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 43static 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 58enum var_name { 59 VAR_MAIN_W, VAR_MW, 60 VAR_MAIN_H, VAR_MH, 61 VAR_OVERLAY_W, VAR_OW, 62 VAR_OVERLAY_H, VAR_OH, 63 VAR_HSUB, 64 VAR_VSUB, 65 VAR_X, 66 VAR_Y, 67 VAR_N, 68 VAR_POS, 69 VAR_T, 70 VAR_VARS_NB 71}; 72 73enum EOFAction { 74 EOF_ACTION_REPEAT, 75 EOF_ACTION_ENDALL, 76 EOF_ACTION_PASS 77}; 78 79static const char *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 95typedef struct OverlayContext { 96 const AVClass *class; 97 int x, y; ///< position of overlayed picture 98 99 int allow_packed_rgb; 100 uint8_t main_is_packed_rgb; 101 uint8_t main_rgba_map[4]; 102 uint8_t main_has_alpha; 103 uint8_t overlay_is_packed_rgb; 104 uint8_t overlay_rgba_map[4]; 105 uint8_t overlay_has_alpha; 106 enum OverlayFormat { OVERLAY_FORMAT_YUV420, OVERLAY_FORMAT_YUV422, OVERLAY_FORMAT_YUV444, OVERLAY_FORMAT_RGB, OVERLAY_FORMAT_NB} format; 107 enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode; 108 109 FFDualInputContext dinput; 110 111 int main_pix_step[4]; ///< steps per pixel for each plane of the main output 112 int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay 113 int hsub, vsub; ///< chroma subsampling values 114 115 double var_values[VAR_VARS_NB]; 116 char *x_expr, *y_expr; 117 118 enum EOFAction eof_action; ///< action to take on EOF from source 119 120 AVExpr *x_pexpr, *y_pexpr; 121} OverlayContext; 122 123static av_cold void uninit(AVFilterContext *ctx) 124{ 125 OverlayContext *s = ctx->priv; 126 127 ff_dualinput_uninit(&s->dinput); 128 av_expr_free(s->x_pexpr); s->x_pexpr = NULL; 129 av_expr_free(s->y_pexpr); s->y_pexpr = NULL; 130} 131 132static inline int normalize_xy(double d, int chroma_sub) 133{ 134 if (isnan(d)) 135 return INT_MAX; 136 return (int)d & ~((1 << chroma_sub) - 1); 137} 138 139static void eval_expr(AVFilterContext *ctx) 140{ 141 OverlayContext *s = ctx->priv; 142 143 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL); 144 s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL); 145 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL); 146 s->x = normalize_xy(s->var_values[VAR_X], s->hsub); 147 s->y = normalize_xy(s->var_values[VAR_Y], s->vsub); 148} 149 150static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx) 151{ 152 int ret; 153 AVExpr *old = NULL; 154 155 if (*pexpr) 156 old = *pexpr; 157 ret = av_expr_parse(pexpr, expr, var_names, 158 NULL, NULL, NULL, NULL, 0, log_ctx); 159 if (ret < 0) { 160 av_log(log_ctx, AV_LOG_ERROR, 161 "Error when evaluating the expression '%s' for %s\n", 162 expr, option); 163 *pexpr = old; 164 return ret; 165 } 166 167 av_expr_free(old); 168 return 0; 169} 170 171static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, 172 char *res, int res_len, int flags) 173{ 174 OverlayContext *s = ctx->priv; 175 int ret; 176 177 if (!strcmp(cmd, "x")) 178 ret = set_expr(&s->x_pexpr, args, cmd, ctx); 179 else if (!strcmp(cmd, "y")) 180 ret = set_expr(&s->y_pexpr, args, cmd, ctx); 181 else 182 ret = AVERROR(ENOSYS); 183 184 if (ret < 0) 185 return ret; 186 187 if (s->eval_mode == EVAL_MODE_INIT) { 188 eval_expr(ctx); 189 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n", 190 s->var_values[VAR_X], s->x, 191 s->var_values[VAR_Y], s->y); 192 } 193 return ret; 194} 195 196static int query_formats(AVFilterContext *ctx) 197{ 198 OverlayContext *s = ctx->priv; 199 200 /* overlay formats contains alpha, for avoiding conversion with alpha information loss */ 201 static const enum AVPixelFormat main_pix_fmts_yuv420[] = { 202 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE 203 }; 204 static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = { 205 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE 206 }; 207 208 static const enum AVPixelFormat main_pix_fmts_yuv422[] = { 209 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE 210 }; 211 static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = { 212 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE 213 }; 214 215 static const enum AVPixelFormat main_pix_fmts_yuv444[] = { 216 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE 217 }; 218 static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = { 219 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE 220 }; 221 222 static const enum AVPixelFormat main_pix_fmts_rgb[] = { 223 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, 224 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, 225 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, 226 AV_PIX_FMT_NONE 227 }; 228 static const enum AVPixelFormat overlay_pix_fmts_rgb[] = { 229 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, 230 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, 231 AV_PIX_FMT_NONE 232 }; 233 234 AVFilterFormats *main_formats; 235 AVFilterFormats *overlay_formats; 236 237 switch (s->format) { 238 case OVERLAY_FORMAT_YUV420: 239 main_formats = ff_make_format_list(main_pix_fmts_yuv420); 240 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420); 241 break; 242 case OVERLAY_FORMAT_YUV422: 243 main_formats = ff_make_format_list(main_pix_fmts_yuv422); 244 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422); 245 break; 246 case OVERLAY_FORMAT_YUV444: 247 main_formats = ff_make_format_list(main_pix_fmts_yuv444); 248 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444); 249 break; 250 case OVERLAY_FORMAT_RGB: 251 main_formats = ff_make_format_list(main_pix_fmts_rgb); 252 overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb); 253 break; 254 default: 255 av_assert0(0); 256 } 257 258 ff_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats); 259 ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats); 260 ff_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats ); 261 262 return 0; 263} 264 265static const enum AVPixelFormat alpha_pix_fmts[] = { 266 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA444P, 267 AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA, 268 AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE 269}; 270 271static int config_input_main(AVFilterLink *inlink) 272{ 273 OverlayContext *s = inlink->dst->priv; 274 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format); 275 276 av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc); 277 278 s->hsub = pix_desc->log2_chroma_w; 279 s->vsub = pix_desc->log2_chroma_h; 280 281 s->main_is_packed_rgb = 282 ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0; 283 s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts); 284 return 0; 285} 286 287static int config_input_overlay(AVFilterLink *inlink) 288{ 289 AVFilterContext *ctx = inlink->dst; 290 OverlayContext *s = inlink->dst->priv; 291 int ret; 292 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format); 293 294 av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc); 295 296 /* Finish the configuration by evaluating the expressions 297 now when both inputs are configured. */ 298 s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w; 299 s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h; 300 s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w; 301 s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h; 302 s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w; 303 s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h; 304 s->var_values[VAR_X] = NAN; 305 s->var_values[VAR_Y] = NAN; 306 s->var_values[VAR_N] = 0; 307 s->var_values[VAR_T] = NAN; 308 s->var_values[VAR_POS] = NAN; 309 310 if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 || 311 (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0) 312 return ret; 313 314 s->overlay_is_packed_rgb = 315 ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0; 316 s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts); 317 318 if (s->eval_mode == EVAL_MODE_INIT) { 319 eval_expr(ctx); 320 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n", 321 s->var_values[VAR_X], s->x, 322 s->var_values[VAR_Y], s->y); 323 } 324 325 av_log(ctx, AV_LOG_VERBOSE, 326 "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s eof_action:%s\n", 327 ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h, 328 av_get_pix_fmt_name(ctx->inputs[MAIN]->format), 329 ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h, 330 av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format), 331 eof_action_str[s->eof_action]); 332 return 0; 333} 334 335static int config_output(AVFilterLink *outlink) 336{ 337 AVFilterContext *ctx = outlink->src; 338 OverlayContext *s = ctx->priv; 339 int ret; 340 341 if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0) 342 return ret; 343 344 outlink->w = ctx->inputs[MAIN]->w; 345 outlink->h = ctx->inputs[MAIN]->h; 346 outlink->time_base = ctx->inputs[MAIN]->time_base; 347 348 return 0; 349} 350 351// divide by 255 and round to nearest 352// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16 353#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16) 354 355// calculate the unpremultiplied alpha, applying the general equation: 356// alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) ) 357// (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x 358// ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y) 359#define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x))) 360 361/** 362 * Blend image in src to destination buffer dst at position (x, y). 363 */ 364static void blend_image(AVFilterContext *ctx, 365 AVFrame *dst, const AVFrame *src, 366 int x, int y) 367{ 368 OverlayContext *s = ctx->priv; 369 int i, imax, j, jmax, k, kmax; 370 const int src_w = src->width; 371 const int src_h = src->height; 372 const int dst_w = dst->width; 373 const int dst_h = dst->height; 374 375 if (x >= dst_w || x+src_w < 0 || 376 y >= dst_h || y+src_h < 0) 377 return; /* no intersection */ 378 379 if (s->main_is_packed_rgb) { 380 uint8_t alpha; ///< the amount of overlay to blend on to main 381 const int dr = s->main_rgba_map[R]; 382 const int dg = s->main_rgba_map[G]; 383 const int db = s->main_rgba_map[B]; 384 const int da = s->main_rgba_map[A]; 385 const int dstep = s->main_pix_step[0]; 386 const int sr = s->overlay_rgba_map[R]; 387 const int sg = s->overlay_rgba_map[G]; 388 const int sb = s->overlay_rgba_map[B]; 389 const int sa = s->overlay_rgba_map[A]; 390 const int sstep = s->overlay_pix_step[0]; 391 const int main_has_alpha = s->main_has_alpha; 392 uint8_t *s, *sp, *d, *dp; 393 394 i = FFMAX(-y, 0); 395 sp = src->data[0] + i * src->linesize[0]; 396 dp = dst->data[0] + (y+i) * dst->linesize[0]; 397 398 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) { 399 j = FFMAX(-x, 0); 400 s = sp + j * sstep; 401 d = dp + (x+j) * dstep; 402 403 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) { 404 alpha = s[sa]; 405 406 // if the main channel has an alpha channel, alpha has to be calculated 407 // to create an un-premultiplied (straight) alpha value 408 if (main_has_alpha && alpha != 0 && alpha != 255) { 409 uint8_t alpha_d = d[da]; 410 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); 411 } 412 413 switch (alpha) { 414 case 0: 415 break; 416 case 255: 417 d[dr] = s[sr]; 418 d[dg] = s[sg]; 419 d[db] = s[sb]; 420 break; 421 default: 422 // main_value = main_value * (1 - alpha) + overlay_value * alpha 423 // since alpha is in the range 0-255, the result must divided by 255 424 d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + s[sr] * alpha); 425 d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + s[sg] * alpha); 426 d[db] = FAST_DIV255(d[db] * (255 - alpha) + s[sb] * alpha); 427 } 428 if (main_has_alpha) { 429 switch (alpha) { 430 case 0: 431 break; 432 case 255: 433 d[da] = s[sa]; 434 break; 435 default: 436 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha 437 d[da] += FAST_DIV255((255 - d[da]) * s[sa]); 438 } 439 } 440 d += dstep; 441 s += sstep; 442 } 443 dp += dst->linesize[0]; 444 sp += src->linesize[0]; 445 } 446 } else { 447 const int main_has_alpha = s->main_has_alpha; 448 if (main_has_alpha) { 449 uint8_t alpha; ///< the amount of overlay to blend on to main 450 uint8_t *s, *sa, *d, *da; 451 452 i = FFMAX(-y, 0); 453 sa = src->data[3] + i * src->linesize[3]; 454 da = dst->data[3] + (y+i) * dst->linesize[3]; 455 456 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) { 457 j = FFMAX(-x, 0); 458 s = sa + j; 459 d = da + x+j; 460 461 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) { 462 alpha = *s; 463 if (alpha != 0 && alpha != 255) { 464 uint8_t alpha_d = *d; 465 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); 466 } 467 switch (alpha) { 468 case 0: 469 break; 470 case 255: 471 *d = *s; 472 break; 473 default: 474 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha 475 *d += FAST_DIV255((255 - *d) * *s); 476 } 477 d += 1; 478 s += 1; 479 } 480 da += dst->linesize[3]; 481 sa += src->linesize[3]; 482 } 483 } 484 for (i = 0; i < 3; i++) { 485 int hsub = i ? s->hsub : 0; 486 int vsub = i ? s->vsub : 0; 487 int src_wp = FF_CEIL_RSHIFT(src_w, hsub); 488 int src_hp = FF_CEIL_RSHIFT(src_h, vsub); 489 int dst_wp = FF_CEIL_RSHIFT(dst_w, hsub); 490 int dst_hp = FF_CEIL_RSHIFT(dst_h, vsub); 491 int yp = y>>vsub; 492 int xp = x>>hsub; 493 uint8_t *s, *sp, *d, *dp, *a, *ap; 494 495 j = FFMAX(-yp, 0); 496 sp = src->data[i] + j * src->linesize[i]; 497 dp = dst->data[i] + (yp+j) * dst->linesize[i]; 498 ap = src->data[3] + (j<<vsub) * src->linesize[3]; 499 500 for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) { 501 k = FFMAX(-xp, 0); 502 d = dp + xp+k; 503 s = sp + k; 504 a = ap + (k<<hsub); 505 506 for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) { 507 int alpha_v, alpha_h, alpha; 508 509 // average alpha for color components, improve quality 510 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) { 511 alpha = (a[0] + a[src->linesize[3]] + 512 a[1] + a[src->linesize[3]+1]) >> 2; 513 } else if (hsub || vsub) { 514 alpha_h = hsub && k+1 < src_wp ? 515 (a[0] + a[1]) >> 1 : a[0]; 516 alpha_v = vsub && j+1 < src_hp ? 517 (a[0] + a[src->linesize[3]]) >> 1 : a[0]; 518 alpha = (alpha_v + alpha_h) >> 1; 519 } else 520 alpha = a[0]; 521 // if the main channel has an alpha channel, alpha has to be calculated 522 // to create an un-premultiplied (straight) alpha value 523 if (main_has_alpha && alpha != 0 && alpha != 255) { 524 // average alpha for color components, improve quality 525 uint8_t alpha_d; 526 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) { 527 alpha_d = (d[0] + d[src->linesize[3]] + 528 d[1] + d[src->linesize[3]+1]) >> 2; 529 } else if (hsub || vsub) { 530 alpha_h = hsub && k+1 < src_wp ? 531 (d[0] + d[1]) >> 1 : d[0]; 532 alpha_v = vsub && j+1 < src_hp ? 533 (d[0] + d[src->linesize[3]]) >> 1 : d[0]; 534 alpha_d = (alpha_v + alpha_h) >> 1; 535 } else 536 alpha_d = d[0]; 537 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d); 538 } 539 *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha); 540 s++; 541 d++; 542 a += 1 << hsub; 543 } 544 dp += dst->linesize[i]; 545 sp += src->linesize[i]; 546 ap += (1 << vsub) * src->linesize[3]; 547 } 548 } 549 } 550} 551 552static AVFrame *do_blend(AVFilterContext *ctx, AVFrame *mainpic, 553 const AVFrame *second) 554{ 555 OverlayContext *s = ctx->priv; 556 AVFilterLink *inlink = ctx->inputs[0]; 557 558 if (s->eval_mode == EVAL_MODE_FRAME) { 559 int64_t pos = av_frame_get_pkt_pos(mainpic); 560 561 s->var_values[VAR_N] = inlink->frame_count; 562 s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ? 563 NAN : mainpic->pts * av_q2d(inlink->time_base); 564 s->var_values[VAR_POS] = pos == -1 ? NAN : pos; 565 566 eval_expr(ctx); 567 av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n", 568 s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS], 569 s->var_values[VAR_X], s->x, 570 s->var_values[VAR_Y], s->y); 571 } 572 573 blend_image(ctx, mainpic, second, s->x, s->y); 574 return mainpic; 575} 576 577static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) 578{ 579 OverlayContext *s = inlink->dst->priv; 580 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)); 581 return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref); 582} 583 584static int request_frame(AVFilterLink *outlink) 585{ 586 OverlayContext *s = outlink->src->priv; 587 return ff_dualinput_request_frame(&s->dinput, outlink); 588} 589 590static av_cold int init(AVFilterContext *ctx) 591{ 592 OverlayContext *s = ctx->priv; 593 594 if (s->allow_packed_rgb) { 595 av_log(ctx, AV_LOG_WARNING, 596 "The rgb option is deprecated and is overriding the format option, use format instead\n"); 597 s->format = OVERLAY_FORMAT_RGB; 598 } 599 if (!s->dinput.repeatlast || s->eof_action == EOF_ACTION_PASS) { 600 s->dinput.repeatlast = 0; 601 s->eof_action = EOF_ACTION_PASS; 602 } 603 if (s->dinput.shortest || s->eof_action == EOF_ACTION_ENDALL) { 604 s->dinput.shortest = 1; 605 s->eof_action = EOF_ACTION_ENDALL; 606 } 607 608 s->dinput.process = do_blend; 609 return 0; 610} 611 612#define OFFSET(x) offsetof(OverlayContext, x) 613#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 614 615static const AVOption overlay_options[] = { 616 { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS }, 617 { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS }, 618 { "eof_action", "Action to take when encountering EOF from secondary input ", 619 OFFSET(eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT }, 620 EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" }, 621 { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" }, 622 { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" }, 623 { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" }, 624 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" }, 625 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" }, 626 { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" }, 627 { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, 628 { "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS }, 629 { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" }, 630 { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" }, 631 { "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" }, 632 { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" }, 633 { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" }, 634 { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS }, 635 { NULL } 636}; 637 638AVFILTER_DEFINE_CLASS(overlay); 639 640static const AVFilterPad avfilter_vf_overlay_inputs[] = { 641 { 642 .name = "main", 643 .type = AVMEDIA_TYPE_VIDEO, 644 .config_props = config_input_main, 645 .filter_frame = filter_frame, 646 .needs_writable = 1, 647 }, 648 { 649 .name = "overlay", 650 .type = AVMEDIA_TYPE_VIDEO, 651 .config_props = config_input_overlay, 652 .filter_frame = filter_frame, 653 }, 654 { NULL } 655}; 656 657static const AVFilterPad avfilter_vf_overlay_outputs[] = { 658 { 659 .name = "default", 660 .type = AVMEDIA_TYPE_VIDEO, 661 .config_props = config_output, 662 .request_frame = request_frame, 663 }, 664 { NULL } 665}; 666 667AVFilter ff_vf_overlay = { 668 .name = "overlay", 669 .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."), 670 .init = init, 671 .uninit = uninit, 672 .priv_size = sizeof(OverlayContext), 673 .priv_class = &overlay_class, 674 .query_formats = query_formats, 675 .process_command = process_command, 676 .inputs = avfilter_vf_overlay_inputs, 677 .outputs = avfilter_vf_overlay_outputs, 678 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, 679}; 680