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}, 0.00001, 1, FLAGS },
79  {"type", "set gradient type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 3, FLAGS, "type" },
80  {"t", "set gradient type", OFFSET(type), AV_OPT_TYPE_INT, {.i64=0}, 0, 3, FLAGS, "type" },
81  {"linear", "set gradient type", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "type" },
82  {"radial", "set gradient type", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "type" },
83  {"circular", "set gradient type", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "type" },
84  {"spiral", "set gradient type", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, FLAGS, "type" },
85  {NULL},
86 };
87 
88 AVFILTER_DEFINE_CLASS(gradients);
89 
90 static float lerpf(float a, float b, float x)
91 {
92  const float y = 1.f - x;
93 
94  return a * y + b * x;
95 }
96 
97 static uint32_t lerp_color(uint8_t c0[4], uint8_t c1[4], float x)
98 {
99  const float y = 1.f - x;
100 
101  return (lrintf(c0[0] * y + c1[0] * x)) << 0 |
102  (lrintf(c0[1] * y + c1[1] * x)) << 8 |
103  (lrintf(c0[2] * y + c1[2] * x)) << 16 |
104  (lrintf(c0[3] * y + c1[3] * x)) << 24;
105 }
106 
107 static uint64_t lerp_color16(uint8_t c0[4], uint8_t c1[4], float x)
108 {
109  const float y = 1.f - x;
110 
111  return ((uint64_t)llrintf((c0[0] * y + c1[0] * x) * 256)) << 0 |
112  ((uint64_t)llrintf((c0[1] * y + c1[1] * x) * 256)) << 16 |
113  ((uint64_t)llrintf((c0[2] * y + c1[2] * x) * 256)) << 32 |
114  ((uint64_t)llrintf((c0[3] * y + c1[3] * x) * 256)) << 48;
115 }
116 
117 static uint32_t lerp_colors(uint8_t arr[8][4], int nb_colors, int nb_wrap_colors, float step)
118 {
119  float scl;
120  int i, j;
121 
122  if (nb_colors == 1 || step <= 0.0) {
123  return arr[0][0] | (arr[0][1] << 8) | (arr[0][2] << 16) | (arr[0][3] << 24);
124  } else if (step >= 1.0) {
125  i = nb_colors - 1;
126  return arr[i][0] | (arr[i][1] << 8) | (arr[i][2] << 16) | (arr[i][3] << 24);
127  }
128 
129  scl = step * (nb_wrap_colors - 1);
130  i = floorf(scl);
131  j = i + 1;
132  if (i >= nb_colors - 1) {
133  i = nb_colors - 1;
134  j = 0;
135  }
136 
137  return lerp_color(arr[i], arr[j], scl - i);
138 }
139 
140 static uint64_t lerp_colors16(uint8_t arr[8][4], int nb_colors, int nb_wrap_colors, float step)
141 {
142  float scl;
143  int i, j;
144 
145  if (nb_colors == 1 || step <= 0.0) {
146  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);
147  } else if (step >= 1.0) {
148  i = nb_colors - 1;
149  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);
150  }
151 
152  scl = step * (nb_wrap_colors - 1);
153  i = floorf(scl);
154  j = i + 1;
155  if (i >= nb_colors - 1) {
156  i = nb_colors - 1;
157  j = 0;
158  }
159 
160  return lerp_color16(arr[i], arr[j], scl - i);
161 }
162 
163 static void lerp_colors32(float arr[8][4], int nb_colors,
164  int nb_wrap_colors, float step,
165  float *r, float *g, float *b, float *a)
166 {
167  float scl, x;
168  int i, j;
169 
170  if (nb_colors == 1 || step <= 0.0) {
171  *r = arr[0][0];
172  *g = arr[0][1];
173  *b = arr[0][2];
174  *a = arr[0][3];
175  return;
176  } else if (step >= 1.0) {
177  i = nb_colors - 1;
178  *r = arr[i][0];
179  *g = arr[i][1];
180  *b = arr[i][2];
181  *a = arr[i][3];
182  return;
183  }
184 
185  scl = step * (nb_wrap_colors - 1);
186  i = floorf(scl);
187  j = i + 1;
188  if (i >= nb_colors - 1) {
189  i = nb_colors - 1;
190  j = 0;
191  }
192  x = scl - i;
193 
194  *r = lerpf(arr[i][0], arr[j][0], x);
195  *g = lerpf(arr[i][1], arr[j][1], x);
196  *b = lerpf(arr[i][2], arr[j][2], x);
197  *a = lerpf(arr[i][3], arr[j][3], x);
198 }
199 
200 static float project(float origin_x, float origin_y,
201  float dest_x, float dest_y,
202  float point_x, float point_y, int type)
203 {
204  float op_x = point_x - origin_x;
205  float op_y = point_y - origin_y;
206  float od_x = dest_x - origin_x;
207  float od_y = dest_y - origin_y;
208  float op_x_od;
209  float od_s_q;
210 
211  switch (type) {
212  case 0:
213  od_s_q = od_x * od_x + od_y * od_y;
214  break;
215  case 1:
216  od_s_q = sqrtf(od_x * od_x + od_y * od_y);
217  break;
218  case 2:
219  case 3:
220  od_s_q = M_PI * 2.f;
221  break;
222  }
223 
224  switch (type) {
225  case 0:
226  op_x_od = op_x * od_x + op_y * od_y;
227  break;
228  case 1:
229  op_x_od = sqrtf(op_x * op_x + op_y * op_y);
230  break;
231  case 2:
232  op_x_od = atan2f(op_x, op_y) + M_PI;
233  break;
234  case 3:
235  op_x_od = fmodf(atan2f(op_x, op_y) + M_PI + point_x / fmaxf(origin_x, dest_x), 2.f * M_PI);
236  break;
237  }
238 
239  // Normalize and clamp range.
240  return av_clipf(op_x_od / od_s_q, 0.f, 1.f);
241 }
242 
243 static int draw_gradients_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
244 {
245  GradientsContext *s = ctx->priv;
246  AVFrame *frame = arg;
247  const int width = frame->width;
248  const int height = frame->height;
249  const int start = (height * job ) / nb_jobs;
250  const int end = (height * (job+1)) / nb_jobs;
251  const ptrdiff_t linesize = frame->linesize[0] / 4;
252  uint32_t *dst = (uint32_t *)frame->data[0] + start * linesize;
253  const int type = s->type;
254 
255  for (int y = start; y < end; y++) {
256  for (int x = 0; x < width; x++) {
257  float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type);
258  dst[x] = lerp_colors(s->color_rgba, s->nb_colors, s->nb_colors + (type >= 2), factor);
259  }
260 
261  dst += linesize;
262  }
263 
264  return 0;
265 }
266 
267 static int draw_gradients_slice16(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
268 {
269  GradientsContext *s = ctx->priv;
270  AVFrame *frame = arg;
271  const int width = frame->width;
272  const int height = frame->height;
273  const int start = (height * job ) / nb_jobs;
274  const int end = (height * (job+1)) / nb_jobs;
275  const ptrdiff_t linesize = frame->linesize[0] / 8;
276  uint64_t *dst = (uint64_t *)frame->data[0] + start * linesize;
277  const int type = s->type;
278 
279  for (int y = start; y < end; y++) {
280  for (int x = 0; x < width; x++) {
281  float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type);
282  dst[x] = lerp_colors16(s->color_rgba, s->nb_colors, s->nb_colors + (type >= 2), factor);
283  }
284 
285  dst += linesize;
286  }
287 
288  return 0;
289 }
290 
291 static int draw_gradients_slice32_planar(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
292 {
293  GradientsContext *s = ctx->priv;
294  AVFrame *frame = arg;
295  const int width = frame->width;
296  const int height = frame->height;
297  const int start = (height * job ) / nb_jobs;
298  const int end = (height * (job+1)) / nb_jobs;
299  const ptrdiff_t linesize_g = frame->linesize[0] / 4;
300  const ptrdiff_t linesize_b = frame->linesize[1] / 4;
301  const ptrdiff_t linesize_r = frame->linesize[2] / 4;
302  const ptrdiff_t linesize_a = frame->linesize[3] / 4;
303  float *dst_g = (float *)frame->data[0] + start * linesize_g;
304  float *dst_b = (float *)frame->data[1] + start * linesize_b;
305  float *dst_r = (float *)frame->data[2] + start * linesize_r;
306  float *dst_a = (float *)frame->data[3] + start * linesize_a;
307  const int type = s->type;
308 
309  for (int y = start; y < end; y++) {
310  for (int x = 0; x < width; x++) {
311  float factor = project(s->fx0, s->fy0, s->fx1, s->fy1, x, y, type);
312  lerp_colors32(s->color_rgbaf, s->nb_colors, s->nb_colors + (type >= 2), factor,
313  &dst_r[x], &dst_g[x], &dst_b[x], &dst_a[x]);
314  }
315 
316  dst_g += linesize_g;
317  dst_b += linesize_b;
318  dst_r += linesize_r;
319  dst_a += linesize_a;
320  }
321 
322  return 0;
323 }
324 
325 static int config_output(AVFilterLink *outlink)
326 {
327  AVFilterContext *ctx = outlink->src;
328  GradientsContext *s = ctx->priv;
329  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
330 
331  if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
332  return AVERROR(EINVAL);
333 
334  outlink->w = s->w;
335  outlink->h = s->h;
336  outlink->time_base = av_inv_q(s->frame_rate);
337  outlink->sample_aspect_ratio = (AVRational) {1, 1};
338  outlink->frame_rate = s->frame_rate;
339  if (s->seed == -1)
340  s->seed = av_get_random_seed();
341  av_lfg_init(&s->lfg, s->seed);
342 
343  switch (desc->comp[0].depth) {
344  case 8:
345  s->draw_slice = draw_gradients_slice;
346  break;
347  case 16:
348  s->draw_slice = draw_gradients_slice16;
349  break;
350  case 32:
351  s->draw_slice = draw_gradients_slice32_planar;
352  break;
353  default:
354  return AVERROR_BUG;
355  }
356 
357  if (s->x0 < 0 || s->x0 >= s->w)
358  s->x0 = av_lfg_get(&s->lfg) % s->w;
359  if (s->y0 < 0 || s->y0 >= s->h)
360  s->y0 = av_lfg_get(&s->lfg) % s->h;
361  if (s->x1 < 0 || s->x1 >= s->w)
362  s->x1 = av_lfg_get(&s->lfg) % s->w;
363  if (s->y1 < 0 || s->y1 >= s->h)
364  s->y1 = av_lfg_get(&s->lfg) % s->h;
365 
366  for (int n = 0; n < 8; n++) {
367  for (int c = 0; c < 4; c++)
368  s->color_rgbaf[n][c] = s->color_rgba[n][c] / 255.f;
369  }
370 
371  return 0;
372 }
373 
374 static int activate(AVFilterContext *ctx)
375 {
376  GradientsContext *s = ctx->priv;
377  AVFilterLink *outlink = ctx->outputs[0];
378 
379  if (s->duration >= 0 &&
380  av_rescale_q(s->pts, outlink->time_base, AV_TIME_BASE_Q) >= s->duration) {
381  ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
382  return 0;
383  }
384 
385  if (ff_outlink_frame_wanted(outlink)) {
386  AVFrame *frame = ff_get_video_buffer(outlink, s->w, s->h);
387  float angle = fmodf(s->pts * s->speed, 2.f * M_PI);
388  const float w2 = s->w / 2.f;
389  const float h2 = s->h / 2.f;
390 
391  s->fx0 = (s->x0 - w2) * cosf(angle) - (s->y0 - h2) * sinf(angle) + w2;
392  s->fy0 = (s->x0 - w2) * sinf(angle) + (s->y0 - h2) * cosf(angle) + h2;
393 
394  s->fx1 = (s->x1 - w2) * cosf(angle) - (s->y1 - h2) * sinf(angle) + w2;
395  s->fy1 = (s->x1 - w2) * sinf(angle) + (s->y1 - h2) * cosf(angle) + h2;
396 
397  if (!frame)
398  return AVERROR(ENOMEM);
399 
400 #if FF_API_FRAME_KEY
401 FF_DISABLE_DEPRECATION_WARNINGS
402  frame->key_frame = 1;
403 FF_ENABLE_DEPRECATION_WARNINGS
404 #endif
405 
406  frame->flags |= AV_FRAME_FLAG_KEY;
407 #if FF_API_INTERLACED_FRAME
408 FF_DISABLE_DEPRECATION_WARNINGS
409  frame->interlaced_frame = 0;
410 FF_ENABLE_DEPRECATION_WARNINGS
411 #endif
412  frame->flags &= ~AV_FRAME_FLAG_INTERLACED;
413  frame->pict_type = AV_PICTURE_TYPE_I;
414  frame->sample_aspect_ratio = (AVRational) {1, 1};
415  frame->pts = s->pts++;
416  frame->duration = 1;
417 
418  ff_filter_execute(ctx, s->draw_slice, frame, NULL,
419  FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
420 
421  return ff_filter_frame(outlink, frame);
422  }
423 
424  return FFERROR_NOT_READY;
425 }
426 
427 static const AVFilterPad gradients_outputs[] = {
428  {
429  .name = "default",
430  .type = AVMEDIA_TYPE_VIDEO,
431  .config_props = config_output,
432  },
433 };
434 
435 const AVFilter ff_vsrc_gradients = {
436  .name = "gradients",
437  .description = NULL_IF_CONFIG_SMALL("Draw a gradients."),
438  .priv_size = sizeof(GradientsContext),
439  .priv_class = &gradients_class,
440  .inputs = NULL,
441  FILTER_OUTPUTS(gradients_outputs),
442  FILTER_PIXFMTS(AV_PIX_FMT_RGBA, AV_PIX_FMT_RGBA64, AV_PIX_FMT_GBRAPF32),
443  .activate = activate,
444  .flags = AVFILTER_FLAG_SLICE_THREADS,
445 };
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:291
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:435
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:117
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:140
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
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:427
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:243
GradientsContext::fx1
float fx1
Definition: vsrc_gradients.c:45
lerpf
static float lerpf(float a, float b, float x)
Definition: vsrc_gradients.c:90
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:255
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:107
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:163
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:200
activate
static int activate(AVFilterContext *ctx)
Definition: vsrc_gradients.c:374
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:325
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:97
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:267
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