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vf_overlay.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
3  * Copyright (c) 2010 Baptiste Coudurier
4  * Copyright (c) 2007 Bobby Bingham
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * overlay one video on top of another
26  */
27 
28 #include "avfilter.h"
29 #include "formats.h"
30 #include "libavutil/common.h"
31 #include "libavutil/eval.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/imgutils.h"
35 #include "libavutil/mathematics.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/timestamp.h"
38 #include "internal.h"
39 #include "drawutils.h"
40 #include "framesync.h"
41 #include "video.h"
42 
43 static const char *const var_names[] = {
44  "main_w", "W", ///< width of the main video
45  "main_h", "H", ///< height of the main video
46  "overlay_w", "w", ///< width of the overlay video
47  "overlay_h", "h", ///< height of the overlay video
48  "hsub",
49  "vsub",
50  "x",
51  "y",
52  "n", ///< number of frame
53  "pos", ///< position in the file
54  "t", ///< timestamp expressed in seconds
55  NULL
56 };
57 
58 enum var_name {
71 };
72 
73 #define MAIN 0
74 #define OVERLAY 1
75 
76 #define R 0
77 #define G 1
78 #define B 2
79 #define A 3
80 
81 #define Y 0
82 #define U 1
83 #define V 2
84 
85 enum EvalMode {
89 };
90 
99 };
100 
101 typedef struct OverlayContext {
102  const AVClass *class;
103  int x, y; ///< position of overlaid picture
104 
111  int format; ///< OverlayFormat
112  int eval_mode; ///< EvalMode
113 
115 
116  int main_pix_step[4]; ///< steps per pixel for each plane of the main output
117  int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
118  int hsub, vsub; ///< chroma subsampling values
119  const AVPixFmtDescriptor *main_desc; ///< format descriptor for main input
120 
122  char *x_expr, *y_expr;
123 
125 
126  void (*blend_image)(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y);
128 
130 {
131  OverlayContext *s = ctx->priv;
132 
133  ff_framesync_uninit(&s->fs);
134  av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
135  av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
136 }
137 
138 static inline int normalize_xy(double d, int chroma_sub)
139 {
140  if (isnan(d))
141  return INT_MAX;
142  return (int)d & ~((1 << chroma_sub) - 1);
143 }
144 
146 {
147  OverlayContext *s = ctx->priv;
148 
152  s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
153  s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
154 }
155 
156 static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
157 {
158  int ret;
159  AVExpr *old = NULL;
160 
161  if (*pexpr)
162  old = *pexpr;
163  ret = av_expr_parse(pexpr, expr, var_names,
164  NULL, NULL, NULL, NULL, 0, log_ctx);
165  if (ret < 0) {
166  av_log(log_ctx, AV_LOG_ERROR,
167  "Error when evaluating the expression '%s' for %s\n",
168  expr, option);
169  *pexpr = old;
170  return ret;
171  }
172 
173  av_expr_free(old);
174  return 0;
175 }
176 
177 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
178  char *res, int res_len, int flags)
179 {
180  OverlayContext *s = ctx->priv;
181  int ret;
182 
183  if (!strcmp(cmd, "x"))
184  ret = set_expr(&s->x_pexpr, args, cmd, ctx);
185  else if (!strcmp(cmd, "y"))
186  ret = set_expr(&s->y_pexpr, args, cmd, ctx);
187  else
188  ret = AVERROR(ENOSYS);
189 
190  if (ret < 0)
191  return ret;
192 
193  if (s->eval_mode == EVAL_MODE_INIT) {
194  eval_expr(ctx);
195  av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
196  s->var_values[VAR_X], s->x,
197  s->var_values[VAR_Y], s->y);
198  }
199  return ret;
200 }
201 
202 static const enum AVPixelFormat alpha_pix_fmts[] = {
206 };
207 
209 {
210  OverlayContext *s = ctx->priv;
211 
212  /* overlay formats contains alpha, for avoiding conversion with alpha information loss */
213  static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
217  };
218  static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
220  };
221 
222  static const enum AVPixelFormat main_pix_fmts_yuv422[] = {
224  };
225  static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = {
227  };
228 
229  static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
231  };
232  static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
234  };
235 
236  static const enum AVPixelFormat main_pix_fmts_gbrp[] = {
238  };
239  static const enum AVPixelFormat overlay_pix_fmts_gbrp[] = {
241  };
242 
243  static const enum AVPixelFormat main_pix_fmts_rgb[] = {
248  };
249  static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
253  };
254 
255  AVFilterFormats *main_formats = NULL;
256  AVFilterFormats *overlay_formats = NULL;
257  int ret;
258 
259  switch (s->format) {
261  if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv420)) ||
262  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420))) {
263  ret = AVERROR(ENOMEM);
264  goto fail;
265  }
266  break;
268  if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv422)) ||
269  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422))) {
270  ret = AVERROR(ENOMEM);
271  goto fail;
272  }
273  break;
275  if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv444)) ||
276  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444))) {
277  ret = AVERROR(ENOMEM);
278  goto fail;
279  }
280  break;
281  case OVERLAY_FORMAT_RGB:
282  if (!(main_formats = ff_make_format_list(main_pix_fmts_rgb)) ||
283  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb))) {
284  ret = AVERROR(ENOMEM);
285  goto fail;
286  }
287  break;
288  case OVERLAY_FORMAT_GBRP:
289  if (!(main_formats = ff_make_format_list(main_pix_fmts_gbrp)) ||
290  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_gbrp))) {
291  ret = AVERROR(ENOMEM);
292  goto fail;
293  }
294  break;
295  case OVERLAY_FORMAT_AUTO:
296  if (!(main_formats = ff_make_format_list(alpha_pix_fmts))) {
297  ret = AVERROR(ENOMEM);
298  goto fail;
299  }
300  break;
301  default:
302  av_assert0(0);
303  }
304 
305  if (s->format == OVERLAY_FORMAT_AUTO) {
306  ret = ff_set_common_formats(ctx, main_formats);
307  if (ret < 0)
308  goto fail;
309  } else {
310  if ((ret = ff_formats_ref(main_formats , &ctx->inputs[MAIN]->out_formats )) < 0 ||
311  (ret = ff_formats_ref(overlay_formats, &ctx->inputs[OVERLAY]->out_formats)) < 0 ||
312  (ret = ff_formats_ref(main_formats , &ctx->outputs[MAIN]->in_formats )) < 0)
313  goto fail;
314  }
315 
316  return 0;
317 fail:
318  if (main_formats)
319  av_freep(&main_formats->formats);
320  av_freep(&main_formats);
321  if (overlay_formats)
322  av_freep(&overlay_formats->formats);
323  av_freep(&overlay_formats);
324  return ret;
325 }
326 
328 {
329  AVFilterContext *ctx = inlink->dst;
330  OverlayContext *s = inlink->dst->priv;
331  int ret;
332  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
333 
335 
336  /* Finish the configuration by evaluating the expressions
337  now when both inputs are configured. */
338  s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
339  s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
342  s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
343  s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
344  s->var_values[VAR_X] = NAN;
345  s->var_values[VAR_Y] = NAN;
346  s->var_values[VAR_N] = 0;
347  s->var_values[VAR_T] = NAN;
348  s->var_values[VAR_POS] = NAN;
349 
350  if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
351  (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
352  return ret;
353 
355  ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
357 
358  if (s->eval_mode == EVAL_MODE_INIT) {
359  eval_expr(ctx);
360  av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
361  s->var_values[VAR_X], s->x,
362  s->var_values[VAR_Y], s->y);
363  }
364 
365  av_log(ctx, AV_LOG_VERBOSE,
366  "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s\n",
367  ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
369  ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
371  return 0;
372 }
373 
374 static int config_output(AVFilterLink *outlink)
375 {
376  AVFilterContext *ctx = outlink->src;
377  OverlayContext *s = ctx->priv;
378  int ret;
379 
380  if ((ret = ff_framesync_init_dualinput(&s->fs, ctx)) < 0)
381  return ret;
382 
383  outlink->w = ctx->inputs[MAIN]->w;
384  outlink->h = ctx->inputs[MAIN]->h;
385  outlink->time_base = ctx->inputs[MAIN]->time_base;
386 
387  return ff_framesync_configure(&s->fs);
388 }
389 
390 // divide by 255 and round to nearest
391 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
392 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
393 
394 // calculate the unpremultiplied alpha, applying the general equation:
395 // alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
396 // (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
397 // ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
398 #define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
399 
400 /**
401  * Blend image in src to destination buffer dst at position (x, y).
402  */
403 
405  AVFrame *dst, const AVFrame *src,
406  int main_has_alpha, int x, int y)
407 {
408  OverlayContext *s = ctx->priv;
409  int i, imax, j, jmax;
410  const int src_w = src->width;
411  const int src_h = src->height;
412  const int dst_w = dst->width;
413  const int dst_h = dst->height;
414  uint8_t alpha; ///< the amount of overlay to blend on to main
415  const int dr = s->main_rgba_map[R];
416  const int dg = s->main_rgba_map[G];
417  const int db = s->main_rgba_map[B];
418  const int da = s->main_rgba_map[A];
419  const int dstep = s->main_pix_step[0];
420  const int sr = s->overlay_rgba_map[R];
421  const int sg = s->overlay_rgba_map[G];
422  const int sb = s->overlay_rgba_map[B];
423  const int sa = s->overlay_rgba_map[A];
424  const int sstep = s->overlay_pix_step[0];
425  uint8_t *S, *sp, *d, *dp;
426 
427  i = FFMAX(-y, 0);
428  sp = src->data[0] + i * src->linesize[0];
429  dp = dst->data[0] + (y+i) * dst->linesize[0];
430 
431  for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
432  j = FFMAX(-x, 0);
433  S = sp + j * sstep;
434  d = dp + (x+j) * dstep;
435 
436  for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
437  alpha = S[sa];
438 
439  // if the main channel has an alpha channel, alpha has to be calculated
440  // to create an un-premultiplied (straight) alpha value
441  if (main_has_alpha && alpha != 0 && alpha != 255) {
442  uint8_t alpha_d = d[da];
443  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
444  }
445 
446  switch (alpha) {
447  case 0:
448  break;
449  case 255:
450  d[dr] = S[sr];
451  d[dg] = S[sg];
452  d[db] = S[sb];
453  break;
454  default:
455  // main_value = main_value * (1 - alpha) + overlay_value * alpha
456  // since alpha is in the range 0-255, the result must divided by 255
457  d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + S[sr] * alpha);
458  d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + S[sg] * alpha);
459  d[db] = FAST_DIV255(d[db] * (255 - alpha) + S[sb] * alpha);
460  }
461  if (main_has_alpha) {
462  switch (alpha) {
463  case 0:
464  break;
465  case 255:
466  d[da] = S[sa];
467  break;
468  default:
469  // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
470  d[da] += FAST_DIV255((255 - d[da]) * S[sa]);
471  }
472  }
473  d += dstep;
474  S += sstep;
475  }
476  dp += dst->linesize[0];
477  sp += src->linesize[0];
478  }
479 }
480 
482  AVFrame *dst, const AVFrame *src,
483  int src_w, int src_h,
484  int dst_w, int dst_h,
485  int i, int hsub, int vsub,
486  int x, int y,
487  int main_has_alpha,
488  int dst_plane,
489  int dst_offset,
490  int dst_step)
491 {
492  int src_wp = AV_CEIL_RSHIFT(src_w, hsub);
493  int src_hp = AV_CEIL_RSHIFT(src_h, vsub);
494  int dst_wp = AV_CEIL_RSHIFT(dst_w, hsub);
495  int dst_hp = AV_CEIL_RSHIFT(dst_h, vsub);
496  int yp = y>>vsub;
497  int xp = x>>hsub;
498  uint8_t *s, *sp, *d, *dp, *dap, *a, *da, *ap;
499  int jmax, j, k, kmax;
500 
501  j = FFMAX(-yp, 0);
502  sp = src->data[i] + j * src->linesize[i];
503  dp = dst->data[dst_plane]
504  + (yp+j) * dst->linesize[dst_plane]
505  + dst_offset;
506  ap = src->data[3] + (j<<vsub) * src->linesize[3];
507  dap = dst->data[3] + ((yp+j) << vsub) * dst->linesize[3];
508 
509  for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
510  k = FFMAX(-xp, 0);
511  d = dp + (xp+k) * dst_step;
512  s = sp + k;
513  a = ap + (k<<hsub);
514  da = dap + ((xp+k) << hsub);
515 
516  for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
517  int alpha_v, alpha_h, alpha;
518 
519  // average alpha for color components, improve quality
520  if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
521  alpha = (a[0] + a[src->linesize[3]] +
522  a[1] + a[src->linesize[3]+1]) >> 2;
523  } else if (hsub || vsub) {
524  alpha_h = hsub && k+1 < src_wp ?
525  (a[0] + a[1]) >> 1 : a[0];
526  alpha_v = vsub && j+1 < src_hp ?
527  (a[0] + a[src->linesize[3]]) >> 1 : a[0];
528  alpha = (alpha_v + alpha_h) >> 1;
529  } else
530  alpha = a[0];
531  // if the main channel has an alpha channel, alpha has to be calculated
532  // to create an un-premultiplied (straight) alpha value
533  if (main_has_alpha && alpha != 0 && alpha != 255) {
534  // average alpha for color components, improve quality
535  uint8_t alpha_d;
536  if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
537  alpha_d = (da[0] + da[dst->linesize[3]] +
538  da[1] + da[dst->linesize[3]+1]) >> 2;
539  } else if (hsub || vsub) {
540  alpha_h = hsub && k+1 < src_wp ?
541  (da[0] + da[1]) >> 1 : da[0];
542  alpha_v = vsub && j+1 < src_hp ?
543  (da[0] + da[dst->linesize[3]]) >> 1 : da[0];
544  alpha_d = (alpha_v + alpha_h) >> 1;
545  } else
546  alpha_d = da[0];
547  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
548  }
549  *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
550  s++;
551  d += dst_step;
552  da += 1 << hsub;
553  a += 1 << hsub;
554  }
555  dp += dst->linesize[dst_plane];
556  sp += src->linesize[i];
557  ap += (1 << vsub) * src->linesize[3];
558  dap += (1 << vsub) * dst->linesize[3];
559  }
560 }
561 
562 static inline void alpha_composite(const AVFrame *src, const AVFrame *dst,
563  int src_w, int src_h,
564  int dst_w, int dst_h,
565  int x, int y)
566 {
567  uint8_t alpha; ///< the amount of overlay to blend on to main
568  uint8_t *s, *sa, *d, *da;
569  int i, imax, j, jmax;
570 
571  i = FFMAX(-y, 0);
572  sa = src->data[3] + i * src->linesize[3];
573  da = dst->data[3] + (y+i) * dst->linesize[3];
574 
575  for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
576  j = FFMAX(-x, 0);
577  s = sa + j;
578  d = da + x+j;
579 
580  for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
581  alpha = *s;
582  if (alpha != 0 && alpha != 255) {
583  uint8_t alpha_d = *d;
584  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
585  }
586  switch (alpha) {
587  case 0:
588  break;
589  case 255:
590  *d = *s;
591  break;
592  default:
593  // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
594  *d += FAST_DIV255((255 - *d) * *s);
595  }
596  d += 1;
597  s += 1;
598  }
599  da += dst->linesize[3];
600  sa += src->linesize[3];
601  }
602 }
603 
605  AVFrame *dst, const AVFrame *src,
606  int hsub, int vsub,
607  int main_has_alpha,
608  int x, int y)
609 {
610  OverlayContext *s = ctx->priv;
611  const int src_w = src->width;
612  const int src_h = src->height;
613  const int dst_w = dst->width;
614  const int dst_h = dst->height;
615 
616  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha,
617  s->main_desc->comp[0].plane, s->main_desc->comp[0].offset, s->main_desc->comp[0].step);
618  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha,
619  s->main_desc->comp[1].plane, s->main_desc->comp[1].offset, s->main_desc->comp[1].step);
620  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha,
621  s->main_desc->comp[2].plane, s->main_desc->comp[2].offset, s->main_desc->comp[2].step);
622 
623  if (main_has_alpha)
624  alpha_composite(src, dst, src_w, src_h, dst_w, dst_h, x, y);
625 }
626 
628  AVFrame *dst, const AVFrame *src,
629  int hsub, int vsub,
630  int main_has_alpha,
631  int x, int y)
632 {
633  OverlayContext *s = ctx->priv;
634  const int src_w = src->width;
635  const int src_h = src->height;
636  const int dst_w = dst->width;
637  const int dst_h = dst->height;
638 
639  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha,
640  s->main_desc->comp[1].plane, s->main_desc->comp[1].offset, s->main_desc->comp[1].step);
641  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha,
642  s->main_desc->comp[2].plane, s->main_desc->comp[2].offset, s->main_desc->comp[2].step);
643  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha,
644  s->main_desc->comp[0].plane, s->main_desc->comp[0].offset, s->main_desc->comp[0].step);
645 
646  if (main_has_alpha)
647  alpha_composite(src, dst, src_w, src_h, dst_w, dst_h, x, y);
648 }
649 
650 static void blend_image_yuv420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
651 {
652  blend_image_yuv(ctx, dst, src, 1, 1, 0, x, y);
653 }
654 
655 static void blend_image_yuva420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
656 {
657  blend_image_yuv(ctx, dst, src, 1, 1, 1, x, y);
658 }
659 
660 static void blend_image_yuv422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
661 {
662  blend_image_yuv(ctx, dst, src, 1, 0, 0, x, y);
663 }
664 
665 static void blend_image_yuva422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
666 {
667  blend_image_yuv(ctx, dst, src, 1, 0, 1, x, y);
668 }
669 
670 static void blend_image_yuv444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
671 {
672  blend_image_yuv(ctx, dst, src, 0, 0, 0, x, y);
673 }
674 
675 static void blend_image_yuva444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
676 {
677  blend_image_yuv(ctx, dst, src, 0, 0, 1, x, y);
678 }
679 
680 static void blend_image_gbrp(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
681 {
682  blend_image_planar_rgb(ctx, dst, src, 0, 0, 0, x, y);
683 }
684 
685 static void blend_image_gbrap(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
686 {
687  blend_image_planar_rgb(ctx, dst, src, 0, 0, 1, x, y);
688 }
689 
690 static void blend_image_rgb(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
691 {
692  blend_image_packed_rgb(ctx, dst, src, 0, x, y);
693 }
694 
695 static void blend_image_rgba(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
696 {
697  blend_image_packed_rgb(ctx, dst, src, 1, x, y);
698 }
699 
700 static int config_input_main(AVFilterLink *inlink)
701 {
702  OverlayContext *s = inlink->dst->priv;
703  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
704 
706 
707  s->hsub = pix_desc->log2_chroma_w;
708  s->vsub = pix_desc->log2_chroma_h;
709 
710  s->main_desc = pix_desc;
711 
712  s->main_is_packed_rgb =
713  ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
715  switch (s->format) {
718  break;
721  break;
724  break;
725  case OVERLAY_FORMAT_RGB:
727  break;
728  case OVERLAY_FORMAT_GBRP:
730  break;
731  case OVERLAY_FORMAT_AUTO:
732  switch (inlink->format) {
733  case AV_PIX_FMT_YUVA420P:
735  break;
736  case AV_PIX_FMT_YUVA422P:
738  break;
739  case AV_PIX_FMT_YUVA444P:
741  break;
742  case AV_PIX_FMT_ARGB:
743  case AV_PIX_FMT_RGBA:
744  case AV_PIX_FMT_BGRA:
745  case AV_PIX_FMT_ABGR:
747  break;
748  case AV_PIX_FMT_GBRAP:
750  break;
751  default:
752  av_assert0(0);
753  break;
754  }
755  break;
756  }
757  return 0;
758 }
759 
760 static int do_blend(FFFrameSync *fs)
761 {
762  AVFilterContext *ctx = fs->parent;
763  AVFrame *mainpic, *second;
764  OverlayContext *s = ctx->priv;
765  AVFilterLink *inlink = ctx->inputs[0];
766  int ret;
767 
768  ret = ff_framesync_dualinput_get_writable(fs, &mainpic, &second);
769  if (ret < 0)
770  return ret;
771  if (!second)
772  return ff_filter_frame(ctx->outputs[0], mainpic);
773 
774  if (s->eval_mode == EVAL_MODE_FRAME) {
775  int64_t pos = mainpic->pkt_pos;
776 
777  s->var_values[VAR_N] = inlink->frame_count_out;
778  s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
779  NAN : mainpic->pts * av_q2d(inlink->time_base);
780  s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
781 
782  s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = second->width;
783  s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = second->height;
784  s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = mainpic->width;
785  s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = mainpic->height;
786 
787  eval_expr(ctx);
788  av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
790  s->var_values[VAR_X], s->x,
791  s->var_values[VAR_Y], s->y);
792  }
793 
794  if (s->x < mainpic->width && s->x + second->width >= 0 ||
795  s->y < mainpic->height && s->y + second->height >= 0)
796  s->blend_image(ctx, mainpic, second, s->x, s->y);
797  return ff_filter_frame(ctx->outputs[0], mainpic);
798 }
799 
801 {
802  OverlayContext *s = ctx->priv;
803 
804  s->fs.on_event = do_blend;
805  return 0;
806 }
807 
809 {
810  OverlayContext *s = ctx->priv;
811  return ff_framesync_activate(&s->fs);
812 }
813 
814 #define OFFSET(x) offsetof(OverlayContext, x)
815 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
816 
817 static const AVOption overlay_options[] = {
818  { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
819  { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
820  { "eof_action", "Action to take when encountering EOF from secondary input ",
821  OFFSET(fs.opt_eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
822  EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
823  { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
824  { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
825  { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
826  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
827  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
828  { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
829  { "shortest", "force termination when the shortest input terminates", OFFSET(fs.opt_shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
830  { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
831  { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
832  { "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" },
833  { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
834  { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
835  { "gbrp", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_GBRP}, .flags = FLAGS, .unit = "format" },
836  { "auto", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_AUTO}, .flags = FLAGS, .unit = "format" },
837  { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(fs.opt_repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
838  { NULL }
839 };
840 
842 
844  {
845  .name = "main",
846  .type = AVMEDIA_TYPE_VIDEO,
847  .config_props = config_input_main,
848  },
849  {
850  .name = "overlay",
851  .type = AVMEDIA_TYPE_VIDEO,
852  .config_props = config_input_overlay,
853  },
854  { NULL }
855 };
856 
858  {
859  .name = "default",
860  .type = AVMEDIA_TYPE_VIDEO,
861  .config_props = config_output,
862  },
863  { NULL }
864 };
865 
867  .name = "overlay",
868  .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
869  .preinit = overlay_framesync_preinit,
870  .init = init,
871  .uninit = uninit,
872  .priv_size = sizeof(OverlayContext),
873  .priv_class = &overlay_class,
875  .activate = activate,
877  .inputs = avfilter_vf_overlay_inputs,
878  .outputs = avfilter_vf_overlay_outputs,
880 };
static int activate(AVFilterContext *ctx)
Definition: vf_overlay.c:808
int plane
Which of the 4 planes contains the component.
Definition: pixdesc.h:35
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
static float alpha(float a)
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2359
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
AVOption.
Definition: opt.h:246
int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:473
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
misc image utilities
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:64
int(* on_event)(struct FFFrameSync *fs)
Callback called when a frame event is ready.
Definition: framesync.h:172
const AVPixFmtDescriptor * main_desc
format descriptor for main input
Definition: vf_overlay.c:119
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:164
static const AVFilterPad avfilter_vf_overlay_inputs[]
Definition: vf_overlay.c:843
static av_always_inline void blend_image_yuv(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int hsub, int vsub, int main_has_alpha, int x, int y)
Definition: vf_overlay.c:604
int ff_framesync_configure(FFFrameSync *fs)
Configure a frame sync structure.
Definition: framesync.c:117
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:679
#define src
Definition: vp8dsp.c:254
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
void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], const AVPixFmtDescriptor *pixdesc)
Compute the max pixel step for each plane of an image with a format described by pixdesc.
Definition: imgutils.c:35
const char * name
Pad name.
Definition: internal.h:60
AVFilterContext * parent
Parent filter context.
Definition: framesync.h:152
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
static void blend_image_yuv422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:660
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1113
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:97
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:117
uint8_t
#define av_cold
Definition: attributes.h:82
AVOptions.
static void blend_image_yuv444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:670
timestamp utils, mostly useful for debugging/logging purposes
static const char *const var_names[]
Definition: vf_overlay.c:43
int ff_framesync_init_dualinput(FFFrameSync *fs, AVFilterContext *parent)
Initialize a frame sync structure for dualinput.
Definition: framesync.c:361
#define G
Definition: vf_overlay.c:77
double var_values[VAR_VARS_NB]
Definition: vf_overlay.c:121
int ff_framesync_dualinput_get_writable(FFFrameSync *fs, AVFrame **f0, AVFrame **f1)
Same as ff_framesync_dualinput_get(), but make sure that f0 is writable.
Definition: framesync.c:399
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:294
Definition: eval.c:157
#define R
Definition: vf_overlay.c:76
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:90
#define FAST_DIV255(x)
Definition: vf_overlay.c:392
uint8_t overlay_rgba_map[4]
Definition: vf_overlay.c:109
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
static int flags
Definition: log.c:57
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:75
AVExpr * y_pexpr
Definition: vf_overlay.c:124
static void blend_image_gbrap(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:685
#define sp
Definition: regdef.h:63
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
static void blend_image_yuva444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:675
#define OVERLAY
Definition: vf_overlay.c:74
int ff_fmt_is_in(int fmt, const int *fmts)
Tell if an integer is contained in the provided -1-terminated list of integers.
Definition: formats.c:254
static void blend_image_packed_rgb(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int main_has_alpha, int x, int y)
Blend image in src to destination buffer dst at position (x, y).
Definition: vf_overlay.c:404
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:54
int eval_mode
EvalMode.
Definition: vf_overlay.c:112
int format
OverlayFormat.
Definition: vf_overlay.c:111
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:172
int width
Definition: frame.h:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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 UNPREMULTIPLY_ALPHA(x, y)
Definition: vf_overlay.c:398
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
void ff_framesync_uninit(FFFrameSync *fs)
Free all memory currently allocated.
Definition: framesync.c:293
#define S(s, c, i)
Frame sync structure.
Definition: framesync.h:146
static void alpha_composite(const AVFrame *src, const AVFrame *dst, int src_w, int src_h, int dst_w, int dst_h, int x, int y)
Definition: vf_overlay.c:562
#define AVERROR(e)
Definition: error.h:43
uint8_t main_has_alpha
Definition: vf_overlay.c:107
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:91
void * priv
private data for use by the filter
Definition: avfilter.h:353
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (firs...
Definition: pixfmt.h:85
static int config_input_overlay(AVFilterLink *inlink)
Definition: vf_overlay.c:327
int ff_framesync_activate(FFFrameSync *fs)
Examine the frames in the filter's input and try to produce output.
Definition: framesync.c:344
#define FFMAX(a, b)
Definition: common.h:94
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:88
#define fail()
Definition: checkasm.h:111
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:89
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:66
var_name
Definition: aeval.c:46
as above, but U and V bytes are swapped
Definition: pixfmt.h:86
static const AVFilterPad avfilter_vf_overlay_outputs[]
Definition: vf_overlay.c:857
#define NAN
Definition: mathematics.h:64
#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
uint8_t main_rgba_map[4]
Definition: vf_overlay.c:106
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add *ref as a new reference to formats.
Definition: formats.c:440
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
OverlayFormat
Definition: vf_overlay.c:91
AVFormatContext * ctx
Definition: movenc.c:48
#define B
Definition: vf_overlay.c:78
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
static av_cold int init(AVFilterContext *ctx)
Definition: vf_overlay.c:800
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static void blend_image_yuva422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:665
int main_pix_step[4]
steps per pixel for each plane of the main output
Definition: vf_overlay.c:116
EvalMode
Definition: af_volume.h:39
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:35
static const AVOption overlay_options[]
Definition: vf_overlay.c:817
misc drawing utilities
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:334
void(* blend_image)(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:126
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_overlay.c:129
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:173
static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
Definition: vf_overlay.c:156
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
AVExpr * x_pexpr
Definition: vf_overlay.c:124
#define OFFSET(x)
Definition: vf_overlay.c:814
int y
position of overlaid picture
Definition: vf_overlay.c:103
static const char * format
Definition: movenc.c:47
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
static void blend_image_rgb(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:690
uint8_t overlay_has_alpha
Definition: vf_overlay.c:110
#define FLAGS
Definition: vf_overlay.c:815
option
Definition: libkvazaar.c:282
#define isnan(x)
Definition: libm.h:340
uint8_t overlay_is_packed_rgb
Definition: vf_overlay.c:108
static av_always_inline void blend_image_planar_rgb(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int hsub, int vsub, int main_has_alpha, int x, int y)
Definition: vf_overlay.c:627
#define A
Definition: vf_overlay.c:79
const char * name
Filter name.
Definition: avfilter.h:148
static int query_formats(AVFilterContext *ctx)
Definition: vf_overlay.c:208
#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL
Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will have its filter_frame() c...
Definition: avfilter.h:133
int overlay_pix_step[4]
steps per pixel for each plane of the overlay
Definition: vf_overlay.c:117
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static void blend_image_yuva420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:655
int offset
Number of elements before the component of the first pixel.
Definition: pixdesc.h:47
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
static void blend_image_rgba(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:695
static int normalize_xy(double d, int chroma_sub)
Definition: vf_overlay.c:138
static int config_input_main(AVFilterLink *inlink)
Definition: vf_overlay.c:700
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
common internal and external API header
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:211
static void blend_image_yuv420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:650
int vsub
chroma subsampling values
Definition: vf_overlay.c:118
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:76
AVFilter ff_vf_overlay
Definition: vf_overlay.c:866
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:734
static int config_output(AVFilterLink *outlink)
Definition: vf_overlay.c:374
A list of supported formats for one end of a filter link.
Definition: formats.h:64
uint8_t main_is_packed_rgb
Definition: vf_overlay.c:105
An instance of a filter.
Definition: avfilter.h:338
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: vf_overlay.c:177
FFFrameSync fs
Definition: vf_overlay.c:114
int height
Definition: frame.h:259
FRAMESYNC_DEFINE_CLASS(overlay, OverlayContext, fs)
#define MAIN
Definition: vf_overlay.c:73
#define av_freep(p)
#define av_always_inline
Definition: attributes.h:39
static void eval_expr(AVFilterContext *ctx)
Definition: vf_overlay.c:145
static int do_blend(FFFrameSync *fs)
Definition: vf_overlay.c:760
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2275
internal API functions
static av_always_inline void blend_plane(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int src_w, int src_h, int dst_w, int dst_h, int i, int hsub, int vsub, int x, int y, int main_has_alpha, int dst_plane, int dst_offset, int dst_step)
Definition: vf_overlay.c:481
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
static void blend_image_gbrp(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:680
for(j=16;j >0;--j)
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
static enum AVPixelFormat alpha_pix_fmts[]
Definition: vf_overlay.c:202
int step
Number of elements between 2 horizontally consecutive pixels.
Definition: pixdesc.h:41
simple arithmetic expression evaluator
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58
int * formats
list of media formats
Definition: formats.h:66