2 * Copyright (c) 2010 Stefano Sabatini
3 * Copyright (c) 2010 Baptiste Coudurier
4 * Copyright (c) 2007 Bobby Bingham
6 * This file is part of FFmpeg.
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.
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.
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
25 * overlay one video on top of another
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"
39 #include "dualinput.h"
40 #include "drawutils.h"
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
52 "n", ///< number of frame
53 "pos", ///< position in the file
54 "t", ///< timestamp expressed in seconds
61 VAR_OVERLAY_W, VAR_OW,
62 VAR_OVERLAY_H, VAR_OH,
79 static const char * const eof_action_str[] = {
80 "repeat", "endall", "pass"
102 OVERLAY_FORMAT_YUV420,
103 OVERLAY_FORMAT_YUV422,
104 OVERLAY_FORMAT_YUV444,
109 typedef struct OverlayContext {
110 const AVClass *class;
111 int x, y; ///< position of overlaid picture
113 int allow_packed_rgb;
114 uint8_t main_is_packed_rgb;
115 uint8_t main_rgba_map[4];
116 uint8_t main_has_alpha;
117 uint8_t overlay_is_packed_rgb;
118 uint8_t overlay_rgba_map[4];
119 uint8_t overlay_has_alpha;
120 int format; ///< OverlayFormat
121 int eval_mode; ///< EvalMode
123 FFDualInputContext dinput;
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
129 double var_values[VAR_VARS_NB];
130 char *x_expr, *y_expr;
132 int eof_action; ///< action to take on EOF from source
134 AVExpr *x_pexpr, *y_pexpr;
136 void (*blend_image)(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y);
139 static av_cold void uninit(AVFilterContext *ctx)
141 OverlayContext *s = ctx->priv;
143 ff_dualinput_uninit(&s->dinput);
144 av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
145 av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
148 static inline int normalize_xy(double d, int chroma_sub)
152 return (int)d & ~((1 << chroma_sub) - 1);
155 static void eval_expr(AVFilterContext *ctx)
157 OverlayContext *s = ctx->priv;
159 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
160 s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
161 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
162 s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
163 s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
166 static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
173 ret = av_expr_parse(pexpr, expr, var_names,
174 NULL, NULL, NULL, NULL, 0, log_ctx);
176 av_log(log_ctx, AV_LOG_ERROR,
177 "Error when evaluating the expression '%s' for %s\n",
187 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
188 char *res, int res_len, int flags)
190 OverlayContext *s = ctx->priv;
193 if (!strcmp(cmd, "x"))
194 ret = set_expr(&s->x_pexpr, args, cmd, ctx);
195 else if (!strcmp(cmd, "y"))
196 ret = set_expr(&s->y_pexpr, args, cmd, ctx);
198 ret = AVERROR(ENOSYS);
203 if (s->eval_mode == EVAL_MODE_INIT) {
205 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
206 s->var_values[VAR_X], s->x,
207 s->var_values[VAR_Y], s->y);
212 static int query_formats(AVFilterContext *ctx)
214 OverlayContext *s = ctx->priv;
216 /* overlay formats contains alpha, for avoiding conversion with alpha information loss */
217 static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
218 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
220 static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
221 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
224 static const enum AVPixelFormat main_pix_fmts_yuv422[] = {
225 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
227 static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = {
228 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
231 static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
232 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
234 static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
235 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
238 static const enum AVPixelFormat main_pix_fmts_rgb[] = {
239 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
240 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
241 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
244 static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
245 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
246 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
250 AVFilterFormats *main_formats = NULL;
251 AVFilterFormats *overlay_formats = NULL;
255 case OVERLAY_FORMAT_YUV420:
256 if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv420)) ||
257 !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420))) {
258 ret = AVERROR(ENOMEM);
262 case OVERLAY_FORMAT_YUV422:
263 if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv422)) ||
264 !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422))) {
265 ret = AVERROR(ENOMEM);
269 case OVERLAY_FORMAT_YUV444:
270 if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv444)) ||
271 !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444))) {
272 ret = AVERROR(ENOMEM);
276 case OVERLAY_FORMAT_RGB:
277 if (!(main_formats = ff_make_format_list(main_pix_fmts_rgb)) ||
278 !(overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb))) {
279 ret = AVERROR(ENOMEM);
287 if ((ret = ff_formats_ref(main_formats , &ctx->inputs[MAIN]->out_formats )) < 0 ||
288 (ret = ff_formats_ref(overlay_formats, &ctx->inputs[OVERLAY]->out_formats)) < 0 ||
289 (ret = ff_formats_ref(main_formats , &ctx->outputs[MAIN]->in_formats )) < 0)
295 av_freep(&main_formats->formats);
296 av_freep(&main_formats);
298 av_freep(&overlay_formats->formats);
299 av_freep(&overlay_formats);
303 static const enum AVPixelFormat alpha_pix_fmts[] = {
304 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
305 AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,
306 AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE
309 static int config_input_overlay(AVFilterLink *inlink)
311 AVFilterContext *ctx = inlink->dst;
312 OverlayContext *s = inlink->dst->priv;
314 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
316 av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc);
318 /* Finish the configuration by evaluating the expressions
319 now when both inputs are configured. */
320 s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
321 s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
322 s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
323 s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
324 s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
325 s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
326 s->var_values[VAR_X] = NAN;
327 s->var_values[VAR_Y] = NAN;
328 s->var_values[VAR_N] = 0;
329 s->var_values[VAR_T] = NAN;
330 s->var_values[VAR_POS] = NAN;
332 if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
333 (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
336 s->overlay_is_packed_rgb =
337 ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
338 s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
340 if (s->eval_mode == EVAL_MODE_INIT) {
342 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
343 s->var_values[VAR_X], s->x,
344 s->var_values[VAR_Y], s->y);
347 av_log(ctx, AV_LOG_VERBOSE,
348 "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s eof_action:%s\n",
349 ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
350 av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
351 ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
352 av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format),
353 eof_action_str[s->eof_action]);
357 static int config_output(AVFilterLink *outlink)
359 AVFilterContext *ctx = outlink->src;
360 OverlayContext *s = ctx->priv;
363 if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
366 outlink->w = ctx->inputs[MAIN]->w;
367 outlink->h = ctx->inputs[MAIN]->h;
368 outlink->time_base = ctx->inputs[MAIN]->time_base;
373 // divide by 255 and round to nearest
374 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
375 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
377 // calculate the unpremultiplied alpha, applying the general equation:
378 // alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
379 // (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
380 // ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
381 #define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
384 * Blend image in src to destination buffer dst at position (x, y).
387 static void blend_image_packed_rgb(AVFilterContext *ctx,
388 AVFrame *dst, const AVFrame *src,
391 OverlayContext *s = ctx->priv;
392 int i, imax, j, jmax;
393 const int src_w = src->width;
394 const int src_h = src->height;
395 const int dst_w = dst->width;
396 const int dst_h = dst->height;
397 uint8_t alpha; ///< the amount of overlay to blend on to main
398 const int dr = s->main_rgba_map[R];
399 const int dg = s->main_rgba_map[G];
400 const int db = s->main_rgba_map[B];
401 const int da = s->main_rgba_map[A];
402 const int dstep = s->main_pix_step[0];
403 const int sr = s->overlay_rgba_map[R];
404 const int sg = s->overlay_rgba_map[G];
405 const int sb = s->overlay_rgba_map[B];
406 const int sa = s->overlay_rgba_map[A];
407 const int sstep = s->overlay_pix_step[0];
408 const int main_has_alpha = s->main_has_alpha;
409 uint8_t *S, *sp, *d, *dp;
412 sp = src->data[0] + i * src->linesize[0];
413 dp = dst->data[0] + (y+i) * dst->linesize[0];
415 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
418 d = dp + (x+j) * dstep;
420 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
423 // if the main channel has an alpha channel, alpha has to be calculated
424 // to create an un-premultiplied (straight) alpha value
425 if (main_has_alpha && alpha != 0 && alpha != 255) {
426 uint8_t alpha_d = d[da];
427 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
439 // main_value = main_value * (1 - alpha) + overlay_value * alpha
440 // since alpha is in the range 0-255, the result must divided by 255
441 d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + S[sr] * alpha);
442 d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + S[sg] * alpha);
443 d[db] = FAST_DIV255(d[db] * (255 - alpha) + S[sb] * alpha);
445 if (main_has_alpha) {
453 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
454 d[da] += FAST_DIV255((255 - d[da]) * S[sa]);
460 dp += dst->linesize[0];
461 sp += src->linesize[0];
465 static av_always_inline void blend_plane(AVFilterContext *ctx,
466 AVFrame *dst, const AVFrame *src,
467 int src_w, int src_h,
468 int dst_w, int dst_h,
469 int i, int hsub, int vsub,
473 int src_wp = AV_CEIL_RSHIFT(src_w, hsub);
474 int src_hp = AV_CEIL_RSHIFT(src_h, vsub);
475 int dst_wp = AV_CEIL_RSHIFT(dst_w, hsub);
476 int dst_hp = AV_CEIL_RSHIFT(dst_h, vsub);
479 uint8_t *s, *sp, *d, *dp, *a, *ap;
480 int jmax, j, k, kmax;
483 sp = src->data[i] + j * src->linesize[i];
484 dp = dst->data[i] + (yp+j) * dst->linesize[i];
485 ap = src->data[3] + (j<<vsub) * src->linesize[3];
487 for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
493 for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
494 int alpha_v, alpha_h, alpha;
496 // average alpha for color components, improve quality
497 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
498 alpha = (a[0] + a[src->linesize[3]] +
499 a[1] + a[src->linesize[3]+1]) >> 2;
500 } else if (hsub || vsub) {
501 alpha_h = hsub && k+1 < src_wp ?
502 (a[0] + a[1]) >> 1 : a[0];
503 alpha_v = vsub && j+1 < src_hp ?
504 (a[0] + a[src->linesize[3]]) >> 1 : a[0];
505 alpha = (alpha_v + alpha_h) >> 1;
508 // if the main channel has an alpha channel, alpha has to be calculated
509 // to create an un-premultiplied (straight) alpha value
510 if (main_has_alpha && alpha != 0 && alpha != 255) {
511 // average alpha for color components, improve quality
513 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
514 alpha_d = (d[0] + d[src->linesize[3]] +
515 d[1] + d[src->linesize[3]+1]) >> 2;
516 } else if (hsub || vsub) {
517 alpha_h = hsub && k+1 < src_wp ?
518 (d[0] + d[1]) >> 1 : d[0];
519 alpha_v = vsub && j+1 < src_hp ?
520 (d[0] + d[src->linesize[3]]) >> 1 : d[0];
521 alpha_d = (alpha_v + alpha_h) >> 1;
524 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
526 *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
531 dp += dst->linesize[i];
532 sp += src->linesize[i];
533 ap += (1 << vsub) * src->linesize[3];
537 static inline void alpha_composite(const AVFrame *src, const AVFrame *dst,
538 int src_w, int src_h,
539 int dst_w, int dst_h,
542 uint8_t alpha; ///< the amount of overlay to blend on to main
543 uint8_t *s, *sa, *d, *da;
544 int i, imax, j, jmax;
547 sa = src->data[3] + i * src->linesize[3];
548 da = dst->data[3] + (y+i) * dst->linesize[3];
550 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
555 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
557 if (alpha != 0 && alpha != 255) {
558 uint8_t alpha_d = *d;
559 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
568 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
569 *d += FAST_DIV255((255 - *d) * *s);
574 da += dst->linesize[3];
575 sa += src->linesize[3];
579 static av_always_inline void blend_image_yuv(AVFilterContext *ctx,
580 AVFrame *dst, const AVFrame *src,
585 const int src_w = src->width;
586 const int src_h = src->height;
587 const int dst_w = dst->width;
588 const int dst_h = dst->height;
591 alpha_composite(src, dst, src_w, src_h, dst_w, dst_h, x, y);
593 blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha);
594 blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha);
595 blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha);
598 static void blend_image_yuv420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
600 OverlayContext *s = ctx->priv;
602 blend_image_yuv(ctx, dst, src, 1, 1, s->main_has_alpha, x, y);
605 static void blend_image_yuv422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
607 OverlayContext *s = ctx->priv;
609 blend_image_yuv(ctx, dst, src, 1, 0, s->main_has_alpha, x, y);
612 static void blend_image_yuv444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
614 OverlayContext *s = ctx->priv;
616 blend_image_yuv(ctx, dst, src, 0, 0, s->main_has_alpha, x, y);
619 static int config_input_main(AVFilterLink *inlink)
621 OverlayContext *s = inlink->dst->priv;
622 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
624 av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
626 s->hsub = pix_desc->log2_chroma_w;
627 s->vsub = pix_desc->log2_chroma_h;
629 s->main_is_packed_rgb =
630 ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
631 s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
633 case OVERLAY_FORMAT_YUV420:
634 s->blend_image = blend_image_yuv420;
636 case OVERLAY_FORMAT_YUV422:
637 s->blend_image = blend_image_yuv422;
639 case OVERLAY_FORMAT_YUV444:
640 s->blend_image = blend_image_yuv444;
642 case OVERLAY_FORMAT_RGB:
643 s->blend_image = blend_image_packed_rgb;
649 static AVFrame *do_blend(AVFilterContext *ctx, AVFrame *mainpic,
650 const AVFrame *second)
652 OverlayContext *s = ctx->priv;
653 AVFilterLink *inlink = ctx->inputs[0];
655 if (s->eval_mode == EVAL_MODE_FRAME) {
656 int64_t pos = av_frame_get_pkt_pos(mainpic);
658 s->var_values[VAR_N] = inlink->frame_count;
659 s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
660 NAN : mainpic->pts * av_q2d(inlink->time_base);
661 s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
663 s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = second->width;
664 s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = second->height;
665 s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = mainpic->width;
666 s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = mainpic->height;
669 av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
670 s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
671 s->var_values[VAR_X], s->x,
672 s->var_values[VAR_Y], s->y);
675 if (s->x < mainpic->width && s->x + second->width >= 0 ||
676 s->y < mainpic->height && s->y + second->height >= 0)
677 s->blend_image(ctx, mainpic, second, s->x, s->y);
681 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
683 OverlayContext *s = inlink->dst->priv;
684 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));
685 return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
688 static int request_frame(AVFilterLink *outlink)
690 OverlayContext *s = outlink->src->priv;
691 return ff_dualinput_request_frame(&s->dinput, outlink);
694 static av_cold int init(AVFilterContext *ctx)
696 OverlayContext *s = ctx->priv;
698 if (s->allow_packed_rgb) {
699 av_log(ctx, AV_LOG_WARNING,
700 "The rgb option is deprecated and is overriding the format option, use format instead\n");
701 s->format = OVERLAY_FORMAT_RGB;
703 if (!s->dinput.repeatlast || s->eof_action == EOF_ACTION_PASS) {
704 s->dinput.repeatlast = 0;
705 s->eof_action = EOF_ACTION_PASS;
707 if (s->dinput.shortest || s->eof_action == EOF_ACTION_ENDALL) {
708 s->dinput.shortest = 1;
709 s->eof_action = EOF_ACTION_ENDALL;
712 s->dinput.process = do_blend;
716 #define OFFSET(x) offsetof(OverlayContext, x)
717 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
719 static const AVOption overlay_options[] = {
720 { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
721 { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
722 { "eof_action", "Action to take when encountering EOF from secondary input ",
723 OFFSET(eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
724 EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
725 { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
726 { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
727 { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
728 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
729 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
730 { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
731 { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
732 { "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
733 { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
734 { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
735 { "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" },
736 { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
737 { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
738 { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
742 AVFILTER_DEFINE_CLASS(overlay);
744 static const AVFilterPad avfilter_vf_overlay_inputs[] = {
747 .type = AVMEDIA_TYPE_VIDEO,
748 .config_props = config_input_main,
749 .filter_frame = filter_frame,
754 .type = AVMEDIA_TYPE_VIDEO,
755 .config_props = config_input_overlay,
756 .filter_frame = filter_frame,
761 static const AVFilterPad avfilter_vf_overlay_outputs[] = {
764 .type = AVMEDIA_TYPE_VIDEO,
765 .config_props = config_output,
766 .request_frame = request_frame,
771 AVFilter ff_vf_overlay = {
773 .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
776 .priv_size = sizeof(OverlayContext),
777 .priv_class = &overlay_class,
778 .query_formats = query_formats,
779 .process_command = process_command,
780 .inputs = avfilter_vf_overlay_inputs,
781 .outputs = avfilter_vf_overlay_outputs,
782 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,