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vf_perspective.c
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1 /*
2  * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
3  * Copyright (c) 2013 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public
9  * License as published by the Free Software Foundation; either
10  * version 2 of the License, or (at your option) any later version.
11  *
12  * FFmpeg 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 along
18  * with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/avassert.h"
23 #include "libavutil/eval.h"
24 #include "libavutil/imgutils.h"
25 #include "libavutil/pixdesc.h"
26 #include "libavutil/opt.h"
27 #include "avfilter.h"
28 #include "formats.h"
29 #include "internal.h"
30 #include "video.h"
31 
32 #define SUB_PIXEL_BITS 8
33 #define SUB_PIXELS (1 << SUB_PIXEL_BITS)
34 #define COEFF_BITS 11
35 
36 #define LINEAR 0
37 #define CUBIC 1
38 
39 typedef struct PerspectiveContext {
40  const AVClass *class;
41  char *expr_str[4][2];
42  double ref[4][2];
43  int32_t (*pv)[2];
46  int linesize[4];
47  int height[4];
48  int hsub, vsub;
49  int nb_planes;
50  int sense;
51  int eval_mode;
52 
54  void *arg, int job, int nb_jobs);
56 
57 #define OFFSET(x) offsetof(PerspectiveContext, x)
58 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
59 
61  PERSPECTIVE_SENSE_SOURCE = 0, ///< coordinates give locations in source of corners of destination.
62  PERSPECTIVE_SENSE_DESTINATION = 1, ///< coordinates give locations in destination of corners of source.
63 };
64 
65 enum EvalMode {
69 };
70 
71 static const AVOption perspective_options[] = {
72  { "x0", "set top left x coordinate", OFFSET(expr_str[0][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
73  { "y0", "set top left y coordinate", OFFSET(expr_str[0][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
74  { "x1", "set top right x coordinate", OFFSET(expr_str[1][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
75  { "y1", "set top right y coordinate", OFFSET(expr_str[1][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
76  { "x2", "set bottom left x coordinate", OFFSET(expr_str[2][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
77  { "y2", "set bottom left y coordinate", OFFSET(expr_str[2][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
78  { "x3", "set bottom right x coordinate", OFFSET(expr_str[3][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
79  { "y3", "set bottom right y coordinate", OFFSET(expr_str[3][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
80  { "interpolation", "set interpolation", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, 1, FLAGS, "interpolation" },
81  { "linear", "", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "interpolation" },
82  { "cubic", "", 0, AV_OPT_TYPE_CONST, {.i64=CUBIC}, 0, 0, FLAGS, "interpolation" },
83  { "sense", "specify the sense of the coordinates", OFFSET(sense), AV_OPT_TYPE_INT, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 1, FLAGS, "sense"},
84  { "source", "specify locations in source to send to corners in destination",
85  0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 0, FLAGS, "sense"},
86  { "destination", "specify locations in destination to send corners of source",
87  0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_DESTINATION}, 0, 0, FLAGS, "sense"},
88  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
89  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
90  { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
91 
92  { NULL }
93 };
94 
95 AVFILTER_DEFINE_CLASS(perspective);
96 
98 {
99  static const enum AVPixelFormat pix_fmts[] = {
104  };
105 
106  AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
107  if (!fmts_list)
108  return AVERROR(ENOMEM);
109  return ff_set_common_formats(ctx, fmts_list);
110 }
111 
112 static inline double get_coeff(double d)
113 {
114  double coeff, A = -0.60;
115 
116  d = fabs(d);
117 
118  if (d < 1.0)
119  coeff = (1.0 - (A + 3.0) * d * d + (A + 2.0) * d * d * d);
120  else if (d < 2.0)
121  coeff = (-4.0 * A + 8.0 * A * d - 5.0 * A * d * d + A * d * d * d);
122  else
123  coeff = 0.0;
124 
125  return coeff;
126 }
127 
128 static const char *const var_names[] = { "W", "H", "in", "on", NULL };
130 
132 {
133  PerspectiveContext *s = ctx->priv;
134  AVFilterLink *outlink = ctx->outputs[0];
135  double (*ref)[2] = s->ref;
136 
137  double values[VAR_VARS_NB] = { [VAR_W] = inlink->w, [VAR_H] = inlink->h,
138  [VAR_IN] = inlink->frame_count + 1,
139  [VAR_ON] = outlink->frame_count + 1 };
140  const int h = values[VAR_H];
141  const int w = values[VAR_W];
142  double x0, x1, x2, x3, x4, x5, x6, x7, x8, q;
143  double t0, t1, t2, t3;
144  int x, y, i, j, ret;
145 
146  for (i = 0; i < 4; i++) {
147  for (j = 0; j < 2; j++) {
148  if (!s->expr_str[i][j])
149  return AVERROR(EINVAL);
150  ret = av_expr_parse_and_eval(&s->ref[i][j], s->expr_str[i][j],
151  var_names, &values[0],
152  NULL, NULL, NULL, NULL,
153  0, 0, ctx);
154  if (ret < 0)
155  return ret;
156  }
157  }
158 
159  switch (s->sense) {
161  x6 = ((ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0]) *
162  (ref[2][1] - ref[3][1]) -
163  ( ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1]) *
164  (ref[2][0] - ref[3][0])) * h;
165  x7 = ((ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1]) *
166  (ref[1][0] - ref[3][0]) -
167  ( ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0]) *
168  (ref[1][1] - ref[3][1])) * w;
169  q = ( ref[1][0] - ref[3][0]) * (ref[2][1] - ref[3][1]) -
170  ( ref[2][0] - ref[3][0]) * (ref[1][1] - ref[3][1]);
171 
172  x0 = q * (ref[1][0] - ref[0][0]) * h + x6 * ref[1][0];
173  x1 = q * (ref[2][0] - ref[0][0]) * w + x7 * ref[2][0];
174  x2 = q * ref[0][0] * w * h;
175  x3 = q * (ref[1][1] - ref[0][1]) * h + x6 * ref[1][1];
176  x4 = q * (ref[2][1] - ref[0][1]) * w + x7 * ref[2][1];
177  x5 = q * ref[0][1] * w * h;
178  x8 = q * w * h;
179  break;
181  t0 = ref[0][0] * (ref[3][1] - ref[1][1]) +
182  ref[1][0] * (ref[0][1] - ref[3][1]) +
183  ref[3][0] * (ref[1][1] - ref[0][1]);
184  t1 = ref[1][0] * (ref[2][1] - ref[3][1]) +
185  ref[2][0] * (ref[3][1] - ref[1][1]) +
186  ref[3][0] * (ref[1][1] - ref[2][1]);
187  t2 = ref[0][0] * (ref[3][1] - ref[2][1]) +
188  ref[2][0] * (ref[0][1] - ref[3][1]) +
189  ref[3][0] * (ref[2][1] - ref[0][1]);
190  t3 = ref[0][0] * (ref[1][1] - ref[2][1]) +
191  ref[1][0] * (ref[2][1] - ref[0][1]) +
192  ref[2][0] * (ref[0][1] - ref[1][1]);
193 
194  x0 = t0 * t1 * w * (ref[2][1] - ref[0][1]);
195  x1 = t0 * t1 * w * (ref[0][0] - ref[2][0]);
196  x2 = t0 * t1 * w * (ref[0][1] * ref[2][0] - ref[0][0] * ref[2][1]);
197  x3 = t1 * t2 * h * (ref[1][1] - ref[0][1]);
198  x4 = t1 * t2 * h * (ref[0][0] - ref[1][0]);
199  x5 = t1 * t2 * h * (ref[0][1] * ref[1][0] - ref[0][0] * ref[1][1]);
200  x6 = t1 * t2 * (ref[1][1] - ref[0][1]) +
201  t0 * t3 * (ref[2][1] - ref[3][1]);
202  x7 = t1 * t2 * (ref[0][0] - ref[1][0]) +
203  t0 * t3 * (ref[3][0] - ref[2][0]);
204  x8 = t1 * t2 * (ref[0][1] * ref[1][0] - ref[0][0] * ref[1][1]) +
205  t0 * t3 * (ref[2][0] * ref[3][1] - ref[2][1] * ref[3][0]);
206  break;
207  default:
208  av_assert0(0);
209  }
210 
211  for (y = 0; y < h; y++){
212  for (x = 0; x < w; x++){
213  int u, v;
214 
215  u = lrint(SUB_PIXELS * (x0 * x + x1 * y + x2) /
216  (x6 * x + x7 * y + x8));
217  v = lrint(SUB_PIXELS * (x3 * x + x4 * y + x5) /
218  (x6 * x + x7 * y + x8));
219 
220  s->pv[x + y * w][0] = u;
221  s->pv[x + y * w][1] = v;
222  }
223  }
224 
225  return 0;
226 }
227 
228 static int config_input(AVFilterLink *inlink)
229 {
230  AVFilterContext *ctx = inlink->dst;
231  PerspectiveContext *s = ctx->priv;
232  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
233  int h = inlink->h;
234  int w = inlink->w;
235  int i, j, ret;
236  s->hsub = desc->log2_chroma_w;
237  s->vsub = desc->log2_chroma_h;
239  if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
240  return ret;
241 
242  s->height[1] = s->height[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
243  s->height[0] = s->height[3] = inlink->h;
244 
245  s->pv = av_realloc_f(s->pv, w * h, 2 * sizeof(*s->pv));
246  if (!s->pv)
247  return AVERROR(ENOMEM);
248 
249  if (s->eval_mode == EVAL_MODE_INIT) {
250  if ((ret = calc_persp_luts(ctx, inlink)) < 0) {
251  return ret;
252  }
253  }
254 
255  for (i = 0; i < SUB_PIXELS; i++){
256  double d = i / (double)SUB_PIXELS;
257  double temp[4];
258  double sum = 0;
259 
260  for (j = 0; j < 4; j++)
261  temp[j] = get_coeff(j - d - 1);
262 
263  for (j = 0; j < 4; j++)
264  sum += temp[j];
265 
266  for (j = 0; j < 4; j++)
267  s->coeff[i][j] = lrint((1 << COEFF_BITS) * temp[j] / sum);
268  }
269 
270  return 0;
271 }
272 
273 typedef struct ThreadData {
278  int w, h;
279  int hsub, vsub;
280 } ThreadData;
281 
283  int job, int nb_jobs)
284 {
285  PerspectiveContext *s = ctx->priv;
286  ThreadData *td = arg;
287  uint8_t *dst = td->dst;
288  int dst_linesize = td->dst_linesize;
289  uint8_t *src = td->src;
290  int src_linesize = td->src_linesize;
291  int w = td->w;
292  int h = td->h;
293  int hsub = td->hsub;
294  int vsub = td->vsub;
295  int start = (h * job) / nb_jobs;
296  int end = (h * (job+1)) / nb_jobs;
297  const int linesize = s->linesize[0];
298  int x, y;
299 
300  for (y = start; y < end; y++) {
301  int sy = y << vsub;
302  for (x = 0; x < w; x++) {
303  int u, v, subU, subV, sum, sx;
304 
305  sx = x << hsub;
306  u = s->pv[sx + sy * linesize][0] >> hsub;
307  v = s->pv[sx + sy * linesize][1] >> vsub;
308  subU = u & (SUB_PIXELS - 1);
309  subV = v & (SUB_PIXELS - 1);
310  u >>= SUB_PIXEL_BITS;
311  v >>= SUB_PIXEL_BITS;
312 
313  if (u > 0 && v > 0 && u < w - 2 && v < h - 2){
314  const int index = u + v*src_linesize;
315  const int a = s->coeff[subU][0];
316  const int b = s->coeff[subU][1];
317  const int c = s->coeff[subU][2];
318  const int d = s->coeff[subU][3];
319 
320  sum = s->coeff[subV][0] * (a * src[index - 1 - src_linesize] + b * src[index - 0 - src_linesize] +
321  c * src[index + 1 - src_linesize] + d * src[index + 2 - src_linesize]) +
322  s->coeff[subV][1] * (a * src[index - 1 ] + b * src[index - 0 ] +
323  c * src[index + 1 ] + d * src[index + 2 ]) +
324  s->coeff[subV][2] * (a * src[index - 1 + src_linesize] + b * src[index - 0 + src_linesize] +
325  c * src[index + 1 + src_linesize] + d * src[index + 2 + src_linesize]) +
326  s->coeff[subV][3] * (a * src[index - 1 + 2 * src_linesize] + b * src[index - 0 + 2 * src_linesize] +
327  c * src[index + 1 + 2 * src_linesize] + d * src[index + 2 + 2 * src_linesize]);
328  } else {
329  int dx, dy;
330 
331  sum = 0;
332 
333  for (dy = 0; dy < 4; dy++) {
334  int iy = v + dy - 1;
335 
336  if (iy < 0)
337  iy = 0;
338  else if (iy >= h)
339  iy = h-1;
340  for (dx = 0; dx < 4; dx++) {
341  int ix = u + dx - 1;
342 
343  if (ix < 0)
344  ix = 0;
345  else if (ix >= w)
346  ix = w - 1;
347 
348  sum += s->coeff[subU][dx] * s->coeff[subV][dy] * src[ ix + iy * src_linesize];
349  }
350  }
351  }
352 
353  sum = (sum + (1<<(COEFF_BITS * 2 - 1))) >> (COEFF_BITS * 2);
354  sum = av_clip_uint8(sum);
355  dst[x + y * dst_linesize] = sum;
356  }
357  }
358  return 0;
359 }
360 
362  int job, int nb_jobs)
363 {
364  PerspectiveContext *s = ctx->priv;
365  ThreadData *td = arg;
366  uint8_t *dst = td->dst;
367  int dst_linesize = td->dst_linesize;
368  uint8_t *src = td->src;
369  int src_linesize = td->src_linesize;
370  int w = td->w;
371  int h = td->h;
372  int hsub = td->hsub;
373  int vsub = td->vsub;
374  int start = (h * job) / nb_jobs;
375  int end = (h * (job+1)) / nb_jobs;
376  const int linesize = s->linesize[0];
377  int x, y;
378 
379  for (y = start; y < end; y++){
380  int sy = y << vsub;
381  for (x = 0; x < w; x++){
382  int u, v, subU, subV, sum, sx, index, subUI, subVI;
383 
384  sx = x << hsub;
385  u = s->pv[sx + sy * linesize][0] >> hsub;
386  v = s->pv[sx + sy * linesize][1] >> vsub;
387  subU = u & (SUB_PIXELS - 1);
388  subV = v & (SUB_PIXELS - 1);
389  u >>= SUB_PIXEL_BITS;
390  v >>= SUB_PIXEL_BITS;
391 
392  index = u + v * src_linesize;
393  subUI = SUB_PIXELS - subU;
394  subVI = SUB_PIXELS - subV;
395 
396  if ((unsigned)u < (unsigned)(w - 1)){
397  if((unsigned)v < (unsigned)(h - 1)){
398  sum = subVI * (subUI * src[index] + subU * src[index + 1]) +
399  subV * (subUI * src[index + src_linesize] + subU * src[index + src_linesize + 1]);
400  sum = (sum + (1 << (SUB_PIXEL_BITS * 2 - 1)))>> (SUB_PIXEL_BITS * 2);
401  } else {
402  if (v < 0)
403  v = 0;
404  else
405  v = h - 1;
406  index = u + v * src_linesize;
407  sum = subUI * src[index] + subU * src[index + 1];
408  sum = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS;
409  }
410  } else {
411  if (u < 0)
412  u = 0;
413  else
414  u = w - 1;
415  if ((unsigned)v < (unsigned)(h - 1)){
416  index = u + v * src_linesize;
417  sum = subVI * src[index] + subV * src[index + src_linesize];
418  sum = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS;
419  } else {
420  if (v < 0)
421  v = 0;
422  else
423  v = h - 1;
424  index = u + v * src_linesize;
425  sum = src[index];
426  }
427  }
428 
429  sum = av_clip_uint8(sum);
430  dst[x + y * dst_linesize] = sum;
431  }
432  }
433  return 0;
434 }
435 
437 {
438  PerspectiveContext *s = ctx->priv;
439 
440  switch (s->interpolation) {
441  case LINEAR: s->perspective = resample_linear; break;
442  case CUBIC: s->perspective = resample_cubic; break;
443  }
444 
445  return 0;
446 }
447 
448 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
449 {
450  AVFilterContext *ctx = inlink->dst;
451  AVFilterLink *outlink = ctx->outputs[0];
452  PerspectiveContext *s = ctx->priv;
453  AVFrame *out;
454  int plane;
455  int ret;
456 
457  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
458  if (!out) {
459  av_frame_free(&frame);
460  return AVERROR(ENOMEM);
461  }
462  av_frame_copy_props(out, frame);
463 
464  if (s->eval_mode == EVAL_MODE_FRAME) {
465  if ((ret = calc_persp_luts(ctx, inlink)) < 0) {
466  return ret;
467  }
468  }
469 
470  for (plane = 0; plane < s->nb_planes; plane++) {
471  int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
472  int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
473  ThreadData td = {.dst = out->data[plane],
474  .dst_linesize = out->linesize[plane],
475  .src = frame->data[plane],
476  .src_linesize = frame->linesize[plane],
477  .w = s->linesize[plane],
478  .h = s->height[plane],
479  .hsub = hsub,
480  .vsub = vsub };
481  ctx->internal->execute(ctx, s->perspective, &td, NULL, FFMIN(td.h, ctx->graph->nb_threads));
482  }
483 
484  av_frame_free(&frame);
485  return ff_filter_frame(outlink, out);
486 }
487 
489 {
490  PerspectiveContext *s = ctx->priv;
491 
492  av_freep(&s->pv);
493 }
494 
495 static const AVFilterPad perspective_inputs[] = {
496  {
497  .name = "default",
498  .type = AVMEDIA_TYPE_VIDEO,
499  .filter_frame = filter_frame,
500  .config_props = config_input,
501  },
502  { NULL }
503 };
504 
506  {
507  .name = "default",
508  .type = AVMEDIA_TYPE_VIDEO,
509  },
510  { NULL }
511 };
512 
514  .name = "perspective",
515  .description = NULL_IF_CONFIG_SMALL("Correct the perspective of video."),
516  .priv_size = sizeof(PerspectiveContext),
517  .init = init,
518  .uninit = uninit,
520  .inputs = perspective_inputs,
521  .outputs = perspective_outputs,
522  .priv_class = &perspective_class,
524 };
int plane
Definition: avisynth_c.h:291
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
static int resample_linear(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
double ref[4][2]
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2193
This structure describes decoded (raw) audio or video data.
Definition: frame.h:180
#define av_realloc_f(p, o, n)
AVOption.
Definition: opt.h:245
const AVFrame * src
AVFormatContext * ctx
Definition: movenc-test.c:48
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
misc image utilities
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2233
Main libavfilter public API header.
else temp
Definition: vf_mcdeint.c:259
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:180
const char * b
Definition: vf_curves.c:109
AVFILTER_DEFINE_CLASS(perspective)
static int resample_cubic(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
#define COEFF_BITS
coordinates give locations in destination of corners of source.
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:76
static int query_formats(AVFilterContext *ctx)
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:92
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
struct AVFilterGraph * graph
filtergraph this filter belongs to
Definition: avfilter.h:322
#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:123
static int config_input(AVFilterLink *inlink)
const char * name
Pad name.
Definition: internal.h:59
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t * src
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1180
static av_cold void uninit(AVFilterContext *ctx)
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:102
uint8_t
#define av_cold
Definition: attributes.h:82
int32_t coeff[SUB_PIXELS][4]
AVOptions.
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
#define t0
Definition: regdef.h:28
static AVFrame * frame
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range...
Definition: pixfmt.h:101
int nb_threads
Maximum number of threads used by filters in this graph.
Definition: avfilter.h:804
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:75
static const AVFilterPad perspective_inputs[]
#define A(x)
Definition: vp56_arith.h:28
A filter pad used for either input or output.
Definition: internal.h:53
int32_t(* pv)[2]
int av_expr_parse_and_eval(double *d, const char *s, const char *const *const_names, const double *const_values, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), void *opaque, int log_offset, void *log_ctx)
Parse and evaluate an expression.
Definition: eval.c:723
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:187
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
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:153
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void * priv
private data for use by the filter
Definition: avfilter.h:320
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:114
#define t1
Definition: regdef.h:29
const char * arg
Definition: jacosubdec.c:66
simple assert() macros that are a bit more flexible than ISO C assert().
#define t3
Definition: regdef.h:31
#define FLAGS
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
PERSPECTIVESense
#define FFMIN(a, b)
Definition: common.h:96
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:74
#define SUB_PIXELS
int32_t
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:386
#define src
Definition: vp9dsp.c:530
EvalMode
Definition: af_volume.h:39
FILE * out
Definition: movenc-test.c:54
static int calc_persp_luts(AVFilterContext *ctx, AVFilterLink *inlink)
AVFrame * dst
Definition: vf_blend.c:55
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:376
coordinates give locations in source of corners of destination.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:211
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:188
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
#define SUB_PIXEL_BITS
char * expr_str[4][2]
#define CUBIC
int(* perspective)(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
#define LINEAR
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:68
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:142
int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
Fill plane linesizes for an image with pixel format pix_fmt and width width.
Definition: imgutils.c:88
int index
Definition: gxfenc.c:89
static const char *const var_names[]
#define OFFSET(x)
const char * name
Filter name.
Definition: avfilter.h:146
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:317
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
uint8_t * dst
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
Definition: avfilter.h:345
static int flags
Definition: cpu.c:47
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:194
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
Y , 8bpp.
Definition: pixfmt.h:70
static av_cold int init(AVFilterContext *ctx)
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:228
static double c[64]
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:76
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:69
avfilter_execute_func * execute
Definition: internal.h:153
static double get_coeff(double d)
AVFilter ff_vf_perspective
A list of supported formats for one end of a filter link.
Definition: formats.h:64
static const double coeff[2][5]
Definition: vf_owdenoise.c:71
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples) full scale (JPEG), deprecated in favor ...
Definition: pixfmt.h:271
#define lrint
Definition: tablegen.h:53
An instance of a filter.
Definition: avfilter.h:305
#define av_freep(p)
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:100
static const AVFilterPad perspective_outputs[]
void INT64 start
Definition: avisynth_c.h:553
static const AVOption perspective_options[]
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:574
#define t2
Definition: regdef.h:30
simple arithmetic expression evaluator
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58