1/* 2 * Copyright (c) 2013 Paul B Mahol 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include "libavutil/imgutils.h" 22#include "libavutil/eval.h" 23#include "libavutil/opt.h" 24#include "libavutil/pixfmt.h" 25#include "avfilter.h" 26#include "bufferqueue.h" 27#include "formats.h" 28#include "internal.h" 29#include "dualinput.h" 30#include "video.h" 31 32#define TOP 0 33#define BOTTOM 1 34 35enum BlendMode { 36 BLEND_UNSET = -1, 37 BLEND_NORMAL, 38 BLEND_ADDITION, 39 BLEND_AND, 40 BLEND_AVERAGE, 41 BLEND_BURN, 42 BLEND_DARKEN, 43 BLEND_DIFFERENCE, 44 BLEND_DIVIDE, 45 BLEND_DODGE, 46 BLEND_EXCLUSION, 47 BLEND_HARDLIGHT, 48 BLEND_LIGHTEN, 49 BLEND_MULTIPLY, 50 BLEND_NEGATION, 51 BLEND_OR, 52 BLEND_OVERLAY, 53 BLEND_PHOENIX, 54 BLEND_PINLIGHT, 55 BLEND_REFLECT, 56 BLEND_SCREEN, 57 BLEND_SOFTLIGHT, 58 BLEND_SUBTRACT, 59 BLEND_VIVIDLIGHT, 60 BLEND_XOR, 61 BLEND_NB 62}; 63 64static const char *const var_names[] = { "X", "Y", "W", "H", "SW", "SH", "T", "N", "A", "B", "TOP", "BOTTOM", NULL }; 65enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_SW, VAR_SH, VAR_T, VAR_N, VAR_A, VAR_B, VAR_TOP, VAR_BOTTOM, VAR_VARS_NB }; 66 67typedef struct FilterParams { 68 enum BlendMode mode; 69 double opacity; 70 AVExpr *e; 71 char *expr_str; 72 void (*blend)(const uint8_t *top, int top_linesize, 73 const uint8_t *bottom, int bottom_linesize, 74 uint8_t *dst, int dst_linesize, 75 int width, int start, int end, 76 struct FilterParams *param, double *values); 77} FilterParams; 78 79typedef struct ThreadData { 80 const AVFrame *top, *bottom; 81 AVFrame *dst; 82 AVFilterLink *inlink; 83 int plane; 84 int w, h; 85 FilterParams *param; 86} ThreadData; 87 88typedef struct { 89 const AVClass *class; 90 FFDualInputContext dinput; 91 int hsub, vsub; ///< chroma subsampling values 92 int nb_planes; 93 char *all_expr; 94 enum BlendMode all_mode; 95 double all_opacity; 96 97 FilterParams params[4]; 98} BlendContext; 99 100#define OFFSET(x) offsetof(BlendContext, x) 101#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM 102 103static const AVOption blend_options[] = { 104 { "c0_mode", "set component #0 blend mode", OFFSET(params[0].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"}, 105 { "c1_mode", "set component #1 blend mode", OFFSET(params[1].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"}, 106 { "c2_mode", "set component #2 blend mode", OFFSET(params[2].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"}, 107 { "c3_mode", "set component #3 blend mode", OFFSET(params[3].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"}, 108 { "all_mode", "set blend mode for all components", OFFSET(all_mode), AV_OPT_TYPE_INT, {.i64=-1},-1, BLEND_NB-1, FLAGS, "mode"}, 109 { "addition", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_ADDITION}, 0, 0, FLAGS, "mode" }, 110 { "and", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AND}, 0, 0, FLAGS, "mode" }, 111 { "average", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AVERAGE}, 0, 0, FLAGS, "mode" }, 112 { "burn", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_BURN}, 0, 0, FLAGS, "mode" }, 113 { "darken", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DARKEN}, 0, 0, FLAGS, "mode" }, 114 { "difference", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE}, 0, 0, FLAGS, "mode" }, 115 { "divide", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIVIDE}, 0, 0, FLAGS, "mode" }, 116 { "dodge", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DODGE}, 0, 0, FLAGS, "mode" }, 117 { "exclusion", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXCLUSION}, 0, 0, FLAGS, "mode" }, 118 { "hardlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDLIGHT}, 0, 0, FLAGS, "mode" }, 119 { "lighten", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LIGHTEN}, 0, 0, FLAGS, "mode" }, 120 { "multiply", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY}, 0, 0, FLAGS, "mode" }, 121 { "negation", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NEGATION}, 0, 0, FLAGS, "mode" }, 122 { "normal", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NORMAL}, 0, 0, FLAGS, "mode" }, 123 { "or", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OR}, 0, 0, FLAGS, "mode" }, 124 { "overlay", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OVERLAY}, 0, 0, FLAGS, "mode" }, 125 { "phoenix", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PHOENIX}, 0, 0, FLAGS, "mode" }, 126 { "pinlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PINLIGHT}, 0, 0, FLAGS, "mode" }, 127 { "reflect", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_REFLECT}, 0, 0, FLAGS, "mode" }, 128 { "screen", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SCREEN}, 0, 0, FLAGS, "mode" }, 129 { "softlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTLIGHT}, 0, 0, FLAGS, "mode" }, 130 { "subtract", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SUBTRACT}, 0, 0, FLAGS, "mode" }, 131 { "vividlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_VIVIDLIGHT}, 0, 0, FLAGS, "mode" }, 132 { "xor", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_XOR}, 0, 0, FLAGS, "mode" }, 133 { "c0_expr", "set color component #0 expression", OFFSET(params[0].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, 134 { "c1_expr", "set color component #1 expression", OFFSET(params[1].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, 135 { "c2_expr", "set color component #2 expression", OFFSET(params[2].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, 136 { "c3_expr", "set color component #3 expression", OFFSET(params[3].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, 137 { "all_expr", "set expression for all color components", OFFSET(all_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, 138 { "c0_opacity", "set color component #0 opacity", OFFSET(params[0].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS }, 139 { "c1_opacity", "set color component #1 opacity", OFFSET(params[1].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS }, 140 { "c2_opacity", "set color component #2 opacity", OFFSET(params[2].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS }, 141 { "c3_opacity", "set color component #3 opacity", OFFSET(params[3].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS }, 142 { "all_opacity", "set opacity for all color components", OFFSET(all_opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS}, 143 { "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS }, 144 { "repeatlast", "repeat last bottom frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS }, 145 { NULL } 146}; 147 148AVFILTER_DEFINE_CLASS(blend); 149 150static void blend_normal(const uint8_t *top, int top_linesize, 151 const uint8_t *bottom, int bottom_linesize, 152 uint8_t *dst, int dst_linesize, 153 int width, int start, int end, 154 FilterParams *param, double *values) 155{ 156 av_image_copy_plane(dst, dst_linesize, top, top_linesize, width, end - start); 157} 158 159#define DEFINE_BLEND(name, expr) \ 160static void blend_## name(const uint8_t *top, int top_linesize, \ 161 const uint8_t *bottom, int bottom_linesize, \ 162 uint8_t *dst, int dst_linesize, \ 163 int width, int start, int end, \ 164 FilterParams *param, double *values) \ 165{ \ 166 double opacity = param->opacity; \ 167 int i, j; \ 168 \ 169 for (i = start; i < end; i++) { \ 170 for (j = 0; j < width; j++) { \ 171 dst[j] = top[j] + ((expr) - top[j]) * opacity; \ 172 } \ 173 dst += dst_linesize; \ 174 top += top_linesize; \ 175 bottom += bottom_linesize; \ 176 } \ 177} 178 179#define A top[j] 180#define B bottom[j] 181 182#define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 255)) 183#define SCREEN(x, a, b) (255 - (x) * ((255 - (a)) * (255 - (b)) / 255)) 184#define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a))) 185#define DODGE(a, b) (((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a))))) 186 187DEFINE_BLEND(addition, FFMIN(255, A + B)) 188DEFINE_BLEND(average, (A + B) / 2) 189DEFINE_BLEND(subtract, FFMAX(0, A - B)) 190DEFINE_BLEND(multiply, MULTIPLY(1, A, B)) 191DEFINE_BLEND(negation, 255 - FFABS(255 - A - B)) 192DEFINE_BLEND(difference, FFABS(A - B)) 193DEFINE_BLEND(screen, SCREEN(1, A, B)) 194DEFINE_BLEND(overlay, (A < 128) ? MULTIPLY(2, A, B) : SCREEN(2, A, B)) 195DEFINE_BLEND(hardlight, (B < 128) ? MULTIPLY(2, B, A) : SCREEN(2, B, A)) 196DEFINE_BLEND(darken, FFMIN(A, B)) 197DEFINE_BLEND(lighten, FFMAX(A, B)) 198DEFINE_BLEND(divide, ((float)A / ((float)B) * 255)) 199DEFINE_BLEND(dodge, DODGE(A, B)) 200DEFINE_BLEND(burn, BURN(A, B)) 201DEFINE_BLEND(softlight, (A > 127) ? B + (255 - B) * (A - 127.5) / 127.5 * (0.5 - FFABS(B - 127.5) / 255): B - B * ((127.5 - A) / 127.5) * (0.5 - FFABS(B - 127.5)/255)) 202DEFINE_BLEND(exclusion, A + B - 2 * A * B / 255) 203DEFINE_BLEND(pinlight, (B < 128) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 128))) 204DEFINE_BLEND(phoenix, FFMIN(A, B) - FFMAX(A, B) + 255) 205DEFINE_BLEND(reflect, (B == 255) ? B : FFMIN(255, (A * A / (255 - B)))) 206DEFINE_BLEND(and, A & B) 207DEFINE_BLEND(or, A | B) 208DEFINE_BLEND(xor, A ^ B) 209DEFINE_BLEND(vividlight, (B < 128) ? BURN(A, 2 * B) : DODGE(A, 2 * (B - 128))) 210 211static void blend_expr(const uint8_t *top, int top_linesize, 212 const uint8_t *bottom, int bottom_linesize, 213 uint8_t *dst, int dst_linesize, 214 int width, int start, int end, 215 FilterParams *param, double *values) 216{ 217 AVExpr *e = param->e; 218 int y, x; 219 220 for (y = start; y < end; y++) { 221 values[VAR_Y] = y; 222 for (x = 0; x < width; x++) { 223 values[VAR_X] = x; 224 values[VAR_TOP] = values[VAR_A] = top[x]; 225 values[VAR_BOTTOM] = values[VAR_B] = bottom[x]; 226 dst[x] = av_expr_eval(e, values, NULL); 227 } 228 dst += dst_linesize; 229 top += top_linesize; 230 bottom += bottom_linesize; 231 } 232} 233 234static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) 235{ 236 ThreadData *td = arg; 237 int slice_start = (td->h * jobnr ) / nb_jobs; 238 int slice_end = (td->h * (jobnr+1)) / nb_jobs; 239 const uint8_t *top = td->top->data[td->plane]; 240 const uint8_t *bottom = td->bottom->data[td->plane]; 241 uint8_t *dst = td->dst->data[td->plane]; 242 double values[VAR_VARS_NB]; 243 244 values[VAR_N] = td->inlink->frame_count; 245 values[VAR_T] = td->dst->pts == AV_NOPTS_VALUE ? NAN : td->dst->pts * av_q2d(td->inlink->time_base); 246 values[VAR_W] = td->w; 247 values[VAR_H] = td->h; 248 values[VAR_SW] = td->w / (double)td->dst->width; 249 values[VAR_SH] = td->h / (double)td->dst->height; 250 251 td->param->blend(top + slice_start * td->top->linesize[td->plane], 252 td->top->linesize[td->plane], 253 bottom + slice_start * td->bottom->linesize[td->plane], 254 td->bottom->linesize[td->plane], 255 dst + slice_start * td->dst->linesize[td->plane], 256 td->dst->linesize[td->plane], 257 td->w, slice_start, slice_end, td->param, &values[0]); 258 return 0; 259} 260 261static AVFrame *blend_frame(AVFilterContext *ctx, AVFrame *top_buf, 262 const AVFrame *bottom_buf) 263{ 264 BlendContext *b = ctx->priv; 265 AVFilterLink *inlink = ctx->inputs[0]; 266 AVFilterLink *outlink = ctx->outputs[0]; 267 AVFrame *dst_buf; 268 int plane; 269 270 dst_buf = ff_get_video_buffer(outlink, outlink->w, outlink->h); 271 if (!dst_buf) 272 return top_buf; 273 av_frame_copy_props(dst_buf, top_buf); 274 275 for (plane = 0; plane < b->nb_planes; plane++) { 276 int hsub = plane == 1 || plane == 2 ? b->hsub : 0; 277 int vsub = plane == 1 || plane == 2 ? b->vsub : 0; 278 int outw = FF_CEIL_RSHIFT(dst_buf->width, hsub); 279 int outh = FF_CEIL_RSHIFT(dst_buf->height, vsub); 280 FilterParams *param = &b->params[plane]; 281 ThreadData td = { .top = top_buf, .bottom = bottom_buf, .dst = dst_buf, 282 .w = outw, .h = outh, .param = param, .plane = plane, 283 .inlink = inlink }; 284 285 ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outh, ctx->graph->nb_threads)); 286 } 287 288 av_frame_free(&top_buf); 289 290 return dst_buf; 291} 292 293static av_cold int init(AVFilterContext *ctx) 294{ 295 BlendContext *b = ctx->priv; 296 int ret, plane; 297 298 for (plane = 0; plane < FF_ARRAY_ELEMS(b->params); plane++) { 299 FilterParams *param = &b->params[plane]; 300 301 if (b->all_mode >= 0) 302 param->mode = b->all_mode; 303 if (b->all_opacity < 1) 304 param->opacity = b->all_opacity; 305 306 switch (param->mode) { 307 case BLEND_ADDITION: param->blend = blend_addition; break; 308 case BLEND_AND: param->blend = blend_and; break; 309 case BLEND_AVERAGE: param->blend = blend_average; break; 310 case BLEND_BURN: param->blend = blend_burn; break; 311 case BLEND_DARKEN: param->blend = blend_darken; break; 312 case BLEND_DIFFERENCE: param->blend = blend_difference; break; 313 case BLEND_DIVIDE: param->blend = blend_divide; break; 314 case BLEND_DODGE: param->blend = blend_dodge; break; 315 case BLEND_EXCLUSION: param->blend = blend_exclusion; break; 316 case BLEND_HARDLIGHT: param->blend = blend_hardlight; break; 317 case BLEND_LIGHTEN: param->blend = blend_lighten; break; 318 case BLEND_MULTIPLY: param->blend = blend_multiply; break; 319 case BLEND_NEGATION: param->blend = blend_negation; break; 320 case BLEND_NORMAL: param->blend = blend_normal; break; 321 case BLEND_OR: param->blend = blend_or; break; 322 case BLEND_OVERLAY: param->blend = blend_overlay; break; 323 case BLEND_PHOENIX: param->blend = blend_phoenix; break; 324 case BLEND_PINLIGHT: param->blend = blend_pinlight; break; 325 case BLEND_REFLECT: param->blend = blend_reflect; break; 326 case BLEND_SCREEN: param->blend = blend_screen; break; 327 case BLEND_SOFTLIGHT: param->blend = blend_softlight; break; 328 case BLEND_SUBTRACT: param->blend = blend_subtract; break; 329 case BLEND_VIVIDLIGHT: param->blend = blend_vividlight; break; 330 case BLEND_XOR: param->blend = blend_xor; break; 331 } 332 333 if (b->all_expr && !param->expr_str) { 334 param->expr_str = av_strdup(b->all_expr); 335 if (!param->expr_str) 336 return AVERROR(ENOMEM); 337 } 338 if (param->expr_str) { 339 ret = av_expr_parse(¶m->e, param->expr_str, var_names, 340 NULL, NULL, NULL, NULL, 0, ctx); 341 if (ret < 0) 342 return ret; 343 param->blend = blend_expr; 344 } 345 } 346 347 b->dinput.process = blend_frame; 348 return 0; 349} 350 351static int query_formats(AVFilterContext *ctx) 352{ 353 static const enum AVPixelFormat pix_fmts[] = { 354 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, 355 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P, 356 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, 357 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE 358 }; 359 360 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); 361 return 0; 362} 363 364static int config_output(AVFilterLink *outlink) 365{ 366 AVFilterContext *ctx = outlink->src; 367 AVFilterLink *toplink = ctx->inputs[TOP]; 368 AVFilterLink *bottomlink = ctx->inputs[BOTTOM]; 369 BlendContext *b = ctx->priv; 370 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(toplink->format); 371 int ret; 372 373 if (toplink->format != bottomlink->format) { 374 av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n"); 375 return AVERROR(EINVAL); 376 } 377 if (toplink->w != bottomlink->w || 378 toplink->h != bottomlink->h || 379 toplink->sample_aspect_ratio.num != bottomlink->sample_aspect_ratio.num || 380 toplink->sample_aspect_ratio.den != bottomlink->sample_aspect_ratio.den) { 381 av_log(ctx, AV_LOG_ERROR, "First input link %s parameters " 382 "(size %dx%d, SAR %d:%d) do not match the corresponding " 383 "second input link %s parameters (%dx%d, SAR %d:%d)\n", 384 ctx->input_pads[TOP].name, toplink->w, toplink->h, 385 toplink->sample_aspect_ratio.num, 386 toplink->sample_aspect_ratio.den, 387 ctx->input_pads[BOTTOM].name, bottomlink->w, bottomlink->h, 388 bottomlink->sample_aspect_ratio.num, 389 bottomlink->sample_aspect_ratio.den); 390 return AVERROR(EINVAL); 391 } 392 393 outlink->w = toplink->w; 394 outlink->h = toplink->h; 395 outlink->time_base = toplink->time_base; 396 outlink->sample_aspect_ratio = toplink->sample_aspect_ratio; 397 outlink->frame_rate = toplink->frame_rate; 398 399 b->hsub = pix_desc->log2_chroma_w; 400 b->vsub = pix_desc->log2_chroma_h; 401 b->nb_planes = av_pix_fmt_count_planes(toplink->format); 402 403 if ((ret = ff_dualinput_init(ctx, &b->dinput)) < 0) 404 return ret; 405 406 return 0; 407} 408 409static av_cold void uninit(AVFilterContext *ctx) 410{ 411 BlendContext *b = ctx->priv; 412 int i; 413 414 ff_dualinput_uninit(&b->dinput); 415 for (i = 0; i < FF_ARRAY_ELEMS(b->params); i++) 416 av_expr_free(b->params[i].e); 417} 418 419static int request_frame(AVFilterLink *outlink) 420{ 421 BlendContext *b = outlink->src->priv; 422 return ff_dualinput_request_frame(&b->dinput, outlink); 423} 424 425static int filter_frame(AVFilterLink *inlink, AVFrame *buf) 426{ 427 BlendContext *b = inlink->dst->priv; 428 return ff_dualinput_filter_frame(&b->dinput, inlink, buf); 429} 430 431static const AVFilterPad blend_inputs[] = { 432 { 433 .name = "top", 434 .type = AVMEDIA_TYPE_VIDEO, 435 .filter_frame = filter_frame, 436 },{ 437 .name = "bottom", 438 .type = AVMEDIA_TYPE_VIDEO, 439 .filter_frame = filter_frame, 440 }, 441 { NULL } 442}; 443 444static const AVFilterPad blend_outputs[] = { 445 { 446 .name = "default", 447 .type = AVMEDIA_TYPE_VIDEO, 448 .config_props = config_output, 449 .request_frame = request_frame, 450 }, 451 { NULL } 452}; 453 454AVFilter ff_vf_blend = { 455 .name = "blend", 456 .description = NULL_IF_CONFIG_SMALL("Blend two video frames into each other."), 457 .init = init, 458 .uninit = uninit, 459 .priv_size = sizeof(BlendContext), 460 .query_formats = query_formats, 461 .inputs = blend_inputs, 462 .outputs = blend_outputs, 463 .priv_class = &blend_class, 464 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS, 465}; 466