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
32 #include "libavutil/common.h"
33 #include "libavutil/eval.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/pixdesc.h"
37 #include "libavutil/imgutils.h"
38 #include "libavutil/mathematics.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/timestamp.h"
42 #include "bufferqueue.h"
43 #include "drawutils.h"
46 static const char *const var_names[] = {
47 "main_w", "W", ///< width of the main video
48 "main_h", "H", ///< height of the main video
49 "overlay_w", "w", ///< width of the overlay video
50 "overlay_h", "h", ///< height of the overlay video
55 "n", ///< number of frame
56 "pos", ///< position in the file
57 "t", ///< timestamp expressed in seconds
64 VAR_OVERLAY_W, VAR_OW,
65 VAR_OVERLAY_H, VAR_OH,
90 int x, y; ///< position of overlayed picture
91 double enable; ///< tells if blending is enabled
94 uint8_t frame_requested;
96 uint8_t main_is_packed_rgb;
97 uint8_t main_rgba_map[4];
98 uint8_t main_has_alpha;
99 uint8_t overlay_is_packed_rgb;
100 uint8_t overlay_rgba_map[4];
101 uint8_t overlay_has_alpha;
102 enum OverlayFormat { OVERLAY_FORMAT_YUV420, OVERLAY_FORMAT_YUV444, OVERLAY_FORMAT_RGB, OVERLAY_FORMAT_NB} format;
103 enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode;
106 struct FFBufQueue queue_main;
107 struct FFBufQueue queue_over;
109 int main_pix_step[4]; ///< steps per pixel for each plane of the main output
110 int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
111 int hsub, vsub; ///< chroma subsampling values
112 int shortest; ///< terminate stream when the shortest input terminates
113 int repeatlast; ///< repeat last overlay frame
115 double var_values[VAR_VARS_NB];
116 char *x_expr, *y_expr;
118 AVExpr *x_pexpr, *y_pexpr, *enable_pexpr;
121 static av_cold int init(AVFilterContext *ctx)
123 OverlayContext *over = ctx->priv;
125 if (over->allow_packed_rgb) {
126 av_log(ctx, AV_LOG_WARNING,
127 "The rgb option is deprecated and is overriding the format option, use format instead\n");
128 over->format = OVERLAY_FORMAT_RGB;
133 static av_cold void uninit(AVFilterContext *ctx)
135 OverlayContext *over = ctx->priv;
137 av_frame_free(&over->overpicref);
138 ff_bufqueue_discard_all(&over->queue_main);
139 ff_bufqueue_discard_all(&over->queue_over);
140 av_expr_free(over->x_pexpr); over->x_pexpr = NULL;
141 av_expr_free(over->y_pexpr); over->y_pexpr = NULL;
142 av_expr_free(over->enable_pexpr); over->enable_pexpr = NULL;
145 static inline int normalize_xy(double d, int chroma_sub)
149 return (int)d & ~((1 << chroma_sub) - 1);
152 enum EvalTarget { EVAL_XY, EVAL_ENABLE, EVAL_ALL };
154 static void eval_expr(AVFilterContext *ctx, enum EvalTarget eval_tgt)
156 OverlayContext *over = ctx->priv;
158 if (eval_tgt == EVAL_XY || eval_tgt == EVAL_ALL) {
159 over->var_values[VAR_X] = av_expr_eval(over->x_pexpr, over->var_values, NULL);
160 over->var_values[VAR_Y] = av_expr_eval(over->y_pexpr, over->var_values, NULL);
161 over->var_values[VAR_X] = av_expr_eval(over->x_pexpr, over->var_values, NULL);
162 over->x = normalize_xy(over->var_values[VAR_X], over->hsub);
163 over->y = normalize_xy(over->var_values[VAR_Y], over->vsub);
165 if (eval_tgt == EVAL_ENABLE || eval_tgt == EVAL_ALL) {
166 over->enable = av_expr_eval(over->enable_pexpr, over->var_values, NULL);
170 static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
177 ret = av_expr_parse(pexpr, expr, var_names,
178 NULL, NULL, NULL, NULL, 0, log_ctx);
180 av_log(log_ctx, AV_LOG_ERROR,
181 "Error when evaluating the expression '%s' for %s\n",
191 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
192 char *res, int res_len, int flags)
194 OverlayContext *over = ctx->priv;
197 if (!strcmp(cmd, "x"))
198 ret = set_expr(&over->x_pexpr, args, cmd, ctx);
199 else if (!strcmp(cmd, "y"))
200 ret = set_expr(&over->y_pexpr, args, cmd, ctx);
201 else if (!strcmp(cmd, "enable"))
202 ret = set_expr(&over->enable_pexpr, args, cmd, ctx);
204 ret = AVERROR(ENOSYS);
209 if (over->eval_mode == EVAL_MODE_INIT) {
210 eval_expr(ctx, EVAL_ALL);
211 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d enable:%f\n",
212 over->var_values[VAR_X], over->x,
213 over->var_values[VAR_Y], over->y,
219 static int query_formats(AVFilterContext *ctx)
221 OverlayContext *over = ctx->priv;
223 /* overlay formats contains alpha, for avoiding conversion with alpha information loss */
224 static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
225 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
227 static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
228 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
231 static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
232 AV_PIX_FMT_YUV444P, 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;
251 AVFilterFormats *overlay_formats;
253 switch (over->format) {
254 case OVERLAY_FORMAT_YUV420:
255 main_formats = ff_make_format_list(main_pix_fmts_yuv420);
256 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420);
258 case OVERLAY_FORMAT_YUV444:
259 main_formats = ff_make_format_list(main_pix_fmts_yuv444);
260 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444);
262 case OVERLAY_FORMAT_RGB:
263 main_formats = ff_make_format_list(main_pix_fmts_rgb);
264 overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb);
270 ff_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats);
271 ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);
272 ff_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats );
277 static const enum AVPixelFormat alpha_pix_fmts[] = {
278 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA444P,
279 AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,
280 AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE
283 static int config_input_main(AVFilterLink *inlink)
285 OverlayContext *over = inlink->dst->priv;
286 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
288 av_image_fill_max_pixsteps(over->main_pix_step, NULL, pix_desc);
290 over->hsub = pix_desc->log2_chroma_w;
291 over->vsub = pix_desc->log2_chroma_h;
293 over->main_is_packed_rgb =
294 ff_fill_rgba_map(over->main_rgba_map, inlink->format) >= 0;
295 over->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
299 static int config_input_overlay(AVFilterLink *inlink)
301 AVFilterContext *ctx = inlink->dst;
302 OverlayContext *over = inlink->dst->priv;
304 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
306 av_image_fill_max_pixsteps(over->overlay_pix_step, NULL, pix_desc);
308 /* Finish the configuration by evaluating the expressions
309 now when both inputs are configured. */
310 over->var_values[VAR_MAIN_W ] = over->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
311 over->var_values[VAR_MAIN_H ] = over->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
312 over->var_values[VAR_OVERLAY_W] = over->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
313 over->var_values[VAR_OVERLAY_H] = over->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
314 over->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
315 over->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
316 over->var_values[VAR_X] = NAN;
317 over->var_values[VAR_Y] = NAN;
318 over->var_values[VAR_N] = 0;
319 over->var_values[VAR_T] = NAN;
320 over->var_values[VAR_POS] = NAN;
322 if ((ret = set_expr(&over->x_pexpr, over->x_expr, "x", ctx)) < 0 ||
323 (ret = set_expr(&over->y_pexpr, over->y_expr, "y", ctx)) < 0 ||
324 (ret = set_expr(&over->enable_pexpr, over->enable_expr, "enable", ctx)) < 0)
327 over->overlay_is_packed_rgb =
328 ff_fill_rgba_map(over->overlay_rgba_map, inlink->format) >= 0;
329 over->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
331 if (over->eval_mode == EVAL_MODE_INIT) {
332 eval_expr(ctx, EVAL_ALL);
333 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d enable:%f\n",
334 over->var_values[VAR_X], over->x,
335 over->var_values[VAR_Y], over->y,
339 av_log(ctx, AV_LOG_VERBOSE,
340 "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s\n",
341 ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
342 av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
343 ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
344 av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format));
348 static int config_output(AVFilterLink *outlink)
350 AVFilterContext *ctx = outlink->src;
352 outlink->w = ctx->inputs[MAIN]->w;
353 outlink->h = ctx->inputs[MAIN]->h;
354 outlink->time_base = ctx->inputs[MAIN]->time_base;
359 // divide by 255 and round to nearest
360 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
361 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
363 // calculate the unpremultiplied alpha, applying the general equation:
364 // alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
365 // (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
366 // ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
367 #define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
370 * Blend image in src to destination buffer dst at position (x, y).
372 static void blend_image(AVFilterContext *ctx,
373 AVFrame *dst, AVFrame *src,
376 OverlayContext *over = ctx->priv;
377 int i, imax, j, jmax, k, kmax;
378 const int src_w = src->width;
379 const int src_h = src->height;
380 const int dst_w = dst->width;
381 const int dst_h = dst->height;
383 if (x >= dst_w || x+dst_w < 0 ||
384 y >= dst_h || y+dst_h < 0)
385 return; /* no intersection */
387 if (over->main_is_packed_rgb) {
388 uint8_t alpha; ///< the amount of overlay to blend on to main
389 const int dr = over->main_rgba_map[R];
390 const int dg = over->main_rgba_map[G];
391 const int db = over->main_rgba_map[B];
392 const int da = over->main_rgba_map[A];
393 const int dstep = over->main_pix_step[0];
394 const int sr = over->overlay_rgba_map[R];
395 const int sg = over->overlay_rgba_map[G];
396 const int sb = over->overlay_rgba_map[B];
397 const int sa = over->overlay_rgba_map[A];
398 const int sstep = over->overlay_pix_step[0];
399 const int main_has_alpha = over->main_has_alpha;
400 uint8_t *s, *sp, *d, *dp;
403 sp = src->data[0] + i * src->linesize[0];
404 dp = dst->data[0] + (y+i) * dst->linesize[0];
406 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
409 d = dp + (x+j) * dstep;
411 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
414 // if the main channel has an alpha channel, alpha has to be calculated
415 // to create an un-premultiplied (straight) alpha value
416 if (main_has_alpha && alpha != 0 && alpha != 255) {
417 uint8_t alpha_d = d[da];
418 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
430 // main_value = main_value * (1 - alpha) + overlay_value * alpha
431 // since alpha is in the range 0-255, the result must divided by 255
432 d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + s[sr] * alpha);
433 d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + s[sg] * alpha);
434 d[db] = FAST_DIV255(d[db] * (255 - alpha) + s[sb] * alpha);
436 if (main_has_alpha) {
444 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
445 d[da] += FAST_DIV255((255 - d[da]) * s[sa]);
451 dp += dst->linesize[0];
452 sp += src->linesize[0];
455 const int main_has_alpha = over->main_has_alpha;
456 if (main_has_alpha) {
457 uint8_t alpha; ///< the amount of overlay to blend on to main
458 uint8_t *s, *sa, *d, *da;
461 sa = src->data[3] + i * src->linesize[3];
462 da = dst->data[3] + (y+i) * dst->linesize[3];
464 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
469 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
471 if (alpha != 0 && alpha != 255) {
472 uint8_t alpha_d = *d;
473 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
482 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
483 *d += FAST_DIV255((255 - *d) * *s);
488 da += dst->linesize[3];
489 sa += src->linesize[3];
492 for (i = 0; i < 3; i++) {
493 int hsub = i ? over->hsub : 0;
494 int vsub = i ? over->vsub : 0;
495 int src_wp = FFALIGN(src_w, 1<<hsub) >> hsub;
496 int src_hp = FFALIGN(src_h, 1<<vsub) >> vsub;
497 int dst_wp = FFALIGN(dst_w, 1<<hsub) >> hsub;
498 int dst_hp = FFALIGN(dst_h, 1<<vsub) >> vsub;
501 uint8_t *s, *sp, *d, *dp, *a, *ap;
504 sp = src->data[i] + j * src->linesize[i];
505 dp = dst->data[i] + (yp+j) * dst->linesize[i];
506 ap = src->data[3] + (j<<vsub) * src->linesize[3];
508 for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
514 for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
515 int alpha_v, alpha_h, alpha;
517 // average alpha for color components, improve quality
518 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
519 alpha = (a[0] + a[src->linesize[3]] +
520 a[1] + a[src->linesize[3]+1]) >> 2;
521 } else if (hsub || vsub) {
522 alpha_h = hsub && k+1 < src_wp ?
523 (a[0] + a[1]) >> 1 : a[0];
524 alpha_v = vsub && j+1 < src_hp ?
525 (a[0] + a[src->linesize[3]]) >> 1 : a[0];
526 alpha = (alpha_v + alpha_h) >> 1;
529 // if the main channel has an alpha channel, alpha has to be calculated
530 // to create an un-premultiplied (straight) alpha value
531 if (main_has_alpha && alpha != 0 && alpha != 255) {
532 // average alpha for color components, improve quality
534 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
535 alpha_d = (d[0] + d[src->linesize[3]] +
536 d[1] + d[src->linesize[3]+1]) >> 2;
537 } else if (hsub || vsub) {
538 alpha_h = hsub && k+1 < src_wp ?
539 (d[0] + d[1]) >> 1 : d[0];
540 alpha_v = vsub && j+1 < src_hp ?
541 (d[0] + d[src->linesize[3]]) >> 1 : d[0];
542 alpha_d = (alpha_v + alpha_h) >> 1;
545 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
547 *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
552 dp += dst->linesize[i];
553 sp += src->linesize[i];
554 ap += (1 << vsub) * src->linesize[3];
560 static int try_filter_frame(AVFilterContext *ctx, AVFrame *mainpic)
562 OverlayContext *over = ctx->priv;
563 AVFilterLink *inlink = ctx->inputs[0];
564 AVFrame *next_overpic;
567 /* Discard obsolete overlay frames: if there is a next overlay frame with pts
568 * before the main frame, we can drop the current overlay. */
570 next_overpic = ff_bufqueue_peek(&over->queue_over, 0);
571 if (!next_overpic && over->overlay_eof && !over->repeatlast) {
572 av_frame_free(&over->overpicref);
575 if (!next_overpic || av_compare_ts(next_overpic->pts, ctx->inputs[OVERLAY]->time_base,
576 mainpic->pts , ctx->inputs[MAIN]->time_base) > 0)
578 ff_bufqueue_get(&over->queue_over);
579 av_frame_free(&over->overpicref);
580 over->overpicref = next_overpic;
583 /* If there is no next frame and no EOF and the overlay frame is before
584 * the main frame, we can not know yet if it will be superseded. */
585 if (!over->queue_over.available && !over->overlay_eof &&
586 (!over->overpicref || av_compare_ts(over->overpicref->pts, ctx->inputs[OVERLAY]->time_base,
587 mainpic->pts , ctx->inputs[MAIN]->time_base) < 0))
588 return AVERROR(EAGAIN);
590 /* At this point, we know that the current overlay frame extends to the
591 * time of the main frame. */
592 av_dlog(ctx, "main_pts:%s main_pts_time:%s",
593 av_ts2str(mainpic->pts), av_ts2timestr(mainpic->pts, &ctx->inputs[MAIN]->time_base));
594 if (over->overpicref)
595 av_dlog(ctx, " over_pts:%s over_pts_time:%s",
596 av_ts2str(over->overpicref->pts), av_ts2timestr(over->overpicref->pts, &ctx->inputs[OVERLAY]->time_base));
599 if (over->overpicref) {
600 if (over->eval_mode == EVAL_MODE_FRAME) {
601 int64_t pos = av_frame_get_pkt_pos(mainpic);
603 over->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
604 NAN : mainpic->pts * av_q2d(inlink->time_base);
605 over->var_values[VAR_POS] = pos == -1 ? NAN : pos;
607 eval_expr(ctx, EVAL_ALL);
608 av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d enable:%f\n",
609 over->var_values[VAR_N], over->var_values[VAR_T], over->var_values[VAR_POS],
610 over->var_values[VAR_X], over->x,
611 over->var_values[VAR_Y], over->y,
615 blend_image(ctx, mainpic, over->overpicref, over->x, over->y);
617 over->var_values[VAR_N] += 1.0;
619 ret = ff_filter_frame(ctx->outputs[0], mainpic);
620 av_assert1(ret != AVERROR(EAGAIN));
621 over->frame_requested = 0;
625 static int try_filter_next_frame(AVFilterContext *ctx)
627 OverlayContext *over = ctx->priv;
628 AVFrame *next_mainpic = ff_bufqueue_peek(&over->queue_main, 0);
632 return AVERROR(EAGAIN);
633 if ((ret = try_filter_frame(ctx, next_mainpic)) == AVERROR(EAGAIN))
635 ff_bufqueue_get(&over->queue_main);
639 static int flush_frames(AVFilterContext *ctx)
643 while (!(ret = try_filter_next_frame(ctx)));
644 return ret == AVERROR(EAGAIN) ? 0 : ret;
647 static int filter_frame_main(AVFilterLink *inlink, AVFrame *inpicref)
649 AVFilterContext *ctx = inlink->dst;
650 OverlayContext *over = ctx->priv;
653 if ((ret = flush_frames(ctx)) < 0)
655 if ((ret = try_filter_frame(ctx, inpicref)) < 0) {
656 if (ret != AVERROR(EAGAIN))
658 ff_bufqueue_add(ctx, &over->queue_main, inpicref);
661 if (!over->overpicref)
668 static int filter_frame_over(AVFilterLink *inlink, AVFrame *inpicref)
670 AVFilterContext *ctx = inlink->dst;
671 OverlayContext *over = ctx->priv;
674 if ((ret = flush_frames(ctx)) < 0)
676 ff_bufqueue_add(ctx, &over->queue_over, inpicref);
677 ret = try_filter_next_frame(ctx);
678 return ret == AVERROR(EAGAIN) ? 0 : ret;
681 static int request_frame(AVFilterLink *outlink)
683 AVFilterContext *ctx = outlink->src;
684 OverlayContext *over = ctx->priv;
687 if (!try_filter_next_frame(ctx))
689 over->frame_requested = 1;
690 while (over->frame_requested) {
691 /* TODO if we had a frame duration, we could guess more accurately */
692 input = !over->overlay_eof && (over->queue_main.available ||
693 over->queue_over.available < 2) ?
695 ret = ff_request_frame(ctx->inputs[input]);
696 /* EOF on main is reported immediately */
697 if (ret == AVERROR_EOF && input == OVERLAY) {
698 over->overlay_eof = 1;
701 if ((ret = try_filter_next_frame(ctx)) != AVERROR(EAGAIN))
703 ret = 0; /* continue requesting frames on main */
711 #define OFFSET(x) offsetof(OverlayContext, x)
712 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
714 static const AVOption overlay_options[] = {
715 { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
716 { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
717 { "enable", "set expression which enables overlay", OFFSET(enable_expr), AV_OPT_TYPE_STRING, {.str = "1"}, .flags = FLAGS },
718 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
719 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
720 { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
721 { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
722 { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
723 { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
724 { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
725 { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
726 { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
727 { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
731 AVFILTER_DEFINE_CLASS(overlay);
733 static const AVFilterPad avfilter_vf_overlay_inputs[] = {
736 .type = AVMEDIA_TYPE_VIDEO,
737 .get_video_buffer = ff_null_get_video_buffer,
738 .config_props = config_input_main,
739 .filter_frame = filter_frame_main,
744 .type = AVMEDIA_TYPE_VIDEO,
745 .config_props = config_input_overlay,
746 .filter_frame = filter_frame_over,
751 static const AVFilterPad avfilter_vf_overlay_outputs[] = {
754 .type = AVMEDIA_TYPE_VIDEO,
755 .config_props = config_output,
756 .request_frame = request_frame,
761 AVFilter avfilter_vf_overlay = {
763 .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
768 .priv_size = sizeof(OverlayContext),
769 .priv_class = &overlay_class,
771 .query_formats = query_formats,
772 .process_command = process_command,
774 .inputs = avfilter_vf_overlay_inputs,
775 .outputs = avfilter_vf_overlay_outputs,