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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 
107 };
108 
109 typedef struct OverlayContext {
110  const AVClass *class;
111  int x, y; ///< position of overlayed picture
112 
120  int format; ///< OverlayFormat
121  int eval_mode; ///< EvalMode
122 
124 
125  int main_pix_step[4]; ///< steps per pixel for each plane of the main output
126  int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
127  int hsub, vsub; ///< chroma subsampling values
128 
130  char *x_expr, *y_expr;
131 
132  int eof_action; ///< action to take on EOF from source
133 
136 
137 static av_cold void uninit(AVFilterContext *ctx)
138 {
139  OverlayContext *s = ctx->priv;
140 
142  av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
143  av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
144 }
145 
146 static inline int normalize_xy(double d, int chroma_sub)
147 {
148  if (isnan(d))
149  return INT_MAX;
150  return (int)d & ~((1 << chroma_sub) - 1);
151 }
152 
153 static void eval_expr(AVFilterContext *ctx)
154 {
155  OverlayContext *s = ctx->priv;
156 
160  s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
161  s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
162 }
163 
164 static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
165 {
166  int ret;
167  AVExpr *old = NULL;
168 
169  if (*pexpr)
170  old = *pexpr;
171  ret = av_expr_parse(pexpr, expr, var_names,
172  NULL, NULL, NULL, NULL, 0, log_ctx);
173  if (ret < 0) {
174  av_log(log_ctx, AV_LOG_ERROR,
175  "Error when evaluating the expression '%s' for %s\n",
176  expr, option);
177  *pexpr = old;
178  return ret;
179  }
180 
181  av_expr_free(old);
182  return 0;
183 }
184 
185 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
186  char *res, int res_len, int flags)
187 {
188  OverlayContext *s = ctx->priv;
189  int ret;
190 
191  if (!strcmp(cmd, "x"))
192  ret = set_expr(&s->x_pexpr, args, cmd, ctx);
193  else if (!strcmp(cmd, "y"))
194  ret = set_expr(&s->y_pexpr, args, cmd, ctx);
195  else
196  ret = AVERROR(ENOSYS);
197 
198  if (ret < 0)
199  return ret;
200 
201  if (s->eval_mode == EVAL_MODE_INIT) {
202  eval_expr(ctx);
203  av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
204  s->var_values[VAR_X], s->x,
205  s->var_values[VAR_Y], s->y);
206  }
207  return ret;
208 }
209 
211 {
212  OverlayContext *s = ctx->priv;
213 
214  /* overlay formats contains alpha, for avoiding conversion with alpha information loss */
215  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_rgb[] = {
241  };
242  static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
246  };
247 
248  AVFilterFormats *main_formats;
249  AVFilterFormats *overlay_formats;
250 
251  switch (s->format) {
253  main_formats = ff_make_format_list(main_pix_fmts_yuv420);
254  overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420);
255  break;
257  main_formats = ff_make_format_list(main_pix_fmts_yuv422);
258  overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422);
259  break;
261  main_formats = ff_make_format_list(main_pix_fmts_yuv444);
262  overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444);
263  break;
264  case OVERLAY_FORMAT_RGB:
265  main_formats = ff_make_format_list(main_pix_fmts_rgb);
266  overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb);
267  break;
268  default:
269  av_assert0(0);
270  }
271 
272  ff_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats);
273  ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);
274  ff_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats );
275 
276  return 0;
277 }
278 
279 static const enum AVPixelFormat alpha_pix_fmts[] = {
283 };
284 
285 static int config_input_main(AVFilterLink *inlink)
286 {
287  OverlayContext *s = inlink->dst->priv;
288  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
289 
291 
292  s->hsub = pix_desc->log2_chroma_w;
293  s->vsub = pix_desc->log2_chroma_h;
294 
295  s->main_is_packed_rgb =
296  ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
298  return 0;
299 }
300 
302 {
303  AVFilterContext *ctx = inlink->dst;
304  OverlayContext *s = inlink->dst->priv;
305  int ret;
306  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
307 
309 
310  /* Finish the configuration by evaluating the expressions
311  now when both inputs are configured. */
312  s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
313  s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
316  s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
317  s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
318  s->var_values[VAR_X] = NAN;
319  s->var_values[VAR_Y] = NAN;
320  s->var_values[VAR_N] = 0;
321  s->var_values[VAR_T] = NAN;
322  s->var_values[VAR_POS] = NAN;
323 
324  if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
325  (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
326  return ret;
327 
329  ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
331 
332  if (s->eval_mode == EVAL_MODE_INIT) {
333  eval_expr(ctx);
334  av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
335  s->var_values[VAR_X], s->x,
336  s->var_values[VAR_Y], s->y);
337  }
338 
339  av_log(ctx, AV_LOG_VERBOSE,
340  "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s eof_action:%s\n",
341  ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
343  ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
346  return 0;
347 }
348 
349 static int config_output(AVFilterLink *outlink)
350 {
351  AVFilterContext *ctx = outlink->src;
352  OverlayContext *s = ctx->priv;
353  int ret;
354 
355  if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
356  return ret;
357 
358  outlink->w = ctx->inputs[MAIN]->w;
359  outlink->h = ctx->inputs[MAIN]->h;
360  outlink->time_base = ctx->inputs[MAIN]->time_base;
361 
362  return 0;
363 }
364 
365 // divide by 255 and round to nearest
366 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
367 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
368 
369 // calculate the unpremultiplied alpha, applying the general equation:
370 // alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
371 // (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
372 // ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
373 #define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
374 
375 /**
376  * Blend image in src to destination buffer dst at position (x, y).
377  */
378 static void blend_image(AVFilterContext *ctx,
379  AVFrame *dst, const AVFrame *src,
380  int x, int y)
381 {
382  OverlayContext *s = ctx->priv;
383  int i, imax, j, jmax, k, kmax;
384  const int src_w = src->width;
385  const int src_h = src->height;
386  const int dst_w = dst->width;
387  const int dst_h = dst->height;
388 
389  if (x >= dst_w || x+src_w < 0 ||
390  y >= dst_h || y+src_h < 0)
391  return; /* no intersection */
392 
393  if (s->main_is_packed_rgb) {
394  uint8_t alpha; ///< the amount of overlay to blend on to main
395  const int dr = s->main_rgba_map[R];
396  const int dg = s->main_rgba_map[G];
397  const int db = s->main_rgba_map[B];
398  const int da = s->main_rgba_map[A];
399  const int dstep = s->main_pix_step[0];
400  const int sr = s->overlay_rgba_map[R];
401  const int sg = s->overlay_rgba_map[G];
402  const int sb = s->overlay_rgba_map[B];
403  const int sa = s->overlay_rgba_map[A];
404  const int sstep = s->overlay_pix_step[0];
405  const int main_has_alpha = s->main_has_alpha;
406  uint8_t *s, *sp, *d, *dp;
407 
408  i = FFMAX(-y, 0);
409  sp = src->data[0] + i * src->linesize[0];
410  dp = dst->data[0] + (y+i) * dst->linesize[0];
411 
412  for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
413  j = FFMAX(-x, 0);
414  s = sp + j * sstep;
415  d = dp + (x+j) * dstep;
416 
417  for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
418  alpha = s[sa];
419 
420  // if the main channel has an alpha channel, alpha has to be calculated
421  // to create an un-premultiplied (straight) alpha value
422  if (main_has_alpha && alpha != 0 && alpha != 255) {
423  uint8_t alpha_d = d[da];
424  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
425  }
426 
427  switch (alpha) {
428  case 0:
429  break;
430  case 255:
431  d[dr] = s[sr];
432  d[dg] = s[sg];
433  d[db] = s[sb];
434  break;
435  default:
436  // main_value = main_value * (1 - alpha) + overlay_value * alpha
437  // since alpha is in the range 0-255, the result must divided by 255
438  d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + s[sr] * alpha);
439  d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + s[sg] * alpha);
440  d[db] = FAST_DIV255(d[db] * (255 - alpha) + s[sb] * alpha);
441  }
442  if (main_has_alpha) {
443  switch (alpha) {
444  case 0:
445  break;
446  case 255:
447  d[da] = s[sa];
448  break;
449  default:
450  // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
451  d[da] += FAST_DIV255((255 - d[da]) * s[sa]);
452  }
453  }
454  d += dstep;
455  s += sstep;
456  }
457  dp += dst->linesize[0];
458  sp += src->linesize[0];
459  }
460  } else {
461  const int main_has_alpha = s->main_has_alpha;
462  if (main_has_alpha) {
463  uint8_t alpha; ///< the amount of overlay to blend on to main
464  uint8_t *s, *sa, *d, *da;
465 
466  i = FFMAX(-y, 0);
467  sa = src->data[3] + i * src->linesize[3];
468  da = dst->data[3] + (y+i) * dst->linesize[3];
469 
470  for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
471  j = FFMAX(-x, 0);
472  s = sa + j;
473  d = da + x+j;
474 
475  for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
476  alpha = *s;
477  if (alpha != 0 && alpha != 255) {
478  uint8_t alpha_d = *d;
479  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
480  }
481  switch (alpha) {
482  case 0:
483  break;
484  case 255:
485  *d = *s;
486  break;
487  default:
488  // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
489  *d += FAST_DIV255((255 - *d) * *s);
490  }
491  d += 1;
492  s += 1;
493  }
494  da += dst->linesize[3];
495  sa += src->linesize[3];
496  }
497  }
498  for (i = 0; i < 3; i++) {
499  int hsub = i ? s->hsub : 0;
500  int vsub = i ? s->vsub : 0;
501  int src_wp = FF_CEIL_RSHIFT(src_w, hsub);
502  int src_hp = FF_CEIL_RSHIFT(src_h, vsub);
503  int dst_wp = FF_CEIL_RSHIFT(dst_w, hsub);
504  int dst_hp = FF_CEIL_RSHIFT(dst_h, vsub);
505  int yp = y>>vsub;
506  int xp = x>>hsub;
507  uint8_t *s, *sp, *d, *dp, *a, *ap;
508 
509  j = FFMAX(-yp, 0);
510  sp = src->data[i] + j * src->linesize[i];
511  dp = dst->data[i] + (yp+j) * dst->linesize[i];
512  ap = src->data[3] + (j<<vsub) * src->linesize[3];
513 
514  for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
515  k = FFMAX(-xp, 0);
516  d = dp + xp+k;
517  s = sp + k;
518  a = ap + (k<<hsub);
519 
520  for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
521  int alpha_v, alpha_h, alpha;
522 
523  // average alpha for color components, improve quality
524  if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
525  alpha = (a[0] + a[src->linesize[3]] +
526  a[1] + a[src->linesize[3]+1]) >> 2;
527  } else if (hsub || vsub) {
528  alpha_h = hsub && k+1 < src_wp ?
529  (a[0] + a[1]) >> 1 : a[0];
530  alpha_v = vsub && j+1 < src_hp ?
531  (a[0] + a[src->linesize[3]]) >> 1 : a[0];
532  alpha = (alpha_v + alpha_h) >> 1;
533  } else
534  alpha = a[0];
535  // if the main channel has an alpha channel, alpha has to be calculated
536  // to create an un-premultiplied (straight) alpha value
537  if (main_has_alpha && alpha != 0 && alpha != 255) {
538  // average alpha for color components, improve quality
539  uint8_t alpha_d;
540  if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
541  alpha_d = (d[0] + d[src->linesize[3]] +
542  d[1] + d[src->linesize[3]+1]) >> 2;
543  } else if (hsub || vsub) {
544  alpha_h = hsub && k+1 < src_wp ?
545  (d[0] + d[1]) >> 1 : d[0];
546  alpha_v = vsub && j+1 < src_hp ?
547  (d[0] + d[src->linesize[3]]) >> 1 : d[0];
548  alpha_d = (alpha_v + alpha_h) >> 1;
549  } else
550  alpha_d = d[0];
551  alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
552  }
553  *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
554  s++;
555  d++;
556  a += 1 << hsub;
557  }
558  dp += dst->linesize[i];
559  sp += src->linesize[i];
560  ap += (1 << vsub) * src->linesize[3];
561  }
562  }
563  }
564 }
565 
566 static AVFrame *do_blend(AVFilterContext *ctx, AVFrame *mainpic,
567  const AVFrame *second)
568 {
569  OverlayContext *s = ctx->priv;
570  AVFilterLink *inlink = ctx->inputs[0];
571 
572  if (s->eval_mode == EVAL_MODE_FRAME) {
573  int64_t pos = av_frame_get_pkt_pos(mainpic);
574 
575  s->var_values[VAR_N] = inlink->frame_count;
576  s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
577  NAN : mainpic->pts * av_q2d(inlink->time_base);
578  s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
579 
580  eval_expr(ctx);
581  av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
583  s->var_values[VAR_X], s->x,
584  s->var_values[VAR_Y], s->y);
585  }
586 
587  blend_image(ctx, mainpic, second, s->x, s->y);
588  return mainpic;
589 }
590 
591 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
592 {
593  OverlayContext *s = inlink->dst->priv;
594  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));
595  return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
596 }
597 
598 static int request_frame(AVFilterLink *outlink)
599 {
600  OverlayContext *s = outlink->src->priv;
601  return ff_dualinput_request_frame(&s->dinput, outlink);
602 }
603 
604 static av_cold int init(AVFilterContext *ctx)
605 {
606  OverlayContext *s = ctx->priv;
607 
608  if (s->allow_packed_rgb) {
609  av_log(ctx, AV_LOG_WARNING,
610  "The rgb option is deprecated and is overriding the format option, use format instead\n");
612  }
613  if (!s->dinput.repeatlast || s->eof_action == EOF_ACTION_PASS) {
614  s->dinput.repeatlast = 0;
616  }
617  if (s->dinput.shortest || s->eof_action == EOF_ACTION_ENDALL) {
618  s->dinput.shortest = 1;
620  }
621 
622  s->dinput.process = do_blend;
623  return 0;
624 }
625 
626 #define OFFSET(x) offsetof(OverlayContext, x)
627 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
628 
629 static const AVOption overlay_options[] = {
630  { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
631  { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
632  { "eof_action", "Action to take when encountering EOF from secondary input ",
633  OFFSET(eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
634  EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
635  { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
636  { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
637  { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
638  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
639  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
640  { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
641  { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
642  { "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
643  { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
644  { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
645  { "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" },
646  { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
647  { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
648  { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
649  { NULL }
650 };
651 
652 AVFILTER_DEFINE_CLASS(overlay);
653 
655  {
656  .name = "main",
657  .type = AVMEDIA_TYPE_VIDEO,
658  .config_props = config_input_main,
659  .filter_frame = filter_frame,
660  .needs_writable = 1,
661  },
662  {
663  .name = "overlay",
664  .type = AVMEDIA_TYPE_VIDEO,
665  .config_props = config_input_overlay,
666  .filter_frame = filter_frame,
667  },
668  { NULL }
669 };
670 
672  {
673  .name = "default",
674  .type = AVMEDIA_TYPE_VIDEO,
675  .config_props = config_output,
676  .request_frame = request_frame,
677  },
678  { NULL }
679 };
680 
682  .name = "overlay",
683  .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
684  .init = init,
685  .uninit = uninit,
686  .priv_size = sizeof(OverlayContext),
687  .priv_class = &overlay_class,
690  .inputs = avfilter_vf_overlay_inputs,
691  .outputs = avfilter_vf_overlay_outputs,
693 };