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
128 const AVPixFmtDescriptor *main_desc; ///< format descriptor for main input
130 double var_values[VAR_VARS_NB];
131 char *x_expr, *y_expr;
133 int eof_action; ///< action to take on EOF from source
135 AVExpr *x_pexpr, *y_pexpr;
137 void (*blend_image)(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y);
140 static av_cold void uninit(AVFilterContext *ctx)
142 OverlayContext *s = ctx->priv;
144 ff_dualinput_uninit(&s->dinput);
145 av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
146 av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
149 static inline int normalize_xy(double d, int chroma_sub)
153 return (int)d & ~((1 << chroma_sub) - 1);
156 static void eval_expr(AVFilterContext *ctx)
158 OverlayContext *s = ctx->priv;
160 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
161 s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
162 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
163 s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
164 s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
167 static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
174 ret = av_expr_parse(pexpr, expr, var_names,
175 NULL, NULL, NULL, NULL, 0, log_ctx);
177 av_log(log_ctx, AV_LOG_ERROR,
178 "Error when evaluating the expression '%s' for %s\n",
188 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
189 char *res, int res_len, int flags)
191 OverlayContext *s = ctx->priv;
194 if (!strcmp(cmd, "x"))
195 ret = set_expr(&s->x_pexpr, args, cmd, ctx);
196 else if (!strcmp(cmd, "y"))
197 ret = set_expr(&s->y_pexpr, args, cmd, ctx);
199 ret = AVERROR(ENOSYS);
204 if (s->eval_mode == EVAL_MODE_INIT) {
206 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
207 s->var_values[VAR_X], s->x,
208 s->var_values[VAR_Y], s->y);
213 static int query_formats(AVFilterContext *ctx)
215 OverlayContext *s = ctx->priv;
217 /* overlay formats contains alpha, for avoiding conversion with alpha information loss */
218 static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
219 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVA420P,
220 AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
223 static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
224 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
227 static const enum AVPixelFormat main_pix_fmts_yuv422[] = {
228 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
230 static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = {
231 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
234 static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
235 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
237 static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
238 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
241 static const enum AVPixelFormat main_pix_fmts_rgb[] = {
242 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
243 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
244 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
247 static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
248 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
249 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
253 AVFilterFormats *main_formats = NULL;
254 AVFilterFormats *overlay_formats = NULL;
258 case OVERLAY_FORMAT_YUV420:
259 if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv420)) ||
260 !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420))) {
261 ret = AVERROR(ENOMEM);
265 case OVERLAY_FORMAT_YUV422:
266 if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv422)) ||
267 !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422))) {
268 ret = AVERROR(ENOMEM);
272 case OVERLAY_FORMAT_YUV444:
273 if (!(main_formats = ff_make_format_list(main_pix_fmts_yuv444)) ||
274 !(overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444))) {
275 ret = AVERROR(ENOMEM);
279 case OVERLAY_FORMAT_RGB:
280 if (!(main_formats = ff_make_format_list(main_pix_fmts_rgb)) ||
281 !(overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb))) {
282 ret = AVERROR(ENOMEM);
290 if ((ret = ff_formats_ref(main_formats , &ctx->inputs[MAIN]->out_formats )) < 0 ||
291 (ret = ff_formats_ref(overlay_formats, &ctx->inputs[OVERLAY]->out_formats)) < 0 ||
292 (ret = ff_formats_ref(main_formats , &ctx->outputs[MAIN]->in_formats )) < 0)
298 av_freep(&main_formats->formats);
299 av_freep(&main_formats);
301 av_freep(&overlay_formats->formats);
302 av_freep(&overlay_formats);
306 static const enum AVPixelFormat alpha_pix_fmts[] = {
307 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
308 AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,
309 AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE
312 static int config_input_overlay(AVFilterLink *inlink)
314 AVFilterContext *ctx = inlink->dst;
315 OverlayContext *s = inlink->dst->priv;
317 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
319 av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc);
321 /* Finish the configuration by evaluating the expressions
322 now when both inputs are configured. */
323 s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
324 s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
325 s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
326 s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
327 s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
328 s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
329 s->var_values[VAR_X] = NAN;
330 s->var_values[VAR_Y] = NAN;
331 s->var_values[VAR_N] = 0;
332 s->var_values[VAR_T] = NAN;
333 s->var_values[VAR_POS] = NAN;
335 if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
336 (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
339 s->overlay_is_packed_rgb =
340 ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
341 s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
343 if (s->eval_mode == EVAL_MODE_INIT) {
345 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
346 s->var_values[VAR_X], s->x,
347 s->var_values[VAR_Y], s->y);
350 av_log(ctx, AV_LOG_VERBOSE,
351 "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s eof_action:%s\n",
352 ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
353 av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
354 ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
355 av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format),
356 eof_action_str[s->eof_action]);
360 static int config_output(AVFilterLink *outlink)
362 AVFilterContext *ctx = outlink->src;
363 OverlayContext *s = ctx->priv;
366 if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
369 outlink->w = ctx->inputs[MAIN]->w;
370 outlink->h = ctx->inputs[MAIN]->h;
371 outlink->time_base = ctx->inputs[MAIN]->time_base;
376 // divide by 255 and round to nearest
377 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
378 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
380 // calculate the unpremultiplied alpha, applying the general equation:
381 // alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
382 // (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
383 // ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
384 #define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
387 * Blend image in src to destination buffer dst at position (x, y).
390 static void blend_image_packed_rgb(AVFilterContext *ctx,
391 AVFrame *dst, const AVFrame *src,
394 OverlayContext *s = ctx->priv;
395 int i, imax, j, jmax;
396 const int src_w = src->width;
397 const int src_h = src->height;
398 const int dst_w = dst->width;
399 const int dst_h = dst->height;
400 uint8_t alpha; ///< the amount of overlay to blend on to main
401 const int dr = s->main_rgba_map[R];
402 const int dg = s->main_rgba_map[G];
403 const int db = s->main_rgba_map[B];
404 const int da = s->main_rgba_map[A];
405 const int dstep = s->main_pix_step[0];
406 const int sr = s->overlay_rgba_map[R];
407 const int sg = s->overlay_rgba_map[G];
408 const int sb = s->overlay_rgba_map[B];
409 const int sa = s->overlay_rgba_map[A];
410 const int sstep = s->overlay_pix_step[0];
411 const int main_has_alpha = s->main_has_alpha;
412 uint8_t *S, *sp, *d, *dp;
415 sp = src->data[0] + i * src->linesize[0];
416 dp = dst->data[0] + (y+i) * dst->linesize[0];
418 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
421 d = dp + (x+j) * dstep;
423 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
426 // if the main channel has an alpha channel, alpha has to be calculated
427 // to create an un-premultiplied (straight) alpha value
428 if (main_has_alpha && alpha != 0 && alpha != 255) {
429 uint8_t alpha_d = d[da];
430 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
442 // main_value = main_value * (1 - alpha) + overlay_value * alpha
443 // since alpha is in the range 0-255, the result must divided by 255
444 d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + S[sr] * alpha);
445 d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + S[sg] * alpha);
446 d[db] = FAST_DIV255(d[db] * (255 - alpha) + S[sb] * alpha);
448 if (main_has_alpha) {
456 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
457 d[da] += FAST_DIV255((255 - d[da]) * S[sa]);
463 dp += dst->linesize[0];
464 sp += src->linesize[0];
468 static av_always_inline void blend_plane(AVFilterContext *ctx,
469 AVFrame *dst, const AVFrame *src,
470 int src_w, int src_h,
471 int dst_w, int dst_h,
472 int i, int hsub, int vsub,
476 OverlayContext *ol = ctx->priv;
477 int src_wp = AV_CEIL_RSHIFT(src_w, hsub);
478 int src_hp = AV_CEIL_RSHIFT(src_h, vsub);
479 int dst_wp = AV_CEIL_RSHIFT(dst_w, hsub);
480 int dst_hp = AV_CEIL_RSHIFT(dst_h, vsub);
483 uint8_t *s, *sp, *d, *dp, *a, *ap;
484 int jmax, j, k, kmax;
486 int dst_plane = ol->main_desc->comp[i].plane;
487 int dst_offset = ol->main_desc->comp[i].offset;
488 int dst_step = ol->main_desc->comp[i].step;
491 sp = src->data[i] + j * src->linesize[i];
492 dp = dst->data[dst_plane]
493 + (yp+j) * dst->linesize[dst_plane]
495 ap = src->data[3] + (j<<vsub) * src->linesize[3];
497 for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
499 d = dp + (xp+k) * dst_step;
503 for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
504 int alpha_v, alpha_h, alpha;
506 // average alpha for color components, improve quality
507 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
508 alpha = (a[0] + a[src->linesize[3]] +
509 a[1] + a[src->linesize[3]+1]) >> 2;
510 } else if (hsub || vsub) {
511 alpha_h = hsub && k+1 < src_wp ?
512 (a[0] + a[1]) >> 1 : a[0];
513 alpha_v = vsub && j+1 < src_hp ?
514 (a[0] + a[src->linesize[3]]) >> 1 : a[0];
515 alpha = (alpha_v + alpha_h) >> 1;
518 // if the main channel has an alpha channel, alpha has to be calculated
519 // to create an un-premultiplied (straight) alpha value
520 if (main_has_alpha && alpha != 0 && alpha != 255) {
521 // average alpha for color components, improve quality
523 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
524 alpha_d = (d[0] + d[src->linesize[3]] +
525 d[1] + d[src->linesize[3]+1]) >> 2;
526 } else if (hsub || vsub) {
527 alpha_h = hsub && k+1 < src_wp ?
528 (d[0] + d[1]) >> 1 : d[0];
529 alpha_v = vsub && j+1 < src_hp ?
530 (d[0] + d[src->linesize[3]]) >> 1 : d[0];
531 alpha_d = (alpha_v + alpha_h) >> 1;
534 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
536 *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
541 dp += dst->linesize[dst_plane];
542 sp += src->linesize[i];
543 ap += (1 << vsub) * src->linesize[3];
547 static inline void alpha_composite(const AVFrame *src, const AVFrame *dst,
548 int src_w, int src_h,
549 int dst_w, int dst_h,
552 uint8_t alpha; ///< the amount of overlay to blend on to main
553 uint8_t *s, *sa, *d, *da;
554 int i, imax, j, jmax;
557 sa = src->data[3] + i * src->linesize[3];
558 da = dst->data[3] + (y+i) * dst->linesize[3];
560 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
565 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
567 if (alpha != 0 && alpha != 255) {
568 uint8_t alpha_d = *d;
569 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
578 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
579 *d += FAST_DIV255((255 - *d) * *s);
584 da += dst->linesize[3];
585 sa += src->linesize[3];
589 static av_always_inline void blend_image_yuv(AVFilterContext *ctx,
590 AVFrame *dst, const AVFrame *src,
595 const int src_w = src->width;
596 const int src_h = src->height;
597 const int dst_w = dst->width;
598 const int dst_h = dst->height;
601 alpha_composite(src, dst, src_w, src_h, dst_w, dst_h, x, y);
603 blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 0, 0, 0, x, y, main_has_alpha);
604 blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 1, hsub, vsub, x, y, main_has_alpha);
605 blend_plane(ctx, dst, src, src_w, src_h, dst_w, dst_h, 2, hsub, vsub, x, y, main_has_alpha);
608 static void blend_image_yuv420(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
610 OverlayContext *s = ctx->priv;
612 blend_image_yuv(ctx, dst, src, 1, 1, s->main_has_alpha, x, y);
615 static void blend_image_yuv422(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
617 OverlayContext *s = ctx->priv;
619 blend_image_yuv(ctx, dst, src, 1, 0, s->main_has_alpha, x, y);
622 static void blend_image_yuv444(AVFilterContext *ctx, AVFrame *dst, const AVFrame *src, int x, int y)
624 OverlayContext *s = ctx->priv;
626 blend_image_yuv(ctx, dst, src, 0, 0, s->main_has_alpha, x, y);
629 static int config_input_main(AVFilterLink *inlink)
631 OverlayContext *s = inlink->dst->priv;
632 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
634 av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
636 s->hsub = pix_desc->log2_chroma_w;
637 s->vsub = pix_desc->log2_chroma_h;
639 s->main_desc = pix_desc;
641 s->main_is_packed_rgb =
642 ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
643 s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
645 case OVERLAY_FORMAT_YUV420:
646 s->blend_image = blend_image_yuv420;
648 case OVERLAY_FORMAT_YUV422:
649 s->blend_image = blend_image_yuv422;
651 case OVERLAY_FORMAT_YUV444:
652 s->blend_image = blend_image_yuv444;
654 case OVERLAY_FORMAT_RGB:
655 s->blend_image = blend_image_packed_rgb;
661 static AVFrame *do_blend(AVFilterContext *ctx, AVFrame *mainpic,
662 const AVFrame *second)
664 OverlayContext *s = ctx->priv;
665 AVFilterLink *inlink = ctx->inputs[0];
667 if (s->eval_mode == EVAL_MODE_FRAME) {
668 int64_t pos = av_frame_get_pkt_pos(mainpic);
670 s->var_values[VAR_N] = inlink->frame_count_out;
671 s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
672 NAN : mainpic->pts * av_q2d(inlink->time_base);
673 s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
675 s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = second->width;
676 s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = second->height;
677 s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = mainpic->width;
678 s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = mainpic->height;
681 av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
682 s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
683 s->var_values[VAR_X], s->x,
684 s->var_values[VAR_Y], s->y);
687 if (s->x < mainpic->width && s->x + second->width >= 0 ||
688 s->y < mainpic->height && s->y + second->height >= 0)
689 s->blend_image(ctx, mainpic, second, s->x, s->y);
693 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
695 OverlayContext *s = inlink->dst->priv;
696 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));
697 return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
700 static int request_frame(AVFilterLink *outlink)
702 OverlayContext *s = outlink->src->priv;
703 return ff_dualinput_request_frame(&s->dinput, outlink);
706 static av_cold int init(AVFilterContext *ctx)
708 OverlayContext *s = ctx->priv;
710 if (s->allow_packed_rgb) {
711 av_log(ctx, AV_LOG_WARNING,
712 "The rgb option is deprecated and is overriding the format option, use format instead\n");
713 s->format = OVERLAY_FORMAT_RGB;
715 if (!s->dinput.repeatlast || s->eof_action == EOF_ACTION_PASS) {
716 s->dinput.repeatlast = 0;
717 s->eof_action = EOF_ACTION_PASS;
719 if (s->dinput.shortest || s->eof_action == EOF_ACTION_ENDALL) {
720 s->dinput.shortest = 1;
721 s->eof_action = EOF_ACTION_ENDALL;
724 s->dinput.process = do_blend;
728 #define OFFSET(x) offsetof(OverlayContext, x)
729 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
731 static const AVOption overlay_options[] = {
732 { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
733 { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
734 { "eof_action", "Action to take when encountering EOF from secondary input ",
735 OFFSET(eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
736 EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
737 { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
738 { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
739 { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
740 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
741 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
742 { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
743 { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
744 { "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
745 { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
746 { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
747 { "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" },
748 { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
749 { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
750 { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
754 AVFILTER_DEFINE_CLASS(overlay);
756 static const AVFilterPad avfilter_vf_overlay_inputs[] = {
759 .type = AVMEDIA_TYPE_VIDEO,
760 .config_props = config_input_main,
761 .filter_frame = filter_frame,
766 .type = AVMEDIA_TYPE_VIDEO,
767 .config_props = config_input_overlay,
768 .filter_frame = filter_frame,
773 static const AVFilterPad avfilter_vf_overlay_outputs[] = {
776 .type = AVMEDIA_TYPE_VIDEO,
777 .config_props = config_output,
778 .request_frame = request_frame,
783 AVFilter ff_vf_overlay = {
785 .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
788 .priv_size = sizeof(OverlayContext),
789 .priv_class = &overlay_class,
790 .query_formats = query_formats,
791 .process_command = process_command,
792 .inputs = avfilter_vf_overlay_inputs,
793 .outputs = avfilter_vf_overlay_outputs,
794 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,