FFmpeg
vsrc_gradients.c
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1 /*
2  * Copyright (c) 2020 Paul B Mahol
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 "avfilter.h"
22 #include "filters.h"
23 #include "video.h"
24 #include "internal.h"
25 #include "libavutil/imgutils.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/lfg.h"
28 #include "libavutil/random_seed.h"
29 #include <float.h>
30 #include <math.h>
31 
32 typedef struct GradientsContext {
33  const AVClass *class;
34  int w, h;
35  int type;
36  AVRational frame_rate;
37  int64_t pts;
38  int64_t duration; ///< duration expressed in microseconds
39  float speed;
40 
41  uint8_t color_rgba[8][4];
42  float color_rgbaf[8][4];
43  int nb_colors;
44  int x0, y0, x1, y1;
45  float fx0, fy0, fx1, fy1;
46 
47  int64_t seed;
48 
49  AVLFG lfg;
50  int (*draw_slice)(AVFilterContext *ctx, void *arg, int job, int nb_jobs);
51 } GradientsContext;
52 
53 #define OFFSET(x) offsetof(GradientsContext, x)
54 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
55 
56 static const AVOption gradients_options[] = {
57  {"size", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
58  {"s", "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="640x480"}, 0, 0, FLAGS },
59  {"rate", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
60  {"r", "set frame rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
61  {"c0", "set 1st color", OFFSET(color_rgba[0]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
62  {"c1", "set 2nd color", OFFSET(color_rgba[1]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
63  {"c2", "set 3rd color", OFFSET(color_rgba[2]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
64  {"c3", "set 4th color", OFFSET(color_rgba[3]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
65  {"c4", "set 5th color", OFFSET(color_rgba[4]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
66  {"c5", "set 6th color", OFFSET(color_rgba[5]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
67  {"c6", "set 7th color", OFFSET(color_rgba[6]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
68  {"c7", "set 8th color", OFFSET(color_rgba[7]), AV_OPT_TYPE_COLOR, {.str = "random"}, 0, 0, FLAGS },
69  {"x0", "set gradient line source x0", OFFSET(x0), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
70  {"y0", "set gradient line source y0", OFFSET(y0), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
71  {"x1", "set gradient line destination x1", OFFSET(x1), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
72  {"y1", "set gradient line destination y1", OFFSET(y1), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
73  {"nb_colors", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS },
74  {"n", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS },
75  {"seed", "set the seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS },
76  {"duration", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },
77  {"d", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },
78  {"speed", "set gradients rotation speed", OFFSET(speed), AV_OPT_TYPE_FLOAT,{.dbl=0.01}, 0, 1, FLAGS },
79  {"type", "set gradient type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 4, FLAGS, "type" },
80  {"t", "set gradient type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 4, FLAGS, "type" },
81  { "linear", "set linear gradient", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "type" },
82  { "radial", "set radial gradient", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "type" },
83  { "circular", "set circular gradient", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "type" },
84  { "spiral", "set spiral gradient", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, FLAGS, "type" },
85  { "square", "set square gradient", 0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, FLAGS, "type" },
86  {NULL},
87 };
88 
89 AVFILTER_DEFINE_CLASS(gradients);
90 
91 static float lerpf(float a, float b, float x)
92 {
93  const float y = 1.f - x;
94 
95  return a * y + b * x;
96 }
97 
98 static uint32_t lerp_color(uint8_t c0[4], uint8_t c1[4], float x)
99 {
100  const float y = 1.f - x;
101 
102  return (lrintf(c0[0] * y + c1[0] * x)) << 0 |
103  (lrintf(c0[1] * y + c1[1] * x)) << 8 |
104  (lrintf(c0[2] * y + c1[2] * x)) << 16 |
105  (lrintf(c0[3] * y + c1[3] * x)) << 24;
106 }
107 
108 static uint64_t lerp_color16(uint8_t c0[4], uint8_t c1[4], float x)
109 {
110  const float y = 1.f - x;
111 
112  return ((uint64_t)llrintf((c0[0] * y + c1[0] * x) * 256)) << 0 |
113  ((uint64_t)llrintf((c0[1] * y + c1[1] * x) * 256)) << 16 |
114  ((uint64_t)llrintf((c0[2] * y + c1[2] * x) * 256)) << 32 |
115  ((uint64_t)llrintf((c0[3] * y + c1[3] * x) * 256)) << 48;
116 }
117 
118 static uint32_t lerp_colors(uint8_t arr[8][4], int nb_colors, int nb_wrap_colors, float step)
119 {
120  float scl;
121  int i, j;
122 
123  if (nb_colors == 1 || step <= 0.0) {
124  return arr[0][0] | (arr[0][1] << 8) | (arr[0][2] << 16) | (arr[0][3] << 24);
125  } else if (step >= 1.0) {
126  i = nb_colors - 1;
127  return arr[i][0] | (arr[i][1] << 8) | (arr[i][2] << 16) | (arr[i][3] << 24);
128  }
129 
130  scl = step * (nb_wrap_colors - 1);
131  i = floorf(scl);
132  j = i + 1;
133  if (i >= nb_colors - 1) {
134  i = nb_colors - 1;
135  j = 0;
136  }
137 
138  return lerp_color(arr[i], arr[j], scl - i);
139 }
140 
141 static uint64_t lerp_colors16(uint8_t arr[8][4], int nb_colors, int nb_wrap_colors, float step)
142 {
143  float scl;
144  int i, j;
145 
146  if (nb_colors == 1 || step <= 0.0) {
147  return ((uint64_t)arr[0][0] << 8) | ((uint64_t)arr[0][1] << 24) | ((uint64_t)arr[0][2] << 40) | ((uint64_t)arr[0][3] << 56);
148  } else if (step >= 1.0) {
149  i = nb_colors - 1;
150  return ((uint64_t)arr[i][0] << 8) | ((uint64_t)arr[i][1] << 24) | ((uint64_t)arr[i][2] << 40) | ((uint64_t)arr[i][3] << 56);
151  }
152 
153  scl = step * (nb_wrap_colors - 1);
154  i = floorf(scl);
155  j = i + 1;
156  if (i >= nb_colors - 1) {
157  i = nb_colors - 1;
158  j = 0;
159  }
160 
161  return lerp_color16(arr[i], arr[j], scl - i);
162 }
163 
164 static void lerp_colors32(float arr[8][4], int nb_colors,
165  int nb_wrap_colors, float step,
166  float *r, float *g, float *b, float *a)
167 {
168  float scl, x;
169  int i, j;
170 
171  if (nb_colors == 1 || step <= 0.0) {
172  *r = arr[0][0];
173  *g = arr[0][1];
174  *b = arr[0][2];
175  *a = arr[0][3];
176  return;
177  } else if (step >= 1.0) {
178  i = nb_colors - 1;
179  *r = arr[i][0];
180  *g = arr[i][1];
181  *b = arr[i][2];
182  *a = arr[i][3];
183  return;
184  }
185 
186  scl = step * (nb_wrap_colors - 1);
187  i = floorf(scl);
188  j = i + 1;
189  if (i >= nb_colors - 1) {
190  i = nb_colors - 1;
191  j = 0;
192  }
193  x = scl - i;
194 
195  *r = lerpf(arr[i][0], arr[j][0], x);
196  *g = lerpf(arr[i][1], arr[j][1], x);
197  *b = lerpf(arr[i][2], arr[j][2], x);
198  *a = lerpf(arr[i][3], arr[j][3], x);
199 }
200 
201 static float project(float origin_x, float origin_y,
202  float dest_x, float dest_y,
203  float point_x, float point_y, int type)
204 {
205  float op_x = point_x - origin_x;
206  float op_y = point_y - origin_y;
207  float od_x = dest_x - origin_x;
208  float od_y = dest_y - origin_y;
209  float op_x_od;
210  float od_s_q;
211 
212  switch (type) {
213  case 0:
214  od_s_q = od_x * od_x + od_y * od_y;
215  break;
216  case 1:
217  od_s_q = sqrtf(od_x * od_x + od_y * od_y);
218  break;
219  case 2:
220  case 3:
221  od_s_q = M_PI * 2.f;
222  break;
223  case 4:
224  od_s_q = fmaxf(fabsf(od_x), fabsf(od_y));
225  break;
226  }
227 
228  switch (type) {
229  case 0:
230  op_x_od = op_x * od_x + op_y * od_y;
231  break;
232  case 1:
233  op_x_od = sqrtf(op_x * op_x + op_y * op_y);
234  break;
235  case 2:
236  op_x_od = atan2f(op_x, op_y) + M_PI;
237  break;
238  case 3:
239  op_x_od = fmodf(atan2f(op_x, op_y) + M_PI + point_x / fmaxf(origin_x, dest_x), 2.f * M_PI);
240  break;
241  case 4:
242  op_x_od = fmaxf(fabsf(op_x), fabsf(op_y));
243  break;
244  }
245 
246  // Normalize and clamp range.
247  return av_clipf(op_x_od / od_s_q, 0.f, 1.f);
248 }
249 
250 static int draw_gradients_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
251 {
252  GradientsContext *s = ctx->priv;
253  AVFrame *frame = arg;
254  const int width = frame->width;
255  const int height = frame->height;
256  const int start = (height * job ) / nb_jobs;
257  const int end = (height * (job+1)) / nb_jobs;
258  const ptrdiff_t linesize = frame->linesize[0] / 4;
259  uint32_t *dst = (uint32_t *)frame->data[0] + start * linesize;
260  const int type = s->type;
261 
262  for (int y = start; y < end; y++) {
263  for (int x = 0; x < width; x++) {
264  float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type);
265  dst[x] = lerp_colors(s->color_rgba, s->nb_colors, s->nb_colors + (type >= 2 && type <= 3), factor);
266  }
267 
268  dst += linesize;
269  }
270 
271  return 0;
272 }
273 
274 static int draw_gradients_slice16(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
275 {
276  GradientsContext *s = ctx->priv;
277  AVFrame *frame = arg;
278  const int width = frame->width;
279  const int height = frame->height;
280  const int start = (height * job ) / nb_jobs;
281  const int end = (height * (job+1)) / nb_jobs;
282  const ptrdiff_t linesize = frame->linesize[0] / 8;
283  uint64_t *dst = (uint64_t *)frame->data[0] + start * linesize;
284  const int type = s->type;
285 
286  for (int y = start; y < end; y++) {
287  for (int x = 0; x < width; x++) {
288  float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type);
289  dst[x] = lerp_colors16(s->color_rgba, s->nb_colors, s->nb_colors + (type >= 2 && type <= 3), factor);
290  }
291 
292  dst += linesize;
293  }
294 
295  return 0;
296 }
297 
298 static int draw_gradients_slice32_planar(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
299 {
300  GradientsContext *s = ctx->priv;
301  AVFrame *frame = arg;
302  const int width = frame->width;
303  const int height = frame->height;
304  const int start = (height * job ) / nb_jobs;
305  const int end = (height * (job+1)) / nb_jobs;
306  const ptrdiff_t linesize_g = frame->linesize[0] / 4;
307  const ptrdiff_t linesize_b = frame->linesize[1] / 4;
308  const ptrdiff_t linesize_r = frame->linesize[2] / 4;
309  const ptrdiff_t linesize_a = frame->linesize[3] / 4;
310  float *dst_g = (float *)frame->data[0] + start * linesize_g;
311  float *dst_b = (float *)frame->data[1] + start * linesize_b;
312  float *dst_r = (float *)frame->data[2] + start * linesize_r;
313  float *dst_a = (float *)frame->data[3] + start * linesize_a;
314  const int type = s->type;
315 
316  for (int y = start; y < end; y++) {
317  for (int x = 0; x < width; x++) {
318  float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type);
319  lerp_colors32(s->color_rgbaf, s->nb_colors, s->nb_colors + (type >= 2 && type <= 3), factor,
320  &dst_r[x], &dst_g[x], &dst_b[x], &dst_a[x]);
321  }
322 
323  dst_g += linesize_g;
324  dst_b += linesize_b;
325  dst_r += linesize_r;
326  dst_a += linesize_a;
327  }
328 
329  return 0;
330 }
331 
332 static int config_output(AVFilterLink *outlink)
333 {
334  AVFilterContext *ctx = outlink->src;
335  GradientsContext *s = ctx->priv;
336  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
337 
338  if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
339  return AVERROR(EINVAL);
340 
341  outlink->w = s->w;
342  outlink->h = s->h;
343  outlink->time_base = av_inv_q(s->frame_rate);
344  outlink->sample_aspect_ratio = (AVRational) {1, 1};
345  outlink->frame_rate = s->frame_rate;
346  if (s->seed == -1)
347  s->seed = av_get_random_seed();
348  av_lfg_init(&s->lfg, s->seed);
349 
350  switch (desc->comp[0].depth) {
351  case 8:
352  s->draw_slice = draw_gradients_slice;
353  break;
354  case 16:
355  s->draw_slice = draw_gradients_slice16;
356  break;
357  case 32:
358  s->draw_slice = draw_gradients_slice32_planar;
359  break;
360  default:
361  return AVERROR_BUG;
362  }
363 
364  if (s->x0 < 0 || s->x0 >= s->w)
365  s->x0 = av_lfg_get(&s->lfg) % s->w;
366  if (s->y0 < 0 || s->y0 >= s->h)
367  s->y0 = av_lfg_get(&s->lfg) % s->h;
368  if (s->x1 < 0 || s->x1 >= s->w)
369  s->x1 = av_lfg_get(&s->lfg) % s->w;
370  if (s->y1 < 0 || s->y1 >= s->h)
371  s->y1 = av_lfg_get(&s->lfg) % s->h;
372 
373  for (int n = 0; n < 8; n++) {
374  for (int c = 0; c < 4; c++)
375  s->color_rgbaf[n][c] = s->color_rgba[n][c] / 255.f;
376  }
377 
378  return 0;
379 }
380 
381 static int activate(AVFilterContext *ctx)
382 {
383  GradientsContext *s = ctx->priv;
384  AVFilterLink *outlink = ctx->outputs[0];
385 
386  if (s->duration >= 0 &&
387  av_rescale_q(s->pts, outlink->time_base, AV_TIME_BASE_Q) >= s->duration) {
388  ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
389  return 0;
390  }
391 
392  if (ff_outlink_frame_wanted(outlink)) {
393  AVFrame *frame = ff_get_video_buffer(outlink, s->w, s->h);
394  float angle = (s->speed > 0.f) ? fmodf(s->pts * s->speed, 2.f * M_PI) : 1.f;
395  const float w2 = s->w / 2.f;
396  const float h2 = s->h / 2.f;
397 
398  s->fx0 = (s->x0 - w2) * cosf(angle) - (s->y0 - h2) * sinf(angle) + w2;
399  s->fy0 = (s->x0 - w2) * sinf(angle) + (s->y0 - h2) * cosf(angle) + h2;
400 
401  s->fx1 = (s->x1 - w2) * cosf(angle) - (s->y1 - h2) * sinf(angle) + w2;
402  s->fy1 = (s->x1 - w2) * sinf(angle) + (s->y1 - h2) * cosf(angle) + h2;
403 
404  if (!frame)
405  return AVERROR(ENOMEM);
406 
407 #if FF_API_FRAME_KEY
408 FF_DISABLE_DEPRECATION_WARNINGS
409  frame->key_frame = 1;
410 FF_ENABLE_DEPRECATION_WARNINGS
411 #endif
412 
413  frame->flags |= AV_FRAME_FLAG_KEY;
414 #if FF_API_INTERLACED_FRAME
415 FF_DISABLE_DEPRECATION_WARNINGS
416  frame->interlaced_frame = 0;
417 FF_ENABLE_DEPRECATION_WARNINGS
418 #endif
419  frame->flags &= ~AV_FRAME_FLAG_INTERLACED;
420  frame->pict_type = AV_PICTURE_TYPE_I;
421  frame->sample_aspect_ratio = (AVRational) {1, 1};
422  frame->pts = s->pts++;
423  frame->duration = 1;
424 
425  ff_filter_execute(ctx, s->draw_slice, frame, NULL,
426  FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
427 
428  return ff_filter_frame(outlink, frame);
429  }
430 
431  return FFERROR_NOT_READY;
432 }
433 
434 static const AVFilterPad gradients_outputs[] = {
435  {
436  .name = "default",
437  .type = AVMEDIA_TYPE_VIDEO,
438  .config_props = config_output,
439  },
440 };
441 
442 const AVFilter ff_vsrc_gradients = {
443  .name = "gradients",
444  .description = NULL_IF_CONFIG_SMALL("Draw a gradients."),
445  .priv_size = sizeof(GradientsContext),
446  .priv_class = &gradients_class,
447  .inputs = NULL,
448  FILTER_OUTPUTS(gradients_outputs),
449  FILTER_PIXFMTS(AV_PIX_FMT_RGBA, AV_PIX_FMT_RGBA64, AV_PIX_FMT_GBRAPF32),
450  .activate = activate,
451  .flags = AVFILTER_FLAG_SLICE_THREADS,
452 };
GradientsContext::nb_colors
int nb_colors
Definition: vsrc_gradients.c:43
ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:108
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
draw_gradients_slice32_planar
static int draw_gradients_slice32_planar(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
Definition: vsrc_gradients.c:298
r
const char * r
Definition: vf_curves.c:126
AVERROR
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
opt.h
GradientsContext::pts
int64_t pts
Definition: vsrc_gradients.c:37
av_lfg_init
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:978
ff_vsrc_gradients
const AVFilter ff_vsrc_gradients
Definition: vsrc_gradients.c:442
AVFrame::duration
int64_t duration
Duration of the frame, in the same units as pts.
Definition: frame.h:807
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2964
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
FFERROR_NOT_READY
return FFERROR_NOT_READY
Definition: filter_design.txt:204
AV_OPT_TYPE_VIDEO_RATE
@ AV_OPT_TYPE_VIDEO_RATE
offset must point to AVRational
Definition: opt.h:238
floorf
static __device__ float floorf(float a)
Definition: cuda_runtime.h:172
AV_TIME_BASE_Q
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:264
atan2f
#define atan2f(y, x)
Definition: libm.h:45
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:452
step
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
Definition: rate_distortion.txt:58
lerp_colors
static uint32_t lerp_colors(uint8_t arr[8][4], int nb_colors, int nb_wrap_colors, float step)
Definition: vsrc_gradients.c:118
AVFrame::width
int width
Definition: frame.h:412
w
uint8_t w
Definition: llviddspenc.c:38
AVOption
AVOption.
Definition: opt.h:251
b
#define b
Definition: input.c:41
GradientsContext::lfg
AVLFG lfg
Definition: vsrc_gradients.c:49
AV_OPT_TYPE_DURATION
@ AV_OPT_TYPE_DURATION
Definition: opt.h:239
float.h
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:649
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
c1
static const uint64_t c1
Definition: murmur3.c:52
video.h
lerp_colors16
static uint64_t lerp_colors16(uint8_t arr[8][4], int nb_colors, int nb_wrap_colors, float step)
Definition: vsrc_gradients.c:141
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:361
av_get_random_seed
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
Definition: random_seed.c:167
cosf
#define cosf(x)
Definition: libm.h:78
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
fabsf
static __device__ float fabsf(float a)
Definition: cuda_runtime.h:181
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:47
AVFrame::interlaced_frame
attribute_deprecated int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:530
GradientsContext::y0
int y0
Definition: vsrc_gradients.c:44
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:628
duration
int64_t duration
Definition: movenc.c:64
GradientsContext::fy0
float fy0
Definition: vsrc_gradients.c:45
ff_outlink_set_status
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:189
width
#define width
llrintf
#define llrintf(x)
Definition: libm.h:399
s
#define s(width, name)
Definition: cbs_vp9.c:198
av_lfg_get
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:53
g
const char * g
Definition: vf_curves.c:127
lfg.h
AV_OPT_TYPE_INT64
@ AV_OPT_TYPE_INT64
Definition: opt.h:226
filters.h
gradients_options
static const AVOption gradients_options[]
Definition: vsrc_gradients.c:56
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
AVFrame::key_frame
attribute_deprecated int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:436
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
frame
static AVFrame * frame
Definition: demux_decode.c:54
arg
const char * arg
Definition: jacosubdec.c:67
AV_PIX_FMT_RGBA64
#define AV_PIX_FMT_RGBA64
Definition: pixfmt.h:458
GradientsContext::seed
int64_t seed
Definition: vsrc_gradients.c:47
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
OFFSET
#define OFFSET(x)
Definition: vsrc_gradients.c:53
NULL
#define NULL
Definition: coverity.c:32
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
gradients_outputs
static const AVFilterPad gradients_outputs[]
Definition: vsrc_gradients.c:434
AV_OPT_TYPE_COLOR
@ AV_OPT_TYPE_COLOR
Definition: opt.h:240
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
GradientsContext::duration
int64_t duration
duration expressed in microseconds
Definition: vsrc_gradients.c:38
GradientsContext::y1
int y1
Definition: vsrc_gradients.c:44
sqrtf
static __device__ float sqrtf(float a)
Definition: cuda_runtime.h:184
sinf
#define sinf(x)
Definition: libm.h:419
av_clipf
av_clipf
Definition: af_crystalizer.c:121
inputs
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
Definition: filter_design.txt:243
seed
static unsigned int seed
Definition: videogen.c:78
c
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
GradientsContext::fx0
float fx0
Definition: vsrc_gradients.c:45
GradientsContext::w
int w
Definition: vsrc_gradients.c:34
AVLFG
Context structure for the Lagged Fibonacci PRNG.
Definition: lfg.h:33
f
f
Definition: af_crystalizer.c:121
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:442
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:106
FLAGS
#define FLAGS
Definition: vsrc_gradients.c:54
GradientsContext::h
int h
Definition: vsrc_gradients.c:34
FILTER_PIXFMTS
#define FILTER_PIXFMTS(...)
Definition: internal.h:178
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
GradientsContext::x0
int x0
Definition: vsrc_gradients.c:44
fmaxf
float fmaxf(float, float)
GradientsContext::speed
float speed
Definition: vsrc_gradients.c:39
GradientsContext::x1
int x1
Definition: vsrc_gradients.c:44
height
#define height
a
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:41
draw_gradients_slice
static int draw_gradients_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
Definition: vsrc_gradients.c:250
GradientsContext::fx1
float fx1
Definition: vsrc_gradients.c:45
lerpf
static float lerpf(float a, float b, float x)
Definition: vsrc_gradients.c:91
M_PI
#define M_PI
Definition: mathematics.h:67
GradientsContext::color_rgbaf
float color_rgbaf[8][4]
Definition: vsrc_gradients.c:42
internal.h
AV_OPT_TYPE_FLOAT
@ AV_OPT_TYPE_FLOAT
Definition: opt.h:228
lrintf
#define lrintf(x)
Definition: libm_mips.h:72
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:245
GradientsContext
Definition: vsrc_gradients.c:32
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:786
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:53
AV_FRAME_FLAG_INTERLACED
#define AV_FRAME_FLAG_INTERLACED
A flag to mark frames whose content is interlaced.
Definition: frame.h:636
AVFilter
Filter definition.
Definition: avfilter.h:166
GradientsContext::fy1
float fy1
Definition: vsrc_gradients.c:45
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(gradients)
AVFrame::sample_aspect_ratio
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:447
AVFrame::height
int height
Definition: frame.h:412
random_seed.h
GradientsContext::type
int type
Definition: vsrc_gradients.c:35
lerp_color16
static uint64_t lerp_color16(uint8_t c0[4], uint8_t c1[4], float x)
Definition: vsrc_gradients.c:108
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
AV_PIX_FMT_GBRAPF32
#define AV_PIX_FMT_GBRAPF32
Definition: pixfmt.h:499
lerp_colors32
static void lerp_colors32(float arr[8][4], int nb_colors, int nb_wrap_colors, float step, float *r, float *g, float *b, float *a)
Definition: vsrc_gradients.c:164
AVFilterContext
An instance of a filter.
Definition: avfilter.h:397
factor
static const int factor[16]
Definition: vf_pp7.c:78
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
AVFILTER_FLAG_SLICE_THREADS
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:117
desc
const char * desc
Definition: libsvtav1.c:83
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
GradientsContext::draw_slice
int(* draw_slice)(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
Definition: vsrc_gradients.c:50
GradientsContext::color_rgba
uint8_t color_rgba[8][4]
Definition: vsrc_gradients.c:41
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
project
static float project(float origin_x, float origin_y, float dest_x, float dest_y, float point_x, float point_y, int type)
Definition: vsrc_gradients.c:201
activate
static int activate(AVFilterContext *ctx)
Definition: vsrc_gradients.c:381
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:193
GradientsContext::frame_rate
AVRational frame_rate
Definition: vsrc_gradients.c:36
config_output
static int config_output(AVFilterLink *outlink)
Definition: vsrc_gradients.c:332
imgutils.h
AVERROR_BUG
#define AVERROR_BUG
Internal bug, also see AVERROR_BUG2.
Definition: error.h:52
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:385
ff_outlink_frame_wanted
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function. If this function returns true
av_image_check_size
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:318
ff_filter_execute
static av_always_inline int ff_filter_execute(AVFilterContext *ctx, avfilter_action_func *func, void *arg, int *ret, int nb_jobs)
Definition: internal.h:144
int
int
Definition: ffmpeg_filter.c:368
lerp_color
static uint32_t lerp_color(uint8_t c0[4], uint8_t c1[4], float x)
Definition: vsrc_gradients.c:98
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
draw_gradients_slice16
static int draw_gradients_slice16(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
Definition: vsrc_gradients.c:274
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