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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 "dualinput.h"
40 #include "drawutils.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 enum EOFAction {
77 };
78 
79 static const char * const eof_action_str[] = {
80  "repeat", "endall", "pass"
81 };
82 
83 #define MAIN 0
84 #define OVERLAY 1
85 
86 #define R 0
87 #define G 1
88 #define B 2
89 #define A 3
90 
91 #define Y 0
92 #define U 1
93 #define V 2
94 
95 enum EvalMode {
99 };
100 
109 };
110 
111 typedef struct OverlayContext {
112  const AVClass *class;
113  int x, y; ///< position of overlaid picture
114 
121  int format; ///< OverlayFormat
122  int eval_mode; ///< EvalMode
123 
125 
126  int main_pix_step[4]; ///< steps per pixel for each plane of the main output
127  int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
128  int hsub, vsub; ///< chroma subsampling values
129  const AVPixFmtDescriptor *main_desc; ///< format descriptor for main input
130 
132  char *x_expr, *y_expr;
133 
134  int eof_action; ///< action to take on EOF from source
135 
137 
138  void (*blend_image)(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y);
140 
142 {
143  OverlayContext *s = ctx->priv;
144 
146  av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
147  av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
148 }
149 
150 static inline int normalize_xy(double d, int chroma_sub)
151 {
152  if (isnan(d))
153  return INT_MAX;
154  return (int)d & ~((1 << chroma_sub) - 1);
155 }
156 
158 {
159  OverlayContext *s = ctx->priv;
160 
164  s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
165  s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
166 }
167 
168 static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
169 {
170  int ret;
171  AVExpr *old = NULL;
172 
173  if (*pexpr)
174  old = *pexpr;
175  ret = av_expr_parse(pexpr, expr, var_names,
176  NULL, NULL, NULL, NULL, 0, log_ctx);
177  if (ret < 0) {
178  av_log(log_ctx, AV_LOG_ERROR,
179  "Error when evaluating the expression '%s' for %s\n",
180  expr, option);
181  *pexpr = old;
182  return ret;
183  }
184 
185  av_expr_free(old);
186  return 0;
187 }
188 
189 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
190  char *res, int res_len, int flags)
191 {
192  OverlayContext *s = ctx->priv;
193  int ret;
194 
195  if (!strcmp(cmd, "x"))
196  ret = set_expr(&s->x_pexpr, args, cmd, ctx);
197  else if (!strcmp(cmd, "y"))
198  ret = set_expr(&s->y_pexpr, args, cmd, ctx);
199  else
200  ret = AVERROR(ENOSYS);
201 
202  if (ret < 0)
203  return ret;
204 
205  if (s->eval_mode == EVAL_MODE_INIT) {
206  eval_expr(ctx);
207  av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
208  s->var_values[VAR_X], s->x,
209  s->var_values[VAR_Y], s->y);
210  }
211  return ret;
212 }
213 
214 static const enum AVPixelFormat alpha_pix_fmts[] = {
218 };
219 
221 {
222  OverlayContext *s = ctx->priv;
223 
224  /* overlay formats contains alpha, for avoiding conversion with alpha information loss */
225  static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
229  };
230  static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
232  };
233 
234  static const enum AVPixelFormat main_pix_fmts_yuv422[] = {
236  };
237  static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = {
239  };
240 
241  static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
243  };
244  static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
246  };
247 
248  static const enum AVPixelFormat main_pix_fmts_gbrp[] = {
250  };
251  static const enum AVPixelFormat overlay_pix_fmts_gbrp[] = {
253  };
254 
255  static const enum AVPixelFormat main_pix_fmts_rgb[] = {
260  };
261  static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
265  };
266 
267  AVFilterFormats *main_formats = NULL;
268  AVFilterFormats *overlay_formats = NULL;
269  int ret;
270 
271  switch (s->format) {
273  if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv420)) ||
274  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420))) {
275  ret = AVERROR(ENOMEM);
276  goto fail;
277  }
278  break;
280  if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv422)) ||
281  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422))) {
282  ret = AVERROR(ENOMEM);
283  goto fail;
284  }
285  break;
287  if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv444)) ||
288  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444))) {
289  ret = AVERROR(ENOMEM);
290  goto fail;
291  }
292  break;
293  case OVERLAY_FORMAT_RGB:
294  if (!(main_formats = ff_make_format_list(main_pix_fmts_rgb)) ||
295  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb))) {
296  ret = AVERROR(ENOMEM);
297  goto fail;
298  }
299  break;
300  case OVERLAY_FORMAT_GBRP:
301  if (!(main_formats = ff_make_format_list(main_pix_fmts_gbrp)) ||
302  !(overlay_formats = ff_make_format_list(overlay_pix_fmts_gbrp))) {
303  ret = AVERROR(ENOMEM);
304  goto fail;
305  }
306  break;
307  case OVERLAY_FORMAT_AUTO:
308  if (!(main_formats = ff_make_format_list(alpha_pix_fmts))) {
309  ret = AVERROR(ENOMEM);
310  goto fail;
311  }
312  break;
313  default:
314  av_assert0(0);
315  }
316 
317  if (s->format == OVERLAY_FORMAT_AUTO) {
318  ret = ff_set_common_formats(ctx, main_formats);
319  if (ret < 0)
320  goto fail;
321  } else {
322  if ((ret = ff_formats_ref(main_formats , &ctx->inputs[MAIN]->out_formats )) < 0 ||
323  (ret = ff_formats_ref(overlay_formats, &ctx->inputs[OVERLAY]->out_formats)) < 0 ||
324  (ret = ff_formats_ref(main_formats , &ctx->outputs[MAIN]->in_formats )) < 0)
325  goto fail;
326  }
327 
328  return 0;
329 fail:
330  if (main_formats)
331  av_freep(&main_formats->formats);
332  av_freep(&main_formats);
333  if (overlay_formats)
334  av_freep(&overlay_formats->formats);
335  av_freep(&overlay_formats);
336  return ret;
337 }
338 
340 {
341  AVFilterContext *ctx = inlink->dst;
342  OverlayContext *s = inlink->dst->priv;
343  int ret;
344  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
345 
347 
348  /* Finish the configuration by evaluating the expressions
349  now when both inputs are configured. */
350  s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
351  s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
354  s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
355  s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
356  s->var_values[VAR_X] = NAN;
357  s->var_values[VAR_Y] = NAN;
358  s->var_values[VAR_N] = 0;
359  s->var_values[VAR_T] = NAN;
360  s->var_values[VAR_POS] = NAN;
361 
362  if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
363  (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
364  return ret;
365 
367  ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
369 
370  if (s->eval_mode == EVAL_MODE_INIT) {
371  eval_expr(ctx);
372  av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
373  s->var_values[VAR_X], s->x,
374  s->var_values[VAR_Y], s->y);
375  }
376 
377  av_log(ctx, AV_LOG_VERBOSE,
378  "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s eof_action:%s\n",
379  ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
381  ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
384  return 0;
385 }
386 
387 static int config_output(AVFilterLink *outlink)
388 {
389  AVFilterContext *ctx = outlink->src;
390  OverlayContext *s = ctx->priv;
391  int ret;
392 
393  if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
394  return ret;
395 
396  outlink->w = ctx->inputs[MAIN]->w;
397  outlink->h = ctx->inputs[MAIN]->h;
398  outlink->time_base = ctx->inputs[MAIN]->time_base;
399 
400  return 0;
401 }
402 
403 // divide by 255 and round to nearest
404 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
405 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
406 
407 // calculate the unpremultiplied alpha, applying the general equation:
408 // alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
409 // (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
410 // ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
411 #define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
412 
413 /**
414  * Blend image in src to destination buffer dst at position (x, y).
415  */
416 
418  AVFrame *dst, const AVFrame *src,
419  int main_has_alpha, int x, int y)
420 {
421  OverlayContext *s = ctx->priv;
422  int i, imax, j, jmax;
423  const int src_w = src->width;
424  const int src_h = src->height;
425  const int dst_w = dst->width;
426  const int dst_h = dst->height;
427  uint8_t alpha; ///< the amount of overlay to blend on to main
428  const int dr = s->main_rgba_map[R];
429  const int dg = s->main_rgba_map[G];
430  const int db = s->main_rgba_map[B];
431  const int da = s->main_rgba_map[A];
432  const int dstep = s->main_pix_step[0];
433  const int sr = s->overlay_rgba_map[R];
434  const int sg = s->overlay_rgba_map[G];
435  const int sb = s->overlay_rgba_map[B];
436  const int sa = s->overlay_rgba_map[A];
437  const int sstep = s->overlay_pix_step[0];
438  uint8_t *S, *sp, *d, *dp;
439 
440  i = FFMAX(-y, 0);
441  sp = src->data[0] + i * src->linesize[0];
442  dp = dst->data[0] + (y+i) * dst->linesize[0];
443 
444  for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
445  j = FFMAX(-x, 0);
446  S = sp + j * sstep;
447  d = dp + (x+j) * dstep;
448 
449  for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
450  alpha = S[sa];
451 
452  // if the main channel has an alpha channel, alpha has to be calculated
453  // to create an un-premultiplied (straight) alpha value
454  if (main_has_alpha && alpha != 0 && alpha != 255) {
455  uint8_t alpha_d = d[da];
456  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
457  }
458 
459  switch (alpha) {
460  case 0:
461  break;
462  case 255:
463  d[dr] = S[sr];
464  d[dg] = S[sg];
465  d[db] = S[sb];
466  break;
467  default:
468  // main_value = main_value * (1 - alpha) + overlay_value * alpha
469  // since alpha is in the range 0-255, the result must divided by 255
470  d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + S[sr] * alpha);
471  d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + S[sg] * alpha);
472  d[db] = FAST_DIV255(d[db] * (255 - alpha) + S[sb] * alpha);
473  }
474  if (main_has_alpha) {
475  switch (alpha) {
476  case 0:
477  break;
478  case 255:
479  d[da] = S[sa];
480  break;
481  default:
482  // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
483  d[da] += FAST_DIV255((255 - d[da]) * S[sa]);
484  }
485  }
486  d += dstep;
487  S += sstep;
488  }
489  dp += dst->linesize[0];
490  sp += src->linesize[0];
491  }
492 }
493 
495  AVFrame *dst, const AVFrame *src,
496  int src_w, int src_h,
497  int dst_w, int dst_h,
498  int i, int hsub, int vsub,
499  int x, int y,
500  int main_has_alpha,
501  int dst_plane,
502  int dst_offset,
503  int dst_step)
504 {
505  int src_wp = AV_CEIL_RSHIFT(src_w, hsub);
506  int src_hp = AV_CEIL_RSHIFT(src_h, vsub);
507  int dst_wp = AV_CEIL_RSHIFT(dst_w, hsub);
508  int dst_hp = AV_CEIL_RSHIFT(dst_h, vsub);
509  int yp = y>>vsub;
510  int xp = x>>hsub;
511  uint8_t *s, *sp, *d, *dp, *a, *ap;
512  int jmax, j, k, kmax;
513 
514  j = FFMAX(-yp, 0);
515  sp = src->data[i] + j * src->linesize[i];
516  dp = dst->data[dst_plane]
517  + (yp+j) * dst->linesize[dst_plane]
518  + dst_offset;
519  ap = src->data[3] + (j<<vsub) * src->linesize[3];
520 
521  for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
522  k = FFMAX(-xp, 0);
523  d = dp + (xp+k) * dst_step;
524  s = sp + k;
525  a = ap + (k<<hsub);
526 
527  for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
528  int alpha_v, alpha_h, alpha;
529 
530  // average alpha for color components, improve quality
531  if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
532  alpha = (a[0] + a[src->linesize[3]] +
533  a[1] + a[src->linesize[3]+1]) >> 2;
534  } else if (hsub || vsub) {
535  alpha_h = hsub && k+1 < src_wp ?
536  (a[0] + a[1]) >> 1 : a[0];
537  alpha_v = vsub && j+1 < src_hp ?
538  (a[0] + a[src->linesize[3]]) >> 1 : a[0];
539  alpha = (alpha_v + alpha_h) >> 1;
540  } else
541  alpha = a[0];
542  // if the main channel has an alpha channel, alpha has to be calculated
543  // to create an un-premultiplied (straight) alpha value
544  if (main_has_alpha && alpha != 0 && alpha != 255) {
545  // average alpha for color components, improve quality
546  uint8_t alpha_d;
547  if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
548  alpha_d = (d[0] + d[src->linesize[3]] +
549  d[1] + d[src->linesize[3]+1]) >> 2;
550  } else if (hsub || vsub) {
551  alpha_h = hsub && k+1 < src_wp ?
552  (d[0] + d[1]) >> 1 : d[0];
553  alpha_v = vsub && j+1 < src_hp ?
554  (d[0] + d[src->linesize[3]]) >> 1 : d[0];
555  alpha_d = (alpha_v + alpha_h) >> 1;
556  } else
557  alpha_d = d[0];
558  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
559  }
560  *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
561  s++;
562  d += dst_step;
563  a += 1 << hsub;
564  }
565  dp += dst->linesize[dst_plane];
566  sp += src->linesize[i];
567  ap += (1 << vsub) * src->linesize[3];
568  }
569 }
570 
571 static inline void alpha_composite(const AVFrame *src, const AVFrame *dst,
572  int src_w, int src_h,
573  int dst_w, int dst_h,
574  int x, int y)
575 {
576  uint8_t alpha; ///< the amount of overlay to blend on to main
577  uint8_t *s, *sa, *d, *da;
578  int i, imax, j, jmax;
579 
580  i = FFMAX(-y, 0);
581  sa = src->data[3] + i * src->linesize[3];
582  da = dst->data[3] + (y+i) * dst->linesize[3];
583 
584  for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
585  j = FFMAX(-x, 0);
586  s = sa + j;
587  d = da + x+j;
588 
589  for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
590  alpha = *s;
591  if (alpha != 0 && alpha != 255) {
592  uint8_t alpha_d = *d;
593  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
594  }
595  switch (alpha) {
596  case 0:
597  break;
598  case 255:
599  *d = *s;
600  break;
601  default:
602  // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
603  *d += FAST_DIV255((255 - *d) * *s);
604  }
605  d += 1;
606  s += 1;
607  }
608  da += dst->linesize[3];
609  sa += src->linesize[3];
610  }
611 }
612 
614  AVFrame *dst, const AVFrame *src,
615  int hsub, int vsub,
616  int main_has_alpha,
617  int x, int y)
618 {
619  OverlayContext *s = ctx->priv;
620  const int src_w = src->width;
621  const int src_h = src->height;
622  const int dst_w = dst->width;
623  const int dst_h = dst->height;
624 
625  if (main_has_alpha)
626  alpha_composite(src, dst, src_w, src_h, dst_w, dst_h, x, y);
627 
628  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha,
629  s->main_desc->comp[0].plane, s->main_desc->comp[0].offset, s->main_desc->comp[0].step);
630  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha,
631  s->main_desc->comp[1].plane, s->main_desc->comp[1].offset, s->main_desc->comp[1].step);
632  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha,
633  s->main_desc->comp[2].plane, s->main_desc->comp[2].offset, s->main_desc->comp[2].step);
634 }
635 
637  AVFrame *dst, const AVFrame *src,
638  int hsub, int vsub,
639  int main_has_alpha,
640  int x, int y)
641 {
642  OverlayContext *s = ctx->priv;
643  const int src_w = src->width;
644  const int src_h = src->height;
645  const int dst_w = dst->width;
646  const int dst_h = dst->height;
647 
648  if (main_has_alpha)
649  alpha_composite(src, dst, src_w, src_h, dst_w, dst_h, x, y);
650 
651  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha,
652  s->main_desc->comp[1].plane, s->main_desc->comp[1].offset, s->main_desc->comp[1].step);
653  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha,
654  s->main_desc->comp[2].plane, s->main_desc->comp[2].offset, s->main_desc->comp[2].step);
655  blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha,
656  s->main_desc->comp[0].plane, s->main_desc->comp[0].offset, s->main_desc->comp[0].step);
657 }
658 
659 static void blend_image_yuv420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
660 {
661  blend_image_yuv(ctx, dst, src, 1, 1, 0, x, y);
662 }
663 
664 static void blend_image_yuva420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
665 {
666  blend_image_yuv(ctx, dst, src, 1, 1, 1, x, y);
667 }
668 
669 static void blend_image_yuv422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
670 {
671  blend_image_yuv(ctx, dst, src, 1, 0, 0, x, y);
672 }
673 
674 static void blend_image_yuva422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
675 {
676  blend_image_yuv(ctx, dst, src, 1, 0, 1, x, y);
677 }
678 
679 static void blend_image_yuv444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
680 {
681  blend_image_yuv(ctx, dst, src, 0, 0, 0, x, y);
682 }
683 
684 static void blend_image_yuva444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
685 {
686  blend_image_yuv(ctx, dst, src, 0, 0, 1, x, y);
687 }
688 
689 static void blend_image_gbrp(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
690 {
691  blend_image_planar_rgb(ctx, dst, src, 0, 0, 0, x, y);
692 }
693 
694 static void blend_image_gbrap(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
695 {
696  blend_image_planar_rgb(ctx, dst, src, 0, 0, 1, x, y);
697 }
698 
699 static void blend_image_rgb(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
700 {
701  blend_image_packed_rgb(ctx, dst, src, 0, x, y);
702 }
703 
704 static void blend_image_rgba(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
705 {
706  blend_image_packed_rgb(ctx, dst, src, 1, x, y);
707 }
708 
709 static int config_input_main(AVFilterLink *inlink)
710 {
711  OverlayContext *s = inlink->dst->priv;
712  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
713 
715 
716  s->hsub = pix_desc->log2_chroma_w;
717  s->vsub = pix_desc->log2_chroma_h;
718 
719  s->main_desc = pix_desc;
720 
721  s->main_is_packed_rgb =
722  ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
724  switch (s->format) {
727  break;
730  break;
733  break;
734  case OVERLAY_FORMAT_RGB:
736  break;
737  case OVERLAY_FORMAT_GBRP:
739  break;
740  case OVERLAY_FORMAT_AUTO:
741  switch (inlink->format) {
742  case AV_PIX_FMT_YUVA420P:
744  break;
745  case AV_PIX_FMT_YUVA422P:
747  break;
748  case AV_PIX_FMT_YUVA444P:
750  break;
751  case AV_PIX_FMT_ARGB:
752  case AV_PIX_FMT_RGBA:
753  case AV_PIX_FMT_BGRA:
754  case AV_PIX_FMT_ABGR:
756  break;
757  case AV_PIX_FMT_GBRAP:
759  break;
760  default:
761  av_assert0(0);
762  break;
763  }
764  break;
765  }
766  return 0;
767 }
768 
770  const AVFrame *second)
771 {
772  OverlayContext *s = ctx->priv;
773  AVFilterLink *inlink = ctx->inputs[0];
774 
775  if (s->eval_mode == EVAL_MODE_FRAME) {
776  int64_t pos = mainpic->pkt_pos;
777 
778  s->var_values[VAR_N] = inlink->frame_count_out;
779  s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
780  NAN : mainpic->pts * av_q2d(inlink->time_base);
781  s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
782 
783  s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = second->width;
784  s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = second->height;
785  s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = mainpic->width;
786  s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = mainpic->height;
787 
788  eval_expr(ctx);
789  av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
791  s->var_values[VAR_X], s->x,
792  s->var_values[VAR_Y], s->y);
793  }
794 
795  if (s->x < mainpic->width && s->x + second->width >= 0 ||
796  s->y < mainpic->height && s->y + second->height >= 0)
797  s->blend_image(ctx, mainpic, second, s->x, s->y);
798  return mainpic;
799 }
800 
801 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
802 {
803  OverlayContext *s = inlink->dst->priv;
804  av_log(inlink->dst, AV_LOG_DEBUG, "Incoming frame (time:%s) from link #%d\n", av_ts2timestr(inpicref->pts, &inlink->time_base), FF_INLINK_IDX(inlink));
805  return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
806 }
807 
808 static int request_frame(AVFilterLink *outlink)
809 {
810  OverlayContext *s = outlink->src->priv;
811  return ff_dualinput_request_frame(&s->dinput, outlink);
812 }
813 
815 {
816  OverlayContext *s = ctx->priv;
817 
818  if (!s->dinput.repeatlast || s->eof_action == EOF_ACTION_PASS) {
819  s->dinput.repeatlast = 0;
821  }
822  if (s->dinput.shortest || s->eof_action == EOF_ACTION_ENDALL) {
823  s->dinput.shortest = 1;
825  }
826 
827  s->dinput.process = do_blend;
828  return 0;
829 }
830 
831 #define OFFSET(x) offsetof(OverlayContext, x)
832 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
833 
834 static const AVOption overlay_options[] = {
835  { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
836  { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
837  { "eof_action", "Action to take when encountering EOF from secondary input ",
838  OFFSET(eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
839  EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
840  { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
841  { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
842  { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
843  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
844  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
845  { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
846  { "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
847  { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
848  { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
849  { "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" },
850  { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
851  { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
852  { "gbrp", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_GBRP}, .flags = FLAGS, .unit = "format" },
853  { "auto", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_AUTO}, .flags = FLAGS, .unit = "format" },
854  { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
855  { NULL }
856 };
857 
858 AVFILTER_DEFINE_CLASS(overlay);
859 
861  {
862  .name = "main",
863  .type = AVMEDIA_TYPE_VIDEO,
864  .config_props = config_input_main,
865  .filter_frame = filter_frame,
866  .needs_writable = 1,
867  },
868  {
869  .name = "overlay",
870  .type = AVMEDIA_TYPE_VIDEO,
871  .config_props = config_input_overlay,
872  .filter_frame = filter_frame,
873  },
874  { NULL }
875 };
876 
878  {
879  .name = "default",
880  .type = AVMEDIA_TYPE_VIDEO,
881  .config_props = config_output,
882  .request_frame = request_frame,
883  },
884  { NULL }
885 };
886 
888  .name = "overlay",
889  .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
890  .init = init,
891  .uninit = uninit,
892  .priv_size = sizeof(OverlayContext),
893  .priv_class = &overlay_class,
896  .inputs = avfilter_vf_overlay_inputs,
897  .outputs = avfilter_vf_overlay_outputs,
899 };
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:2337
This structure describes decoded (raw) audio or video data.
Definition: frame.h:194
AVOption.
Definition: opt.h:246
static int request_frame(AVFilterLink *outlink)
Definition: vf_overlay.c:808
int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:466
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
const AVPixFmtDescriptor * main_desc
format descriptor for main input
Definition: vf_overlay.c:129
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:180
static const AVFilterPad avfilter_vf_overlay_inputs[]
Definition: vf_overlay.c:860
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:613
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:664
#define src
Definition: vp8dsp.c:254
static const char *const eof_action_str[]
Definition: vf_overlay.c:79
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:59
int ff_dualinput_filter_frame(FFDualInputContext *s, AVFilterLink *inlink, AVFrame *in)
Definition: dualinput.c:76
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:331
static void blend_image_yuv422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:669
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AVFILTER_DEFINE_CLASS(overlay)
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:102
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:117
uint8_t
#define av_cold
Definition: attributes.h:82
FFDualInputContext dinput
Definition: vf_overlay.c:124
static AVFrame * do_blend(AVFilterContext *ctx, AVFrame *mainpic, const AVFrame *second)
Definition: vf_overlay.c:769
AVOptions.
static void blend_image_yuv444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:679
timestamp utils, mostly useful for debugging/logging purposes
static const char *const var_names[]
Definition: vf_overlay.c:43
#define G
Definition: vf_overlay.c:87
int shortest
terminate stream when the second input terminates
Definition: dualinput.h:36
double var_values[VAR_VARS_NB]
Definition: vf_overlay.c:131
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:287
Definition: eval.c:150
#define R
Definition: vf_overlay.c:86
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:95
#define FAST_DIV255(x)
Definition: vf_overlay.c:405
uint8_t overlay_rgba_map[4]
Definition: vf_overlay.c:119
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:136
static void blend_image_gbrap(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:694
#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:684
void ff_dualinput_uninit(FFDualInputContext *s)
Definition: dualinput.c:87
#define OVERLAY
Definition: vf_overlay.c:84
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:417
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:53
int eval_mode
EvalMode.
Definition: vf_overlay.c:122
int format
OverlayFormat.
Definition: vf_overlay.c:121
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:188
int width
Definition: frame.h:252
#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:411
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
#define S(s, c, i)
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:571
#define AVERROR(e)
Definition: error.h:43
uint8_t main_has_alpha
Definition: vf_overlay.c:117
#define av_ts2timestr(ts, tb)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:76
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:96
void * priv
private data for use by the filter
Definition: avfilter.h:338
#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:90
static int config_input_overlay(AVFilterLink *inlink)
Definition: vf_overlay.c:339
#define FFMAX(a, b)
Definition: common.h:94
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:93
#define fail()
Definition: checkasm.h:98
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:94
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:91
static const AVFilterPad avfilter_vf_overlay_outputs[]
Definition: vf_overlay.c:877
#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:116
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:101
AVFormatContext * ctx
Definition: movenc.c:48
#define B
Definition: vf_overlay.c:88
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
AVFrame *(* process)(AVFilterContext *ctx, AVFrame *main, const AVFrame *second)
Definition: dualinput.h:35
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:389
static av_cold int init(AVFilterContext *ctx)
Definition: vf_overlay.c:814
static void blend_image_yuva422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:674
int main_pix_step[4]
steps per pixel for each plane of the main output
Definition: vf_overlay.c:126
EvalMode
Definition: af_volume.h:39
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:834
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:379
misc drawing utilities
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:321
void(* blend_image)(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:138
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_overlay.c:141
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:225
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:189
static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
Definition: vf_overlay.c:168
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:136
#define OFFSET(x)
Definition: vf_overlay.c:831
int y
position of overlaid picture
Definition: vf_overlay.c:113
int repeatlast
repeat last second frame
Definition: dualinput.h:37
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:699
uint8_t overlay_has_alpha
Definition: vf_overlay.c:120
#define FLAGS
Definition: vf_overlay.c:832
option
Definition: libkvazaar.c:282
#define isnan(x)
Definition: libm.h:340
uint8_t overlay_is_packed_rgb
Definition: vf_overlay.c:118
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:636
#define A
Definition: vf_overlay.c:89
const char * name
Filter name.
Definition: avfilter.h:148
static int query_formats(AVFilterContext *ctx)
Definition: vf_overlay.c:220
#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:127
int ff_dualinput_init(AVFilterContext *ctx, FFDualInputContext *s)
Definition: dualinput.c:43
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:335
static void blend_image_yuva420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:664
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:208
static void blend_image_rgba(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:704
#define FF_INLINK_IDX(link)
Find the index of a link.
Definition: internal.h:355
static int normalize_xy(double d, int chroma_sub)
Definition: vf_overlay.c:150
static int config_input_main(AVFilterLink *inlink)
Definition: vf_overlay.c:709
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:229
static void blend_image_yuv420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
Definition: vf_overlay.c:659
int vsub
chroma subsampling values
Definition: vf_overlay.c:128
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:887
#define NAN
Definition: math.h:28
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:719
Double input streams helper for filters.
static int config_output(AVFilterLink *outlink)
Definition: vf_overlay.c:387
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:115
An instance of a filter.
Definition: avfilter.h:323
int ff_dualinput_request_frame(FFDualInputContext *s, AVFilterLink *outlink)
Definition: dualinput.c:82
int eof_action
action to take on EOF from source
Definition: vf_overlay.c:134
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: vf_overlay.c:189
static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
Definition: vf_overlay.c:801
int height
Definition: frame.h:252
#define MAIN
Definition: vf_overlay.c:83
#define av_freep(p)
#define av_always_inline
Definition: attributes.h:39
static void eval_expr(AVFilterContext *ctx)
Definition: vf_overlay.c:157
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:2253
internal API functions
EOFAction
Definition: vf_overlay.c:73
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:494
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:689
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:214
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