FFmpeg
vf_chromakey.c
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1 /*
2  * Copyright (c) 2015 Timo Rothenpieler <timo@rothenpieler.org>
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/imgutils.h"
23 #include "libavutil/intreadwrite.h"
24 #include "avfilter.h"
25 #include "formats.h"
26 #include "internal.h"
27 #include "video.h"
28 
29 typedef struct ChromakeyContext {
30  const AVClass *class;
31 
32  uint8_t chromakey_rgba[4];
33  uint16_t chromakey_uv[2];
34 
35  float similarity;
36  float blend;
37 
38  int is_yuv;
39  int depth;
40  int mid;
41  int max;
42 
43  int hsub_log2;
44  int vsub_log2;
45 
46  int (*do_slice)(AVFilterContext *ctx, void *arg,
47  int jobnr, int nb_jobs);
48 } ChromakeyContext;
49 
50 static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
51 {
52  double diff = 0.0;
53  int du, dv, i;
54 
55  for (i = 0; i < 9; ++i) {
56  du = (int)u[i] - ctx->chromakey_uv[0];
57  dv = (int)v[i] - ctx->chromakey_uv[1];
58 
59  diff += sqrt((du * du + dv * dv) / (255.0 * 255.0 * 2));
60  }
61 
62  diff /= 9.0;
63 
64  if (ctx->blend > 0.0001) {
65  return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
66  } else {
67  return (diff > ctx->similarity) ? 255 : 0;
68  }
69 }
70 
71 static uint16_t do_chromakey_pixel16(ChromakeyContext *ctx, uint16_t u[9], uint16_t v[9])
72 {
73  double max = ctx->max;
74  double diff = 0.0;
75  int du, dv, i;
76 
77  for (i = 0; i < 9; ++i) {
78  du = (int)u[i] - ctx->chromakey_uv[0];
79  dv = (int)v[i] - ctx->chromakey_uv[1];
80 
81  diff += sqrt((du * du + dv * dv) / (max * max * 2));
82  }
83 
84  diff /= 9.0;
85 
86  if (ctx->blend > 0.0001) {
87  return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * max;
88  } else {
89  return (diff > ctx->similarity) ? max : 0;
90  }
91 }
92 
93 static av_always_inline void get_pixel_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t *u, uint8_t *v)
94 {
95  if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
96  return;
97 
98  x >>= hsub_log2;
99  y >>= vsub_log2;
100 
101  *u = frame->data[1][frame->linesize[1] * y + x];
102  *v = frame->data[2][frame->linesize[2] * y + x];
103 }
104 
105 static av_always_inline void get_pixel16_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint16_t *u, uint16_t *v)
106 {
107  if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
108  return;
109 
110  x >>= hsub_log2;
111  y >>= vsub_log2;
112 
113  *u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
114  *v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
115 }
116 
117 static int do_chromakey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
118 {
119  AVFrame *frame = arg;
120 
121  const int slice_start = (frame->height * jobnr) / nb_jobs;
122  const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
123 
124  ChromakeyContext *ctx = avctx->priv;
125 
126  int x, y, xo, yo;
127  uint8_t u[9], v[9];
128 
129  memset(u, ctx->chromakey_uv[0], sizeof(u));
130  memset(v, ctx->chromakey_uv[1], sizeof(v));
131 
132  for (y = slice_start; y < slice_end; ++y) {
133  for (x = 0; x < frame->width; ++x) {
134  for (yo = 0; yo < 3; ++yo) {
135  for (xo = 0; xo < 3; ++xo) {
136  get_pixel_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
137  }
138  }
139 
140  frame->data[3][frame->linesize[3] * y + x] = do_chromakey_pixel(ctx, u, v);
141  }
142  }
143 
144  return 0;
145 }
146 
147 static int do_chromakey16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
148 {
149  AVFrame *frame = arg;
150 
151  const int slice_start = (frame->height * jobnr) / nb_jobs;
152  const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
153 
154  ChromakeyContext *ctx = avctx->priv;
155 
156  int x, y, xo, yo;
157  uint16_t u[9], v[9];
158 
159  for (int i = 0; i < 9; i++) {
160  u[i] = ctx->chromakey_uv[0];
161  v[i] = ctx->chromakey_uv[1];
162  }
163 
164  for (y = slice_start; y < slice_end; ++y) {
165  for (x = 0; x < frame->width; ++x) {
166  uint16_t *dst = (uint16_t *)(frame->data[3] + frame->linesize[3] * y);
167 
168  for (yo = 0; yo < 3; ++yo) {
169  for (xo = 0; xo < 3; ++xo) {
170  get_pixel16_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
171  }
172  }
173 
174  dst[x] = do_chromakey_pixel16(ctx, u, v);
175  }
176  }
177 
178  return 0;
179 }
180 
181 static int do_chromahold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
182 {
183  ChromakeyContext *ctx = avctx->priv;
184  AVFrame *frame = arg;
185  const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
186  const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
187 
188  int x, y, alpha;
189 
190  for (y = slice_start; y < slice_end; ++y) {
191  for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
192  int u = frame->data[1][frame->linesize[1] * y + x];
193  int v = frame->data[2][frame->linesize[2] * y + x];
194  double diff;
195  int du, dv;
196 
197  du = u - ctx->chromakey_uv[0];
198  dv = v - ctx->chromakey_uv[1];
199 
200  diff = sqrt((du * du + dv * dv) / (255.0 * 255.0 * 2.0));
201 
202  alpha = diff > ctx->similarity;
203  if (ctx->blend > 0.0001) {
204  double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
205 
206  frame->data[1][frame->linesize[1] * y + x] = 128 + (u - 128) * f;
207  frame->data[2][frame->linesize[2] * y + x] = 128 + (v - 128) * f;
208  } else if (alpha) {
209  frame->data[1][frame->linesize[1] * y + x] = 128;
210  frame->data[2][frame->linesize[2] * y + x] = 128;
211  }
212  }
213  }
214 
215  return 0;
216 }
217 
218 static int do_chromahold16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
219 {
220  ChromakeyContext *ctx = avctx->priv;
221  AVFrame *frame = arg;
222  const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
223  const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
224  const int mid = ctx->mid;
225  double max = ctx->max;
226 
227  int x, y, alpha;
228 
229  for (y = slice_start; y < slice_end; ++y) {
230  for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
231  int u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
232  int v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
233  double diff;
234  int du, dv;
235 
236  du = u - ctx->chromakey_uv[0];
237  dv = v - ctx->chromakey_uv[1];
238 
239  diff = sqrt((du * du + dv * dv) / (max * max * 2.0));
240 
241  alpha = diff > ctx->similarity;
242  if (ctx->blend > 0.0001) {
243  double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
244 
245  AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid + (u - mid) * f);
246  AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid + (v - mid) * f);
247  } else if (alpha) {
248  AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid);
249  AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid);
250  }
251  }
252  }
253 
254  return 0;
255 }
256 
257 static int filter_frame(AVFilterLink *link, AVFrame *frame)
258 {
259  AVFilterContext *avctx = link->dst;
260  ChromakeyContext *ctx = avctx->priv;
261  int res;
262 
263  if (res = ff_filter_execute(avctx, ctx->do_slice, frame, NULL,
264  FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
265  return res;
266 
267  return ff_filter_frame(avctx->outputs[0], frame);
268 }
269 
270 #define FIXNUM(x) lrint((x) * (1 << 10))
271 #define RGB_TO_U(rgb) (((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
272 #define RGB_TO_V(rgb) ((( FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
273 
274 static av_cold int config_output(AVFilterLink *outlink)
275 {
276  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
277  AVFilterContext *avctx = outlink->src;
278  ChromakeyContext *ctx = avctx->priv;
279  int factor;
280 
281  ctx->depth = desc->comp[0].depth;
282  ctx->mid = 1 << (ctx->depth - 1);
283  ctx->max = (1 << ctx->depth) - 1;
284 
285  factor = 1 << (ctx->depth - 8);
286 
287  if (ctx->is_yuv) {
288  ctx->chromakey_uv[0] = ctx->chromakey_rgba[1] * factor;
289  ctx->chromakey_uv[1] = ctx->chromakey_rgba[2] * factor;
290  } else {
291  ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba) * factor;
292  ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba) * factor;
293  }
294 
295  if (!strcmp(avctx->filter->name, "chromakey")) {
296  ctx->do_slice = ctx->depth <= 8 ? do_chromakey_slice : do_chromakey16_slice;
297  } else {
298  ctx->do_slice = ctx->depth <= 8 ? do_chromahold_slice: do_chromahold16_slice;
299  }
300 
301  return 0;
302 }
303 
304 static av_cold int config_input(AVFilterLink *inlink)
305 {
306  AVFilterContext *avctx = inlink->dst;
307  ChromakeyContext *ctx = avctx->priv;
308  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
309 
310  ctx->hsub_log2 = desc->log2_chroma_w;
311  ctx->vsub_log2 = desc->log2_chroma_h;
312 
313  return 0;
314 }
315 
316 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
317  char *res, int res_len, int flags)
318 {
319  int ret;
320 
321  ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
322  if (ret < 0)
323  return ret;
324 
325  return config_output(ctx->outputs[0]);
326 }
327 
328 static const AVFilterPad chromakey_inputs[] = {
329  {
330  .name = "default",
331  .type = AVMEDIA_TYPE_VIDEO,
332  .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
333  .filter_frame = filter_frame,
334  .config_props = config_input,
335  },
336 };
337 
338 static const AVFilterPad chromakey_outputs[] = {
339  {
340  .name = "default",
341  .type = AVMEDIA_TYPE_VIDEO,
342  .config_props = config_output,
343  },
344 };
345 
346 #define OFFSET(x) offsetof(ChromakeyContext, x)
347 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
348 
349 static const AVOption chromakey_options[] = {
350  { "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
351  { "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
352  { "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
353  { "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
354  { NULL }
355 };
356 
357 static const enum AVPixelFormat chromakey_fmts[] = {
358  AV_PIX_FMT_YUVA420P,
359  AV_PIX_FMT_YUVA422P,
360  AV_PIX_FMT_YUVA444P,
361  AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
362  AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
363  AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
364  AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
365  AV_PIX_FMT_NONE
366 };
367 
368 AVFILTER_DEFINE_CLASS(chromakey);
369 
370 const AVFilter ff_vf_chromakey = {
371  .name = "chromakey",
372  .description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."),
373  .priv_size = sizeof(ChromakeyContext),
374  .priv_class = &chromakey_class,
375  FILTER_INPUTS(chromakey_inputs),
376  FILTER_OUTPUTS(chromakey_outputs),
377  FILTER_PIXFMTS_ARRAY(chromakey_fmts),
378  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
379  .process_command = process_command,
380 };
381 
382 static const AVOption chromahold_options[] = {
383  { "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, 0, 0, FLAGS },
384  { "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
385  { "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
386  { "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
387  { NULL }
388 };
389 
390 static const AVFilterPad chromahold_inputs[] = {
391  {
392  .name = "default",
393  .type = AVMEDIA_TYPE_VIDEO,
394  .flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
395  .filter_frame = filter_frame,
396  .config_props = config_input,
397  },
398 };
399 
400 static const AVFilterPad chromahold_outputs[] = {
401  {
402  .name = "default",
403  .type = AVMEDIA_TYPE_VIDEO,
404  .config_props = config_output,
405  },
406 };
407 
408 static const enum AVPixelFormat hold_pixel_fmts[] = {
409  AV_PIX_FMT_YUV420P,
410  AV_PIX_FMT_YUV422P,
411  AV_PIX_FMT_YUV444P,
412  AV_PIX_FMT_YUVA420P,
413  AV_PIX_FMT_YUVA422P,
414  AV_PIX_FMT_YUVA444P,
415  AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
416  AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
417  AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
418  AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
419  AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
420  AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
421  AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
422  AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
423  AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
424  AV_PIX_FMT_NONE
425 };
426 
427 AVFILTER_DEFINE_CLASS(chromahold);
428 
429 const AVFilter ff_vf_chromahold = {
430  .name = "chromahold",
431  .description = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray."),
432  .priv_size = sizeof(ChromakeyContext),
433  .priv_class = &chromahold_class,
434  FILTER_INPUTS(chromahold_inputs),
435  FILTER_OUTPUTS(chromahold_outputs),
436  FILTER_PIXFMTS_ARRAY(hold_pixel_fmts),
437  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
438  .process_command = process_command,
439 };
AV_PIX_FMT_YUVA422P16
#define AV_PIX_FMT_YUVA422P16
Definition: pixfmt.h:447
AVPixelFormat
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Pixel format.
Definition: pixfmt.h:64
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static av_cold int config_input(AVFilterLink *inlink)
Definition: vf_chromakey.c:304
ChromakeyContext::do_slice
int(* do_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_chromakey.c:46
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#define RGB_TO_V(rgb)
Definition: vf_chromakey.c:272
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Definition: cbs_h2645.c:264
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int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1018
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const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2660
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#define FILTER_PIXFMTS_ARRAY(array)
Definition: internal.h:171
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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
Definition: filter_design.txt:212
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static const AVFilterPad chromakey_outputs[]
Definition: vf_chromakey.c:338
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#define AV_RN16(p)
Definition: intreadwrite.h:360
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#define AV_PIX_FMT_YUVA422P9
Definition: pixfmt.h:439
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This structure describes decoded (raw) audio or video data.
Definition: frame.h:317
AV_PIX_FMT_YUVA420P16
#define AV_PIX_FMT_YUVA420P16
Definition: pixfmt.h:446
AV_PIX_FMT_YUVA420P10
#define AV_PIX_FMT_YUVA420P10
Definition: pixfmt.h:441
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Definition: opt.h:247
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Definition: vf_chromakey.c:390
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#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:404
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Definition: cuda_runtime.h:33
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const char * name
Filter name.
Definition: avfilter.h:169
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uint16_t chromakey_uv[2]
Definition: vf_chromakey.c:33
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#define AV_PIX_FMT_YUVA422P10
Definition: pixfmt.h:442
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static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
Definition: vf_chromakey.c:50
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int max
Definition: vf_chromakey.c:41
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Definition: pixfmt.h:438
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static const AVOption chromahold_options[]
Definition: vf_chromakey.c:382
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void * priv
private data for use by the filter
Definition: avfilter.h:417
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#define AV_PIX_FMT_YUVA444P16
Definition: pixfmt.h:448
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Definition: vf_chromakey.c:40
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Definition: pixfmt.h:402
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Definition: vf_chromakey.c:39
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A filter pad used for either input or output.
Definition: internal.h:50
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#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:407
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Definition: attributes.h:90
AV_PIX_FMT_YUV422P16
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:416
ChromakeyContext::is_yuv
int is_yuv
Definition: vf_chromakey.c:38
intreadwrite.h
get_pixel16_uv
static av_always_inline void get_pixel16_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint16_t *u, uint16_t *v)
Definition: vf_chromakey.c:105
AV_PIX_FMT_YUVA420P
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
AV_PIX_FMT_YUV444P16
#define AV_PIX_FMT_YUV444P16
Definition: pixfmt.h:417
ChromakeyContext
Definition: vf_chromakey.c:29
slice_end
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2042
AV_PIX_FMT_YUVA444P12
#define AV_PIX_FMT_YUVA444P12
Definition: pixfmt.h:445
AV_PIX_FMT_YUV420P9
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:401
AV_PIX_FMT_YUV420P16
#define AV_PIX_FMT_YUV420P16
Definition: pixfmt.h:415
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
f
#define f(width, name)
Definition: cbs_vp9.c:255
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:191
link
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 link
Definition: filter_design.txt:23
arg
const char * arg
Definition: jacosubdec.c:67
chromakey_options
static const AVOption chromakey_options[]
Definition: vf_chromakey.c:349
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
AV_OPT_TYPE_COLOR
@ AV_OPT_TYPE_COLOR
Definition: opt.h:239
ChromakeyContext::blend
float blend
Definition: vf_chromakey.c:36
process_command
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: vf_chromakey.c:316
AV_PIX_FMT_YUV422P10
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:405
chromahold_outputs
static const AVFilterPad chromahold_outputs[]
Definition: vf_chromakey.c:400
filter_frame
static int filter_frame(AVFilterLink *link, AVFrame *frame)
Definition: vf_chromakey.c:257
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:117
av_clipd
#define av_clipd
Definition: common.h:147
AV_PIX_FMT_YUV422P12
#define AV_PIX_FMT_YUV422P12
Definition: pixfmt.h:409
do_chromahold16_slice
static int do_chromahold16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_chromakey.c:218
ChromakeyContext::chromakey_rgba
uint8_t chromakey_rgba[4]
Definition: vf_chromakey.c:32
do_chromakey16_slice
static int do_chromakey16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_chromakey.c:147
RGB_TO_U
#define RGB_TO_U(rgb)
Definition: vf_chromakey.c:271
do_chromakey_pixel16
static uint16_t do_chromakey_pixel16(ChromakeyContext *ctx, uint16_t u[9], uint16_t v[9])
Definition: vf_chromakey.c:71
AV_PIX_FMT_YUV444P12
#define AV_PIX_FMT_YUV444P12
Definition: pixfmt.h:411
ff_filter_process_command
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options.
Definition: avfilter.c:882
chromakey_inputs
static const AVFilterPad chromakey_inputs[]
Definition: vf_chromakey.c:328
AV_PIX_FMT_YUVA444P
@ AV_PIX_FMT_YUVA444P
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:167
AV_PIX_FMT_YUVA444P10
#define AV_PIX_FMT_YUVA444P10
Definition: pixfmt.h:443
internal.h
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#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:146
AV_OPT_TYPE_FLOAT
@ AV_OPT_TYPE_FLOAT
Definition: opt.h:227
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:803
av_always_inline
#define av_always_inline
Definition: attributes.h:49
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
AV_PIX_FMT_YUV444P9
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:403
get_pixel_uv
static av_always_inline void get_pixel_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t *u, uint8_t *v)
Definition: vf_chromakey.c:93
AVFilter
Filter definition.
Definition: avfilter.h:165
hold_pixel_fmts
static enum AVPixelFormat hold_pixel_fmts[]
Definition: vf_chromakey.c:408
ret
ret
Definition: filter_design.txt:187
frame
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 the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AV_PIX_FMT_YUVA444P9
#define AV_PIX_FMT_YUVA444P9
Definition: pixfmt.h:440
AV_PIX_FMT_YUV420P12
#define AV_PIX_FMT_YUV420P12
Definition: pixfmt.h:408
AV_PIX_FMT_YUV422P14
#define AV_PIX_FMT_YUV422P14
Definition: pixfmt.h:413
ff_vf_chromakey
const AVFilter ff_vf_chromakey
Definition: vf_chromakey.c:370
do_chromakey_slice
static int do_chromakey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_chromakey.c:117
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AV_PIX_FMT_YUVA422P12
#define AV_PIX_FMT_YUVA422P12
Definition: pixfmt.h:444
avfilter.h
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
AVFilterContext
An instance of a filter.
Definition: avfilter.h:402
factor
static const int factor[16]
Definition: vf_pp7.c:76
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:121
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
OFFSET
#define OFFSET(x)
Definition: vf_chromakey.c:346
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
diff
static av_always_inline int diff(const uint32_t a, const uint32_t b)
Definition: vf_palettegen.c:139
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:241
do_chromahold_slice
static int do_chromahold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_chromakey.c:181
FLAGS
#define FLAGS
Definition: vf_chromakey.c:347
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:192
ChromakeyContext::vsub_log2
int vsub_log2
Definition: vf_chromakey.c:44
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
ff_vf_chromahold
const AVFilter ff_vf_chromahold
Definition: vf_chromakey.c:429
ChromakeyContext::similarity
float similarity
Definition: vf_chromakey.c:35
AV_PIX_FMT_YUV444P14
#define AV_PIX_FMT_YUV444P14
Definition: pixfmt.h:414
chromakey_fmts
static enum AVPixelFormat chromakey_fmts[]
Definition: vf_chromakey.c:357
AVFilterContext::filter
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:405
ChromakeyContext::hsub_log2
int hsub_log2
Definition: vf_chromakey.c:43
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:143
int
int
Definition: ffmpeg_filter.c:153
config_output
static av_cold int config_output(AVFilterLink *outlink)
Definition: vf_chromakey.c:274
AV_PIX_FMT_YUVA422P
@ AV_PIX_FMT_YUVA422P
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:166
AV_PIX_FMT_YUV420P14
#define AV_PIX_FMT_YUV420P14
Definition: pixfmt.h:412
AVFilterContext::outputs
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:414
AVFILTERPAD_FLAG_NEEDS_WRITABLE
#define AVFILTERPAD_FLAG_NEEDS_WRITABLE
The filter expects writable frames from its input link, duplicating data buffers if needed.
Definition: internal.h:69
AV_WN16
#define AV_WN16(p, v)
Definition: intreadwrite.h:372
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