arg;
541  const AVFrame *in = td->in;
542  const AVFrame *out = td->out;
543  const int direct = out == in;
544  const int step = curves->step;
545  const uint8_t r = curves->rgba_map[R];
546  const uint8_t g = curves->rgba_map[G];
547  const uint8_t b = curves->rgba_map[B];
548  const uint8_t a = curves->rgba_map[A];
549  const int slice_start = (in->height * jobnr ) / nb_jobs;
550  const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
551 
552  if (curves->is_16bit) {
553  for (y = slice_start; y < slice_end; y++) {
554  uint16_t *dstp = ( uint16_t *)(out->data[0] + y * out->linesize[0]);
555  const uint16_t *srcp = (const uint16_t *)(in ->data[0] + y * in->linesize[0]);
556 
557  for (x = 0; x < in->width * step; x += step) {
558  dstp[x + r] = curves->graph[R][srcp[x + r]];
559  dstp[x + g] = curves->graph[G][srcp[x + g]];
560  dstp[x + b] = curves->graph[B][srcp[x + b]];
561  if (!direct && step == 4)
562  dstp[x + a] = srcp[x + a];
563  }
564  }
565  } else {
566  uint8_t *dst = out->data[0] + slice_start * out->linesize[0];
567  const uint8_t *src = in->data[0] + slice_start * in->linesize[0];
568 
569  for (y = slice_start; y < slice_end; y++) {
570  for (x = 0; x < in->width * step; x += step) {
571  dst[x + r] = curves->graph[R][src[x + r]];
572  dst[x + g] = curves->graph[G][src[x + g]];
573  dst[x + b] = curves->graph[B][src[x + b]];
574  if (!direct && step == 4)
575  dst[x + a] = src[x + a];
576  }
577  dst += out->linesize[0];
578  src += in ->linesize[0];
579  }
580  }
581  return 0;
582 }
583 
584 static int filter_slice_planar(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
585 {
586  int x, y;
587  const CurvesContext *curves = ctx->priv;
588  const ThreadData *td = arg;
589  const AVFrame *in = td->in;
590  const AVFrame *out = td->out;
591  const int direct = out == in;
592  const int step = curves->step;
593  const uint8_t r = curves->rgba_map[R];
594  const uint8_t g = curves->rgba_map[G];
595  const uint8_t b = curves->rgba_map[B];
596  const uint8_t a = curves->rgba_map[A];
597  const int slice_start = (in->height * jobnr ) / nb_jobs;
598  const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
599 
600  if (curves->is_16bit) {
601  for (y = slice_start; y < slice_end; y++) {
602  uint16_t *dstrp = ( uint16_t *)(out->data[r] + y * out->linesize[r]);
603  uint16_t *dstgp = ( uint16_t *)(out->data[g] + y * out->linesize[g]);
604  uint16_t *dstbp = ( uint16_t *)(out->data[b] + y * out->linesize[b]);
605  uint16_t *dstap = ( uint16_t *)(out->data[a] + y * out->linesize[a]);
606  const uint16_t *srcrp = (const uint16_t *)(in ->data[r] + y * in->linesize[r]);
607  const uint16_t *srcgp = (const uint16_t *)(in ->data[g] + y * in->linesize[g]);
608  const uint16_t *srcbp = (const uint16_t *)(in ->data[b] + y * in->linesize[b]);
609  const uint16_t *srcap = (const uint16_t *)(in ->data[a] + y * in->linesize[a]);
610 
611  for (x = 0; x < in->width; x++) {
612  dstrp[x] = curves->graph[R][srcrp[x]];
613  dstgp[x] = curves->graph[G][srcgp[x]];
614  dstbp[x] = curves->graph[B][srcbp[x]];
615  if (!direct && step == 4)
616  dstap[x] = srcap[x];
617  }
618  }
619  } else {
620  uint8_t *dstr = out->data[r] + slice_start * out->linesize[r];
621  uint8_t *dstg = out->data[g] + slice_start * out->linesize[g];
622  uint8_t *dstb = out->data[b] + slice_start * out->linesize[b];
623  uint8_t *dsta = out->data[a] + slice_start * out->linesize[a];
624  const uint8_t *srcr = in->data[r] + slice_start * in->linesize[r];
625  const uint8_t *srcg = in->data[g] + slice_start * in->linesize[g];
626  const uint8_t *srcb = in->data[b] + slice_start * in->linesize[b];
627  const uint8_t *srca = in->data[a] + slice_start * in->linesize[a];
628 
629  for (y = slice_start; y < slice_end; y++) {
630  for (x = 0; x < in->width; x++) {
631  dstr[x] = curves->graph[R][srcr[x]];
632  dstg[x] = curves->graph[G][srcg[x]];
633  dstb[x] = curves->graph[B][srcb[x]];
634  if (!direct && step == 4)
635  dsta[x] = srca[x];
636  }
637  dstr += out->linesize[r];
638  dstg += out->linesize[g];
639  dstb += out->linesize[b];
640  dsta += out->linesize[a];
641  srcr += in ->linesize[r];
642  srcg += in ->linesize[g];
643  srcb += in ->linesize[b];
644  srca += in ->linesize[a];
645  }
646  }
647  return 0;
648 }
649 
651 {
652  int i, j, ret;
653  AVFilterContext *ctx = inlink->dst;
654  CurvesContext *curves = ctx->priv;
656  char **pts = curves->comp_points_str;
657  struct keypoint *comp_points[NB_COMP + 1] = {0};
658 
659  ff_fill_rgba_map(curves->rgba_map, inlink->format);
660  curves->is_16bit = desc->comp[0].depth > 8;
661  curves->depth = desc->comp[0].depth;
662  curves->lut_size = 1 << curves->depth;
663  curves->step = av_get_padded_bits_per_pixel(desc) >> (3 + curves->is_16bit);
665 
666  for (i = 0; i < NB_COMP + 1; i++) {
667  curves->graph[i] = av_mallocz_array(curves->lut_size, sizeof(*curves->graph[0]));
668  if (!curves->graph[i])
669  return AVERROR(ENOMEM);
670  ret = parse_points_str(ctx, comp_points + i, curves->comp_points_str[i], curves->lut_size);
671  if (ret < 0)
672  return ret;
673  switch (curves->depth) {
674  case 8: ret = interpolate8 (ctx, curves->graph[i], comp_points[i]); break;
675  case 9: ret = interpolate9 (ctx, curves->graph[i], comp_points[i]); break;
676  case 10: ret = interpolate10(ctx, curves->graph[i], comp_points[i]); break;
677  case 12: ret = interpolate12(ctx, curves->graph[i], comp_points[i]); break;
678  case 14: ret = interpolate14(ctx, curves->graph[i], comp_points[i]); break;
679  case 16: ret = interpolate16(ctx, curves->graph[i], comp_points[i]); break;
680  }
681  if (ret < 0)
682  return ret;
683  }
684 
685  if (pts[NB_COMP]) {
686  for (i = 0; i < NB_COMP; i++)
687  for (j = 0; j < curves->lut_size; j++)
688  curves->graph[i][j] = curves->graph[NB_COMP][curves->graph[i][j]];
689  }
690 
691  if (av_log_get_level() >= AV_LOG_VERBOSE) {
692  for (i = 0; i < NB_COMP; i++) {
693  const struct keypoint *point = comp_points[i];
694  av_log(ctx, AV_LOG_VERBOSE, "#%d points:", i);
695  while (point) {
696  av_log(ctx, AV_LOG_VERBOSE, " (%f;%f)", point->x, point->y);
697  point = point->next;
698  }
699  }
700  }
701 
702  if (curves->plot_filename)
703  dump_curves(curves->plot_filename, curves->graph, comp_points, curves->lut_size);
704 
705  for (i = 0; i < NB_COMP + 1; i++) {
706  struct keypoint *point = comp_points[i];
707  while (point) {
708  struct keypoint *next = point->next;
709  av_free(point);
710  point = next;
711  }
712  }
713 
714  return 0;
715 }
716 
718 {
719  AVFilterContext *ctx = inlink->dst;
720  CurvesContext *curves = ctx->priv;
721  AVFilterLink *outlink = ctx->outputs[0];
722  AVFrame *out;
723  ThreadData td;
724 
725  if (av_frame_is_writable(in)) {
726  out = in;
727  } else {
728  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
729  if (!out) {
730  av_frame_free(&in);
731  return AVERROR(ENOMEM);
732  }
733  av_frame_copy_props(out, in);
734  }
735 
736  td.in = in;
737  td.out = out;
738  ctx->internal->execute(ctx, curves->filter_slice, &td, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
739 
740  if (out != in)
741  av_frame_free(&in);
742 
743  return ff_filter_frame(outlink, out);
744 }
745 
747 {
748  int i;
749  CurvesContext *curves = ctx->priv;
750 
751  for (i = 0; i < NB_COMP + 1; i++)
752  av_freep(&curves->graph[i]);
753 }
754 
755 static const AVFilterPad curves_inputs[] = {
756  {
757  .name = "default",
758  .type = AVMEDIA_TYPE_VIDEO,
759  .filter_frame = filter_frame,
760  .config_props = config_input,
761  },
762  { NULL }
763 };
764 
765 static const AVFilterPad curves_outputs[] = {
766  {
767  .name = "default",
768  .type = AVMEDIA_TYPE_VIDEO,
769  },
770  { NULL }
771 };
772 
774  .name = "curves",
775  .description = NULL_IF_CONFIG_SMALL("Adjust components curves."),
776  .priv_size = sizeof(CurvesContext),
777  .init = curves_init,
780  .inputs = curves_inputs,
781  .outputs = curves_outputs,
782  .priv_class = &curves_class,
784 };
#define MD
#define NULL
Definition: coverity.c:32
static int filter_slice_packed(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_curves.c:536
AVFrame * out
Definition: af_adeclick.c:488
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2522
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVOption.
Definition: opt.h:246
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
struct keypoint * next
Definition: vf_curves.c:41
#define AV_PIX_FMT_GBRAP10
Definition: pixfmt.h:407
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
const char * g
Definition: vf_curves.c:115
const char * desc
Definition: nvenc.c:68
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define AV_PIX_FMT_RGBA64
Definition: pixfmt.h:377
FILE * av_fopen_utf8(const char *path, const char *mode)
Open a file using a UTF-8 filename.
Definition: file_open.c:158
#define CLIP(v)
Natural cubic spline interpolation Finding curves using Cubic Splines notes by Steven Rauch and John ...
Definition: vf_curves.c:215
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:168
static struct keypoint * make_point(double x, double y, struct keypoint *next)
Definition: vf_curves.c:143
const char * b
Definition: vf_curves.c:116
#define AV_PIX_FMT_GBRP10
Definition: pixfmt.h:403
#define AV_PIX_FMT_BGRA64
Definition: pixfmt.h:382
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
#define AD
int version
Definition: avisynth_c.h:858
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
packed BGR 8:8:8, 32bpp, XBGRXBGR... X=unused/undefined
Definition: pixfmt.h:239
const char * master
Definition: vf_curves.c:117
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:99
#define src
Definition: vp8dsp.c:254
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
#define G
Definition: vf_curves.c:35
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:244
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
char * psfile
Definition: vf_curves.c:68
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:125
BYTE int const BYTE * srcp
Definition: avisynth_c.h:908
const char * name
Pad name.
Definition: internal.h:60
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
char * plot_filename
Definition: vf_curves.c:71
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:117
static int filter_slice_planar(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_curves.c:584
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
static const AVOption curves_options[]
Definition: vf_curves.c:84
static av_cold int uninit(AVCodecContext *avctx)
Definition: crystalhd.c:279
packed RGB 8:8:8, 32bpp, RGBXRGBX... X=unused/undefined
Definition: pixfmt.h:238
AVOptions.
#define NB_COMP
Definition: vf_curves.c:44
#define f(width, name)
Definition: cbs_vp9.c:255
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_curves.c:717
#define AV_PIX_FMT_GBRP9
Definition: pixfmt.h:402
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
Misc file utilities.
static av_cold int curves_init(AVFilterContext *ctx)
Definition: vf_curves.c:470
#define AV_PIX_FMT_BGR48
Definition: pixfmt.h:378
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
static int parse_points_str(AVFilterContext *ctx, struct keypoint **points, const char *s, int lut_size)
Definition: vf_curves.c:155
ptrdiff_t size
Definition: opengl_enc.c:100
static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_bm3d.c:696
#define B
Definition: vf_curves.c:36
#define av_log(a,...)
static const struct @224 curves_presets[]
char * comp_points_str_all
Definition: vf_curves.c:65
A filter pad used for either input or output.
Definition: internal.h:54
#define FLAGS
Definition: vf_curves.c:83
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define SET_COMP_IF_NOT_SET(n, name)
int width
Definition: frame.h:353
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
void av_file_unmap(uint8_t *bufptr, size_t size)
Unmap or free the buffer bufptr created by av_file_map().
Definition: file.c:139
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:568
#define td
Definition: regdef.h:70
int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, int log_offset, void *log_ctx)
Read the file with name filename, and put its content in a newly allocated buffer or map it with mmap...
Definition: file.c:53
#define AV_BPRINT_SIZE_UNLIMITED
BYTE * dstp
Definition: avisynth_c.h:908
#define DECLARE_INTERPOLATE_FUNC(nbits)
Definition: vf_curves.c:339
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define READ16(dst)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
const char * r
Definition: vf_curves.c:114
void * priv
private data for use by the filter
Definition: avfilter.h:353
int av_get_padded_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)
Return the number of bits per pixel for the pixel format described by pixdesc, including any padding ...
Definition: pixdesc.c:2487
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:116
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
const char * arg
Definition: jacosubdec.c:66
#define AV_PIX_FMT_GBRAP12
Definition: pixfmt.h:408
#define AV_PIX_FMT_RGB48
Definition: pixfmt.h:373
simple assert() macros that are a bit more flexible than ISO C assert().
int av_log_get_level(void)
Get the current log level.
Definition: log.c:380
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
#define AV_PIX_FMT_GBRAP16
Definition: pixfmt.h:409
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
static int config_input(AVFilterLink *inlink)
Definition: vf_curves.c:650
double x
Definition: vf_curves.c:40
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:106
#define AV_PIX_FMT_GBRP16
Definition: pixfmt.h:406
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:802
#define R
Definition: vf_curves.c:34
char * comp_points_str[NB_COMP+1]
Definition: vf_curves.c:64
#define FFMIN(a, b)
Definition: common.h:96
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
int(* filter_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_curves.c:75
int n
Definition: avisynth_c.h:760
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AVFilter ff_vf_curves
Definition: vf_curves.c:773
#define AV_PIX_FMT_GBRP14
Definition: pixfmt.h:405
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
#define FF_ARRAY_ELEMS(a)
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:35
double av_strtod(const char *numstr, char **tail)
Parse the string in numstr and return its value as a double.
Definition: eval.c:106
#define AV_BPRINT_SIZE_AUTOMATIC
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
static int parse_psfile(AVFilterContext *ctx, const char *fname)
Definition: vf_curves.c:353
misc drawing utilities
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:594
Used for passing data between threads.
Definition: af_adeclick.c:487
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
#define BD
double y
Definition: vf_curves.c:40
void * buf
Definition: avisynth_c.h:766
static int dump_curves(const char *fname, uint16_t *graph[NB_COMP+1], struct keypoint *comp_points[NB_COMP+1], int lut_size)
Definition: vf_curves.c:409
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
static int get_nb_points(const struct keypoint *d)
Definition: vf_curves.c:199
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
#define OFFSET(x)
Definition: vf_curves.c:82
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
packed BGR 8:8:8, 32bpp, BGRXBGRX... X=unused/undefined
Definition: pixfmt.h:240
const char * name
Filter name.
Definition: avfilter.h:148
static const AVFilterPad curves_inputs[]
Definition: vf_curves.c:755
#define A
Definition: vf_curves.c:37
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
#define AV_PIX_FMT_GBRP12
Definition: pixfmt.h:404
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
Definition: avfilter.h:378
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
void av_bprint_clear(AVBPrint *buf)
Reset the string to "" but keep internal allocated data.
Definition: bprint.c:227
AVFILTER_DEFINE_CLASS(curves)
preset
Definition: vf_curves.c:46
int
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:215
uint16_t * graph[NB_COMP+1]
Definition: vf_curves.c:66
avfilter_execute_func * execute
Definition: internal.h:155
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2029
#define av_free(p)
uint8_t rgba_map[4]
Definition: vf_curves.c:69
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
int height
Definition: frame.h:353
FILE * out
Definition: movenc.c:54
#define av_freep(p)
static int query_formats(AVFilterContext *ctx)
Definition: vf_curves.c:512
AVFrame * in
Definition: af_afftdn.c:1082
internal API functions
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
static int interpolate(void *log_ctx, uint16_t *y, const struct keypoint *points, int nbits)
Definition: vf_curves.c:217
int depth
Number of bits in the component.
Definition: pixdesc.h:58
packed RGB 8:8:8, 32bpp, XRGBXRGB... X=unused/undefined
Definition: pixfmt.h:237
static av_cold void curves_uninit(AVFilterContext *ctx)
Definition: vf_curves.c:746
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:144
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:654
#define av_unused
Definition: attributes.h:125
static const AVFilterPad curves_outputs[]
Definition: vf_curves.c:765
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
simple arithmetic expression evaluator
void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.c:191